/* roulang page: index */
:root {
      --bg-0: #070B14;
      --bg-1: #0A1628;
      --bg-2: #10233F;
      --bg-3: #163056;
      --bg-4: #1B3A5C;
      --blue: #2F7BFF;
      --blue-2: #3A8DFF;
      --blue-deep: #1A4DB3;
      --al: #C5D0DC;
      --ice: #E8F3FF;
      --text: #E7EEF7;
      --muted: #9AA8B8;
      --faint: #6E7D8F;
      --line: rgba(197, 208, 220, .22);
      --line-strong: rgba(58, 141, 255, .38);
      --glass: rgba(16, 35, 63, .48);
      --glass-2: rgba(10, 22, 40, .72);
      --glass-3: rgba(7, 11, 20, .78);
      --amber: #E0A24A;
      --danger: #D16A4A;
      --ok: #3ECF8E;
      --r: 14px;
      --r-sm: 10px;
      --r-xs: 8px;
      --shadow: 0 12px 40px rgba(0, 0, 0, .38), 0 0 0 1px rgba(47, 123, 255, .16), 0 0 28px rgba(47, 123, 255, .1);
      --shadow-soft: 0 8px 24px rgba(0, 0, 0, .28);
      --glow: 0 0 22px rgba(47, 123, 255, .48);
      --container: 1220px;
      --header-top: 38px;
      --nav-h: 70px;
      --font: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --mono: "JetBrains Mono", ui-monospace, monospace;
      --space: 88px;
      --gutter: 22px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    html, body { margin: 0; padding: 0; }
    body {
      font-family: var(--font);
      font-size: 16px;
      line-height: 1.78;
      color: var(--text);
      background: var(--bg-0);
      min-width: 320px;
      overflow-x: hidden;
    }
    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: 0;
      opacity: .35;
      background-image:
        repeating-linear-gradient(90deg, transparent 0 11px, rgba(197, 208, 220, .03) 11px 12px),
        repeating-linear-gradient(0deg, transparent 0 11px, rgba(197, 208, 220, .025) 11px 12px);
    }
    img { max-width: 100%; display: block; height: auto; border: 0; }
    a { color: var(--ice); text-decoration: none; transition: color .2s ease, opacity .2s ease; }
    a:hover { color: var(--blue-2); }
    a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
      outline: 2px solid var(--blue-2);
      outline-offset: 3px;
      box-shadow: 0 0 0 4px rgba(47, 123, 255, .28);
    }
    button, input, textarea, select { font-family: inherit; }
    button { cursor: pointer; }
    ul, ol { margin: 0; padding: 0; }
    h1, h2, h3, h4, p { margin: 0; }
    .container { width: min(100% - 36px, var(--container)); margin-inline: auto; }
    .skip {
      position: absolute; left: -999px; top: 8px;
    }
    .skip:focus { left: 12px; z-index: 80; background: var(--blue); color: #fff; padding: 8px 12px; border-radius: 8px; }
    .site-header {
      position: sticky; top: 0; z-index: 50;
      isolation: isolate;
    }
    .topbar {
      height: var(--header-top);
      background: linear-gradient(90deg, #08101c, #0d1b30 40%, #0a1628);
      border-bottom: 1px solid var(--line);
      display: flex; align-items: center;
      font-size: 12px; color: var(--al);
      letter-spacing: .02em;
    }
    .topbar .container { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
    .topbar-left, .topbar-right { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
    .topbar a { color: var(--al); }
    .topbar a:hover { color: #fff; }
    .micro {
      display: inline-flex; align-items: center; gap: 6px;
      padding: 2px 8px; border-radius: 999px;
      border: 1px solid rgba(58, 141, 255, .35);
      background: rgba(47, 123, 255, .1);
      color: var(--ice); font-weight: 500;
    }
    .navbar {
      height: var(--nav-h);
      display: flex; align-items: center;
      background: rgba(10, 22, 40, .62);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(197, 208, 220, .12);
      transition: background .25s ease, box-shadow .25s ease;
    }
    .site-header.is-stuck .navbar {
      background: rgba(7, 11, 20, .88);
      box-shadow: 0 10px 30px rgba(0, 0, 0, .35);
    }
    .navbar .container { display: flex; align-items: center; gap: 18px; }
    .brand {
      display: flex; align-items: center; gap: 10px; color: #fff; flex-shrink: 0;
    }
    .brand:hover { color: #fff; opacity: .92; }
    .brand-mark {
      width: 36px; height: 36px; border-radius: 10px;
      background: radial-gradient(circle at 30% 30%, #7eb0ff, #2f7bff 46%, #163056);
      box-shadow: var(--glow);
      display: grid; place-items: center;
      border: 1px solid rgba(232, 243, 255, .35);
    }
    .brand-text { display: flex; flex-direction: column; line-height: 1.15; }
    .brand-text strong { font-size: 16px; font-weight: 700; letter-spacing: .04em; }
    .brand-text span { font-size: 11px; color: var(--al); font-weight: 500; }
    .nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
    .nav-links a {
      color: var(--al); font-size: 14px; font-weight: 500;
      padding: 8px 10px; border-radius: 8px; min-height: 44px;
      display: inline-flex; align-items: center;
    }
    .nav-links a:hover, .nav-links a.is-active { color: #fff; background: rgba(47, 123, 255, .14); }
    .nav-cta { margin-left: 8px; flex-shrink: 0; }
    .nav-phone, .menu-toggle { display: none; }
    .menu-toggle {
      width: 44px; height: 44px; border-radius: 10px;
