/* roulang page: index */
:root {
      --primary: #C8A45C;
      --primary-hover: #D4AF6D;
      --secondary: #2B1D14;
      --accent: #8B3A3A;
      --bg-warm: #F9F7F4;
      --bg-card: #FFFFFF;
      --text-dark: #333333;
      --text-heading: #2B1D14;
      --text-light: #F5E6C8;
      --border-light: rgba(200,164,92,0.25);
      --shadow-sm: 0 6px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 28px rgba(0,0,0,0.06);
      --shadow-lg: 0 20px 40px rgba(0,0,0,0.08);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --font-serif: 'Noto Serif SC', 'Georgia', 'Times New Roman', serif;
      --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, .serif {
      font-family: var(--font-serif);
      color: var(--text-heading);
      letter-spacing: 0.02em;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 导航 */
    #header {
      background-color: rgba(43,29,20,0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      transition: background-color 0.3s;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      border-bottom: 1px solid rgba(200,164,92,0.25);
    }
    .header-scrolled {
      background-color: rgba(43,29,20,0.96);
    }
    .nav-link {
      color: #F5E6C8;
      font-weight: 500;
      position: relative;
      padding: 8px 0;
      transition: var(--transition);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .active-nav {
      color: var(--primary) !important;
    }
    .active-nav::after {
      width: 100%;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #2B1D14;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: 30px;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(200,164,92,0.4);
      border: none;
      cursor: pointer;
      display: inline-block;
      text-align: center;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background-color: #D4AF6D;
      box-shadow: 0 8px 18px rgba(200,164,92,0.55);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid #F5E6C8;
      color: #F5E6C8;
      font-weight: 500;
      padding: 10px 24px;
      border-radius: 30px;
      transition: var(--transition);
      cursor: pointer;
    }
    .btn-outline:hover {
      background-color: rgba(245,230,200,0.15);
      border-color: var(--primary);
      color: var(--primary);
    }
    /* Hero */
    .hero-bg {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
    }
    .hero-overlay {
      background: linear-gradient(180deg, rgba(0,0,0,0.7) 0%, rgba(43,29,20,0.8) 100%);
    }
    .text-shadow-gold {
      text-shadow: 0 4px 18px rgba(0,0,0,0.7);
    }
    /* 卡片 */
    .feature-card, .case-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid rgba(200,164,92,0.12);
    }
    .feature-card:hover, .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(200,164,92,0.35);
    }
    .service-img {
      border-radius: var(--radius-md);
      object-fit: cover;
      width: 100%;
      height: auto;
      box-shadow: var(--shadow-md);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(200,164,92,0.2);
      background: #FFFFFF;
      border-radius: 10px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      background: #FDFAF5;
      padding: 18px 24px;
      font-weight: 600;
      color: var(--text-heading);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-family: var(--font-serif);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s;
      background: white;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
      color: var(--primary);
    }
    /* 页脚 */
    footer {
      background-color: #2B1D14;
      color: #E5D5B7;
    }
    footer a {
      color: #E5D5B7;
      transition: color 0.2s;
    }
    footer a:hover {
      color: var(--primary);
      text-decoration: underline;
    }
    @media (max-width: 768px) {
      .mobile-menu {
        display: none;
        flex-direction: column;
        background: #2B1D14;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        padding: 24px;
        gap: 16px;
      }
      .mobile-menu.open {
        display: flex;
      }
    }