/* roulang page: index */
:root {
      --bg: #050914;
      --bg-2: #07111f;
      --bg-3: #0a1830;
      --primary: #1C4FBF;
      --cyan: #3CE7F2;
      --cyan-2: #7af3fb;
      --warm: #E8B15A;
      --success: #3DDC97;
      --text: #e8eef8;
      --text-dim: #9bb0c9;
      --text-mute: #7b8fa8;
      --glass: rgba(10, 24, 48, .55);
      --glass-2: rgba(12, 28, 56, .72);
      --line: rgba(120, 196, 255, .22);
      --line-strong: rgba(60, 231, 242, .45);
      --danger: #ff6b7a;
      --radius: 20px;
      --radius-sm: 14px;
      --shadow: 0 18px 40px rgba(0, 0, 0, .35);
      --glow: 0 0 18px rgba(60, 231, 242, .35), 0 0 42px rgba(28, 79, 191, .28);
      --container: 1200px;
      --space-d: 104px;
      --space-m: 56px;
      --nav-h: 72px;
      --top-h: 44px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    html, body { max-width: 100%; overflow-x: hidden; }
    body {
      margin: 0;
      background: var(--bg);
      color: var(--text);
      font-family: "Noto Sans SC", "Source Han Sans", sans-serif;
      font-size: 16px;
      line-height: 1.75;
      min-height: 100%;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; }
    button, input, select, textarea { font-family: inherit; color: inherit; }
    button { cursor: pointer; }
    :focus-visible {
      outline: 2px solid var(--cyan);
      outline-offset: 3px;
    }
    .num { font-variant-numeric: tabular-nums; font-feature-settings: "tnum"; }
    .container {
      width: min(100% - 32px, var(--container));
      margin: 0 auto;
    }
    .site-header { position: relative; z-index: 80; }
    .nav-top {
      min-height: var(--top-h);
      background: linear-gradient(90deg, rgba(232, 177, 90, .14), rgba(60, 231, 242, .08) 42%, rgba(28, 79, 191, .16));
      border-bottom: 1px solid var(--line);
      color: var(--text-dim);
      font-size: 13px;
    }
    .nav-top-inner {
      min-height: var(--top-h);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }
    .nav-top a, .nav-top span { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; }
    .nav-top .warm { color: var(--warm); }
    .trust-chip {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      min-height: 32px;
      padding: 0 10px;
      border-radius: 999px;
      border: 1px solid rgba(61, 220, 151, .35);
      color: var(--success);
      background: rgba(61, 220, 151, .08);
      white-space: nowrap;
    }
    .nav-main {
      min-height: var(--nav-h);
      background: rgba(5, 9, 20, .72);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid transparent;
      transition: background .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .nav-main.is-fixed {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      background: rgba(7, 14, 28, .86);
      border-bottom-color: var(--line);
      box-shadow: 0 10px 30px rgba(0, 0, 0, .28);
    }
    .nav-main-inner {
      min-height: var(--nav-h);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      min-height: 44px;
      font-weight: 700;
      letter-spacing: .02em;
      white-space: nowrap;
    }
    .logo-mark {
      width: 36px;
      height: 36px;
      border-radius: 12px;
      background: radial-gradient(circle at 30% 30%, var(--cyan), var(--primary) 62%, #071018);
      box-shadow: var(--glow);
      position: relative;
      flex: 0 0 36px;
    }
    .logo-mark::after {
      content: "";
      position: absolute;
      inset: 10px 8px 8px;
      border: 2px solid rgba(5, 9, 20, .75);
      border-radius: 8px 8px 10px 10px;
    }
    .menu {
      display: flex;
      align-items: center;
      gap: 6px;
      flex-wrap: wrap;
    }
    .menu a {
      min-height: 44px;
      padding: 0 12px;
      display: inline-flex;
      align-items: center;
      color: var(--text-dim);
      font-size: 14px;
      border-radius: 12px;
      transition: color .2s ease, background .2s ease, box-shadow .2s ease;
    }
    .menu a:hover, .menu a:focus-visible, .menu a.is-active {
      color: var(--cyan);
      background: rgba(60, 231, 242, .08);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 44px;
      padding: 0 18px;
      border-radius: 999px;
      border: 1px solid transparent;
      font-weight: 600;
      font-size: 14px;
