/* roulang page: index */
:root {
            --primary: #1B6BF0;
            --primary-dark: #0E4FC0;
            --primary-light: #EAF1FE;
            --accent: #FF9A3E;
            --accent-light: #FFF2E5;
            --mint: #16B8A6;
            --mint-light: #E6FAF8;
            --bg: #F7FAFF;
            --card: #FFFFFF;
            --text: #0E1E3A;
            --text-body: #3E5068;
            --text-weak: #8A9BB0;
            --border: #E5EDF8;
            --radius-btn: 8px;
            --radius-badge: 999px;
            --radius-card: 14px;
            --radius-box: 20px;
            --shadow-card: 0 8px 24px rgba(18,50,100,.06);
            --shadow-hover: 0 16px 36px rgba(18,50,100,.12);
            --container: 1200px;
            --gap: 24px;
            --section-space: clamp(56px, 8vw, 96px);
        }
        *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-body);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }
        img { max-width: 100%; height: auto; display: block; border: 0; }
        a { color: var(--primary); text-decoration: none; transition: color .2s ease; }
        a:hover { color: var(--primary-dark); }
        button, input { font-family: inherit; font-size: 100%; line-height: 1.15; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4 { color: var(--text); font-weight: 700; line-height: 1.35; margin-bottom: .65em; }
        h1 { font-size: clamp(28px, 3.5vw, 42px); font-weight: 800; letter-spacing: -0.01em; }
        h2 { font-size: clamp(24px, 2.8vw, 34px); font-weight: 700; letter-spacing: -0.01em; }
        h3 { font-size: 20px; font-weight: 700; }
        p { margin-bottom: 1em; }
        .container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }
        .section { padding: var(--section-space) 0; }
        .section-alt { background: #FFFFFF; border-top: 1px solid #EDF3FA; border-bottom: 1px solid #EDF3FA; }
        .section-band { background: #EAF2FC; border-top: 1px solid #DCE8F5; border-bottom: 1px solid #DCE8F5; }
        .section-head { max-width: 640px; margin: 0 auto clamp(32px, 5vw, 56px); text-align: center; }
        .section-head .section-eyebrow { display: inline-block; padding: 4px 16px; background: var(--primary-light); color: var(--primary); border-radius: var(--radius-badge); font-size: 14px; font-weight: 600; margin-bottom: 12px; }
        .section-head h2 { margin-bottom: 10px; }
        .section-head p { color: var(--text-weak); font-size: 16px; }
        .btn {
            display: inline-flex; align-items: center; justify-content: center; gap: 8px;
            padding: 12px 28px; border-radius: var(--radius-btn); font-size: 15px; font-weight: 600;
            cursor: pointer; transition: all .25s ease; line-height: 1.5; white-space: nowrap;
            border: 2px solid transparent; text-align: center;
        }
        .btn i { font-size: 15px; }
        .btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 16px rgba(27,107,240,.28); }
        .btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 10px 22px rgba(27,107,240,.32); }
        .btn-secondary { background: transparent; color: var(--primary); border-color: var(--primary); }
        .btn-secondary:hover { background: var(--primary-light); color: var(--primary-dark); border-color: var(--primary-dark); transform: translateY(-2px); }
        .btn-accent { background: var(--accent); color: #fff; box-shadow: 0 6px 16px rgba(255,154,62,.30); }
        .btn-accent:hover { background: #E8840F; color: #fff; transform: translateY(-2px); box-shadow: 0 10px 22px rgba(255,154,62,.34); }
        .btn-lg { padding: 15px 36px; font-size: 17px; }
        .btn:focus-visible { outline: 3px solid rgba(27,107,240,.35); outline-offset: 2px; }
        .badge {
            display: inline-flex; align-items: center; gap: 5px;
            padding: 3px 12px; border-radius: var(--radius-badge); font-size: 13px; font-weight: 500; line-height: 1.6;
        }
        .badge-blue { background: var(--primary-light); color: var(--primary); }
        .badge-orange { background: var(--accent-light); color: #D9730F; }
        .badge-green { background: var(--mint-light); color: #0E8F80; }
        .badge-gray { background: #EFF2F7; color: var(--text-weak); }

        .header {
            position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,.97);
            border-bottom: 1px solid var(--border); box-shadow: 0 2px 12px rgba(20,50,90,.05);
            backdrop-filter: saturate(180%) blur(8px);
        }
        .header-inner { display: flex; align-items: center; height: 64px; gap: 28px; }
        .logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
        .logo-icon {
            width: 32px; height: 32px; border-radius: 9px;
            background: linear-gradient(135deg, var(--primary), #4A8EF7);
            display: flex; align-items: center; justify-content: center;
            color: #fff; font-size: 17px; box-shadow: 0 4px 10px rgba(27,107,240,.25);
        }
        .logo-text { font-size: 18px; font-weight: 800; color: var(--text); letter-spacing: -0.01em; white-space: nowrap; }
        .logo-text span { color: var(--primary); }
        .header-nav { display: flex; align-items: center; gap: 4px; margin-left: 12px; }
        .header-nav a {
            display: block; padding: 8px 16px; border-radius: var(--radius-btn);
            font-size: 15px; font-weight: 500; color: var(--text-body);
            position: relative; transition: background .2s, color .2s;
        }
        .header-nav a:hover { background: var(--primary-light); color: var(--primary); }
        .header-nav a.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }
        .header-actions { margin-left: auto; display: flex; align-items: center; gap: 14px; }
        .header-search { position: relative; width: 220px; }
        .header-search input {
            width: 100%; height: 40px; border-radius: var(--radius-badge);
            background: #F2F5FA; border: 1px solid transparent;
            padding: 0 16px 0 38px; font-size: 14px; color: var(--text);
            transition: border-color .25s, background .25s;
        }
        .header-search input::placeholder { color: var(--text-weak); }
        .header-search input:focus {
            outline: none; background: #fff; border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(27,107,240,.12);
        }
        .header-search .search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--text-weak); font-size: 14px; pointer-events: none; }
        .menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; width: 40px; height: 40px; align-items: center; justify-content: center; cursor: pointer; border-radius: var(--radius-btn); transition: background .2s; }
        .menu-toggle:hover { background: var(--primary-light); }
        .menu-toggle span { display: block; width: 20px; height: 2px; background: var(--text); border-radius: 2px; transition: transform .3s, opacity .3s; }

        @media (max-width: 1080px) {
            .header-nav { display: none; }
            .header-actions .header-search { display: none; }
            .menu-toggle { display: flex; }
            .header-nav.open { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: #fff; padding: 12px 20px 16px; border-bottom: 1px solid var(--border); box-shadow: 0 8px 20px rgba(20,50,90,.08); gap: 2px; align-items: stretch; }
            .header-nav.open a { padding: 12px 16px; font-size: 16px; }
            .header-actions { gap: 8px; }
        }

        .hero{
            position:relative;
            background: linear-gradient(135deg, #E9F2FE 0%, #F7FBFF 55%, #EEF7F5 100%);
            padding: clamp(56px, 7vw, 88px) 0;
            overflow:hidden;
        }
        .hero::before{
            content:''; position:absolute; inset:0; z-index:0;
            background-image:url('/assets/images/backpic/back-1.png');
            background-size:cover; background-position:center;
            opacity:.09;
        }
        .hero .container{ position:relative; z-index:2; display:grid; grid-template-columns:1fr 1fr; align-items:center; gap:48px; }
        .hero-tag{ display:inline-flex; align-items:center; gap:8px; background:#fff; border:1px solid var(--border); padding:5px 16px; border-radius:var(--radius-badge); font-size:13px; color:var(--text-body); margin-bottom:20px; box-shadow:0 2px 8px rgba(18,50,100,.05); }
        .hero-tag .dot{ width:8px; height:8px; border-radius:50%; background:var(--mint); display:inline-block; flex-shrink:0; }
        .hero-content h1{ margin-bottom:18px; letter-spacing:-0.015em; line-height:1.3; }
        .hero-subtitle{ font-size:17px; color:var(--text-body); margin-bottom:28px; max-width:520px; line-height:1.85; }
        .hero-actions{ display:flex; flex-wrap:wrap; gap:14px; margin-bottom:24px; }
        .hero-mini-stats{ display:flex; flex-wrap:wrap; gap:8px; }
        .hero-visual{ position:relative; }
        .hero-screen-wrap{
            background: #fff; border-radius: var(--radius-box); padding: 14px;
            box-shadow: var(--shadow-hover); border: 1px solid var(--border); transform: perspective(1000px) rotateY(-4deg);
        }
        .hero-screen{ border-radius: 12px; overflow:hidden; background:#fff; border:1px solid #eef2f6; }
        .hero-screen-top{ display:flex; align-items:center; gap:5px; padding:10px 14px; border-bottom:1px solid #f0f4f8; }
        .hero-screen-top i{ width:10px; height:10px; border-radius:50%; display:inline-block; }
        .hero-screen-top .c-red{ background:#FF5F57; } .hero-screen-top .c-yellow{ background:#FEBC2E; } .hero-screen-top .c-green{ background:#28C840; }
        .hero-screen img{ width:100%; height:auto; }

        .value-grid{ display:grid; grid-template-columns:1.15fr .85fr; gap:var(--gap); align-items:stretch; }
        .value-main {
            background: var(--card); border:1px solid var(--border); border-radius: var(--radius-box);
            padding: clamp(28px, 4vw, 48px); box-shadow: var(--shadow-card); position:relative; overflow:hidden;
            display:flex; flex-direction:column; justify-content:center;
        }
        .value-main-bg{ position:absolute; right:-30px; bottom:-30px; opacity:.05; font-size:130px; pointer-events:none; }
        .value-main h2{ margin-bottom:18px; }
        .value-main p{ color:var(--text-body); font-size:16px; }
        .value-main-list{ margin-top:24px; display:grid; gap:16px; }
        .value-item{ display:flex; align-items:flex-start; gap:14px; }
        .value-item-icon{ width:44px; height:44px; border-radius:12px; display:flex; align-items:center; justify-content:center; flex-shrink:0; font-size:20px; }
        .value-item-icon.vi1{ background:var(--primary-light); color:var(--primary); }
        .value-item-icon.vi2{ background:var(--accent-light); color:var(--accent); }
        .value-item-icon.vi3{ background:var(--mint-light); color:var(--mint); }
        .value-item .vi-title{ font-weight:700; color:var(--text); font-size:16px; }
        .value-item .vi-desc{ font-size:14px; color:var(--text-weak); line-height:1.7; }
        .value-side{ display:grid; grid-template-rows:1fr 1fr; gap:var(--gap); }
        .value-card{
            background: var(--card); border:1px solid var(--border); border-radius: var(--radius-card);
            padding: 28px; box-shadow: var(--shadow-card); display:flex; flex-direction:column; justify-content:center;
            transition: box-shadow .3s ease, transform .3s ease;
        }
        .value-card:hover{ box-shadow: var(--shadow-hover); transform: translateY(-4px); }
        .value-card h3{ font-size:18px; font-weight:700; display:flex; align-items:center; gap:10px; }
        .value-card h3 i{ color:var(--primary); }
        .value-card p{ font-size:13px; color:var(--weak,#8A9BB0); line-height:1.6; margin-bottom:14px; }
        .value-card ul{ display:grid; gap:8px; margin-top:8px; }
        .value-card ul li{ font-size:14px; color:var(--text-body); display:flex; gap:8px; align-items:center; }
        .value-card ul li i{ color:var(--accent); font-size:13px; }

        .showcase{ }
        .showcase-slider{ position:relative; }
        .showcase-track{ overflow:hidden; border-radius: var(--radius-box); }
        .showcase-window{
            display:grid; grid-template-columns:repeat(3, 100%); gap:0;
            transition: transform .5s cubic-bezier(.4,0,.2,1);
        }
        .showcase-slide{ padding:0 12px; }
        .slide-card{
            border-radius: var(--radius-box); overflow:hidden; background:#fff; border:1px solid var(--border);
            box-shadow: var(--shadow-card);
        }
        .slide-cover{ position:relative; overflow:hidden; }
        .slide-cover img{ width:100%; aspect-ratio:16/9; object-fit:cover; transition: transform .6s ease; }
        .slide-card:hover .slide-cover img{ transform: scale(1.04); }
        .slide-cover-label{
            position:absolute; left:16px; bottom:16px; background:rgba(14,30,58,.85); color:#fff;
            padding:6px 18px; border-radius:var(--radius-badge); font-size:14px; font-weight:600;
            backdrop-filter: blur(6px);
        }
        .slide-caption{ padding:18px 20px; }
        .slide-caption h3{ font-size:17px; margin-bottom:6px; }
        .slide-caption p{ font-size:14px; color:var(--text-weak); }
        .showcase-controls{ display:flex; align-items:center; justify-content:center; gap:24px; margin-top:24px; }
        .showcase-dots{ display:flex; gap:8px; }
        .showcase-dots button{
            width:8px; height:8px; border-radius:50%; background:#C7D2E0;
            transition: background .3s, transform .3s; cursor:pointer; padding:0;
        }
        .showcase-dots button.active{ background:var(--primary); transform: scale(1.4); }
        .showcase-arrow{
            width:44px; height:44px; border-radius:50%; background:#fff; border:1px solid var(--border);
            display:flex; align-items:center; justify-content:center; cursor:pointer; transition: all .25s;
            box-shadow: 0 4px 12px rgba(18,50,100,.08);
        }
        .showcase-arrow i{ color:var(--text-body); font-size:18px; }
        .showcase-arrow:hover{ background: var(--primary); border-color: var(--primary); box-shadow: 0 6px 16px rgba(27,107,240,.30); }
        .showcase-arrow:hover i{ color:#fff; }

