/* roulang page: index */
:root {
      --primary: #0A4C7B;
      --secondary: #00A3E0;
      --accent: #FF6B35;
      --bg-light: #F4F7FA;
      --bg-card: #F8FAFC;
      --text-dark: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #7A7A7A;
      --border-light: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --transition: all 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: #fff;
      color: var(--text-body);
      line-height: 1.8;
      margin: 0;
      padding: 0;
    }
    h1, h2, h3, h4, h5, h6 {
      color: var(--text-dark);
      font-weight: 700;
      line-height: 1.4;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 自定义导航 */
    .navbar-custom {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: none;
      transition: var(--transition);
      border-bottom: 1px solid transparent;
      padding: 0;
    }
    .navbar-custom.scrolled {
      background: rgba(255,255,255,0.96);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 4px 20px rgba(0,0,0,0.02);
    }
    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 48px;
      padding: 0 20px;
    }
    .logo-text {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .logo-text span {
      color: var(--accent);
    }
    .hotline {
      font-size: 14px;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .search-icon {
      width: 20px;
      height: 20px;
      color: #4A4A4A;
      cursor: pointer;
      transition: var(--transition);
    }
    .search-icon:hover {
      color: var(--primary);
    }
    .channel-row {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      height: 44px;
      gap: 8px;
      padding: 0 20px;
    }
    .nav-link-custom {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-body);
      padding: 8px 12px;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
      letter-spacing: 0.8px;
    }
    .nav-link-custom:hover {
      color: var(--primary);
      border-bottom: 2px solid var(--primary);
    }
    .navbar-toggler {
      border: none;
      color: var(--primary);
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    @media (max-width: 768px) {
      .channel-row {
        flex-direction: column;
        align-items: flex-start;
        height: auto;
        padding: 12px 20px;
        background: white;
        gap: 4px;
      }
      .brand-row {
        padding: 0 12px;
      }
      .hotline {
        display: none;
      }
    }

    /* 按钮重塑 */
    .btn-primary-custom {
      background: var(--accent);
      border: none;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      letter-spacing: 0.5px;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(255,107,53,0.2);
    }
    .btn-primary-custom:hover {
      background: #E55A2B;
      box-shadow: 0 6px 16px rgba(255,107,53,0.35);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      letter-spacing: 0.5px;
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }

    /* 卡片 */
    .card-custom {
      background: white;
      border: none;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      padding: 28px 24px;
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .testimonial-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      box-shadow: inset 0 1px 3px rgba(0,0,0,0.02);
      height: 100%;
    }
    .data-card {
      background: transparent;
      border: none;
      text-align: center;
      padding: 20px;
    }
    .data-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }
    .data-line {
      width: 40px;
      height: 3px;
      background: linear-gradient(to right, var(--primary), var(--secondary));
      margin: 12px auto;
      border-radius: 2px;
    }

    /* 手风琴 */
    .accordion-button {
      background: white;
      font-weight: 600;
      font-size: 16px;
      color: var(--text-dark);
      box-shadow: none;
      border-bottom: 1px solid var(--border-light);
      border-radius: 0 !important;
      padding: 18px 0;
    }
    .accordion-button:not(.collapsed) {
      background: #EBF2FA;
      color: var(--primary);
      border-left: 3px solid var(--primary);
      box-shadow: none;
    }
    .accordion-button::after {
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%234A4A4A'%3E%3Cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
      transition: transform 0.3s;
    }
    .accordion-body {
      font-size: 14px;
      color: var(--text-muted);
      padding: 16px 0 24px;
    }

    /* 表单 */
    .form-control {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      padding: 10px 16px;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(10,76,123,0.1);
    }

    /* 板块间距 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 48px 0;
      }
    }

    .footer {
      background: #1E2A38;
      color: #B0BEC5;
      padding: 48px 0 24px;
    }
    .footer a {
      color: #B0BEC5;
    }
    .footer a:hover {
      color: var(--secondary);
    }
    .footer h5 {
      color: white;
      font-size: 14px;
      font-weight: 700;
    }