/* roulang page: index */
:root {
      --bg: #07161f;
      --bg-2: #0b1f2c;
      --bg-3: #0e2736;
      --navy: #08202c;
      --panel: rgba(10, 32, 46, 0.72);
      --panel-strong: rgba(8, 28, 40, 0.88);
      --glass: rgba(18, 48, 64, 0.55);
      --glass-2: rgba(14, 40, 54, 0.78);
      --line: rgba(126, 214, 214, 0.22);
      --line-2: rgba(168, 214, 228, 0.14);
      --text: #e8f4f6;
      --muted: #9bb8c4;
      --faint: #7b97a4;
      --teach: #2aa8d6;
      --teach-2: #1e8fbc;
      --mint: #7ee0d2;
      --vital: #5dcc8a;
      --warn: #d7c07a;
      --shadow: 0 18px 40px rgba(2, 10, 16, 0.38);
      --glow: 0 0 0 1px rgba(46, 180, 214, 0.28), 0 10px 28px rgba(24, 156, 196, 0.28);
      --radius: 18px;
      --radius-sm: 12px;
      --radius-pill: 999px;
      --space: 88px;
      --container: 1220px;
      --nav-h: 108px;
      --font: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
      --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: var(--font);
      background:
        radial-gradient(1200px 500px at 80% -10%, rgba(42, 168, 214, 0.16), transparent 55%),
        linear-gradient(180deg, #06141c 0%, var(--bg) 18%, #081820 100%);
      color: var(--text);
      font-size: 16px;
      line-height: 1.78;
      min-height: 100%;
    }
    img { max-width: 100%; display: block; height: auto; }
    a { color: var(--mint); text-decoration: none; transition: color .2s ease, opacity .2s ease; }
    a:hover { color: #b8fff3; }
    button, input, select, textarea { font-family: inherit; }
    button { cursor: pointer; }
    h1, h2, h3, h4 { margin: 0; letter-spacing: -0.02em; line-height: 1.28; font-weight: 650; }
    p { margin: 0 0 1em; }
    ul { margin: 0; padding: 0; list-style: none; }
    .skip {
      position: absolute; left: -999px; top: 8px;
      background: var(--teach); color: #04202a; padding: 10px 16px; border-radius: 10px; z-index: 80;
    }
    .skip:focus { left: 12px; }
    .container { width: min(var(--container), calc(100% - 40px)); margin: 0 auto; }
    .eyebrow {
      display: inline-flex; align-items: center; gap: 8px;
      color: var(--mint); font-size: 13px; letter-spacing: .12em; text-transform: none; font-weight: 600;
    }
    .eyebrow::before {
      content: ""; width: 18px; height: 2px; background: linear-gradient(90deg, var(--mint), transparent); border-radius: 2px;
    }
    .lead { color: var(--muted); max-width: 40em; font-size: 16px; }
    .section { padding: var(--space) 0; position: relative; }
    .section-head { margin-bottom: 36px; }
    .section-head h2 { font-size: clamp(26px, 3vw, 36px); margin: 10px 0 14px; }
    .glass {
      background: var(--glass);
      border: 1px solid var(--line);
      box-shadow: var(--shadow), inset 0 1px 0 rgba(186, 245, 255, 0.12);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-radius: var(--radius);
    }
    .glass-strong {
      background: var(--glass-2);
      border: 1px solid var(--line);
      box-shadow: var(--shadow), inset 0 1px 0 rgba(186, 245, 255, 0.1);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-radius: var(--radius);
    }
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      min-height: 46px; padding: 0 20px; border-radius: var(--radius-pill);
      border: 1px solid transparent; font-weight: 600; font-size: 15px; transition: .2s ease;
    }
    .btn-primary {
      background: linear-gradient(180deg, #3ec3e8, var(--teach-2));
      color: #04212c;
      box-shadow: var(--glow);
    }
    .btn-primary:hover { transform: translateY(-2px); filter: brightness(1.08); box-shadow: 0 0 0 1px rgba(90, 220, 240, .4), 0 14px 30px rgba(42, 168, 214, .42); }
    .btn-primary:active { transform: translateY(0) scale(.98); }
    .btn-ghost {
      background: rgba(12, 36, 48, .45);
      color: var(--text);
      border-color: rgba(126, 224, 210, .35);
    }
    .btn-ghost:hover { border-color: var(--mint); color: #fff; transform: translateY(-1px); }
    .btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
      outline: 2px solid var(--mint);
      outline-offset: 3px;
