body { font-family: sans-serif; display: flex; justify-content: center; align-items: center; height: 100vh; background-color: #f4f7f6; }
        .login-box { background: #fff; padding: 40px; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); text-align: center; }
        .btn-google { background: #4285F4; color: #fff; padding: 12px 24px; text-decoration: none; border-radius: 4px; font-weight: bold; display: inline-block; margin-top: 20px;}