/* roulang page: index */
:root {
      --color-primary: #1866e3;
      --color-primary-dark: #0f4fba;
      --color-primary-soft: #e8f1ff;
      --color-secondary: #10b6d1;
      --color-accent: #ffb44c;
      --color-ink: #102033;
      --color-text: #344258;
      --color-muted: #6f7f95;
      --color-light: #f6f9ff;
      --color-white: #ffffff;
      --color-border: #dbe6f5;
      --color-border-strong: #c7d7ee;
      --color-success: #19a77c;
      --color-warning: #f2a736;
      --shadow-sm: 0 8px 24px rgba(18, 62, 118, .08);
      --shadow-md: 0 18px 48px rgba(18, 62, 118, .12);
      --shadow-lg: 0 28px 70px rgba(18, 62, 118, .16);
      --radius-sm: 12px;
      --radius-md: 18px;
      --radius-lg: 28px;
      --radius-xl: 36px;
      --container: 1180px;
      --nav-height: 76px;
      --transition: 180ms ease;
    }

    *, *::before, *::after {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      -webkit-text-size-adjust: 100%;
    }

    body {
      margin: 0;
      color: var(--color-text);
      background:
        radial-gradient(circle at 18% 0%, rgba(24, 102, 227, .10), transparent 34%),
        radial-gradient(circle at 88% 12%, rgba(16, 182, 209, .12), transparent 28%),
        linear-gradient(180deg, #f8fbff 0%, #ffffff 42%, #f7faff 100%);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
      font-size: 16px;
      line-height: 1.75;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color var(--transition), background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
    }

    a:hover,
    a:focus {
      color: var(--color-primary);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button,
    input {
      font: inherit;
    }

    button {
      cursor: pointer;
      border: 0;
    }

    input {
      min-width: 0;
    }

    ::selection {
      color: var(--color-white);
      background: var(--color-primary);
    }

    :focus-visible {
      outline: 3px solid rgba(24, 102, 227, .28);
      outline-offset: 3px;
    }

    .site-wrap {
      min-height: 100vh;
    }

    .container {
      width: min(calc(100% - 40px), var(--container));
      margin-inline: auto;
    }

    .section {
      padding: 88px 0;
      position: relative;
    }

    .section-tight {
      padding: 64px 0;
    }

    .section-header {
      max-width: 760px;
      margin-bottom: 32px;
    }

    .section-eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      margin-bottom: 14px;
      border: 1px solid rgba(24, 102, 227, .16);
      border-radius: 999px;
      color: var(--color-primary-dark);
      background: rgba(232, 241, 255, .82);
      font-size: 13px;
      font-weight: 700;
      letter-spacing: .02em;
    }

    .section-title {
      margin: 0;
      color: var(--color-ink);
      font-size: clamp(28px, 4vw, 46px);
      line-height: 1.18;
      letter-spacing: -.04em;
      font-weight: 850;
    }

    .section-desc {
      margin: 14px 0 0;
      color: var(--color-muted);
      font-size: 17px;
      max-width: 720px;
    }

    .muted {
      color: var(--color-muted);
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 7px 11px;
      border-radius: 999px;
      color: var(--color-primary-dark);
      background: var(--color-primary-soft);
      font-size: 13px;
      font-weight: 700;
      white-space: nowrap;
    }

    .badge.warning {
      color: #875211;
      background: #fff3dd;
    }

    .badge.success {
      color: #087157;
      background: #def8ef;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      min-height: 46px;
      padding: 12px 18px;
      border-radius: 999px;
      font-weight: 800;
      line-height: 1.2;
      border: 1px solid transparent;
      box-shadow: none;
      user-select: none;
    }

    .btn-primary {
      color: var(--color-white);
      background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
      box-shadow: 0 14px 28px rgba(24, 102, 227, .24);
    }

    .btn-primary:hover,
    .btn-primary:focus {
      color: var(--color-white);
      transform: translateY(-2px);
      box-shadow: 0 18px 36px rgba(24, 102, 227, .30);
    }

    .btn-ghost {
      color: var(--color-primary-dark);
      background: rgba(255, 255, 255, .78);
      border-color: var(--color-border);
    }

    .btn-ghost:hover,
    .btn-ghost:focus {
      color: var(--color-primary-dark);
      background: var(--color-white);
      border-color: rgba(24, 102, 227, .30);
      transform: translateY(-2px);
      box-shadow: var(--shadow-sm);
    }