        .requirements-grid{ display:grid; grid-template-columns:1fr 1fr; gap:var(--gap); }
        .requirement-card{
            background:var(--card); border:1px solid var(--border); border-radius: var(--radius-box);
            padding: clamp(24px, 3.5vw, 40px); box-shadow: var(--shadow-card);
        }
        .requirement-card h3{ font-size:20px; font-weight:700; display:flex; align-items:center; gap:12px; margin-bottom:22px; }
        .requirement-card .rc-icon{ width:44px; height:44px; border-radius:12px; display:flex; align-items:center; justify-content:center; font-size:19px; }
        .rc-android .rc-icon{ background: var(--mint-light); color: var(--mint); }
        .rc-pc .rc-icon{ background: var(--primary-light); color: var(--primary); }
        .spec-list{ display:grid; gap:10px; }
        .spec-row{ display:flex; align-items:center; justify-content:space-between; padding:12px 18px; background:var(--bg); border-radius:10px; font-size:14px; }
        .spec-label{ color:var(--text-weak); display:flex; gap:8px; }
        .spec-label i{ width:18px; color:var(--primary); }
        .spec-value{ color:var(--text); font-weight:600; text-align:right; }

        .reviews-grid{ display:grid; grid-template-columns:repeat(3, 1fr); gap:var(--gap); }
        .review-card{
            background:var(--card); border:1px solid var(--border); border-radius:var(--radius-card);
            padding:28px; box-shadow:var(--shadow-card); transition: box-shadow .3s, transform .3s;
            display:flex; flex-direction:column;
        }
        .review-card:hover{ box-shadow: var(--shadow-hover); transform: translateY(-4px); }
        .review-card.featured{ grid-column:span 1; background:linear-gradient(160deg, #EAF1FE, #F9FBFF); border-color:#D0E1F8; }
        .review-stars{ display:flex; gap:3px; color:var(--accent); font-size:15px; margin-bottom:16px; }
        .review-text{ font-size:15px; line-height:1.8; flex:1; color:var(--text); margin-bottom:16px; }
        .review-user{ display:flex; align-items:center; gap:12px; }
        .avatar{
            width:42px; height:42px; border-radius:50%; background:var(--primary-light);
            color: var(--primary); display:flex; align-items:center; justify-content:center;
            font-weight:700; font-size:15px; flex-shrink:0;
        }
        .avatar-a[data-color="2"]{ background:var(--accent-light); color:#D9730F; }
        .review-user-info .name{ font-size:14px; font-weight:600; color:var(--text); }
        .review-user-info .role{ font-size:12px; color:var(--text-weak); }

        .faq-grid{ max-width:850px; margin:0 auto; display:grid; gap:14px; }
        .faq-item{
            background:var(--card); border:1px solid var(--border); border-radius: var(--radius-card);
            overflow:hidden; transition: box-shadow .3s, border-color .3s;
        }
        .faq-item[open]{ box-shadow: var(--shadow-card); border-color: #CBD9F5; }
        .faq-item summary{
            padding: 20px 28px; display:flex; align-items:center; cursor:pointer; user-select:none;
            font-weight:600; font-size:16px; color:var(--text); list-style:none; transition: background .2s;
        }
        .faq-item summary::-webkit-details-marker{ display:none; }
        .faq-item summary:hover{ background: #F9FBFE; }
        .faq-item summary .faq-icon{ margin-left:auto; color: var(--primary); font-size:18px; transition: transform .3s; width:24px; text-align:center; flex-shrink:0; }
        .faq-item[open] summary .faq-icon{ transform: rotate(135deg); }
        .faq-item .faq-answer{ padding:0 28px 26px; font-size:15px; color:var(--text-body); border-top:1px dashed #EDF2F8; margin-top:0; padding-top:16px; }

        .download-band{
            background: linear-gradient(150deg, #10233F, #16375F);
            border-radius: var(--radius-box); padding: clamp(32px, 5vw, 56px);
            display:flex; align-items:center; gap:32px; position:relative; overflow:hidden;
            justify-content:space-between; flex-wrap:wrap;
        }
        .download-band::after{
            content:''; position:absolute; width:260px; height:260px; border-radius:50%;
            border: 30px solid rgba(255,154,62,.16); right:-60px; bottom:-60px;
        }
        .band-left{ flex:1 1 320px; }
        .band-left h2{ color:#fff; margin-bottom:10px; }
        .band-left p{ color:#B6C9E0; font-size:15px; }
        .band-qr{
            width:120px; height:120px; background:#fff; border-radius:12px; flex-shrink:0;
            display:flex; align-items:center; justify-content:center; padding:10px;
        }
        .band-qr img{ width:100%; height:auto; }
        .band-right{ display:flex; flex-direction:column; gap:14px; flex-shrink:0; }
        @media(max-width:768px){
            .band-right{ flex-direction:row; flex-wrap:wrap; }
        }
        .gameplatform-band{
            background:#0E1E3A; color:#fff; border-radius:16px;
            padding: 32px; display:flex; align-items:center; gap:28px;
        }
        .footer {
            background: #10233F; color: #AEBFD8; padding: clamp(48px, 6vw, 72px) 0 0; margin-top: 0;
        }
        .footer-main{ display:grid; grid-template-columns:1.6fr 1fr 1fr 1fr; gap:40px; padding-bottom:44px; }
        .footer-brand{ max-width: 330px; }
        .footer-brand .logo{ margin-bottom:14px; }
        .footer-brand .logo-text{ color:#fff; line-height:1.3; white-space: normal; }
        .footer-brand p{  font-size: 14px; line-height: 1.8; }
        .footer-links h4{ color:#fff; font-size:16px; margin-bottom:14px; }
        .footer-links ul li{ margin-bottom:9px; }
        .footer-links ul li a{ color:#AEBFD8; font-size:14px; transition: color .2s; }
        .footer-links ul li a:hover{ color:#fff; }
        .footer-bottom{
            border-top: 1px solid rgba(255,255,255,.1); padding: 22px 0;
            font-size:13px; color: #758FAE; display:flex; flex-wrap:wrap; align-items:center;
            justify-content:space-between; gap:10px;
        }
        @media(max-width: 768px) {
            .footer-main{ grid-template-columns:1fr 1fr; gap:28px; }
            .footer-brand{ grid-column: span 2; }
        }
        @media(max-width: 480px) {
            .footer-main{ grid-template-columns:1fr; }
            .footer-brand{ grid-column:span 1; }
        }
        .hero, .section, .footer { }
        .hero ~ .section:first-of-type { padding-top: var(--section-space); }

        .game-gallery{ display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-top:24px; }
        .game-gallery-item{ position:relative; border-radius:var(--radius-card); overflow:hidden; }
        .game-gallery-item img{ width:100%; height:100%; object-fit:cover; }
        .game-gallery-item .g-overlay{
            position:absolute; inset:auto 0 0 0; padding:36px 20px 16px;
            background:linear-gradient(0deg, rgba(14,30,58,.65), transparent); color:#fff;
            font-size:15px; font-weight:600;
        }

        .news-section{ }
        .news-layout{ display:grid; grid-template-columns:.8fr 1.8fr; gap:var(--gap); align-items:start; }
        .news-side{ display:flex; flex-direction:column; gap:20px; position:sticky; top:88px; }
        .news-side-card{ background:var(--card); border:1px solid var(--border); border-radius:var(--radius-card); padding:24px; box-shadow:var(--shadow-card); }
        .news-side-card h3{ font-size:18px; margin-bottom:14px; }
        .news-side-card p{ font-size:14px; color:var(--text-weak); line-height:1.7; }
        .channel-anchor{ display:grid; gap:10px; margin-top:8px; }
        .channel-anchor a{
            display:flex; align-items:center; gap:12px; padding:12px 14px; border-radius:10px;
            background:#F5F8FD; color:var(--text-body); font-size:14px; transition: background .2s, transform .2s;
        }
        .channel-anchor a i{ color: var(--primary); width:20px; text-align:center; }
        .channel-anchor a:hover{ background: var(--primary-light); color: var(--primary); transform: translateX(4px); }
        .news-list{ display:flex; flex-direction:column; gap:14px; }
        .news-card{
            display:flex; gap:18px; padding:20px; background:var(--card);
            border:1px solid var(--border); border-radius:var(--radius-card);
            box-shadow:var(--shadow-card); transition: box-shadow .3s, transform .3s; cursor:pointer;
        }
        .news-card:hover{ box-shadow: var(--shadow-hover); transform: translateY(-3px); }
        .news-thumb{ width:150px; height:100px; border-radius:10px; overflow:hidden; flex-shrink:0; }
        .news-thumb img{ width:100%; height:100%; object-fit:cover; }
        .news-info{ flex:1; display:flex; flex-direction:column; justify-content:center; min-width:0; }
        .news-title{ color: var(--text); font-size:17px; font-weight:600; line-height:1.6; transition: color .2s; display:block; }
        .news-title:hover{ color: var(--primary); }
        .news-meta{ display:flex; gap:8px; flex-wrap:wrap; margin-top:6px; }
        .news-exceprt{ color:var(--text-weak); font-size:14px; margin-top:8px; line-height:1.65; }
        .empty-state{ text-align:center; padding:48px 20px; color:var(--text-weak); font-size:15px; }
        @media(max-width: 768px){
            .value-grid, .news-layout, .requirements-grid, .reviews-grid{ grid-template-columns:1fr; }
            .hero .container{ grid-template-columns:1fr; }
            .hero-visual{ order:-1; margin-bottom:8px; }
            .news-side{ position:static; }
            .news-card{ flex-direction:column; }
            .news-thumb{ width:100%; height:auto; aspect-ratio:16/9; }
            .value-side{ grid-template-columns:1fr; }
            .faq-item summary{ padding:16px 20px; font-size:15px; }
            .faq-item .faq-answer{ padding:12px 20px 20px; }
        }
        .back-to-top{
            position:fixed; right:24px; bottom:24px; width:44px; height:44px; border-radius:50%;
            background:var(--primary); color:#fff; font-size:18px; display:flex;
            align-items:center; justify-content:center; cursor:pointer; box-shadow:0 4px 12px rgba(27,107,240,.4);
            opacity:0; visibility:hidden; transition:all .4s; z-index:90;
        }
        .back-to-top.show{ opacity:1; visibility:visible; }

/* roulang page: category1 */
:root {
  --bg: #F4F8FD;
  --card: #FFFFFF;
  --surface: #EAF2FC;
  --primary: #1B6BF0;
  --primary-dark: #0E4FC0;
  --accent: #FF9A3E;
  --accent-dark: #E87E1F;
  --mint: #16B8A6;
  --text: #0E1E3A;
  --muted: #3E5068;
  --light: #8A9BB0;
  --border: #E5EDF8;
  --shadow: 0 8px 24px rgba(18, 50, 100, .06);
  --shadow-hover: 0 16px 36px rgba(18, 50, 100, .12);
  --radius: 14px;
  --radius-lg: 20px;
  --container: 1200px;
  --space: clamp(56px, 8vw, 96px);
  font-size: 16px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color .2s ease;
}

img {
  max-width: 100%;
  display: block;
  border: 0;
}

button,
input {
  font: inherit;
  outline: none;
}

ul,
ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 8px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all .25s ease;
  white-space: nowrap;
  padding: 12px 24px;
  font-size: 15px;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(27, 107, 240, .22);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: #CED9E8;
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(27, 107, 240, .04);
}

.btn-accent {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-accent:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(255, 154, 62, .25);
}

.btn-light {
  background: #fff;
  color: var(--text);
  border-color: #fff;
}

.btn-light:hover {
  background: var(--surface);
  border-color: var(--surface);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(255, 255, 255, .15);
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 42px;
}

.eyebrow {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 999px;
  background: rgba(27, 107, 240, .08);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .2px;
  margin-bottom: 14px;
}

.section-head h2 {
  font-size: clamp(24px, 2.8vw, 34px);
  line-height: 1.35;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}

.section-head p {
  color: var(--muted);
  font-size: 16px;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 18px rgba(18, 50, 100, .03);
}

.header-inner {
  height: 64px;
  display: flex;
  align-items: center;
  gap: 26px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex-shrink: 0;
}

.logo-icon {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), #55A0FF);
  color: #fff;
  border-radius: 9px;
  font-size: 17px;
  box-shadow: 0 6px 14px rgba(27, 107, 240, .28);
}

.logo-text {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: .3px;
}

.logo-text span {
  color: var(--primary);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 8px;
}

.header-nav a {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 11px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--muted);
  position: relative;
}

.header-nav a:hover {
  color: var(--primary);
  background: rgba(27, 107, 240, .05);
}

.header-nav a.active {
  color: var(--primary);
  font-weight: 600;
  background: rgba(27, 107, 240, .07);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.header-search {
  display: flex;
  align-items: center;
  width: 230px;
  height: 40px;
  background: #F2F5FA;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0 15px;
  gap: 8px;
  transition: all .2s ease;
}

.header-search:focus-within {
  border-color: rgba(27, 107, 240, .35);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(27, 107, 240, .08);
}

.header-search .search-icon {
  color: var(--light);
  font-size: 14px;
}

.header-search input {
  background: transparent;
  border: 0;
  width: 100%;
  font-size: 14px;
  color: var(--text);
}

.header-search input::placeholder {
  color: #AFBCCC;
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 0;
  background: #F2F5FA;
  border-radius: 10px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.menu-toggle span {
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 4px;
  transition: all .25s ease;
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Page Banner */
.category-banner {
  background: linear-gradient(100deg, #FFFFFF 0%, #F1F7FE 45%, #E5EFFC 100%), url("/assets/images/backpic/back-2.png");
  background-size: cover;
  background-position: center;
  border-bottom: 1px solid var(--border);
  padding: clamp(42px, 7vw, 74px) 0;
  position: relative;
}

