/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary-deep: #1E0A3C;
      --primary-electric: #8B5CF6;
      --accent-neon: #00F0FF;
      --accent-gold: #F59E0B;
      --bg-dark-start: #0F0A1A;
      --bg-dark-end: #1A1033;
      --text-body: #E0E0E0;
      --text-muted: #9CA3AF;
      --card-bg: rgba(30, 10, 60, 0.6);
      --card-border: rgba(255, 255, 255, 0.08);
      --glass-blur: blur(16px);
      --radius-lg: 16px;
      --radius-full: 9999px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background: linear-gradient(135deg, var(--bg-dark-start) 0%, var(--bg-dark-end) 100%);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    /* 自定义玻璃拟态卡片 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
    }
    
    .glass-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 40px rgba(139, 92, 246, 0.25);
      border-color: var(--accent-neon);
    }
    
    /* 导航Dock */
    .nav-dock {
      background: rgba(15, 10, 26, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(139, 92, 246, 0.3);
      border-radius: 40px;
      padding: 8px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: max-content;
      max-width: 95%;
      margin: 0 auto;
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 50;
      box-shadow: 0 12px 28px rgba(0,0,0,0.6);
    }
    
    .nav-link {
      color: #cbd5e1;
      font-weight: 500;
      transition: color var(--transition-smooth);
      text-decoration: none;
      font-size: 0.95rem;
    }
    
    .nav-link:hover {
      color: var(--accent-neon);
    }
    
    /* 按钮样式 */
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-electric), var(--accent-gold));
      color: white;
      border-radius: var(--radius-full);
      padding: 12px 28px;
      font-weight: 600;
      font-size: 1rem;
      transition: all var(--transition-smooth);
      box-shadow: 0 4px 14px rgba(139, 92, 246, 0.4);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      border: none;
      cursor: pointer;
      text-decoration: none;
    }
    
    .btn-primary:hover {
      transform: scale(1.05);
      box-shadow: 0 0 24px rgba(139, 92, 246, 0.7);
    }
    
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-neon);
      color: var(--accent-neon);
      border-radius: var(--radius-full);
      padding: 10px 22px;
      font-weight: 500;
      transition: all var(--transition-smooth);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    
    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      border-color: #fff;
      color: #fff;
    }
    
    /* 脉冲动画 */
    @keyframes pulse-glow {
      0% { box-shadow: 0 0 0 0 rgba(139, 92, 246, 0.7); }
      70% { box-shadow: 0 0 0 15px rgba(139, 92, 246, 0); }
      100% { box-shadow: 0 0 0 0 rgba(139, 92, 246, 0); }
    }
    .pulse-glow {
      animation: pulse-glow 2s infinite;
    }
    
    /* 滚动淡入 */
    .fade-up {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }
    
    /* 移动端底部导航 */
    @media (max-width: 767px) {
      .nav-dock {
        top: auto;
        bottom: 16px;
        width: 92%;
        border-radius: 40px;
        padding: 10px 20px;
        justify-content: space-around;
        background: rgba(15, 10, 26, 0.9);
      }
      .nav-dock .nav-links-desktop {
        display: none;
      }
      .nav-dock .mobile-hidden {
        display: none;
      }
      .mobile-visible {
        display: flex !important;
      }
      h1 {
        font-size: 36px !important;
      }
      h2 {
        font-size: 28px !important;
      }
    }
    
    @media (min-width: 768px) {
      .mobile-visible {
        display: none !important;
      }
      .nav-dock .nav-links-desktop {
        display: flex;
        gap: 2rem;
      }
    }
    
    /* FAQ 动画 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease-in-out;
    }
    .faq-item.active .faq-content {
      max-height: 300px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-icon {
      transition: transform 0.3s ease;
    }
    
    /* 自定义滚动条 */
    ::-webkit-scrollbar {
      width: 6px;
    }
    ::-webkit-scrollbar-track {
      background: #1A1033;
    }
    ::-webkit-scrollbar-thumb {
      background: #8B5CF6;
      border-radius: 10px;
    }