/* roulang page: index */
:root {
      --bg-night: #12151A;
      --bg-deep: #0B0D10;
      --bg-mist: #F3F4F6;
      --accent: #1EC8B0;
      --accent-2: #2EE0C5;
      --titanium: #C4B8A5;
      --warm: #F7F4EE;
      --amber: #D97706;
      --amber-2: #F59E0B;
      --text: #1A1D22;
      --text-muted: #5C616A;
      --text-on-dark: #F7F4EE;
      --line: rgba(196, 184, 165, 0.35);
      --line-dark: rgba(30, 200, 176, 0.35);
      --card: #FFFcf7;
      --radius: 10px;
      --radius-sm: 8px;
      --shadow: 0 6px 0 rgba(18, 21, 26, 0.12);
      --shadow-hard: 0 8px 0 rgba(0, 0, 0, 0.28);
      --space: 24px;
      --container: 1180px;
      --nav-h: 70px;
      --top-h: 42px;
      --font: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --mono: "DIN Alternate", "Roboto Mono", "SF Mono", ui-monospace, monospace;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    html, body { margin: 0; padding: 0; max-width: 100%; overflow-x: hidden; }
    body {
      font-family: var(--font);
      font-size: 17px;
      line-height: 1.8;
      color: var(--text);
      background: var(--bg-mist);
      font-weight: 400;
    }
    img { max-width: 100%; height: auto; display: block; border: 0; }
    a { color: var(--accent); text-decoration: none; transition: color .2s ease, opacity .2s ease; }
    a:hover { color: var(--accent-2); }
    button, input, select, textarea { font-family: inherit; }
    button { cursor: pointer; border: 0; background: none; }
    h1, h2, h3 { font-weight: 700; line-height: 1.28; margin: 0 0 .55em; letter-spacing: .02em; }
    h1 { font-size: clamp(28px, 4vw, 46px); }
    h2 { font-size: clamp(22px, 2.4vw, 32px); }
    h3 { font-size: 18px; font-weight: 500; }
    p { margin: 0 0 1em; }
    :focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
    .container { width: min(var(--container), calc(100% - 40px)); margin: 0 auto; }
    .skip { position: absolute; left: -999px; }
    .badge {
      display: inline-flex; align-items: center; gap: 6px;
      height: 30px; padding: 0 12px; border-radius: 8px;
      border: 1px solid var(--titanium); color: var(--titanium);
      font-size: 12px; letter-spacing: .08em; background: rgba(18, 21, 26, .35);
    }
    .badge-light { background: #fff; color: #3b4038; border-color: var(--titanium); }
    .btn {
      display: inline-flex; align-items: center; justify-content: center;
      min-height: 48px; padding: 0 22px; border-radius: 8px;
      font-size: 15px; font-weight: 700; letter-spacing: .04em;
      transition: transform .18s ease, filter .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease, border-color .18s ease;
      text-decoration: none; white-space: nowrap;
    }
    .btn-primary { background: var(--amber); color: #1A1208; box-shadow: 0 4px 0 #8a4d04; }
    .btn-primary:hover { filter: brightness(1.1); color: #1A1208; box-shadow: 0 5px 0 #8a4d04, 0 0 0 1px rgba(247, 244, 238, .35) inset; }
    .btn-primary:active { transform: translateY(2px); box-shadow: 0 2px 0 #8a4d04; }
    .btn-ghost { background: transparent; color: var(--warm); border: 1px solid var(--accent); }
    .btn-ghost:hover { background: rgba(30, 200, 176, .12); color: #fff; filter: brightness(1.1); }
    .btn-ghost:active { transform: translateY(1px); }
    .btn-dark { background: var(--bg-night); color: var(--warm); border: 1px solid var(--titanium); }
    .btn-dark:hover { border-color: var(--accent); color: #fff; filter: brightness(1.08); }
    .lamp {
      display: flex; align-items: center; gap: 12px; margin-bottom: 14px;
      color: var(--accent); font-size: 13px; letter-spacing: .18em; font-weight: 500;
    }
    .lamp::before { content: ""; width: 28px; height: 4px; background: var(--accent); border-radius: 1px; box-shadow: 8px 0 0 var(--titanium); }
    .section { padding: 88px 0; position: relative; }
    .section-dark { background: var(--bg-deep); color: var(--text-on-dark); }
    .section-night { background: var(--bg-night); color: var(--text-on-dark); }
    .section-mist { background: var(--bg-mist); color: var(--text); }
    .section-warm { background: var(--warm); color: var(--text); }
    .lead { font-size: 17px; line-height: 1.82; max-width: 760px; color: inherit; opacity: .92; margin-bottom: 1.2em; }
    .section-dark .lead, .section-night .lead { color: rgba(247, 244, 238, .82); }
