:root {
      --bg: #e6e6e6;
      --card: #ffffff;
      --text: #222;
      --muted: #666;
    }

    html, body {
      height: 100%;
      margin: 0;
      padding: 0;
    }

    body {
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--bg);
      font-family: Inter, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
      color: var(--text);
      text-align: center;
      padding: 16px;
    }

    .card {
      background: var(--card);
      border-radius: 16px;
      padding: 48px 36px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
      max-width: 600px;
      width: 100%;
      animation: fadeIn 1.5s ease forwards;
      opacity: 0;
    }

    .definition {
      font-size: 1.5rem;
      line-height: 1.6;
      margin-bottom: 24px;
    }

    .definition a {
      color: var(--text);
      text-decoration: none;
      font-weight: 600;
      border-bottom: 1px solid rgba(0, 0, 0, 0.3);
      transition: border-color 0.3s;
    }

    .definition a:hover {
      border-color: rgba(0, 0, 0, 0.6);
    }

    .source {
      color: var(--muted);
      font-size: 0.85rem;
    }

    @keyframes fadeIn {
      from {
        opacity: 0;
        transform: translateY(20px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @media (max-width: 600px) {
      .card {
        padding: 32px 24px;
      }
      .definition {
        font-size: 1.2rem;
      }
    }