      transition: transform .18s ease, box-shadow .18s ease, filter .18s ease, background .18s ease, border-color .18s ease;
    }
    .btn:active { transform: translateY(1px) scale(.98); }
    .btn-glow {
      background: var(--cyan);
      color: #041018;
      box-shadow: var(--glow);
    }
    .btn-glow:hover, .btn-glow:focus-visible {
      filter: brightness(1.08);
      box-shadow: 0 0 22px rgba(60, 231, 242, .55), 0 0 54px rgba(28, 79, 191, .4);
    }
    .btn-ghost {
      background: rgba(10, 24, 48, .4);
      border-color: var(--line);
      color: var(--text);
      backdrop-filter: blur(16px);
    }
    .btn-ghost:hover, .btn-ghost:focus-visible {
      border-color: var(--line-strong);
      box-shadow: 0 0 18px rgba(60, 231, 242, .18);
      color: var(--cyan);
    }
    .menu-toggle {
      display: none;
      width: 44px;
      height: 44px;
      border: 1px solid var(--line);
      border-radius: 12px;
      background: var(--glass);
      color: var(--cyan);
    }
    .drawer {
      position: fixed;
      inset: 0;
      background: rgba(5, 9, 20, .96);
      z-index: 90;
      transform: translateX(100%);
      transition: transform .28s ease;
      padding: 24px 20px 40px;
      overflow: auto;
    }
    .drawer.open { transform: translateX(0); }
    .drawer a {
      display: flex;
      align-items: center;
      min-height: 48px;
      border-bottom: 1px solid var(--line);
      color: var(--text);
      font-size: 16px;
    }
    .hero {
      position: relative;
      height: 90vh;
      min-height: 620px;
      overflow: hidden;
    }
    .hero-track, .hero-slide { height: 100%; }
    .hero-track { position: relative; }
    .hero-slide {
      position: absolute;
      inset: 0;
      opacity: 0;
      pointer-events: none;
      transition: opacity .6s ease;
    }
    .hero-slide.is-on { opacity: 1; pointer-events: auto; }
    .hero-slide img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .hero-slide::after {
      content: "";
      position: absolute;
      inset: 0;
      background:
        linear-gradient(90deg, rgba(5, 9, 20, .9) 0%, rgba(5, 9, 20, .62) 46%, rgba(5, 9, 20, .28) 100%),
        linear-gradient(180deg, rgba(5, 9, 20, .2) 0%, rgba(5, 9, 20, .55) 100%);
    }
    .hero-copy {
      position: absolute;
      left: 0;
      right: 0;
      top: 50%;
      transform: translateY(-48%);
      z-index: 2;
    }
    .hero-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      min-height: 32px;
      padding: 0 12px;
      border-radius: 999px;
      border: 1px solid var(--line);
      background: var(--glass);
      color: var(--cyan);
      font-size: 13px;
      margin-bottom: 16px;
    }
    .hero h1, .hero h2.slide-title {
      margin: 0 0 16px;
      font-size: clamp(28px, 4.4vw, 54px);
      line-height: 1.2;
      font-weight: 700;
      max-width: 16ch;
    }
    .hero p.lead {
      max-width: 42em;
      color: var(--text-dim);
      font-size: 16px;
      margin: 0 0 28px;
    }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero-ctrl {
      position: absolute;
      z-index: 3;
      left: 0;
      right: 0;
      bottom: 28px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .dot, .ctrl-btn {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      border: 1px solid var(--line);
      background: var(--glass);
      color: var(--text);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .dot { width: 14px; height: 14px; min-width: 14px; }
    .dot.is-on { background: var(--cyan); box-shadow: 0 0 12px var(--cyan); }
    .hud-grid {
      pointer-events: none;
      background-image:
        linear-gradient(rgba(60, 231, 242, .045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(60, 231, 242, .045) 1px, transparent 1px);
      background-size: 42px 42px;
    }
    .radar::before {
      content: "";
      position: absolute;
      width: 420px;
      height: 420px;
      right: -80px;
      top: -80px;
      border: 1px solid rgba(60, 231, 242, .12);
      border-radius: 50%;
      box-shadow: 0 0 0 48px rgba(60, 231, 242, .04), 0 0 0 96px rgba(28, 79, 191, .05);
      pointer-events: none;
    }
    main section { position: relative; }
    .sec {
      padding: var(--space-d) 0;