      border: 1px solid var(--line); background: rgba(16, 35, 63, .6); color: #fff;
      align-items: center; justify-content: center; flex-direction: column; gap: 5px;
    }
    .menu-toggle span { width: 18px; height: 2px; background: #fff; display: block; border-radius: 2px; }
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      min-height: 44px; padding: 0 18px; border-radius: 12px;
      font-size: 14px; font-weight: 600; border: 1px solid transparent;
      transition: transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease, filter .18s ease;
      text-decoration: none; white-space: nowrap;
    }
    .btn-primary {
      background: linear-gradient(180deg, #4a98ff, var(--blue));
      color: #fff; box-shadow: var(--glow), inset 0 1px 0 rgba(255,255,255,.28);
    }
    .btn-primary:hover { transform: translateY(-2px); filter: brightness(1.08); box-shadow: 0 0 32px rgba(47,123,255,.7), 0 10px 20px rgba(0,0,0,.25); color: #fff; }
    .btn-primary:active { transform: translateY(0); filter: brightness(.96); }
    .btn-ghost {
      background: rgba(16, 35, 63, .45);
      border-color: rgba(197, 208, 220, .28);
      color: var(--ice); backdrop-filter: blur(12px);
    }
    .btn-ghost:hover { border-color: var(--blue-2); color: #fff; box-shadow: 0 0 0 1px rgba(58,141,255,.35); }
    .btn-line { background: transparent; border-color: rgba(58,141,255,.45); color: var(--ice); }
    .btn-line:hover { background: rgba(47,123,255,.12); color: #fff; }
    main { position: relative; z-index: 1; }
    section[id] { scroll-margin-top: 118px; }
    .hero {
      position: relative; min-height: calc(100vh - 108px);
      min-height: 640px; overflow: hidden;
      background: var(--bg-1);
    }
    .slides { position: relative; min-height: inherit; }
    .slide {
      position: absolute; inset: 0; opacity: 0; visibility: hidden;
      transition: opacity .6s ease, visibility .6s ease;
    }
    .slide.is-active { opacity: 1; visibility: visible; position: relative; min-height: inherit; }
    .slide img {
      position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
      filter: saturate(.85) contrast(1.05);
    }
    .slide-mask {
      position: absolute; inset: 0;
      background:
        linear-gradient(90deg, rgba(7,11,20,.88) 0%, rgba(10,22,40,.72) 42%, rgba(10,22,40,.38) 100%),
        linear-gradient(180deg, rgba(7,11,20,.2), rgba(7,11,20,.55));
    }
    .slide-mask::after {
      content: ""; position: absolute; inset: 0;
      background-image:
        linear-gradient(rgba(58,141,255,.07) 1px, transparent 1px),
        linear-gradient(90deg, rgba(58,141,255,.07) 1px, transparent 1px);
      background-size: 42px 42px;
      mask-image: linear-gradient(90deg, rgba(0,0,0,.55), transparent 70%);
    }
    .slide-body {
      position: relative; z-index: 2;
      min-height: inherit; display: flex; align-items: center;
      padding: 72px 0 92px;
    }
    .kicker {
      display: inline-flex; align-items: center; gap: 8px;
      color: var(--al); font-size: 13px; font-weight: 600; letter-spacing: .12em;
      margin-bottom: 16px;
    }
    .kicker i {
      width: 28px; height: 1px; background: var(--blue-2); display: inline-block;
    }
    .hero h1 {
      font-size: clamp(32px, 4.6vw, 52px);
      line-height: 1.18; font-weight: 700; max-width: 18em;
      text-shadow: 0 8px 30px rgba(0,0,0,.45);
    }
    .hero-lead {
      margin-top: 18px; max-width: 640px; color: var(--al);
      font-size: 16px; line-height: 1.85;
    }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
    .spec-row {
      display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px;
    }
    .spec-chip {
      font-family: var(--mono); font-size: 12px; color: var(--ice);
      border: 1px solid rgba(197,208,220,.22); background: rgba(7,11,20,.45);
      border-radius: 8px; padding: 8px 10px;
    }
    .carousel-nav {
      position: absolute; inset: auto 18px 22px auto; z-index: 3;
      display: flex; align-items: center; gap: 10px;
    }
    .carousel-btn {
      width: 44px; height: 44px; border-radius: 12px; border: 1px solid var(--line);
      background: rgba(10,22,40,.55); color: #fff; backdrop-filter: blur(12px);
    }
    .carousel-btn:hover { border-color: var(--blue-2); box-shadow: var(--glow); }
    .dots { display: flex; gap: 8px; }
    .dots button {
      width: 10px; height: 10px; border-radius: 50%; border: 0;
      background: rgba(232,243,255,.35); padding: 0; min-height: 10px;
    }
    .dots button.is-on { width: 26px; border-radius: 999px; background: var(--blue-2); box-shadow: var(--glow); }
    .section { padding: var(--space) 0; position: relative; }
    .section-alt { background: linear-gradient(180deg, rgba(16,35,63,.35), rgba(7,11,20,0)); }
    .section-head { margin-bottom: 36px; max-width: 760px; }
    .section-head h2 {
      font-size: clamp(24px, 3vw, 34px); font-weight: 700; line-height: 1.25;
    }
    .section-head p { margin-top: 12px; color: var(--muted); font-size: 15px; line-height: 1.85; }
    .eyebrow {
