/* roulang page: index */
:root {
      --primary: #0A0F1E;
      --accent1: #00F0FF;
      --accent2: #FF3CAC;
      --bg: #0A0F1E;
      --card-bg: #141B2D;
      --input-bg: #1C253A;
      --border: #2A3450;
      --text-body: #B0C4DE;
      --text-muted: #6B7A90;
      --text-white: #FFFFFF;
      --gradient-main: linear-gradient(135deg, var(--accent1), var(--accent2));
      --shadow-card: 0 4px 20px rgba(0,0,0,0.4);
      --shadow-glow: 0 20px 40px rgba(0,240,255,0.15);
      --radius-xl: 20px;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 10px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    .gradient-text {
      background: var(--gradient-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .glass-nav {
      background: rgba(10, 15, 30, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,240,255,0.2);
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-xl);
      border: 1px solid rgba(0,240,255,0.15);
      box-shadow: var(--shadow-card);
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    }
    .card:hover {
      transform: translateY(-6px);
      border-color: rgba(0,240,255,0.5);
      box-shadow: 0 20px 40px rgba(0,240,255,0.2);
    }
    .btn-primary {
      background: var(--gradient-main);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-md);
      padding: 14px 32px;
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
      box-shadow: 0 8px 20px rgba(255,60,172,0.3);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 12px 28px rgba(255,60,172,0.5);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--accent1);
      color: var(--accent1);
      font-weight: 600;
      border-radius: var(--radius-md);
      padding: 14px 32px;
      cursor: pointer;
      transition: all 0.25s ease;
    }
    .btn-secondary:hover {
      background: rgba(0,240,255,0.15);
      border-color: var(--accent2);
      color: var(--accent2);
    }
    .badge {
      background: rgba(0,240,255,0.15);
      color: var(--accent1);
      border-radius: 50px;
      padding: 6px 16px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    .pill-badge {
      background: var(--gradient-main);
      color: white;
      border-radius: 50px;
      padding: 4px 14px;
      font-size: 0.75rem;
      font-weight: 700;
    }
    .nav-link {
      color: var(--text-body);
      transition: color 0.2s;
      position: relative;
    }
    .nav-link:hover {
      color: white;
    }
    .nav-link.active {
      color: white;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--gradient-main);
      border-radius: 2px;
    }
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    @media (max-width: 1024px) {
      .masonry {
        columns: 2;
      }
    }
    @media (max-width: 768px) {
      .masonry {
        columns: 1;
      }
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
    }
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      border: 1px solid transparent;
      transition: border 0.2s;
    }
    .faq-item.active {
      border-color: rgba(0,240,255,0.3);
    }
    .faq-question {
      padding: 20px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 20px 20px;
    }
    .footer-link {
      color: var(--text-muted);
      transition: color 0.2s;
    }
    .footer-link:hover {
      color: var(--accent1);
    }
    @media (max-width: 768px) {
      .hero-container {
        flex-direction: column;
      }
      .grid-4 {
        grid-template-columns: repeat(2,1fr);
      }
    }
    @media (max-width: 480px) {
      .grid-4 {
        grid-template-columns: 1fr;
      }
    }