/* roulang page: index */
:root {
      --primary-deep: #1A3B5C;
      --accent-gold: #C9A96E;
      --bg-light: #F8F9FA;
      --card-white: #FFFFFF;
      --text-dark: #2C3E50;
      --text-muted: #5A6A7E;
      --border-light: #E9ECEF;
      --shadow-sm: 0 8px 30px rgba(0,0,0,0.05);
      --shadow-hover: 0 12px 40px rgba(0,0,0,0.1);
      --radius-card: 12px;
      --radius-btn: 6px;
      --transition-base: 0.25s ease;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg-light);
      color: var(--text-muted);
      margin: 0;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, .h1, .h2, .h3 {
      color: var(--primary-deep);
      font-weight: 600;
      letter-spacing: -0.2px;
    }
    a {
      text-decoration: none;
      transition: color var(--transition-base);
    }
    img {
      max-width: 100%;
      height: auto;
    }
    /* 自定义容器微调 */
    .custom-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
    }
    /* 导航栏 */
    .navbar-custom {
      background-color: #fff;
      padding: 0.8rem 0;
      transition: box-shadow 0.3s ease;
      height: 70px;
    }
    .navbar-custom.scrolled {
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }
    .navbar-brand-custom {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-deep) !important;
      display: flex;
      align-items: center;
    }
    .nav-link-custom {
      color: var(--text-muted) !important;
      font-weight: 500;
      margin: 0 0.5rem;
      padding: 0.5rem 0.8rem !important;
      border-bottom: 2px solid transparent;
      transition: all 0.2s;
    }
    .nav-link-custom:hover, .nav-link-custom.active {
      color: var(--primary-deep) !important;
      border-bottom-color: var(--accent-gold);
    }
    .btn-gold {
      background-color: var(--accent-gold);
      color: var(--primary-deep);
      font-weight: 600;
      border: none;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      transition: background 0.2s, transform 0.1s;
      font-size: 1rem;
    }
    .btn-gold:hover {
      background-color: #b58d4b;
      color: #fff;
      transform: translateY(-1px);
    }
    .btn-outline-primary {
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      background: transparent;
      font-weight: 600;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      transition: all 0.2s;
    }
    .btn-outline-primary:hover {
      background-color: var(--primary-deep);
      color: white;
      border-color: var(--primary-deep);
    }
    .btn-primary {
      background-color: var(--primary-deep);
      border-color: var(--primary-deep);
      font-weight: 600;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-btn);
      transition: all 0.2s;
      color: white;
    }
    .btn-primary:hover {
      background-color: #2C5A82;
      border-color: #2C5A82;
      transform: translateY(-1px);
    }
    .badge-new {
      background-color: var(--accent-gold);
      color: #fff;
      font-size: 0.7rem;
      padding: 0.2rem 0.5rem;
      border-radius: 4px;
      margin-left: 4px;
    }
    /* 板块标题装饰线 */
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 55px;
      height: 3px;
      background-color: var(--accent-gold);
      margin-top: 0.75rem;
    }
    .text-center .section-title::after {
      margin-left: auto;
      margin-right: auto;
    }
    /* 卡片样式 */
    .card-custom {
      background: var(--card-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-base);
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: transparent;
    }
    .advantage-card {
      padding: 2rem 1.5rem;
      position: relative;
    }
    .advantage-card .gold-line {
      width: 4px;
      height: 48px;
      background-color: var(--accent-gold);
      position: absolute;
      left: 0;
      top: 25px;
      border-radius: 0 4px 4px 0;
    }
    .stat-card {
      background: #EDF2F7;
      border-radius: 12px;
      padding: 1.8rem 1rem;
      text-align: center;
      box-shadow: none;
      transition: 0.2s;
    }
    .stat-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary-deep);
      line-height: 1.2;
    }
    /* FAQ 手风琴覆盖 */
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--accent-gold);
      box-shadow: none;
      font-weight: 600;
    }
    .accordion-button:focus {
      border-color: transparent;
      box-shadow: none;
    }
    .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
      background: transparent;
    }
    .accordion-button {
      font-weight: 600;
      color: var(--primary-deep);
      font-size: 1.1rem;
    }
    /* 表单 */
    .form-control {
      border-radius: 6px;
      border: 1px solid #D1D9E0;
      padding: 0.7rem 1rem;
    }
    .form-control:focus {
      border-color: var(--primary-deep);
      box-shadow: 0 0 0 0.2rem rgba(26,59,92,0.15);
    }
    /* 页脚 */
    footer {
      background: #fff;
      border-top: 1px solid var(--border-light);
    }
    @media (max-width: 768px) {
      .navbar-collapse {
        background: white;
        padding: 1rem;
        border-radius: 12px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .section-title {
        font-size: 1.9rem;
      }
      h1.display-4 {
        font-size: 2.3rem;
      }
    }