/* Login Container */
        .login-section { 
            margin-top: 50px; 
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%); 
            padding: 80px 20px; min-height: 70vh; display: flex; justify-content: center; align-items: center;
        }
        .login-card {
            background: white; padding: 35px; border-radius: 15px; box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            width: 100%; max-width: 400px; text-align: center;
        }
        .login-card input { width: 100%; padding: 12px; margin: 8px 0; border: 1px solid #ddd; border-radius: 8px; box-sizing: border-box; }
        .btn-signup { background: var(--primary); color: white; border: none; padding: 14px; width: 100%; border-radius: 50px; font-weight: bold; cursor: pointer; font-size: 16px; margin-top: 10px; }
        
        .error-alert { background: #fee2e2; color: #b91c1c; padding: 10px; border-radius: 8px; margin-bottom: 15px; font-size: 13px; text-align: left; border-left: 4px solid #ef4444; }