/* roulang page: index */
:root {
      --primary: #00F0FF;
      --dark: #0A0E17;
      --accent: #FF3C5A;
      --deep: #141B24;
      --soft: #F5F5F7;
      --text-main: #1A1A1A;
      --text-muted: #5A5A5A;
      --border-light: rgba(0,0,0,0.06);
      --radius: 12px;
      --radius-sm: 8px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--soft);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a, button, input {
      font-family: inherit;
    }

    .glass-nav {
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
    }

    .gradient-hero {
      background: linear-gradient(135deg, rgba(10,14,23,0.85) 0%, rgba(20,27,36,0.7) 100%);
    }

    .card-service {
      background: white;
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: 0 2px 20px rgba(0,0,0,0.04);
      border: 1px solid var(--border-light);
      transition: all 0.3s ease;
    }
    .card-service:hover {
      box-shadow: 0 12px 28px rgba(0,0,0,0.08);
      transform: translateY(-4px);
    }
    .service-icon {
      transition: transform 0.3s ease, color 0.3s ease;
      color: var(--primary);
    }
    .card-service:hover .service-icon {
      transform: rotate(5deg);
      color: #33F5FF;
    }

    .btn-primary {
      background: var(--primary);
      color: var(--dark);
      font-weight: 700;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      border: 2px solid transparent;
      box-shadow: 0 0 0 rgba(0,240,255,0);
    }
    .btn-primary:hover {
      background: #33F5FF;
      box-shadow: 0 0 20px rgba(0,240,255,0.4);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
      font-weight: 700;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: var(--dark);
      box-shadow: 0 0 16px rgba(0,240,255,0.3);
    }

    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
      text-shadow: 0 0 12px rgba(0,240,255,0.3);
    }

    .case-card {
      border-radius: 16px;
      overflow: hidden;
      background: #fff;
      box-shadow: 0 4px 24px rgba(0,0,0,0.05);
      transition: transform 0.3s ease;
      position: relative;
    }
    .case-card:hover {
      transform: translateY(-6px);
    }
    .case-img-wrap {
      height: 280px;
      overflow: hidden;
      position: relative;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.03);
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(to top, rgba(0,0,0,0.75), transparent);
      padding: 24px;
      color: white;
    }

    .faq-item {
      border-bottom: 1px solid #e5e5e5;
    }
    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 1.1rem;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #f9f9fb;
      border-radius: 8px;
      margin-bottom: 8px;
      padding: 0 16px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }
    .faq-dot {
      width: 10px;
      height: 10px;
      background: var(--primary);
      border-radius: 50%;
      flex-shrink: 0;
    }

    @media (max-width: 768px) {
      .stat-number {
        font-size: 36px;
      }
      .card-service {
        padding: 24px;
      }
      .case-img-wrap {
        height: 220px;
      }
    }

    .animate-glow-line {
      animation: moveGlow 3s infinite alternate ease-in-out;
    }
    @keyframes moveGlow {
      0% { opacity: 0.3; transform: translateX(0); }
      100% { opacity: 0.7; transform: translateX(30px); }
    }