    .btn-soft {
      color: var(--color-primary-dark);
      background: var(--color-primary-soft);
      border-color: rgba(24, 102, 227, .10);
    }

    .btn-soft:hover,
    .btn-soft:focus {
      color: var(--color-white);
      background: var(--color-primary);
      box-shadow: 0 12px 28px rgba(24, 102, 227, .22);
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      padding: 18px 0 12px;
      backdrop-filter: blur(16px);
    }

    .nav-shell {
      width: min(calc(100% - 36px), 1220px);
      margin-inline: auto;
      border: 1px solid rgba(199, 215, 238, .78);
      border-radius: 26px;
      background: rgba(255, 255, 255, .82);
      box-shadow: 0 18px 42px rgba(18, 62, 118, .10);
    }

    .main-nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      min-height: var(--nav-height);
      padding: 12px 16px 12px 20px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 11px;
      color: var(--color-ink);
      font-weight: 900;
      letter-spacing: -.03em;
      white-space: nowrap;
    }

    .brand-mark {
      width: 40px;
      height: 40px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      color: var(--color-white);
      background:
        radial-gradient(circle at 35% 25%, rgba(255, 255, 255, .48), transparent 22%),
        linear-gradient(135deg, var(--color-primary), var(--color-secondary));
      box-shadow: 0 12px 24px rgba(24, 102, 227, .25);
    }

    .brand-text {
      display: flex;
      flex-direction: column;
      line-height: 1.1;
    }

    .brand-title {
      font-size: 17px;
    }

    .brand-sub {
      margin-top: 4px;
      color: var(--color-muted);
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0;
    }

    .nav-center {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 6px;
      border-radius: 999px;
      background: rgba(246, 249, 255, .86);
      border: 1px solid rgba(219, 230, 245, .74);
    }

    .nav-link {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      min-height: 38px;
      padding: 9px 14px;
      border-radius: 999px;
      color: var(--color-muted);
      font-size: 14px;
      font-weight: 800;
    }

    .nav-link:hover,
    .nav-link:focus {
      color: var(--color-primary);
      background: var(--color-white);
    }

    .nav-link.active {
      color: var(--color-primary-dark);
      background: var(--color-white);
      box-shadow: inset 0 0 0 1px rgba(24, 102, 227, .10);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .nav-search {
      display: flex;
      align-items: center;
      gap: 8px;
      width: 260px;
      height: 44px;
      padding: 0 8px 0 14px;
      border: 1px solid var(--color-border);
      border-radius: 999px;
      background: rgba(255, 255, 255, .86);
      transition: border-color var(--transition), box-shadow var(--transition);
    }

    .nav-search:focus-within {
      border-color: rgba(24, 102, 227, .46);
      box-shadow: 0 0 0 4px rgba(24, 102, 227, .10);
    }

    .nav-search i {
      color: var(--color-muted);
      font-size: 14px;
    }

    .nav-search input {
      width: 100%;
      border: 0;
      outline: none;
      color: var(--color-ink);
      background: transparent;
      font-size: 14px;
    }

    .nav-search input::placeholder {
      color: #93a1b5;
    }

    .nav-search button {
      width: 30px;
      height: 30px;
      border-radius: 50%;
      color: var(--color-white);
      background: var(--color-primary);
      transition: transform var(--transition), background var(--transition);
    }

    .nav-search button:hover {
      background: var(--color-primary-dark);
      transform: scale(1.04);
    }

    .menu-toggle {
      display: none;
      width: 44px;
      height: 44px;
      border-radius: 15px;
      color: var(--color-primary-dark);
      background: var(--color-primary-soft);
    }

    .hero {
      padding: 62px 0 78px;
    }

    .hero-panel {
      overflow: hidden;
      border: 1px solid rgba(199, 215, 238, .74);
      border-radius: var(--radius-xl);
      background:
        linear-gradient(135deg, rgba(255, 255, 255, .92), rgba(241, 247, 255, .92)),
        radial-gradient(circle at 15% 20%, rgba(24, 102, 227, .10), transparent 36%);
      box-shadow: var(--shadow-lg);
    }

    .hero-top {
      display: grid;
      grid-template-columns: minmax(0, 1.1fr) minmax(310px, .9fr);
      gap: 28px;
      align-items: stretch;
      padding: clamp(28px, 5vw, 58px);
    }