.category-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(255, 255, 255, .78) 10%, rgba(255, 255, 255, .35) 55%, rgba(255, 255, 255, .18) 100%);
  pointer-events: none;
}

.banner-content {
  position: relative;
  z-index: 2;
  max-width: 860px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--light);
  margin-bottom: 18px;
}

.breadcrumb a {
  color: var(--light);
}

.breadcrumb a:hover {
  color: var(--primary);
}

.breadcrumb i {
  font-size: 12px;
  color: #C2CFDF;
}

.category-banner h1 {
  font-size: clamp(28px, 3.5vw, 42px);
  line-height: 1.3;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 12px;
}

.banner-sub {
  max-width: 620px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

.banner-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.banner-chips span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  background: rgba(255, 255, 255, .92);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
  box-shadow: 0 4px 12px rgba(18, 50, 100, .04);
}

.banner-chips i {
  color: var(--accent);
}

/* Section common */
.section {
  padding: var(--space) 0;
  position: relative;
}

.section-alt {
  background: #F9FBFF;
}

/* Feature section */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow);
  transition: all .3s ease;
}

.feature-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 18px;
}

.feature-icon.blue {
  background: rgba(27, 107, 240, .1);
  color: var(--primary);
}

.feature-icon.orange {
  background: rgba(255, 154, 62, .12);
  color: var(--accent-dark);
}

.feature-icon.green {
  background: rgba(22, 184, 166, .12);
  color: var(--mint);
}

.feature-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--muted);
  font-size: 15px;
}

/* Aside main layout */
.side-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  align-items: start;
}

.card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.main-section-title {
  font-size: clamp(24px, 2.8vw, 32px);
  line-height: 1.4;
  font-weight: 700;
  margin-bottom: 10px;
}

.section-desc {
  color: var(--muted);
  margin-bottom: 24px;
}

.featured-card {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
  transition: box-shadow .25s ease, transform .25s ease;
}

.featured-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.featured-card .featured-img {
  min-height: 260px;
}

.featured-card .featured-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.featured-content {
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.lang-tag {
  align-self: flex-start;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(255, 154, 62, .12);
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
}

.featured-content h3 {
  font-size: 22px;
  line-height: 1.4;
  font-weight: 700;
  margin-bottom: 10px;
}

.featured-content p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag-row .tag {
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-size: 12px;
  font-weight: 500;
}

.virtual-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 22px;
}

.virtual-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px;
  transition: all .25s ease;
  box-shadow: var(--shadow);
}

.virtual-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.virtual-img {
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 14px;
}

.virtual-img img {
  width: 100%;
  height: 170px;
  object-fit: cover;
  transition: transform .35s ease;
}

.virtual-card:hover .virtual-img img {
  transform: scale(1.04);
}

.virtual-card .tag-green {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(22, 184, 166, .1);
  color: var(--mint);
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 8px;
}

.virtual-card .tag-blue {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(27, 107, 240, .09);
  color: var(--primary);
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 8px;
}

.virtual-card .tag-orange {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(255, 154, 62, .1);
  color: var(--accent-dark);
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 8px;
}

.virtual-card .tag-purple {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(118, 100, 222, .1);
  color: #6A5AE0;
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 8px;
}

.virtual-card h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.virtual-card p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

/* Aside */
.side-panel {
  display: grid;
  gap: 18px;
}

.side-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
}

.side-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.side-card h3 i {
  color: var(--primary);
}

.side-links li + li {
  border-top: 1px dashed #E5EDF8;
}

.side-links a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 0;
  color: var(--muted);
  font-size: 14px;
}

.side-links a:hover {
  color: var(--primary);
}

.side-links a i {
  width: 22px;
  color: var(--light);
  font-size: 13px;
}

.download-tips li {
  display: flex;
  gap: 10px;
  padding: 8px 0;
  font-size: 14px;
  color: var(--muted);
  align-items: flex-start;
}

.download-tips li i {
  color: var(--mint);
  margin-top: 5px;
  font-size: 13px;
}

.notice-box {
  background: #F7FAFF;
  border-radius: 12px;
  padding: 15px 16px;
  font-size: 13px;
  color: var(--light);
  border: 1px solid #E9F0FA;
  margin-top: 8px;
  line-height: 1.7;
}

/* Process */
.process-wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  margin-top: 10px;
}

.process-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  position: relative;
  transition: all .25s ease;
}

.process-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.step-num {
  display: inline-flex;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: rgba(27, 107, 240, .08);
  color: var(--primary);
  font-weight: 800;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  margin-bottom: 16px;
}

.process-item h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.process-item p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
}

/* Spec section */
.req-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.req-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.req-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, #F5FAFF, #EFF5FD);
}

.req-head i {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.req-head span {
  font-size: 18px;
  font-weight: 700;
}

.req-list {
  padding: 6px 24px 16px;
}

.req-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 0;
  border-bottom: 1px dashed #E5EDF8;
  font-size: 14px;
}

.req-list li:last-child {
  border-bottom: 0;
}

.req-list li span {
  color: var(--light);
  flex-shrink: 0;
}

.req-list li strong {
  color: var(--text);
  font-weight: 600;
  text-align: right;
}

/* FAQ */
.faq-wrap {
  max-width: 880px;
  margin: 0 auto;
}

.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: border-color .2s ease;
}

.faq-item[open] {
  border-color: rgba(27, 107, 240, .25);
}

.faq-item summary {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 22px;
  font-weight: 600;
  color: var(--text);
  font-size: 16px;
  list-style: none;
  user-select: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "\f067";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  color: var(--light);
  font-size: 13px;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #F2F6FB;
  border-radius: 50%;
  flex-shrink: 0;
  transition: all .25s ease;
}

.faq-item[open] summary::after {
  content: "\f068";
  color: var(--primary);
  background: rgba(27, 107, 240, .09);
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

/* CTA */
.cta-band {
  background: #10233F;
  background-image: linear-gradient(135deg, #0A1A33, #142F56);
  color: #fff;
  padding: clamp(52px, 7vw, 80px) 0;
}

.cta-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
}

.cta-title {
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.4;
  font-weight: 700;
  margin-bottom: 12px;
}

.cta-title span {
  color: var(--accent);
}

.cta-desc {
  color: #B8C9E0;
  font-size: 16px;
  max-width: 620px;
  line-height: 1.8;
}

.cta-actions {
  display: flex;
  gap: 14px;
  flex-shrink: 0;
  flex-wrap: wrap;
}

/* Footer */
.footer {
  background: #10233F;
  color: #D5E1F0;
  padding: 60px 0 0;
  font-size: 14px;
}

.footer-main {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 42px;
}

.footer-brand .logo {
  color: #fff;
  margin-bottom: 14px;
}

.footer-brand .logo-text {
  color: #fff;
}

.footer-brand .logo-text span {
  color: #6FA8FF;
}

.footer-brand p {
  max-width: 300px;
  color: #9FB3CB;
  line-height: 1.8;
  margin-top: 12px;
  font-size: 14px;
}

.footer-links h4 {
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: #9FB3CB;
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .1);
  padding: 18px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  color: #7890AA;
  font-size: 13px;
  flex-wrap: wrap;
}

/* Scroll */
main section {
  scroll-margin-top: 80px;
}

/* Responsive */
@media (max-width: 1180px) {
  .header-nav a {
    padding: 0 8px;
    font-size: 14px;
  }

  .header-search {
    width: 180px;
  }
}

@media (max-width: 1024px) {
  .header-nav {
    position: fixed;
    top: 64px;
    left: 0;
    width: 100%;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 10px 20px 16px;
    gap: 2px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 14px 24px rgba(18, 50, 100, .08);
    transform: translateY(-16px);
    opacity: 0;
    pointer-events: none;
    transition: all .24s ease;
    display: flex;
  }

  .header-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .header-nav a {
    height: 46px;
    border-radius: 8px;
    justify-content: flex-start;
    padding: 0 14px;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .header-actions .header-search {
    display: none;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .process-wrap {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 860px) {
  .side-layout {
    grid-template-columns: 1fr;
  }

  .virtual-grid {
    grid-template-columns: 1fr;
  }

  .featured-card {
    grid-template-columns: 1fr;
  }

  .featured-card .featured-img {
    min-height: 220px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 56px;
    gap: 12px;
  }

  .header-actions .btn {
    display: none;
  }

  .header-nav {
    top: 56px;
  }

  .logo-text {
    font-size: 18px;
  }

  .req-grid,
  .cta-wrap {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: flex-start;
  }

  .category-banner {
    padding: 40px 0;
  }

  .banner-sub {
    font-size: 15px;
  }

  .cta-actions {
    flex-direction: column;
    width: 100%;
  }

  .cta-actions .btn {
    width: 100%;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 520px) {
  .btn {
    padding: 10px 18px;
  }

  .process-wrap {
    grid-template-columns: 1fr;
  }

  .virtual-img img {
    height: 150px;
  }

  .req-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .req-list li strong {
    text-align: left;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* roulang page: article */
:root {
            --primary: #1663DC;
            --primary-dark: #0E4FC0;
            --primary-soft: #EAF1FE;
            --accent: #FF9A3E;
            --accent-dark: #ED8B2B;
            --mint: #16B8A6;
            --bg: #F4F8FD;
            --card: #FFFFFF;
            --surface: #FFFFFF;
            --title: #0E1E3A;
            --text: #41536A;
            --muted: #8A9BB0;
            --border: #E5EDF8;
            --divider: #EEF3F9;
            --radius: 14px;
            --radius-lg: 20px;
            --shadow-sm: 0 6px 18px rgba(18, 50, 100, .05);
            --shadow-md: 0 10px 30px rgba(18, 50, 100, .08);
            --transition: .25s ease;
        }
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background: var(--bg);
            color: var(--text);
            font-size: 16px;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        body.nav-open {
            overflow: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        img {
            max-width: 100%;
            display: block;
        }
        ul, ol {
            list-style: none;
        }
        button, input {
            font-family: inherit;
            border: none;
            outline: none;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        a:focus-visible, button:focus-visible {
            outline: 3px solid rgba(22, 99, 220, .32);
            outline-offset: 2px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 11px 22px;
            border-radius: 10px;
            font-size: 15px;
            font-weight: 700;
            line-height: 1;
            cursor: pointer;
            transition: background .25s ease, transform .25s ease, box-shadow .25s ease;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 8px 18px rgba(22, 99, 220, .18);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 12px 24px rgba(22, 99, 220, .22);
        }
        .btn-warm {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 8px 18px rgba(255, 154, 62, .25);
        }
        .btn-warm:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 12px 24px rgba(255, 154, 62, .28);
        }

        /* ===== Header ===== */
        .header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, .96);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 4px 18px rgba(18, 50, 100, .04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            height: 64px;
            gap: 12px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 34px;
            height: 34px;
            background: var(--primary);
            color: #fff;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 17px;
            box-shadow: 0 6px 14px rgba(22, 99, 220, .22);
        }
        .logo-text {
            font-size: 20px;
            font-weight: 800;
            color: var(--title);
            white-space: nowrap;
            letter-spacing: -.2px;
        }
        .logo-text span {
            color: var(--primary);
        }
        .header-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            margin-left: 22px;
        }
        .header-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            border-radius: 999px;
            font-weight: 600;
            font-size: 15px;
            color: var(--text);
            transition: background .2s ease, color .2s ease;
        }
        .header-nav a:hover {
            background: #F2F6FC;
            color: var(--primary);
        }
        .header-nav a.active {
            background: var(--primary-soft);
            color: var(--primary);
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-left: auto;
        }
        .header-search {
            position: relative;
            width: 220px;
        }
        .search-icon {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 13px;
            color: #A7B2C3;
            pointer-events: none;
        }
        .header-search input {
            width: 100%;
            height: 38px;
            border-radius: 999px;
            background: #F2F5FA;
            border: 1px solid transparent;
            padding: 0 16px 0 36px;
            font-size: 14px;
            color: var(--title);
            transition: background .2s ease, border-color .2s ease, box-shadow .2s ease;
        }
        .header-search input::placeholder {
            color: #A7B2C3;
        }
        .header-search input:focus {
            background: #fff;
            border-color: var(--primary);
            box-shadow: 0 0 0 4px rgba(22, 99, 220, .1);
        }
        .menu-toggle {
            display: none;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: 5px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 10px;
            cursor: pointer;
            transition: background .2s ease;
        }
        .menu-toggle:hover {
            background: #F5F8FC;
        }
        .menu-toggle span {
            width: 18px;
            height: 2px;
            background: var(--title);
            border-radius: 2px;
        }

