/* roulang page: index */
:root {
      --steel: #3A4549;
      --teal: #2F7A78;
      --teal-deep: #246663;
      --orange: #E07A3D;
      --orange-deep: #c8642c;
      --cream: #F4F1EA;
      --mist: #E8E4DB;
      --char: #1C2124;
      --card: #fffaf3;
      --text: #1C2124;
      --muted: #5C6568;
      --inverse: #F4F1EA;
      --line: rgba(58, 69, 73, .16);
      --line-strong: rgba(58, 69, 73, .28);
      --radius: 8px;
      --radius-sm: 6px;
      --radius-lg: 10px;
      --shadow: 0 8px 24px rgba(28, 33, 36, .08);
      --shadow-hover: 0 12px 28px rgba(28, 33, 36, .12);
      --header-top: 42px;
      --header-main: 68px;
      --space: 20px;
      --max: 1180px;
      --font: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: var(--font);
      font-size: 17px;
      line-height: 1.8;
      color: var(--text);
      background: var(--cream);
      -webkit-font-smoothing: antialiased;
      padding-bottom: 72px;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { color: var(--teal); text-decoration: none; transition: color .2s ease, opacity .2s ease; }
    a:hover { color: var(--orange); }
    a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
      outline: 2px solid var(--orange);
      outline-offset: 3px;
    }
    button, input, select, textarea { font-family: inherit; font-size: inherit; }
    button { cursor: pointer; }
    h1, h2, h3, h4 { margin: 0 0 .55em; line-height: 1.28; color: var(--text); font-weight: 700; }
    h1 { font-size: clamp(32px, 5vw, 46px); }
    h2 { font-size: clamp(26px, 3.4vw, 32px); }
    h3 { font-size: clamp(20px, 2.4vw, 24px); }
    p { margin: 0 0 .85em; color: var(--muted); }
    ul { margin: 0; padding: 0; list-style: none; }
    .container { width: min(100% - 32px, var(--max)); margin: 0 auto; }
    ::selection { background: var(--teal); color: #fff; }

    .site-header { position: sticky; top: 0; z-index: 80; }
    .topbar {
      background: var(--char);
      color: var(--inverse);
      min-height: var(--header-top);
      display: flex;
      align-items: center;
      font-size: 13px;
      letter-spacing: .02em;
    }
    .topbar-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      width: min(100% - 32px, var(--max));
      margin: 0 auto;
      flex-wrap: wrap;
      padding: 6px 0;
    }
    .topbar a { color: var(--inverse); }
    .topbar a:hover { color: #f3c09a; }
    .topbar-links { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
    .topbar-actions { display: flex; gap: 8px; }
    .top-link {
      display: inline-flex; align-items: center; gap: 6px; min-height: 32px;
      padding: 0 10px; border: 1px solid rgba(244,241,234,.22); border-radius: 6px;
    }
    .mainbar {
      background: rgba(244, 241, 234, .92);
      border-bottom: 1px solid var(--line);
      backdrop-filter: none;
      transition: background .2s ease, box-shadow .2s ease;
    }
    .site-header.is-solid .mainbar {
      background: #f7f4ee;
      box-shadow: 0 8px 20px rgba(28, 33, 36, .08);
    }
    .mainbar-inner {
      width: min(100% - 32px, var(--max));
      margin: 0 auto;
      min-height: var(--header-main);
      display: flex;
      align-items: center;
      gap: 18px;
    }
    .logo {
      display: flex; align-items: center; gap: 10px; color: var(--char); flex-shrink: 0;
    }
    .logo:hover { color: var(--steel); }
    .logo-mark {
      width: 42px; height: 42px; border-radius: 8px; background: var(--steel); position: relative;
      box-shadow: inset 0 0 0 2px #6d7a7e;
    }
    .logo-mark::before {
      content: ""; position: absolute; inset: 8px; border-radius: 50%;
      border: 2px solid #d7ddd8; box-shadow: inset 0 0 0 4px #2f7a78;
    }
    .logo-mark::after {
      content: ""; position: absolute; left: 50%; top: 11px; width: 2px; height: 12px;
      background: var(--orange); transform-origin: bottom center; transform: translateX(-50%) rotate(28deg);
      border-radius: 2px;
    }
    .logo-text { display: flex; flex-direction: column; line-height: 1.15; }
    .logo-text strong { font-size: 16px; letter-spacing: .04em; }
    .logo-text span { font-size: 11px; color: var(--muted); font-weight: 500; }
    .nav-toggle {
      margin-left: auto; width: 44px; height: 44px; border: 1px solid var(--line-strong);
      background: var(--card); border-radius: 8px; display: inline-flex; align-items: center; justify-content: center; gap: 5px; flex-direction: column;
    }
    .nav-toggle span { display: block; width: 18px; height: 2px; background: var(--steel); }
    .nav-panel {
      display: none; position: fixed; inset: 0; z-index: 90;
    }
    .nav-panel.is-open { display: block; }
    .nav-mask { position: absolute; inset: 0; background: rgba(28, 33, 36, .46); }
    .nav-drawer {
      position: absolute; right: 0; top: 0; height: 100%; width: min(86vw, 360px);
      background: var(--cream); padding: 22px 18px 32px; overflow: auto;
      box-shadow: -12px 0 32px rgba(28, 33, 36, .16);
    }
    .nav-close {
      width: 44px; height: 44px; border: 1px solid var(--line); background: #fff; border-radius: 8px; float: right;
    }
    .menu { display: flex; flex-direction: column; gap: 6px; margin: 58px 0 18px; }
    .menu a {
      color: var(--text); min-height: 44px; display: flex; align-items: center;
      padding: 0 10px; border-radius: 6px; font-weight: 600;
    }
    .menu a:hover, .menu a.is-active { color: var(--orange); background: rgba(224, 122, 61, .08); }
    .menu a.is-active { box-shadow: inset 0 -2px 0 var(--orange); }
    .header-cta { display: none; }
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      min-height: 44px; padding: 0 18px; border-radius: 8px; border: 1px solid transparent;
      font-weight: 700; letter-spacing: .02em; transition: transform .15s ease, background .2s ease, box-shadow .2s ease, border-color .2s ease, color .2s ease;
    }
    .btn:active { transform: scale(.98); }
    .btn-primary { background: var(--orange); color: #fff; box-shadow: 0 8px 18px rgba(224, 122, 61, .28); }
    .btn-primary:hover { background: var(--orange-deep); color: #fff; }
    .btn-ghost { background: transparent; color: var(--teal); border-color: var(--teal); }
    .btn-ghost:hover { background: rgba(47, 122, 120, .08); color: var(--teal-deep); }
    .btn-dark { background: transparent; color: var(--inverse); border-color: rgba(244, 241, 234, .45); }
    .btn-dark:hover { background: rgba(244, 241, 234, .08); color: #fff; }
    .btn-block { width: 100%; }