    }
    .sec-head { max-width: 760px; margin-bottom: 36px; }
    .sec-head h2 {
      margin: 0 0 12px;
      font-size: clamp(24px, 3vw, 34px);
      line-height: 1.3;
    }
    .sec-head p { margin: 0; color: var(--text-dim); font-size: 16px; }
    .glass-card {
      background: var(--glass);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      backdrop-filter: blur(16px);
      box-shadow: var(--shadow);
      transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
    }
    .glass-card:hover {
      transform: translateY(-5px);
      border-color: var(--line-strong);
      box-shadow: 0 16px 36px rgba(0, 0, 0, .32), 0 0 24px rgba(60, 231, 242, .18);
    }
    .metric-board {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }
    .metric {
      padding: 24px 22px 22px;
      position: relative;
      overflow: hidden;
    }
    .metric .label { color: var(--text-mute); font-size: 13px; }
    .metric .value {
      font-size: clamp(32px, 3.4vw, 44px);
      line-height: 1.15;
      margin: 10px 0 8px;
      color: #fff;
    }
    .metric .value em { font-style: normal; color: var(--warm); font-size: .48em; margin-left: 4px; }
    .metric .note { color: var(--text-dim); font-size: 13px; margin: 0; }
    .split {
      display: grid;
      grid-template-columns: 1.05fr .95fr;
      gap: 36px;
      align-items: center;
    }
    .shot {
      border-radius: 22px;
      overflow: hidden;
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }
    .shot img { width: 100%; height: 100%; object-fit: cover; min-height: 360px; }
    .spec-list { margin: 18px 0 0; padding: 0; list-style: none; }
    .spec-list li {
      display: flex;
      gap: 10px;
      padding: 10px 0;
      border-bottom: 1px solid rgba(120, 196, 255, .12);
      color: var(--text-dim);
      font-size: 15px;
    }
    .spec-list i { color: var(--cyan); width: 18px; margin-top: 4px; }
    .matrix {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }
    .matrix article { padding: 24px; min-height: 100%; }
    .ico {
      width: 44px;
      height: 44px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: var(--cyan);
      border: 1px solid var(--line);
      background: rgba(60, 231, 242, .08);
      margin-bottom: 14px;
    }
    .matrix h3 { margin: 0 0 10px; font-size: 20px; }
    .matrix ul { margin: 0 0 16px; padding-left: 18px; color: var(--text-dim); font-size: 14px; }
    .matrix ul li { margin: 6px 0; }
    .tiny-link {
      color: var(--cyan);
      font-size: 14px;
      min-height: 44px;
      display: inline-flex;
      align-items: center;
    }
    .tiny-link:hover { color: var(--cyan-2); }
    .product-stage {
      display: grid;
      grid-template-columns: 1.35fr .8fr;
      gap: 16px;
    }
    .product-side { display: grid; gap: 16px; }
    .product {
      overflow: hidden;
      display: grid;
    }
    .product img { width: 100%; height: 230px; object-fit: cover; }
    .product.main img { height: 320px; }
    .product .body { padding: 20px 22px 22px; }
    .product h3 { margin: 0 0 8px; font-size: 22px; }
    .params { display: grid; gap: 8px; margin: 14px 0 16px; }
    .params span {
      display: flex;
      justify-content: space-between;
      gap: 12px;
      font-size: 13px;
      color: var(--text-dim);
      border-bottom: 1px dashed rgba(120, 196, 255, .16);
      padding-bottom: 6px;
    }
    .params b { color: var(--text); font-weight: 600; }
    .compare-wrap { overflow-x: auto; }
    .compare {
      width: 100%;
      min-width: 640px;
      border-collapse: collapse;
      overflow: hidden;
      border-radius: 18px;
    }
    .compare th, .compare td {
      padding: 16px 18px;
      text-align: left;
      font-size: 15px;
      border-bottom: 1px solid rgba(120, 196, 255, .12);
    }
    .compare thead th { background: rgba(12, 28, 56, .9); }
    .compare tbody tr:nth-child(odd) { background: rgba(10, 24, 48, .35); }
    .compare tbody tr:nth-child(even) { background: rgba(10, 24, 48, .55); }
    .compare td:last-child, .compare th:last-child {
      background: rgba(60, 231, 242, .08);
      color: var(--cyan);
      font-weight: 600;
    }
    .idea {
      padding: 0;
    }
    .idea-band {
      min-height: 560px;
