/* roulang page: index */
:root {
      --ink: #eaf1ff;
      --muted: #91a3c2;
      --blue: #55a8ff;
      --cyan: #61e4dc;
      --violet: #9a7cff;
      --night: #07111f;
      --panel: rgba(17, 31, 54, .78);
      --panel-soft: rgba(24, 43, 72, .56);
      --line: rgba(157, 190, 235, .18);
      --radius: 18px;
      --shadow: 0 22px 60px rgba(0, 0, 0, .28);
      --container: 1180px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--night);
      font-family: "Noto Sans SC", system-ui, sans-serif;
      font-size: 16px;
      line-height: 1.75;
      overflow-x: hidden;
    }
    body::before {
      content: "";
      position: fixed;
      inset: 0;
      z-index: -2;
      background:
        radial-gradient(circle at 12% 8%, rgba(66, 139, 255, .18), transparent 30%),
        radial-gradient(circle at 88% 28%, rgba(103, 101, 255, .12), transparent 27%),
        linear-gradient(145deg, #07111f 0%, #0b1830 54%, #07111f 100%);
    }
    body::after {
      content: "";
      position: fixed;
      inset: 0;
      z-index: -1;
      opacity: .22;
      pointer-events: none;
      background-image: linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
      background-size: 48px 48px;
      mask-image: linear-gradient(to bottom, black, transparent 75%);
    }
    a { color: inherit; text-decoration: none; transition: color .25s ease, opacity .25s ease, transform .25s ease; }
    img { max-width: 100%; display: block; }
    button, input { font: inherit; }
    .container { width: min(var(--container), calc(100% - 48px)); margin: 0 auto; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(7, 17, 31, .78);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid var(--line);
    }
    .header-row { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
    .brand { display: inline-flex; align-items: center; gap: 12px; font-size: 18px; font-weight: 800; letter-spacing: 0; white-space: nowrap; }
    .brand-mark {
      width: 36px; height: 36px; display: grid; place-items: center; border-radius: 11px;
      color: #07111f; background: linear-gradient(135deg, var(--cyan), var(--blue));
      box-shadow: 0 0 24px rgba(85, 168, 255, .35);
    }
    .nav-wrap { display: flex; align-items: center; gap: 22px; min-width: 0; }
    .nav-chips { display: flex; align-items: center; gap: 8px; overflow-x: auto; scrollbar-width: none; }
    .nav-chips::-webkit-scrollbar { display: none; }
    .nav-chip {
      flex: 0 0 auto; padding: 7px 16px; color: var(--muted); border: 1px solid transparent; border-radius: 999px;
      font-size: 14px; font-weight: 600;
    }
    .nav-chip:hover, .nav-chip.active { color: var(--ink); background: rgba(85,168,255,.12); border-color: rgba(85,168,255,.3); }
    .header-action { display: inline-flex; align-items: center; gap: 8px; color: var(--cyan); font-size: 14px; font-weight: 700; white-space: nowrap; }
    .header-action:hover { color: #fff; transform: translateX(2px); }

    .hero { padding: 82px 0 92px; }
    .hero-grid { display: grid; grid-template-columns: minmax(0, 1.04fr) minmax(390px, .96fr); gap: 70px; align-items: center; }
    .eyebrow, .section-kicker {
      display: inline-flex; align-items: center; gap: 9px; color: var(--cyan); font-size: 13px; font-weight: 700; letter-spacing: .08em;
    }
    .eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--cyan); }
    h1, h2, h3, p { margin-top: 0; }
    h1 { max-width: 690px; margin: 18px 0 23px; font-size: clamp(42px, 5vw, 74px); line-height: 1.12; letter-spacing: 0; font-weight: 800; }
    .hero-copy { max-width: 650px; color: #b8c7df; font-size: 18px; }
    .button-row { display: flex; flex-wrap: wrap; gap: 13px; margin: 32px 0 34px; }
    .button {
      display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 48px; padding: 0 21px;
      border: 1px solid transparent; border-radius: 12px; font-weight: 700; font-size: 15px; cursor: pointer;
    }
    .button-primary { color: #061321; background: linear-gradient(100deg, var(--cyan), var(--blue)); box-shadow: 0 10px 30px rgba(79, 190, 220, .22); }
    .button-primary:hover { color: #061321; transform: translateY(-2px); box-shadow: 0 15px 34px rgba(79, 190, 220, .36); }
    .button-ghost { color: var(--ink); border-color: var(--line); background: rgba(255,255,255,.04); }
    .button-ghost:hover { border-color: var(--blue); background: rgba(85,168,255,.1); }
    .hero-points { display: flex; flex-wrap: wrap; gap: 24px; color: var(--muted); font-size: 14px; }
    .hero-points strong { display: block; color: var(--ink); font-size: 22px; line-height: 1.25; }

