/* roulang page: index */
:root {
      --brand: #1F6FCC;
      --brand-ink: #0F3B66;
      --brand-deep: #1C64BB;
      --mint: #0E9A7A;
      --amber: #E08A1E;
      --bg: #F5F8FC;
      --surface: #FFFFFF;
      --line: #E4ECF4;
      --dark: #14324A;
      --text: #1C2B3A;
      --muted: #5B6B7C;
      --danger: #C2413B;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 999px;
      --shadow: 0 8px 28px rgba(16,52,92,.08);
      --shadow-hover: 0 12px 32px rgba(16,52,92,.12);
      --container: 1200px;
      --pad-y: 104px;
      --pad-m: 64px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      font-size: 16px;
      line-height: 1.75;
      color: var(--text);
      background: var(--bg);
      overflow-x: hidden;
    }
    img { max-width: 100%; display: block; height: auto; }
    a { color: var(--brand); text-decoration: none; transition: color .2s ease, opacity .2s ease; }
    a:hover { color: var(--brand-ink); }
    button, input, select, textarea { font-family: inherit; }
    button { cursor: pointer; }
    h1, h2, h3, h4 { color: var(--brand-ink); line-height: 1.35; margin: 0 0 12px; font-weight: 700; }
    p { margin: 0 0 16px; }
    .container { width: min(100% - 32px, var(--container)); margin: 0 auto; }
    .skip-link {
      position: absolute; left: -999px; top: 8px; background: var(--brand); color: #fff;
      padding: 8px 14px; border-radius: 8px; z-index: 80;
    }
    .skip-link:focus { left: 12px; }
    .num { font-variant-numeric: tabular-nums; font-feature-settings: "tnum"; }
    .site-header { position: relative; z-index: 50; }
    .topbar {
      background: #F8FBFE;
      border-bottom: 1px solid var(--line);
      font-size: 13px;
      color: var(--muted);
      transition: max-height .28s ease, padding .28s ease, opacity .28s ease;
      max-height: 56px;
      overflow: hidden;
    }
    .topbar-inner {
      width: min(100% - 32px, var(--container));
      margin: 0 auto;
      min-height: 40px;
      display: grid;
      grid-template-columns: 1.2fr 1fr auto;
      gap: 12px;
      align-items: center;
      padding: 6px 0;
    }
    .topbar a { color: var(--brand-ink); }
    .topbar a:hover { color: var(--brand); }
    .trust-pills { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
    .pill {
      display: inline-flex; align-items: center; gap: 6px;
      border: 1px solid var(--line); background: #fff; color: var(--brand-ink);
      border-radius: var(--radius-pill); padding: 4px 10px; font-size: 12px; font-weight: 500;
    }
    .header-scrolled .topbar { max-height: 0; padding: 0; opacity: 0; border: 0; }
    .mainbar {
      background: #fff;
      box-shadow: 0 6px 18px rgba(16,52,92,.06);
      position: sticky; top: 0; z-index: 60;
    }
    .mainbar-inner {
      width: min(100% - 32px, var(--container));
      margin: 0 auto;
      min-height: 68px;
      display: flex; align-items: center; justify-content: space-between; gap: 18px;
    }
    .logo { display: flex; align-items: center; gap: 10px; color: inherit; min-height: 44px; }
    .logo:hover { color: inherit; opacity: .92; }
    .logo-mark {
      width: 38px; height: 38px; border-radius: 10px;
      background: linear-gradient(180deg, var(--brand), #0F3B66);
      color: #fff; display: grid; place-items: center; font-weight: 700; letter-spacing: .5px; font-size: 12px;
    }
    .logo-name { font-size: 18px; font-weight: 700; color: var(--brand-ink); line-height: 1.15; }
    .logo-sub { font-size: 12px; color: var(--brand); font-weight: 500; letter-spacing: .04em; }
    .nav-desk { display: flex; align-items: center; gap: 4px; flex: 1; justify-content: flex-end; }
    .nav-desk a {
      color: var(--text); font-size: 14px; font-weight: 500; padding: 8px 10px; position: relative; white-space: nowrap;
    }
    .nav-desk a::after {
