/* roulang page: index */
/* CSS 变量与基础重置 */
    :root {
      --deep-purple: #3D1C3E;
      --warm-gold: #C8A27A;
      --soft-cream: #FAF7F2;
      --amber-orange: #E07B39;
      --ink-brown: #2C1F1A;
      --warm-gray: #6B5E58;
      --footer-gray: #9B8E84;
      --light-gold-bg: rgba(200,162,122,0.1);
      --card-shadow: 0 2px 16px rgba(61,28,62,0.06);
      --card-shadow-hover: 0 8px 28px rgba(61,28,62,0.12);
      --transition-base: all 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: 'Noto Sans SC', sans-serif;
      background-color: var(--soft-cream);
      color: var(--ink-brown);
      line-height: 1.75;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    
    /* 段落最大宽度 */
    .prose-max {
      max-width: 72ch;
    }
    
    /* 容器 */
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    /* 导航频道标签样式 */
    .channel-tag {
      background-color: rgba(255,255,255,0.7);
      backdrop-filter: blur(4px);
      border-radius: 20px;
      padding: 8px 20px;
      font-size: 15px;
      font-weight: 500;
      color: var(--ink-brown);
      transition: var(--transition-base);
      white-space: nowrap;
      border: 1px solid transparent;
    }
    .channel-tag:hover {
      background-color: rgba(200,162,122,0.15);
      color: #2C1F1A;
    }
    .channel-tag.active {
      background-color: transparent;
      border-bottom: 3px solid var(--warm-gold);
      border-radius: 0;
      font-weight: 600;
      color: var(--deep-purple);
    }
    
    /* 移动端频道滚动隐藏滚动条 */
    .nav-scroll::-webkit-scrollbar {
      display: none;
    }
    .nav-scroll {
      -ms-overflow-style: none;
      scrollbar-width: none;
    }
    
    /* 卡片悬浮效果 */
    .service-card {
      background: white;
      border-radius: 12px;
      padding: 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition-base);
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .service-card:hover .card-title {
      text-decoration-color: var(--warm-gold);
      text-underline-offset: 6px;
      text-decoration: underline;
      text-decoration-thickness: 2px;
    }
    
    /* 主按钮 */
    .btn-primary {
      background-color: var(--amber-orange);
      color: white;
      font-weight: 600;
      font-size: 16px;
      padding: 14px 32px;
      border-radius: 8px;
      border: none;
      cursor: pointer;
      transition: var(--transition-base);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background-color: #C96A2E;
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(224,123,57,0.25);
    }
    
    /* 次按钮 */
    .btn-outline {
      background: transparent;
      border: 1px solid var(--warm-gold);
      color: var(--warm-gold);
      font-weight: 600;
      font-size: 16px;
      padding: 14px 32px;
      border-radius: 8px;
      cursor: pointer;
      transition: var(--transition-base);
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background-color: rgba(200,162,122,0.1);
      border-color: #b88a5c;
      color: #b88a5c;
      transform: translateY(-2px);
    }
    
    /* 输入框样式 */
    .input-field {
      background: white;
      border: none;
      border-radius: 8px;
      padding: 14px 16px;
      box-shadow: inset 0 1px 4px rgba(0,0,0,0.08);
      width: 100%;
      font-size: 16px;
      outline: none;
      transition: box-shadow 0.2s;
    }
    .input-field:focus {
      box-shadow: inset 0 1px 4px rgba(0,0,0,0.08), 0 0 0 2px rgba(200,162,122,0.4);
    }
    
    /* 数据看板卡片顶部线条 */
    .stat-card {
      background: white;
      border-radius: 12px;
      padding: 24px 20px;
      box-shadow: var(--card-shadow);
      position: relative;
      overflow: hidden;
    }
    .stat-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 20px;
      width: 40px;
      height: 3px;
      background-color: var(--warm-gold);
      border-radius: 0 0 4px 4px;
    }
    
    /* 对比区域样式 */
    .compare-left {
      background-color: #E5E0DA;
      border-radius: 16px 0 0 16px;
      padding: 2rem;
    }
    .compare-right {
      background-color: #F5EDE3;
      border-radius: 0 16px 16px 0;
      padding: 2rem;
      border-left: 2px solid rgba(200,162,122,0.3);
    }
    
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(107,94,88,0.2);
    }
    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      color: var(--deep-purple);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      color: var(--warm-gray);
      padding: 0 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    .faq-icon {
      transition: transform 0.3s;
      font-size: 20px;
      color: var(--warm-gold);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    
    /* 响应式调整 */
    @media (max-width: 1024px) {
      .compare-left, .compare-right {
        border-radius: 16px;
      }
      .compare-right {
        border-left: none;
      }
    }
    @media (max-width: 768px) {
      .container-custom {
        padding-left: 1rem;
        padding-right: 1rem;
      }
      h1 {
        font-size: 28px !important;
      }
      h2 {
        font-size: 26px !important;
      }
    }