    .section-mist .lead, .section-warm .lead { color: var(--text-muted); }
    .grid { display: grid; gap: 20px; }
    .card {
      background: var(--card); border: 1px solid var(--titanium);
      border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden;
      transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
    }
    .card:hover { transform: translateY(-4px); border-bottom: 2px solid var(--accent); box-shadow: var(--shadow-hard); }
    .card-dark {
      background: #16191f; border: 1px solid var(--line-dark); color: var(--warm); box-shadow: none;
    }
    .card-dark:hover { border-color: var(--accent); }
    .site-header { position: relative; z-index: 50; }
    .topbar {
      height: var(--top-h); background: #ECE8E0; color: #3d3a34;
      display: flex; align-items: center; font-size: 13px;
    }
    .topbar .container { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
    .topbar a { color: #3d3a34; min-height: 32px; display: inline-flex; align-items: center; }
    .topbar a:hover { color: #0e7f70; }
    .top-links { display: flex; gap: 18px; flex-wrap: wrap; }
    .navbar {
      height: var(--nav-h); background: var(--bg-night); color: var(--warm);
      display: flex; align-items: center; border-bottom: 1px solid transparent;
    }
    .navbar .container { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
    .logo {
      display: flex; flex-direction: column; justify-content: center; color: var(--warm); min-height: 44px;
      line-height: 1.15;
    }
    .logo strong { font-size: 18px; letter-spacing: .12em; }
    .logo span { font-size: 11px; color: var(--titanium); letter-spacing: .28em; }
    .logo:hover { color: #fff; }
    .nav-links { display: flex; align-items: center; gap: 4px; }
    .nav-links a {
      color: var(--warm); min-height: 44px; padding: 0 12px; display: inline-flex; align-items: center;
      font-size: 14px; border-radius: 8px;
    }
    .nav-links a:hover, .nav-links a.is-active { color: var(--accent); background: rgba(30, 200, 176, .08); }
    .nav-cta { margin-left: 8px; }
    .nav-toggle {
      display: none; width: 44px; height: 44px; border: 1px solid var(--titanium); border-radius: 8px;
      align-items: center; justify-content: center; flex-direction: column; gap: 5px;
    }
    .nav-toggle span { width: 18px; height: 2px; background: var(--warm); display: block; }
    .site-header.is-stuck .navbar {
      position: fixed; left: 0; right: 0; top: 0; z-index: 80;
      background: rgba(18, 21, 26, .88); border-bottom: 1px solid var(--titanium);
    }
    .drawer {
      position: fixed; inset: 0; background: rgba(11, 13, 16, .96); z-index: 90;
      display: none; flex-direction: column; padding: 24px 22px 40px; color: var(--warm);
    }
    .drawer.is-open { display: flex; }
    .drawer-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 28px; }
    .drawer nav { display: flex; flex-direction: column; gap: 8px; }
    .drawer nav a {
      color: var(--warm); min-height: 48px; display: flex; align-items: center;
      border-bottom: 1px solid rgba(196, 184, 165, .2); font-size: 18px;
    }
    .drawer .meta { margin-top: 24px; color: var(--titanium); font-size: 14px; line-height: 1.9; }
    .hero { position: relative; min-height: 88vh; background: var(--bg-deep); color: var(--warm); overflow: hidden; }
    .hero-slides { position: absolute; inset: 0; }
    .hero-slide { position: absolute; inset: 0; opacity: 0; transition: opacity .5s ease; }
    .hero-slide.is-active { opacity: 1; z-index: 1; }
    .hero-slide img { width: 100%; height: 100%; object-fit: cover; }
    .hero-mask {
      position: absolute; inset: 0;
      background: linear-gradient(180deg, rgba(11,13,16,.28) 0%, rgba(11,13,16,.42) 42%, rgba(11,13,16,.88) 100%);
    }
    .hero-grid {
      position: relative; z-index: 2; min-height: 88vh; padding: 48px 0 72px;
      display: grid; grid-template-columns: 1.2fr .8fr; gap: 28px; align-items: end;
    }
    .hero-copy { max-width: 720px; }
    .hero-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
    .hero-qualify {
      margin: 18px 0 24px; padding: 14px 16px; border-left: 4px solid var(--accent);
      background: rgba(18, 21, 26, .45); border-radius: 0 8px 8px 0; color: rgba(247,244,238,.88); font-size: 14px;
    }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero-panel {
