/* roulang page: index */
:root {
      --blue: #2768d8;
      --blue-dark: #194da8;
      --blue-soft: #eaf2ff;
      --green: #17876e;
      --orange: #bd672c;
      --ink: #17243a;
      --muted: #68768b;
      --line: #e1e8f0;
      --paper: #ffffff;
      --bg: #f5f8fc;
      --radius: 10px;
      --shadow: 0 8px 24px rgba(26, 57, 102, .07);
      --max: 1160px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 88px; }
    body {
      margin: 0; color: var(--ink); background: var(--bg);
      font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    a { color: inherit; text-decoration: none; }
    button, input { font: inherit; }
    button { cursor: pointer; }
    img { display: block; max-width: 100%; }
    :focus-visible { outline: 3px solid rgba(39,104,216,.38); outline-offset: 3px; }
    .container { width: min(var(--max), calc(100% - 48px)); margin-inline: auto; }
    .skip-link { position: absolute; top: -60px; left: 16px; z-index: 99; padding: 8px 12px; background: #fff; }
    .skip-link:focus { top: 12px; }
    .site-header {
      position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.96);
      border-bottom: 1px solid var(--line); backdrop-filter: blur(12px);
    }
    .nav-wrap { min-height: 76px; display: flex; align-items: center; gap: 28px; }
    .brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; font-weight: 800; }
    .brand-mark {
      width: 40px; height: 40px; display: grid; place-items: center; color: #fff;
      border-radius: 8px; background: var(--blue); font-size: 18px;
    }
    .brand-name { max-width: 240px; line-height: 1.25; font-size: 16px; }
    .nav-links { display: flex; align-items: center; gap: 23px; margin-left: auto; }
    .nav-links a { color: #536177; font-size: 14px; transition: color .18s ease; }
    .nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--blue); }
    .nav-actions { display: flex; align-items: center; gap: 10px; }
    .search-form { display: flex; align-items: center; border: 1px solid var(--line); border-radius: 7px; background: #fff; }
    .search-form input { width: 140px; padding: 8px 10px; border: 0; outline: 0; color: var(--ink); background: transparent; }
    .search-form button { padding: 8px 11px; border: 0; color: var(--blue); background: transparent; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 7px; background: #fff; color: var(--ink); }
    .btn {
      min-height: 44px; display: inline-flex; justify-content: center; align-items: center;
      gap: 8px; padding: 10px 17px; border: 1px solid transparent; border-radius: 7px;
      font-weight: 700; transition: background .18s ease, box-shadow .18s ease, transform .18s ease;
    }
    .btn:hover { transform: translateY(-1px); }
    .btn-primary { color: #fff; background: var(--blue); box-shadow: 0 5px 12px rgba(39,104,216,.18); }
    .btn-primary:hover { background: var(--blue-dark); }
    .btn-outline { color: var(--blue); border-color: #b9cdef; background: #fff; }
    .btn-outline:hover { background: var(--blue-soft); }
    .hero {
      position: relative; overflow: hidden; color: #fff; background: #183d70;
      min-height: 510px; display: flex; align-items: center;
    }
    .hero::before, .hero::after { content: ""; position: absolute; pointer-events: none; }
    .hero::before {
      inset: 0 0 0 48%;
      background:
        linear-gradient(90deg, #183d70 0%, rgba(24,61,112,.2) 44%, rgba(24,61,112,.06) 100%),
        linear-gradient(135deg, #5388c9, #285d9b 48%, #93b7ce);
    }
    .hero::after {
      width: 38%; height: 68%; right: 9%; top: 16%;
      border: 1px solid rgba(255,255,255,.3);
      background: linear-gradient(155deg, rgba(255,255,255,.16), rgba(255,255,255,.035));
      box-shadow: 24px 20px 0 rgba(13,42,79,.18);
      transform: rotate(2deg);
    }
    .hero-inner { position: relative; z-index: 1; padding-block: 72px; }
    .hero-copy { max-width: 660px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 17px; color: #cfe0ff; font-size: 14px; }
    .eyebrow::before { content: ""; width: 22px; height: 2px; background: #78d2bd; }
    h1 { max-width: 640px; margin: 0 0 10px; font-size: clamp(36px, 4vw, 54px); line-height: 1.2; }
    .hero-subtitle { margin: 0 0 14px; color: #dce9ff; font-size: 21px; }
    .hero-copy p { max-width: 650px; margin: 0; color: #e0e9f5; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
    .hero .btn-outline { color: #fff; border-color: rgba(255,255,255,.55); background: rgba(255,255,255,.08); }
