/* roulang page: index */
:root {
      --primary: #0D47A1;
      --primary-hover: #0a3880;
      --secondary: #0288D1;
      --accent: #00B4D8;
      --bg-main: #FFFFFF;
      --bg-alt: #F8FAFC;
      --bg-dark: #0B1325;
      --bg-dark-card: #142342;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --border-color: #E2E8F0;
      --border-dark: #1E293B;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 6px 20px -2px rgba(13, 71, 161, 0.06);
      --shadow-lg: 0 16px 36px -6px rgba(13, 71, 161, 0.12);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --transition: all 0.25s ease-in-out;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-main);
      line-height: 1.75;
      letter-spacing: 0.01em;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    .section-py {
      padding-top: 96px;
      padding-bottom: 96px;
    }

    @media (max-width: 768px) {
      .section-py {
        padding-top: 56px;
        padding-bottom: 56px;
      }
    }

    /* 顶部收缩双层导航体系 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1050;
      background: rgba(255, 255, 255, 0.98);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }

    .nav-top-bar {
      height: 40px;
      background-color: #F1F5F9;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.85rem;
      color: var(--text-muted);
      transition: height 0.3s ease, opacity 0.3s ease;
      overflow: hidden;
    }

    .nav-top-bar.collapsed {
      height: 0;
      opacity: 0;
      border-bottom: none;
    }

    .nav-main-bar {
      height: 72px;
      transition: height 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      align-items: center;
    }

    .site-header.scrolled {
      box-shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
      backdrop-filter: blur(10px);
    }

    .site-header.scrolled .nav-main-bar {
      height: 64px;
    }

    .brand-logo {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 10px;
      letter-spacing: -0.02em;
    }

    .brand-logo i {
      color: var(--secondary);
      font-size: 1.5rem;
    }

    .nav-links-desktop {
      display: flex;
      gap: 24px;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-links-desktop a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-muted);
    }

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

    /* 按钮重置与定制 */
    .btn-brand-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #fff;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      border: none;
      box-shadow: 0 4px 14px rgba(13, 71, 161, 0.25);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .btn-brand-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary) 100%);
      color: #fff;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(13, 71, 161, 0.35);
    }

    .btn-brand-outline {
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .btn-brand-outline:hover {
      background-color: rgba(13, 71, 161, 0.05);
      color: var(--primary-hover);
      border-color: var(--primary-hover);
      transform: translateY(-2px);
    }

    /* 卡片通用系统 */
    .custom-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
      overflow: hidden;
    }

    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(13, 71, 161, 0.25);
    }

    .card-dark {
      background-color: var(--bg-dark-card);
      border: 1px solid var(--border-dark);
      color: #FFFFFF;
    }

    .card-dark:hover {
      border-color: var(--accent);
      box-shadow: 0 10px 30px rgba(0, 180, 216, 0.15);
    }

    /* 标题系统 */
    .section-eyebrow {
      color: var(--secondary);
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      margin-bottom: 8px;
      display: inline-block;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 780px;
      margin-bottom: 0;
    }

    /* 首屏 Hero */
    .hero-section {
      padding-top: 170px;
      padding-bottom: 96px;
      background: radial-gradient(circle at 85% 15%, rgba(2, 136, 209, 0.08) 0%, rgba(255, 255, 255, 0) 65%), #FFFFFF;
      position: relative;
    }

    .hero-bg-visual {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .hero-badge-pill {
      background: rgba(13, 71, 161, 0.08);
      color: var(--primary);
      padding: 6px 14px;
      border-radius: 50px;
      font-size: 0.85rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-bottom: 20px;
    }

    /* 指标计数区 */
    .metric-value {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
    }

    /* 对比表格面板 */
    .comparison-table-wrapper {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      overflow-x: auto;
    }

    .comparison-table {
      width: 100%;
      border-collapse: separate;
      border-spacing: 0;
      min-width: 650px;
    }

    .comparison-table th,
    .comparison-table td {
      padding: 18px 24px;
      text-align: left;
      border-bottom: 1px solid var(--border-color);
    }

    .comparison-table th {
      background-color: var(--bg-alt);
      font-weight: 700;
      color: var(--text-main);
    }

    .comparison-table tr:last-child td {
      border-bottom: none;
    }

    .col-highlight {
      background-color: rgba(2, 136, 209, 0.04);
      font-weight: 600;
      color: var(--primary);
    }

    /* 流程时间线组件 */
    .step-badge {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.1rem;
      margin-bottom: 16px;
    }

    /* 折叠面板 Accordion 定制 */
    .custom-accordion .accordion-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm) !important;
      margin-bottom: 12px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .custom-accordion .accordion-button {
      font-weight: 700;
      color: var(--text-main);
      padding: 18px 20px;
      background: #FFFFFF;
    }

    .custom-accordion .accordion-button:not(.collapsed) {
      color: var(--primary);
      background-color: rgba(13, 71, 161, 0.03);
      box-shadow: none;
    }

    .custom-accordion .accordion-button:focus {
      box-shadow: none;
      border-color: rgba(13, 71, 161, 0.2);
    }

    .custom-accordion .accordion-body {
      padding: 20px;
      color: var(--text-muted);
      line-height: 1.8;
      background-color: #FFFFFF;
    }

    /* 底部固定转化条 */
    .bottom-sticky-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(15, 23, 42, 0.95);
      backdrop-filter: blur(10px);
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding: 12px 0;
      z-index: 1040;
      transform: translateY(100%);
      transition: transform 0.3s ease;
    }

    .bottom-sticky-bar.visible {
      transform: translateY(0);
    }

    /* 页脚设计 */
    .site-footer {
      background-color: var(--bg-dark);
      color: var(--text-light);
      padding-top: 80px;
      padding-bottom: 40px;
      border-top: 1px solid var(--border-dark);
      font-size: 0.92rem;
    }

    .site-footer h5 {
      color: #FFFFFF;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .footer-links {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a:hover {
      color: #FFFFFF;
      padding-left: 4px;
    }

    .footer-bottom {
      margin-top: 60px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.85rem;
    }