      background: rgba(18, 21, 26, .72); border: 1px solid var(--line-dark);
      border-radius: 12px; padding: 22px; backdrop-filter: blur(0);
    }
    .hero-panel h3 { color: var(--warm); margin-bottom: 8px; }
    .hero-panel p { color: rgba(247,244,238,.78); font-size: 14px; }
    .hero-panel ul { margin: 0 0 16px; padding-left: 18px; color: var(--titanium); font-size: 14px; }
    .hero-nav-btn {
      position: absolute; top: 50%; z-index: 3; width: 44px; height: 44px; border-radius: 8px;
      border: 1px solid var(--titanium); color: var(--warm); background: rgba(18,21,26,.45);
    }
    .hero-prev { left: 16px; }
    .hero-next { right: 16px; }
    .hero-nav-btn:hover { border-color: var(--accent); color: var(--accent); }
    .hero-dots { position: absolute; left: 0; right: 0; bottom: 18px; z-index: 3; display: flex; justify-content: center; gap: 8px; }
    .hero-dots button {
      width: 10px; height: 10px; border-radius: 2px; background: rgba(247,244,238,.35); min-height: 10px;
    }
    .hero-dots button.is-on { background: var(--accent); width: 22px; }
    .split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 40px; align-items: center; }
    .split img { width: 100%; height: 460px; object-fit: cover; border-radius: 12px; border: 1px solid var(--titanium); }
    .spec-list { list-style: none; padding: 0; margin: 0 0 20px; }
    .spec-list li {
      display: grid; grid-template-columns: 92px 1fr; gap: 10px; padding: 10px 0;
      border-bottom: 1px solid rgba(196,184,165,.35); font-size: 15px;
    }
    .spec-list b { color: #0e7f70; font-weight: 500; }
    .feature-wrap { display: grid; grid-template-columns: 240px 1fr; gap: 24px; }
    .feature-tabs { display: flex; flex-direction: column; gap: 8px; }
    .feature-tabs button {
      min-height: 52px; text-align: left; padding: 0 16px; border-radius: 8px;
      border: 1px solid transparent; background: #fff; color: var(--text); font-weight: 500;
    }
    .feature-tabs button.is-on, .feature-tabs button:hover {
      border-color: var(--accent); color: #0b7d6e; box-shadow: inset 4px 0 0 var(--accent);
    }
    .feature-pane { display: none; background: #fff; border: 1px solid var(--titanium); border-radius: 12px; padding: 28px; }
    .feature-pane.is-on { display: block; }
    .feature-pane ul { margin: 0; padding-left: 18px; color: var(--text-muted); }
    .feature-pane li { margin: 8px 0; }
    .scene-rail { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .scene-card { cursor: pointer; position: relative; min-height: 280px; padding: 0; text-align: left; color: var(--warm); }
    .scene-card img { width: 100%; height: 280px; object-fit: cover; }
    .scene-card figcaption {
      position: absolute; left: 0; right: 0; bottom: 0; padding: 18px;
      background: linear-gradient(180deg, transparent, rgba(11,13,16,.9));
    }
    .scene-card.is-on, .scene-card:hover { outline: 2px solid var(--accent); outline-offset: 0; }
    .scene-note {
      margin-top: 18px; padding: 16px 18px; background: #fff; border: 1px solid var(--titanium); border-radius: 10px;
      color: var(--text-muted); min-height: 72px;
    }
    .demo-stage { position: relative; overflow: hidden; border-radius: 12px; border: 1px solid var(--line-dark); }
    .demo-track { display: flex; transition: transform .5s ease; }
    .demo-item { min-width: 100%; position: relative; }
    .demo-item img { width: 100%; height: 460px; object-fit: cover; }
    .demo-item p {
      position: absolute; left: 20px; right: 20px; bottom: 18px; margin: 0;
      background: rgba(11,13,16,.72); padding: 12px 14px; border-left: 4px solid var(--accent); border-radius: 0 8px 8px 0;
    }
    .demo-ctrl { display: flex; justify-content: flex-end; gap: 8px; margin-top: 12px; }
    .demo-ctrl button, .pack-ctrl button {
      width: 44px; height: 44px; border: 1px solid var(--titanium); color: var(--warm); border-radius: 8px;
    }
    .adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .adv-card { padding: 22px; min-height: 210px; }
    .adv-card svg { margin-bottom: 12px; }
    .adv-card p { color: var(--text-muted); font-size: 15px; margin: 0; }
    .type-track {
      display: flex; gap: 10px; overflow-x: auto; padding-bottom: 12px; margin-bottom: 18px; scrollbar-width: thin;
    }
    .type-track a {
