/* roulang page: index */
:root {
      --night: #071525;
      --tech: #0E2A4A;
      --ice: #3EC6FF;
      --ice-dim: rgba(62, 198, 255, .28);
      --carbon: #161C26;
      --mist: #C9D4E3;
      --amber: #E8A23A;
      --bg: #050A12;
      --ink: #E8F1FA;
      --muted: #9BB0C6;
      --line: rgba(62, 198, 255, .28);
      --glass: rgba(14, 42, 74, .42);
      --glass-lite: rgba(255, 255, 255, .07);
      --radius: 16px;
      --radius-sm: 12px;
      --radius-pill: 999px;
      --shadow: 0 10px 30px rgba(3, 10, 22, .35);
      --glow: 0 0 0 1px rgba(62, 198, 255, .28), 0 8px 28px rgba(62, 198, 255, .18);
      --space: 28px;
      --header-offset: 122px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    html, body { margin: 0; padding: 0; }
    body {
      font-family: "Noto Sans SC", "Source Han Sans", system-ui, sans-serif;
      background:
        radial-gradient(900px 420px at 12% -10%, rgba(62, 198, 255, .14), transparent 55%),
        radial-gradient(700px 380px at 90% 8%, rgba(14, 42, 74, .9), transparent 50%),
        var(--bg);
      color: var(--ink);
      line-height: 1.75;
      font-size: 16px;
      overflow-x: hidden;
    }
    body.menu-lock { overflow: hidden; }
    img { max-width: 100%; height: auto; display: block; }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font-family: inherit; }
    button { cursor: pointer; }
    :focus-visible {
      outline: 2px solid var(--ice);
      outline-offset: 3px;
    }
    .container { width: min(1240px, calc(100% - 32px)); margin: 0 auto; }
    .tabular { font-variant-numeric: tabular-nums; }
    .site-header { position: relative; z-index: 80; }
    .topbar {
      background: #02060C;
      border-bottom: 1px solid rgba(62, 198, 255, .12);
      font-size: 13px;
      color: var(--muted);
    }
    .topbar-inner {
      min-height: 42px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }
    .topbar a:hover { color: var(--ice); }
    .trust-pills { display: flex; gap: 8px; flex-wrap: wrap; }
    .pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      border: 1px solid var(--line);
      border-radius: var(--radius-pill);
      padding: 4px 10px;
      color: var(--mist);
      background: rgba(14, 42, 74, .5);
      font-size: 12px;
    }
    .mainbar {
      position: sticky;
      top: 0;
      z-index: 90;
      backdrop-filter: blur(16px) saturate(140%);
      background: rgba(7, 21, 37, .55);
      border-bottom: 1px solid transparent;
      transition: background .25s ease, border-color .25s ease, box-shadow .25s ease;
    }
    .mainbar.is-scrolled {
      background: rgba(5, 10, 18, .92);
      border-bottom-color: rgba(62, 198, 255, .22);
      box-shadow: 0 10px 30px rgba(0, 0, 0, .28);
    }
    .mainbar-inner {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      min-height: 44px;
      font-weight: 800;
      letter-spacing: .04em;
      color: #fff;
      white-space: nowrap;
    }
    .logo-mark {
      width: 36px; height: 36px; border-radius: 10px;
      background: linear-gradient(160deg, #3EC6FF, #0E2A4A);
      box-shadow: 0 0 18px rgba(62, 198, 255, .45);
      position: relative;
    }
    .logo-mark::after {
      content: "";
      position: absolute; inset: 9px 7px 9px 16px;
      border-right: 2px solid #071525;
      border-bottom: 2px solid #071525;
      transform: skewX(-18deg);
    }
    .nav-desk { display: flex; align-items: center; gap: 6px; }
    .nav-desk a {
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      padding: 0 12px;
      color: var(--mist);
      font-size: 14px;
      border-radius: 10px;
      transition: color .2s, background .2s;
    }
    .nav-desk a:hover, .nav-desk a.active { color: #fff; background: rgba(62, 198, 255, .1); }
    .btn {
      display: inline-flex; align-items: center; justify-content: center;
      min-height: 44px; padding: 0 20px; border-radius: var(--radius-pill);
      font-weight: 700; font-size: 14px; border: 1px solid transparent;
      transition: transform .15s ease, box-shadow .2s ease, background .2s ease, filter .2s ease;
    }
    .btn-glow {
      background: #3EC6FF; color: #041018;
      box-shadow: 0 0 0 1px rgba(62, 198, 255, .35), 0 8px 24px rgba(62, 198, 255, .35);
    }
