/* Basic reset */
    * {
      box-sizing: border-box;
      margin: 0; padding: 0;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    }

    body, html {
      min-height: 100vh;
      background: linear-gradient(135deg, #2980b9, #6dd5fa);
      color: #333;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      padding: 40px 20px;
    }

    header {
      margin-bottom: 40px;
      text-align: center;
      color: white;
    }

    header h1 {
      font-size: 3rem;
      margin-bottom: 10px;
      text-shadow: 1px 1px 3px rgba(0,0,0,0.3);
    }

    header p {
      font-size: 1.2rem;
      max-width: 600px;
      margin: 0 auto;
      text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
    }

    main {
      max-width: 900px;
      background: white;
      border-radius: 12px;
      padding: 30px 40px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.15);
      color: #444;
    }

    .login-btn {
      display: inline-block;
      background-color: #2980b9;
      color: white;
      padding: 14px 28px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
      text-decoration: none;
      margin-bottom: 30px;
      transition: background-color 0.3s ease;
    }
    
    .login-btn:hover {
      background-color: #1b5f8a;
    }

    section.content {
      font-size: 1rem;
      line-height: 1.6;
    }

    /* Responsive */
    @media (max-width: 600px) {
      header h1 {
        font-size: 2.2rem;
      }
      main {
        padding: 20px;
      }
      .login-btn {
        padding: 12px 24px;
        font-size: 1rem;
      }
    }