    .hero {
      position: relative; min-height: 560px; color: var(--inverse); overflow: hidden;
      scroll-margin-top: 120px;
    }
    .hero-track { position: relative; min-height: 560px; }
    .hero-slide {
      position: absolute; inset: 0; opacity: 0; pointer-events: none;
      transition: opacity .6s ease;
    }
    .hero-slide.is-active { opacity: 1; pointer-events: auto; position: relative; }
    .hero-slide img {
      width: 100%; height: 560px; object-fit: cover; filter: saturate(.92) contrast(1.05);
    }
    .hero-slide::after {
      content: ""; position: absolute; inset: 0;
      background: linear-gradient(90deg, rgba(28, 33, 36, .82) 0%, rgba(28, 33, 36, .52) 46%, rgba(28, 33, 36, .18) 100%);
    }
    .hero-copy {
      position: absolute; inset: 0; z-index: 2; display: flex; align-items: center;
    }
    .hero-grid {
      width: min(100% - 32px, var(--max)); margin: 0 auto;
      display: grid; gap: 22px;
    }
    .kicker {
      display: inline-flex; align-items: center; gap: 8px; color: #f3c09a;
      font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: none; margin-bottom: 10px;
    }
    .kicker::before { content: ""; width: 18px; height: 2px; background: var(--orange); }
    .hero h1, .hero .slide-title { color: #fff; max-width: 18em; margin-bottom: 12px; }
    .hero .lead { color: #e6e2d8; max-width: 42em; font-size: 16px; line-height: 1.85; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 16px; }
    .param-bar, .badge-row { display: flex; flex-wrap: wrap; gap: 8px; }
    .badge {
      display: inline-flex; align-items: center; min-height: 32px; padding: 0 10px;
      border-radius: 6px; font-size: 12px; font-weight: 700; letter-spacing: .04em;
      background: rgba(244, 241, 234, .12); color: #f4f1ea; border: 1px solid rgba(244, 241, 234, .2);
    }
    .badge-pressure { border-color: rgba(47, 122, 120, .7); color: #bfe3e0; }
    .badge-flow { border-color: rgba(224, 122, 61, .7); color: #f3c09a; }
    .badge-vsd { background: rgba(47, 122, 120, .18); }
    .badge-quiet { background: rgba(58, 69, 73, .35); }
    .demo-panel {
      background: rgba(28, 33, 36, .62); border: 1px solid rgba(244, 241, 234, .16);
      border-radius: 10px; padding: 16px; max-width: 360px;
    }
    .demo-panel h3 { color: #fff; font-size: 16px; margin-bottom: 10px; }
    .gauges { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
    .gauge {
      aspect-ratio: 1; border-radius: 50%; border: 8px solid #4b575b;
      background: conic-gradient(#2F7A78 0 72%, #3A4549 0);
      display: grid; place-items: center; position: relative;
    }
    .gauge span, .gauge strong {
      position: relative; z-index: 1; text-align: center; display: block;
    }
    .gauge .inner {
      width: 72%; height: 72%; background: #1c2124; border-radius: 50%;
      display: flex; flex-direction: column; align-items: center; justify-content: center;
    }
    .gauge strong { color: #fff; font-size: 18px; line-height: 1.1; }
    .gauge em { color: #b9c0c2; font-size: 11px; font-style: normal; }
    .hero-ctrl {
      position: absolute; z-index: 3; bottom: 18px; left: 50%; transform: translateX(-50%);
      display: flex; align-items: center; gap: 10px;
    }
    .hero-arrow {
      width: 44px; height: 44px; border-radius: 8px; border: 1px solid rgba(244,241,234,.3);
      background: rgba(28,33,36,.45); color: #fff; font-size: 18px;
    }
    .hero-arrow:hover { background: rgba(224, 122, 61, .85); }
    .dots { display: flex; gap: 8px; }
    .dots button {
      width: 10px; height: 10px; border-radius: 50%; border: 0; background: rgba(244,241,234,.4); padding: 0;
    }
    .dots button.is-active { background: var(--orange); transform: scale(1.2); }
    .pipe {
      position: absolute; right: 8%; top: 18%; width: 140px; height: 90px; pointer-events: none; z-index: 2; opacity: .5;
    }
    .pipe span { position: absolute; background: #9aa6a3; height: 3px; }
    .pipe span:nth-child(1) { width: 80px; top: 12px; left: 0; }
    .pipe span:nth-child(2) { width: 3px; height: 48px; top: 12px; left: 77px; }
    .pipe span:nth-child(3) { width: 54px; top: 57px; left: 77px; }

    main section { scroll-margin-top: 122px; padding: 64px 0; position: relative; }
    .section-head { max-width: 760px; margin-bottom: 28px; }
    .section-head p { font-size: 16px; line-height: 1.85; }
    .sec-mist { background: var(--mist); }
    .sec-cream { background: var(--cream); }
    .sec-card { background: #f7f3ea; }
    .sec-dark { background: var(--char); color: var(--inverse); }
    .sec-dark h2, .sec-dark h3 { color: #fff; }
    .sec-dark p { color: #c9cecf; }
    .sec-teal { background: #2a4f4e; color: var(--inverse); }
    .sec-teal h2, .sec-teal h3, .sec-teal p { color: #eef4f3; }
    .sec-rule { border-top: 1px solid var(--line); }

    .intro-grid { display: grid; gap: 28px; }
    .catalog {
      display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 18px;
    }
    .catalog li {
      min-height: 36px; padding: 6px 12px; border-radius: 6px; background: #fff; border: 1px solid var(--line);
      font-size: 13px; font-weight: 700; color: var(--steel);
    }
    .spec-inline { display: grid; gap: 8px; margin: 16px 0 0; }
    .spec-inline li {
      display: grid; grid-template-columns: 92px 1fr; gap: 8px; font-size: 14px;
      padding: 8px 0; border-bottom: 1px dashed var(--line);
    }
    .spec-inline b { color: var(--teal); }
    .value-triple { display: grid; gap: 10px; margin-top: 18px; }
    .value-triple article {
      background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px;
      box-shadow: var(--shadow);
    }
    .value-triple strong { display: block; color: var(--steel); }
    .value-triple span { color: var(--muted); font-size: 14px; }
    .frame-img {
      border-radius: 10px; overflow: hidden; box-shadow: var(--shadow); position: relative;
      border: 1px solid var(--line);
    }
    .frame-img img { width: 100%; height: 100%; object-fit: cover; min-height: 280px; }
    .bolt { position: absolute; width: 8px; height: 8px; background: #c5bba8; border-radius: 50%; box-shadow: inset 0 0 0 2px #7b7466; }
    .bolt-tl { top: 10px; left: 10px; } .bolt-tr { top: 10px; right: 10px; }
    .bolt-bl { bottom: 10px; left: 10px; } .bolt-br { bottom: 10px; right: 10px; }

    .fn-layout { display: grid; gap: 16px; }
    .fn-index { display: flex; gap: 8px; overflow: auto; padding-bottom: 6px; }
    .fn-index button {
      flex: 0 0 auto; min-height: 44px; padding: 8px 14px; border-radius: 8px;
      border: 1px solid var(--line-strong); background: var(--card); color: var(--steel); font-weight: 700;
    }
    .fn-index button.is-active, .fn-index button:hover {
      background: var(--steel); color: #fff; border-color: var(--steel);
    }
    .fn-panel {
      display: none; background: var(--card); border-radius: 10px; overflow: hidden;
      border: 1px solid var(--line); box-shadow: var(--shadow); min-height: 320px;
    }
    .fn-panel.is-active { display: grid; }
    .fn-panel img { width: 100%; height: 220px; object-fit: cover; }
    .fn-body { padding: 18px; }
    .spec-list { display: grid; gap: 8px; margin-top: 8px; }
    .spec-list li {
      display: flex; justify-content: space-between; gap: 12px; font-size: 14px;
      padding: 8px 0; border-bottom: 1px solid var(--line); color: var(--text);
    }
    .spec-list span { color: var(--muted); }

