/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-dark: #154E64;
      --secondary: #F4A261;
      --accent-gold: #E9C46A;
      --bg-warm: #FAF9F6;
      --text-main: #1E293B;
      --text-secondary: #475569;
      --text-light: #64748B;
      --white: #FFFFFF;
      --card-bg: #FFFFFF;
      --border-light: #E2E8F0;
      --shadow-card: 0 2px 12px rgba(26, 95, 122, 0.06);
      --shadow-hover: 0 8px 24px rgba(26, 95, 122, 0.12), 0 2px 4px rgba(0,0,0,0.02);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --transition: 0.25s ease;
      --font-heading: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-body: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-number: 'Inter', 'Noto Sans SC', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: all var(--transition);
      cursor: pointer;
      border: none;
      font-size: 1rem;
      padding: 12px 28px;
      line-height: 1.4;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 10px rgba(26, 95, 122, 0.2);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(26, 95, 122, 0.28);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: rgba(26, 95, 122, 0.05);
    }
    .btn-secondary {
      background: white;
      color: var(--primary);
      border: 1px solid var(--border-light);
    }
    .btn-secondary:hover {
      background: #f1f5f9;
      border-color: var(--primary);
    }
    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(10px);
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
      transition: all 0.3s ease;
    }
    .site-header.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      border-bottom-color: var(--border-light);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: baseline;
      gap: 12px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .logo span.domain {
      font-size: 0.8rem;
      font-weight: 400;
      color: var(--text-light);
      letter-spacing: 0.2px;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      font-weight: 500;
      color: var(--text-secondary);
    }
    .nav-links a {
      transition: color 0.2s;
      font-size: 0.98rem;
      position: relative;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 24px;
      }
      .nav-desktop {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .header-cta-desktop {
        display: none;
      }
    }
    /* hero */
    .hero {
      display: flex;
      align-items: center;
      gap: 60px;
      padding: 60px 0 80px;
    }
    .hero-left {
      flex: 5;
    }
    .hero-right {
      flex: 7;
      position: relative;
    }
    .hero-right img {
      border-radius: 24px;
      object-fit: cover;
      width: 100%;
      height: auto;
      box-shadow: 0 20px 35px rgba(0,0,0,0.1);
    }
    .hero h1 {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.25;
      margin-bottom: 20px;
      color: var(--text-main);
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 30px;
    }
    .trust-badges {
      display: flex;
      gap: 24px;
      margin-top: 32px;
      font-size: 0.9rem;
      color: var(--text-light);
    }
    .trust-badges i {
      color: var(--secondary);
      margin-right: 6px;
    }
    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        gap: 40px;
      }
      .hero h1 {
        font-size: 36px;
      }
    }
    /* 板块 */
    .section {
      padding: 70px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .section-desc {
      color: var(--text-secondary);
      max-width: 700px;
      margin-bottom: 40px;
      font-size: 1.1rem;
    }
    /* 亮点网格 */
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: all var(--transition);
      text-align: left;
    }
    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: var(--secondary);
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--secondary);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }
    /* 瀑布流案例 */
    .masonry {
      display: columns;
      column-count: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
    }
    .masonry-item:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .masonry-item img {
      width: 100%;
      object-fit: cover;
      transition: 0.3s;
    }
    .masonry-item:hover img {
      transform: scale(1.03);
    }
    .masonry-text {
      padding: 20px;
    }
    .tag {
      background: #f1f5f9;
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
      display: inline-block;
      margin-bottom: 8px;
    }
    /* 对比表 */
    .compare-table {
      display: flex;
      gap: 24px;
      margin-top: 20px;
    }
    .compare-col {
      flex: 1;
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      border: 1px solid var(--border-light);
    }
    .compare-col.recommend {
      background: #f0f7fa;
      border-color: var(--primary);
      position: relative;
    }
    .badge {
      background: var(--secondary);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
    }
    /* faq */
    .faq-grid {
      display: flex;
      gap: 50px;
    }
    .faq-left {
      flex: 1;
    }
    .faq-right {
      flex: 1.5;
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }
    .accordion-title {
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    /* cta */
    .cta-full {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      border-radius: 24px;
      padding: 70px 40px;
      text-align: center;
      color: white;
    }
    .footer {
      background: #1E293B;
      color: #cbd5e1;
      padding: 50px 0 20px;
    }
    @media (max-width: 768px) {
      .grid-3x2, .compare-table, .faq-grid {
        grid-template-columns: 1fr;
        flex-direction: column;
      }
      .masonry {
        column-count: 2;
      }
    }
    @media (max-width: 520px) {
      .masonry {
        column-count: 1;
      }
      .hero h1 {
        font-size: 32px;
      }
    }