/* roulang page: index */
:root {
      --c-archive: #0A1B33;
      --c-steel: #153A66;
      --c-search: #2FE0C8;
      --c-approve: #5AB0FF;
      --c-bg0: #070D18;
      --c-bg1: #0E1A2E;
      --c-text: #E8EEF7;
      --c-muted: #A9B8CC;
      --c-line: rgba(255,255,255,.12);
      --c-danger: #F07178;
      --r-sm: 10px;
      --r-md: 16px;
      --r-lg: 20px;
      --shadow-card: 0 12px 32px rgba(2,8,20,.35), inset 0 1px 0 rgba(255,255,255,.1);
      --shadow-glow: 0 8px 24px rgba(47,224,200,.28), inset 0 1px 0 rgba(255,255,255,.28);
      --space-section: 104px;
      --container: 1240px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    html, body { margin: 0; padding: 0; }
    body {
      font-family: "Noto Sans SC", "Source Han Sans SC", sans-serif;
      font-size: 16px;
      line-height: 1.75;
      color: var(--c-text);
      background: linear-gradient(180deg, var(--c-bg0) 0%, var(--c-bg1) 52%, #091525 100%);
      overflow-x: hidden;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font-family: inherit; }
    button { cursor: pointer; }
    h1, h2, h3, h4 { margin: 0; letter-spacing: .02em; line-height: 1.28; color: var(--c-text); }
    h1 { font-size: 46px; font-weight: 700; }
    h2 { font-size: 30px; font-weight: 700; }
    h3 { font-size: 21px; font-weight: 600; }
    p { margin: 0; color: var(--c-muted); }
    ul { margin: 0; padding: 0; list-style: none; }
    table { border-collapse: collapse; width: 100%; }
    :focus-visible {
      outline: 2px solid var(--c-search);
      outline-offset: 3px;
    }
    .skip-link {
      position: absolute; left: -999px; top: 8px; z-index: 80;
      background: var(--c-search); color: #072018; padding: 8px 14px; border-radius: 8px;
    }
    .skip-link:focus { left: 12px; }
    .container {
      width: min(100% - 48px, var(--container));
      margin: 0 auto;
    }
    .paper-grid { position: relative; }
    .paper-grid::before {
      content: "";
      position: absolute; inset: 0; pointer-events: none; opacity: .45;
      background-image:
        linear-gradient(rgba(90,176,255,.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(90,176,255,.045) 1px, transparent 1px);
      background-size: 32px 32px;
      mask-image: linear-gradient(180deg, transparent, #000 12%, #000 88%, transparent);
    }
    .paper-noise { position: relative; }
    .paper-noise::after {
      content: "";
      position: absolute; inset: 0; pointer-events: none; opacity: .045;
      background-image: radial-gradient(rgba(232,238,247,.7) .6px, transparent .7px);
      background-size: 4px 4px;
    }
    .site-header {
      position: sticky; top: 0; z-index: 50;
      background: rgba(7,13,24,.72);
      backdrop-filter: blur(16px) saturate(140%);
      border-bottom: 1px solid var(--c-line);
      transition: background .3s ease, box-shadow .3s ease, border-color .3s ease;
    }
    .site-header.is-compact .topbar { display: none; }
    .site-header.is-compact { background: rgba(7,13,24,.9); box-shadow: 0 10px 30px rgba(0,0,0,.28); }
    .topbar {
      display: flex; align-items: center; justify-content: space-between;
      min-height: 42px; gap: 16px;
      border-bottom: 1px solid rgba(255,255,255,.06);
      font-size: 13px; color: var(--c-muted);
    }
    .brand {
      display: inline-flex; align-items: center; gap: 10px; color: var(--c-text); font-weight: 700; letter-spacing: .04em;
    }
    .brand-mark {
      width: 32px; height: 32px; border-radius: 9px; display: grid; place-items: center;
      background: linear-gradient(160deg, rgba(90,176,255,.28), rgba(47,224,200,.18));
      border: 1px solid rgba(255,255,255,.16);
      box-shadow: 0 0 16px rgba(47,224,200,.18);
    }
    .top-meta { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; justify-content: flex-end; }
    .top-meta a:hover { color: var(--c-search); }
    .trust-chip {
      display: inline-flex; align-items: center; gap: 6px;
      padding: 3px 10px; border-radius: 999px;
      border: 1px solid rgba(47,224,200,.35); color: var(--c-search); background: rgba(47,224,200,.08);
    }
    .nav-row {
      display: flex; align-items: center; justify-content: space-between; gap: 18px; min-height: 64px;
    }
    .nav-links { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
    .nav-links a {
