/* roulang page: index */
:root {
      --bg-base: #060B18;
      --bg-surface: #0A142F;
      --bg-card: rgba(15, 23, 42, 0.65);
      --primary-cyan: #00D2FF;
      --primary-mint: #00F5A0;
      --accent-purple: #7B2CBF;
      --accent-orange: #FF9E00;
      --text-main: #FFFFFF;
      --text-muted: #94A3B8;
      --text-dark: #64748B;
      --border-glow: rgba(0, 210, 255, 0.18);
      --border-hover: rgba(0, 245, 160, 0.45);
      --radius-base: 16px;
      --radius-sm: 10px;
      --radius-lg: 24px;
      --shadow-neon: 0 0 20px rgba(0, 210, 255, 0.4);
      --shadow-mint: 0 0 24px rgba(0, 245, 160, 0.35);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      scroll-behavior: smooth;
    }
    body {
      background-color: var(--bg-base);
      color: var(--text-main);
      font-family: 'Plus Jakarta Sans', 'Noto Sans SC', sans-serif;
      line-height: 1.65;
      overflow-x: hidden;
      background-image: radial-gradient(circle at 15% 10%, rgba(0, 210, 255, 0.08) 0%, transparent 40%),
                        radial-gradient(circle at 85% 60%, rgba(123, 44, 191, 0.08) 0%, transparent 45%);
    }
    .custom-container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .glass-nav {
      background: rgba(6, 11, 24, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-glow);
    }
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-base);
      transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .glass-card:hover {
      border-color: var(--border-hover);
      transform: translateY(-4px);
      box-shadow: 0 12px 30px rgba(0, 210, 255, 0.15);
    }
    .gradient-text {
      background: linear-gradient(135deg, #00D2FF 0%, #00F5A0 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .btn-neon {
      background: linear-gradient(135deg, #00D2FF 0%, #00F5A0 100%);
      color: #060B18;
      font-weight: 700;
      border-radius: 9999px;
      box-shadow: var(--shadow-neon);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-neon:hover {
      box-shadow: var(--shadow-mint);
      transform: translateY(-2px);
    }
    .btn-glass {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-glow);
      color: #FFFFFF;
      font-weight: 600;
      border-radius: 9999px;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-glass:hover {
      background: rgba(0, 210, 255, 0.12);
      border-color: var(--primary-cyan);
    }
    .badge-pill {
      background: rgba(0, 210, 255, 0.12);
      border: 1px solid rgba(0, 210, 255, 0.3);
      color: var(--primary-cyan);
      font-size: 0.75rem;
      padding: 4px 12px;
      border-radius: 9999px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .section-wrap {
      padding: 90px 0;
      position: relative;
    }
    .section-alt {
      background: linear-gradient(180deg, rgba(10, 20, 47, 0.4) 0%, rgba(6, 11, 24, 0.7) 100%);
      border-top: 1px solid rgba(255, 255, 255, 0.03);
      border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    }
    .tech-grid {
      background-size: 30px 30px;
      background-image: 
        linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    }
    details summary {
      cursor: pointer;
      list-style: none;
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    @media (max-width: 768px) {
      .section-wrap {
        padding: 56px 0;
      }
    }