/* roulang page: index */
:root {
      --primary: #E8432C;
      --primary-hover: #C93521;
      --secondary: #0F5B7A;
      --dark-bg: #1E1F24;
      --darker-bg: #17181C;
      --body-bg: #F8F9FA;
      --text-main: #1E1F24;
      --text-secondary: #5A5C63;
      --text-muted: #92959A;
      --white: #FFFFFF;
      --border-light: #E9EBEE;
      --success: #00A86B;
      --card-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 4px 12px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', '苹方', 'Hiragino Sans GB', 'Segoe UI', system-ui, -apple-system, sans-serif;
      --transition: all 0.2s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--body-bg);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      margin: 0;
      padding-top: 64px;
    }
    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-weight: 600;
      letter-spacing: -0.2px;
    }
    h1 {
      font-size: 40px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }
    h2 {
      font-size: 30px;
      font-weight: 600;
    }
    h3 {
      font-size: 20px;
      font-weight: 600;
    }
    .text-muted-custom {
      color: var(--text-secondary);
    }
    .text-soft {
      color: var(--text-muted);
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--primary-hover);
    }
    .btn {
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: var(--transition);
      border: none;
    }
    .btn-primary-custom {
      background-color: var(--primary);
      color: var(--white);
      border: 1px solid var(--primary);
    }
    .btn-primary-custom:hover {
      background-color: var(--primary-hover);
      border-color: var(--primary-hover);
      color: var(--white);
      transform: translateY(-1px);
      box-shadow: 0 4px 10px rgba(232, 67, 44, 0.3);
    }
    .btn-outline-custom {
      background: transparent;
      color: var(--primary);
      border: 1px solid var(--primary);
    }
    .btn-outline-custom:hover {
      background-color: rgba(232, 67, 44, 0.05);
      color: var(--primary-hover);
      border-color: var(--primary-hover);
    }
    .btn-lg-custom {
      padding: 14px 36px;
      font-size: 17px;
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航 */
    .navbar-custom {
      background: var(--white);
      height: 64px;
      border-bottom: 1px solid var(--border-light);
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1030;
      display: flex;
      align-items: center;
    }
    .navbar-brand-custom {
      font-weight: 700;
      font-size: 20px;
      color: var(--text-main) !important;
      letter-spacing: -0.3px;
    }
    .nav-link-custom {
      color: var(--text-secondary) !important;
      font-size: 15px;
      margin: 0 16px;
      padding: 0 !important;
      transition: var(--transition);
      font-weight: 500;
    }
    .nav-link-custom:hover {
      color: var(--primary) !important;
    }
    .search-box {
      background: #F1F3F5;
      border-radius: 30px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      width: 180px;
      transition: width 0.3s ease;
      margin-right: 16px;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 14px;
      width: 100%;
      color: var(--text-main);
    }
    .search-box input::placeholder {
      color: var(--text-muted);
    }
    .search-box:focus-within {
      width: 240px;
      background: #FFFFFF;
      box-shadow: 0 0 0 2px rgba(232,67,44,0.2);
    }
    .navbar-toggler-custom {
      border: none;
      background: transparent;
      color: var(--text-main);
      font-size: 24px;
    }
    @media (max-width: 991px) {
      .navbar-collapse-custom {
        background: white;
        padding: 20px;
        border-radius: 12px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        margin-top: 10px;
      }
      .search-box {
        width: 100%;
        margin: 10px 0;
      }
    }
    /* Hero */
    .hero-section {
      background: var(--white);
      padding: 60px 0;
      position: relative;
    }
    .hero-image-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      min-height: 380px;
      width: 100%;
      box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    }
    /* 板块间距 */
    section {
      padding: 80px 0;
    }
    .bg-light-grey {
      background-color: #F4F5F7;
    }
    .bg-dark {
      background-color: var(--dark-bg);
      color: white;
    }
    /* 卡片 */
    .card-custom {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      padding: 28px;
      transition: var(--transition);
      border: 1px solid var(--border-light);
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-top: 3px solid var(--primary);
    }
    .icon-placeholder {
      width: 48px;
      height: 48px;
      background: rgba(232,67,44,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 24px;
      margin-bottom: 20px;
    }
    /* 数据看板 */
    .data-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
      font-feature-settings: "tnum";
    }
    .data-label {
      font-size: 15px;
      color: var(--text-secondary);
      margin-top: 4px;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      background: #F8F9FA;
      padding: 16px 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: background 0.2s;
    }
    .faq-question:hover {
      background: #EEF0F2;
    }
    .faq-answer {
      padding: 16px 20px;
      background: white;
      color: var(--text-secondary);
      display: none;
    }
    .faq-answer.show {
      display: block;
    }
    /* 页脚 */
    .footer-links a {
      color: var(--text-muted);
      display: block;
      margin-bottom: 8px;
    }
    .footer-links a:hover {
      color: white;
    }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .hero-image-bg { min-height: 250px; margin-top: 30px; }
    }