/* roulang page: index */
:root {
      --brand-deep: #1A2B4C;
      --brand-gold: #C8A96E;
      --brand-gold-hover: #B8934F;
      --brand-light: #ECF0F5;
      --body-bg: #F7F8FA;
      --card-bg: #FFFFFF;
      --text-primary: #1A2B4C;
      --text-secondary: #5A6B7F;
      --text-muted: #7B8BA1;
      --border-light: rgba(0,0,0,0.04);
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
      background-color: var(--body-bg);
      color: var(--text-primary);
      line-height: 1.6;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 768px) {
      .container {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    .section {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }
    @media (max-width: 767px) {
      .section {
        padding-top: 3.5rem;
        padding-bottom: 3.5rem;
      }
    }
    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(4px);
      box-shadow: var(--shadow-nav, 0 1px 6px rgba(0,0,0,0.04));
      z-index: 50;
      transition: box-shadow 0.2s;
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-secondary);
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-link:hover {
      color: var(--brand-deep);
    }
    .btn-primary {
      background-color: var(--brand-gold);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.6rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.2s, box-shadow 0.2s;
      box-shadow: 0 2px 6px rgba(0,0,0,0.06);
      border: none;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background-color: var(--brand-gold-hover);
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--brand-deep);
      color: var(--brand-deep);
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.6rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.2s, color 0.2s;
    }
    .btn-outline:hover {
      background-color: rgba(26,43,76,0.05);
    }
    /* 卡片 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: box-shadow 0.25s ease, transform 0.2s ease;
    }
    .card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-2px);
    }
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    .faq-question {
      cursor: pointer;
      padding: 1.2rem 0;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-weight: 600;
      color: var(--brand-deep);
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--brand-gold);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.2s ease;
      background-color: #F9FAFB;
      border-radius: 6px;
      color: var(--text-secondary);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0.8rem 1rem;
      margin-bottom: 0.8rem;
    }
    .faq-indicator {
      width: 4px;
      height: 20px;
      background-color: var(--brand-gold);
      border-radius: 2px;
      margin-right: 12px;
      flex-shrink: 0;
    }
    /* 横向滚动案例 */
    .case-scroll {
      display: flex;
      gap: 1.5rem;
      overflow-x: auto;
      padding-bottom: 1rem;
      scrollbar-width: thin;
      scrollbar-color: #C8A96E #ECF0F5;
    }
    .case-scroll::-webkit-scrollbar {
      height: 6px;
    }
    .case-scroll::-webkit-scrollbar-thumb {
      background: #C8A96E;
      border-radius: 3px;
    }
    .case-card {
      min-width: 280px;
      max-width: 320px;
      flex-shrink: 0;
    }
    @media (min-width: 768px) {
      .case-card {
        min-width: 300px;
      }
    }
    /* 价格高亮 */
    .pricing-highlight {
      border-top: 4px solid var(--brand-gold);
      position: relative;
    }
    .footer-link {
      color: rgba(255,255,255,0.7);
      transition: color 0.2s;
    }
    .footer-link:hover {
      color: var(--brand-gold);
    }