    }
    .badge {
      display: inline-flex; align-items: center; gap: 6px;
      padding: 7px 12px; border-radius: var(--radius-pill);
      background: rgba(18, 50, 66, .7); border: 1px solid var(--line); color: var(--mint); font-size: 13px;
    }
    .site-header { position: sticky; top: 0; z-index: 50; }
    .topbar {
      background: #041018;
      border-bottom: 1px solid rgba(126, 214, 214, .08);
      font-size: 13px; color: #b7cdd4;
    }
    .topbar-inner, .nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
    .topbar-inner { min-height: 38px; }
    .topbar-links { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
    .topbar a { color: #c5dce3; }
    .topbar a:hover { color: var(--mint); }
    .nav-row {
      background: rgba(7, 22, 31, .72);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid var(--line-2);
    }
    .site-header.is-solid .nav-row { background: rgba(6, 18, 26, .94); }
    .nav-inner { min-height: 70px; }
    .logo {
      display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 700; font-size: 18px; letter-spacing: .02em;
    }
    .logo-mark {
      width: 34px; height: 34px; border-radius: 10px;
      background: radial-gradient(circle at 30% 30%, #9ef3e6, #1ea8c8 58%, #0b4d63);
      box-shadow: 0 0 16px rgba(80, 220, 210, .35);
      position: relative;
    }
    .logo-mark::after {
      content: ""; position: absolute; inset: 9px 15px; background: #06222c; border-radius: 1px;
      box-shadow: 9px 0 0 #06222c, 0 9px 0 #06222c;
      transform: translate(-4px, -4px);
    }
    .menu { display: flex; align-items: center; gap: 4px; }
    .menu a {
      color: #d5e8ee; font-size: 14px; padding: 10px 11px; border-radius: 10px; position: relative;
    }
    .menu a:hover, .menu a.is-active { color: #fff; }
    .menu a.is-active::after, .menu a:hover::after {
      content: ""; position: absolute; left: 12px; right: 12px; bottom: 4px; height: 2px;
      background: linear-gradient(90deg, var(--mint), var(--teach));
      box-shadow: 0 0 10px var(--mint);
      border-radius: 2px;
    }
    .nav-cta { display: flex; align-items: center; gap: 10px; }
    .menu-toggle {
      display: none; width: 44px; height: 44px; border-radius: 12px;
      border: 1px solid var(--line); background: rgba(10, 30, 40, .7); color: #fff;
    }
    .menu-toggle span, .menu-toggle span::before, .menu-toggle span::after {
      display: block; width: 18px; height: 2px; background: #fff; position: relative; margin: 0 auto;
    }
    .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; }
    .hero {
      padding: 28px 0 20px;
      min-height: calc(100vh - var(--nav-h));
    }
    .hero-stage {
      position: relative; overflow: hidden; border-radius: 24px; min-height: 620px;
      border: 1px solid var(--line); box-shadow: var(--shadow);
    }
    .slides { position: relative; min-height: 620px; }
    .slide {
      position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity .55s ease;
      background: #08202b center/cover no-repeat;
    }
    .slide.is-on { opacity: 1; visibility: visible; position: relative; }
    .slide::before {
      content: ""; position: absolute; inset: 0;
      background:
        linear-gradient(90deg, rgba(5, 16, 24, .82) 0%, rgba(5, 18, 26, .55) 48%, rgba(5, 18, 26, .28) 100%),
        linear-gradient(180deg, rgba(4, 14, 20, .18), rgba(4, 14, 20, .55));
    }
    .hero-grid {
      position: relative; z-index: 2;
      display: grid; grid-template-columns: 1.15fr .85fr; gap: 28px; align-items: stretch;
      padding: 54px 48px; min-height: 620px;
    }
    .hero-copy h1 { font-size: clamp(32px, 4.4vw, 52px); max-width: 12em; margin: 12px 0 16px; }
    .hero-copy .lead { font-size: 17px; line-height: 1.8; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0 18px; }
    .hero-meta { display: flex; gap: 18px; flex-wrap: wrap; color: var(--muted); font-size: 13px; }
    .hero-meta b { color: var(--mint); font-weight: 650; }
    .console {
      align-self: center;
      padding: 22px;
      background: rgba(6, 20, 28, .78);