      content: ""; position: absolute; left: 10px; right: 10px; bottom: 4px; height: 2px;
      background: var(--brand); transform: scaleX(0); transform-origin: left; transition: transform .2s ease;
    }
    .nav-desk a:hover, .nav-desk a.is-active { color: var(--brand); }
    .nav-desk a.is-active::after, .nav-desk a:hover::after { transform: scaleX(1); }
    .burger {
      display: none; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 8px; background: #fff;
      align-items: center; justify-content: center; flex-direction: column; gap: 5px;
    }
    .burger span { width: 18px; height: 2px; background: var(--brand-ink); display: block; }
    .drawer {
      position: fixed; inset: 0; background: rgba(15,59,102,.38); opacity: 0; pointer-events: none;
      transition: opacity .2s ease; z-index: 70;
    }
    .drawer.open { opacity: 1; pointer-events: auto; }
    .drawer-panel {
      position: absolute; right: 0; top: 0; height: 100%; width: min(86vw, 360px); background: #fff;
      box-shadow: var(--shadow-hover); padding: 20px 16px; transform: translateX(100%); transition: transform .24s ease;
      overflow: auto;
    }
    .drawer.open .drawer-panel { transform: none; }
    .drawer-panel a {
      display: flex; align-items: center; min-height: 44px; padding: 8px 12px; color: var(--brand-ink);
      border-left: 3px solid transparent; font-weight: 500;
    }
    .drawer-panel a.is-active, .drawer-panel a:hover { background: #F3F8FD; border-left-color: var(--brand); color: var(--brand); }
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      min-height: 44px; padding: 0 18px; border-radius: var(--radius-btn); font-weight: 600; font-size: 14px;
      border: 1px solid transparent; transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
    }
    .btn-primary { background: var(--brand); color: #fff; box-shadow: 0 8px 18px rgba(31,111,204,.22); }
    .btn-primary:hover { background: var(--brand-deep); color: #fff; transform: translateY(-1px); }
    .btn-ghost { background: #fff; color: var(--brand-ink); border-color: #C9DBEE; }
    .btn-ghost:hover { border-color: var(--brand); color: var(--brand); background: #F4F9FF; }
    .btn:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible {
      outline: 2px solid var(--brand); outline-offset: 2px;
    }
    .section { padding: var(--pad-y) 0; }
    .section-alt { background: #fff; }
    .section-head { max-width: 760px; margin-bottom: 36px; }
    .section-head h2 { font-size: 30px; }
    .section-head p { color: var(--muted); margin: 0; }
    .eyebrow {
      display: inline-flex; align-items: center; gap: 8px; color: var(--brand); font-size: 13px; font-weight: 600;
      margin-bottom: 10px; letter-spacing: .04em;
    }
    .card {
      background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-card);
      box-shadow: var(--shadow); transition: transform .2s ease, box-shadow .2s ease;
    }
    .card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
    .badge {
      display: inline-flex; align-items: center; gap: 6px; background: #EAF3FC; color: var(--brand-ink);
      border-radius: var(--radius-pill); padding: 6px 12px; font-size: 13px; font-weight: 600;
    }
    .hero { position: relative; background: #E7F0F8; }
    .slides { position: relative; min-height: 640px; }
    .slide { position: absolute; inset: 0; opacity: 0; pointer-events: none; transition: opacity .45s ease; }
    .slide.is-on { opacity: 1; pointer-events: auto; }
    .slide img {
      width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0;
    }
    .slide-mask {
      position: absolute; inset: 0;
      background: linear-gradient(90deg, rgba(245,248,252,.94) 0%, rgba(245,248,252,.82) 42%, rgba(245,248,252,.28) 100%);
    }
    .slide-copy {
      position: relative; z-index: 2; width: min(100% - 32px, var(--container)); margin: 0 auto;