    .hero-copy {
      display: flex;
      flex-direction: column;
      justify-content: center;
      min-height: 360px;
    }

    .hero-kicker {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 10px;
      margin-bottom: 18px;
    }

    .hero h1 {
      margin: 0;
      max-width: 760px;
      color: var(--color-ink);
      font-size: clamp(38px, 6vw, 72px);
      line-height: 1.05;
      letter-spacing: -.065em;
      font-weight: 900;
    }

    .hero-lead {
      max-width: 710px;
      margin: 22px 0 0;
      color: #4a5a70;
      font-size: clamp(17px, 2vw, 20px);
      line-height: 1.85;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 30px;
    }

    .hero-points {
      display: flex;
      flex-wrap: wrap;
      gap: 11px;
      margin-top: 28px;
    }

    .point {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 10px 13px;
      border: 1px solid rgba(219, 230, 245, .90);
      border-radius: 999px;
      color: var(--color-text);
      background: rgba(255, 255, 255, .76);
      font-weight: 750;
      font-size: 14px;
    }

    .point i {
      color: var(--color-success);
    }

    .hero-demo {
      position: relative;
      display: grid;
      align-content: center;
      gap: 16px;
      min-height: 360px;
    }

    .demo-card {
      border: 1px solid rgba(199, 215, 238, .86);
      border-radius: 26px;
      background: rgba(255, 255, 255, .92);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    .demo-card.main {
      padding: 22px;
    }

    .demo-topline {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 16px;
    }

    .window-dots {
      display: flex;
      gap: 6px;
    }

    .window-dots span {
      width: 9px;
      height: 9px;
      border-radius: 50%;
      background: #d9e5f5;
    }

    .window-dots span:nth-child(1) {
      background: #ffbd70;
    }

    .window-dots span:nth-child(2) {
      background: #70ddab;
    }

    .window-dots span:nth-child(3) {
      background: #7aa6ff;
    }

    .demo-label {
      color: var(--color-muted);
      font-size: 13px;
      font-weight: 800;
    }

    .demo-searchbar {
      display: flex;
      gap: 10px;
      padding: 10px;
      border-radius: 20px;
      background: var(--color-light);
      border: 1px solid var(--color-border);
    }

    .demo-searchbar span {
      flex: 1;
      display: flex;
      align-items: center;
      gap: 10px;
      min-height: 46px;
      padding: 0 14px;
      border-radius: 15px;
      color: var(--color-muted);
      background: var(--color-white);
      font-weight: 700;
    }

    .demo-searchbar i {
      color: var(--color-primary);
    }

    .demo-searchbar .mini-btn {
      min-width: 92px;
      padding: 0 14px;
      border-radius: 15px;
      color: var(--color-white);
      background: var(--color-primary);
      font-weight: 850;
    }

    .demo-status {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-top: 16px;
    }

    .status-item {
      padding: 14px 12px;
      border-radius: 18px;
      background: linear-gradient(180deg, #ffffff, #f5f9ff);
      border: 1px solid var(--color-border);
    }

    .status-item strong {
      display: block;
      color: var(--color-ink);
      font-size: 20px;
      line-height: 1.2;
    }

    .status-item span {
      color: var(--color-muted);
      font-size: 12px;
      font-weight: 700;
    }

    .demo-list {
      display: grid;
      gap: 10px;
      padding: 16px;
    }

    .demo-row {
      display: grid;
      grid-template-columns: 36px 1fr auto;
      gap: 12px;
      align-items: center;
      padding: 12px;
      border-radius: 18px;
      background: rgba(246, 249, 255, .88);
      border: 1px solid rgba(219, 230, 245, .82);
    }

    .demo-icon {
      width: 36px;
      height: 36px;
      display: grid;
      place-items: center;
      border-radius: 13px;
      color: var(--color-primary);
      background: var(--color-primary-soft);
    }

    .demo-row strong {
      display: block;
      color: var(--color-ink);
      line-height: 1.3;
    }

    .demo-row small {
      color: var(--color-muted);
      font-weight: 700;
    }

    .hero-bottom {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1px;
      border-top: 1px solid var(--color-border);
      background: var(--color-border);
    }

    .hero-mini {
      padding: 22px;
      background: rgba(255, 255, 255, .76);
    }

    .hero-mini strong {
      display: block;
      color: var(--color-ink);
      font-size: 16px;
    }