    }
    .console-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; color: var(--faint); font-size: 12px; }
    .dots { display: flex; gap: 6px; }
    .dots i { width: 8px; height: 8px; border-radius: 50%; background: #3d6a78; display: block; }
    .dots i:first-child { background: #5dcc8a; }
    .code {
      font-family: var(--mono); font-size: 13px; line-height: 1.7; color: #c8eef0; white-space: pre-wrap;
      background: rgba(3, 14, 20, .55); border: 1px solid var(--line-2); border-radius: 12px; padding: 16px;
    }
    .code .k { color: #7ee0d2; }
    .code .n { color: #9ad4f0; }
    .code .v { color: #d7c07a; }
    .hero-controls {
      position: absolute; z-index: 3; left: 24px; right: 24px; bottom: 22px;
      display: flex; align-items: center; justify-content: space-between; gap: 12px;
    }
    .pager { display: flex; gap: 8px; }
    .pager button, .ctrl-btn {
      width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line);
      background: rgba(8, 24, 34, .7); color: #fff; backdrop-filter: blur(10px);
    }
    .pager button.is-on, .ctrl-btn:hover { box-shadow: 0 0 0 3px rgba(126, 224, 210, .25); background: rgba(20, 70, 88, .8); }
    .kpi-grid {
      display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px;
    }
    .kpi-card { padding: 22px 18px; min-height: 168px; }
    .kpi-card .num {
      font-variant-numeric: tabular-nums; font-size: 38px; font-weight: 700; color: #fff; letter-spacing: -0.04em; line-height: 1;
    }
    .kpi-card .unit { color: var(--mint); font-size: 13px; margin-left: 4px; }
    .kpi-card h3 { font-size: 15px; margin: 12px 0 8px; }
    .kpi-card p { color: var(--faint); font-size: 13px; margin: 0; }
    .intro-grid {
      display: grid; grid-template-columns: 5fr 7fr; gap: 28px; align-items: center;
    }
    .intro-visual { position: relative; }
    .intro-visual img { width: 100%; height: 460px; object-fit: cover; border-radius: 20px; border: 1px solid var(--line); }
    .float-note {
      position: absolute; right: 16px; bottom: 16px; padding: 14px 16px; max-width: 250px; font-size: 13px;
    }
    .caps { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 22px; }
    .matrix-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .matrix-card { padding: 24px; min-height: 250px; display: flex; flex-direction: column; }
    .ico {
      width: 42px; height: 42px; border-radius: 12px; margin-bottom: 14px;
      display: grid; place-items: center; border: 1px solid var(--line); background: rgba(16, 54, 70, .7);
    }
    .ico svg { width: 22px; height: 22px; stroke: var(--mint); fill: none; stroke-width: 1.7; }
    .matrix-card h3 { font-size: 18px; margin-bottom: 10px; }
    .matrix-card p { color: var(--muted); font-size: 14.5px; flex: 1; }
    .matrix-card a { color: var(--mint); font-size: 14px; font-weight: 600; }
    .courses-grid { display: grid; grid-template-columns: 1.35fr 1fr 1fr; gap: 16px; }
    .course-card { overflow: hidden; display: flex; flex-direction: column; }
    .course-card img { width: 100%; height: 210px; object-fit: cover; }
    .course-body { padding: 22px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
    .course-body h3 { font-size: 20px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
    .meta { color: var(--mint); font-size: 13px; }
    .compare-wrap { display: grid; grid-template-columns: 1fr 1fr 280px; gap: 16px; }
    .compare-col { padding: 24px; }
    .compare-col h3 { margin-bottom: 16px; font-size: 20px; }
    .row { display: flex; justify-content: space-between; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--line-2); font-size: 14.5px; }
    .row span { color: var(--muted); }
    .hl { background: rgba(93, 204, 138, .12); border-left: 3px solid var(--vital); padding-left: 10px; }
    .verdict { padding: 24px; display: flex; flex-direction: column; justify-content: space-between; }
    .verdict strong { font-size: 22px; display: block; margin: 10px 0; }
    .cases {
      background:
        linear-gradient(180deg, rgba(4, 14, 20, .55), rgba(4, 16, 24, .82)),