      color: var(--blue-2); font-size: 12px; font-weight: 700; letter-spacing: .16em;
      margin-bottom: 10px;
    }
    .split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 40px; align-items: center; }
    .glass {
      background: var(--glass);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(197,208,220,.16);
      box-shadow: var(--shadow);
      border-radius: var(--r);
    }
    .media-frame {
      border-radius: 16px; overflow: hidden; position: relative;
      border: 1px solid rgba(197,208,220,.2);
      box-shadow: var(--shadow);
    }
    .media-frame img { width: 100%; height: 460px; object-fit: cover; }
    .spec-bar {
      display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
      margin-top: 18px; background: rgba(197,208,220,.12);
      border-radius: 12px; overflow: hidden; border: 1px solid var(--line);
    }
    .spec-bar div { background: rgba(10,22,40,.72); padding: 14px 12px; }
    .spec-bar b { display: block; font-family: var(--mono); color: var(--ice); font-size: 14px; }
    .spec-bar span { color: var(--muted); font-size: 12px; }
    .intro-copy h2 { margin-bottom: 14px; font-size: clamp(24px, 3vw, 34px); }
    .intro-copy p { color: var(--muted); margin-bottom: 14px; }
    .check-list { list-style: none; display: grid; gap: 10px; margin-top: 8px; }
    .check-list li {
      display: flex; gap: 10px; color: var(--al); font-size: 14px;
    }
    .check-list li::before {
      content: ""; width: 10px; height: 10px; margin-top: 8px; flex-shrink: 0;
      border-radius: 2px; background: var(--blue-2); box-shadow: var(--glow);
    }
    .adv-grid {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
    }
    .adv-card {
      padding: 22px; min-height: 230px;
      transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
    }
    .adv-card:hover { transform: translateY(-4px); border-color: var(--line-strong); }
    .adv-ico {
      width: 42px; height: 42px; border-radius: 12px;
      display: grid; place-items: center;
      background: linear-gradient(180deg, rgba(58,141,255,.25), rgba(16,35,63,.4));
      border: 1px solid rgba(58,141,255,.35); margin-bottom: 14px;
      color: var(--ice);
    }
    .adv-card h3 { font-size: 18px; margin-bottom: 8px; }
    .adv-card ul { list-style: none; color: var(--muted); font-size: 14px; display: grid; gap: 6px; }
    .scene-rail { display: grid; gap: 14px; }
    .scene-item {
      display: grid; grid-template-columns: 180px 1fr 220px; gap: 18px; align-items: center;
      padding: 16px; border-radius: 14px;
    }
    .scene-item h3 { font-size: 18px; }
    .scene-item p { color: var(--muted); font-size: 14px; }
    .scene-item img { width: 100%; height: 96px; object-fit: cover; border-radius: 10px; }
    .demo-stage {
      display: grid; grid-template-columns: 1.4fr .8fr; gap: 22px;
    }
    .demo-canvas { position: relative; overflow: hidden; min-height: 420px; }
    .demo-canvas img { width: 100%; height: 100%; min-height: 420px; object-fit: cover; }
    .hotspot {
      position: absolute; width: 18px; height: 18px; border-radius: 50%;
      background: var(--blue-2); box-shadow: 0 0 0 8px rgba(47,123,255,.25), var(--glow);
      border: 2px solid #fff;
    }
    .hotspot::after {
      content: attr(data-label);
      position: absolute; left: 26px; top: -6px; white-space: nowrap;
      background: rgba(7,11,20,.82); color: #fff; font-size: 12px; font-weight: 600;
      padding: 6px 8px; border-radius: 8px; border: 1px solid var(--line);
    }
    .steps { display: grid; gap: 12px; }
    .step {
      padding: 16px 18px; border-radius: 12px;
    }
    .step b { display: block; font-size: 15px; margin-bottom: 4px; }
    .step span { color: var(--muted); font-size: 14px; }
    .step em { font-style: normal; font-family: var(--mono); color: var(--blue-2); font-size: 12px; }
    .hot-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .hot-card { overflow: hidden; display: flex; flex-direction: column; }
    .hot-card img { height: 220px; width: 100%; object-fit: cover; }
    .hot-card .pad { padding: 20px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
    .hot-card h3 { font-size: 20px; }
    .tag {
      display: inline-flex; align-items: center; width: fit-content;
      font-size: 12px; color: var(--ice); background: rgba(47,123,255,.16);
      border: 1px solid rgba(58,141,255,.3); border-radius: 999px; padding: 4px 10px;
    }
    .tag-amber { background: rgba(224,162,74,.12); border-color: rgba(224,162,74,.4); color: var(--amber); }
    .hot-card p { color: var(--muted); font-size: 14px; flex: 1; }
    .chip-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
    .chip {
      display: inline-flex; align-items: center; min-height: 44px; padding: 0 16px;
      border-radius: 999px; border: 1px solid var(--line);
      background: rgba(16,35,63,.5); color: var(--ice); font-weight: 600; font-size: 14px;
    }
    .chip:hover { border-color: var(--blue-2); color: #fff; box-shadow: var(--glow); }
    .sys-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 28px; align-items: start; }
    .sys-panel { padding: 24px; }