        /* ===== 文章内容区 ===== */
        .article-wrap {
            max-width: 880px;
            margin: 0 auto;
            padding: 36px 0 40px;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 6px;
            font-size: 14px;
            color: var(--muted);
            margin-bottom: 18px;
        }
        .breadcrumb a {
            color: var(--muted);
            transition: color .2s ease;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: #C4CFDE;
        }
        .breadcrumb .bc-cat,
        .breadcrumb .bc-current {
            max-width: 260px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .breadcrumb .bc-current {
            color: var(--primary);
            font-weight: 600;
        }
        .article-card {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 44px 48px;
            box-shadow: var(--shadow-sm);
        }
        .article-card h1 {
            font-size: clamp(28px, 3vw, 36px);
            line-height: 1.4;
            font-weight: 800;
            color: var(--title);
            letter-spacing: -.4px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 18px;
            margin-top: 16px;
            padding-bottom: 22px;
            border-bottom: 1px solid var(--divider);
            color: var(--muted);
            font-size: 14px;
        }
        .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 7px;
        }
        .meta-item i {
            color: #9FB0C3;
            font-size: 14px;
        }
        .article-content {
            padding-top: 26px;
            font-size: 16px;
            line-height: 1.85;
            color: var(--text);
            word-break: break-word;
        }
        .article-content p {
            margin: 0 0 18px;
        }
        .article-content h2 {
            font-size: 24px;
            line-height: 1.45;
            font-weight: 700;
            color: var(--title);
            margin: 36px 0 16px;
            padding-bottom: 10px;
            border-bottom: 1px solid #F0F4FA;
        }
        .article-content h3 {
            font-size: 20px;
            line-height: 1.5;
            font-weight: 700;
            color: var(--title);
            margin: 30px 0 12px;
        }
        .article-content h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--title);
            margin: 24px 0 10px;
        }
        .article-content a {
            color: var(--primary);
            border-bottom: 1px solid rgba(22, 99, 220, .25);
            transition: color .2s ease, border-color .2s ease;
        }
        .article-content a:hover {
            color: var(--primary-dark);
            border-color: currentColor;
        }
        .article-content ul,
        .article-content ol {
            margin: 0 0 20px;
            padding-left: 24px;
        }
        .article-content ul li {
            list-style: disc;
            margin: 6px 0;
        }
        .article-content ol li {
            list-style: decimal;
            margin: 6px 0;
        }
        .article-content li::marker {
            color: var(--primary);
            font-weight: 700;
        }
        .article-content blockquote {
            background: #F0F6FE;
            border-left: 4px solid var(--primary);
            border-radius: 0 12px 12px 0;
            padding: 16px 22px;
            margin: 26px 0;
            color: #39506D;
        }
        .article-content blockquote p:last-child {
            margin-bottom: 0;
        }
        .article-content img {
            width: 100%;
            height: auto;
            border-radius: 12px;
            margin: 22px 0 10px;
        }
        .article-content figure {
            margin: 22px 0;
        }
        .article-content figcaption {
            font-size: 13px;
            color: var(--muted);
            text-align: center;
            margin-top: 8px;
        }
        .article-content table {
            display: block;
            width: 100%;
            max-width: 100%;
            overflow-x: auto;
            border-collapse: collapse;
            margin: 26px 0;
            background: #fff;
            border-radius: 10px;
            font-size: 15px;
        }
        .article-content th,
        .article-content td {
            border: 1px solid var(--border);
            padding: 10px 12px;
            text-align: left;
            vertical-align: top;
            line-height: 1.7;
        }
        .article-content th {
            background: var(--primary-soft);
            color: var(--title);
            font-weight: 600;
        }
        .article-content hr {
            border: none;
            border-top: 1px solid var(--divider);
            margin: 30px 0;
        }
        .article-content code {
            background: #F2F5FA;
            border: 1px solid #E6EDF6;
            border-radius: 6px;
            padding: 2px 8px;
            font-size: 14px;
            color: #C0474A;
        }
        .article-content pre {
            background: #10233F;
            color: #DCE7F3;
            border-radius: 14px;
            overflow-x: auto;
            padding: 20px;
            margin: 24px 0;
        }
        .article-content pre code {
            background: transparent;
            border: none;
            color: inherit;
            padding: 0;
        }
        .article-content iframe {
            max-width: 100%;
            border-radius: 12px;
            border: 0;
            margin: 20px 0;
        }
        .article-footer-tip {
            background: #F7F9FC;
            border-radius: 10px;
            padding: 10px 14px;
            font-size: 13px;
            color: #97A7BB;
            margin-top: 28px;
            line-height: 1.6;
        }
        .article-empty {
            text-align: center;
            padding: 60px 20px 40px;
        }
        .article-empty .empty-icon {
            display: inline-flex;
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: #EFF4FB;
            color: #9DB0C4;
            font-size: 24px;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
        }
        .article-empty p {
            color: var(--muted);
            font-size: 16px;
            margin-bottom: 22px;
        }

        /* ===== 下载引导条 ===== */
        .download-callout {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            background: #F6F9FE;
            border: 1px solid #DFEBF8;
            border-radius: 16px;
            padding: 20px 24px;
            margin-top: 28px;
            box-shadow: var(--shadow-sm);
        }
        .callout-text strong {
            display: block;
            font-size: 16px;
            color: var(--title);
            margin-bottom: 4px;
        }
        .callout-text p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.6;
        }
        .download-callout .fa-download {
            font-size: 15px;
        }

        /* ===== 相关阅读 ===== */
        .related-section {
            padding: 40px 0 8px;
        }
        .section-head {
            display: flex;
            align-items: end;
            justify-content: space-between;
            margin-bottom: 22px;
        }
        .section-head h2 {
            font-size: 26px;
            font-weight: 800;
            color: var(--title);
            line-height: 1.3;
        }
        .section-sub {
            font-size: 14px;
            color: var(--muted);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            display: flex;
            flex-direction: column;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
        }
        .related-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: rgba(22, 99, 220, .25);
        }
        .related-thumb {
            aspect-ratio: 16 / 10;
            background: #E8EFF7;
            overflow: hidden;
            position: relative;
        }
        .related-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .45s ease;
        }
        .related-card:hover .related-thumb img {
            transform: scale(1.05);
        }
        .thumb-tag {
            position: absolute;
            left: 12px;
            top: 12px;
            background: rgba(255, 255, 255, .92);
            color: var(--primary);
            font-size: 12px;
            font-weight: 700;
            padding: 5px 12px;
            border-radius: 999px;
            box-shadow: 0 4px 12px rgba(22, 60, 120, .12);
        }
        .related-info {
            display: flex;
            flex-direction: column;
            flex: 1;
            padding: 20px;
        }
        .related-info h3 {
            font-size: 17px;
            font-weight: 700;
            line-height: 1.5;
            color: var(--title);
            transition: color .2s ease;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card:hover .related-info h3 {
            color: var(--primary);
        }
        .related-info p {
            font-size: 14px;
            line-height: 1.7;
            color: var(--muted);
            margin-top: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: auto;
            padding-top: 16px;
            font-size: 13px;
            color: #9AABBE;
        }
        .related-meta em {
            font-style: normal;
            background: #F3F7FC;
            color: #60758E;
            padding: 4px 10px;
            border-radius: 999px;
            font-size: 12px;
        }
        .related-meta i {
            font-size: 14px;
            color: #B9C6D6;
            transition: transform .25s ease, color .25s ease;
        }
        .related-card:hover .related-meta i {
            color: var(--primary);
            transform: translateX(4px);
        }

        /* ===== 底部双向导航 ===== */
        .article-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            border-top: 1px solid #E1E9F3;
            margin-top: 22px;
            padding: 22px 0 6px;
            font-size: 14px;
        }
        .article-nav a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--muted);
            font-weight: 600;
            transition: color .2s ease;
        }
        .article-nav a:hover {
            color: var(--primary);
        }

        /* ===== Footer ===== */
        .footer {
            background: #10233F;
            color: #C4D2E4;
            margin-top: 36px;
        }
        .footer-main {
            display: grid;
            grid-template-columns: 1.7fr 1fr 1fr 1fr;
            gap: 40px;
            padding: 54px 0 36px;
        }
        .footer .logo {
            margin-bottom: 16px;
        }
        .footer .logo-icon {
            background: rgba(255, 255, 255, .12);
            color: #fff;
            box-shadow: none;
        }
        .footer .logo-text {
            color: #fff;
        }
        .footer .logo-text span {
            color: #7FB0FF;
        }
        .footer-brand p {
            font-size: 14px;
            color: #9DB0C4;
            line-height: 1.8;
            max-width: 300px;
        }
        .footer-links h4 {
            font-size: 15px;
            color: #F2F6FB;
            margin-bottom: 14px;
            font-weight: 700;
        }
        .footer-links li + li {
            margin-top: 8px;
        }
        .footer-links a {
            font-size: 14px;
            color: #9DB0C4;
            transition: color .2s ease, padding-left .2s ease;
        }
        .footer-links a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            border-top: 1px solid rgba(255, 255, 255, .1);
            padding: 18px 0 24px;
            font-size: 13px;
            color: #748AA2;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .header-nav {
                gap: 2px;
                margin-left: 8px;
            }
            .header-nav a {
                padding: 8px 10px;
                font-size: 14px;
            }
            .header-search {
                width: 180px;
            }
        }
        @media (max-width: 991px) {
            .header-inner {
                height: 56px;
            }
            .header-search {
                display: none;
            }
            .menu-toggle {
                display: inline-flex;
            }
            .header-nav {
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                display: none;
                flex-direction: column;
                align-items: stretch;
                margin-left: 0;
                background: #fff;
                padding: 10px 20px 18px;
                border-bottom: 1px solid var(--border);
                box-shadow: 0 14px 28px rgba(18, 50, 100, .1);
                gap: 2px;
            }
            .header-nav.open {
                display: flex;
            }
            .header-nav a {
                padding: 12px 14px;
                border-radius: 10px;
                font-size: 15px;
                border-bottom: 1px solid #F4F7FB;
            }
            .header-nav a:last-child {
                border-bottom: none;
            }
            .header-nav a.active {
                background: var(--primary-soft);
                color: var(--primary);
            }
            .header .container {
                padding: 0 18px;
            }
            .download-callout {
                flex-direction: column;
                align-items: flex-start;
            }
        }
        @media (max-width: 768px) {
            .article-wrap {
                padding: 24px 0 28px;
            }
            .article-card {
                padding: 30px 22px;
                border-radius: 16px;
            }
            .article-card h1 {
                font-size: 26px;
                line-height: 1.45;
            }
            .article-meta {
                gap: 12px;
                font-size: 13px;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .footer-main {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
                padding: 42px 0 30px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-brand p {
                max-width: none;
            }
        }
        @media (max-width: 560px) {
            .header-actions {
                gap: 8px;
            }
            .header .btn {
                padding: 8px 13px !important;
                font-size: 13px !important;
            }
            .header .logo-text {
                font-size: 18px;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .section-head {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
            }
            .section-head h2 {
                font-size: 22px;
            }
            .footer-main {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
            .breadcrumb .bc-cat,
            .breadcrumb .bc-current {
                max-width: 150px;
            }
            .article-nav {
                flex-direction: column;
                align-items: flex-start;
            }
        }

/* roulang page: category2 */
/* ========== Design System ========== */
        :root {
            --bg: #F4F8FD;
            --card: #FFFFFF;
            --surface: #EAF2FC;
            --primary: #1B6BF0;
            --primary-deep: #0E4FC0;
            --primary-soft: #E8F1FE;
            --accent: #FF9A3E;
            --accent-deep: #F0821F;
            --mint: #16B8A6;
            --text: #0E1E3A;
            --body: #3E5068;
            --muted: #8A9BB0;
            --border: #E5EDF8;
            --header-shadow: rgba(18, 50, 100, .06);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --shadow: 0 8px 24px rgba(18, 50, 100, .06);
            --shadow-hover: 0 16px 36px rgba(18, 50, 100, .12);
            --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.8;
            color: var(--body);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        ul,
        ol {
            list-style: none;
        }

        input,
        button {
            font-family: inherit;
        }

        button {
            border: none;
            background: none;
            cursor: pointer;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            line-height: 1;
            padding: 12px 24px;
            transition: all .25s ease;
            border: 1px solid transparent;
            white-space: nowrap;
        }

        .btn i {
            font-size: 14px;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
        }

        .btn-primary:hover {
            background: var(--primary-deep);
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

        .btn-light {
            background: #fff;
            color: var(--text);
        }

        .btn-light:hover {
            background: var(--primary-soft);
            transform: translateY(-2px);
        }

        .btn-outline {
            background: transparent;
            color: var(--text);
            border-color: #D5E2F2;
        }

        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-soft);
            transform: translateY(-2px);
        }

        .btn-accent {
            background: var(--accent);
            color: #fff;
        }

        .btn-accent:hover {
            background: var(--accent-deep);
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

        .section {
            padding: clamp(56px, 8vw, 96px) 0;
        }

        .section-title {
            font-size: clamp(24px, 2.8vw, 34px);
            font-weight: 700;
            color: var(--text);
            letter-spacing: -.3px;
            line-height: 1.3;
        }

        .section-sub {
            margin-top: 10px;
            color: var(--muted);
            max-width: 680px;
        }

        /* ========== Header ========== */
        .header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: #fff;
            border-bottom: 1px solid var(--border);
            box-shadow: 0 6px 18px rgba(18, 50, 100, .04);
        }

        .header-inner {
            display: flex;
            align-items: center;
            height: 64px;
            gap: 24px;
        }

        .logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 34px;
            height: 34px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--primary);
            color: #fff;
            border-radius: 10px;
            font-size: 17px;
            box-shadow: 0 6px 14px rgba(27, 107, 240, .28);
        }

        .logo-text {
            font-size: 19px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -.4px;
        }

        .logo-text span {
            color: var(--primary);
        }

        .header-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            margin: 0 auto;
        }

        .header-nav a {
            padding: 9px 14px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--body);
            transition: all .25s ease;
        }

        .header-nav a:hover {
            color: var(--primary);
            background: var(--primary-soft);
        }

        .header-nav a.active {
            color: var(--primary);
            background: var(--primary-soft);
            font-weight: 700;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .header-search {
            display: flex;
            align-items: center;
            gap: 8px;
            width: 220px;
            height: 40px;
            background: #F2F5FA;
            border-radius: 999px;
            padding: 0 14px;
            border: 1px solid transparent;
            transition: all .25s ease;
        }

        .header-search:focus-within {
            border-color: var(--primary);
            background: #fff;
            box-shadow: 0 0 0 3px rgba(27, 107, 240, .12);
        }

        .header-search .search-icon {
            color: var(--muted);
            font-size: 14px;
        }

