/* roulang page: index */
:root {
      --brand-primary: #0F4C81;
      --brand-accent: #00D2B4;
      --brand-accent-hover: #00b89e;
      --bg-page: #F4F6F9;
      --bg-surface: #FFFFFF;
      --text-main: #1A202C;
      --text-muted: #4A5568;
      --text-sub: #718096;
      --border-color: rgba(226, 232, 240, 0.85);
      --shadow-card: 0 4px 20px -2px rgba(15, 76, 129, 0.06);
      --shadow-hover: 0 14px 30px -4px rgba(15, 76, 129, 0.12);
    }
    
    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-page);
      color: var(--text-main);
      overflow-x: hidden;
      line-height: 1.75;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
    }

    .brand-glass-nav {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }

    .badge-pulse {
      display: inline-block;
      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 cubic-bezier(0.66, 0, 0, 1);
    }

    @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);
      }
    }

    .card-elevated {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-card);
      border-radius: 1rem;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .card-elevated:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0, 210, 180, 0.4);
    }

    .btn-gradient {
      background: linear-gradient(135deg, #0F4C81 0%, #0c3d69 100%);
      color: #ffffff;
      transition: all 0.3s ease;
    }
    
    .btn-gradient:hover {
      background: linear-gradient(135deg, #135d9d 0%, #0F4C81 100%);
      transform: scale(1.02);
      box-shadow: 0 8px 20px -4px rgba(15, 76, 129, 0.35);
    }

    .btn-accent {
      background: var(--brand-accent);
      color: #0A0F1D;
      font-weight: 600;
      transition: all 0.3s ease;
    }

    .btn-accent:hover {
      background: var(--brand-accent-hover);
      transform: scale(1.02);
      box-shadow: 0 8px 20px -4px rgba(0, 210, 180, 0.4);
    }

    .hero-slide {
      opacity: 0;
      transition: opacity 0.8s ease-in-out;
      position: absolute;
      inset: 0;
      pointer-events: none;
    }

    .hero-slide.active {
      opacity: 1;
      pointer-events: auto;
      position: relative;
    }

    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }

    .faq-item.open .faq-content {
      max-height: 400px;
    }

    .faq-item.open .faq-icon {
      transform: rotate(180deg);
    }

    .hero-bg-overlay {
      background: linear-gradient(90deg, rgba(10, 15, 29, 0.94) 0%, rgba(15, 76, 129, 0.86) 60%, rgba(10, 15, 29, 0.72) 100%);
    }

    .tech-bg-gradient {
      background: linear-gradient(145deg, #0A0F1D 0%, #111A2E 100%);
    }