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

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 20px;
    }

    .login-container {
      background: white;
      border-radius: 20px;
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
      padding: 40px;
      width: 100%;
      max-width: 400px;
      animation: slideUp 0.5s ease;
    }

    @keyframes slideUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .logo {
      text-align: center;
      margin-bottom: 30px;
    }

    .logo h1 {
      color: #667eea;
      font-size: 28px;
      font-weight: 700;
      margin-bottom: 5px;
    }

    .logo p {
      color: #6b7280;
      font-size: 14px;
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      color: #374151;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .form-group input {
      width: 100%;
      padding: 12px 15px;
      border: 2px solid #e5e7eb;
      border-radius: 10px;
      font-size: 15px;
      transition: all 0.3s ease;
      outline: none;
    }

    .form-group input:focus {
      border-color: #667eea;
      box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    }

    .btn-login {
      width: 100%;
      padding: 14px;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      color: white;
      border: none;
      border-radius: 10px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      margin-top: 10px;
    }

    .btn-login:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
    }

    .btn-login:active {
      transform: translateY(0);
    }

    .btn-login:disabled {
      opacity: 0.6;
      cursor: not-allowed;
      transform: none;
    }

    .error-message {
      background: #fee;
      color: #c00;
      padding: 12px;
      border-radius: 8px;
      margin-bottom: 20px;
      font-size: 14px;
      display: none;
      animation: shake 0.3s ease;
    }

    @keyframes shake {
      0%, 100% { transform: translateX(0); }
      25% { transform: translateX(-10px); }
      75% { transform: translateX(10px); }
    }

    .error-message.show {
      display: block;
    }

    .footer {
      text-align: center;
      margin-top: 20px;
      color: #9ca3af;
      font-size: 12px;
    }