        .header-search input {
            border: none;
            outline: none;
            background: transparent;
            width: 100%;
            font-size: 14px;
            color: var(--text);
        }

        .menu-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 40px;
            height: 40px;
            border-radius: 8px;
            padding: 8px;
            background: var(--primary-soft);
        }

        .menu-toggle span {
            display: block;
            height: 2px;
            background: var(--text);
            border-radius: 4px;
            transition: .3s;
        }

        /* ========== Category Banner ========== */
        .cat-banner {
            position: relative;
            background: var(--surface) url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            padding: clamp(48px, 7vw, 88px) 0;
            border-bottom: 1px solid var(--border);
        }

        .cat-banner::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(255, 255, 255, .96) 0%, rgba(255, 255, 255, .9) 48%, rgba(255, 255, 255, .72) 100%);
        }

        .cat-banner-inner {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 32px;
        }

        .cat-banner h1 {
            font-size: clamp(32px, 4.5vw, 48px);
            font-weight: 800;
            color: var(--text);
            line-height: 1.2;
            letter-spacing: -1px;
        }

        .cat-banner-desc {
            margin-top: 16px;
            font-size: 16px;
            color: var(--body);
            max-width: 580px;
        }

        .cat-banner-desc strong {
            color: var(--primary);
            font-weight: 700;
        }

        .cat-banner-btns {
            margin-top: 24px;
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }

        .cat-banner-note {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-top: 24px;
            font-size: 14px;
            color: var(--muted);
            background: rgba(255, 255, 255, .82);
            box-shadow: var(--shadow);
            border-radius: 999px;
            padding: 8px 16px;
            width: fit-content;
        }

        .cat-banner-note i {
            color: var(--mint);
            font-size: 14px;
        }

        /* ========== Category Layout ========== */
        .cat-layout {
            padding: clamp(44px, 6vw, 80px) 0;
        }

        .cat-grid {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 320px;
            gap: 36px;
            align-items: start;
        }

        .cat-main {
            min-width: 0;
        }

        .cat-aside {
            position: sticky;
            top: 92px;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .card {
            background: var(--card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            overflow: hidden;
        }

        /* Feature card */
        .feature-card {
            display: grid;
            grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
            background: var(--card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            overflow: hidden;
            margin-bottom: 32px;
        }

        .feature-media {
            position: relative;
            min-height: 270px;
            overflow: hidden;
        }

        .feature-media img {
            width: 100%;
            height: 100%;
            position: absolute;
            top: 0;
            left: 0;
            object-fit: cover;
            transition: transform .5s ease;
        }

        .feature-card:hover .feature-media img {
            transform: scale(1.04);
        }

        .feature-body {
            padding: 32px;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            justify-content: center;
        }

        .feature-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--primary-soft);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            border-radius: 999px;
            padding: 5px 12px;
        }

        .feature-body h2 {
            color: var(--text);
            font-size: 24px;
            line-height: 1.4;
            margin-top: 14px;
        }

        .feature-body p {
            margin-top: 12px;
            color: var(--body);
            font-size: 15px;
            line-height: 1.9;
        }

        .feature-meta {
            margin-top: 18px;
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

        .feature-meta span {
            font-size: 13px;
            color: var(--muted);
            background: #F4F7FB;
            border: 1px solid var(--border);
            border-radius: 6px;
            padding: 3px 9px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .feature-meta i {
            color: var(--mint);
            font-size: 12px;
        }

        .feature-btn {
            margin-top: 24px;
        }

        /* Block header */
        .block-header {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 16px;
            margin-bottom: 22px;
        }

        .block-header h2 {
            font-size: 24px;
            line-height: 1.3;
            color: var(--text);
        }

        .block-header p {
            color: var(--muted);
            font-size: 14px;
        }

        /* Game cards */
        .game-grid {
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 20px;
            margin-bottom: 48px;
        }

        .game-card {
            background: var(--card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            overflow: hidden;
            transition: all .3s ease;
        }

        .game-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: #CFE0F2;
        }

        .game-thumb {
            position: relative;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--surface);
        }

        .game-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .45s ease;
        }

        .game-card:hover .game-thumb img {
            transform: scale(1.05);
        }

        .game-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(14, 30, 58, .78);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: 999px;
            backdrop-filter: blur(8px);
        }

        .game-badge.hot {
            background: rgba(255, 154, 62, .9);
        }

        .game-badge.mint {
            background: rgba(22, 184, 166, .88);
        }

        .game-body {
            padding: 18px 18px 20px;
        }

        .game-body h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 6px;
            line-height: 1.4;
        }

        .game-body p {
            font-size: 14px;
            color: var(--body);
            line-height: 1.8;
            margin-bottom: 12px;
        }

        .game-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 7px;
        }

        .game-tags span {
            font-size: 12px;
            color: var(--muted);
            background: #F2F5FA;
            border-radius: 6px;
            padding: 3px 8px;
            transition: all .2s;
        }

        .game-card:hover .game-tags span {
            color: var(--primary);
            background: var(--primary-soft);
        }

        .game-foot {
            border-top: 1px dashed var(--border);
            margin-top: 14px;
            padding-top: 12px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 10px;
        }

        .game-foot span {
            font-size: 13px;
            color: var(--muted);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .game-link {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            transition: all .2s;
        }

        .game-link i {
            transition: transform .2s;
        }

        .game-link:hover i {
            transform: translateX(4px);
        }

        /* Feature rows */
        .pc-points {
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 16px;
            margin-bottom: 48px;
        }

        .point-item {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 22px 22px 20px;
            box-shadow: var(--shadow);
            transition: all .28s ease;
        }

        .point-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }

        .point-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--primary-soft);
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            margin-bottom: 14px;
        }

        .point-item h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
        }

        .point-item p {
            font-size: 14px;
            color: var(--body);
            line-height: 1.8;
        }

        /* Process */
        .process-band {
            background: #10233F;
            border-radius: var(--radius-lg);
            padding: 40px 32px;
            margin-bottom: 20px;
            box-shadow: var(--shadow);
            position: relative;
            overflow: hidden;
        }

        .process-band::before {
            content: "";
            position: absolute;
            width: 260px;
            height: 260px;
            border-radius: 50%;
            background: rgba(27, 107, 240, .2);
            right: -70px;
            top: -100px;
        }

        .process-band::after {
            content: "";
            position: absolute;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: rgba(255, 154, 62, .08);
            right: 120px;
            bottom: -100px;
        }

        .process-band .section-title {
            color: #fff;
            position: relative;
            z-index: 2;
        }

        .process-band .section-sub {
            color: rgba(255, 255, 255, .6);
            position: relative;
            z-index: 2;
        }

        .process-list {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 32px;
        }

        .process-item {
            background: rgba(255, 255, 255, .08);
            border: 1px solid rgba(255, 255, 255, .1);
            border-radius: var(--radius-md);
            padding: 24px 18px;
            backdrop-filter: blur(8px);
            transition: all .3s ease;
        }

        .process-item:hover {
            background: rgba(255, 255, 255, .14);
            transform: translateY(-3px);
        }

        .process-num {
            width: 34px;
            height: 34px;
            border-radius: 8px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            background: var(--accent);
            margin-bottom: 16px;
        }

        .process-item h3 {
            color: #fff;
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .process-item p {
            color: rgba(255, 255, 255, .64);
            font-size: 14px;
            line-height: 1.8;
        }

        /* Aside */
        .sidebar-card {
            background: var(--card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            padding: 20px;
        }

        .sidebar-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 8px;
            padding-bottom: 14px;
            border-bottom: 1px solid var(--border);
            margin-bottom: 16px;
        }

        .sidebar-title i {
            color: var(--primary);
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .tag-cloud a {
            background: #F2F5FA;
            font-size: 13px;
            color: var(--body);
            padding: 5px 12px;
            border-radius: 999px;
            border: 1px solid transparent;
            transition: all .2s;
        }

        .tag-cloud a:hover {
            background: var(--primary-soft);
            color: var(--primary);
            border-color: #C9DDF8;
        }

        .side-list {
            display: flex;
            flex-direction: column;
            gap: 0;
        }

        .side-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 11px 0;
            border-bottom: 1px dashed #EBF1F7;
            font-size: 14px;
            color: var(--body);
            line-height: 1.7;
        }

        .side-list li:last-child {
            border-bottom: 0;
        }

        .side-list li i {
            color: var(--mint);
            margin-top: 5px;
            font-size: 13px;
        }

        .notice-card {
            background: #FFF9F2;
            border-color: #FFE3C7;
        }

        .notice-card .sidebar-title i {
            color: var(--accent);
        }

        .notice-text {
            font-size: 13px;
            color: #7A6A58;
            line-height: 1.8;
        }

        /* ========== Category CTA ========== */
        .cat-cta {
            background: var(--primary) url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            position: relative;
            overflow: hidden;
        }

        .cat-cta::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(14, 79, 192, .94) 0%, rgba(27, 107, 240, .82) 100%);
        }

        .cat-cta-inner {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
            padding: 0 0;
        }

        .cat-cta h2 {
            color: #fff;
            font-size: clamp(22px, 2.6vw, 30px);
            font-weight: 700;
            line-height: 1.4;
        }

        .cat-cta p {
            color: rgba(255, 255, 255, .7);
            margin-top: 8px;
            font-size: 15px;
        }

        .cat-cta-btns {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }

        /* ========== FAQ ========== */
        .faq-section {
            padding: clamp(56px, 8vw, 96px) 0;
            background: #fff;
        }

        .faq-header {
            text-align: center;
            max-width: 760px;
            margin: 0 auto 40px;
        }

        .faq-header h2 {
            font-size: clamp(24px, 2.8vw, 34px);
            color: var(--text);
        }

        .faq-list {
            max-width: 860px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            background: #fff;
            overflow: hidden;
            transition: all .25s ease;
            box-shadow: 0 4px 12px rgba(18, 50, 100, .03);
        }

        .faq-item:hover {
            border-color: #CBDBF0;
        }

        .faq-item[open] {
            border-color: var(--primary);
            box-shadow: 0 10px 24px rgba(27, 107, 240, .08);
        }

        .faq-item summary {
            cursor: pointer;
            list-style: none;
            position: relative;
            padding: 16px 48px 16px 18px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            line-height: 1.6;
            user-select: none;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-icon {
            position: absolute;
            right: 16px;
            top: 50%;
            transform: translateY(-50%);
            width: 30px;
            height: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: var(--primary-soft);
            color: var(--primary);
            font-size: 16px;
            transition: all .3s ease;
        }

        .faq-item[open] .faq-icon {
            background: var(--primary);
            color: #fff;
            transform: translateY(-50%) rotate(135deg);
        }

        .faq-answer {
            padding: 0 18px 18px 18px;
            font-size: 14px;
            color: var(--body);
            border-top: 1px dashed #EDF2F8;
            margin: 0 18px;
            padding-left: 0;
            padding-right: 20px;
            padding-bottom: 16px;
            line-height: 1.9;
        }

        /* ========== Footer ========== */
        .footer {
            background: #10233F;
            color: rgba(255, 255, 255, .76);
            padding: 64px 0 24px;
        }

        .footer-main {
            display: grid;
            grid-template-columns: 1.5fr repeat(3, 1fr);
            gap: 36px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, .12);
        }

        .footer .logo-text {
            color: #fff;
        }

        .footer .logo-text span {
            color: #8DB6F7;
        }

        .footer .logo-icon {
            background: rgba(255, 255, 255, .14);
            box-shadow: none;
            color: #9CC3FF;
        }

        .footer-brand p {
            margin-top: 16px;
            font-size: 14px;
            color: rgba(255, 255, 255, .58);
            line-height: 1.9;
            max-width: 320px;
        }

        .footer-links h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 18px;
        }

        .footer-links li {
            margin-bottom: 11px;
        }

        .footer-links li a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, .64);
            transition: all .2s ease;
        }

        .footer-links li a::before {
            content: "";
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: rgba(255, 255, 255, .3);
            transition: background .2s;
        }

        .footer-links li a:hover {
            color: #fff;
            padding-left: 4px;
        }

        .footer-links li a:hover::before {
            background: var(--accent);
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            flex-wrap: wrap;
            padding-top: 24px;
            font-size: 13px;
            color: rgba(255, 255, 255, .38);
        }

        /* ========== Responsive ========== */
        @media (max-width: 1024px) {
            .header-inner {
                gap: 12px;
            }

            .header-search {
                width: 170px;
            }

            .cat-grid {
                grid-template-columns: 1fr;
            }

            .cat-aside {
                position: static;
                display: grid;
                grid-template-columns: repeat(2, minmax(0, 1fr));
            }

            .footer-main {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .header-inner {
                height: 56px;
            }

            .header-nav {
                position: fixed;
                top: 57px;
                left: 0;
                right: 0;
                background: #fff;
                border-bottom: 1px solid var(--border);
                flex-direction: column;
                align-items: stretch;
                padding: 12px 20px;
                box-shadow: 0 14px 24px rgba(18, 50, 100, .08);
                display: none;
                z-index: 99;
            }

            .header-nav.open {
                display: flex;
            }

            .header-nav a {
                padding: 12px 14px;
            }

            .header-search {
                display: none;
            }

            .menu-toggle {
                display: flex;
            }

            .header-actions {
                margin-left: auto;
            }

            .header .btn-primary {
                padding: 9px 14px !important;
                font-size: 13px !important;
            }

            .cat-banner-inner {
                flex-direction: column;
                align-items: flex-start;
            }

            .feature-card {
                grid-template-columns: 1fr;
            }

            .feature-media {
                min-height: 200px;
                position: relative;
            }

            .feature-media img {
                position: absolute;
            }

            .game-grid,
            .pc-points {
                grid-template-columns: 1fr;
            }