    .cap-grid { display: grid; gap: 14px; }
    .cap-card {
      background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 16px;
      box-shadow: var(--shadow); transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
    }
    .cap-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: var(--teal); }
    .cap-icon {
      width: 44px; height: 44px; border-radius: 8px; background: var(--steel); color: #fff;
      display: grid; place-items: center; font-weight: 800; margin-bottom: 10px;
    }
    .meter {
      height: 6px; background: #e2ddd1; border-radius: 99px; overflow: hidden; margin: 10px 0;
    }
    .meter span { display: block; height: 100%; background: linear-gradient(90deg, var(--teal), #4aa09c); }
    .cap-card .metric { font-size: 22px; color: var(--steel); font-weight: 800; line-height: 1.2; }
    .cap-card p { font-size: 15px; margin: 0; }

    .scene-band { display: grid; gap: 14px; }
    .scene {
      position: relative; min-height: 220px; border-radius: 10px; overflow: hidden; color: #fff;
      box-shadow: var(--shadow);
    }
    .scene img { width: 100%; height: 100%; object-fit: cover; min-height: 220px; }
    .scene figcaption {
      position: absolute; inset: auto 0 0; padding: 18px 16px 16px;
      background: linear-gradient(180deg, transparent, rgba(28,33,36,.86));
    }
    .scene h3 { color: #fff; margin-bottom: 4px; }
    .scene p { color: #d7d4cc; margin: 0; font-size: 15px; }
    .scene.wide { min-height: 280px; }

    .product-stage { display: grid; gap: 14px; }
    .product {
      background: var(--card); border: 1px solid var(--line); border-radius: 10px; overflow: hidden;
      box-shadow: var(--shadow); display: grid; transition: transform .2s ease, border-color .2s ease;
    }
    .product:hover { transform: translateY(-4px); border-color: var(--orange); }
    .product img { width: 100%; height: 210px; object-fit: cover; }
    .product-body { padding: 16px; display: grid; gap: 8px; }
    .product table { width: 100%; border-collapse: collapse; font-size: 14px; }
    .product td { padding: 6px 0; border-bottom: 1px solid var(--line); color: var(--text); }
    .product td:last-child { text-align: right; color: var(--muted); }

    .demo-wrap { display: grid; gap: 16px; }
    .demo-stage {
      position: relative; border-radius: 10px; overflow: hidden; min-height: 340px;
      border: 1px solid var(--line); box-shadow: var(--shadow);
    }
    .demo-stage img { width: 100%; height: 420px; object-fit: cover; }
    .hotspot {
      position: absolute; width: 44px; height: 44px; border-radius: 50%;
      border: 2px solid #fff; background: rgba(224, 122, 61, .9); color: #fff; font-weight: 800;
    }
    .hotspot:hover, .hotspot.is-active { background: var(--teal); }
    .demo-note {
      background: var(--card); border-radius: 10px; padding: 16px 18px; border: 1px solid var(--line);
    }
    .demo-note strong { display: block; margin-bottom: 6px; }

    .case-grid { display: grid; gap: 18px; }
    .idea { font-size: 22px; line-height: 1.5; color: #fff; max-width: 18em; }
    .result {
      background: #262c2f; border: 1px solid rgba(244,241,234,.08); border-radius: 10px; padding: 16px 18px;
    }
    .result b { color: #f3c09a; font-size: 28px; display: block; line-height: 1.2; }
    .result span { color: #d0d4d5; font-size: 14px; }

    .story-main, .story-side { display: grid; gap: 16px; }
    .story-card {
      background: var(--card); border-radius: 10px; overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow);
    }
    .story-card img { width: 100%; height: 220px; object-fit: cover; }
    .story-card div { padding: 16px 18px 18px; }
    .story-side { margin-top: 14px; }

    .stats {
      background: var(--steel); color: #fff; padding: 36px 0;
    }
    .stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
    .stat strong { display: block; font-size: 32px; line-height: 1.1; color: #fff; }
    .stat span { color: #d5dbdc; font-size: 13px; }

    .plan-grid { display: grid; gap: 14px; }
    .plan {
      background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 20px 18px;
      box-shadow: var(--shadow); display: grid; gap: 8px;
    }
    .plan.featured { border: 2px solid var(--orange); transform: translateY(-4px); }
    .plan .price { font-size: 30px; color: var(--steel); font-weight: 800; }
    .plan .price em { font-size: 14px; font-style: normal; color: var(--muted); font-weight: 600; }
    .plan ul { display: grid; gap: 6px; margin: 8px 0 12px; }
    .plan li { padding-left: 16px; position: relative; color: var(--text); font-size: 15px; }
    .plan li::before { content: ""; width: 7px; height: 7px; background: var(--teal); border-radius: 50%; position: absolute; left: 0; top: 9px; }

    .review-wall { columns: 1; column-gap: 14px; }
    .review {
      break-inside: avoid; margin-bottom: 14px; background: var(--card);
      border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px;
    }
    .stars { color: var(--orange); letter-spacing: 2px; font-size: 13px; }
    .review h3 { font-size: 16px; margin: 6px 0 4px; }
    .review p { font-size: 15px; margin: 0; }
    .review .meta { font-size: 12px; color: var(--muted); margin-top: 8px; }

    .voice {
      max-width: 820px; margin: 0 auto; text-align: left; position: relative; padding: 12px 0 0 8px;
    }
    .voice::before { content: "“"; font-size: 88px; color: var(--teal); position: absolute; left: -6px; top: -28px; line-height: 1; opacity: .35; }
    .voice blockquote { margin: 0; font-size: 22px; line-height: 1.7; color: var(--text); font-weight: 600; }
    .voice .who { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 8px; }
    .chip { min-height: 32px; padding: 4px 10px; border-radius: 6px; background: #fff; border: 1px solid var(--line); font-size: 13px; color: var(--steel); }

    .news-list { display: grid; gap: 12px; }
    .news {
      display: grid; gap: 12px; background: var(--card); border: 1px solid var(--line);
      border-radius: 10px; overflow: hidden; box-shadow: var(--shadow);
    }
    .news img { width: 100%; height: 160px; object-fit: cover; }
    .news div { padding: 4px 16px 16px; }
    .news time { color: var(--teal); font-size: 13px; font-weight: 700; }
    .more-link { display: inline-flex; min-height: 44px; align-items: center; font-weight: 700; }

    .faq-item { border-bottom: 1px solid var(--line); }
    .faq-item button {
      width: 100%; text-align: left; background: none; border: 0; min-height: 56px;
      padding: 12px 36px 12px 0; font-weight: 700; color: var(--text); position: relative;
    }
    .faq-item button::after {
      content: "+"; position: absolute; right: 0; top: 50%; transform: translateY(-50%);
      width: 28px; height: 28px; border: 1px solid var(--line-strong); border-radius: 6px; display: grid; place-items: center; color: var(--teal);
    }
    .faq-item.is-open button::after { content: "–"; background: var(--orange); color: #fff; border-color: var(--orange); }
    .faq-item .ans { display: none; padding: 0 0 16px; color: var(--muted); }
    .faq-item.is-open .ans { display: block; }