      padding: 92px 0 150px; max-width: 720px; margin-left: max(16px, calc((100% - var(--container)) / 2));
    }
    .slide-copy h1, .slide-copy h2 { font-size: 40px; margin-bottom: 16px; }
    .slide-copy .lead { font-size: 16px; color: #334556; max-width: 640px; }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 22px 0 18px; }
    .hero-mini {
      display: flex; gap: 18px; flex-wrap: wrap; padding-top: 8px;
    }
    .hero-mini div { min-width: 140px; }
    .hero-mini strong { display: block; font-size: 20px; color: var(--brand-ink); }
    .hero-mini span { font-size: 12px; color: var(--muted); }
    .hero-bar {
      position: absolute; left: 0; right: 0; bottom: 0; z-index: 3;
      background: rgba(255,255,255,.92); border-top: 1px solid var(--line); backdrop-filter: blur(8px);
    }
    .hero-bar-inner {
      width: min(100% - 32px, var(--container)); margin: 0 auto;
      display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap;
      padding: 8px 0;
    }
    .count { display: flex; gap: 8px; align-items: center; }
    .count b {
      min-width: 42px; height: 42px; display: grid; place-items: center; background: var(--brand-ink); color: #fff;
      border-radius: 8px; font-size: 18px;
    }
    .carousel-ui {
      position: absolute; right: max(16px, calc((100% - var(--container)) / 2)); top: 50%;
      transform: translateY(-50%); z-index: 4; display: flex; flex-direction: column; gap: 8px;
    }
    .icon-btn {
      width: 44px; height: 44px; border-radius: 8px; border: 1px solid #C9DBEE; background: #fff; color: var(--brand-ink);
      display: grid; place-items: center;
    }
    .icon-btn:hover { background: var(--brand); color: #fff; border-color: var(--brand); }
    .dots { position: absolute; left: 50%; bottom: 78px; transform: translateX(-50%); z-index: 4; display: flex; gap: 8px; }
    .dots button { width: 10px; height: 10px; border-radius: 99px; border: 0; background: #C5D5E6; }
    .dots button.is-on { background: var(--brand); width: 22px; }
    .bento { display: grid; grid-template-columns: 1.35fr 1fr 1fr; grid-template-rows: auto auto; gap: 16px; }
    .kpi-main { grid-row: span 2; padding: 28px; }
    .kpi-main .value { font-size: 64px; color: var(--brand); line-height: 1; margin: 12px 0; }
    .kpi-sub { padding: 20px; }
    .delta-up { color: var(--mint); font-weight: 600; }
    .delta-down { color: var(--amber); font-weight: 600; }
    .note { color: var(--muted); font-size: 13px; margin: 8px 0 0; }
    .split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 40px; align-items: center; }
    .cover { border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); }
    .cover img { width: 100%; aspect-ratio: 16/10; object-fit: cover; }
    .badge-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
    .matrix { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
    .matrix article { padding: 22px; }
    .matrix h3 { font-size: 18px; }
    .metric-chip {
      display: inline-block; background: #E8F7F2; color: #0B7A61; border-radius: 999px; padding: 4px 10px;
      font-size: 12px; font-weight: 700; margin-bottom: 10px;
    }
    .product-rail { display: grid; gap: 18px; }
    .product-card { display: grid; grid-template-columns: 280px 1fr auto; gap: 22px; padding: 16px; align-items: center; }
    .product-card img { width: 100%; height: 180px; object-fit: cover; border-radius: 10px; }
    .product-card ul { margin: 8px 0 0; padding-left: 18px; color: var(--muted); }
    .compare-wrap { overflow: auto; }
    .compare-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); }
    .compare-table th, .compare-table td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--line); }
    .compare-table th { background: #F3F7FB; color: var(--brand-ink); font-weight: 700; }
    .compare-table td:nth-child(3) { color: #0B7A61; font-weight: 600; }