            .process-list {
                grid-template-columns: 1fr;
            }

            .cat-cta-inner {
                flex-direction: column;
                align-items: flex-start;
            }

            .cat-aside {
                grid-template-columns: 1fr;
            }

            .footer-main {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }

            .header .btn-primary span {
                display: none;
            }

            .header .btn-primary {
                font-size: 0 !important;
                width: 36px;
                padding: 8px 0 !important;
            }

            .game-body {
                padding: 16px;
            }

            .feature-body {
                padding: 22px;
            }

            .cat-cta .btn {
                padding: 11px 18px;
                font-size: 14px;
            }
        }

/* roulang page: category3 */
:root {
  --primary: #1B6BF0;
  --primary-strong: #1663DC;
  --primary-deep: #0E4FC0;
  --accent: #FF9A3E;
  --accent-deep: #F58A20;
  --mint: #16B8A6;
  --bg: #F4F8FD;
  --bg-deep: #E8F1F9;
  --card: #FFFFFF;
  --surface: #FBFDFF;
  --text: #0E1E3A;
  --body: #3E5068;
  --muted: #8A9BB0;
  --border: #E5EDF8;
  --shadow-sm: 0 8px 24px rgba(18, 50, 100, .06);
  --shadow-lg: 0 16px 36px rgba(18, 50, 100, .12);
  --radius-xs: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --container: 1200px;
  --gap: 24px;
  --section-pad: clamp(56px, 8vw, 96px);
  --header-h: 64px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  background:var(--bg);
  color:var(--body);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none;transition:color .2s ease}
ul,ol{list-style:none}
button,input{font-family:inherit;font-size:inherit;border:none;outline:none;background:none}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 var(--gap)}
.section{padding:var(--section-pad) 0}
.section-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 26px;border-radius:var(--radius-xs);
  font-weight:600;font-size:15px;cursor:pointer;transition:all .2s ease;
}
.btn i{font-size:15px}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 6px 16px rgba(27,107,240,.22)}
.btn-primary:hover{background:var(--primary-deep);transform:translateY(-2px);box-shadow:0 10px 24px rgba(27,107,240,.30)}
.btn-primary:active{transform:translateY(0)}
.btn-accent{background:var(--accent);color:#fff;box-shadow:0 6px 16px rgba(255,154,62,.25)}
.btn-accent:hover{background:var(--accent-deep);transform:translateY(-2px);box-shadow:0 10px 24px rgba(255,154,62,.35)}
.btn-outline{border:1.5px solid rgba(255,255,255,.84);color:#fff;background:transparent}
.btn-outline:hover{border-color:#fff;background:rgba(255,255,255,.12);transform:translateY(-2px)}
.btn-light{background:#fff;color:var(--primary-deep);box-shadow:0 8px 20px rgba(7,24,48,.14)}
.btn-light:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(7,24,48,.20)}

.header{
  position:sticky;top:0;z-index:100;height:var(--header-h);
  background:rgba(255,255,255,.95);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--border);
  box-shadow:0 4px 14px rgba(18,50,100,.04);
}
.header-inner{height:var(--header-h);display:flex;align-items:center;gap:24px}
.logo{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.logo-icon{
  width:32px;height:32px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  background:var(--primary);color:#fff;font-size:17px;box-shadow:0 6px 12px rgba(27,107,240,.22);
}
.logo-text{font-size:22px;font-weight:800;color:var(--text);letter-spacing:.5px;white-space:nowrap}
.logo-text span{color:var(--primary)}
.header-nav{display:flex;align-items:center;gap:8px;margin:0 auto}
.header-nav a{
  display:flex;align-items:center;height:40px;padding:0 15px;border-radius:var(--radius-pill);
  font-weight:500;font-size:15px;color:var(--body);position:relative;transition:all .2s ease;
}
.header-nav a:hover{color:var(--primary);background:#EEF4FE}
.header-nav a.active{color:var(--primary-deep);font-weight:700;background:#EAF1FE}
.header-nav a.active::after{
  content:"";position:absolute;left:16px;right:16px;bottom:-5px;height:3px;border-radius:4px;
  background:var(--accent);
}
.header-actions{display:flex;align-items:center;gap:14px;margin-left:auto}
.header-search{
  display:flex;align-items:center;gap:8px;background:#F2F5FA;border-radius:var(--radius-pill);
  height:40px;padding:0 14px;width:220px;border:1px solid transparent;transition:all .2s ease;
}
.header-search:focus-within{border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px rgba(27,107,240,.08)}
.header-search .search-icon{color:var(--muted);font-size:14px}
.header-search input{flex:1;background:transparent;color:var(--text);font-size:14px;line-height:1}
.header-search input::placeholder{color:var(--muted)}
.menu-toggle{display:none;width:42px;height:42px;flex-direction:column;justify-content:center;align-items:center;gap:5px;cursor:pointer}
.menu-toggle span{display:block;width:22px;height:2px;border-radius:3px;background:var(--text);transition:all .25s ease}
.menu-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle.open span:nth-child(2){opacity:0}
.menu-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.cat-hero{
  min-height:380px;display:flex;align-items:center;position:relative;overflow:hidden;
  background:
    linear-gradient(90deg,rgba(244,248,253,.98) 0%,rgba(244,248,253,.90) 56%,rgba(244,248,253,.56) 100%),
    url('/assets/images/backpic/back-1.png') center/cover no-repeat;
}
.cat-hero .container{position:relative;z-index:2;padding-top:40px;padding-bottom:40px}
.crumb{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--muted);margin-bottom:18px}
.crumb a:hover{color:var(--primary)}
.crumb i{font-size:11px;color:#bec9db}
.hero-badge{
  display:inline-flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--border);
  padding:5px 14px;border-radius:var(--radius-pill);font-size:13px;color:var(--primary);font-weight:600;
  margin-bottom:16px;box-shadow:var(--shadow-sm);
}
.hero-badge i{color:var(--accent)}
.cat-hero h1{
  font-size:clamp(32px,4vw,46px);font-weight:800;color:var(--text);line-height:1.2;margin-bottom:12px;
  letter-spacing:-.5px;
}
.cat-hero p.intro{font-size:18px;color:var(--body);max-width:620px;line-height:1.8}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.hero-tag{
  display:inline-flex;align-items:center;gap:7px;background:#fff;border:1px solid var(--border);
  border-radius:var(--radius-pill);padding:7px 16px;font-size:13px;color:var(--body);box-shadow:var(--shadow-sm);
}
.hero-tag i{color:var(--mint);font-size:14px}
.hero-tag.hot i{color:var(--accent)}

.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:38px}
.section-head .tagline{display:block;font-size:14px;font-weight:600;color:var(--primary);letter-spacing:1px;margin-bottom:6px}
.section-head h2{font-size:clamp(24px,2.8vw,34px);font-weight:700;color:var(--text);line-height:1.3}
.section-head p{color:var(--muted);font-size:15px}

.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap)}
.feature-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius-md);
  padding:30px 26px;box-shadow:var(--shadow-sm);transition:transform .25s ease,box-shadow .25s ease;
}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.feature-ico{
  width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  background:#EAF1FE;color:var(--primary);font-size:22px;margin-bottom:18px;
}
.feature-card:nth-child(2) .feature-ico{background:#FFF2E5;color:var(--accent)}
.feature-card:nth-child(3) .feature-ico{background:#E6FAF7;color:var(--mint)}
.feature-card:nth-child(4) .feature-ico{background:#F0ECFF;color:#7356DB}
.feature-card h3{font-size:18px;font-weight:700;color:var(--text);margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--muted);line-height:1.75}

.rank-wrap{display:grid;grid-template-columns:1fr;gap:var(--gap)}
.rank-hero-card{
  display:grid;grid-template-columns:1.05fr .95fr;gap:0;background:var(--card);
  border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-sm);
}
.rank-content{padding:36px 38px;display:flex;flex-direction:column;justify-content:center}
.rank-no{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--primary-deep);
  background:#EAF1FE;border-radius:var(--radius-pill);padding:5px 14px;width:fit-content;
  font-weight:700;margin-bottom:16px;
}
.rank-no i{color:var(--accent)}
.rank-content h3{font-size:26px;font-weight:800;color:var(--text);margin-bottom:6px}
.rank-meta{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:14px}
.badge{display:inline-flex;align-items:center;gap:5px;font-size:12px;padding:4px 10px;border-radius:var(--radius-pill);font-weight:600}
.badge-blue{background:#EAF1FE;color:var(--primary)}
.badge-mint{background:#E6FAF7;color:#108F82}
.badge-orange{background:#FFF2E5;color:var(--accent-deep)}
.rank-score{display:flex;align-items:center;gap:6px;color:var(--text);font-weight:700;margin-bottom:0}
.rank-score i{color:var(--accent)}
.rank-content p{color:var(--body);font-size:15px;margin-bottom:20px;line-height:1.85}
.rank-thumb{position:relative;min-height:300px;background:#e8f1fb}
.rank-thumb img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.rank-first-tag{
  position:absolute;top:18px;left:18px;width:46px;height:46px;border-radius:12px;
  background:var(--accent);color:#fff;font-weight:800;font-size:20px;display:flex;align-items:center;justify-content:center;
  box-shadow:0 8px 18px rgba(255,154,62,.35);z-index:2;
}
.rank-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap);margin-top:var(--gap)}
.rank-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;
  box-shadow:var(--shadow-sm);transition:transform .25s ease,box-shadow .25s ease;
}
.rank-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.rank-card .thumb{position:relative;aspect-ratio:16/10;object-fit:cover;background:#dfeaf7}
.rank-card .thumb img{width:100%;height:100%;object-fit:cover}
.rank-card .no{
  position:absolute;top:12px;left:12px;width:36px;height:36px;border-radius:10px;
  background:rgba(255,255,255,.92);color:var(--primary-deep);font-weight:800;display:flex;align-items:center;
  justify-content:center;box-shadow:0 4px 10px rgba(18,50,100,.08);font-size:15px;backdrop-filter:blur(3px);
}
.rank-card .no.no2{color:var(--accent-deep)}
.rank-card .no.no3{color:#C96A3A}
.rank-info{padding:20px 20px 22px}
.rank-info h3{font-size:17px;color:var(--text);margin-bottom:8px;font-weight:700}
.rank-info .badges{display:flex;gap:8px;margin-bottom:10px;flex-wrap:wrap}
.rank-info .score{display:flex;align-items:center;gap:5px;color:var(--accent-deep);font-size:14px;font-weight:700}
.rank-info .score i{color:var(--accent)}
.rank-info .score span{color:var(--muted);font-weight:400;font-size:13px;margin-left:6px}
.rank-info a.game-link{
  display:inline-flex;align-items:center;gap:6px;margin-top:12px;font-size:14px;font-weight:600;
  color:var(--primary);transition:gap .2s ease;
}
.rank-info a.game-link:hover{gap:10px}

.flow-section{background:var(--bg-deep)}
.flow-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap);counter-reset:flow}
.flow-item{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius-md);padding:30px 24px;position:relative;
  box-shadow:var(--shadow-sm);transition:transform .25s ease;
}
.flow-item:hover{transform:translateY(-6px)}
.flow-item::before{
  counter-increment:flow;content:"0" counter(flow);
  font-size:13px;font-weight:800;color:#fff;background:var(--primary);
  display:flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:50%;
  box-shadow:0 5px 14px rgba(27,107,240,.24);margin-bottom:18px;
}
.flow-item:nth-child(2)::before{background:var(--primary-strong)}
.flow-item:nth-child(3)::before{background:var(--accent);box-shadow:0 5px 14px rgba(255,154,62,.3)}
.flow-item:nth-child(4)::before{background:var(--mint);box-shadow:0 5px 14px rgba(22,184,166,.24)}
.flow-item h3{font-size:18px;font-weight:700;color:var(--text);margin-bottom:8px}
.flow-item p{font-size:14px;color:var(--muted);line-height:1.75}

.scene-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:var(--gap)}
.scene-main{
  grid-column:span 7;background:linear-gradient(135deg,#1B6BF0,#1663DC);border-radius:var(--radius-lg);
  padding:38px;color:#fff;display:flex;flex-direction:column;justify-content:center;box-shadow:0 14px 30px rgba(27,107,240,.2);
  position:relative;overflow:hidden;
}
.scene-main::after{
  content:"\f11b";font-family:"Font Awesome 6 Free";font-weight:900;font-size:116px;opacity:.1;
  position:absolute;right:20px;bottom:-16px;
}
.scene-main h3{font-size:28px;font-weight:800;line-height:1.4;margin-bottom:12px}
.scene-main p{font-size:15px;opacity:.92;line-height:1.85;max-width:480px}
.scene-list{grid-column:span 5;display:grid;grid-template-columns:1fr 1fr;gap:var(--gap)}
.scene-mini{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius-md);padding:24px;
  box-shadow:var(--shadow-sm);transition:transform .22s ease;
}
.scene-mini:hover{transform:translateY(-4px)}
.scene-mini i{font-size:22px;color:var(--primary);background:#EAF1FE;border-radius:12px;width:46px;height:46px;display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.scene-mini h4{color:var(--text);font-size:16px;margin-bottom:6px}
.scene-mini p{font-size:13px;color:var(--muted);line-height:1.7}
.scene-mini:nth-child(2) i{background:#FFF2E5;color:var(--accent)}
.scene-mini:nth-child(3) i{background:#E6FAF7;color:var(--mint)}
.scene-mini:nth-child(4) i{background:#F0ECFF;color:#7356DB}