    .sys-panel h3 { margin: 8px 0 10px; font-size: 20px; }
    .sys-panel p { color: var(--muted); font-size: 14px; }
    .dark-band {
      background:
        linear-gradient(180deg, rgba(7,11,20,.72), rgba(7,11,20,.86)),
        url("/assets/images/421adfdb3e557f48.jpg") center/cover no-repeat;
      border-block: 1px solid rgba(58,141,255,.2);
    }
    .case-layout { display: grid; grid-template-columns: 1.15fr .85fr; gap: 32px; align-items: center; }
    .timeline { position: relative; display: grid; gap: 18px; }
    .timeline::before {
      content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 1px;
      background: linear-gradient(180deg, var(--blue-2), transparent);
    }
    .tl-item { padding-left: 32px; position: relative; }
    .tl-item::before {
      content: ""; position: absolute; left: 2px; top: 8px; width: 12px; height: 12px;
      border-radius: 50%; background: var(--blue-2); box-shadow: var(--glow);
    }
    .tl-item h3 { font-size: 18px; margin-bottom: 6px; }
    .tl-item p { color: var(--al); font-size: 14px; }
    .tl-meta { font-family: var(--mono); font-size: 12px; color: var(--blue-2); margin-bottom: 4px; }
    .price-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .price-card {
      padding: 22px 18px; border-radius: var(--r-sm);
      background: rgba(10,22,40,.78);
      border: 1px solid rgba(197,208,220,.16);
      display: flex; flex-direction: column; gap: 10px; min-height: 360px;
    }
    .price-card.featured {
      border-color: rgba(58,141,255,.55);
      box-shadow: var(--glow);
      background: linear-gradient(180deg, rgba(47,123,255,.16), rgba(10,22,40,.86));
    }
    .price-card h3 { font-size: 18px; }
    .price { font-family: var(--mono); font-size: 22px; color: #fff; }
    .price small { font-size: 12px; color: var(--muted); font-weight: 500; }
    .price-card ul { list-style: none; color: var(--muted); font-size: 13px; display: grid; gap: 8px; flex: 1; }
    .story-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
    .story {
      display: grid; grid-template-columns: 168px 1fr; gap: 16px; overflow: hidden;
    }
    .story img { width: 100%; height: 100%; min-height: 220px; object-fit: cover; }
    .story .pad { padding: 20px 20px 20px 0; }
    .story blockquote { font-size: 16px; font-weight: 600; line-height: 1.6; }
    .story p { color: var(--muted); font-size: 14px; margin-top: 10px; }
    .stats {
      background:
        linear-gradient(90deg, rgba(7,11,20,.82), rgba(16,35,63,.7)),
        url("/assets/images/70d4210b60912c7f.jpg") center/cover no-repeat;
      border-block: 1px solid rgba(58,141,255,.25);
      padding: 48px 0;
    }
    .stat-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; text-align: center; }
    .stat b {
      display: block; font-family: var(--mono); font-size: clamp(28px, 4vw, 40px);
      color: #fff; text-shadow: 0 0 18px rgba(58,141,255,.7);
    }
    .stat span { color: var(--al); font-size: 13px; }
    .review-wall {
      columns: 3; column-gap: 16px;
    }
    .quote {
      break-inside: avoid; margin-bottom: 16px; padding: 16px 18px;
      border-radius: 12px;
    }
    .quote p { font-size: 14px; color: var(--ice); }
    .quote footer { margin-top: 10px; display: flex; justify-content: space-between; gap: 8px; color: var(--muted); font-size: 12px; }
    .logo-marquee {
      overflow: hidden; mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
    }
    .logo-track {
      display: flex; gap: 14px; width: max-content; animation: marquee 28s linear infinite;
    }
    .cert {
      min-width: 180px; height: 84px; border-radius: 12px; padding: 12px 14px;
      display: flex; flex-direction: column; justify-content: center; gap: 4px;
    }
    .cert b { font-size: 14px; }
    .cert span { font-size: 12px; color: var(--muted); }
    @keyframes marquee { to { transform: translateX(-50%); } }
    .news-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 16px; }
    .news-card { overflow: hidden; display: flex; flex-direction: column; }
    .news-card img { height: 170px; object-fit: cover; width: 100%; }
    .news-card.lead img { height: 240px; }
    .news-card .pad { padding: 16px 18px 20px; }
    .news-card time { font-family: var(--mono); font-size: 12px; color: var(--blue-2); }
    .news-card h3 { font-size: 17px; margin: 8px 0; }
    .news-card p { color: var(--muted); font-size: 14px; }
    .faq-list { display: grid; gap: 10px; }
    .faq-item { border-radius: var(--r-sm); overflow: hidden; }
    .faq-item button {
      width: 100%; text-align: left; background: transparent; color: #fff;
      border: 0; padding: 16px 18px; font-size: 16px; font-weight: 600;
      display: flex; justify-content: space-between; align-items: center; gap: 12px; min-height: 52px;
    }
    .faq-item button svg { transition: transform .2s ease; flex-shrink: 0; }
    .faq-item.is-open button svg { transform: rotate(180deg); }
    .faq-item .ans {
      display: none; padding: 0 18px 16px; color: var(--al); font-size: 14px; line-height: 1.8;
      background: rgba(47,123,255,.06);
    }