    .hero .btn-outline:hover { background: rgba(255,255,255,.17); }
    .hero-note { margin-top: 23px; color: #c8d9f0; font-size: 13px; }
    main { overflow: clip; }
    .section { padding: 76px 0; border-bottom: 1px solid var(--line); }
    .section-white { background: var(--paper); }
    .section-soft { background: #f0f5fb; }
    .section-head { max-width: 720px; margin-bottom: 32px; }
    .section-kicker { margin: 0 0 7px; color: var(--blue); font-size: 13px; font-weight: 800; }
    h2 { margin: 0; font-size: 30px; line-height: 1.3; }
    .section-head > p:last-child { margin: 12px 0 0; color: var(--muted); }
    .index-strip { display: grid; grid-template-columns: 1.2fr 1fr 1fr 1fr; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }
    .index-item { min-height: 112px; padding: 20px 22px; border-right: 1px solid var(--line); }
    .index-item:last-child { border: 0; }
    .index-item strong { display: block; margin-bottom: 4px; font-size: 17px; }
    .index-item span { color: var(--muted); font-size: 14px; }
    .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; }
    .step { position: relative; padding: 8px 24px 8px 0; }
    .step:not(:last-child)::after { content: ""; position: absolute; left: 43px; right: 8px; top: 23px; height: 1px; background: #b8cae3; }
    .step-num { position: relative; z-index: 1; width: 46px; height: 46px; display: grid; place-items: center; margin-bottom: 14px; border-radius: 50%; color: var(--blue); border: 1px solid #c6d7ef; background: #fff; font-weight: 800; }
    .step h3 { margin: 0 0 5px; font-size: 17px; }
    .step p { margin: 0; color: var(--muted); font-size: 14px; }
    .stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .stat { padding: 22px; border-left: 3px solid var(--blue); background: #fff; }
    .stat strong { display: block; color: var(--blue-dark); font-size: 30px; line-height: 1.2; }
    .stat span { color: var(--muted); font-size: 14px; }
    .notice { margin-top: 17px; color: var(--muted); font-size: 13px; }
    .feedback { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
    .quote { padding: 24px 26px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
    .quote blockquote { margin: 0 0 14px; font-size: 17px; }
    .quote cite { color: var(--muted); font-size: 13px; font-style: normal; }
    .tags { display: flex; flex-wrap: wrap; gap: 10px; }
    .tag { padding: 9px 15px; border: 1px solid #d5e1ef; border-radius: 5px; color: #3c536d; background: #fff; }
    .tag:nth-child(3n+2) { border-color: #c9e6dd; background: #f2fbf8; }
    .content-tools { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin: 0 0 22px; }
    .content-tools p { margin: 0; color: var(--muted); font-size: 14px; }
    .cards { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
    .media-card { overflow: hidden; border: 1px solid var(--line); border-radius: 8px; background: #fff; box-shadow: 0 4px 14px rgba(26,57,102,.045); transition: transform .18s ease, box-shadow .18s ease; }
    .media-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
    .poster { position: relative; aspect-ratio: 3 / 4; display: flex; align-items: end; overflow: hidden; padding: 17px; color: #fff; background: linear-gradient(145deg, #8daecc, #3f6e99 55%, #213f65); }
    .poster::before { content: ""; position: absolute; width: 70%; height: 105%; top: -17%; right: -12%; border: 1px solid rgba(255,255,255,.28); transform: rotate(20deg); }
    .poster::after { content: ""; position: absolute; width: 55%; height: 80%; top: 16%; right: 17%; border: 1px solid rgba(255,255,255,.24); transform: rotate(-12deg); }
    .poster.tone-2 { background: linear-gradient(145deg, #95b7b6, #477c82 55%, #28565e); }
    .poster.tone-3 { background: linear-gradient(145deg, #b9a6a0, #826b78 55%, #53465f); }
    .poster.tone-4 { background: linear-gradient(145deg, #94a6c4, #5c6e99 55%, #34496e); }
    .poster.tone-5 { background: linear-gradient(145deg, #bbad88, #827b59 55%, #4e5847); }
    .poster.tone-6 { background: linear-gradient(145deg, #8ea9aa, #526e7d 55%, #354c5f); }
    .poster-label { position: relative; z-index: 1; max-width: 90%; font-size: 19px; font-weight: 800; line-height: 1.35; }
    .badge { position: absolute; top: 11px; left: 11px; z-index: 2; padding: 4px 8px; border-radius: 4px; color: #fff; background: rgba(20,48,82,.76); font-size: 11px; font-weight: 700; }
