/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --red: #D42E1A;
      --red-hover: #B82515;
      --gold: #F5A623;
      --dark: #1A1A2E;
      --warm-bg: #F9F6F0;
      --text-main: #1E1E1E;
      --text-muted: #5A5A5A;
      --card-bg: #FFFFFF;
      --card-hover-bg: #FFF9F5;
      --border-light: #F0E8DF;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(212,46,26,0.12);
      --shadow-gold: 0 0 20px rgba(245,166,35,0.25);
      --radius-xl: 24px;
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-btn: 12px;
      --radius-sm: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'DIN Alternate', 'Bebas Neue', 'PingFang SC', sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      font-family: var(--font-body);
      line-height: 1.7;
      color: var(--text-main);
      background-color: #FFFFFF;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.25s ease;
    }
    
    /* 自定义容器宽度 */
    .container-custom {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    /* 导航卡片面板 */
    .nav-panel {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-lg);
      padding: 12px 20px;
      box-shadow: 0 4px 24px rgba(0,0,0,0.06);
    }
    
    .nav-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 500;
      color: #4B4B4B;
      transition: all 0.2s ease;
      background: transparent;
    }
    
    .nav-item:hover {
      background-color: #FFF0ED;
      color: var(--red);
    }
    
    .btn-primary {
      background-color: var(--red);
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 24px;
      font-weight: 600;
      font-size: 16px;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(212,46,26,0.25);
    }
    
    .btn-primary:hover {
      background-color: var(--red-hover);
      box-shadow: 0 8px 18px rgba(212,46,26,0.35);
      transform: translateY(-1px);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--red);
      color: var(--red);
      border-radius: var(--radius-btn);
      padding: 12px 24px;
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    
    .btn-outline:hover {
      background-color: #FFF0ED;
      border-color: var(--red-hover);
      color: var(--red-hover);
    }
    
    .btn-gold {
      background-color: var(--gold);
      color: #1A1A2E;
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 12px 24px;
      border: none;
      box-shadow: 0 4px 12px rgba(245,166,35,0.3);
    }
    
    .btn-gold:hover {
      background-color: #E59400;
      box-shadow: 0 8px 18px rgba(245,166,35,0.45);
      transform: translateY(-1px);
    }
    
    /* Hero渐变背景 */
    .hero-gradient {
      background: linear-gradient(135deg, #1A1A2E 0%, #2D1A1A 100%);
      position: relative;
    }
    
    .hero-gradient::after {
      content: '';
      position: absolute;
      bottom: 0;
      right: 0;
      width: 60%;
      height: 70%;
      background: radial-gradient(circle at 80% 80%, rgba(245,166,35,0.25) 0%, transparent 70%);
      pointer-events: none;
    }
    
    /* 卡片悬停效果 */
    .card-hover {
      transition: all 0.25s ease;
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }
    
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      background-color: var(--card-hover-bg);
      border-color: rgba(212,46,26,0.15);
    }
    
    .card-recommended {
      border: 2px solid var(--gold);
      box-shadow: var(--shadow-gold);
    }
    
    /* 数据徽章 */
    .badge-number {
      font-family: var(--font-number);
      font-size: 40px;
      font-weight: 700;
      color: var(--gold);
      line-height: 1.2;
    }
    
    /* FAQ手风琴模拟 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    
    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 600;
      font-size: 18px;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-muted);
      font-size: 16px;
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    
    .faq-icon {
      font-size: 24px;
      color: var(--red);
      transition: transform 0.3s ease;
    }
    
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    
    /* 移动端底部导航 */
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: rgba(26,26,46,0.95);
        backdrop-filter: blur(20px);
        padding: 12px 16px;
        justify-content: space-around;
        border-radius: 24px 24px 0 0;
        z-index: 50;
      }
      .mobile-nav-link {
        color: #CCCCCC;
        font-size: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
        transition: 0.2s;
      }
      .mobile-nav-link:hover, .mobile-nav-link.active {
        color: var(--gold);
      }
    }
    
    @media (min-width: 769px) {
      .mobile-bottom-nav {
        display: none;
      }
    }