    .faq-item.is-open .ans { display: block; }
    .cta-band {
      background:
        linear-gradient(180deg, rgba(7,11,20,.78), rgba(10,22,40,.88)),
        url("/assets/images/c9fb693506d5ddce.jpg") center/cover no-repeat;
    }
    .cta-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 28px; align-items: stretch; }
    .contact-side { padding: 28px; }
    .contact-side h2 { font-size: 30px; margin: 8px 0 12px; }
    .contact-side p { color: var(--muted); }
    .contact-dl { margin-top: 22px; display: grid; gap: 12px; }
    .contact-dl div {
      display: flex; justify-content: space-between; gap: 12px; padding: 12px 0;
      border-bottom: 1px solid var(--line); font-size: 14px;
    }
    .contact-dl dt { color: var(--faint); }
    .contact-dl dd { margin: 0; color: var(--ice); font-weight: 600; }
    .form-box { padding: 24px; }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
    .field { display: flex; flex-direction: column; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    label { font-size: 13px; color: var(--al); font-weight: 600; }
    input, textarea, select {
      min-height: 44px; border-radius: 10px; border: 1px solid var(--line);
      background: rgba(7,11,20,.7); color: #fff; padding: 10px 12px; font-size: 14px;
    }
    textarea { min-height: 88px; resize: vertical; }
    input.is-error, textarea.is-error, select.is-error { border-color: var(--danger); box-shadow: 0 0 0 3px rgba(209,106,74,.2); }
    .form-msg { display: none; margin-top: 12px; padding: 12px 14px; border-radius: 10px; font-size: 14px; }
    .form-msg.ok { display: block; background: rgba(62,207,142,.12); border: 1px solid rgba(62,207,142,.4); color: #b9f4d6; }
    .form-msg.err { display: block; background: rgba(209,106,74,.12); border: 1px solid rgba(209,106,74,.4); color: #f3c2b4; }
    .hint { font-size: 12px; color: var(--faint); }
    .site-footer {
      background: #05080f; border-top: 1px solid rgba(58,141,255,.18);
      padding: 48px 0 22px; position: relative; z-index: 1;
    }
    .foot-grid { display: grid; grid-template-columns: 1.3fr .8fr .8fr 1fr; gap: 28px; }
    .site-footer h3 { font-size: 15px; margin-bottom: 12px; }
    .site-footer p, .site-footer a, .site-footer li { color: var(--muted); font-size: 14px; }
    .site-footer ul { list-style: none; display: grid; gap: 8px; }
    .site-footer a:hover { color: #fff; }
    .legal {
      margin-top: 28px; padding-top: 16px; border-top: 1px solid rgba(197,208,220,.1);
      display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
      color: var(--faint); font-size: 12px;
    }
    .drawer {
      position: fixed; inset: 0 0 0 auto; width: min(88vw, 360px);
      background: rgba(7,11,20,.96); backdrop-filter: blur(18px);
      transform: translateX(100%); transition: transform .25s ease;
      z-index: 70; padding: 22px; display: flex; flex-direction: column; gap: 14px;
      border-left: 1px solid var(--line);
    }
    .drawer.is-open { transform: none; }
    .drawer a { color: #fff; min-height: 44px; display: flex; align-items: center; border-bottom: 1px solid rgba(197,208,220,.08); }
    .backdrop {
      position: fixed; inset: 0; background: rgba(0,0,0,.45); z-index: 60; display: none;
    }
    .backdrop.is-on { display: block; }
    @media (max-width: 1280px) {
      .hot-grid, .price-grid { gap: 12px; }
    }
    @media (max-width: 1024px) {
      .nav-links, .nav-cta { display: none; }
      .menu-toggle, .nav-phone { display: inline-flex; }
      .navbar .container { justify-content: space-between; }
      .split, .demo-stage, .sys-grid, .case-layout, .cta-grid, .story-grid { grid-template-columns: 1fr; }
      .scene-item { grid-template-columns: 1fr; }
      .adv-grid, .price-grid, .stat-row { grid-template-columns: repeat(2, 1fr); }
      .news-grid { grid-template-columns: 1fr 1fr; }
      .review-wall { columns: 2; }
      .foot-grid { grid-template-columns: 1fr 1fr; }
      .story { grid-template-columns: 140px 1fr; }
      .media-frame img { height: 320px; }
      .spec-bar { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      :root { --space: 64px; }
      .topbar { display: none; }
      .hero { min-height: 560px; }
      .hero h1 { font-size: 30px; }
      .adv-grid, .hot-grid, .price-grid, .news-grid, .stat-row, .foot-grid { grid-template-columns: 1fr; }
      .review-wall { columns: 1; }
      .form-grid { grid-template-columns: 1fr; }
      .story { grid-template-columns: 1fr; }
      .story .pad { padding: 16px; }
      .carousel-nav { inset: auto 12px 14px auto; }
      .legal { flex-direction: column; }
    }
    @media (max-width: 520px) {
      .container { width: min(100% - 24px, var(--container)); }
      .hero { min-height: 520px; }
      .btn { width: 100%; }
      .hero-actions { width: 100%; }
      .spec-chip { font-size: 11px; }
      .brand-text span { display: none; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      .logo-track { animation: none; }
      .slide { transition: none; }
    }

/* roulang page: index */