    .cta-box {
      display: grid; gap: 22px; background: var(--card); border: 1px solid var(--line);
      border-radius: 10px; padding: 20px; box-shadow: var(--shadow); position: relative;
    }
    .cta-box::before {
      content: ""; position: absolute; left: 0; top: 18px; bottom: 18px; width: 4px; background: var(--orange); border-radius: 4px;
    }
    form { display: grid; gap: 12px; }
    label { display: grid; gap: 6px; font-size: 14px; font-weight: 700; color: var(--steel); }
    input, select, textarea {
      width: 100%; min-height: 48px; border: 1px solid var(--line-strong); border-radius: 8px;
      background: #fff; padding: 0 12px; color: var(--text);
    }
    textarea { min-height: 96px; padding: 12px; resize: vertical; }
    input.is-err, select.is-err, textarea.is-err { border-color: var(--orange); background: #fff6ef; }
    .err { color: var(--orange-deep); font-size: 12px; font-weight: 600; display: none; }
    .field.is-err .err { display: block; }
    .form-ok {
      display: none; background: #e7f3f2; border: 1px solid var(--teal); color: var(--teal-deep);
      border-radius: 8px; padding: 12px 14px; font-weight: 700;
    }
    .form-ok.is-show { display: block; }
    .contact-side {
      background: var(--steel); color: #fff; border-radius: 10px; padding: 20px;
    }
    .contact-side h3 { color: #fff; }
    .contact-side a { color: #f3c09a; }
    .contact-side p { color: #d5dbdc; }
    .contact-side dl { display: grid; gap: 10px; }
    .contact-side dt { font-size: 12px; color: #b9c0c2; }
    .contact-side dd { margin: 0; font-weight: 700; }

    .site-footer { background: #161a1c; color: #c9cecf; padding: 48px 0 28px; }
    .foot-grid { display: grid; gap: 24px; }
    .site-footer h3 { color: #fff; font-size: 16px; }
    .site-footer a { color: #d7d4cc; }
    .site-footer a:hover { color: var(--orange); }
    .foot-links { display: grid; gap: 8px; }
    .copyright { margin-top: 28px; padding-top: 16px; border-top: 1px solid rgba(244,241,234,.08); font-size: 13px; }

    .fixbar {
      position: fixed; left: 0; right: 0; bottom: 0; z-index: 70;
      background: #1c2124; color: #fff; display: flex; gap: 8px; justify-content: space-between; align-items: center;
      padding: 8px 12px calc(8px + env(safe-area-inset-bottom));
      box-shadow: 0 -8px 24px rgba(28,33,36,.18);
    }
    .fixbar p { color: #d5dbdc; margin: 0; font-size: 13px; }
    .fixbar .btn { min-height: 44px; }

    @media (min-width: 768px) {
      body { font-size: 17px; padding-bottom: 0; }
      .hero, .hero-track, .hero-slide img { min-height: 620px; height: auto; }
      .hero-slide img { height: 620px; }
      .hero-grid { grid-template-columns: 1.15fr .85fr; align-items: center; }
      .intro-grid { grid-template-columns: 1.2fr 1fr; align-items: center; }
      .value-triple { grid-template-columns: repeat(3, 1fr); }
      .cap-grid { grid-template-columns: repeat(2, 1fr); }
      .scene-band { grid-template-columns: 1.3fr 1fr; }
      .product-stage { grid-template-columns: 1.2fr .8fr; }
      .product.small img { height: 150px; }
      .stack { display: grid; gap: 14px; }
      .demo-wrap { grid-template-columns: 1.4fr .8fr; align-items: stretch; }
      .case-grid { grid-template-columns: 1fr 1fr; }
      .story-main { grid-template-columns: 1.1fr .9fr; align-items: center; }
      .story-side { grid-template-columns: 1fr 1fr; }
      .stats-grid { grid-template-columns: repeat(3, 1fr); }
      .plan-grid { grid-template-columns: repeat(3, 1fr); align-items: stretch; }
      .review-wall { columns: 2; }
      .news-list { grid-template-columns: 1fr 1fr; }
      .cta-box { grid-template-columns: 1.2fr .8fr; padding: 28px; }
      .foot-grid { grid-template-columns: 1.4fr 1fr 1fr 1.1fr; }
      .fn-panel.is-active { grid-template-columns: 1fr 1.1fr; }
      .fn-panel img { height: 100%; min-height: 320px; }
      .fixbar { display: none; }
    }
    @media (min-width: 1024px) {
      .nav-toggle, .nav-panel { display: none !important; }
      .menu { flex-direction: row; margin: 0; gap: 2px; flex: 1; justify-content: center; }
      .menu a { padding: 0 9px; font-size: 14px; min-height: 44px; }
      .header-cta { display: inline-flex; margin-left: auto; }
      .cap-grid { grid-template-columns: repeat(3, 1fr); }
      .scene-band { grid-template-columns: 1.4fr 1fr 1fr; }
      .scene.wide { grid-row: span 2; min-height: 100%; }
      .product-stage { grid-template-columns: 1.25fr .75fr; }
      .stats-grid { grid-template-columns: repeat(6, 1fr); }
      .review-wall { columns: 3; }
      .news-list { grid-template-columns: repeat(3, 1fr); }
      .fn-layout { grid-template-columns: 220px 1fr; }
      .fn-index { flex-direction: column; overflow: visible; }
      .case-grid { grid-template-columns: .9fr 1.1fr; }
      .results { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
    }
    @media (min-width: 1440px) {
      :root { --max: 1280px; }
      .hero, .hero-track, .hero-slide img { min-height: 680px; }
      .hero-slide img { height: 680px; }
    }
    @media (max-width: 374px) {
      .container, .topbar-inner, .mainbar-inner, .hero-grid { width: min(100% - 20px, var(--max)); }
      h1 { font-size: 30px; }
    }

/* roulang page: index */
:root {
      --steel: #3A4549;
      --steel-deep: #2c3538;
      --air: #2F7A78;
      --air-deep: #246462;
      --air-soft: #d7e8e6;
      --warn: #E07A3D;
      --warn-deep: #c9662c;
      --warn-soft: #f6e3d4;
      --bg: #F4F1EA;
      --mist: #E8E4DB;
      --char: #1C2124;
      --card: #fffaf3;
      --text: #1C2124;
      --muted: #5C6568;
      --invert: #F4F1EA;
      --line: rgba(58, 69, 73, .16);
      --line-strong: rgba(58, 69, 73, .28);
      --radius: 8px;
      --radius-sm: 6px;
      --radius-lg: 10px;
      --shadow: 0 8px 24px rgba(28, 33, 36, .08);
      --shadow-hover: 0 12px 28px rgba(28, 33, 36, .12);
      --space: 24px;
      --container: 1180px;
      --topbar: 40px;
      --nav: 74px;
      --header: 114px;
      --font: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    html, body { margin: 0; padding: 0; overflow-x: hidden; }
    body {
      font-family: var(--font);
      color: var(--text);
      background: var(--bg);
      font-size: 17px;
      line-height: 1.8;
      padding-bottom: 72px;
    }
    img { max-width: 100%; height: auto; display: block; border: 0; }
    a { color: var(--air); text-decoration: none; transition: color .2s ease, opacity .2s ease; }
    a:hover { color: var(--warn); }
    a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
      outline: 2px solid var(--warn);
      outline-offset: 2px;
    }
    button, input, select, textarea { font-family: inherit; }
    button { cursor: pointer; }
    h1, h2, h3, h4, p { margin: 0; }
    ul, ol { margin: 0; padding: 0; list-style: none; }
    .container { width: min(100% - 40px, var(--container)); margin: 0 auto; }
    .skip {
      position: absolute; left: -999px; top: 0;
    }
    .skip:focus { left: 16px; top: 16px; z-index: 80; background: #fff; padding: 8px 12px; }