    .hero-mini span {
      display: block;
      margin-top: 6px;
      color: var(--color-muted);
      font-size: 14px;
      line-height: 1.55;
    }

    .app-band {
      border-radius: var(--radius-xl);
      overflow: hidden;
      background: linear-gradient(135deg, #0f2748, #144fa5 52%, #16a5bf);
      box-shadow: var(--shadow-lg);
    }

    .app-grid {
      display: grid;
      grid-template-columns: .88fr 1.12fr;
      gap: 0;
      align-items: stretch;
    }

    .app-copy {
      padding: clamp(30px, 5vw, 54px);
      color: var(--color-white);
    }

    .app-copy .section-eyebrow {
      color: #dff3ff;
      background: rgba(255, 255, 255, .12);
      border-color: rgba(255, 255, 255, .18);
    }

    .app-copy .section-title {
      color: var(--color-white);
      font-size: clamp(28px, 4vw, 44px);
    }

    .app-copy .section-desc {
      color: rgba(255, 255, 255, .76);
    }

    .app-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 28px;
    }

    .app-actions .btn-ghost {
      color: var(--color-white);
      background: rgba(255, 255, 255, .12);
      border-color: rgba(255, 255, 255, .22);
    }

    .app-actions .btn-ghost:hover {
      background: rgba(255, 255, 255, .20);
      color: var(--color-white);
    }

    .app-stage {
      padding: clamp(24px, 4vw, 44px);
      background:
        radial-gradient(circle at 70% 22%, rgba(255, 255, 255, .18), transparent 32%),
        rgba(255, 255, 255, .08);
    }

    .sync-board {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
    }

    .sync-card {
      min-height: 150px;
      padding: 18px;
      border: 1px solid rgba(255, 255, 255, .18);
      border-radius: 24px;
      color: var(--color-white);
      background: rgba(255, 255, 255, .12);
      backdrop-filter: blur(12px);
    }

    .sync-card:nth-child(3) {
      grid-column: span 2;
      min-height: auto;
    }

    .sync-card i {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      margin-bottom: 16px;
      border-radius: 15px;
      background: rgba(255, 255, 255, .16);
      color: #dff3ff;
    }

    .sync-card strong {
      display: block;
      margin-bottom: 8px;
      font-size: 18px;
    }

    .sync-card p {
      margin: 0;
      color: rgba(255, 255, 255, .74);
      line-height: 1.65;
    }

    .service-layout {
      display: grid;
      grid-template-columns: 360px 1fr;
      gap: 26px;
      align-items: start;
    }

    .service-aside {
      position: sticky;
      top: 112px;
      padding: 26px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, .86);
      box-shadow: var(--shadow-sm);
    }

    .service-aside p {
      margin: 12px 0 22px;
      color: var(--color-muted);
    }

    .service-checks {
      display: grid;
      gap: 12px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .service-checks li {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      color: var(--color-text);
      font-weight: 700;
    }

    .service-checks i {
      margin-top: 5px;
      color: var(--color-success);
    }

    .service-cards {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px;
    }

    .card {
      position: relative;
      padding: 24px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, .88);
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }

    .card:hover {
      transform: translateY(-5px);
      border-color: rgba(24, 102, 227, .28);
      box-shadow: var(--shadow-md);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      display: grid;
      place-items: center;
      margin-bottom: 18px;
      border-radius: 17px;
      color: var(--color-primary);
      background: var(--color-primary-soft);
      font-size: 20px;
    }

    .card h3 {
      margin: 0 0 10px;
      color: var(--color-ink);
      font-size: 21px;
      line-height: 1.3;
      letter-spacing: -.02em;
      font-weight: 850;
    }

    .card p {
      margin: 0;
      color: var(--color-muted);
      line-height: 1.7;
    }

    .category-strip {
      overflow: hidden;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-xl);
      background: rgba(255, 255, 255, .78);
      box-shadow: var(--shadow-sm);
    }

    .category-tabs {
      display: flex;
      gap: 10px;
      padding: 18px;
      overflow-x: auto;
      border-bottom: 1px solid var(--color-border);
      scrollbar-width: thin;
    }

    .category-tab {
      flex: 0 0 auto;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 11px 15px;
      border: 1px solid var(--color-border);
      border-radius: 999px;
      color: var(--color-text);
      background: var(--color-white);
      font-weight: 800;
    }