:root{--bg:#070b10;--bg-2:#10161d;--asphalt:#0c1117;--steel:#6d8798;--steel-2:#8aa3b3;--cold:#79c4d2;--cold-2:#b7e4ec;--amber:#d4893a;--amber-2:#f0b36a;--text:#e8eef2;--text-2:#c5d0d8;--muted:#8b99a6;--line:rgba(176,198,214,.18);--line-2:rgba(176,198,214,.32);--glass:rgba(14,22,30,.62);--glow:0 0 28px rgba(212,137,58,.38);--glow-cold:0 0 24px rgba(121,196,210,.22);--shadow:0 18px 40px rgba(0,0,0,.35);--radius:10px;--radius-lg:14px;--container:1240px;--mono:"JetBrains Mono","SFMono-Regular",ui-monospace,monospace;--sans:"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}
    body{font-family:var(--sans);font-size:16px;line-height:1.78;color:var(--text);background:radial-gradient(1200px 500px at 80% -10%,rgba(121,196,210,.08),transparent 55%),linear-gradient(180deg,#080c11 0%,#0b1016 40%,#090d12 100%);min-height:100%}
    img{max-width:100%;height:auto;display:block}
    a{color:var(--cold);text-decoration:none;transition:color .2s ease}
    a:hover{color:var(--cold-2)}
    a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:2px solid var(--amber-2);outline-offset:3px}
    button,input,textarea,select{font-family:inherit}
    button{cursor:pointer}
    h1,h2,h3{margin:0 0 12px;line-height:1.28;letter-spacing:.01em;font-weight:700}
    h1{font-size:clamp(32px,4.6vw,56px)}
    h2{font-size:clamp(24px,2.6vw,36px)}
    h3{font-size:20px}
    p{margin:0 0 14px;color:var(--text-2)}
    ul{margin:0;padding:0;list-style:none}
    .container{width:min(100% - 40px,var(--container));margin:0 auto}
    .kicker{display:inline-flex;align-items:center;gap:8px;font-size:12px;letter-spacing:.16em;color:var(--cold);font-family:var(--mono);font-weight:600;margin-bottom:14px}
    .kicker::before{content:"";width:18px;height:1px;background:var(--amber);box-shadow:0 0 8px var(--amber)}
    .badge{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line-2);background:rgba(121,196,210,.08);color:var(--cold-2);font-size:12px;padding:4px 10px;border-radius:999px}
    .tag{display:inline-block;padding:5px 10px;margin:0 8px 8px 0;border:1px solid var(--line);border-radius:6px;color:var(--text-2);background:rgba(255,255,255,.03);font-size:13px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 20px;border-radius:9px;border:1px solid transparent;font-weight:700;font-size:15px;transition:.2s ease}
    .btn-glow{color:#1a120a;background:linear-gradient(180deg,var(--amber-2),var(--amber));box-shadow:var(--glow),inset 0 1px 0 rgba(255,255,255,.45)}
    .btn-glow:hover{transform:translateY(-1px);filter:brightness(1.08)}
    .btn-glow:active{transform:translateY(0);filter:brightness(.96)}
    .btn-ghost{color:var(--text);background:rgba(18,28,38,.45);border-color:var(--line-2);backdrop-filter:blur(12px)}
    .btn-ghost:hover{border-color:var(--cold);color:var(--cold-2);box-shadow:var(--glow-cold)}
    .section{padding:92px 0;position:relative}
    .section-head{max-width:760px;margin-bottom:36px}
    .glass{background:var(--glass);border:1px solid var(--line);box-shadow:inset 0 1px 0 rgba(255,255,255,.08),var(--shadow);backdrop-filter:blur(16px);border-radius:var(--radius)}
    .site-header{position:sticky;top:0;z-index:80;background:rgba(8,12,17,.82);border-bottom:1px solid var(--line);backdrop-filter:blur(18px)}
    .topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:38px;font-size:13px;color:var(--muted);border-bottom:1px solid rgba(176,198,214,.1)}
    .topbar-left,.topbar-right{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
    .topbar a{color:var(--text-2)}
    .topbar a:hover{color:var(--cold-2)}
    .dot{width:6px;height:6px;border-radius:50%;background:#3dca8a;box-shadow:0 0 8px #3dca8a;display:inline-block}
    .nav-row{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:70px}
    .logo{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:800;font-size:18px}
    .logo-mark{width:34px;height:34px;border-radius:8px;border:1px solid var(--line-2);background:linear-gradient(160deg,rgba(121,196,210,.2),rgba(12,18,24,.8));display:grid;place-items:center}
    .logo-mark svg{width:20px;height:20px}
    .nav-links{display:flex;align-items:center;gap:6px}
    .nav-links a{color:var(--text-2);font-size:14px;font-weight:500;padding:10px;position:relative;min-height:44px;display:inline-flex;align-items:center}
    .nav-links a::after{content:"";position:absolute;left:10px;right:10px;bottom:6px;height:2px;background:var(--cold);transform:scaleX(0);transform-origin:left;transition:.2s;box-shadow:0 0 8px var(--cold)}
    .nav-links a:hover,.nav-links a.active{color:var(--text)}
    .nav-links a.active::after,.nav-links a:hover::after{transform:scaleX(1)}
    .nav-cta{display:flex;align-items:center;gap:10px}
    .menu-toggle{display:none;width:44px;height:44px;border-radius:8px;border:1px solid var(--line);background:transparent;color:var(--text)}
    .menu-toggle span,.menu-toggle span::before,.menu-toggle span::after{display:block;width:18px;height:2px;background:var(--text);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}
    .site-header.compact .topbar{display:none}
    .drawer{display:none;position:fixed;inset:0;z-index:90;background:rgba(4,7,10,.86);backdrop-filter:blur(16px)}