      flex: 0 0 auto; min-height: 44px; padding: 0 16px; display: inline-flex; align-items: center;
      border: 1px solid var(--titanium); border-radius: 8px; color: var(--text); background: #fff; font-size: 14px;
    }
    .type-track a:hover { border-color: var(--accent); color: #0b7d6e; }
    .model-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .model-card img { width: 100%; height: 230px; object-fit: cover; }
    .model-body { padding: 16px 16px 18px; }
    .model-body ul { margin: 0 0 14px; padding-left: 18px; color: var(--text-muted); font-size: 14px; }
    .case-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 36px; align-items: start; }
    .quote {
      font-size: clamp(22px, 2.6vw, 34px); line-height: 1.45; font-weight: 700; margin: 0 0 18px;
    }
    .case-item {
      padding: 18px 0; border-top: 1px solid rgba(196,184,165,.25);
    }
    .case-item h3 { color: var(--warm); }
    .case-item p { color: rgba(247,244,238,.78); margin: 0; font-size: 15px; }
    .pack-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .pack {
      background: #16191f; border: 1px solid rgba(196,184,165,.25); border-radius: 12px; padding: 22px; color: var(--warm);
    }
    .pack.is-hot { border: 1px solid var(--accent); box-shadow: 0 0 0 1px rgba(30,200,176,.25); }
    .pack .price { font-family: var(--mono); font-size: 28px; color: var(--amber-2); margin: 8px 0 14px; }
    .pack .price small { font-size: 13px; color: var(--titanium); margin-left: 4px; }
    .pack ul { list-style: none; padding: 0; margin: 0 0 18px; color: rgba(247,244,238,.8); font-size: 14px; }
    .pack li { padding: 8px 0; border-bottom: 1px dashed rgba(196,184,165,.2); }
    .story-grid { display: grid; grid-template-columns: 1.3fr .7fr; gap: 16px; }
    .story-side { display: grid; gap: 16px; }
    .story-card { position: relative; overflow: hidden; }
    .story-card img { width: 100%; height: 100%; object-fit: cover; min-height: 180px; }
    .story-card .txt {
      position: absolute; left: 0; right: 0; bottom: 0; padding: 16px;
      background: linear-gradient(180deg, transparent, rgba(11,13,16,.92)); color: var(--warm);
    }
    .story-main img { height: 420px; }
    .stats {
      display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
      background: var(--warm); border-top: 1px solid var(--titanium); border-bottom: 1px solid var(--titanium);
    }
    .stat { padding: 36px 12px; text-align: center; }
    .stat b { display: block; font-family: var(--mono); font-size: 36px; color: #12151A; line-height: 1.1; }
    .stat span { display: block; margin-top: 8px; color: var(--text-muted); font-size: 14px; }
    .rank-bar {
      display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 22px;
    }
    .rank {
      background: #fff; border: 1px solid var(--titanium); border-radius: 10px; padding: 14px 16px;
    }
    .rank strong { display: block; font-size: 22px; color: var(--amber); }
    .review-wall { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .review { padding: 18px; min-height: 180px; position: relative; }
    .review::before { content: "“"; position: absolute; top: 6px; left: 12px; font-size: 36px; color: var(--titanium); line-height: 1; }
    .stars { color: var(--amber); letter-spacing: 2px; font-size: 13px; margin: 8px 0; }
    .review p { font-size: 14px; color: var(--text-muted); margin: 0 0 10px; }
    .review .meta { font-size: 12px; color: #7a7468; }
    .review:nth-child(odd) { background: #fff; }
    .review:nth-child(even) { background: #16191f; color: var(--warm); border-color: var(--line-dark); }
    .review:nth-child(even) p, .review:nth-child(even) .meta { color: rgba(247,244,238,.78); }
    .voice-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .voice { padding: 24px; min-height: 240px; }
    .voice p { font-size: 16px; line-height: 1.85; }
    .who { display: flex; align-items: center; gap: 10px; margin-top: 16px; font-size: 13px; color: var(--titanium); }
    .avatar {
      width: 44px; height: 44px; border-radius: 8px; background: linear-gradient(135deg, var(--accent), #0b4f47);
      display: inline-flex; align-items: center; justify-content: center; color: #fff; font-weight: 700;
    }
    .news-list { display: grid; gap: 14px; }
    .news-item {
      display: grid; grid-template-columns: 220px 1fr; gap: 18px; background: #fff;