        url("/assets/images/6c0f36f63f76850f.webp") center/cover no-repeat;
    }
    .cases::before {
      content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .18;
      background-image:
        linear-gradient(rgba(126,224,210,.12) 1px, transparent 1px),
        linear-gradient(90deg, rgba(126,224,210,.12) 1px, transparent 1px);
      background-size: 28px 28px;
    }
    .case-grid { display: grid; grid-template-columns: 1.4fr .8fr; gap: 16px; position: relative; }
    .main-case { padding: 0; overflow: hidden; }
    .main-case img { width: 100%; height: 280px; object-fit: cover; }
    .main-case .pad, .side-case { padding: 24px; }
    .side-stack { display: grid; gap: 16px; }
    .side-case { min-height: 180px; }
    .timeline { display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; position: relative; }
    .timeline::before {
      content: ""; position: absolute; left: 8%; right: 8%; top: 27px; height: 2px;
      background: linear-gradient(90deg, transparent, var(--teach), var(--mint), transparent);
    }
    .node { text-align: center; padding-top: 8px; }
    .node b {
      width: 18px; height: 18px; border-radius: 50%; display: inline-block; margin-bottom: 14px;
      background: var(--mint); box-shadow: 0 0 16px var(--mint); position: relative; z-index: 1;
    }
    .node h3 { font-size: 16px; margin-bottom: 8px; }
    .node p { color: var(--muted); font-size: 13px; }
    .scene-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .scene {
      min-height: 220px; padding: 26px; position: relative; overflow: hidden;
      display: flex; flex-direction: column; justify-content: flex-end;
      background-size: cover; background-position: center;
    }
    .scene::before {
      content: ""; position: absolute; inset: 0;
      background: linear-gradient(180deg, rgba(5,16,24,.15), rgba(5,16,24,.82));
    }
    .scene > * { position: relative; z-index: 1; }
    .stories-grid { display: grid; grid-template-columns: 1.4fr .8fr; gap: 16px; }
    .story-main { display: grid; grid-template-columns: 1.1fr 1fr; overflow: hidden; }
    .story-main img { width: 100%; height: 100%; min-height: 320px; object-fit: cover; }
    .story-main .pad, .mini-story { padding: 24px; }
    .mini-col { display: grid; gap: 16px; }
    .stats-bar {
      background: linear-gradient(90deg, #04141c, #0a2430 40%, #062028);
      border-block: 1px solid var(--line);
      padding: 48px 0;
    }
    .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
    .stats-grid .num { font-size: 42px; font-weight: 700; font-variant-numeric: tabular-nums; }
    .stats-grid p { color: var(--muted); font-size: 13px; margin: 8px 0 0; }
    .review-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .review { padding: 22px; min-height: 230px; display: flex; flex-direction: column; }
    .stars { color: var(--vital); letter-spacing: 2px; margin-bottom: 12px; }
    .review q { flex: 1; font-style: normal; color: #dff3f5; }
    .who { margin-top: 16px; color: var(--muted); font-size: 13px; }
    .news-list { display: grid; gap: 12px; }
    .news-item {
      display: grid; grid-template-columns: 110px 1fr auto; gap: 18px; align-items: center;
      padding: 18px 20px; border-left: 3px solid var(--teach);
    }
    .news-item time { color: var(--mint); font-size: 13px; font-variant-numeric: tabular-nums; }
    .news-item h3 { font-size: 17px; margin-bottom: 6px; }
    .news-item p { color: var(--muted); font-size: 14px; margin: 0; }
    .news-more { margin-top: 18px; }
    .guarantee-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
    .g-item { display: grid; grid-template-columns: 48px 1fr; gap: 14px; padding: 20px; align-items: start; }
    .chips { display: flex; flex-wrap: wrap; gap: 10px; }
    .chip {
      min-height: 44px; padding: 0 16px; border-radius: var(--radius-pill);
      border: 1px solid var(--line); background: rgba(10, 32, 44, .7); color: var(--text);
    }
    .chip[aria-expanded="true"] { border-color: var(--mint); box-shadow: 0 0 0 3px rgba(126,224,210,.15); }