    .fine { font-size: 13px; color: var(--muted); margin-top: 12px; }
    .dark-block { background: #14324A; color: #E7EEF5; padding: var(--pad-y) 0; }
    .dark-block h2, .dark-block h3 { color: #fff; }
    .dark-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 28px; align-items: start; }
    .case-grid { display: grid; gap: 16px; }
    .case-card { display: grid; grid-template-columns: 140px 1fr; gap: 14px; padding: 14px; }
    .case-card img { width: 140px; height: 96px; object-fit: cover; border-radius: 8px; }
    .timeline {
      display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; position: relative;
    }
    .timeline::before {
      content: ""; position: absolute; left: 8%; right: 8%; top: 22px; height: 2px; background: #D5E4F2;
    }
    .node { position: relative; background: #fff; padding: 22px 16px 16px; }
    .dot {
      width: 14px; height: 14px; border-radius: 50%; background: var(--brand); border: 3px solid #fff;
      box-shadow: 0 0 0 2px var(--brand); margin-bottom: 12px; position: relative; z-index: 1;
    }
    .stories { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
    .story { overflow: hidden; }
    .story img { width: 100%; height: 220px; object-fit: cover; }
    .story-body { padding: 20px; }
    .quote { font-size: 16px; color: var(--brand-ink); margin-bottom: 12px; }
    .stats {
      background: #EAF3FC; padding: 42px 0;
    }
    .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; text-align: center; }
    .stats-grid strong { display: block; font-size: 36px; color: var(--brand); }
    .reviews { display: grid; grid-template-columns: 1.1fr .9fr; gap: 16px; }
    .reviews article { padding: 22px; }
    .reviews article:nth-child(2) { margin-top: 28px; }
    .reviews article:nth-child(3) { margin-top: -12px; }
    .role { font-size: 13px; color: var(--muted); }
    .stars { color: var(--brand); letter-spacing: 2px; font-size: 13px; margin-bottom: 8px; }
    .news-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 18px; }
    .news-feature img { width: 100%; height: 280px; object-fit: cover; border-radius: 12px 12px 0 0; }
    .news-feature .body, .news-item { padding: 18px; }
    .news-list { display: grid; gap: 12px; }
    .news-item { display: grid; grid-template-columns: 112px 1fr; gap: 12px; align-items: center; }
    .news-item img { width: 112px; height: 76px; object-fit: cover; border-radius: 8px; }
    .news-extra { display: none; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
    .news-extra.open { display: grid; }
    .date { font-size: 12px; color: var(--muted); }
    .trust-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .trust-item { display: grid; grid-template-columns: 48px 1fr; gap: 14px; padding: 18px; align-items: start; }
    .ico {
      width: 48px; height: 48px; border-radius: 12px; background: #EAF3FC; color: var(--brand);
      display: grid; place-items: center;
    }
    .quick-box { display: grid; grid-template-columns: .9fr 1.1fr; gap: 22px; }
    .chips { display: flex; flex-wrap: wrap; gap: 8px; }
    .chip {
      min-height: 44px; border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 0 14px;
      color: var(--brand-ink); font-weight: 600; font-size: 14px;
    }
    .chip.is-on { background: var(--brand); color: #fff; border-color: var(--brand); }
    .quick-answer { padding: 24px; min-height: 180px; }
    .faq-list { display: grid; gap: 10px; }
    .faq-item { background: #fff; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
    .faq-item button {
      width: 100%; text-align: left; background: #fff; border: 0; min-height: 56px; padding: 14px 18px;
      display: flex; justify-content: space-between; gap: 12px; font-size: 16px; font-weight: 600; color: var(--brand-ink);
    }
    .faq-item .plus { transition: transform .2s ease; color: var(--brand); font-size: 22px; line-height: 1; }
