/* roulang page: index */
:root {
      --primary: #1d4ed8;
      --primary-light: #3b82f6;
      --primary-dark: #1e40af;
      --primary-subtle: #eff6ff;
      --accent: #0284c7;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --bg-white: #ffffff;
      --bg-alt: #f8fafc;
      --border: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
      --radius: 12px;
      --radius-sm: 6px;
      --transition: all 0.25s ease-in-out;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      color: var(--text-main);
      background-color: var(--bg-alt);
      line-height: 1.6;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover, a:focus {
      color: var(--primary-dark);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius);
    }

    /* 顶部导航 */
    .site-header {
      background: var(--bg-white);
      border-bottom: 1px solid var(--border);
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0.9rem 1rem;
      max-width: 1200px;
      margin: 0 auto;
    }
    .brand-logo {
      font-size: 1.45rem;
      font-weight: 800;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 0.4rem;
    }
    .brand-logo span {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .nav-actions .btn-login {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary);
      padding: 0.45rem 1.1rem;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      background: var(--bg-white);
    }
    .nav-actions .btn-login:hover {
      background: var(--primary-subtle);
      border-color: var(--primary-light);
    }

    /* 现代 Section 规范 */
    .content-section {
      padding: 4.5rem 1rem;
      position: relative;
    }
    .content-section.bg-white {
      background-color: var(--bg-white);
    }
    .content-section.bg-alt {
      background-color: var(--bg-alt);
    }
    .content-section.border-top {
      border-top: 1px solid var(--border);
    }
    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 3rem auto;
    }
    .section-header h2 {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 0.75rem;
    }
    .section-header p {
      color: var(--text-muted);
      font-size: 1.05rem;
      line-height: 1.7;
      margin: 0;
    }

    /* 卡片系统 */
    .custom-card {
      background: var(--bg-white);
      border-radius: var(--radius);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      padding: 1.75rem;
      transition: var(--transition);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
    }
    .card-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 0.2rem 0.6rem;
      border-radius: 9999px;
      margin-bottom: 1rem;
      background: var(--primary-subtle);
      color: var(--primary);
      width: fit-content;
    }

    /* 按钮规范 */
    .btn-solid {
      display: inline-block;
      background: var(--primary);
      color: #fff;
      font-weight: 600;
      padding: 0.8rem 1.6rem;
      border-radius: var(--radius-sm);
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 10px rgba(29, 78, 216, 0.25);
    }
    .btn-solid:hover {
      background: var(--primary-dark);
      color: #fff;
      box-shadow: 0 6px 14px rgba(29, 78, 216, 0.35);
    }
    .btn-outline {
      display: inline-block;
      background: transparent;
      color: var(--primary);
      font-weight: 600;
      padding: 0.8rem 1.6rem;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border);
    }
    .btn-outline:hover {
      background: var(--primary-subtle);
      border-color: var(--primary);
    }

    /* Hero：蓝图与自媒体口吻 */
    .hero-wrapper {
      background: linear-gradient(to bottom, #ffffff, #eff6ff);
      padding: 5rem 1rem 4rem 1rem;
      border-bottom: 1px solid var(--border);
    }
    .hero-container {
      max-width: 1200px;
      margin: 0 auto;
    }
    .hero-tag {
      display: inline-block;
      background: #dbeafe;
      color: var(--primary);
      padding: 0.3rem 0.8rem;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    .hero-wrapper h1 {
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 1.25rem;
      letter-spacing: -0.02em;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: #475569;
      line-height: 1.8;
      margin-bottom: 2rem;
    }
    .hero-card-side {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-lg);
      padding: 2rem;
    }

    /* 权益对比表格 */
    .pricing-table-custom {
      width: 100%;
      border-collapse: separate;
      border-spacing: 0;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border);
      background: var(--bg-white);
    }
    .pricing-table-custom th, .pricing-table-custom td {
      padding: 1.1rem 1.25rem;
      text-align: left;
      border-bottom: 1px solid var(--border);
    }
    .pricing-table-custom th {
      background: #f1f5f9;
      color: var(--text-main);
      font-weight: 700;
    }
    .pricing-table-custom tr:last-child td {
      border-bottom: none;
    }

    /* 误区与指南对比 */
    .mis-box {
      border-left: 4px solid #ef4444;
      background: #fef2f2;
      padding: 1rem 1.25rem;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      margin-bottom: 1rem;
    }
    .cor-box {
      border-left: 4px solid #10b981;
      background: #ecfdf5;
      padding: 1rem 1.25rem;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    }

    /* 底部保障条 */
    .trust-bar {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      gap: 1.5rem;
      padding: 2.5rem 1rem;
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
    }
    .trust-item {
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }
    .trust-icon {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-subtle);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 1.2rem;
    }

    /* 响应式调整 */
    @media (max-width: 768px) {
      .hero-wrapper h1 {
        font-size: 2rem;
      }
      .content-section {
        padding: 3rem 1rem;
      }
      .trust-bar {
        flex-direction: column;
      }
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 4rem 1rem 2rem 1rem;
      font-size: 0.95rem;
    }
    .site-footer h4 {
      color: #ffffff;
      font-size: 1.1rem;
      margin-bottom: 1.25rem;
      font-weight: 700;
    }
    .site-footer ul {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .site-footer li {
      margin-bottom: 0.6rem;
    }
    .site-footer a {
      color: #94a3b8;
    }
    .site-footer a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      margin-top: 3rem;
      padding-top: 1.5rem;
      border-top: 1px solid #1e293b;
      text-align: center;
      font-size: 0.85rem;
    }