    .quick-ans {
      margin-top: 16px; min-height: 64px; padding: 16px 18px; color: var(--muted);
    }
    .faq-list { display: grid; gap: 10px; }
    .faq-item { overflow: hidden; }
    .faq-item button {
      width: 100%; text-align: left; background: transparent; color: #fff; border: 0;
      padding: 18px 20px; font-size: 16px; font-weight: 650; display: flex; justify-content: space-between; gap: 12px;
      min-height: 58px;
    }
    .faq-item .ans { display: none; padding: 0 20px 18px; color: var(--muted); }
    .faq-item.is-open .ans { display: block; }
    .apply-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 22px; align-items: stretch; }
    .apply-copy { padding: 32px; }
    form { padding: 28px; display: grid; gap: 14px; }
    label { font-size: 13px; color: var(--mint); display: grid; gap: 6px; }
    input, select, textarea {
      width: 100%; min-height: 46px; border-radius: 12px; border: 1px solid var(--line);
      background: rgba(4, 16, 24, .7); color: #fff; padding: 10px 12px;
    }
    textarea { min-height: 96px; resize: vertical; }
    .form-msg { min-height: 24px; font-size: 14px; color: var(--vital); }
    .form-msg.err { color: #f0b4a4; }
    .site-footer {
      background: #030d13; border-top: 1px solid var(--line-2); padding: 56px 0 24px; color: #b7c9d0;
    }
    .foot-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1.1fr; gap: 28px; }
    .site-footer h3 { color: #fff; font-size: 16px; margin-bottom: 14px; }
    .site-footer a { color: #c5d8de; display: inline-block; padding: 4px 0; min-height: 32px; }
    .copy { margin-top: 28px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.06); font-size: 13px; color: #8aa0a8; }
    .ecg {
      position: absolute; right: 8%; top: 18px; width: 180px; height: 28px; opacity: .35; pointer-events: none;
    }
    @media (max-width: 1199px) {
      :root { --space: 72px; }
      .kpi-grid { grid-template-columns: repeat(3, 1fr); }
      .hero-grid, .intro-grid, .courses-grid, .compare-wrap, .case-grid, .stories-grid, .apply-grid, .review-grid {
        grid-template-columns: 1fr 1fr;
      }
      .compare-wrap, .courses-grid { grid-template-columns: 1fr; }
      .menu a { padding: 10px 8px; font-size: 13px; }
    }
    @media (max-width: 1024px) {
      .menu { display: none; }
      .menu.is-open {
        display: flex; flex-direction: column; position: absolute; left: 0; right: 0; top: 100%;
        background: rgba(5, 16, 24, .97); padding: 12px; border-bottom: 1px solid var(--line);
      }
      .menu.is-open a { min-height: 44px; display: flex; align-items: center; }
      .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
      .nav-inner { position: relative; }
      .hero-grid, .intro-grid, .matrix-grid, .stories-grid, .case-grid, .apply-grid, .guarantee-grid, .scene-grid, .stats-grid, .review-grid, .foot-grid, .timeline {
        grid-template-columns: 1fr;
      }
      .story-main { grid-template-columns: 1fr; }
      .timeline::before { display: none; }
      .node { text-align: left; display: grid; grid-template-columns: 24px 1fr; gap: 12px; align-items: start; }
      .hero-stage, .slides, .slide.is-on, .hero-grid { min-height: 0; }
      .hero-grid { padding: 28px 20px 86px; }
      .hero-copy h1 { font-size: 30px; }
      .news-item { grid-template-columns: 1fr; }
      .intro-visual img, .story-main img, .main-case img { height: 240px; min-height: 0; }
    }
    @media (max-width: 767px) {
      :root { --space: 56px; }
      .container { width: min(var(--container), calc(100% - 24px)); }
      .topbar-inner { overflow-x: auto; white-space: nowrap; }
      .kpi-grid { grid-template-columns: 1fr 1fr; }
      .hero { padding-top: 12px; }
      .pager button, .ctrl-btn, .chip, .btn { min-height: 44px; }
      .float-note { position: static; margin-top: 12px; max-width: none; }
    }
    @media (max-width: 520px) {
      .kpi-grid { grid-template-columns: 1fr; }
      .hero-actions { flex-direction: column; align-items: stretch; }
      .nav-cta .btn { display: none; }
    }