.cross-band{background:var(--card);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.cross-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.cross-item{
  display:flex;align-items:center;gap:14px;border:1px solid var(--border);border-radius:var(--radius-md);
  background:var(--surface);padding:18px 20px;transition:all .22s ease;
}
.cross-item:hover{border-color:var(--primary);background:#F4F9FF;transform:translateY(-3px);box-shadow:var(--shadow-sm)}
.cross-item i{font-size:24px;color:var(--primary);width:48px;height:48px;flex-shrink:0;border-radius:13px;background:#EAF1FE;display:flex;align-items:center;justify-content:center}
.cross-item h4{color:var(--text);font-size:16px;margin-bottom:2px}
.cross-item p{font-size:13px;color:var(--muted)}
.cross-item .arr{margin-left:auto;color:#B9C7DC;font-size:14px;transition:transform .2s ease}
.cross-item:hover .arr{transform:translateX(4px);color:var(--primary)}

.faq-section{--bg:transparent}
.faq-grid{max-width:860px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-unit{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);overflow:hidden;transition:border-color .22s ease,box-shadow .22s ease}
.faq-unit:hover{border-color:#cfdff4}
.faq-unit[open]{box-shadow:var(--shadow-lg)}
.faq-unit summary{
  cursor:pointer;display:flex;align-items:center;gap:12px;list-style:none;padding:20px 24px;
  color:var(--text);font-weight:700;font-size:16px;line-height:1.6;user-select:none;
}
.faq-unit summary::-webkit-details-marker{display:none}
.faq-unit summary::before{
  content:"+";flex-shrink:0;display:flex;align-items:center;justify-content:center;width:26px;height:26px;
  border-radius:8px;background:#EAF1FE;color:var(--primary);font-size:18px;font-weight:600;transition:all .22s ease;
}
.faq-unit[open] summary::before{
  content:"−";background:var(--primary);color:#fff;transform:rotate(180deg);
}
.faq-unit .answer{padding:0 24px 22px 62px;color:var(--body);font-size:14.5px;line-height:1.85}
.faq-unit .answer p{margin-bottom:8px}
.faq-unit .answer p:last-child{margin-bottom:0}

.cta-band{
  position:relative;background:#10233F;color:#fff;overflow:hidden;
  border-radius:0;
}
.cta-band .box{
  position:relative;z-index:2;padding:clamp(50px,6vw,78px) 0;
}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:38px;flex-wrap:wrap}
.cta-copy{max-width:640px}
.cta-copy h2{font-size:clamp(24px,3vw,34px);line-height:1.4;font-weight:800;margin-bottom:12px;color:#fff}
.cta-copy h2 span{color:var(--accent)}
.cta-copy p{color:rgba(255,255,255,.78);font-size:15.5px;margin-bottom:26px;line-height:1.85}
.cta-btns{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.cta-note{display:flex;gap:18px;flex-wrap:wrap;margin-top:22px}
.cta-note span{display:inline-flex;align-items:center;gap:7px;color:rgba(255,255,255,.76);font-size:13px}
.cta-note i{color:var(--mint)}
.cta-ornament{width:240px;height:240px;border-radius:22px;background:#FF9A3E;display:flex;align-items:center;justify-content:center;position:relative;flex-shrink:0}
.cta-ornament::before{
  content:"\f11b";font-family:"Font Awesome 6 Free";font-weight:900;font-size:96px;color:#fff;
  filter:drop-shadow(0 10px 20px rgba(0,0,0,.12));
}
.cta-ornament span{position:absolute;bottom:14px;left:50%;transform:translateX(-50%);font-size:13px;color:rgba(255,255,255,.92);background:rgba(0,0,0,.12);padding:3px 12px;border-radius:999px;white-space:nowrap}

.footer{background:#10233F;color:rgba(255,255,255,.72);padding:64px 0 0;margin-top:0}
.footer .logo-text{color:#fff}
.footer .logo-text span{color:var(--accent)}
.footer .logo-icon{background:var(--accent);color:#10233F;box-shadow:none}
.footer-main{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:38px;padding-bottom:46px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-brand p{font-size:13.5px;line-height:1.85;margin-top:14px;max-width:300px;color:rgba(255,255,255,.65)}
.footer-links h4{color:#fff;font-size:15px;margin-bottom:14px;font-weight:700}
.footer-links li{margin-bottom:9px}
.footer-links a{font-size:14px;color:rgba(255,255,255,.7);transition:color .2s ease,padding-left .2s ease}
.footer-links a:hover{color:var(--accent);padding-left:3px}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;padding:18px 0 22px;font-size:13px;color:rgba(255,255,255,.48)}

@media (max-width:1024px) {
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .flow-grid{grid-template-columns:repeat(2,1fr)}
  .rank-grid{grid-template-columns:repeat(2,1fr)}
  .footer-main{grid-template-columns:1fr 1fr}
  .header-search{width:180px}
  .scene-grid{grid-template-columns:1fr}
  .scene-main{grid-column:auto}
  .scene-list{grid-column:auto}
}
@media (max-width:820px) {
  .header{padding:0 16px}
  .header-inner{flex-wrap:wrap;height:auto;min-height:56px;}
  .header-nav{
    display:none;flex-direction:column;position:absolute;top:56px;left:0;right:0;z-index:99;
    width:100%;background:#fff;border-bottom:1px solid var(--border);padding:10px 0;
    box-shadow:0 24px 30px rgba(18,50,100,.10);align-items:stretch;
  }
  .header-nav.open{display:flex}
  .header-nav a{height:46px;justify-content:center;border-radius:8px;margin:0 14px;}
  .header-nav a.active::after{display:none}
  .header-nav a.active{background:#EAF1FE}
  .menu-toggle{display:flex}
  .header-actions{display:flex;margin-left:auto}
  .header-search{width:42px;padding:0;justify-content:center;}
  .header-search input{display:none}
  .header-search:focus-within{width:52vw;padding:0 10px;position:absolute;right:100px}
  .header-search:focus-within input{display:block}
  .header-search .search-icon{margin:0}
  .btn-extra-hide{white-space:nowrap;padding:0 16px}
}
@media (max-width:600px) {
  .logo-text{font-size:19px}
  .cat-hero{min-height:310px}
  .hero-badge{font-size:12px;padding:4px 11px}
  .cat-hero h1{font-size:30px}
  .cat-hero p.intro{font-size:15px}
  .section-head{flex-direction:column;align-items:flex-start}
  .section-head p{font-size:14px}
  .feature-grid{grid-template-columns:1fr}
  .rank-hero-card{grid-template-columns:1fr}
  .rank-thumb{order:-1;min-height:210px}
  .rank-content{padding:26px 24px}
  .rank-grid{grid-template-columns:1fr}
  .flow-grid{grid-template-columns:1fr}
  .cross-grid{grid-template-columns:1fr}
  .scene-list{grid-template-columns:1fr;}
  .cta-inner{flex-direction:column;align-items:flex-start}
  .cta-ornament{width:100%;height:160px;border-radius:18px}
  .cta-btns .btn{width:100%}
  .footer-main{grid-template-columns:1fr;gap:30px}
  .faq-unit summary{font-size:15px;padding:16px}
  .faq-unit .answer{padding:0 16px 18px 50px}
}