    .topbar {
      height: var(--topbar);
      background: var(--char);
      color: var(--invert);
      font-size: 13px;
      line-height: var(--topbar);
    }
    .topbar-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      height: var(--topbar);
    }
    .topbar a { color: var(--invert); }
    .topbar a:hover { color: #f0c09a; }
    .topbar-left, .topbar-right { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
    .topbar-item { display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
    .topbar-dot { width: 4px; height: 4px; border-radius: 50%; background: var(--air); display: inline-block; }
    .topbar-link {
      min-height: 28px;
      padding: 0 10px;
      border: 1px solid rgba(244, 241, 234, .28);
      border-radius: 6px;
      line-height: 26px;
    }
    .topbar-link:hover { border-color: var(--warn); color: #f0c09a; }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--bg);
    }
    .nav {
      height: var(--nav);
      background: #f7f4ed;
      border-bottom: 1px solid var(--line);
      transition: background .2s ease, box-shadow .2s ease;
    }
    .site-header.is-solid .nav {
      background: #f3efe6;
      box-shadow: 0 8px 18px rgba(28, 33, 36, .08);
    }
    .nav-inner {
      height: var(--nav);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--char);
      min-height: 44px;
      flex-shrink: 0;
    }
    .logo:hover { color: var(--steel); }
    .logo-mark {
      width: 42px; height: 42px; flex-shrink: 0;
    }
    .logo-text { display: flex; flex-direction: column; line-height: 1.15; }
    .logo-text strong { font-size: 18px; font-weight: 700; letter-spacing: .04em; }
    .logo-text span { font-size: 11px; color: var(--muted); letter-spacing: .18em; }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 4px;
      flex: 1;
      justify-content: center;
    }
    .nav-links a {
      color: var(--steel);
      font-size: 14px;
      font-weight: 500;
      padding: 8px 10px;
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      position: relative;
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      left: 10px; right: 10px; bottom: 6px;
      height: 2px;
      background: var(--warn);
      transform: scaleX(0);
      transform-origin: left;
      transition: transform .2s ease;
    }
    .nav-links a:hover, .nav-links a.is-active { color: var(--char); }
    .nav-links a.is-active::after, .nav-links a:hover::after { transform: scaleX(1); }
    .nav-cta {
      flex-shrink: 0;
    }
    .menu-toggle {
      display: none;
      width: 44px; height: 44px;
      border: 1px solid var(--line-strong);
      background: var(--card);
      border-radius: 8px;
      align-items: center;
      justify-content: center;
      flex-direction: column;
      gap: 5px;
    }
    .menu-toggle span {
      width: 18px; height: 2px; background: var(--char); display: block;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 0 20px;
      border-radius: 8px;
      font-size: 15px;
      font-weight: 600;
      border: 1px solid transparent;
      transition: transform .15s ease, box-shadow .2s ease, background .2s ease, color .2s ease, border-color .2s ease;
      text-align: center;
    }
    .btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
    .btn:active { transform: scale(.98); }
    .btn-primary { background: var(--warn); color: #fff; }
    .btn-primary:hover { background: var(--warn-deep); color: #fff; }
    .btn-ghost { background: transparent; color: var(--invert); border-color: rgba(244,241,234,.55); }
    .btn-ghost:hover { background: rgba(244,241,234,.08); color: #fff; }
    .btn-line { background: transparent; color: var(--air); border-color: var(--air); }
    .btn-line:hover { background: var(--air); color: #fff; }
    .btn-dark { background: var(--steel); color: #fff; }
    .btn-dark:hover { background: var(--steel-deep); color: #fff; }
    .btn-sm { min-height: 44px; padding: 0 14px; font-size: 14px; }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      min-height: 28px;
      padding: 0 10px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 600;
      letter-spacing: .04em;
      background: var(--air-soft);
      color: var(--air-deep);
    }
    .badge-warn { background: var(--warn-soft); color: #8a4314; }
    .badge-steel { background: rgba(58,69,73,.12); color: var(--steel); }
    .badge-light { background: rgba(244,241,234,.16); color: var(--invert); border: 1px solid rgba(244,241,234,.2); }

    main { display: block; }
    section { position: relative; }
    .section {
      padding: 88px 0;
    }
    .section-mist { background: var(--mist); }
    .section-card { background: var(--bg); }
    .section-dark { background: var(--char); color: var(--invert); }
    .section-steel { background: var(--steel); color: var(--invert); }
    .kicker {
      font-size: 13px;
      font-weight: 600;
      letter-spacing: .16em;
      color: var(--air);
      margin-bottom: 10px;
    }
    .section-dark .kicker, .section-steel .kicker { color: #9fd0cd; }
    .h2 {
      font-size: 32px;
      line-height: 1.28;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: .02em;
    }
    .lead {
      font-size: 16px;
      line-height: 1.85;
      color: var(--muted);
      max-width: 760px;
      margin-bottom: 32px;
    }
    .section-dark .lead, .section-steel .lead { color: rgba(244,241,234,.78); }
    .h3 { font-size: 22px; line-height: 1.35; font-weight: 700; margin-bottom: 10px; }

