/* roulang page: index */
:root {
      --primary: #0A6EFF;
      --primary-hover: #0855CC;
      --accent-gold: #F5A623;
      --accent-gold-hover: #E59400;
      --silver-bg: #F0F3F8;
      --light-blue-bg: #F8FAFD;
      --text-main: #1F2937;
      --text-secondary: #4B5563;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --card-shadow: 0 4px 20px rgba(10,110,255,0.06);
      --card-shadow-hover: 0 8px 30px rgba(10,110,255,0.12);
      --radius-card: 16px;
      --radius-btn: 10px;
      --transition: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
      margin: 0;
      background-color: #FFFFFF;
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 导航 SaaS 命令栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 4rem;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 50;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    .logo small {
      font-size: 0.75rem;
      font-weight: 400;
      color: var(--text-muted);
      letter-spacing: 0.2px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: #374151;
      text-decoration: none;
      position: relative;
      padding: 0.25rem 0;
      transition: color var(--transition);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .search-box {
      display: flex;
      align-items: center;
      background: #f3f4f6;
      border-radius: 2rem;
      padding: 0.4rem 1rem;
      gap: 0.5rem;
      color: var(--text-muted);
      font-size: 0.9rem;
      border: 1px solid transparent;
      transition: all var(--transition);
    }
    .search-box i {
      font-size: 0.9rem;
    }
    .search-box span {
      color: #9CA3AF;
      font-size: 0.75rem;
      background: #e5e7eb;
      padding: 0.1rem 0.4rem;
      border-radius: 4px;
      margin-left: 0.5rem;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
      transition: background var(--transition);
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: rgba(10,110,255,0.04);
    }
    .btn-gold {
      background: var(--accent-gold);
      color: #1F2937;
      border: none;
      padding: 0.8rem 2.5rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: background var(--transition);
      box-shadow: 0 4px 10px rgba(245,166,35,0.25);
    }
    .btn-gold:hover {
      background: var(--accent-gold-hover);
    }

    /* 移动端菜单按钮 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--text-main);
    }

    /* 区块标题 */
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      letter-spacing: -0.3px;
      margin-bottom: 0.75rem;
    }
    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-secondary);
      max-width: 700px;
      margin: 0 auto 2.5rem;
    }

    /* 卡片规范 */
    .card {
      background: #fff;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: all var(--transition);
      height: 100%;
    }
    .card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }

    /* 案例瀑布 */
    .case-card img {
      border-radius: 12px 12px 0 0;
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: filter var(--transition);
    }
    .case-card:hover img {
      filter: saturate(1.3);
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      padding: 1.2rem 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color var(--transition);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-secondary);
      padding-left: 0.5rem;
    }
    .faq-item.active .faq-question {
      color: var(--primary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }

    /* 底部悬浮CTA */
    .mobile-cta-bar {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: white;
      padding: 0.8rem 1.5rem;
      box-shadow: 0 -4px 15px rgba(0,0,0,0.05);
      z-index: 60;
    }

    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
      .nav-links, .search-box, .nav-actions .btn-primary {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .mobile-menu {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: 4rem;
        left: 0;
        width: 100%;
        padding: 1rem 1.5rem;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .mobile-menu.active {
        display: flex;
      }
      .hero-container {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        width: 100% !important;
      }
      .hero-right {
        height: 280px;
        margin-top: 2rem;
      }
      .section-title {
        font-size: 1.8rem;
      }
      .grid-cols-2 {
        grid-template-columns: repeat(2,1fr);
      }
      .md-grid-3 {
        grid-template-columns: repeat(2,1fr);
      }
      .compare-columns {
        flex-direction: column;
      }
      .mobile-cta-bar {
        display: flex;
        justify-content: center;
      }
      footer .footer-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    @media (max-width: 520px) {
      .grid-cols-2, .md-grid-3 {
        grid-template-columns: 1fr;
      }
    }