/* roulang page: index */
:root {
      --primary: #E84830;
      --primary-hover: #C0392B;
      --primary-soft: #FDEDEA;
      --secondary: #1E2A38;
      --accent: #00B074;
      --accent-hover: #008F5E;
      --bg-warm: #F5F0E8;
      --bg-light: #FFFFFF;
      --text-dark: #2C3A4B;
      --text-muted: #6F7D8C;
      --border-light: #E2E6EA;
      --card-shadow: 0 4px 12px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-sans: system-ui, 'PingFang SC', 'Microsoft YaHei', '黑体', 'Helvetica Neue', sans-serif;
      --font-mono: 'SF Mono', 'Cascadia Code', 'Menlo', monospace;
      --transition: 0.2s ease;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(245, 240, 232, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      z-index: 100;
      height: 64px;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: baseline;
      gap: 8px;
      text-decoration: none;
      color: var(--secondary);
    }

    .logo-text {
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 1px;
      color: var(--secondary);
      line-height: 1.2;
    }

    .logo-domain {
      font-size: 0.75rem;
      color: var(--text-muted);
      font-weight: 400;
      opacity: 0.85;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-dark);
      padding: 8px 0;
      border-bottom: 3px solid transparent;
      transition: border-color var(--transition), color var(--transition);
    }

    .nav-links a:hover,
    .nav-links a.active {
      border-bottom-color: var(--primary);
      color: var(--primary);
    }

    .mobile-nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--secondary);
      cursor: pointer;
    }

    /* 移动端导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: #FFFFFF;
      box-shadow: 0 -4px 12px rgba(0,0,0,0.06);
      justify-content: space-around;
      padding: 12px 0 18px;
      z-index: 99;
      border-top: 1px solid var(--border-light);
    }

    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-decoration: none;
      font-size: 0.7rem;
      color: var(--text-muted);
      gap: 4px;
      font-weight: 500;
    }

    .mobile-bottom-nav a i {
      font-size: 1.4rem;
      color: var(--text-dark);
    }

    .mobile-bottom-nav a.active {
      color: var(--primary);
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
      scroll-margin-top: 80px;
    }

    h1, h2, h3 {
      font-weight: 700;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 44px;
      line-height: 1.2;
    }

    h2 {
      font-size: 32px;
      margin-bottom: 18px;
    }

    h3 {
      font-size: 20px;
      font-weight: 600;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all var(--transition);
      cursor: pointer;
      border: none;
      font-size: 1rem;
    }

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

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 14px rgba(232,72,48,0.3);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary-soft);
    }

    .btn-accent {
      background: var(--accent);
      color: white;
      font-weight: 700;
    }

    .btn-accent:hover {
      background: var(--accent-hover);
    }

    .card {
      background: #FFFFFF;
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

    .card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }

    /* Hero */
    #hero {
      background: var(--secondary);
      background-image: radial-gradient(circle at 30% 20%, rgba(232,72,48,0.15), transparent 60%), url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      padding: 140px 0 100px;
      color: white;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 45px;
      align-items: center;
    }

    .hero-left h1 {
      font-size: 48px;
      color: white;
      margin-bottom: 22px;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 35px;
    }

    .hero-stats {
      display: flex;
      gap: 32px;
      margin-top: 30px;
      flex-wrap: wrap;
    }

    .stat-item {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(5px);
      border-radius: 16px;
      padding: 18px 22px;
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.4rem;
      font-weight: 800;
      color: #00B074;
    }

    .hero-right .live-demo {
      background: rgba(255,255,255,0.05);
      border-radius: 24px;
      padding: 30px;
      display: flex;
      flex-direction: column;
      gap: 15px;
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .metric-card {
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(8px);
      border-radius: 20px;
      padding: 24px 18px;
      color: white;
      box-shadow: 0 4px 18px rgba(255,255,255,0.06);
    }

    .metric-card .metric-value {
      font-size: 2.2rem;
      font-weight: 800;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-image {
      width: 100%;
      aspect-ratio: 16/9;
      background-color: #E2E6EA;
      border-radius: 10px;
      overflow: hidden;
      margin-bottom: 15px;
    }

    .service-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 24px;
      align-items: center;
    }

    .vs-badge {
      font-weight: 800;
      font-size: 1.8rem;
      background: white;
      border-radius: 50%;
      width: 64px;
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 18px rgba(0,0,0,0.1);
    }

    .faq-item {
      background: #FFFFFF;
      border-radius: 12px;
      margin-bottom: 14px;
      overflow: hidden;
      transition: all 0.3s;
    }

    .faq-question {
      padding: 22px 25px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      background: #EDE8E0;
      padding: 0 25px;
      transition: max-height 0.2s ease;
    }

    .faq-item.active .faq-answer {
      max-height: 202px;
      padding: 15px 25px;
    }

    footer {
      background: var(--secondary);
      color: rgba(255,255,255,0.75);
      text-align: center;
      padding: 35px 0;
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .site-header .nav-links { display: none; }
      .mobile-bottom-nav { display: flex; }
      h1 { font-size: 32px; }
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: 1fr; }
      .compare-wrapper { grid-template-columns: 1fr; }
      .vs-badge { margin: 15px auto; }
_boolan_.toggle用法移除仅占位
    }