:root {
      --bg: linear-gradient(135deg, #dbeeff, #eaf7ff);
      --card-bg: rgba(255, 255, 255, 0.4);
      --card-border: rgba(200, 230, 255, 0.6);
      --hover-bg: rgba(255, 255, 255, 0.6);
      --text-color: #2c3e50;
      --accent: #8ecae6;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
      background: var(--bg);
      color: var(--text-color);
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 2rem;
      min-height: 100vh;
    }

    header {
      text-align: center;
      margin-bottom: 3rem;
    }

    header h1 {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--accent);
    }

    header p {
      font-size: 1.1rem;
      margin-top: 0.5rem;
      color: #506070;
    }

    section {
      width: 100%;
      max-width: 1000px;
      margin-bottom: 3rem;
    }

    section h2 {
      font-size: 1.8rem;
      margin-bottom: 1.5rem;
      color: var(--accent);
      border-bottom: 2px solid var(--accent);
      padding-bottom: 0.5rem;
    }

    .amazon-banner {
      display: inline-block;
      background: var(--accent);
      color: white;
      padding: 0.75rem 1.25rem;
      border-radius: 8px;
      text-decoration: none;
      font-weight: 600;
      margin-bottom: 1.5rem;
      box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
      transition: background 0.3s ease;
    }

    .amazon-banner:hover {
      background: #61bfe4;
    }

    .product-list {
      list-style: none;
      padding-left: 0;
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }

    .product-list li {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      backdrop-filter: blur(6px);
      padding: 1rem 1.25rem;
      border-radius: 10px;
      box-shadow: 0 2px 8px rgba(140, 180, 210, 0.2);
    }

    .product-list a {
      font-size: 0.95rem;
      color: var(--accent);
      text-decoration: underline;
    }

    .product-list a:hover {
      text-decoration: none;
    }

    footer {
      margin-top: auto;
      padding-top: 2rem;
      text-align: center;
      font-size: 0.85rem;
      color: #7a8ca0;
    }

    @media (max-width: 600px) {
      header h1 {
        font-size: 2rem;
      }
    }