/* roulang page: index */
:root {
      --ink: #e9f2ff;
      --muted: #91a6c4;
      --deep: #07111f;
      --panel: rgba(14, 31, 54, .72);
      --panel-strong: #102846;
      --line: rgba(141, 181, 224, .18);
      --cyan: #59d8e8;
      --blue: #5e8bff;
      --lime: #b6ef79;
      --radius: 18px;
      --shadow: 0 22px 70px rgba(0, 0, 0, .28);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      background: var(--deep);
      color: var(--ink);
      font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      letter-spacing: 0;
      overflow-x: hidden;
    }
    a { color: inherit; text-decoration: none; }
    img { display: block; max-width: 100%; }
    button, input { font: inherit; }
    button { cursor: pointer; }
    .container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
    .site-header {
      position: sticky; top: 0; z-index: 20;
      background: rgba(7, 17, 31, .86);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(18px);
    }
    .brand-row { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
    .brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: .02em; }
    .brand-mark {
      width: 38px; height: 38px; display: grid; place-items: center;
      border: 1px solid rgba(89,216,232,.55); border-radius: 12px;
      color: var(--cyan); background: rgba(89,216,232,.08);
      box-shadow: 0 0 28px rgba(89,216,232,.14);
    }
    .brand-name { font-size: 17px; }
    .header-note { color: var(--muted); font-size: 13px; }
    .channel-row { border-top: 1px solid rgba(141,181,224,.1); overflow-x: auto; }
    .channel-nav { display: flex; gap: 8px; min-height: 48px; align-items: center; white-space: nowrap; }
    .channel-nav a {
      padding: 5px 15px; border-radius: 999px; color: var(--muted); font-size: 13px;
      transition: .2s ease;
    }
    .channel-nav a:hover, .channel-nav a.active { color: var(--deep); background: var(--cyan); }
    .section { padding: 96px 0; position: relative; }
    .hero {
      min-height: 650px; display: flex; align-items: center;
      background:
        radial-gradient(circle at 82% 24%, rgba(94,139,255,.22), transparent 32%),
        radial-gradient(circle at 14% 18%, rgba(89,216,232,.12), transparent 28%),
        var(--deep);
    }
    .hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 72px; align-items: center; }
    .eyebrow, .kicker {
      color: var(--cyan); font-size: 12px; letter-spacing: .16em; text-transform: uppercase; font-weight: 800;
    }
    h1 { margin-top: 16px; max-width: 720px; font-size: clamp(38px, 5vw, 68px); line-height: 1.13; letter-spacing: -.03em; }
    .hero-copy { max-width: 650px; color: #b8c9df; font-size: 17px; margin-top: 24px; }
    .actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
    .btn {
      min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      padding: 0 20px; border-radius: 12px; border: 1px solid transparent; font-size: 14px; font-weight: 800;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .btn:hover { transform: translateY(-2px); }
    .btn:focus-visible, a:focus-visible, input:focus-visible, summary:focus-visible { outline: 3px solid var(--lime); outline-offset: 3px; }
    .btn-primary { color: #06121c; background: var(--cyan); box-shadow: 0 0 26px rgba(89,216,232,.25); }
    .btn-primary:hover { background: #8beaf2; box-shadow: 0 0 36px rgba(89,216,232,.42); }
    .btn-ghost { border-color: var(--line); color: var(--ink); background: rgba(255,255,255,.035); }
    .btn-ghost:hover { border-color: rgba(89,216,232,.55); background: rgba(89,216,232,.08); }
    .hero-stats { display: flex; flex-wrap: wrap; gap: 28px; margin-top: 38px; }
    .stat strong { display: block; font-size: 25px; color: var(--lime); line-height: 1.2; }
    .stat span { color: var(--muted); font-size: 12px; }
    .rank-panel {
      padding: 26px; border: 1px solid var(--line); border-radius: 24px; background: var(--panel);
      box-shadow: var(--shadow); backdrop-filter: blur(20px); transform: rotate(1deg);
    }
    .panel-top { display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); padding-bottom: 18px; }
    .panel-top h2 { font-size: 17px; }
    .live-dot { color: var(--lime); font-size: 12px; }
    .rank-item { display: grid; grid-template-columns: 32px 1fr auto; gap: 12px; align-items: center; padding: 17px 0; border-bottom: 1px solid var(--line); }
    .rank-item:last-child { border-bottom: 0; padding-bottom: 3px; }
    .rank-no { color: var(--cyan); font-size: 18px; font-weight: 800; }
    .rank-title { font-size: 14px; font-weight: 700; }
    .rank-meta { color: var(--muted); font-size: 11px; display: block; }
    .rank-tag { color: var(--lime); font-size: 11px; }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 34px; }
    .section h2 { font-size: clamp(26px, 3vw, 40px); line-height: 1.25; letter-spacing: -.02em; }
    .section-intro { max-width: 600px; color: var(--muted); font-size: 15px; }