    .drawer.open{display:block}
    .drawer-panel{width:min(100%,380px);height:100%;margin-left:auto;background:#0d141b;border-left:1px solid var(--line);padding:24px}
    .drawer a{display:flex;align-items:center;min-height:48px;color:var(--text);border-bottom:1px solid var(--line);font-size:16px}
    .hero{position:relative;min-height:calc(100vh - 108px);overflow:hidden}
    .hero-slides{position:absolute;inset:0}
    .hero-slide{position:absolute;inset:0;opacity:0;transition:opacity .7s ease;background-size:cover;background-position:center}
    .hero-slide.active{opacity:1;z-index:1}
    .hero-slide::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,9,12,.86) 0%,rgba(6,9,12,.55) 46%,rgba(6,9,12,.28) 100%),radial-gradient(800px 400px at 20% 80%,rgba(212,137,58,.12),transparent 60%)}
    .hero-copy{position:relative;z-index:2;padding:88px 0 110px;max-width:760px}
    .hero-copy p.lead{font-size:17px;max-width:680px}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
    .spec-row{display:flex;gap:18px;flex-wrap:wrap;margin-top:28px;color:var(--muted);font-family:var(--mono);font-size:12px}
    .spec-row b{color:var(--amber-2);font-weight:600}
    .hero-nav{position:absolute;z-index:3;left:0;right:0;bottom:28px;display:flex;align-items:center;justify-content:space-between}
    .hero-dots{display:flex;gap:8px}
    .hero-dots button{width:28px;height:4px;border:0;border-radius:4px;background:rgba(255,255,255,.28);padding:0}
    .hero-dots button.active{background:var(--amber);box-shadow:0 0 10px var(--amber)}
    .hero-arrows{display:flex;gap:8px}
    .hero-arrows button{width:44px;height:44px;border-radius:8px;border:1px solid var(--line-2);background:rgba(10,16,22,.5);color:var(--text);font-size:18px}
    .hero-arrows button:hover{border-color:var(--cold)}
    .intro-grid{display:grid;grid-template-columns:.42fr .58fr;gap:36px;align-items:center}
    .intro-photo{position:relative;border-radius:var(--radius-lg);overflow:hidden;min-height:420px;border:1px solid var(--line)}
    .intro-photo img{width:100%;height:100%;object-fit:cover;min-height:420px}
    .intro-float{position:absolute;left:16px;bottom:16px;right:16px;padding:14px 16px}
    .check-list{display:grid;gap:10px;margin-top:18px}
    .check-list li{padding-left:22px;position:relative;color:var(--text-2);font-size:15px}
    .check-list li::before{content:"";width:8px;height:8px;border-radius:1px;background:var(--amber);position:absolute;left:0;top:9px;box-shadow:0 0 8px var(--amber)}
    .chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
    .chip{min-height:44px;padding:0 14px;border-radius:8px;border:1px solid var(--line);background:rgba(255,255,255,.03);color:var(--text-2);font-weight:600}
    .chip.active{color:#1a120a;background:linear-gradient(180deg,var(--amber-2),var(--amber));border-color:transparent;box-shadow:var(--glow)}
    .group-panel{display:none;padding:28px}
    .group-panel.active{display:grid;grid-template-columns:1.1fr .9fr;gap:24px}
    .group-panel img{width:100%;height:260px;object-fit:cover;border-radius:10px}
    .bento{display:grid;grid-template-columns:repeat(12,1fr);gap:14px}
    .bento .card{padding:22px;min-height:170px}
    .span-7{grid-column:span 7}.span-5{grid-column:span 5}.span-4{grid-column:span 4}.span-12{grid-column:span 12}
    .card h3{margin-bottom:8px}.card p{font-size:15px}
    .card:hover{border-color:var(--line-2);transform:translateY(-2px);transition:.2s}
    .scene-track{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(280px,1fr);gap:16px;overflow-x:auto;padding-bottom:8px;scroll-snap-type:x mandatory}
    .scene-card{scroll-snap-align:start;overflow:hidden}
    .scene-card img{height:180px;width:100%;object-fit:cover}
    .scene-card .body{padding:16px 18px 20px}
    .product-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:16px}
    .product-card{overflow:hidden}
    .product-card img{height:230px;width:100%;object-fit:cover}
    .product-card .body{padding:20px}
    .spec{font-family:var(--mono);font-size:12px;color:var(--cold);margin:10px 0 16px}
    .demo{background:linear-gradient(180deg,rgba(8,12,17,.2),rgba(8,12,17,.65)),url("/assets/images/70d4210b60912c7f.jpg") center/cover}
    .demo-canvas{padding:18px}
    .demo-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
    .demo-view{display:none;position:relative}
    .demo-view.active{display:block}
    .demo-view img{width:100%;height:420px;object-fit:cover;border-radius:10px}
    .callout{position:absolute;padding:12px 14px;max-width:240px;font-size:13px}
    .c1{left:18px;top:18px}.c2{right:18px;bottom:18px}
    .mini-form{display:grid;grid-template-columns:1fr auto;gap:8px;margin-top:16px}
    .mini-form input,.field input{width:100%;min-height:46px;border-radius:8px;border:1px solid var(--line);background:rgba(7,12,16,.7);color:var(--text);padding:10px 12px}
    .note{font-size:13px;color:var(--muted);margin-top:8px}
    .cases{background:#070a0e;background-image:linear-gradient(rgba(121,196,210,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(121,196,210,.05) 1px,transparent 1px);background-size:42px 42px}
