/* roulang page: index */
:root {
      --primary: #0B4F4A;
      --primary-dark: #083D38;
      --accent: #C49A2B;
      --bg-warm: #FAFAF9;
      --surface: #FFFFFF;
      --dark-bg: #1A1D1C;
      --text-heading: #0B2E2A;
      --text-body: #4A4D4C;
      --text-muted: #7A7D7C;
      --border-light: #E8ECEB;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-serif: "Noto Serif SC", "PingFang SC", "Microsoft YaHei", serif;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-number: "Inter", sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      font-size: 16px;
    }
    h1, h2, h3, .font-serif {
      font-family: var(--font-serif);
    }
    .number-font {
      font-family: var(--font-number);
    }
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 装饰短线 */
    .decorative-line {
      width: 48px;
      height: 4px;
      background-color: var(--primary);
      margin-top: 0.75rem;
      border-radius: 2px;
    }
    /* 导航样式 */
    .nav-blur {
      backdrop-filter: blur(12px);
      background-color: rgba(250, 250, 249, 0.8);
      transition: box-shadow 0.2s;
    }
    .nav-shadow {
      box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    }
    .chip-active {
      color: var(--primary) !important;
      border-bottom: 2px solid var(--primary);
      background-color: rgba(11, 79, 74, 0.04);
      border-radius: 4px 4px 0 0;
      padding-bottom: 4px;
    }
    /* 按钮 */
    .btn-primary {
      background-color: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.875rem 2rem;
      font-weight: 500;
      transition: background-color 0.2s, transform 0.1s;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-primary:hover {
      background-color: var(--primary-dark);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 0.875rem 2rem;
      font-weight: 500;
      transition: background-color 0.2s, color 0.2s;
      display: inline-block;
      text-align: center;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-outline:hover {
      background-color: rgba(11, 79, 74, 0.08);
    }
    .btn-white-outline {
      background: transparent;
      border: 1px solid white;
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.875rem 2rem;
      font-weight: 500;
      transition: all 0.2s;
      display: inline-block;
      text-align: center;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-white-outline:hover {
      background-color: white;
      color: var(--primary);
    }
    /* 卡片 */
    .card {
      background: var(--surface);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .pricing-card {
      background: #F2F4F4;
      border-radius: var(--radius-card);
      padding: 2rem;
      transition: all 0.2s;
    }
    .pricing-card.featured {
      background: white;
      border-top: 4px solid var(--primary);
      box-shadow: var(--shadow-md);
      transform: scale(1.02);
    }
    /* FAQ */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
    }
    .faq-arrow {
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }
    /* 图片灰度 */
    .logo-grayscale img {
      filter: grayscale(100%) opacity(70%);
      transition: filter 0.3s, opacity 0.3s;
    }
    .logo-grayscale img:hover {
      filter: none;
      opacity: 1;
    }
    /* 移动端菜单 */
    .mobile-menu {
      display: none;
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
      .mobile-nav-items {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 1rem 1.5rem;
        box-shadow: 0 8px 20px rgba(0,0,0,0.05);
      }
      .mobile-nav-items.active {
        display: flex;
      }
    }