/* roulang page: index */
/* 设计变量与补充样式 */
    :root {
      --primary: #E3410E;
      --primary-hover: #C4350A;
      --secondary: #0B0E14;
      --accent: #FFB81C;
      --warm-bg: #F5F1EB;
      --white-card: #FFFFFF;
      --gray-border: #E5E0DA;
      --text-main: #1F1F1F;
      --text-weak: #6B6B6B;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 20px rgba(227,65,14,0.12);
      --font-title: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      font-family: var(--font-title);
      background-color: var(--warm-bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }
    
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    
    /* 卡片通用样式 */
    .card-hover {
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      border-radius: var(--radius-card);
      background: var(--white-card);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--gray-border);
    }
    
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    /* 按钮组件 */
    .btn-primary {
      background-color: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: scale(1.02);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 10px 26px;
      font-weight: 600;
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
    }
    
    .btn-outline:hover {
      background-color: rgba(227,65,14,0.1);
      border-color: var(--primary-hover);
      color: var(--primary-hover);
    }
    
    .btn-white {
      background: white;
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      font-weight: 700;
      transition: all 0.2s ease;
    }
    
    .btn-white-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      border-radius: var(--radius-btn);
      padding: 10px 30px;
      font-weight: 600;
      transition: all 0.2s ease;
    }
    
    .btn-white-outline:hover {
      background: white;
      color: var(--primary);
    }
    
    /* 导航 */
    .nav-link {
      position: relative;
      font-weight: 500;
      transition: color 0.2s;
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s ease;
    }
    
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    
    /* 手风琴动画 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    
    /* 汉堡菜单 */
    .mobile-menu {
      transition: transform 0.3s ease;
      transform: translateX(100%);
    }
    
    .mobile-menu.open {
      transform: translateX(0);
    }
    
    /* 图片饱和度 */
    .img-saturate {
      transition: filter 0.3s ease;
    }
    
    .card-hover:hover .img-saturate {
      filter: saturate(1.3);
    }