    .badge-green { background: #167a68; }
    .card-info { padding: 13px 14px 15px; }
    .card-info h3 { margin: 0 0 5px; font-size: 15px; }
    .card-meta { display: flex; justify-content: space-between; gap: 8px; color: var(--muted); font-size: 12px; }
    .card-meta strong { color: #95611f; }
    .recommend-grid { display: grid; grid-template-columns: 1.25fr 1fr 1fr; gap: 16px; }
    .feature-card { min-height: 250px; display: flex; flex-direction: column; justify-content: end; position: relative; overflow: hidden; padding: 22px; color: #fff; border-radius: 8px; background: linear-gradient(145deg, #5d8fb6, #345e8c 58%, #23466f); }
    .feature-card::before { content: ""; position: absolute; inset: 12% 15% 22% 45%; border: 1px solid rgba(255,255,255,.35); transform: rotate(9deg); }
    .feature-card.large { min-height: 320px; }
    .feature-card:nth-child(2) { background: linear-gradient(145deg, #6d9c91, #3e716c 58%, #2a5557); }
    .feature-card:nth-child(3) { background: linear-gradient(145deg, #ab8b78, #79676d 58%, #4f4a5b); }
    .feature-card h3, .feature-card p, .feature-card span { position: relative; z-index: 1; }
    .feature-card h3 { margin: 0 0 6px; font-size: 21px; }
    .feature-card p { margin: 0; color: rgba(255,255,255,.83); font-size: 14px; }
    .feature-card span { align-self: flex-start; margin-bottom: auto; padding: 4px 8px; border: 1px solid rgba(255,255,255,.45); border-radius: 4px; font-size: 12px; }
    .channel-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 36px; border-top: 1px solid var(--line); }
    .channel { display: grid; grid-template-columns: 125px 1fr; gap: 18px; align-items: start; padding: 20px 0; border-bottom: 1px solid var(--line); }
    .channel h3 { margin: 0; font-size: 17px; }
    .channel p { margin: 0; color: var(--muted); font-size: 14px; }
    .rank-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--line); }
    .rank-table th, .rank-table td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line); }
    .rank-table th { color: #52647c; background: #f3f7fc; font-size: 13px; }
    .rank-table td { font-size: 14px; }
    .rank-num { width: 54px; color: var(--blue); font-size: 17px !important; font-weight: 800; }
    .rank-label { display: inline-block; padding: 3px 7px; border-radius: 4px; color: #39725f; background: #edf8f4; font-size: 12px; }
    .news-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .news-item { display: grid; grid-template-columns: 108px 1fr; gap: 14px; padding: 14px; border-bottom: 1px solid var(--line); background: #fff; }
    .news-thumb { aspect-ratio: 4 / 3; display: grid; place-items: center; color: #fff; background: linear-gradient(145deg, #83a9c8, #3f6587); font-weight: 800; }
    .news-item:nth-child(3n+2) .news-thumb { background: linear-gradient(145deg, #9bb9ae, #537c73); }
    .news-item:nth-child(3n) .news-thumb { background: linear-gradient(145deg, #ba9d91, #816b78); }
    .news-item h3 { margin: 2px 0 7px; font-size: 15px; line-height: 1.45; }
    .news-item time { color: var(--muted); font-size: 12px; }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-list details { border-bottom: 1px solid var(--line); background: #fff; }
    .faq-list summary { position: relative; padding: 18px 46px 18px 18px; cursor: pointer; list-style: none; font-weight: 700; }
    .faq-list summary::-webkit-details-marker { display: none; }
    .faq-list summary::after { content: "+"; position: absolute; right: 18px; top: 50%; color: var(--blue); font-size: 22px; transform: translateY(-50%); }
    .faq-list details[open] summary::after { content: "−"; }
    .faq-list details[open] { box-shadow: inset 3px 0 var(--blue); }
    .faq-answer { margin: 0; padding: 0 18px 18px; color: var(--muted); }
    .closing { padding: 36px 0; color: #fff; background: #214d7d; }
    .closing-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
    .closing h2 { font-size: 24px; }
    .closing p { margin: 6px 0 0; color: #d5e4f5; }
    .closing .btn { flex: 0 0 auto; color: #194da8; background: #fff; }
    .site-footer { padding: 48px 0 20px; background: #fff; }
    .footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; padding-bottom: 32px; }
    .footer-brand p { max-width: 310px; color: var(--muted); font-size: 14px; }
    .footer-col h3 { margin: 0 0 12px; font-size: 15px; }
    .footer-col a, .footer-col p { display: block; margin: 7px 0; color: var(--muted); font-size: 14px; }
