/* roulang page: index */
:root {
      --ink: #f4f7fb;
      --muted: #a4afc1;
      --subtle: #758197;
      --bg: #0b0f17;
      --panel: #111824;
      --panel-2: #151f2d;
      --line: rgba(255,255,255,.1);
      --accent: #ff5d55;
      --accent-2: #ffb454;
      --cyan: #57d6ca;
      --white: #ffffff;
      --radius: 18px;
      --shadow: 0 20px 60px rgba(0,0,0,.28);
      --max: 1180px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--bg);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      font-size: 16px;
      line-height: 1.7;
      letter-spacing: 0;
    }
    body, button, input { -webkit-font-smoothing: antialiased; }
    a { color: inherit; text-decoration: none; }
    img { display: block; max-width: 100%; }
    button, input { font: inherit; }
    button { cursor: pointer; }
    :focus-visible { outline: 3px solid rgba(87,214,202,.65); outline-offset: 3px; }
    .container { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--accent-2);
      font-size: 12px;
      font-weight: 800;
      letter-spacing: .12em;
      text-transform: uppercase;
    }
    .eyebrow::before {
      content: "";
      width: 24px;
      height: 2px;
      background: var(--accent);
    }
    h1, h2, h3, p { margin-top: 0; }
    h1, h2, h3 { line-height: 1.18; }
    h1 { max-width: 760px; font-size: clamp(40px, 6vw, 76px); letter-spacing: -.04em; margin-bottom: 24px; }
    h2 { font-size: clamp(30px, 4vw, 48px); letter-spacing: -.03em; margin-bottom: 16px; }
    h3 { font-size: 20px; margin-bottom: 10px; }
    .section { padding: 108px 0; }
    .section-head { max-width: 680px; margin-bottom: 42px; }
    .section-head p { color: var(--muted); margin-bottom: 0; font-size: 17px; }

    .site-header {
      position: fixed;
      z-index: 20;
      top: 0;
      left: 0;
      width: 100%;
      height: 76px;
      border-bottom: 1px solid var(--line);
      background: rgba(11,15,23,.88);
      backdrop-filter: blur(18px);
    }
    .nav-wrap { height: 100%; display: flex; align-items: center; justify-content: space-between; }
    .brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 850; letter-spacing: -.02em; }
    .brand-mark {
      width: 34px;
      height: 34px;
      display: grid;
      place-items: center;
      border-radius: 10px;
      color: var(--white);
      background: var(--accent);
      box-shadow: 0 8px 22px rgba(255,93,85,.28);
      font-size: 14px;
      font-weight: 900;
    }
    .nav-links { display: flex; align-items: center; gap: 8px; }
    .nav-links a {
      color: var(--muted);
      padding: 8px 16px;
      border-radius: 9px;
      transition: .2s ease;
    }
    .nav-links a:hover, .nav-links a.active { color: var(--white); background: rgba(255,255,255,.08); }
    .nav-action, .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      min-height: 46px;
      padding: 0 20px;
      border: 1px solid transparent;
      border-radius: 10px;
      color: var(--white);
      background: var(--accent);
      font-weight: 750;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .nav-action:hover, .button:hover { transform: translateY(-2px); background: #ff7169; box-shadow: 0 12px 26px rgba(255,93,85,.24); }
    .button.secondary { color: var(--ink); background: transparent; border-color: var(--line); }
    .button.secondary:hover { background: rgba(255,255,255,.08); box-shadow: none; }
    .menu-toggle { display: none; border: 0; color: var(--ink); background: transparent; font-size: 25px; }

    .hero {
      position: relative;
      min-height: 720px;
      display: flex;
      align-items: center;
      padding: 150px 0 100px;
      overflow: hidden;
      background:
        radial-gradient(circle at 84% 18%, rgba(255,93,85,.18), transparent 26%),
        radial-gradient(circle at 60% 78%, rgba(87,214,202,.1), transparent 25%),
        #0b0f17;
    }
    .hero::after {
      content: "";
      position: absolute;
      right: -12%;
      bottom: -35%;
      width: 650px;
      height: 650px;
      border: 1px solid rgba(255,255,255,.08);
      border-radius: 50%;
      box-shadow: 0 0 0 55px rgba(255,255,255,.025), 0 0 0 110px rgba(255,255,255,.018);
    }
    .hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(340px, .85fr); gap: 70px; align-items: center; }
    .hero-copy p { max-width: 650px; color: var(--muted); font-size: 19px; }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 32px 0 34px; }
    .hero-facts { display: flex; gap: 30px; flex-wrap: wrap; }
    .fact strong { display: block; font-size: 25px; color: var(--white); }
    .fact span { color: var(--subtle); font-size: 13px; }