    .light-section { background: #0a192b; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
    .feature-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 16px; }
    .feature { min-height: 235px; padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); transition: .25s ease; }
    .feature:hover, .content-card:hover { transform: translateY(-5px); border-color: rgba(89,216,232,.5); box-shadow: 0 16px 40px rgba(0,0,0,.2); }
    .feature-large { background: linear-gradient(145deg, rgba(89,216,232,.16), rgba(16,40,70,.72)); }
    .feature-icon { font-size: 28px; color: var(--lime); margin-bottom: 22px; }
    .feature h3 { font-size: 19px; margin-bottom: 10px; }
    .feature p, .content-card p { color: var(--muted); font-size: 14px; }
    .time-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .time-card { padding: 22px 20px; border-left: 3px solid var(--cyan); background: rgba(16,40,70,.6); border-radius: 0 14px 14px 0; }
    .time-card b { display: block; color: var(--lime); font-size: 24px; margin-bottom: 8px; }
    .time-card span { color: var(--muted); font-size: 13px; }
    .content-layout { display: grid; grid-template-columns: 1.35fr .65fr; gap: 36px; }
    .content-list { border-top: 1px solid var(--line); }
    .content-card { display: grid; grid-template-columns: 110px 1fr; gap: 20px; align-items: center; padding: 20px 0; border-bottom: 1px solid var(--line); transition: .2s ease; }
    .content-thumb { height: 78px; border-radius: 12px; background: linear-gradient(135deg, #1e486a, #10223b); display: grid; place-items: center; color: var(--cyan); font-weight: 800; font-size: 12px; }
    .content-card h3 { font-size: 16px; margin-bottom: 4px; }
    .content-card h3 a:hover { color: var(--cyan); }
    .side-box { padding: 25px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(16,40,70,.48); }
    .side-box h3 { font-size: 18px; margin-bottom: 18px; }
    .side-list li { list-style: none; padding: 13px 0; border-bottom: 1px solid var(--line); color: #c8d7e9; font-size: 13px; }
    .side-list li:last-child { border-bottom: 0; }
    .side-list em { color: var(--cyan); font-style: normal; margin-right: 9px; }
    .guide-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .guide-item { padding: 24px; background: #0d2037; border: 1px solid var(--line); border-radius: var(--radius); }
    .guide-number { color: var(--cyan); font-size: 13px; font-weight: 900; }
    .guide-item h3 { margin: 14px 0 8px; font-size: 18px; }
    .guide-item p { color: var(--muted); font-size: 14px; }
    .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
    details { border: 1px solid var(--line); border-radius: 13px; background: rgba(16,40,70,.5); padding: 18px 20px; }
    summary { cursor: pointer; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 15px; }
    summary::after { content: "+"; color: var(--cyan); font-size: 20px; line-height: 1; }
    details[open] summary::after { content: "−"; }
    details p { color: var(--muted); font-size: 13px; margin-top: 13px; }
    .cta-section { padding: 70px 0; }
    .cta-box { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 28px; padding: 38px 42px; border: 1px solid rgba(89,216,232,.36); border-radius: 24px; background: linear-gradient(110deg, rgba(89,216,232,.13), rgba(94,139,255,.15)); }
    .cta-box p { color: #b8c9df; margin-top: 8px; max-width: 680px; font-size: 14px; }
    .site-footer { border-top: 1px solid var(--line); padding: 34px 0 24px; color: var(--muted); font-size: 12px; }
    .footer-row { display: flex; justify-content: space-between; align-items: center; gap: 20px; }
    .footer-brand { color: var(--ink); font-weight: 800; }
    .footer-note { margin-top: 22px; padding-top: 18px; border-top: 1px solid rgba(141,181,224,.1); }
    @media (max-width: 1024px) {
      .hero-grid { gap: 38px; }
      .feature-grid { grid-template-columns: 1fr 1fr; }
      .feature-large { grid-column: span 2; }
      .time-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .container { width: min(100% - 28px, 620px); }
      .header-note { display: none; }
      .hero { min-height: auto; padding: 72px 0; }
      .hero-grid, .content-layout, .cta-box { grid-template-columns: 1fr; }
      .rank-panel { transform: none; }
      .section { padding: 68px 0; }
      .section-head { display: block; }
      .section-intro { margin-top: 12px; }
      .guide-grid { grid-template-columns: 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
      .cta-box { padding: 28px; }
    }
    @media (max-width: 520px) {
      h1 { font-size: 38px; }
      .brand-name { font-size: 14px; }
      .feature-grid, .time-grid { grid-template-columns: 1fr; }
      .feature-large { grid-column: auto; }
      .content-card { grid-template-columns: 84px 1fr; gap: 13px; }
      .content-thumb { height: 68px; }
      .footer-row { align-items: flex-start; flex-direction: column; }
      .actions .btn { width: 100%; }
    }