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
    }
    .idea-band::before {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(5,9,20,.92), rgba(5,9,20,.66) 50%, rgba(5,9,20,.42));
    }
    .quote {
      position: relative;
      z-index: 1;
      font-size: clamp(26px, 3.2vw, 40px);
      line-height: 1.35;
      max-width: 16em;
      margin: 0 0 28px;
    }
    .slices { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; position: relative; z-index: 1; }
    .slices article {
      padding: 18px;
      border-radius: 16px;
      background: rgba(10, 24, 48, .55);
      border: 1px solid var(--line);
      backdrop-filter: blur(16px);
    }
    .slices h3 { margin: 0 0 8px; font-size: 18px; }
    .slices p { margin: 0; color: var(--text-dim); font-size: 14px; }
    .timeline {
      display: grid;
      grid-template-columns: repeat(7, 1fr);
      gap: 10px;
      position: relative;
    }
    .timeline::before {
      content: "";
      position: absolute;
      left: 8px;
      right: 8px;
      top: 22px;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--cyan), transparent);
    }
    .node {
      background: transparent;
      border: 0;
      text-align: left;
      padding: 0;
      color: inherit;
      min-height: 44px;
    }
    .node i {
      width: 16px;
      height: 16px;
      border-radius: 50%;
      display: block;
      background: var(--bg);
      border: 2px solid var(--cyan);
      box-shadow: 0 0 12px var(--cyan);
      margin-bottom: 14px;
      position: relative;
      z-index: 1;
    }
    .node strong { display: block; font-size: 14px; margin-bottom: 6px; }
    .node p { margin: 0; color: var(--text-dim); font-size: 13px; }
    .node.is-on i { background: var(--cyan); }
    .stories { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .stories article img { width: 100%; height: 180px; object-fit: cover; }
    .stories .body { padding: 18px 20px 20px; }
    .stories h3 { margin: 0 0 8px; font-size: 18px; }
    .chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
    .chip {
      min-height: 44px;
      padding: 0 16px;
      border-radius: 999px;
      border: 1px solid var(--line);
      background: var(--glass);
      color: var(--text-dim);
    }
    .chip.is-on, .chip:hover {
      color: #041018;
      background: var(--cyan);
      border-color: var(--cyan);
      box-shadow: var(--glow);
    }
    .scene-panel {
      display: none;
      grid-template-columns: .9fr 1.1fr;
      gap: 24px;
      align-items: center;
    }
    .scene-panel.is-on { display: grid; }
    .scene-panel img { width: 100%; height: 320px; object-fit: cover; border-radius: 18px; }
    .review-track {
      display: flex;
      gap: 16px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 8px;
    }
    .review {
      min-width: min(86vw, 320px);
      scroll-snap-align: start;
      padding: 22px;
    }
    .stars { color: var(--warm); letter-spacing: 2px; margin-bottom: 10px; }
    .review p { margin: 0 0 14px; color: var(--text-dim); font-size: 15px; }
    .review .who { font-size: 13px; color: var(--text-mute); }
    .news-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .news {
      display: grid;
      grid-template-columns: 140px 1fr;
      gap: 16px;
      padding: 14px;
      align-items: center;
    }
    .news img { width: 140px; height: 100px; object-fit: cover; border-radius: 14px; }
    .news time { color: var(--warm); font-size: 12px; }
    .news h3 { margin: 4px 0 6px; font-size: 18px; }
    .news p { margin: 0; color: var(--text-dim); font-size: 14px; }
    .guards { display: grid; gap: 12px; }
    .guard {
      display: grid;
      grid-template-columns: 52px 1fr;
      gap: 14px;
      align-items: center;
      padding: 18px 20px;
    }
    .quick {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }
    .quick article { padding: 18px 20px; }
    .quick h3 { margin: 0 0 8px; font-size: 17px; }
    .quick p { margin: 0; color: var(--text-dim); font-size: 14px; }
    .faq-item {
      border: 1px solid var(--line);
      border-radius: 16px;
      background: var(--glass);
      margin-bottom: 10px;
      overflow: hidden;
    }
    .faq-item button {
      width: 100%;