    .launch-panel {
      position: relative;
      padding: 30px;
      border: 1px solid var(--line);
      border-radius: 24px;
      background: rgba(17,24,36,.82);
      box-shadow: var(--shadow);
    }
    .panel-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; }
    .status { display: inline-flex; align-items: center; gap: 8px; color: var(--cyan); font-size: 13px; font-weight: 700; }
    .status i { width: 8px; height: 8px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 5px rgba(87,214,202,.12); }
    .countdown { display: grid; grid-template-columns: repeat(4, 1fr); gap: 9px; margin: 25px 0; }
    .time-box { padding: 13px 6px; text-align: center; border: 1px solid var(--line); border-radius: 12px; background: rgba(255,255,255,.035); }
    .time-box strong { display: block; font-size: 25px; color: var(--white); }
    .time-box span { color: var(--subtle); font-size: 11px; }
    .panel-note { color: var(--muted); font-size: 14px; margin-bottom: 22px; }
    .panel-line { height: 1px; margin: 22px 0; background: var(--line); }
    .signal-list { display: grid; gap: 12px; }
    .signal { display: flex; gap: 12px; align-items: flex-start; color: var(--muted); font-size: 14px; }
    .signal b { color: var(--accent-2); font-size: 17px; line-height: 1.3; }

    .light-section { background: #f4f1eb; color: #17202d; }
    .light-section .section-head p { color: #667080; }
    .light-section .eyebrow { color: #c65343; }
    .feature-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 16px; }
    .feature-card {
      min-height: 240px;
      padding: 28px;
      border: 1px solid rgba(23,32,45,.1);
      border-radius: var(--radius);
      background: rgba(255,255,255,.7);
      transition: .25s ease;
    }
    .feature-card:first-child { color: var(--white); background: #202b3a; }
    .feature-card:hover { transform: translateY(-5px); box-shadow: 0 18px 35px rgba(23,32,45,.1); }
    .feature-icon { width: 42px; height: 42px; display: grid; place-items: center; margin-bottom: 32px; border-radius: 12px; color: #17202d; background: var(--accent-2); font-weight: 900; }
    .feature-card p { color: #718093; font-size: 14px; }
    .feature-card:first-child p { color: #c1cbd5; }

    .dark-section { background: var(--panel); }
    .activity-band { display: grid; grid-template-columns: 1fr 1fr; gap: 25px; align-items: stretch; }
    .activity-copy { padding: 38px; border-radius: var(--radius); background: #182333; }
    .activity-copy p { color: var(--muted); }
    .benefit-list { display: grid; gap: 12px; margin: 28px 0 0; padding: 0; list-style: none; }
    .benefit-list li { display: flex; gap: 12px; color: #dce5ee; }
    .benefit-list li::before { content: "✓"; color: var(--cyan); font-weight: 900; }
    .combo-stack { display: grid; gap: 12px; }
    .combo {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      padding: 23px 25px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: rgba(255,255,255,.035);
      transition: .2s ease;
    }
    .combo:hover { border-color: rgba(255,180,84,.55); background: rgba(255,180,84,.06); }
    .combo small { display: block; color: var(--subtle); }
    .combo strong { display: block; margin-top: 5px; color: var(--white); }
    .combo em { color: var(--accent-2); font-style: normal; font-weight: 800; white-space: nowrap; }

    .rail { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .topic-card { position: relative; min-height: 270px; overflow: hidden; padding: 22px; display: flex; align-items: flex-end; border-radius: 16px; background: #202c3a; }
    .topic-card:nth-child(2) { background: #3b2932; }
    .topic-card:nth-child(3) { background: #213b3a; }
    .topic-card:nth-child(4) { background: #3b3526; }
    .topic-card::before { content: ""; position: absolute; top: 26px; right: 24px; width: 84px; height: 84px; border: 1px solid rgba(255,255,255,.3); border-radius: 50%; }
    .topic-card::after { content: ""; position: absolute; top: 46px; right: 44px; width: 44px; height: 44px; border: 1px solid rgba(255,255,255,.25); border-radius: 50%; }
    .topic-content { position: relative; z-index: 1; }
    .topic-content span { color: var(--accent-2); font-size: 12px; font-weight: 800; }
    .topic-content h3 { margin: 7px 0; }
    .topic-content p { margin: 0; color: #c0cad3; font-size: 14px; }

