/* roulang page: index */
:root {
      --primary: #1A1A2E;
      --primary-light: #2D2D44;
      --secondary: #E8DED1;
      --accent: #C9A96E;
      --accent-hover: #B39350;
      --bg-page: #F5F1EB;
      --card-bg: #FFFFFF;
      --border-card: #E0D9CE;
      --text-primary: #1A1A2E;
      --text-secondary: #4A4A5A;
      --text-muted: #7A7A8A;
      --success: #2D6A4F;
      --warning: #B05B3B;
      --shadow-sm: 0 4px 24px rgba(26, 26, 46, 0.06);
      --shadow-md: 0 12px 32px rgba(26, 26, 46, 0.12);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-full: 50px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 导航栏 */
    .nav-glass {
      backdrop-filter: blur(12px);
      background: rgba(245, 241, 235, 0.85);
      border-bottom: 1px solid rgba(224, 217, 206, 0.5);
      height: 72px;
      display: flex;
      align-items: center;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      transition: var(--transition-smooth);
    }
    .nav-link {
      color: rgba(26, 26, 46, 0.8);
      font-weight: 500;
      text-decoration: none;
      padding: 0.5rem 1rem;
      position: relative;
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-link:hover {
      color: #1A1A2E;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after {
      width: 60%;
    }
    .logo-text {
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      color: #1A1A2E;
      text-decoration: none;
      line-height: 1.2;
      display: flex;
      flex-direction: column;
    }
    .logo-domain {
      font-size: 0.65rem;
      font-weight: 400;
      color: var(--text-muted);
      letter-spacing: 0.3px;
      margin-top: -2px;
    }
    /* 按钮样式 */
    .btn-primary {
      background: var(--accent);
      color: #FFFFFF;
      border-radius: var(--radius-full);
      padding: 0.875rem 2.25rem;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-block;
      text-decoration: none;
      font-size: 1rem;
      box-shadow: 0 8px 18px rgba(201, 169, 110, 0.25);
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: scale(1.03);
      box-shadow: 0 12px 24px rgba(179, 147, 80, 0.35);
    }
    .btn-outline {
      border: 1.5px solid #1A1A2E;
      color: #1A1A2E;
      background: transparent;
      border-radius: var(--radius-full);
      padding: 0.875rem 2.25rem;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-block;
      text-decoration: none;
      font-size: 1rem;
      text-align: center;
    }
    .btn-outline:hover {
      background: #1A1A2E;
      color: white;
      border-color: #1A1A2E;
    }
    /* 卡片体系 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      padding: 2rem;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 2rem;
      margin-bottom: 1.25rem;
      transition: transform 0.2s;
    }
    .card:hover .feature-icon {
      transform: rotate(5deg);
    }
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid #E0D9CE;
      padding: 1.25rem 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-primary);
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--accent);
    }
    .faq-icon {
      font-size: 1.5rem;
      font-weight: 300;
      transition: transform 0.3s ease;
      color: var(--accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s cubic-bezier(0.33, 1, 0.68, 1);
      color: var(--text-secondary);
      padding-right: 2rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 0.75rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* 响应式调整 */
    @media (max-width: 1024px) {
      .container {
        padding-left: 1rem;
        padding-right: 1rem;
      }
      .hero-title {
        font-size: 2.6rem !important;
      }
    }
    @media (max-width: 768px) {
      .nav-glass {
        height: 64px;
      }
      .mobile-hidden {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-section {
        flex-direction: column;
        text-align: center;
        padding-top: 6rem;
        padding-bottom: 3rem;
      }
      .hero-text {
        order: 1;
        margin-bottom: 2rem;
      }
      .hero-image {
        order: 0;
        margin-bottom: 2rem;
      }
      .grid-cols-2, .grid-cols-3 {
        grid-template-columns: 1fr !important;
      }
      .faq-grid {
        grid-template-columns: 1fr !important;
      }
      section {
        padding-top: 4rem !important;
        padding-bottom: 4rem !important;
      }
      .alt-row {
        flex-direction: column !important;
      }
      .alt-img {
        order: -1;
        margin-bottom: 1.5rem;
      }
    }
    @media (max-width: 520px) {
      .btn-primary, .btn-outline {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
      }
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: #1A1A2E;
    }
    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
        position: absolute;
        right: 1.5rem;
        top: 1rem;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        right: 1rem;
        background: rgba(245,241,235,0.98);
        backdrop-filter: blur(20px);
        border-radius: 20px;
        box-shadow: var(--shadow-md);
        flex-direction: column;
        padding: 1.5rem 2rem;
        gap: 1rem;
      }
      .nav-links.show {
        display: flex;
      }
    }