/* roulang page: index */
:root {
      --brand-primary: #4F46E5;
      --brand-cyan: #06B6D4;
      --brand-dark: #0F172A;
      --brand-surface: #0B0F19;
      --bg-base: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-subtle: #E2E8F0;
      --radius-lg: 16px;
      --radius-xl: 24px;
      --shadow-card: 0 10px 30px -5px rgba(15, 23, 42, 0.06);
      --shadow-hover: 0 20px 40px -10px rgba(79, 70, 229, 0.15);
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--bg-base);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .gradient-hero-overlay {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 27, 75, 0.85) 60%, rgba(6, 182, 212, 0.75) 100%);
    }
    .text-gradient {
      background: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .text-gradient-light {
      background: linear-gradient(135deg, #FFFFFF 0%, #BAE6FD 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .card-modern {
      background: var(--card-bg);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-xl);
      box-shadow: var(--shadow-card);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-modern:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(79, 70, 229, 0.3);
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      padding: 0.25rem 0.875rem;
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 600;
      background: rgba(79, 70, 229, 0.08);
      color: #4338CA;
      border: 1px solid rgba(79, 70, 229, 0.2);
    }
    .badge-dark-pill {
      display: inline-flex;
      align-items: center;
      padding: 0.25rem 0.875rem;
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 600;
      background: rgba(6, 182, 212, 0.12);
      color: #38BDF8;
      border: 1px solid rgba(6, 182, 212, 0.3);
    }
    .btn-gradient {
      background: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
      color: #FFFFFF;
      transition: all 0.3s ease;
    }
    .btn-gradient:hover {
      opacity: 0.95;
      box-shadow: 0 10px 25px -5px rgba(79, 70, 229, 0.4);
      transform: translateY(-2px);
    }
    .pulse-indicator {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: #10B981;
      box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
      animation: pulse-ring 1.8s infinite;
    }
    @keyframes pulse-ring {
      0% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
      }
      70% {
        box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
      }
      100% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
      }
    }
    details > summary {
      list-style: none;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary .faq-icon {
      transform: rotate(180deg);
    }