      min-height: 56px;
      text-align: left;
      padding: 14px 18px;
      background: transparent;
      border: 0;
      display: flex;
      justify-content: space-between;
      gap: 12px;
      align-items: center;
      font-size: 16px;
    }
    .faq-item button i { color: var(--cyan); transition: transform .2s ease; }
    .faq-item.open button i { transform: rotate(180deg); }
    .faq-item .ans {
      display: none;
      padding: 0 18px 18px;
      color: var(--text-dim);
      font-size: 15px;
    }
    .faq-item.open .ans { display: block; }
    .lead {
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 24px;
      align-items: stretch;
    }
    .lead-copy, .lead-form { padding: 28px; }
    .trust3 { margin: 18px 0 0; padding: 0; list-style: none; }
    .trust3 li { display: flex; gap: 8px; color: var(--text-dim); margin: 8px 0; }
    .trust3 i { color: var(--success); margin-top: 4px; }
    form .row { margin-bottom: 14px; }
    label { display: block; font-size: 13px; color: var(--text-mute); margin-bottom: 6px; }
    input, select, textarea {
      width: 100%;
      min-height: 44px;
      border-radius: 12px;
      border: 1px solid var(--line);
      background: rgba(5, 9, 20, .55);
      padding: 10px 12px;
      transition: border-color .2s ease, box-shadow .2s ease;
    }
    textarea { min-height: 96px; resize: vertical; }
    input:focus, select:focus, textarea:focus {
      border-color: var(--cyan);
      box-shadow: 0 0 0 3px rgba(60, 231, 242, .18);
      outline: none;
    }
    .is-error { border-color: var(--danger) !important; }
    .err { display: none; color: var(--danger); font-size: 12px; margin-top: 4px; }
    .ok {
      display: none;
      margin-top: 12px;
      padding: 12px 14px;
      border-radius: 12px;
      background: rgba(61, 220, 151, .12);
      color: var(--success);
      border: 1px solid rgba(61, 220, 151, .35);
    }
    .site-footer {
      border-top: 1px solid var(--line);
      padding: 56px 0 28px;
      background: #060c18;
    }
    .foot-grid {
      display: grid;
      grid-template-columns: 1.3fr 1fr 1fr 1.1fr;
      gap: 28px;
      margin-bottom: 28px;
    }
    .site-footer h3 { margin: 0 0 12px; font-size: 16px; }
    .site-footer p, .site-footer a, .site-footer li { color: var(--text-dim); font-size: 14px; }
    .site-footer ul { margin: 0; padding: 0; list-style: none; }
    .site-footer li { margin: 8px 0; }
    .site-footer a { display: inline-flex; min-height: 32px; align-items: center; }
    .site-footer a:hover { color: var(--cyan); }
    .copy {
      border-top: 1px solid rgba(120, 196, 255, .12);
      padding-top: 16px;
      color: var(--text-mute);
      font-size: 13px;
      display: flex;
      justify-content: space-between;
      gap: 12px;
      flex-wrap: wrap;
    }
    @media (max-width: 1440px) {
      :root { --container: 1120px; --space-d: 96px; }
    }
    @media (max-width: 1024px) {
      :root { --space-d: 80px; }
      .menu { display: none; }
      .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
      .metric-board, .matrix { grid-template-columns: repeat(2, 1fr); }
      .split, .product-stage, .lead, .scene-panel.is-on, .news { grid-template-columns: 1fr; }
      .product img, .product.main img, .shot img, .scene-panel img { min-height: 240px; height: 260px; }
      .timeline { grid-template-columns: 1fr; }
      .timeline::before { display: none; }
      .stories { grid-template-columns: 1fr; }
      .slices { grid-template-columns: 1fr; }
      .foot-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      :root { --space-d: 56px; --space-m: 48px; }
      .nav-top-inner { flex-wrap: wrap; justify-content: flex-start; }
      .hero { height: 78vh; min-height: 540px; }
      .hero h1, .hero h2.slide-title { max-width: none; }
      .metric-board, .quick, .news-list, .foot-grid { grid-template-columns: 1fr; }
      .news { grid-template-columns: 1fr; }
      .news img { width: 100%; height: 180px; }
      .hero-ctrl { bottom: 16px; }
    }
    @media (max-width: 375px) {
      .container { width: min(100% - 24px, var(--container)); }
      .hero { min-height: 520px; }
      .btn { width: 100%; }
      .hero-actions { width: 100%; }
    }