    .category-tab:hover,
    .category-tab.active {
      color: var(--color-white);
      border-color: var(--color-primary);
      background: var(--color-primary);
      box-shadow: 0 12px 24px rgba(24, 102, 227, .20);
    }

    .category-content {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 1px;
      background: var(--color-border);
    }

    .category-card {
      padding: 24px;
      background: rgba(255, 255, 255, .90);
    }

    .category-card strong {
      display: block;
      color: var(--color-ink);
      font-size: 20px;
      margin-bottom: 10px;
    }

    .category-card p {
      margin: 0 0 16px;
      color: var(--color-muted);
    }

    .category-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .highlight-wall {
      display: grid;
      grid-template-columns: 1.05fr .95fr;
      gap: 22px;
      align-items: stretch;
    }

    .feature-large {
      min-height: 420px;
      padding: 34px;
      border-radius: var(--radius-xl);
      color: var(--color-white);
      background:
        linear-gradient(135deg, rgba(10, 36, 75, .92), rgba(24, 102, 227, .84)),
        radial-gradient(circle at 72% 26%, rgba(255, 180, 76, .42), transparent 34%);
      box-shadow: var(--shadow-lg);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-large h3 {
      margin: 0;
      max-width: 560px;
      color: var(--color-white);
      font-size: clamp(28px, 4vw, 44px);
      line-height: 1.18;
      letter-spacing: -.04em;
      font-weight: 900;
    }

    .feature-large p {
      max-width: 600px;
      margin: 18px 0 0;
      color: rgba(255, 255, 255, .78);
      font-size: 17px;
    }

    .feature-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 26px;
    }

    .feature-tags span {
      padding: 8px 12px;
      border-radius: 999px;
      background: rgba(255, 255, 255, .14);
      color: rgba(255, 255, 255, .92);
      font-weight: 800;
      font-size: 13px;
    }

    .highlight-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px;
    }

    .mini-feature {
      min-height: 200px;
      padding: 22px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, .88);
      box-shadow: var(--shadow-sm);
    }

    .mini-feature .num {
      display: inline-grid;
      place-items: center;
      width: 36px;
      height: 36px;
      margin-bottom: 18px;
      border-radius: 13px;
      color: var(--color-primary);
      background: var(--color-primary-soft);
      font-weight: 900;
    }

    .mini-feature h3 {
      margin: 0 0 9px;
      color: var(--color-ink);
      font-size: 20px;
      font-weight: 850;
    }

    .mini-feature p {
      margin: 0;
      color: var(--color-muted);
    }

    .trust-panel {
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 26px;
      align-items: center;
      padding: clamp(26px, 5vw, 46px);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-xl);
      background:
        linear-gradient(135deg, rgba(255, 255, 255, .92), rgba(246, 249, 255, .92));
      box-shadow: var(--shadow-md);
    }

    .trust-copy h2 {
      margin: 0;
      color: var(--color-ink);
      font-size: clamp(28px, 4vw, 44px);
      line-height: 1.18;
      letter-spacing: -.04em;
      font-weight: 900;
    }

    .trust-copy p {
      margin: 16px 0 0;
      color: var(--color-muted);
      font-size: 17px;
    }

    .trust-list {
      display: grid;
      gap: 14px;
      margin-top: 24px;
    }

    .trust-line {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      padding: 14px;
      border-radius: 18px;
      background: var(--color-white);
      border: 1px solid var(--color-border);
    }

    .trust-line i {
      width: 34px;
      height: 34px;
      display: grid;
      place-items: center;
      flex: 0 0 auto;
      border-radius: 12px;
      color: var(--color-success);
      background: #e6fbf3;
    }

    .brand-wall {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
    }

    .brand-tile {
      min-height: 112px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 8px;
      padding: 18px;
      border: 1px solid var(--color-border);
      border-radius: 22px;
      background: var(--color-white);
      box-shadow: 0 10px 24px rgba(18, 62, 118, .06);
    }

    .brand-tile i {
      color: var(--color-primary);
      font-size: 20px;
    }

    .brand-tile strong {
      color: var(--color-ink);
      line-height: 1.25;
    }

    .news-layout {
      display: grid;
      grid-template-columns: 1fr 360px;
      gap: 24px;
      align-items: start;
    }

    .news-list {
      border: 1px solid var(--color-border);
      border-radius: var(--radius-xl);
      background: rgba(255, 255, 255, .88);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }

    .news-item {
      display: grid;
      grid-template-columns: 108px 1fr auto;
      gap: 18px;
      align-items: center;
      padding: 22px;
      border-bottom: 1px solid var(--color-border);
    }

    .news-item:last-child {
      border-bottom: 0;
    }

    .news-date {
      color: var(--color-muted);
      font-size: 13px;
      font-weight: 800;
    }

    .news-item a {
      display: inline-block;
      color: var(--color-ink);
      font-size: 19px;
      font-weight: 850;
      line-height: 1.35;
    }

    .news-item a:hover {
      color: var(--color-primary);
    }

    .news-item p {
      margin: 7px 0 0;
      color: var(--color-muted);
      line-height: 1.6;
    }

    .news-arrow {
      width: 38px;
      height: 38px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      color: var(--color-primary);
      background: var(--color-primary-soft);
    }

    .recommend-box {
      padding: 24px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-xl);
      background: linear-gradient(180deg, #ffffff, #f4f8ff);
      box-shadow: var(--shadow-sm);
    }

    .recommend-box h3 {
      margin: 0 0 14px;
      color: var(--color-ink);
      font-size: 22px;
      font-weight: 900;
    }

    .rank-list {
      display: grid;
      gap: 12px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .rank-list li {
      display: grid;
      grid-template-columns: 34px 1fr;
      gap: 12px;
      align-items: start;
      padding: 12px;
      border-radius: 17px;
      background: var(--color-white);
      border: 1px solid var(--color-border);
    }

    .rank-list b {
      width: 34px;
      height: 34px;
      display: grid;
      place-items: center;
      border-radius: 12px;
      color: var(--color-primary);
      background: var(--color-primary-soft);
      font-size: 14px;
    }

    .rank-list strong {
      display: block;
      color: var(--color-ink);
      line-height: 1.35;
    }

    .rank-list span {
      display: block;
      margin-top: 4px;
      color: var(--color-muted);
      font-size: 13px;
      line-height: 1.5;
    }

    .faq-wrap {
      display: grid;
      grid-template-columns: 360px 1fr;
      gap: 26px;
      align-items: start;
    }

    .faq-side {
      padding: 26px;
      border-radius: var(--radius-xl);
      color: var(--color-white);
      background:
        linear-gradient(135deg, #102033, #155bc5),
        radial-gradient(circle at 75% 20%, rgba(16, 182, 209, .48), transparent 34%);
      box-shadow: var(--shadow-lg);
    }

    .faq-side h2 {
      margin: 0;
      color: var(--color-white);
      font-size: 32px;
      line-height: 1.2;
      letter-spacing: -.03em;
      font-weight: 900;
    }

    .faq-side p {
      margin: 14px 0 22px;
      color: rgba(255, 255, 255, .76);
    }

    .faq-list {
      display: grid;
      gap: 14px;
    }

    .faq-item {
      border: 1px solid var(--color-border);
      border-radius: 22px;
      background: rgba(255, 255, 255, .90);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      padding: 20px 22px;
      color: var(--color-ink);
      background: transparent;
      text-align: left;
      font-size: 18px;
      font-weight: 900;
    }

    .faq-question i {
      color: var(--color-primary);
      transition: transform var(--transition);
    }

    .faq-item.active .faq-question i {
      transform: rotate(180deg);
    }

    .faq-answer {
      display: none;
      padding: 0 22px 22px;
      color: var(--color-muted);
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-answer p {
      margin: 0;
    }

    .cta-card {
      margin-top: 18px;
      padding: 22px;
      border-radius: 24px;
      background: linear-gradient(135deg, rgba(24, 102, 227, .10), rgba(16, 182, 209, .12));
      border: 1px solid rgba(24, 102, 227, .18);
    }

    .cta-card strong {
      display: block;
      color: var(--color-ink);
      font-size: 20px;
      margin-bottom: 8px;
    }

    .subscribe-form {
      display: flex;
      gap: 10px;
      margin-top: 16px;
      padding: 8px;
      border: 1px solid var(--color-border);
      border-radius: 18px;
      background: var(--color-white);
    }

    .subscribe-form input {
      flex: 1;
      border: 0;
      outline: none;
      padding: 0 10px;
      color: var(--color-ink);
      background: transparent;
    }

