body {
      margin: 0;
      font-family: 'Poppins', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: #e9f0f5;
      color: #222;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: start;
      padding: 20px;
    }

    .top-buttons {
      display: flex;
      gap: 15px;
      margin-bottom: 20px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .top-buttons a {
      background: #66c2b0;
      color: #fff;
      padding: 10px 20px;
      border-radius: 8px;
      text-decoration: none;
      font-weight: bold;
      transition: background 0.3s ease;
    }

    .top-buttons a:hover {
      background: #5ca0d3;
    }

    header {
      text-align: center;
      margin-top: 20px;
      margin-bottom: 20px;
    }

    header h1 {
      font-size: 2.8rem;
      color: #333;
      margin: 0;
    }

    header p {
      font-size: 1.2rem;
      color: #555;
    }

    .info {
      background: #fff;
      border-radius: 12px;
      padding: 25px;
      margin-top: 20px;
      margin-bottom: 30px;
      width: 100%;
      max-width: 800px;
      text-align: center;
      box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    }

    .info h2 {
      margin-bottom: 10px;
      font-size: 1.8rem;
      color: #444;
    }

    .info p {
      margin-bottom: 10px;
      color: #666;
      font-size: 1rem;
      line-height: 1.6;
    }

    .grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      width: 100%;
      max-width: 900px;
      margin-top: 10px;
    }

    .card {
      background: #ffffff;
      border-radius: 12px;
      padding: 25px;
      text-align: center;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      cursor: pointer;
      box-shadow: 0 2px 10px rgba(0,0,0,0.05);
      color: #333;
      text-decoration: none;
      font-size: 1.1rem;
      font-weight: 500;
    }

    .card:hover {
      transform: scale(1.04);
      box-shadow: 0 6px 20px rgba(0,0,0,0.1);
      background: #f9fbfc;
    }

    footer {
      margin-top: 40px;
      margin-bottom: 10px;
      font-size: 0.8rem;
      color: #888;
      text-align: center;
    }

    footer a {
      color: #5ca0d3;
      text-decoration: underline;
    }

    #auth-modal {
      position: fixed;
      top: 0; left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0,0,0,0.7);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      z-index: 9999;
      color: #fff;
      padding: 20px;
      text-align: center;
    }

    #auth-modal button {
      margin: 10px;
      padding: 12px 24px;
      border-radius: 8px;
      border: none;
      background: #66c2b0;
      color: #fff;
      font-weight: bold;
      font-size: 1rem;
      cursor: pointer;
      transition: background 0.3s ease;
    }

    #auth-modal button:hover {
      background: #5ca0d3;
    }

    #auth-modal h2 {
      margin-bottom: 10px;
      font-size: 2rem;
    }

    #auth-modal p {
      margin-bottom: 20px;
      font-size: 1.1rem;
    }

    #auth-modal .guest-btn {
      background: transparent;
      border: 2px solid #66c2b0;
      color: #66c2b0;
    }

    #auth-modal .guest-btn:hover {
      background: #5ca0d3;
      color: white;
    }