      border: 1px solid var(--titanium); border-radius: 10px; overflow: hidden;
      transition: transform .2s ease, border-color .2s ease;
    }
    .news-item:hover { transform: translateY(-4px); border-bottom: 2px solid var(--accent); }
    .news-item img { width: 100%; height: 140px; object-fit: cover; }
    .news-body { padding: 14px 16px 14px 0; }
    .news-body time { color: #8a8376; font-size: 12px; }
    .news-body p { font-size: 14px; color: var(--text-muted); margin: 6px 0 0; }
    .more-link { display: inline-flex; min-height: 44px; align-items: center; margin-top: 10px; font-weight: 500; }
    .faq-item { border-bottom: 1px solid rgba(196,184,165,.35); }
    .faq-item button {
      width: 100%; min-height: 56px; display: flex; justify-content: space-between; align-items: center;
      text-align: left; font-size: 16px; font-weight: 500; color: var(--text); padding: 12px 0;
    }
    .faq-item button span { color: var(--accent); transition: transform .2s ease; }
    .faq-item.is-open button span { transform: rotate(90deg); }
    .faq-item .ans { display: none; color: var(--text-muted); padding: 0 0 16px; font-size: 15px; }
    .faq-item.is-open .ans { display: block; }
    .cta-box {
      display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: center;
      background: linear-gradient(90deg, rgba(18,21,26,.82), rgba(18,21,26,.55)), url("/assets/images/62fe85766db1916f.webp") center/cover;
      border: 1px solid var(--line-dark); border-radius: 12px; padding: 32px;
      box-shadow: inset 4px 0 0 var(--accent);
    }
    .form { display: grid; gap: 12px; }
    .form label { font-size: 13px; color: var(--titanium); }
    .form input, .form select {
      width: 100%; height: 48px; border-radius: 8px; border: 1px solid var(--titanium);
      background: #0f1217; color: var(--warm); padding: 0 12px; font-size: 15px;
    }
    .form input:focus, .form select:focus { border-color: var(--accent); }
    .form-ok { display: none; padding: 18px; border: 1px solid var(--accent); border-radius: 8px; color: var(--accent); }
    .form-ok.is-show { display: block; }
    .site-footer { background: #08090b; color: rgba(247,244,238,.78); padding: 48px 0 24px; font-size: 14px; }
    .foot-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: 24px; margin-bottom: 28px; }
    .site-footer h3 { color: var(--warm); font-size: 16px; }
    .site-footer a { color: rgba(247,244,238,.78); display: inline-flex; min-height: 32px; align-items: center; }
    .site-footer a:hover { color: var(--accent); }
    .copy { border-top: 1px solid rgba(196,184,165,.2); padding-top: 16px; color: #8c877c; font-size: 12px; }
    .ico { width: 28px; height: 28px; stroke: var(--accent); fill: none; stroke-width: 1.6; }
    @media (max-width: 1280px) {
      .container { width: min(1080px, calc(100% - 36px)); }
      .hero-grid { grid-template-columns: 1fr .85fr; }
    }
    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .nav-toggle { display: inline-flex; }
      .hero-grid, .split, .feature-wrap, .case-grid, .story-grid, .cta-box, .foot-grid { grid-template-columns: 1fr; }
      .scene-rail, .adv-grid, .model-grid, .pack-grid, .rank-bar, .stats { grid-template-columns: repeat(2, 1fr); }
      .review-wall, .voice-row { grid-template-columns: repeat(2, 1fr); }
      .news-item { grid-template-columns: 160px 1fr; }
      .hero { min-height: auto; }
      .hero-grid { min-height: auto; padding-top: 36px; }
      .split img, .demo-item img, .story-main img { height: 320px; }
    }
    @media (max-width: 768px) {
      body { font-size: 16px; }
      .topbar { display: none; }
      .section { padding: 56px 0; }
      .hero-actions { flex-direction: column; }
      .hero-actions .btn { width: 100%; }
      .scene-rail, .adv-grid, .model-grid, .pack-grid, .rank-bar, .stats, .review-wall, .voice-row { grid-template-columns: 1fr; }
      .news-item { grid-template-columns: 1fr; }
      .news-body { padding: 0 14px 14px; }
      .feature-tabs { flex-direction: row; overflow-x: auto; }
      .feature-tabs button { flex: 0 0 auto; }
      .hero-nav-btn { top: auto; bottom: 52px; }
    }
    @media (max-width: 375px) {
      .container { width: calc(100% - 28px); }
      h1 { font-size: 26px; }
      .btn { width: 100%; }
      .stat b { font-size: 28px; }
    }