    #overview { padding: 0; background: var(--char); }
    .hero {
      position: relative;
      min-height: calc(100vh - var(--header));
      min-height: 680px;
    }
    .hero-track { position: relative; overflow: hidden; }
    .hero-slide {
      display: none;
      min-height: 680px;
      position: relative;
      isolation: isolate;
    }
    .hero-slide.is-on { display: block; }
    .hero-bg {
      position: absolute; inset: 0;
      background-size: cover;
      background-position: center;
      z-index: 0;
    }
    .hero-bg::after {
      content: "";
      position: absolute; inset: 0;
      background:
        linear-gradient(90deg, rgba(28,33,36,.88) 0%, rgba(28,33,36,.62) 48%, rgba(28,33,36,.28) 100%),
        linear-gradient(180deg, rgba(28,33,36,.2) 0%, rgba(28,33,36,.35) 100%);
    }
    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr);
      gap: 36px;
      align-items: center;
      min-height: 680px;
      padding: 48px 0 92px;
    }
    .brand-chip {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: #f0c09a;
      font-size: 13px;
      font-weight: 600;
      letter-spacing: .12em;
      margin-bottom: 14px;
    }
    .hero h1, .hero-title {
      font-size: 42px;
      line-height: 1.22;
      font-weight: 700;
      color: #fff;
      margin-bottom: 16px;
      max-width: 16em;
    }
    .hero-copy p.intro {
      color: rgba(244,241,234,.86);
      font-size: 16px;
      line-height: 1.85;
      max-width: 38em;
      margin-bottom: 24px;
    }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 22px; }
    .param-bar {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 10px;
      padding-top: 8px;
    }
    .param-item {
      border: 1px solid rgba(244,241,234,.16);
      background: rgba(28,33,36,.35);
      border-radius: 8px;
      padding: 10px 12px;
    }
    .param-item b { display: block; color: #fff; font-size: 18px; line-height: 1.3; }
    .param-item span { color: rgba(244,241,234,.7); font-size: 12px; }
    .hero-stage {
      background: rgba(244,241,234,.08);
      border: 1px solid rgba(244,241,234,.16);
      border-radius: 10px;
      overflow: hidden;
      box-shadow: var(--shadow);
      backdrop-filter: none;
    }
    .hero-stage img { width: 100%; height: 250px; object-fit: cover; }
    .stage-body { padding: 16px 18px 18px; }
    .stage-body h3 { color: #fff; font-size: 18px; margin-bottom: 8px; }
    .spec-row { display: flex; justify-content: space-between; gap: 8px; color: rgba(244,241,234,.8); font-size: 13px; padding: 6px 0; border-bottom: 1px dashed rgba(244,241,234,.16); }
    .spec-row:last-child { border-bottom: 0; }
    .hero-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
    .hero-ctrl {
      position: absolute;
      left: 0; right: 0; bottom: 22px;
      z-index: 2;
    }
    .hero-ctrl-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
    }
    .dots { display: flex; gap: 8px; }
    .dot {
      width: 44px; height: 44px;
      border: 0; background: transparent;
      display: grid; place-items: center;
    }
    .dot i {
      width: 10px; height: 10px; border-radius: 50%;
      background: rgba(244,241,234,.35);
      display: block;
    }
    .dot.is-on i, .dot:hover i { background: var(--warn); }
    .arrow-group { display: flex; gap: 8px; }
    .arrow {
      width: 44px; height: 44px;
      border-radius: 8px;
      border: 1px solid rgba(244,241,234,.35);
      background: rgba(28,33,36,.45);
      color: #fff;
      font-size: 18px;
    }
    .arrow:hover { border-color: var(--warn); background: rgba(224,122,61,.2); }
    .pipe {
      position: absolute; pointer-events: none; opacity: .35;
      border: 1px solid rgba(47,122,120,.7);
      border-right: 0; border-bottom: 0;
    }

    .sell-strip {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      background: #2b3336;
      border-top: 1px solid rgba(244,241,234,.08);
    }
    .sell-item {
      padding: 22px 28px;
      border-right: 1px solid rgba(244,241,234,.08);
    }
    .sell-item:last-child { border-right: 0; }
    .sell-item strong { display: block; color: #fff; font-size: 16px; margin-bottom: 6px; }
    .sell-item p { color: rgba(244,241,234,.72); font-size: 14px; line-height: 1.7; }

    .split {
      display: grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 48px;
      align-items: center;
    }
    .check-list { margin-top: 18px; display: grid; gap: 10px; }
    .check-list li {
      display: grid;
      grid-template-columns: 18px 1fr;
      gap: 10px;
      color: var(--text);
      font-size: 15px;
    }
    .check-list i {
      width: 18px; height: 18px; margin-top: 6px;
      border: 2px solid var(--air);
      border-radius: 50%;
      position: relative;
    }
    .check-list i::after {
      content: "";
      position: absolute; left: 4px; top: 1px;
      width: 6px; height: 10px;
      border: 2px solid var(--air);
      border-top: 0; border-left: 0;
      transform: rotate(45deg);
    }
    .spec-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 22px;
      background: var(--card);
      border-radius: 8px;
      overflow: hidden;
      box-shadow: var(--shadow);
    }
    .spec-table th, .spec-table td {
      text-align: left;
      padding: 12px 14px;
      border-bottom: 1px solid var(--line);
      font-size: 14px;
    }
    .spec-table th { background: var(--steel); color: #fff; font-weight: 600; }
    .spec-table tr:last-child td { border-bottom: 0; }
    .media-frame {
      position: relative;
      border-radius: 10px;
      overflow: hidden;
      box-shadow: var(--shadow);
      background: var(--card);
    }
    .media-frame img { width: 100%; height: 460px; object-fit: cover; }
    .media-caption {
      position: absolute; left: 12px; right: 12px; bottom: 12px;
      background: rgba(28,33,36,.78);
      color: #fff;
      padding: 10px 12px;
      border-radius: 6px;
      font-size: 13px;
    }

    .fn-layout {
      display: grid;
      grid-template-columns: 240px 1fr;
      gap: 22px;
      align-items: start;
    }
    .fn-index {
      display: flex;
      flex-direction: column;
      gap: 8px;
      position: sticky;
      top: calc(var(--header) + 16px);
    }
    .fn-btn {
      text-align: left;
      min-height: 48px;
      padding: 10px 14px;
      border-radius: 8px;
      border: 1px solid var(--line);
      background: var(--card);
      color: var(--steel);
      font-size: 14px;
      font-weight: 600;
    }
    .fn-btn.is-on, .fn-btn:hover {
      background: var(--steel);
      color: #fff;
      border-color: var(--steel);
    }
    .fn-panel {
      display: none;
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: 10px;
      overflow: hidden;
      box-shadow: var(--shadow);
    }
    .fn-panel.is-on { display: grid; grid-template-columns: 1.05fr .95fr; }
    .fn-copy { padding: 28px; }
    .fn-copy p { color: var(--muted); margin-bottom: 16px; font-size: 15px; }
    .spec-list { display: grid; gap: 8px; }
    .spec-list li {
      display: flex;
      justify-content: space-between;
      gap: 12px;
      padding: 8px 0;
      border-bottom: 1px solid var(--line);
      font-size: 14px;
    }
    .spec-list span { color: var(--muted); }
    .fn-photo img { width: 100%; height: 100%; min-height: 340px; object-fit: cover; }

    .cap-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }
    .cap-card {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 0;
      overflow: hidden;
      box-shadow: var(--shadow);
      transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
    }
    .cap-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
      border-color: var(--air);
    }
    .cap-metric {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      gap: 8px;
      padding: 14px 16px 0;
    }
    .cap-metric b { font-size: 26px; color: var(--air); line-height: 1.2; }
    .cap-metric span { font-size: 12px; color: var(--muted); }
    .cap-card h3 { font-size: 18px; padding: 8px 16px 0; }
    .cap-card p { font-size: 14px; color: var(--muted); padding: 6px 16px 16px; line-height: 1.75; }
    .cap-bar { height: 6px; background: var(--mist); }
    .cap-bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--air), var(--warn)); width: 70%; }

    .scene-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr;
      grid-template-rows: 250px 250px;
      gap: 14px;
    }
    .scene-card {
      position: relative;
      border-radius: 10px;
      overflow: hidden;
      min-height: 220px;
      color: #fff;
      isolation: isolate;
    }
    .scene-card:first-child { grid-row: 1 / span 2; }
    .scene-card img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; }
    .scene-card::after {
      content: "";
      position: absolute; inset: 0;
      background: linear-gradient(180deg, rgba(28,33,36,.1) 10%, rgba(28,33,36,.82) 100%);
    }
    .scene-body { position: relative; z-index: 1; height: 100%; display: flex; flex-direction: column; justify-content: flex-end; padding: 18px; }
    .scene-body h3 { font-size: 20px; margin-bottom: 6px; }
    .scene-body p { font-size: 14px; color: rgba(244,241,234,.86); line-height: 1.7; }

