/* roulang page: index */
:root {
      --primary: #1A1A2E;
      --accent: #D4AF37;
      --accent-hover: #C5A028;
      --bg: #F8F9FA;
      --card-bg: #FFFFFF;
      --text: #1E1E1E;
      --text-secondary: #5A5A5A;
      --border: #E9ECEF;
      --success: #2D6A4F;
      --light-accent-bg: #F9F3E3;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --transition: 0.25s ease;
      --max-width: 1200px;
      --header-height: 72px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system, sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    
    .inter-font {
      font-family: "Inter", "Segoe UI", system-ui, sans-serif;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      z-index: 1000;
      display: flex;
      align-items: center;
      background: transparent;
      transition: background var(--transition), box-shadow var(--transition);
    }
    
    .header.scrolled {
      background: #FFFFFF;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: 1px;
      transition: color var(--transition);
    }
    .header.scrolled .logo {
      color: var(--primary);
    }
    .logo i {
      color: var(--accent);
      margin-right: 6px;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: #FFFFFF;
      transition: color var(--transition);
    }
    .header.scrolled .nav-links a {
      color: var(--text);
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    
    .btn-primary {
      background: var(--accent);
      color: var(--primary);
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: background var(--transition), box-shadow var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 18px rgba(212,175,55,0.3);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: #FFFFFF;
    }
    
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: #FFFFFF;
      cursor: pointer;
    }
    .header.scrolled .menu-toggle {
      color: var(--primary);
    }
    
    /* 移动端导航 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: #FFFFFF;
      z-index: 999;
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      justify-content: center;
      padding: 32px;
      transform: translateX(100%);
      transition: transform 0.3s ease;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 20px;
      margin: 16px 0;
      color: var(--primary);
      font-weight: 500;
    }
    .mobile-menu .btn-primary {
      margin-top: 24px;
      width: 100%;
      justify-content: center;
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      font-size: 36px;
      color: var(--primary);
    }
    
    /* Hero */
    .hero {
      padding: calc(var(--header-height) + 60px) 0 80px;
      background-color: var(--bg);
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 90%;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 16px;
      box-shadow: var(--shadow-sm);
      width: 100%;
      aspect-ratio: 4/3;
      background-color: #e0e0e0;
    }
    
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }
    .section-title h2 {
      font-size: 36px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .section-title p {
      color: var(--text-secondary);
      font-size: 18px;
    }
    
    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      border: 1px solid transparent;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: var(--border);
    }
    .card-icon {
      font-size: 40px;
      color: var(--accent);
      margin-bottom: 20px;
    }
    .card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .card p {
      color: var(--text-secondary);
    }
    
    /* 左图右文 */
    .feature-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .feature-row:last-child {
      margin-bottom: 0;
    }
    .feature-img {
      background: #e9ecef;
      border-radius: 16px;
      width: 100%;
      aspect-ratio: 16/10;
      background-size: cover;
      background-position: center;
    }
    .feature-list {
      list-style: none;
    }
    .feature-list li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 16px;
    }
    .feature-list li i {
      color: var(--accent);
      font-size: 20px;
      margin-top: 2px;
    }
    
    .scenario-card img {
      border-radius: 12px 12px 0 0;
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
    }
    
    .pricing-card {
      text-align: center;
      position: relative;
    }
    .pricing-card.recommended {
      border: 2px solid var(--accent);
    }
    .badge {
      background: var(--accent);
      color: var(--primary);
      font-size: 14px;
      padding: 4px 16px;
      border-radius: 20px;
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
    }
    .price {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
    }
    
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      display: none;
      padding-top: 16px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    
    .cta-section {
      background: var(--light-accent-bg);
      text-align: center;
    }
    
    .footer {
      background: var(--primary);
      color: #CCCCCC;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a:hover {
      color: var(--accent);
    }
    
    @media (max-width: 1024px) {
      .hero-grid, .feature-row {
        grid-template-columns: 1fr;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .grid-3, .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero h1 { font-size: 36px; }
      section { padding: 60px 0; }
    }