/* roulang page: index */
/* 自定义设计变量与全局重置，兼容深色科技蓝玻璃拟态系统 */
    :root {
      --primary: #0ea5e9;        /* 天空霓虹蓝 */
      --primary-glow: #38bdf8;
      --secondary: #a78bfa;      /* 紫调辅助 */
      --accent: #f472b6;
      --bg-deep: #0b1120;
      --bg-card: rgba(15, 25, 45, 0.6);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-bg: rgba(10, 20, 40, 0.65);
      --text-primary: #f1f5f9;
      --text-secondary: #cbd5e1;
      --text-muted: #94a3b8;
      --radius-lg: 2rem;
      --radius-md: 1.25rem;
      --radius-sm: 0.75rem;
      --shadow-glow: 0 0 20px rgba(14, 165, 233, 0.35);
      --shadow-card: 0 25px 40px -18px rgba(0,0,0,0.6);
      --transition-smooth: all 0.25s ease;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 30% 10%, rgba(14,165,233,0.08) 0%, transparent 50%);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 玻璃拟态卡片通用类 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .glass-card:hover {
      border-color: rgba(14,165,233,0.3);
      box-shadow: 0 30px 45px -15px rgba(14,165,233,0.25);
    }

    /* 发光按钮组件 */
    .btn-glow {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: linear-gradient(135deg, #0ea5e9 0%, #6366f1 100%);
      border: none;
      padding: 0.9rem 2.2rem;
      border-radius: 3rem;
      font-weight: 600;
      color: white;
      letter-spacing: 0.3px;
      box-shadow: 0 8px 22px rgba(14,165,233,0.5);
      transition: all 0.3s ease;
      text-decoration: none;
      cursor: pointer;
    }
    .btn-glow:hover {
      box-shadow: 0 12px 28px rgba(56,189,248,0.8);
      transform: translateY(-2px);
      background: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
    }

    .btn-outline-glow {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      box-shadow: 0 0 10px rgba(14,165,233,0.2);
    }
    .btn-outline-glow:hover {
      background: rgba(14,165,233,0.1);
      box-shadow: 0 0 18px var(--primary-glow);
      border-color: var(--primary-glow);
    }

    /* 导航暗色霓虹风格 */
    header {
      background: rgba(8, 16, 30, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(14,165,233,0.25);
      position: sticky;
      top: 0;
      z-index: 50;
      box-shadow: 0 8px 25px rgba(0,0,0,0.5);
    }

    .nav-link {
      color: var(--text-secondary);
      font-weight: 500;
      padding: 0.5rem 0.8rem;
      border-radius: 2rem;
      transition: 0.2s;
      position: relative;
    }
    .nav-link:hover {
      color: white;
      text-shadow: 0 0 8px var(--primary-glow);
    }
    .nav-link.active {
      color: white;
      background: rgba(14,165,233,0.2);
      box-shadow: 0 0 15px rgba(14,165,233,0.5);
    }

    /* 图片遮罩和自适应 */
    .img-cover {
      width: 100%;
      height: auto;
      object-fit: cover;
      border-radius: var(--radius-md);
    }
    .hero-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-bg::after {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 20% 30%, rgba(11,17,32,0.5) 0%, #0b1120 95%);
      backdrop-filter: blur(3px);
      -webkit-backdrop-filter: blur(3px);
    }

    /* FAQ 展开样式 */
    .faq-item summary {
      cursor: pointer;
      font-weight: 600;
      padding: 1rem 1.5rem;
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius-sm);
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-item[open] summary {
      background: rgba(14,165,233,0.1);
      border-left: 4px solid var(--primary);
    }
    .faq-content {
      padding: 0 1.5rem 1.2rem;
      color: var(--text-muted);
    }

    /* 响应式处理 */
    @media (max-width: 1024px) {
      .container { padding: 0 1.5rem; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .mobile-menu-btn { display: block; }
      .grid-cols-3 { grid-template-columns: 1fr; }
      .hero-title { font-size: 2.5rem; }
    }
    @media (min-width: 769px) {
      .mobile-menu-btn { display: none; }
    }