body {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .auth-card {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            padding: 40px;
            max-width: 400px;
            width: 100%;
        }
        .logo {
            font-size: 2rem;
            font-weight: bold;
            color: #667eea;
            text-align: center;
            margin-bottom: 30px;
        }
        .google-btn {
            background: #4285f4;
            border: none;
            color: white;
            padding: 12px 24px;
            border-radius: 8px;
            font-size: 16px;
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            transition: background 0.3s;
        }
        .google-btn:hover {
            background: #3367d6;
            color: white;
        }
        .loading {
            display: none;
        }
        .error-message {
            background: #f8d7da;
            border: 1px solid #f5c6cb;
            color: #721c24;
            padding: 12px;
            border-radius: 8px;
            margin-top: 15px;
        }