      position: relative; padding: 10px 12px; border-radius: 10px; color: var(--c-muted); font-size: 14px; font-weight: 500;
      min-height: 44px; display: inline-flex; align-items: center;
      transition: color .2s ease, background .2s ease;
    }
    .nav-links a:hover, .nav-links a.is-active { color: var(--c-text); background: rgba(90,176,255,.1); }
    .nav-links a.is-active::after {
      content: ""; position: absolute; left: 12px; right: 12px; bottom: 6px; height: 2px;
      background: linear-gradient(90deg, var(--c-approve), var(--c-search)); border-radius: 2px;
    }
    .nav-cta { display: flex; align-items: center; gap: 10px; }
    .menu-toggle {
      display: none; width: 44px; height: 44px; border-radius: 12px;
      border: 1px solid var(--c-line); background: rgba(18,42,78,.55); color: var(--c-text);
    }
    .menu-toggle span, .menu-toggle span::before, .menu-toggle span::after {
      display: block; width: 18px; height: 2px; background: currentColor; border-radius: 2px; position: relative;
    }
    .menu-toggle span::before, .menu-toggle span::after { content: ""; position: absolute; left: 0; }
    .menu-toggle span::before { top: -6px; }
    .menu-toggle span::after { top: 6px; }
    .drawer {
      position: fixed; inset: 0 0 0 auto; width: min(86vw, 360px); background: rgba(8,16,30,.96);
      border-left: 1px solid var(--c-line); transform: translateX(110%);
      transition: transform .28s ease; z-index: 70; padding: 22px 18px 32px;
      display: flex; flex-direction: column; gap: 10px;
    }
    .drawer.open { transform: translateX(0); }
    .drawer-backdrop {
      position: fixed; inset: 0; background: rgba(0,0,0,.45); opacity: 0; pointer-events: none; z-index: 60; transition: opacity .28s ease;
    }
    .drawer-backdrop.open { opacity: 1; pointer-events: auto; }
    .drawer a {
      min-height: 48px; display: flex; align-items: center; padding: 0 12px; border-radius: 12px; color: var(--c-text);
      background: rgba(18,42,78,.35);
    }
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      min-height: 46px; padding: 0 18px; border-radius: 12px; font-weight: 600; font-size: 14px;
      border: 1px solid transparent; transition: transform .2s ease, box-shadow .2s ease, filter .2s ease, background .2s ease;
    }
    .btn:active { transform: translateY(1px); }
    .btn-glow {
      color: #062018;
      background: linear-gradient(90deg, #5AB0FF 0%, #2FE0C8 100%);
      box-shadow: var(--shadow-glow), 0 0 0 1px rgba(47,224,200,.25);
    }
    .btn-glow:hover { filter: brightness(1.08); box-shadow: 0 10px 30px rgba(47,224,200,.42), inset 0 1px 0 rgba(255,255,255,.4); transform: translateY(-2px); }
    .btn-ghost {
      color: var(--c-text); background: rgba(18,42,78,.45); border-color: rgba(255,255,255,.16);
      backdrop-filter: blur(12px);
    }
    .btn-ghost:hover { border-color: rgba(47,224,200,.5); box-shadow: 0 0 18px rgba(47,224,200,.18); transform: translateY(-2px); }
    .section { position: relative; padding: var(--space-section) 0; }
    .section-tight { padding: 72px 0; }
    .kicker {
      display: inline-flex; align-items: center; gap: 8px; color: var(--c-search); font-size: 13px; font-weight: 600; letter-spacing: .12em;
      margin-bottom: 12px;
    }
    .lead { max-width: 760px; margin-top: 14px; font-size: 16px; }
    .glass {
      background: linear-gradient(180deg, rgba(255,255,255,.08), rgba(18,42,78,.55));
      backdrop-filter: blur(16px) saturate(140%);
      border: 1px solid rgba(255,255,255,.12);
      border-radius: 18px;
      box-shadow: var(--shadow-card);
      transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
    }
    .glass:hover {
      transform: translateY(-5px);
      border-color: rgba(90,176,255,.42);
      box-shadow: 0 16px 36px rgba(2,8,20,.4), 0 0 18px rgba(90,176,255,.18);
    }
    .hero {
      position: relative; min-height: 78vh; display: grid; place-items: stretch; overflow: hidden;
    }
    .hero-slide {
      position: absolute; inset: 0; opacity: 0; pointer-events: none;
      background-size: cover; background-position: center;
      transition: opacity .7s ease;
    }
    .hero-slide.is-on { opacity: 1; pointer-events: auto; }
    .hero-slide::before {
      content: ""; position: absolute; inset: 0;
      background: linear-gradient(90deg, rgba(7,13,24,.86) 0%, rgba(10,27,51,.62) 48%, rgba(7,13,24,.35) 100%);
