:root {
      --bg-color: #f9fafb;
      --card-bg: #ffffff;
      --primary-color: #2563eb;
      --text-color: #1f2937;
      --text-muted: #6b7280;
      --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
      --radius: 16px;
    }

    body {
      margin: 0;
      font-family: 'Inter', sans-serif;
      background-color: var(--bg-color);
      color: var(--text-color);
    }

    header {
      background-color: var(--primary-color);
      color: white;
      padding: 2rem 1rem;
      text-align: center;
      box-shadow: var(--shadow);
    }

    header h1 {
      margin: 0;
      font-size: 2rem;
    }

    header p {
      margin-top: 0.5rem;
      font-size: 1rem;
      color: #dbeafe;
    }

    main {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 1.5rem;
      padding: 2rem;
      max-width: 1200px;
      margin: auto;
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding: 1.5rem;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
    }

    .card a {
      text-decoration: none;
      color: var(--primary-color);
      font-weight: 600;
      font-size: 1.2rem;
    }

    .description {
      margin-top: 0.75rem;
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    @media (max-width: 600px) {
      header h1 {
        font-size: 1.5rem;
      }

      .card a {
        font-size: 1.1rem;
      }
    }