    .case-wrap{display:grid;grid-template-columns:.4fr .6fr;gap:28px}
    .case-cards{display:grid;gap:12px}
    .work-card{padding:18px 20px}
    .work-card .meta{font-family:var(--mono);font-size:12px;color:var(--amber-2);margin-bottom:8px}
    .plan-table{width:100%;border-collapse:collapse}
    .plan-table th,.plan-table td{text-align:left;padding:16px 14px;border-bottom:1px solid var(--line);vertical-align:top}
    .plan-table th{color:var(--muted);font-weight:500;font-size:13px}
    .plan-table td{color:var(--text-2)}
    .plan-table .rec{box-shadow:inset 0 0 0 1px var(--amber);background:rgba(212,137,58,.08)}
    .plan-name{color:var(--text);font-weight:700}
    .story-grid{display:grid;grid-template-columns:1.4fr .8fr;gap:16px}
    .story-main{display:grid;grid-template-columns:1fr 1fr;overflow:hidden}
    .story-main img{height:100%;min-height:320px;object-fit:cover}
    .quote{padding:28px}.quote p{font-size:18px;color:var(--text)}
    .side-notes{display:grid;gap:16px}
    .stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;padding:8px;background:linear-gradient(90deg,rgba(121,196,210,.08),rgba(212,137,58,.08));border-radius:12px;border:1px solid var(--line)}
    .stat{padding:22px 10px;text-align:center}
    .stat b{display:block;font-size:36px;color:var(--amber-2);font-family:var(--mono);line-height:1.1}
    .stat span{color:var(--muted);font-size:13px}
    .reviews{background:#0a1016}
    .masonry{columns:3;column-gap:14px}
    .review{break-inside:avoid;margin-bottom:14px;padding:16px 18px}
    .stars{color:var(--amber-2);letter-spacing:2px;font-size:12px;margin-bottom:8px}
    .type-bar{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:22px}
    .type-bar span{min-height:44px;display:inline-flex;align-items:center;padding:0 14px;border:1px dashed var(--line-2);border-radius:8px;color:var(--steel-2);font-size:13px}
    .compare{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}
    .before{opacity:.85}.after{border-color:rgba(212,137,58,.45)}
    .news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .news-card{padding:0;overflow:hidden}
    .news-card img{height:150px;width:100%;object-fit:cover}
    .news-card .body{padding:16px 18px 18px}
    .date{font-family:var(--mono);font-size:12px;color:var(--muted)}
    .faq-list{display:grid;gap:10px}
    .faq-item{overflow:hidden}
    .faq-item button{width:100%;text-align:left;background:transparent;border:0;color:var(--text);min-height:56px;padding:14px 18px;display:flex;justify-content:space-between;gap:12px;font-size:16px;font-weight:650}
    .faq-item .ans{display:none;padding:0 18px 16px;color:var(--text-2)}
    .faq-item.open .ans{display:block}
    .faq-item .ico{color:var(--amber-2)}
    .cta{background:radial-gradient(600px 200px at 80% 20%,rgba(212,137,58,.18),transparent 60%),linear-gradient(180deg,#0b1218,#080c11)}
    .cta-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:24px}
    .form{padding:24px;display:grid;grid-template-columns:1fr 1fr;gap:12px}
    .field{display:flex;flex-direction:column;gap:6px}
    .field label{font-size:13px;color:var(--muted)}
    .field.full{grid-column:1/-1}
    .form-msg{grid-column:1/-1;display:none;color:#9be7b0}
    .trust{padding:24px}
    .trust li{margin-bottom:12px;color:var(--text-2)}
    .trust b{color:var(--text);display:block}
    .site-footer{background:#05080c;border-top:1px solid var(--line);padding:48px 0 20px;color:var(--muted)}
    .footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:28px;margin-bottom:28px}
    .site-footer a{color:var(--text-2);display:inline-block;min-height:32px}
    .copy{border-top:1px solid var(--line);padding-top:16px;font-size:13px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
    .float-bar{position:fixed;left:16px;right:16px;bottom:16px;z-index:70;display:none;align-items:center;justify-content:space-between;gap:12px;padding:10px 12px}
    @media (max-width:1440px){.container{width:min(100% - 36px,1200px)}}
    @media (max-width:1024px){.nav-links{display:none}.menu-toggle{display:grid;place-items:center}.intro-grid,.group-panel.active,.case-wrap,.story-grid,.story-main,.cta-grid{grid-template-columns:1fr}.product-grid,.compare,.news-grid{grid-template-columns:1fr 1fr}.span-7,.span-5,.span-4{grid-column:span 6}.span-12{grid-column:span 12}.masonry{columns:2}.stats{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}.hero-copy{padding:56px 0 96px}.demo-view img,.intro-photo img{height:320px;min-height:320px}.float-bar{display:flex}}
    @media (max-width:768px){.section{padding:72px 0}.topbar-right{display:none}.product-grid,.compare,.news-grid,.bento{grid-template-columns:1fr}.span-7,.span-5,.span-4,.span-12{grid-column:span 1}.masonry{columns:1}.form{grid-template-columns:1fr}.stats{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.hero{min-height:78vh}.callout{position:static;margin-top:10px;max-width:none}}
    @media (max-width:520px){.container{width:min(100% - 24px,var(--container))}.hero-actions{width:100%}.mini-form{grid-template-columns:1fr}.float-bar{flex-direction:column;align-items:stretch}}