/* roulang page: index */
/* ========== CSS 设计变量（覆盖 Bootstrap） ========== */
    :root {
      --primary-deep: #1A1F36;
      --accent-gold: #C9A96E;
      --accent-gold-hover: #B8934A;
      --bg-warm: #F8F7F4;
      --bg-card: #FFFFFF;
      --bg-subtle: #F0EFEA;
      --text-primary: #1A1F36;
      --text-body: #4A4D5C;
      --text-muted: #7A7D8A;
      --text-on-dark: #FFFFFF;
      --text-on-dark-muted: #D1D3DB;
      --border-light: #E8E7E2;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-hover: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-h1: 48px;
      --font-h2: 36px;
      --font-h3: 22px;
      --font-body: 16px;
      --font-small: 13px;
      --container-max: 1200px;
      --nav-height: 64px;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      font-size: var(--font-body);
      line-height: 1.75;
      color: var(--text-body);
      background-color: var(--bg-warm);
      margin: 0;
      padding: 0;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4, h5 {
      font-weight: 600;
      color: var(--text-primary);
    }
    
    a {
      text-decoration: none;
      transition: color 0.25s ease;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 覆盖 Bootstrap 默认 */
    .btn {
      border-radius: var(--radius-btn);
      font-weight: 600;
      padding: 14px 32px;
      transition: all 0.25s ease;
      letter-spacing: 0.3px;
    }
    .btn-primary {
      background-color: var(--accent-gold);
      border-color: var(--accent-gold);
      color: var(--primary-deep);
    }
    .btn-primary:hover, .btn-primary:focus {
      background-color: var(--accent-gold-hover);
      border-color: var(--accent-gold-hover);
      color: #fff;
      box-shadow: none;
    }
    .btn-outline-primary {
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      background: transparent;
    }
    .btn-outline-primary:hover {
      background-color: var(--primary-deep);
      border-color: var(--primary-deep);
      color: #fff;
    }
    .btn-light-custom {
      background: transparent;
      border: 1.5px solid #fff;
      color: #fff;
    }
    .btn-light-custom:hover {
      background: #fff;
      color: var(--primary-deep);
    }
    
    .card {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: all 0.3s ease;
      background: var(--bg-card);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    .section-title {
      font-size: var(--font-h2);
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 16px;
      text-align: center;
      color: var(--text-primary);
      position: relative;
      padding-bottom: 20px;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 40px;
      height: 2px;
      background-color: var(--accent-gold);
    }
    
    .container-custom {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }
    
    /* 导航栏 */
    .navbar-custom {
      height: var(--nav-height);
      background: rgba(248, 247, 244, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1030;
      display: flex;
      align-items: center;
    }
    .navbar-custom .container-custom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo-text {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
    }
    .logo-dot {
      width: 8px;
      height: 8px;
      background: var(--accent-gold);
      border-radius: 50%;
      margin-left: 10px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      padding-bottom: 4px;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--accent-gold);
      border-bottom-color: var(--accent-gold);
    }
    .search-box {
      background: var(--bg-subtle);
      border-radius: 20px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      margin-right: 12px;
      font-size: 14px;
      color: var(--text-muted);
      border: 1px solid transparent;
    }
    .search-box i {
      font-size: 14px;
    }
    .nav-cta {
      padding: 10px 24px;
      font-size: 14px;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--primary-deep);
    }
    
    @media (max-width: 768px) {
      .nav-links, .search-box, .nav-cta.desktop {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--bg-warm);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        font-size: 22px;
        display: none;
        z-index: 1029;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        color: var(--primary-deep);
        font-weight: 500;
      }
    }