    .btn-glow:hover { filter: brightness(1.08); box-shadow: 0 0 0 1px rgba(62, 198, 255, .5), 0 10px 32px rgba(62, 198, 255, .55); }
    .btn-glow:active { transform: translateY(1px) scale(.98); }
    .btn-ghost {
      background: rgba(255, 255, 255, .06);
      color: #d7f6ff;
      border-color: rgba(62, 198, 255, .4);
      text-shadow: 0 0 12px rgba(62, 198, 255, .45);
    }
    .btn-ghost:hover { background: rgba(62, 198, 255, .12); }
    .btn-ghost:active { transform: translateY(1px); }
    .burger {
      display: none; width: 44px; height: 44px; border-radius: 12px;
      background: rgba(255,255,255,.06); border: 1px solid var(--line); color: #fff;
    }
    .drawer {
      position: fixed; inset: 0; z-index: 100; display: none;
      background: rgba(2, 6, 12, .72);
    }
    .drawer.open { display: block; }
    .drawer-panel {
      margin-left: auto; width: min(420px, 100%); height: 100%;
      background: rgba(7, 21, 37, .92);
      backdrop-filter: blur(18px) saturate(140%);
      border-left: 1px solid var(--line);
      padding: 24px;
      overflow: auto;
    }
    .drawer a {
      display: flex; align-items: center; min-height: 48px;
      border-bottom: 1px solid rgba(255,255,255,.06); color: var(--mist);
    }
    main { display: block; }
    .section {
      padding: 108px 0;
      position: relative;
    }
    .section-tight { padding: 72px 0; }
    .kicker {
      display: inline-flex; align-items: center; gap: 8px;
      color: var(--ice); font-size: 13px; letter-spacing: .12em;
      text-transform: uppercase; margin-bottom: 10px;
    }
    h1, h2, h3 { line-height: 1.25; color: #fff; margin: 0 0 14px; }
    h1 { font-size: clamp(32px, 5vw, 54px); font-weight: 900; }
    h2 { font-size: clamp(26px, 3.4vw, 34px); font-weight: 800; }
    h3 { font-size: clamp(18px, 2vw, 22px); font-weight: 700; }
    .lead { color: var(--mist); max-width: 760px; }
    .glass {
      background: linear-gradient(180deg, var(--glass), var(--glass-lite));
      backdrop-filter: blur(16px) saturate(140%);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: inset 0 1px 0 rgba(255,255,255,.08), var(--shadow);
    }
    .glass-hover { transition: transform .22s ease, box-shadow .22s ease; }
    .glass-hover:hover {
      transform: translateY(-6px);
      box-shadow: 0 0 0 1px rgba(62,198,255,.4), 0 16px 40px rgba(62,198,255,.18);
    }
    .hero {
      position: relative; min-height: 86vh; display: flex; align-items: stretch;
      padding: 0; overflow: hidden;
    }
    .hero-slide {
      position: absolute; inset: 0; opacity: 0; pointer-events: none;
      transition: opacity .6s ease;
    }
    .hero-slide.active { opacity: 1; pointer-events: auto; }
    .hero-slide img {
      width: 100%; height: 100%; object-fit: cover; filter: saturate(1.05) contrast(1.05);
    }
    .hero-mask {
      position: absolute; inset: 0;
      background:
        linear-gradient(90deg, rgba(5,10,18,.88) 0%, rgba(5,10,18,.62) 46%, rgba(5,10,18,.28) 100%),
        linear-gradient(180deg, rgba(5,10,18,.2), rgba(5,10,18,.72));
    }
    .hero-copy {
      position: relative; z-index: 2; width: 100%;
      display: flex; align-items: center; padding: 48px 0 72px;
    }
    .hero-grid {
      display: grid; grid-template-columns: 1.15fr .85fr; gap: 32px; align-items: center;
    }
    .console {
      background: rgba(2, 6, 12, .72);
      border: 1px solid var(--line);
      border-radius: 18px;
      box-shadow: var(--glow);
      overflow: hidden;
    }
    .console-bar {
      display: flex; align-items: center; justify-content: space-between;
      padding: 10px 14px; background: rgba(14,42,74,.7); color: var(--muted); font-size: 12px;
    }
    .dots { display: flex; gap: 6px; }
    .dots i { width: 8px; height: 8px; border-radius: 50%; display: block; }
    .console pre {
      margin: 0; padding: 18px 18px 8px; color: #b9e9ff; font-size: 13px; line-height: 1.7;
      overflow: auto; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    }
    .console .cta-row { padding: 0 16px 16px; display: flex; gap: 10px; flex-wrap: wrap; }
    .hero-ctrl {
      position: absolute; z-index: 3; bottom: 22px; left: 50%; transform: translateX(-50%);
      display: flex; align-items: center; gap: 10px;
    }
    .hero-btn, .hero-dot {