    .subscribe-form button {
      flex: 0 0 auto;
    }

    .site-footer {
      padding: 56px 0 30px;
      color: rgba(255, 255, 255, .74);
      background: #0d1a2b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.1fr .9fr;
      gap: 36px;
      align-items: start;
      padding-bottom: 30px;
      border-bottom: 1px solid rgba(255, 255, 255, .10);
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      color: var(--color-white);
      font-size: 20px;
      font-weight: 900;
      letter-spacing: -.03em;
    }

    .footer-brand .brand-mark {
      box-shadow: none;
    }

    .footer-text {
      max-width: 620px;
      margin: 16px 0 0;
      color: rgba(255, 255, 255, .66);
    }

    .footer-note {
      display: grid;
      gap: 12px;
    }

    .footer-note h3 {
      margin: 0;
      color: var(--color-white);
      font-size: 18px;
      font-weight: 850;
    }

    .footer-note p {
      margin: 0;
      color: rgba(255, 255, 255, .66);
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
      padding-top: 22px;
      font-size: 14px;
      color: rgba(255, 255, 255, .58);
    }

    .back-top {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: rgba(255, 255, 255, .78);
      font-weight: 800;
    }

    .back-top:hover {
      color: var(--color-white);
    }

    @media (max-width: 1024px) {
      :root {
        --nav-height: auto;
      }

      .main-nav {
        flex-wrap: wrap;
      }

      .nav-center {
        order: 3;
        width: 100%;
        justify-content: center;
      }

      .nav-search {
        width: 220px;
      }

      .hero-top,
      .app-grid,
      .service-layout,
      .trust-panel,
      .highlight-wall,
      .news-layout,
      .faq-wrap {
        grid-template-columns: 1fr;
      }

      .hero-copy,
      .hero-demo {
        min-height: auto;
      }

      .service-aside {
        position: relative;
        top: auto;
      }

      .brand-wall,
      .category-content {
        grid-template-columns: repeat(2, 1fr);
      }

      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .container {
        width: min(calc(100% - 28px), var(--container));
      }

      .section {
        padding: 68px 0;
      }

      .site-header {
        padding-top: 12px;
      }

      .main-nav {
        padding: 12px;
      }

      .brand-sub {
        display: none;
      }

      .menu-toggle {
        display: inline-grid;
        place-items: center;
      }

      .nav-center,
      .nav-actions {
        display: none;
        width: 100%;
      }

      .nav-shell.open .nav-center,
      .nav-shell.open .nav-actions {
        display: flex;
      }

      .nav-shell.open .nav-actions {
        flex-direction: column;
        align-items: stretch;
      }

      .nav-search {
        width: 100%;
      }

      .nav-actions .btn {
        width: 100%;
      }

      .hero {
        padding-top: 34px;
      }

      .hero-top {
        padding: 24px;
      }

      .hero-bottom {
        grid-template-columns: repeat(2, 1fr);
      }

      .demo-status,
      .service-cards,
      .highlight-grid,
      .brand-wall,
      .category-content {
        grid-template-columns: 1fr;
      }

      .sync-board {
        grid-template-columns: 1fr;
      }

      .sync-card:nth-child(3) {
        grid-column: auto;
      }

      .news-item {
        grid-template-columns: 1fr;
        gap: 8px;
      }

      .news-arrow {
        display: none;
      }

      .subscribe-form {
        flex-direction: column;
      }

      .subscribe-form input {
        min-height: 44px;
      }

      .subscribe-form .btn {
        width: 100%;
      }
    }

    @media (max-width: 520px) {
      body {
        font-size: 15px;
      }

      .nav-shell {
        width: calc(100% - 20px);
        border-radius: 22px;
      }

      .brand-title {
        font-size: 15px;
      }

      .brand-mark {
        width: 36px;
        height: 36px;
        border-radius: 13px;
      }

      .hero h1 {
        font-size: 36px;
      }

      .hero-actions,
      .app-actions {
        flex-direction: column;
      }

      .hero-actions .btn,
      .app-actions .btn {
        width: 100%;
      }

      .hero-bottom {
        grid-template-columns: 1fr;
      }

      .demo-searchbar {
        flex-direction: column;
      }

      .demo-searchbar .mini-btn {
        min-height: 42px;
      }

      .demo-row {
        grid-template-columns: 34px 1fr;
      }

      .demo-row .badge {
        grid-column: 1 / -1;
        justify-content: center;
      }

      .feature-large {
        min-height: 360px;
        padding: 24px;
      }

      .faq-question {
        font-size: 16px;
      }

      .footer-bottom {
        flex-direction: column;
      }
    }