    .hero-stage { position: relative; min-height: 500px; display: flex; align-items: center; justify-content: center; }
    .stage-backdrop { position: absolute; width: 330px; height: 420px; border-radius: 34px; transform: rotate(9deg); background: linear-gradient(150deg, #1d4c7a, #342963 74%); opacity: .7; box-shadow: var(--shadow); }
    .story-panel {
      position: relative; width: min(100%, 350px); min-height: 465px; padding: 25px; border: 1px solid rgba(180, 220, 255, .3);
      border-radius: 28px; overflow: hidden; background: linear-gradient(155deg, rgba(24,55,91,.92), rgba(13,26,51,.94));
      box-shadow: 0 28px 80px rgba(0,0,0,.42); transform: rotate(-3deg);
    }
    .story-panel::before { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 30%, rgba(4,10,20,.88)); }
    .story-art { height: 275px; border-radius: 18px; background: linear-gradient(140deg, #67cdd1 0%, #35649d 36%, #20264f 100%); position: relative; overflow: hidden; }
    .story-art::before, .story-art::after { content: ""; position: absolute; border-radius: 50%; filter: blur(1px); }
    .story-art::before { width: 180px; height: 250px; right: -28px; top: -45px; background: rgba(141, 123, 255, .65); transform: rotate(24deg); }
    .story-art::after { width: 130px; height: 130px; left: -35px; bottom: -35px; background: rgba(97, 228, 220, .6); }
    .story-label { position: relative; z-index: 1; display: inline-block; margin: 11px 0; padding: 4px 10px; border-radius: 999px; color: #dffcff; background: rgba(4,15,31,.42); font-size: 12px; }
    .story-content { position: absolute; right: 25px; bottom: 24px; left: 25px; z-index: 2; }
    .story-content h3 { margin-bottom: 7px; font-size: 24px; line-height: 1.3; }
    .story-content p { margin-bottom: 0; color: #b9c9df; font-size: 14px; }
    .stage-note { position: absolute; right: 0; bottom: 35px; max-width: 180px; padding: 13px 15px; border: 1px solid var(--line); border-radius: 14px; color: #c4d3eb; background: rgba(14,29,51,.82); backdrop-filter: blur(10px); font-size: 13px; box-shadow: var(--shadow); }

    section { padding: 88px 0; }
    .section-heading { max-width: 710px; margin-bottom: 36px; }
    .section-heading h2 { margin: 11px 0 12px; font-size: clamp(29px, 3vw, 44px); line-height: 1.25; }
    .section-heading p { color: var(--muted); margin-bottom: 0; }
    .band { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(15, 29, 50, .45); }
    .entry-grid { display: grid; grid-template-columns: 1.35fr .85fr .85fr; gap: 16px; }
    .entry-card { min-height: 220px; padding: 25px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); transition: transform .25s, border-color .25s, box-shadow .25s; }
    .entry-card.large { min-height: 305px; background: linear-gradient(145deg, rgba(32,69,105,.82), rgba(16,28,53,.86)); }
    .entry-card:hover { transform: translateY(-5px); border-color: rgba(97,228,220,.55); box-shadow: var(--shadow); }
    .entry-icon { width: 42px; height: 42px; display: grid; place-items: center; margin-bottom: 38px; border-radius: 12px; color: var(--cyan); background: rgba(97,228,220,.12); }
    .entry-card h3 { margin-bottom: 8px; font-size: 21px; }
    .entry-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .text-link { display: inline-flex; gap: 8px; align-items: center; margin-top: 19px; color: var(--cyan); font-size: 14px; font-weight: 700; }
    .text-link:hover { color: #fff; gap: 12px; }

    .milestone-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 70px; align-items: start; }
    .quote-mark { color: var(--violet); font-size: 70px; line-height: .8; opacity: .8; }
    .milestone-copy h2 { margin: 15px 0; font-size: 38px; line-height: 1.25; }
    .milestone-copy p { color: var(--muted); }
    .timeline { border-left: 1px solid rgba(97,228,220,.35); }
    .timeline-item { position: relative; padding: 0 0 31px 32px; }
    .timeline-item:last-child { padding-bottom: 0; }
    .timeline-item::before { content: ""; position: absolute; left: -6px; top: 7px; width: 11px; height: 11px; border: 3px solid var(--night); border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 4px rgba(97,228,220,.16); }
    .timeline-date { color: var(--cyan); font-size: 13px; font-weight: 700; }
    .timeline-item h3 { margin: 5px 0 4px; font-size: 19px; }
    .timeline-item p { margin: 0; color: var(--muted); font-size: 14px; }