      width: 44px; height: 44px; border-radius: 50%;
      border: 1px solid var(--line); background: rgba(7,21,37,.6); color: #fff;
    }
    .hero-dot { width: 12px; height: 12px; padding: 0; }
    .hero-dot.active { background: var(--ice); box-shadow: 0 0 12px var(--ice); }
    .metric-grid {
      display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px;
    }
    .metric-card { padding: 22px 18px; }
    .metric-card strong {
      display: block; font-size: 34px; color: var(--ice); line-height: 1.1; margin-bottom: 8px;
    }
    .split {
      display: grid; grid-template-columns: .92fr 1.08fr; gap: 40px; align-items: center;
    }
    .split.reverse { grid-template-columns: 1.08fr .92fr; }
    .media {
      border-radius: 18px; overflow: hidden; border: 1px solid var(--line);
      aspect-ratio: 16/10;
    }
    .media img { width: 100%; height: 100%; object-fit: cover; }
    .spec-list { margin: 16px 0 22px; padding: 0; list-style: none; }
    .spec-list li {
      display: flex; gap: 10px; padding: 8px 0; color: var(--mist);
      border-bottom: 1px solid rgba(255,255,255,.05);
    }
    .service-grid {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
    }
    .icon-line {
      width: 42px; height: 42px; border-radius: 12px;
      display: grid; place-items: center; margin-bottom: 14px;
      border: 1px solid var(--line); color: var(--ice);
      box-shadow: 0 0 16px rgba(62,198,255,.15);
    }
    .hot-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .hot-card .cover { aspect-ratio: 16/10; overflow: hidden; }
    .hot-card .cover img { width: 100%; height: 100%; object-fit: cover; }
    .hot-card .body { padding: 20px; }
    .hot-card ul { margin: 10px 0 16px; padding-left: 18px; color: var(--muted); }
    .compare-wrap { overflow: auto; }
    table.compare {
      width: 100%; border-collapse: collapse; min-width: 720px;
    }
    table.compare th, table.compare td {
      padding: 14px 16px; text-align: left; border-bottom: 1px solid rgba(62,198,255,.12);
    }
    table.compare th { color: #fff; background: rgba(14,42,74,.5); }
    table.compare td { color: var(--mist); }
    .win { color: #ffd89a; }
    .badge-amber {
      display: inline-flex; align-items: center; border-radius: 999px;
      background: rgba(232,162,58,.12); color: var(--amber);
      border: 1px solid rgba(232,162,58,.4); padding: 2px 8px; font-size: 12px;
    }
    .dark-band {
      background: linear-gradient(180deg, #02060C, #0A1E36);
      padding: 108px 0;
      position: relative;
    }
    .dark-band .bg {
      position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .28;
    }
    .case-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 28px; position: relative; z-index: 1; }
    .slices { display: grid; gap: 14px; }
    .timeline {
      display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; position: relative;
    }
    .timeline::before {
      content: ""; position: absolute; left: 0; right: 0; top: 28px; height: 1px;
      background: linear-gradient(90deg, transparent, var(--ice), transparent);
    }
    .node { padding-top: 8px; }
    .node b { display: inline-block; width: 14px; height: 14px; border-radius: 50%; background: var(--ice); box-shadow: 0 0 12px var(--ice); margin-bottom: 16px; position: relative; z-index: 1; }
    .scene-track {
      display: grid; grid-template-columns: 1.3fr 1fr 1fr; grid-template-rows: auto auto; gap: 16px;
    }
    .scene-card { overflow: hidden; }
    .scene-card img { width: 100%; height: 180px; object-fit: cover; }
    .scene-card.wide { grid-row: span 2; }
    .scene-card.wide img { height: 100%; min-height: 360px; }
    .scene-card .pad { padding: 18px; }
    .story-grid { display: grid; grid-template-columns: 1.4fr .8fr; gap: 18px; }
    .side-stories { display: grid; gap: 16px; }
    .quote { font-size: 18px; color: #fff; }
    .review-track {
      display: grid; grid-auto-flow: column; grid-auto-columns: minmax(280px, 1fr);
      gap: 14px; overflow-x: auto; padding-bottom: 8px; scroll-snap-type: x mandatory;
    }
    .review-card { scroll-snap-align: start; padding: 18px; min-height: 220px; }
    .stars { color: var(--amber); letter-spacing: 2px; }
    .news-list { display: grid; gap: 14px; }
    .news-item {