    .prod-layout {
      display: grid;
      grid-template-columns: 1.25fr .75fr;
      gap: 16px;
    }
    .prod-side { display: grid; gap: 16px; }
    .prod-card {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: 10px;
      overflow: hidden;
      box-shadow: var(--shadow);
      transition: transform .2s ease, border-color .2s ease;
    }
    .prod-card:hover { transform: translateY(-3px); border-color: var(--warn); }
    .prod-main img { width: 100%; height: 280px; object-fit: cover; }
    .prod-side img { width: 100%; height: 150px; object-fit: cover; }
    .prod-body { padding: 18px 20px 20px; }
    .prod-body p { color: var(--muted); font-size: 14px; margin-bottom: 12px; }
    .kv { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px; margin-bottom: 16px; }
    .kv li { font-size: 13px; color: var(--steel); border-bottom: 1px dashed var(--line); padding-bottom: 6px; }
    .kv b { display: block; color: var(--muted); font-weight: 500; font-size: 12px; }

    .demo-wrap {
      display: grid;
      grid-template-columns: 1.3fr .7fr;
      gap: 22px;
    }
    .demo-stage {
      position: relative;
      border-radius: 10px;
      overflow: hidden;
      min-height: 430px;
      background: #2a3134;
    }
    .demo-stage img { width: 100%; height: 430px; object-fit: cover; display: none; }
    .demo-stage img.is-on { display: block; }
    .hotspot {
      position: absolute;
      width: 44px; height: 44px;
      border: 0;
      background: transparent;
      transform: translate(-50%, -50%);
    }
    .hotspot i {
      width: 16px; height: 16px;
      border-radius: 50%;
      background: var(--warn);
      display: block;
      margin: 14px auto;
      box-shadow: 0 0 0 8px rgba(224,122,61,.28);
    }
    .hot-tip {
      position: absolute;
      left: 50%; top: 46px;
      transform: translateX(-50%);
      background: var(--char);
      color: #fff;
      padding: 8px 10px;
      border-radius: 6px;
      width: max-content;
      max-width: 180px;
      font-size: 12px;
      display: none;
    }
    .hotspot:hover .hot-tip, .hotspot:focus .hot-tip { display: block; }
    .demo-tabs { display: grid; gap: 10px; }
    .demo-tab {
      text-align: left;
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 14px 16px;
      min-height: 88px;
    }
    .demo-tab.is-on { border-color: var(--air); box-shadow: var(--shadow); }
    .demo-tab strong { display: block; margin-bottom: 4px; }
    .demo-tab span { color: var(--muted); font-size: 13px; }

    .case-grid {
      display: grid;
      grid-template-columns: .8fr 1.2fr;
      gap: 36px;
      align-items: start;
    }
    .idea {
      font-size: 30px;
      line-height: 1.4;
      font-weight: 700;
      margin: 12px 0 18px;
    }
    .result-list { display: grid; gap: 14px; }
    .result-card {
      background: rgba(244,241,234,.06);
      border: 1px solid rgba(244,241,234,.12);
      border-radius: 8px;
      padding: 18px 20px;
    }
    .result-card h3 { color: #fff; font-size: 18px; }
    .result-card p { color: rgba(244,241,234,.78); font-size: 14px; }
    .delta { display: flex; gap: 18px; margin-top: 10px; flex-wrap: wrap; }
    .delta b { color: #9fd0cd; font-size: 20px; display: block; line-height: 1.2; }
    .delta span { color: rgba(244,241,234,.6); font-size: 12px; }

    .story-main {
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 28px;
      background: var(--card);
      border-radius: 10px;
      overflow: hidden;
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
      margin-bottom: 16px;
    }
    .story-main img { width: 100%; height: 100%; min-height: 320px; object-fit: cover; }
    .story-copy { padding: 28px; }
    .story-copy p { color: var(--muted); margin-bottom: 12px; }
    .side-notes { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .note {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 20px;
    }
    .note h3 { font-size: 18px; }
    .note p { color: var(--muted); font-size: 14px; }

    .stats {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 8px;
    }
    .stat {
      text-align: left;
      padding: 8px 10px;
      border-left: 2px solid var(--warn);
    }
    .stat b { display: block; font-size: 34px; line-height: 1.15; color: #fff; }
    .stat span { color: rgba(244,241,234,.72); font-size: 13px; }

    .plan-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      align-items: stretch;
    }
    .plan {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: 10px;
      padding: 24px 22px 22px;
      box-shadow: var(--shadow);
      display: flex;
      flex-direction: column;
      transition: transform .2s ease, border-color .2s ease;
    }
    .plan:hover { transform: translateY(-4px); border-color: var(--air); }
    .plan.is-hot {
      border-color: var(--warn);
      background: #fff8f1;
    }
    .plan .price { font-size: 30px; font-weight: 700; color: var(--steel); margin: 8px 0 4px; }
    .plan .price small { font-size: 14px; font-weight: 500; color: var(--muted); }
    .plan p { color: var(--muted); font-size: 14px; margin-bottom: 12px; }
    .plan ul { margin: 0 0 18px; display: grid; gap: 8px; flex: 1; }
    .plan li { font-size: 14px; padding-left: 14px; position: relative; }
    .plan li::before { content: ""; width: 6px; height: 6px; background: var(--air); border-radius: 50%; position: absolute; left: 0; top: 9px; }

    .review-wall {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
    }
    .review {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 16px;
      min-height: 180px;
    }
    .review:nth-child(1), .review:nth-child(6) { grid-column: span 2; }
    .stars { color: var(--warn); letter-spacing: 2px; font-size: 13px; margin-bottom: 8px; }
    .review p { font-size: 14px; color: var(--text); margin-bottom: 12px; }
    .who { font-size: 12px; color: var(--muted); }

    .voice {
      max-width: 860px;
      margin: 0 auto;
      text-align: left;
      padding: 12px 0 8px;
    }
    .quote-mark { font-size: 72px; line-height: .6; color: var(--air); font-weight: 700; }
    .voice blockquote {
      margin: 0 0 18px;
      font-size: 24px;
      line-height: 1.6;
      font-weight: 500;
    }
    .voice-meta { display: flex; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: 14px; }
    .voice-extra {
      margin-top: 28px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .voice-extra p {
      background: var(--card);
      border-left: 3px solid var(--air);
      padding: 16px 18px;
      font-size: 15px;
      color: var(--steel);
    }

    .news-list { display: grid; gap: 14px; }
    .news-item {
      display: grid;
      grid-template-columns: 220px 1fr auto;
      gap: 18px;
      align-items: center;
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: 8px;
      overflow: hidden;
      padding-right: 18px;
    }
    .news-item img { width: 220px; height: 130px; object-fit: cover; }
    .news-item h3 { font-size: 18px; margin-bottom: 6px; }
    .news-item p { color: var(--muted); font-size: 14px; }
    .news-date { color: var(--air); font-size: 13px; font-weight: 600; min-width: 92px; text-align: right; }
    .news-more { margin-top: 18px; }