    }
    .hero-folder {
      position: absolute; right: 8%; bottom: 8%; width: min(38vw, 420px); height: 280px; opacity: .28; pointer-events: none;
      border: 1px solid rgba(255,255,255,.16); border-radius: 18px 18px 14px 14px;
      background: linear-gradient(180deg, rgba(90,176,255,.16), rgba(10,27,51,.2));
    }
    .hero-folder::before {
      content: ""; position: absolute; left: 18px; top: -16px; width: 120px; height: 18px; border-radius: 8px 8px 0 0;
      background: rgba(47,224,200,.25); border: 1px solid rgba(255,255,255,.12); border-bottom: 0;
    }
    .hero-inner { position: relative; z-index: 2; padding: 86px 0 72px; }
    .promo-burst {
      display: inline-flex; align-items: center; gap: 8px; margin-bottom: 16px;
      padding: 6px 12px 6px 8px; border-radius: 999px;
      background: rgba(47,224,200,.12); border: 1px solid rgba(47,224,200,.4); color: var(--c-search); font-size: 13px; font-weight: 700;
      box-shadow: 0 0 18px rgba(47,224,200,.18);
    }
    .burst-dot {
      width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center;
      background: linear-gradient(140deg, #5AB0FF, #2FE0C8); color: #062018; font-size: 11px;
    }
    .hero h1, .hero-copy h2 { max-width: 18em; }
    .hero-copy p { max-width: 42em; margin-top: 16px; color: #d5deea; }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 26px; }
    .hero-controls {
      position: absolute; z-index: 3; left: 0; right: 0; bottom: 24px;
      display: flex; align-items: center; justify-content: space-between;
    }
    .pager { display: flex; gap: 8px; }
    .pager button {
      width: 36px; height: 8px; border-radius: 99px; border: 0; background: rgba(255,255,255,.22);
    }
    .pager button.is-on { width: 54px; background: linear-gradient(90deg, #5AB0FF, #2FE0C8); }
    .arrow {
      width: 44px; height: 44px; border-radius: 50%; border: 1px solid rgba(255,255,255,.16);
      background: rgba(18,42,78,.5); color: var(--c-text); backdrop-filter: blur(12px);
    }
    .pain-rail { display: grid; grid-template-columns: 1.1fr 1fr; gap: 18px; }
    .pain-item {
      display: grid; grid-template-columns: 88px 1fr; gap: 14px; align-items: center; padding: 16px;
    }
    .pain-code { font-variant-numeric: tabular-nums; color: var(--c-approve); font-size: 13px; letter-spacing: .16em; }
    .split { display: grid; grid-template-columns: 5fr 7fr; gap: 36px; align-items: center; }
    .split-rev { grid-template-columns: 7fr 5fr; }
    .cover {
      border-radius: 20px; overflow: hidden; border: 1px solid rgba(255,255,255,.12);
      box-shadow: 0 18px 40px rgba(0,0,0,.28);
    }
    .cover img { width: 100%; height: 100%; object-fit: cover; min-height: 320px; }
    .timeline {
      display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; counter-reset: step;
    }
    .step {
      position: relative; padding: 22px 18px; min-height: 180px;
    }
    .step::before {
      counter-increment: step; content: counter(step, decimal-leading-zero);
      display: block; color: var(--c-search); font-weight: 700; font-variant-numeric: tabular-nums; margin-bottom: 10px;
    }
    .ability-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .icon-line {
      width: 40px; height: 40px; margin-bottom: 14px; color: var(--c-approve);
    }
    .ability-grid li { color: var(--c-muted); font-size: 14px; padding-left: 14px; position: relative; margin-top: 6px; }
    .ability-grid li::before {
      content: ""; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; border-radius: 50%; background: var(--c-search);
    }
    .module-grid { display: grid; grid-template-columns: 1.15fr .85fr .85fr; gap: 18px; }
    .module-card img { width: 100%; height: 210px; object-fit: cover; border-radius: 14px; }
    .module-card.featured { box-shadow: 0 0 0 1px rgba(47,224,200,.45), 0 0 24px rgba(47,224,200,.16); }
    .dark-band {
      background: linear-gradient(180deg, #06101d, #0a1c34);
      border-block: 1px solid rgba(255,255,255,.08);
    }
    .quote-xl { font-size: 28px; line-height: 1.45; color: var(--c-text); }
    .stats {
      display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px;
    }
    .stat-num {
      font-size: 34px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--c-search);
    }
    .story-grid { display: grid; grid-template-columns: 1.4fr .8fr; gap: 18px; }