    .news-layout { display: grid; grid-template-columns: 1.2fr .8fr; gap: 30px; }
    .news-list { border-top: 1px solid var(--line); }
    .news-item { display: flex; align-items: center; justify-content: space-between; gap: 25px; padding: 20px 0; border-bottom: 1px solid var(--line); }
    .news-item h3 { margin: 0 0 5px; font-size: 17px; }
    .news-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .news-date { flex: 0 0 auto; color: var(--muted); font-size: 13px; }
    .recommendation { padding: 28px; border: 1px solid rgba(154,124,255,.32); border-radius: var(--radius); background: linear-gradient(145deg, rgba(57,47,105,.6), rgba(18,31,57,.85)); }
    .recommendation h3 { margin: 15px 0 10px; font-size: 23px; }
    .recommendation p { color: #bbc5dc; font-size: 14px; }
    .tag { display: inline-flex; padding: 5px 10px; border-radius: 999px; color: #dbe3ff; background: rgba(154,124,255,.2); font-size: 12px; }

    .trust-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .trust-item { display: flex; gap: 14px; align-items: flex-start; padding: 21px; border: 1px solid var(--line); border-radius: 15px; background: rgba(16,31,53,.64); }
    .trust-item i { margin-top: 5px; color: var(--cyan); font-size: 20px; }
    .trust-item strong { display: block; margin-bottom: 3px; font-size: 15px; }
    .trust-item span { color: var(--muted); font-size: 13px; }

    .app-section { background: linear-gradient(90deg, rgba(19,48,78,.56), rgba(27,28,69,.48)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
    .app-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: center; }
    .app-layout h2 { margin: 13px 0; font-size: 37px; line-height: 1.3; }
    .app-layout p { max-width: 560px; color: var(--muted); }
    .feature-list { margin: 23px 0 0; padding: 0; list-style: none; color: #cbd8ed; }
    .feature-list li { margin: 9px 0; }
    .feature-list i { width: 22px; color: var(--cyan); }
    .sync-panel { display: grid; grid-template-columns: repeat(2, 1fr); gap: 13px; }
    .sync-cell { min-height: 135px; padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: var(--panel-soft); }
    .sync-cell:nth-child(2) { transform: translateY(22px); }
    .sync-cell i { color: var(--violet); font-size: 21px; }
    .sync-cell strong { display: block; margin-top: 25px; font-size: 15px; }

    .cta { padding: 75px 0; }
    .cta-box { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 38px 42px; border: 1px solid rgba(97,228,220,.35); border-radius: 22px; background: linear-gradient(110deg, rgba(25,72,91,.74), rgba(35,38,83,.7)); box-shadow: var(--shadow); }
    .cta-box h2 { margin: 0 0 8px; font-size: 30px; }
    .cta-box p { margin: 0; color: #c0cee3; }

    footer { padding: 37px 0 25px; border-top: 1px solid var(--line); background: rgba(4,11,21,.7); }
    .footer-row { display: flex; justify-content: space-between; align-items: center; gap: 25px; }
    .footer-brand { font-weight: 800; }
    .footer-meta { color: var(--muted); font-size: 13px; }
    .footer-links { display: flex; gap: 18px; color: var(--muted); font-size: 13px; }
    .footer-links a:hover { color: var(--cyan); }
    .copyright { margin-top: 24px; padding-top: 18px; border-top: 1px solid var(--line); color: #687c9d; font-size: 12px; }

    :focus-visible { outline: 3px solid rgba(97,228,220,.7); outline-offset: 3px; }
    @media (max-width: 1024px) {
      .hero-grid { gap: 38px; }
      .milestone-layout, .app-layout { gap: 40px; }
      .entry-grid { grid-template-columns: 1fr 1fr; }
      .entry-card.large { grid-column: span 2; }
    }
    @media (max-width: 768px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .header-row { min-height: 68px; gap: 12px; }
      .brand { font-size: 15px; }
      .brand-mark { width: 32px; height: 32px; }
      .header-action { display: none; }
      .hero { padding: 58px 0 65px; }
      .hero-grid, .milestone-layout, .news-layout, .app-layout { grid-template-columns: 1fr; }
      h1 { font-size: clamp(38px, 9vw, 58px); }
      .hero-stage { min-height: 430px; margin-top: 15px; }
      section { padding: 65px 0; }
      .trust-row { grid-template-columns: 1fr 1fr; }
      .cta-box { align-items: flex-start; flex-direction: column; padding: 30px 25px; }
    }
    @media (max-width: 520px) {
      .nav-wrap { max-width: 48%; }
      .nav-chips { gap: 2px; }
      .nav-chip { padding: 6px 10px; font-size: 13px; }
      .hero-points { gap: 15px; }
      .hero-points strong { font-size: 19px; }
      .entry-grid, .trust-row, .sync-panel { grid-template-columns: 1fr; }
      .entry-card.large { grid-column: auto; }
      .entry-card, .entry-card.large { min-height: 0; }
      .entry-icon { margin-bottom: 25px; }
      .stage-backdrop { width: 270px; height: 365px; }
      .story-panel { min-height: 405px; }
      .story-art { height: 230px; }
      .stage-note { right: -3px; bottom: 17px; }
      .news-item { align-items: flex-start; flex-direction: column; gap: 5px; }
      .sync-cell:nth-child(2) { transform: none; }
      .footer-row { align-items: flex-start; flex-direction: column; }
    }