/* roulang page: category4 */
:root{
        --bg:#F4F8FD;
        --bg-deep:#EAF2FB;
        --card:#FFFFFF;
        --surface:#F1F6FD;
        --border:#E3EBF5;
        --primary:#1B6BF0;
        --primary-dark:#0E4FC0;
        --orange:#FF9A3E;
        --mint:#16B8A6;
        --text-title:#0E1E3A;
        --text-body:#3A4D66;
        --text-soft:#7E90A8;
        --darkblue:#10233F;
        --radius-sm:8px;
        --radius-md:14px;
        --radius-lg:20px;
        --shadow-sm:0 8px 24px rgba(18,50,100,.06);
        --shadow-md:0 16px 36px rgba(18,50,100,.12);
        --header-h:64px;
        --gap:24px;
        --section-y:clamp(56px, 8vw, 96px);
    }
    *{margin:0;padding:0;box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
        background:var(--bg);
        color:var(--text-body);
        font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
        font-size:16px;
        line-height:1.8;
        -webkit-font-smoothing:antialiased;
    }
    img{max-width:100%;display:block}
    a{color:inherit;text-decoration:none}
    ul,ol{list-style:none}
    button,input{font-family:inherit;font-size:inherit}
    i{line-height:1}
    .container{max-width:1200px;margin:0 auto;padding:0 var(--gap)}
    .btn{
        display:inline-flex;align-items:center;justify-content:center;gap:8px;
        padding:10px 22px;border:1px solid transparent;border-radius:var(--radius-sm);
        font-weight:600;font-size:15px;line-height:1.6;cursor:pointer;
        transition:all .25s ease;white-space:nowrap;
    }
    btn, .btn:focus-visible{outline:none}
    .btn-primary{background:var(--primary);color:#fff;box-shadow:0 6px 18px rgba(27,107,240,.26)}
    .btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 10px 22px rgba(27,107,240,.3)}
    .btn-primary:active{transform:translateY(0)}
    .btn-outline{background:transparent;border-color:rgba(255,255,255,.6);color:#fff}
    .btn-outline:hover{background:rgba(255,255,255,.12);border-color:#fff;transform:translateY(-2px)}
    .btn-light{background:#fff;color:var(--primary-dark)}
    .btn-light:hover{background:#EEF3FF;transform:translateY(-2px);box-shadow:0 10px 24px rgba(16,35,63,.18)}
    .btn:focus-visible{outline:3px solid rgba(27,107,240,.35);outline-offset:2px}
    /* ---------- header ---------- */
    .header{
        position:sticky;top:0;z-index:999;
        background:rgba(255,255,255,.94);backdrop-filter:blur(10px);
        border-bottom:1px solid var(--border);
        box-shadow:0 4px 16px rgba(18,50,100,.04);
    }
    .header .header-inner{height:var(--header-h);display:flex;align-items:center;gap:28px}
    .logo{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
    .logo-icon{
        width:32px;height:32px;border-radius:9px;
        background:linear-gradient(135deg,var(--primary),var(--primary-dark));
        color:#fff;display:flex;align-items:center;justify-content:center;
        font-size:15px;box-shadow:0 6px 14px rgba(27,107,240,.25);
    }
    .logo-text{font-weight:800;font-size:20px;color:var(--text-title);letter-spacing:.5px}
    .logo-text span{color:var(--primary)}
    .header-nav{display:flex;align-items:center;gap:4px;margin:0 auto}
    .header-nav a{
        position:relative;display:block;padding:9px 14px;border-radius:999px;
        font-size:15px;font-weight:500;color:var(--text-body);
        transition:all .22s ease;
    }
    .header-nav a:hover{color:var(--primary);background:#EAF3FF}
    .header-nav a.active{color:var(--primary);background:#E8F1FE;font-weight:600}
    .header-nav a.active::after{
        content:"";position:absolute;left:18px;right:18px;bottom:1px;height:3px;
        border-radius:3px;background:var(--orange);
    }
    .header-actions{display:flex;align-items:center;gap:14px;flex-shrink:0}
    .header-search{
        display:flex;align-items:center;gap:8px;width:220px;height:38px;
        padding:0 14px;background:#F0F5FC;border:1px solid transparent;
        border-radius:999px;color:var(--text-soft);transition:all .22s;
    }
    .header-search:focus-within{
        background:#fff;border-color:var(--primary);box-shadow:0 0 0 3px rgba(27,107,240,.1);
    }
    .header-search input{width:100%;border:none;background:transparent;font-size:14px;color:var(--text-body);outline:none}
    .header-search input::placeholder{color:var(--text-soft)}
    .header-search .search-icon{font-size:14px;color:var(--text-soft)}
    .menu-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:38px;height:38px;background:transparent;border:1px solid var(--border);border-radius:8px;padding:8px;cursor:pointer;transition:.2s}
    .menu-toggle span{display:block;width:100%;height:2px;background:var(--text-title);border-radius:2px;transition:.25s}
    .menu-toggle:hover{background:#F0F5FC}
    /* ---------- cat hero ---------- */
    .cat-hero{
        position:relative;overflow:hidden;
        background:linear-gradient(100deg,rgba(11,34,68,.94) 0,rgba(14,72,160,.82) 60%,rgba(27,107,240,.62) 100%),url("/assets/images/backpic/back-1.png") center/cover no-repeat;
        color:#fff;padding:clamp(56px, 8vw, 92px) 0 56px;
    }
    .cat-hero::after{
        content:"";position:absolute;right:-80px;bottom:-80px;width:280px;height:280px;border-radius:50%;
        background:rgba(22,184,166,.18);filter:blur(10px);
    }
    .cat-hero .cat-hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.3fr .7fr;gap:30px;align-items:center}
    .cat-kicker{
        display:inline-flex;align-items:center;gap:8px;
        background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.22);
        padding:6px 14px;border-radius:999px;font-size:13px;font-weight:500;letter-spacing:.3px;color:#EAF3FF;
    }
    .cat-hero h1{font-size:clamp(30px,3.6vw,46px);font-weight:800;color:#fff;margin:18px 0 12px;line-height:1.25}
    .cat-hero p{font-size:clamp(15px,1.4vw,18px);color:rgba(255,255,255,.9);max-width:560px;margin:0 0 22px}
    .cat-hero-tags{display:flex;flex-wrap:wrap;gap:10px}
    .cat-hero-tags span{
        display:inline-flex;align-items:center;gap:7px;
        padding:6px 14px;border-radius:999px;background:rgba(255,255,255,.12);
        border:1px solid rgba(255,255,255,.15);font-size:13px;
    }
    .cat-hero-aside{
        text-align:center;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);
        border-radius:var(--radius-lg);padding:32px 20px;backdrop-filter:blur(4px);
    }
    .cat-hero-aside i{font-size:44px;color:var(--orange);margin-bottom:12px}
    .cat-hero-aside strong{display:block;font-size:20px;font-weight:700;color:#fff}
    .cat-hero-aside p{font-size:13px;margin-top:6px;color:rgba(255,255,255,.8)}
    /* ---------- category value ---------- */
    .section{position:relative;z-index:1}
    .cat-value{padding:var(--section-y) 0 0}
    .cat-value-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
    .value-card{
        background:var(--card);border:1px solid var(--border);border-radius:var(--radius-md);
        padding:28px 26px;box-shadow:var(--shadow-sm);transition:all .28s ease;position:relative;overflow:hidden;
    }
    .value-card::before{
        content:"";position:absolute;left:0;top:0;width:4px;height:100%;background:var(--primary);
        opacity:0;transition:.3s;
    }
    .value-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}
    .value-card:hover::before{opacity:1}
    .value-icon{
        width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;
        font-size:20px;background:#EAF3FF;color:var(--primary);margin-bottom:16px;
    }
    .value-card:nth-child(2) .value-icon{background:#FFF1E6;color:var(--orange)}
    .value-card:nth-child(3) .value-icon{background:#E8FAF8;color:var(--mint)}
    .value-card h3{font-size:18px;font-weight:700;color:var(--text-title);margin-bottom:8px}
    .value-card p{font-size:14px;line-height:1.75;color:var(--text-body);margin-bottom:0}
    /* ---------- category layout ---------- */
    .cat-content{padding:var(--section-y) 0;background:var(--bg)}
    .category-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:32px;align-items:start}
    .section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:24px}
    .section-head h2{font-size:clamp(24px,2.6vw,32px);font-weight:700;color:var(--text-title);line-height:1.4}
    .section-head p{color:var(--text-soft);font-size:14px;margin:6px 0 0}
    .focus-card{
        display:grid;grid-template-columns:minmax(0,460px) 1fr;background:var(--card);
        border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;
        box-shadow:var(--shadow-sm);margin-bottom:24px;transition:all .3s;
    }
    .focus-card:hover{box-shadow:var(--shadow-md);transform:translateY(-3px)}
    .focus-cover{min-height:280px;overflow:hidden;position:relative}
    .focus-cover img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
    .focus-card:hover .focus-cover img{transform:scale(1.04)}
    .focus-cover .mark{
        position:absolute;left:16px;top:16px;background:var(--orange);color:#fff;
        padding:5px 12px;border-radius:999px;font-size:12px;font-weight:600;letter-spacing:.5px;
    }
    .focus-body{padding:28px 30px;display:flex;flex-direction:column}
    .focus-body h3{font-size:22px;font-weight:700;color:var(--text-title);line-height:1.5;margin-bottom:12px}
    .focus-body p{font-size:15px;line-height:1.8;color:var(--text-body);flex:1}
    .card-tags{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 10px}
    .card-tags .tag{
        display:inline-flex;align-items:center;gap:5px;
        background:#F0F6FD;border:1px solid #DFEAF7;color:#49607C;
        border-radius:999px;padding:4px 12px;font-size:12.5px;line-height:1.5;
    }
    .card-meta{display:flex;align-items:center;gap:18px;color:var(--text-soft);font-size:13px}
    .card-meta i{margin-right:4px}
    .featured-footer{
        display:flex;align-items:center;justify-content:space-between;gap:10px;
        padding-top:14px;border-top:1px solid #EDF1F7;
    }
    .guide-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
    .guide-card{
        background:var(--card);border:1px solid var(--border);border-radius:var(--radius-md);
        overflow:hidden;transition:all .3s;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;
    }
    .guide-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}
    .guide-pic{height:188px;overflow:hidden}
    .guide-pic img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
    .guide-card:hover .guide-pic img{transform:scale(1.06)}
    .guide-body{padding:20px 22px;flex:1;display:flex;flex-direction:column}
    .guide-body .mini-tag{
        display:inline-flex;width:max-content;background:#E8F4FF;color:var(--primary);
        font-size:12px;font-weight:600;padding:3px 10px;border-radius:999px;margin-bottom:10px;
    }
    .guide-body h3{font-size:17px;line-height:1.55;color:var(--text-title);font-weight:700;margin-bottom:8px}
    .guide-body p{font-size:13.5px;color:var(--text-soft);line-height:1.7;flex:1}
    .guide-body .card-tags{margin:14px 0 4px}
    .guide-body .card-tags .tag{background:#F7F9FC;border-color:#E8EDF4;color:var(--text-soft)}
    /* ---------- sidebar ---------- */
    .sidebar{display:flex;flex-direction:column;gap:24px;position:sticky;top:calc(var(--header-h) + 16px)}
    .side-card{
        background:var(--card);border:1px solid var(--border);
        border-radius:var(--radius-md);box-shadow:var(--shadow-sm);padding:24px;
    }
    .side-title{display:flex;align-items:center;gap:8px;font-size:16px;font-weight:700;color:var(--text-title);padding-bottom:14px;margin-bottom:16px;border-bottom:1px solid #EDF1F7}
    .side-title i{color:var(--primary);font-size:16px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-chip{
        display:inline-flex;align-items:center;gap:6px;
        background:#F0F5FC;border-radius:999px;padding:6px 14px;
        font-size:13px;color:#49607C;border:1px solid transparent;transition:.2s;
    }
    .tag-chip:hover{background:var(--primary);border-color:var(--primary);color:#fff}
    .tag-chip i{font-size:10px}
    .notice-list li{display:flex;gap:10px;font-size:13.5px;line-height:1.7;color:var(--text-body);padding:7px 0;border-bottom:1px dashed #EEF1F6}
    .notice-list li:last-child{border-bottom:none}
    .notice-list i{color:var(--mint);margin-top:4px;font-size:13px}
    .side-weak{
        background:#F7FAFE;border-radius:10px;padding:14px 16px;
        font-size:12.5px;color:var(--text-soft);line-height:1.7;
    }
    .side-weak strong{display:block;color:var(--text-title);font-weight:600;margin-bottom:4px}
    /* ---------- steps ---------- */
    .steps-band{padding:var(--section-y) 0;background:var(--card);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
    .steps-head{text-align:center;max-width:680px;margin:0 auto 40px}
    .steps-head .eyebrow{
        display:inline-flex;align-items:center;gap:8px;background:#FFF1E6;color:#E2760A;
        font-size:13px;font-weight:600;padding:5px 14px;border-radius:999px;letter-spacing:.3px;margin-bottom:14px;
    }
    .steps-head h2{font-size:clamp(24px,2.6vw,32px);color:var(--text-title);font-weight:700}
    .steps-head p{color:var(--text-soft);margin-top:8px;font-size:15px}
    .steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;counter-reset:step}
    .step-card{
        background:var(--bg);padding:28px 24px;border-radius:var(--radius-md);border:1px solid var(--border);
        position:relative;transition:.25s;
    }
    .step-card:hover{background:#EFF5FF;transform:translateY(-4px)}
    .step-num{
        width:42px;height:42px;border-radius:50%;background:var(--primary);color:#fff;
        display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;
        margin-bottom:16px;
    }
    .step-card:nth-child(2) .step-num{background:var(--orange)}
    .step-card:nth-child(3) .step-num{background:var(--mint)}
    .step-card h3{font-size:17px;color:var(--text-title);font-weight:700;margin-bottom:8px}
    .step-card p{font-size:14px;line-height:1.75;color:var(--text-body)}
    /* ---------- faq ---------- */
    .faq-band{padding:var(--section-y) 0}
    .faq-wrap{max-width:820px;margin:0 auto}
    .faq-head{text-align:center;margin-bottom:36px}
    .faq-head h2{font-size:clamp(24px,2.6vw,32px);color:var(--text-title);font-weight:700}
    .faq-head p{color:var(--text-soft);font-size:15px;margin-top:8px}
    .faq-list details{
        background:var(--card);border:1px solid var(--border);border-radius:12px;
        margin-bottom:12px;overflow:hidden;transition:.25s;
    }
    .faq-list details[open]{box-shadow:var(--shadow-sm);border-color:#D6E5FA}
    .faq-list summary{
        list-style:none;cursor:pointer;position:relative;
        display:flex;align-items:center;justify-content:space-between;gap:16px;
        padding:18px 22px;font-weight:600;color:var(--text-title);
        transition:.2s;
    }
    .faq-list summary::-webkit-details-marker{display:none}
    .faq-list summary .faq-arrow{position:relative;width:22px;height:22px;flex-shrink:0}
    .faq-list summary .faq-arrow::before,.faq-list summary .faq-arrow::after{
        content:"";position:absolute;left:50%;top:50%;width:10px;height:2px;border-radius:3px;
        background:var(--primary);transform:translate(-50%,-50%);
        transition:.28s;
    }
    .faq-list summary .faq-arrow::after{transform:translate(-50%,-50%) rotate(90deg)}
    .faq-list details[open] summary .faq-arrow::after{transform:translate(-50%,-50%) rotate(0)}
    .faq-list summary:hover{background:#F6FAFF}
    .faq-list details p{padding:0 22px 20px;font-size:14.5px;color:var(--text-body);border-top:1px dashed #E1E9F3;margin:0 22px 0;padding-top:14px}
    /* ---------- cta ---------- */
    .cta-band{
        position:relative;overflow:hidden;
        background:linear-gradient(105deg,rgba(10,30,60,.96),rgba(14,60,135,.88)),url("/assets/images/backpic/back-2.png") center/cover no-repeat;
        padding:clamp(56px,7vw,80px) 0;color:#fff;
    }
    .cta-inner{display:flex;align-items:center;justify-content:space-between;gap:36px;flex-wrap:wrap}
    .cta-text h2{font-size:clamp(22px,2.8vw,32px);font-weight:700;color:#fff;line-height:1.5}
    .cta-text p{color:rgba(255,255,255,.8);font-size:15px;margin-top:10px;max-width:620px}
    .cta-qr{
        display:flex;align-items:center;gap:20px;background:rgba(255,255,255,.1);
        border:1px solid rgba(255,255,255,.16);border-radius:var(--radius-md);padding:12px 22px;
    }
    .cta-qr .qr-box{width:76px;height:76px;background:#fff;border-radius:10px;display:flex;align-items:center;justify-content:center;color:#0E1E3A;font-size:28px}
    .cta-btns{display:flex;gap:14px;flex-wrap:wrap}
    .cta-btns .btn{padding:12px 26px;font-size:16px}
    /* ---------- footer ---------- */
    .footer{background:#10233F;color:rgba(255,255,255,.82)}
    .footer-main{
        display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;
        gap:40px;padding:64px 0 44px;
    }
    .footer-brand p{font-size:14px;line-height:1.9;margin-top:16px;color:rgba(255,255,255,.62);max-width:400px}
    .footer .logo-text{color:#fff}
    .footer .logo-text span{color:#7FACFF}
    .footer-links h4{font-size:15px;font-weight:600;color:#fff;margin-bottom:18px;letter-spacing:.5px}
    .footer-links li{margin-bottom:10px}
    .footer-links a{font-size:14px;color:rgba(255,255,255,.7);transition:.25s}
    .footer-links a:hover{color:#7FACFF;padding-left:4px}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:18px 0;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:rgba(255,255,255,.5)}
    /* ---------- responsive ---------- */
    @media (max-width:1100px){
        .header-search{width:170px}
        .header-nav a{padding:9px 10px;font-size:14px}
        .category-layout{grid-template-columns:minmax(0,1fr) 280px;gap:24px}
        .footer-main{grid-template-columns:1.4fr 1fr 1fr;gap:30px}
    }
    @media (max-width:992px){
        .header-nav{
            position:absolute;top:100%;left:16px;right:16px;
            background:#fff;border:1px solid var(--border);border-radius:14px;
            flex-direction:column;align-items:stretch;padding:10px;gap:2px;
            box-shadow:var(--shadow-md);display:none;
        }
        .header-nav.open{display:flex}
        .header-nav a{padding:12px 14px}
        .header-nav a.active{background:#EAF3FF}
        .header-nav a.active::after{display:none}
        .header-search{display:none}
        .menu-toggle{display:flex}
        .header-inner{gap:12px}
        .header .header-inner{justify-content:space-between}
        .header-actions{margin-left:auto}
        .cat-hero .cat-hero-inner{grid-template-columns:1fr}
        .cat-hero-aside{max-width:none;text-align:left;display:flex;align-items:center;gap:14px;padding:16px 18px}
        .cat-hero-aside i{font-size:28px;margin-bottom:0}
        .category-layout{grid-template-columns:1fr}
        .sidebar{position:static}
        .footer-main{grid-template-columns:1fr 1fr}
    }
    @media (max-width:768px){
        .cat-value-grid,.steps-grid,.guide-grid{grid-template-columns:1fr}
        .focus-card{grid-template-columns:1fr}
        .focus-cover{min-height:200px}
        .section-head{flex-direction:column;align-items:flex-start}
        .header-search{display:none}
        .header-nav a{padding:12px 6px}
        .cta-inner{flex-direction:column;align-items:flex-start;justify-content:flex-start}
        .cta-qr{width:100%}
    }
    @media(max-width:520px){
        :root{--section-y:44px}
        .container{padding:0 16px}
        .logo-text{font-size:18px}
        .header .header-inner{height:56px}
        .header-inner{gap:10px}
        .btn{font-size:14px;padding:9px 16px}
        .header-actions .btn{padding:8px 14px;font-size:13px}
        .footer-main{grid-template-columns:1fr}
        .cat-hero h1{font-size:28px}
        .focus-body{padding:22px 18px}
        .sidebar{padding-top:4px}
        .cta-btns .btn{width:100%}
    }