    .mini-story { display: grid; gap: 14px; }
    .review-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .stars { color: #2FE0C8; letter-spacing: 2px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 22px; }
    .tag {
      padding: 6px 12px; border-radius: 999px; border: 1px solid rgba(255,255,255,.12);
      background: rgba(21,58,102,.35); color: var(--c-text); font-size: 13px;
    }
    .scene-matrix { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .compare { width: 100%; overflow: auto; }
    .compare th, .compare td { padding: 12px 14px; text-align: left; border-bottom: 1px solid rgba(255,255,255,.08); font-size: 14px; }
    .compare th { color: var(--c-search); font-weight: 600; }
    .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .meter { height: 8px; border-radius: 99px; background: rgba(255,255,255,.08); overflow: hidden; }
    .meter > i { display: block; height: 100%; background: linear-gradient(90deg, #5AB0FF, #2FE0C8); }
    .faq-item { margin-bottom: 10px; overflow: hidden; }
    .faq-item button {
      width: 100%; text-align: left; background: transparent; border: 0; color: var(--c-text);
      padding: 18px 18px; font-size: 16px; font-weight: 600; display: flex; justify-content: space-between; gap: 12px;
      min-height: 56px;
    }
    .faq-item.is-open { box-shadow: inset 0 2px 0 #2FE0C8; }
    .faq-item .ans { display: none; padding: 0 18px 18px; color: var(--c-muted); }
    .faq-item.is-open .ans { display: block; }
    .cta-box { display: grid; grid-template-columns: 1.05fr .95fr; gap: 28px; align-items: stretch; }
    .field { display: grid; gap: 6px; margin-bottom: 14px; }
    .field label { font-size: 13px; color: var(--c-muted); }
    .field input, .field select, .field textarea {
      min-height: 46px; border-radius: 12px; border: 1px solid rgba(255,255,255,.14);
      background: rgba(12,28,52,.65); color: var(--c-text); padding: 10px 12px;
    }
    .field input:focus, .field select:focus, .field textarea:focus {
      border-color: var(--c-search); box-shadow: 0 0 0 3px rgba(47,224,200,.15);
    }
    .form-alert { padding: 10px 12px; border-radius: 10px; margin-bottom: 12px; font-size: 14px; }
    .form-alert.ok { background: rgba(47,224,200,.12); color: var(--c-search); }
    .form-alert.err { background: rgba(240,113,120,.12); color: var(--c-danger); }
    .site-footer {
      padding: 56px 0 28px; border-top: 1px solid rgba(255,255,255,.08);
      background: #070d18; color: var(--c-muted); font-size: 14px;
    }
    .foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.1fr; gap: 24px; margin-bottom: 28px; }
    .foot-grid a:hover { color: var(--c-search); }
    .copy { border-top: 1px solid rgba(255,255,255,.06); padding-top: 16px; font-size: 13px; }
    .local-flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .cover-world { display: grid; grid-template-columns: 1.2fr .8fr; gap: 18px; }
    .partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .a11y-bar { font-size: 13px; color: var(--c-muted); padding: 10px 0 0; }
    @media (max-width: 1280px) {
      h1 { font-size: 42px; }
      .module-grid, .review-grid, .news-grid, .stats { grid-template-columns: repeat(3, 1fr); }
      .review-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 1024px) {
      :root { --space-section: 88px; }
      h1 { font-size: 36px; }
      .nav-links { display: none; }
      .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
      .split, .split-rev, .pain-rail, .story-grid, .cta-box, .cover-world, .foot-grid { grid-template-columns: 1fr; }
      .timeline, .ability-grid, .module-grid, .stats, .scene-matrix, .news-grid, .partner-grid, .local-flow { grid-template-columns: 1fr 1fr; }
      .hero { min-height: 640px; }
    }
    @media (max-width: 768px) {
      .container { width: min(100% - 32px, var(--container)); }
      .top-meta span.hide-sm { display: none; }
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .timeline, .ability-grid, .module-grid, .stats, .scene-matrix, .news-grid, .review-grid, .partner-grid, .local-flow { grid-template-columns: 1fr; }
      .hero { min-height: 560px; }
      .hero-inner { padding-top: 54px; }
      .quote-xl { font-size: 22px; }
    }
    @media (max-width: 520px) {
      .hero-actions, .nav-cta .btn-ghost { width: 100%; }
      .pain-item { grid-template-columns: 1fr; }
    }