    .news-layout { display: grid; grid-template-columns: 1.2fr .8fr; gap: 45px; }
    .news-list { border-top: 1px solid var(--line); }
    .news-item { display: flex; justify-content: space-between; gap: 20px; padding: 22px 0; border-bottom: 1px solid var(--line); }
    .news-item h3 { font-size: 17px; margin: 0; }
    .news-item p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }
    .news-item time { color: var(--subtle); font-size: 12px; white-space: nowrap; }
    .news-aside { padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255,255,255,.035); }
    .news-aside h3 { color: var(--accent-2); }
    .news-aside p { color: var(--muted); font-size: 14px; }
    .tag-row { display: flex; flex-wrap: wrap; gap: 8px; }
    .tag { display: inline-flex; padding: 6px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: 12px; }

    .entry-section { background: #f4f1eb; color: #17202d; }
    .entry-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 55px; align-items: center; }
    .entry-section .section-head p { color: #667080; }
    .entry-form { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
    .entry-form input { min-width: 0; padding: 0 16px; border: 1px solid #d7d4ce; border-radius: 10px; color: #17202d; background: #fff; }
    .entry-form input::placeholder { color: #9299a2; }
    .privacy { margin: 12px 0 0; color: #858b93; font-size: 12px; }

    .faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 35px; }
    details { border-bottom: 1px solid var(--line); }
    summary { padding: 20px 28px 20px 0; position: relative; color: var(--white); font-weight: 700; cursor: pointer; list-style: none; }
    summary::-webkit-details-marker { display: none; }
    summary::after { content: "+"; position: absolute; right: 3px; color: var(--accent-2); font-size: 22px; font-weight: 400; }
    details[open] summary::after { content: "−"; }
    details p { margin: 0 0 20px; color: var(--muted); font-size: 14px; }

    .cta { padding: 75px 0; background: #202b3a; }
    .cta-box { display: flex; align-items: center; justify-content: space-between; gap: 25px; }
    .cta h2 { margin-bottom: 8px; }
    .cta p { margin: 0; color: #b9c4cf; }

    footer { padding: 40px 0 28px; border-top: 1px solid var(--line); background: #080b11; }
    .footer-top { display: flex; justify-content: space-between; gap: 30px; align-items: flex-start; }
    .footer-brand p { max-width: 330px; margin: 16px 0 0; color: var(--subtle); font-size: 13px; }
    .footer-links { display: flex; gap: 22px; color: var(--muted); font-size: 14px; }
    .footer-links a:hover { color: var(--white); }
    .copyright { display: flex; justify-content: space-between; gap: 20px; margin-top: 38px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--subtle); font-size: 12px; }

    @media (max-width: 1024px) {
      .hero-grid { gap: 35px; }
      .feature-grid { grid-template-columns: 1fr 1fr; }
      .feature-card:first-child { grid-column: span 2; }
      .rail { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .container { width: min(var(--max), calc(100% - 34px)); }
      .section { padding: 78px 0; }
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        padding: 12px 17px 18px;
        border-bottom: 1px solid var(--line);
        background: #0b0f17;
      }
      .nav-links.open { display: grid; }
      .nav-links a { padding: 12px 14px; }
      .nav-action { display: none; }
      .hero { min-height: auto; padding: 130px 0 75px; }
      .hero-grid, .activity-band, .news-layout, .entry-grid { grid-template-columns: 1fr; }
      .hero-grid { gap: 42px; }
      .launch-panel { max-width: 600px; }
      .cta-box, .footer-top, .copyright { flex-direction: column; align-items: flex-start; }
      .faq-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 520px) {
      h1 { font-size: 42px; }
      h2 { font-size: 32px; }
      .hero-copy p { font-size: 16px; }
      .hero-actions { display: grid; }
      .hero-actions .button { width: 100%; }
      .hero-facts { gap: 18px; }
      .feature-grid, .rail { grid-template-columns: 1fr; }
      .feature-card:first-child { grid-column: auto; }
      .feature-card { min-height: 210px; }
      .activity-copy { padding: 26px; }
      .entry-form { grid-template-columns: 1fr; }
      .entry-form .button { width: 100%; }
      .news-item { display: block; }
      .news-item time { display: block; margin-top: 8px; }
      .footer-links { flex-wrap: wrap; gap: 12px 18px; }
    }