      display: grid; grid-template-columns: 220px 1fr auto; gap: 16px; align-items: center; padding: 12px;
    }
    .news-item img { width: 220px; height: 132px; object-fit: cover; border-radius: 12px; }
    .guard-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .chip-list { display: grid; gap: 10px; }
    .chip-q {
      width: 100%; text-align: left; color: #fff; padding: 12px 16px; min-height: 48px;
      border-radius: 999px; border: 1px solid var(--line); background: rgba(14,42,74,.35);
    }
    .chip-a { display: none; padding: 8px 18px 4px; color: var(--mist); }
    .chip-item.open .chip-a { display: block; }
    .faq-item { margin-bottom: 10px; overflow: hidden; }
    .faq-btn {
      width: 100%; display: flex; justify-content: space-between; gap: 12px;
      text-align: left; background: transparent; color: #fff; border: 0; padding: 18px 20px; min-height: 56px;
    }
    .faq-ico { transition: transform .2s; color: var(--ice); }
    .faq-item.open .faq-ico { transform: rotate(45deg); }
    .faq-panel { display: none; padding: 0 20px 18px; color: var(--mist); }
    .faq-item.open .faq-panel { display: block; }
    .form-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 24px; }
    label { display: block; margin-bottom: 12px; color: var(--mist); font-size: 14px; }
    input, select, textarea {
      width: 100%; margin-top: 6px; min-height: 46px; border-radius: 12px;
      border: 1px solid rgba(62,198,255,.25); background: rgba(2,6,12,.55); color: #fff; padding: 10px 12px;
    }
    textarea { min-height: 96px; resize: vertical; }
    .checks { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
    .checks label {
      display: inline-flex; align-items: center; gap: 8px; min-height: 44px;
      margin: 0; padding: 0 12px; border-radius: 999px; border: 1px solid var(--line); color: #fff;
    }
    .form-msg { min-height: 24px; font-size: 14px; }
    .form-msg.error { color: #ff8d8d; }
    .form-msg.ok { color: var(--ice); }
    .cta-strip {
      margin-top: 22px; display: flex; justify-content: space-between; align-items: center; gap: 12px;
      padding: 14px 16px;
    }
    .site-footer {
      background: #02060C; border-top: 1px solid rgba(62,198,255,.16); padding: 56px 0 24px; color: var(--muted);
    }
    .foot-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1.1fr; gap: 24px; }
    .site-footer a:hover { color: var(--ice); }
    .copy { margin-top: 28px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,.06); font-size: 13px; }
    .mesh {
      background-image:
        linear-gradient(rgba(62,198,255,.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(62,198,255,.045) 1px, transparent 1px);
      background-size: 42px 42px;
    }
    @media (max-width: 1280px) {
      .metric-grid { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 1024px) {
      .nav-desk, .mainbar .btn-glow { display: none; }
      .burger { display: inline-flex; align-items: center; justify-content: center; }
      .hero-grid, .split, .split.reverse, .case-grid, .form-grid, .story-grid, .hot-grid, .service-grid { grid-template-columns: 1fr; }
      .scene-track { grid-template-columns: 1fr 1fr; }
      .scene-card.wide { grid-row: auto; }
      .scene-card.wide img { min-height: 220px; height: 220px; }
      .timeline { grid-template-columns: 1fr 1fr; }
      .timeline::before { display: none; }
      .news-item { grid-template-columns: 160px 1fr; }
      .news-item img { width: 160px; height: 100px; }
      .guard-grid, .foot-grid { grid-template-columns: 1fr 1fr; }
      .section, .dark-band { padding: 72px 0; }
    }
    @media (max-width: 768px) {
      .topbar-inner { flex-wrap: wrap; padding: 8px 0; }
      .hero { min-height: 78vh; }
      .hero-copy { padding-top: 28px; }
      .metric-grid, .service-grid, .guard-grid, .foot-grid, .scene-track, .timeline { grid-template-columns: 1fr; }
      .news-item { grid-template-columns: 1fr; }
      .news-item img { width: 100%; height: 180px; }
      h1 { font-size: 32px; }
      .cta-strip { flex-direction: column; align-items: stretch; }
    }
    @media (max-width: 520px) {
      .container { width: min(1240px, calc(100% - 24px)); }
      .section, .dark-band { padding: 48px 0; }
      .hero-ctrl { width: calc(100% - 24px); justify-content: center; }
    }