    .faq-item.open .plus { transform: rotate(45deg); }
    .faq-item .ans { display: none; padding: 0 18px 16px; color: var(--muted); }
    .faq-item.open .ans { display: block; }
    .form-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 24px; align-items: start; }
    .book { padding: 24px; }
    .book img { width: 100%; height: 180px; object-fit: cover; border-radius: 10px; margin-bottom: 14px; }
    .form-card { padding: 24px; }
    label { display: block; font-size: 13px; font-weight: 600; color: var(--brand-ink); margin: 0 0 6px; }
    .field { margin-bottom: 14px; }
    input, select, textarea {
      width: 100%; min-height: 44px; border: 1px solid #D5E1EC; border-radius: 8px; padding: 10px 12px; background: #fff; color: var(--text);
    }
    textarea { min-height: 90px; resize: vertical; }
    input.err, select.err { border-color: var(--danger); }
    .err-text { color: var(--danger); font-size: 12px; display: none; margin-top: 4px; }
    .checks { display: flex; flex-wrap: wrap; gap: 8px 14px; }
    .checks label { font-weight: 500; display: flex; align-items: center; gap: 6px; min-height: 32px; }
    .ok-msg { display: none; background: #E8F7F2; color: #0B7A61; border-radius: 8px; padding: 12px 14px; margin-bottom: 12px; }
    .site-footer { background: #E8EEF5; border-top: 1px solid var(--line); padding: 48px 0 20px; color: #3D4E5F; }
    .foot-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr 1fr; gap: 24px; margin-bottom: 28px; }
    .site-footer h3 { font-size: 16px; }
    .site-footer a { color: #3D4E5F; display: inline-block; min-height: 32px; }
    .site-footer a:hover { color: var(--brand); }
    .copy { border-top: 1px solid #D5DEE8; padding-top: 14px; font-size: 13px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
    @media (max-width: 1280px) {
      .slide-copy h1, .slide-copy h2 { font-size: 36px; }
    }
    @media (max-width: 1024px) {
      .nav-desk { display: none; }
      .burger { display: inline-flex; }
      .topbar-inner { grid-template-columns: 1fr auto; }
      .top-mail { display: none; }
      .bento, .matrix, .split, .dark-grid, .timeline, .stories, .stats-grid, .reviews, .news-grid, .trust-grid, .quick-box, .form-grid, .foot-grid, .product-card {
        grid-template-columns: 1fr 1fr;
      }
      .kpi-main, .product-card { grid-column: span 2; }
      .product-card { grid-template-columns: 220px 1fr; }
      .timeline { grid-template-columns: 1fr 1fr; }
      .timeline::before { display: none; }
      .section-head h2 { font-size: 26px; }
      .slides { min-height: 580px; }
    }
    @media (max-width: 768px) {
      :root { --pad-y: var(--pad-m); }
      .bento, .matrix, .split, .dark-grid, .stories, .stats-grid, .reviews, .news-grid, .trust-grid, .quick-box, .form-grid, .foot-grid, .product-card, .case-card, .news-item, .news-extra.open {
        grid-template-columns: 1fr;
      }
      .kpi-main, .product-card { grid-column: auto; }
      .product-card { grid-template-columns: 1fr; }
      .reviews article:nth-child(2), .reviews article:nth-child(3) { margin-top: 0; }
      .slide-copy { padding: 72px 0 168px; max-width: none; margin-left: auto; }
      .slide-copy h1, .slide-copy h2 { font-size: 28px; }
      .carousel-ui { top: auto; bottom: 92px; right: 16px; flex-direction: row; transform: none; }
      .case-card img, .news-item img { width: 100%; height: 160px; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .topbar-inner { display: flex; justify-content: space-between; }
    }
    @media (max-width: 520px) {
      .trust-pills .btn { display: none; }
      .hero-mini div { min-width: 46%; }
      .count b { min-width: 36px; height: 36px; font-size: 15px; }
      .kpi-main .value { font-size: 48px; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { animation: none !important; transition: none !important; }
    }