    .faq-list { display: grid; gap: 10px; max-width: 920px; }
    .faq-item { background: var(--card); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
    .faq-q {
      width: 100%;
      text-align: left;
      background: transparent;
      border: 0;
      min-height: 56px;
      padding: 14px 18px;
      font-size: 16px;
      font-weight: 600;
      color: var(--char);
      display: flex;
      justify-content: space-between;
      gap: 12px;
      align-items: center;
    }
    .faq-q span.plus { width: 22px; height: 22px; border: 1px solid var(--steel); border-radius: 50%; display: grid; place-items: center; flex-shrink: 0; font-size: 16px; }
    .faq-a { display: none; padding: 0 18px 16px; color: var(--muted); font-size: 15px; }
    .faq-item.is-open .faq-a { display: block; }
    .faq-item.is-open { border-color: var(--air); }
    .faq-item.is-open .faq-q span.plus { background: var(--air); color: #fff; border-color: var(--air); }

    #cta { background: #f7efe4; }
    .cta-grid {
      display: grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 32px;
      align-items: start;
    }
    .form-card {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: 10px;
      padding: 26px;
      box-shadow: var(--shadow);
    }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
    .field { display: flex; flex-direction: column; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    label { font-size: 13px; font-weight: 600; color: var(--steel); }
    input, select, textarea {
      height: 48px;
      border: 1px solid var(--line-strong);
      border-radius: 8px;
      padding: 0 12px;
      background: #fff;
      color: var(--text);
      font-size: 15px;
    }
    textarea { height: 96px; padding: 10px 12px; resize: vertical; }
    input.is-err, select.is-err, textarea.is-err { border-color: var(--warn); background: #fff6ef; }
    .err { color: var(--warn-deep); font-size: 12px; min-height: 16px; }
    .form-ok {
      display: none;
      padding: 28px 8px;
      text-align: center;
    }
    .form-ok h3 { margin-bottom: 8px; }
    .contact-box {
      background: var(--steel);
      color: #fff;
      border-radius: 10px;
      padding: 28px 26px;
    }
    .contact-box h3 { color: #fff; margin-bottom: 10px; }
    .contact-box p { color: rgba(244,241,234,.8); font-size: 15px; margin-bottom: 18px; }
    .contact-list { display: grid; gap: 12px; }
    .contact-list a, .contact-list span { color: #fff; display: block; }
    .contact-list b { display: block; font-size: 12px; color: #9fd0cd; font-weight: 600; letter-spacing: .08em; }

    .site-footer {
      background: #161a1c;
      color: rgba(244,241,234,.78);
      padding: 56px 0 28px;
    }
    .foot-grid {
      display: grid;
      grid-template-columns: 1.3fr .9fr .9fr 1fr;
      gap: 28px;
      margin-bottom: 28px;
    }
    .site-footer h3 { color: #fff; font-size: 16px; margin-bottom: 12px; }
    .site-footer a { color: rgba(244,241,234,.78); display: inline-block; min-height: 32px; }
    .site-footer a:hover { color: #f0c09a; }
    .foot-brand strong { display: block; color: #fff; font-size: 18px; margin-bottom: 8px; }
    .icp { border-top: 1px solid rgba(244,241,234,.12); padding-top: 16px; font-size: 13px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

    .dock {
      position: fixed;
      left: 0; right: 0; bottom: 0;
      z-index: 40;
      background: var(--char);
      color: #fff;
      border-top: 1px solid rgba(224,122,61,.45);
      min-height: 64px;
      display: flex;
      align-items: center;
    }
    .dock-inner {
      width: min(100% - 24px, var(--container));
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
    }
    .dock p { font-size: 14px; color: rgba(244,241,234,.8); }
    .dock-actions { display: flex; gap: 8px; }

    .drawer {
      position: fixed;
      inset: 0;
      background: rgba(28,33,36,.46);
      z-index: 60;
      display: none;
    }
    .drawer.is-open { display: block; }
    .drawer-panel {
      position: absolute;
      top: 0; right: 0; bottom: 0;
      width: min(86vw, 360px);
      background: var(--bg);
      padding: 24px 18px;
      overflow: auto;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .drawer-panel a {
      min-height: 48px;
      display: flex;
      align-items: center;
      color: var(--char);
      font-weight: 600;
      border-bottom: 1px solid var(--line);
    }
    .drawer-close {
      align-self: flex-end;
      width: 44px; height: 44px;
      border: 1px solid var(--line);
      background: var(--card);
      border-radius: 8px;
    }

    @media (max-width: 1440px) {
      .hero h1, .hero-title { font-size: 38px; }
      .h2 { font-size: 30px; }
    }
    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .menu-toggle { display: inline-flex; }
      .hero-grid, .split, .fn-layout, .fn-panel.is-on, .prod-layout, .demo-wrap, .case-grid, .story-main, .cta-grid, .foot-grid {
        grid-template-columns: 1fr;
      }
      .param-bar, .cap-grid, .plan-grid, .stats { grid-template-columns: repeat(2, 1fr); }
      .scene-grid { grid-template-columns: 1fr 1fr; grid-template-rows: auto; }
      .scene-card:first-child { grid-row: auto; min-height: 280px; }
      .review-wall { grid-template-columns: 1fr 1fr; }
      .review:nth-child(1), .review:nth-child(6) { grid-column: auto; }
      .news-item { grid-template-columns: 180px 1fr; padding-right: 0; }
      .news-date { display: none; }
      .hero { min-height: 0; }
      .hero-slide, .hero-grid { min-height: 0; }
      .media-frame img { height: 360px; }
      .fn-index { position: static; flex-direction: row; overflow-x: auto; }
      .fn-btn { white-space: nowrap; }
      .topbar-left span.hide-tab { display: none; }
    }
    @media (max-width: 768px) {
      body { font-size: 16px; }
      .section { padding: 64px 0; }
      .hero h1, .hero-title { font-size: 30px; }
      .h2 { font-size: 26px; }
      .h3 { font-size: 20px; }
      .container { width: min(100% - 28px, var(--container)); }
      .topbar { height: auto; line-height: 1.4; font-size: 12px; }
      .topbar-inner { height: auto; padding: 8px 0; }
      .topbar-right { display: none; }
      .sell-strip, .side-notes, .form-grid, .voice-extra, .stats { grid-template-columns: 1fr; }
      .scene-grid, .cap-grid, .plan-grid { grid-template-columns: 1fr; }
      .param-bar { grid-template-columns: 1fr 1fr; }
      .news-item { grid-template-columns: 1fr; }
      .news-item img { width: 100%; height: 180px; }
      .hero-stage img, .demo-stage img, .prod-main img { height: 210px; }
      .media-frame img, .story-main img { height: 240px; min-height: 240px; }
      .demo-stage { min-height: 210px; }
      .icp { flex-direction: column; }
      .dock p { display: none; }
    }
    @media (max-width: 520px) {
      .hero-actions, .dock-actions { width: 100%; }
      .hero-actions .btn, .dock-actions .btn { flex: 1; }
      .logo-text span { display: none; }
      .nav-cta .btn { padding: 0 10px; font-size: 13px; }
    }
    @media (max-width: 375px) {
      .hero h1, .hero-title { font-size: 26px; }
      .h2 { font-size: 24px; }
      .btn { min-height: 44px; }
    }