/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-dark: #0F3B4F;
      --accent: #C49B4A;
      --accent-hover: #B0893C;
      --bg-light: #E8F0F3;
      --bg-page: #F7F9FA;
      --white: #FFFFFF;
      --text-main: #2C3E4A;
      --text-secondary: #5A6E79;
      --text-muted: #7A8D97;
      --border: #DDE5E9;
      --shadow-sm: 0 2px 12px rgba(15, 59, 79, 0.06);
      --shadow-md: 0 8px 28px rgba(15, 59, 79, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 16px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
      --font-number: "Inter", "Segoe UI", system-ui, sans-serif;
      --transition: 0.25s ease;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    button, input, textarea {
      font-family: inherit;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 顶部导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--white);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      height: 72px;
      display: flex;
      align-items: center;
    }
    
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    
    .logo a {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: 0.02em;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 28px;
      color: var(--accent);
    }
    
    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    
    .desktop-nav a {
      font-size: 15px;
      color: var(--text-secondary);
      font-weight: 500;
      position: relative;
      padding: 8px 0;
    }
    
    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: var(--primary);
    }
    
    .desktop-nav a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s;
    }
    
    .desktop-nav a:hover::after,
    .desktop-nav a.active::after {
      width: 100%;
    }
    
    .btn-primary {
      background: var(--accent);
      color: var(--white);
      font-weight: 600;
      letter-spacing: 0.03em;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background 0.2s, box-shadow 0.2s, transform 0.15s;
      box-shadow: 0 4px 10px rgba(196, 155, 74, 0.2);
    }
    
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 20px rgba(196, 155, 74, 0.3);
      transform: translateY(-2px);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s;
    }
    
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    
    .btn-text {
      color: var(--primary);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-text:hover {
      text-decoration: underline;
    }
    
    /* 移动端汉堡菜单与底部Tab */
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--primary-dark);
      cursor: pointer;
    }
    
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: var(--white);
      box-shadow: 0 -2px 12px rgba(0,0,0,0.04);
      height: 60px;
      z-index: 99;
      justify-content: space-around;
      align-items: center;
      padding: 0 10px;
    }
    
    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 10px;
      color: var(--text-muted);
      gap: 4px;
      transition: color 0.2s;
    }
    
    .mobile-bottom-nav a i {
      font-size: 20px;
    }
    
    .mobile-bottom-nav a.active {
      color: var(--primary);
    }
    
    /* 板块通用 */
    .section {
      padding: 120px 0;
    }
    .section-alt {
      background: var(--bg-light);
    }
    
    .section-title {
      font-size: 32px;
      font-weight: 600;
      color: var(--primary-dark);
      margin-bottom: 16px;
    }
    .section-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }
    
    /* Hero */
    .hero {
      background: linear-gradient(180deg, #FFFFFF 0%, #E8F0F3 100%);
      padding: 80px 0 100px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 44px;
      font-weight: 700;
      color: var(--primary-dark);
      line-height: 1.25;
      letter-spacing: 0.02em;
      margin-bottom: 20px;
    }
    .hero-content p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image img {
      border-radius: var(--radius-img);
      box-shadow: var(--shadow-md);
      width: 100%;
      object-fit: cover;
    }
    
    /* 核心优势 不对称布局 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 24px;
    }
    .adv-card-large, .adv-card-small {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .adv-card-large:hover, .adv-card-small:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .adv-right-stack {
      display: grid;
      grid-template-rows: 1fr 1fr;
      gap: 24px;
    }
    .adv-icon {
      width: 48px;
      height: 48px;
      background: var(--bg-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 22px;
      margin-bottom: 20px;
    }
    
    /* 业务分组交替图文 */
    .biz-row {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 80px;
    }
    .biz-row.reverse {
      grid-template-columns: 7fr 5fr;
    }
    .biz-img img {
      border-radius: var(--radius-card);
      width: 100%;
    }
    .biz-text h3 {
      font-size: 24px;
      margin-bottom: 16px;
    }
    .biz-list {
      list-style: none;
      margin: 20px 0;
    }
    .biz-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: flex-start;
      gap: 10px;
      color: var(--text-secondary);
    }
    .biz-list i {
      color: var(--accent);
      margin-top: 4px;
    }
    
    /* Tab 解决方案 */
    .tabs-nav {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 40px;
      border-bottom: 1px solid var(--border);
      padding-bottom: 12px;
    }
    .tab-btn {
      background: none;
      border: none;
      padding: 10px 20px;
      font-size: 16px;
      font-weight: 500;
      color: var(--text-secondary);
      cursor: pointer;
      border-bottom: 3px solid transparent;
      transition: 0.2s;
    }
    .tab-btn.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .tab-panel {
      display: none;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .tab-panel.active {
      display: grid;
    }
    
    /* 案例卡片 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }
    .case-card {
      flex: 0 0 calc(40% - 24px);
      min-width: 280px;
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 28px;
      scroll-snap-align: start;
      box-shadow: var(--shadow-sm);
    }
    .case-metric {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent);
      font-family: var(--font-number);
    }
    
    /* 价格卡片不对称 */
    .pricing-grid {
      display: grid;
      grid-template-columns: 1fr 1.3fr 1fr;
      gap: 24px;
      align-items: start;
    }
    .price-card {
      background: white;
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .price-card.featured {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: scale(1.02);
      position: relative;
    }
    .badge-recommend {
      background: var(--accent);
      color: white;
      font-size: 13px;
      padding: 4px 16px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 12px;
    }
    
    /* FAQ */
    .faq-group {
      margin-bottom: 40px;
    }
    .faq-item {
      background: var(--white);
      border-bottom: 1px solid var(--border);
    }
    .faq-question {
      padding: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
    }
    .faq-answer {
      padding: 0 20px 20px;
      display: none;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    
    /* CTA 尾屏 */
    .cta-footer {
      background: var(--bg-light);
    }
    .form-row {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .form-row input, .form-row textarea {
      flex: 1;
      padding: 14px 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-btn);
      background: white;
      transition: 0.2s;
    }
    .form-row input:focus, .form-row textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(26,95,122,0.1);
      outline: none;
    }
    
    /* 页脚 */
    .site-footer {
      background: var(--primary-dark);
      color: #BCC7CD;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 32px;
    }
    .footer-col h4 {
      color: white;
      margin-bottom: 20px;
      font-size: 16px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    
    @media (max-width: 1024px) {
      .hero-grid, .advantages-grid, .biz-row, .tab-panel.active {
        grid-template-columns: 1fr;
      }
      .pricing-grid {
        grid-template-columns: 1fr;
      }
      .price-card.featured {
        transform: none;
      }
      .footer-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      body {
        padding-bottom: 70px;
      }
      .section {
        padding: 80px 0;
      }
      .hero-content h1 {
        font-size: 32px;
      }
    }