    .footer-col a:hover { color: var(--blue); }
    .copyright { padding-top: 17px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
    .mobile-nav { display: contents; }
    .empty-state { display: none; padding: 26px; text-align: center; color: var(--muted); border: 1px dashed #b8c7d9; }
    @media (max-width: 1023px) {
      .nav-wrap { gap: 14px; }
      .nav-links { gap: 14px; }
      .search-form input { width: 100px; }
      .cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
      .news-list { grid-template-columns: repeat(2, 1fr); }
      .hero::before { inset-left: 38%; }
      .footer-grid { grid-template-columns: 1.2fr 1fr 1fr; }
    }
    @media (max-width: 767px) {
      html { scroll-padding-top: 70px; }
      .container { width: min(100% - 32px, var(--max)); }
      .nav-wrap { min-height: 66px; justify-content: space-between; }
      .brand-name { max-width: 205px; font-size: 14px; }
      .brand-mark { width: 37px; height: 37px; }
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav-actions { margin-left: auto; }
      .search-form { display: none; }
      .mobile-nav {
        display: none; position: absolute; top: 66px; left: 0; right: 0; padding: 12px 16px 18px;
        border-bottom: 1px solid var(--line); background: #fff; box-shadow: var(--shadow);
      }
      .mobile-nav.is-open { display: block; }
      .nav-links { display: grid; grid-template-columns: 1fr 1fr; gap: 0; margin: 0; }
      .nav-links a { padding: 12px 8px; border-bottom: 1px solid #eef2f7; }
      .hero { min-height: 480px; }
      .hero::before { inset: 0; opacity: .42; }
      .hero::after { width: 46%; height: 44%; right: -2%; top: 8%; opacity: .55; }
      .hero-inner { padding-block: 60px; }
      h1 { font-size: 38px; }
      .hero-subtitle { font-size: 18px; }
      .section { padding: 56px 0; }
      h2 { font-size: 25px; }
      .index-strip { grid-template-columns: 1fr 1fr; }
      .index-item { border-bottom: 1px solid var(--line); }
      .index-item:nth-child(2) { border-right: 0; }
      .index-item:nth-child(3), .index-item:nth-child(4) { border-bottom: 0; }
      .steps { grid-template-columns: 1fr 1fr; gap: 22px 8px; }
      .step:not(:last-child)::after { display: none; }
      .stats { grid-template-columns: 1fr 1fr; }
      .feedback { grid-template-columns: 1fr; }
      .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
      .recommend-grid { grid-template-columns: 1fr 1fr; }
      .feature-card.large { grid-column: 1 / -1; min-height: 250px; }
      .feature-card { min-height: 220px; padding: 17px; }
      .channel-list { grid-template-columns: 1fr; }
      .channel { grid-template-columns: 105px 1fr; }
      .rank-table thead { display: none; }
      .rank-table, .rank-table tbody, .rank-table tr, .rank-table td { display: block; width: 100%; }
      .rank-table tr { position: relative; padding: 12px 12px 12px 48px; border-bottom: 1px solid var(--line); }
      .rank-table td { display: inline-block; width: auto; padding: 3px 7px; border: 0; font-size: 13px; }
      .rank-table td:first-child { position: absolute; top: 13px; left: 9px; padding: 2px; }
      .rank-table td:nth-child(2) { display: block; padding-bottom: 5px; font-weight: 700; }
      .news-list { grid-template-columns: 1fr; gap: 0; }
      .closing-inner { align-items: flex-start; flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; gap: 22px; }
    }
    @media (max-width: 520px) {
      .container { width: calc(100% - 28px); }
      .brand-name { max-width: 185px; }
      .hero { min-height: 490px; }
      h1 { font-size: 34px; }
      .hero-copy p { font-size: 14px; }
      .hero-actions .btn { flex: 1 1 100%; }
      .section-head { margin-bottom: 24px; }
      .index-item { padding: 16px 13px; }
      .index-item strong { font-size: 15px; }
      .index-item span { font-size: 12px; }
      .cards { gap: 9px; }
      .poster { padding: 12px; }
      .poster-label { font-size: 16px; }
      .card-info { padding: 11px; }
      .card-info h3 { font-size: 14px; }
      .card-meta { font-size: 11px; }
      .recommend-grid { grid-template-columns: 1fr; }
      .feature-card.large { grid-column: auto; }
      .channel { grid-template-columns: 1fr; gap: 4px; }
      .content-tools { align-items: flex-start; flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; gap: 18px; }
      .footer-brand { grid-column: 1 / -1; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
    }