/* 弹框样式 */
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.7);
            display: none;
            justify-content: center;
            align-items: center;
            z-index: 1000;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        
        .modal-overlay.active {
            opacity: 1;
            display: flex;
        }
        
        .modal-content {
            background-color: white;
            width: 90%;
            max-width: 450px;
            border-radius: 15px;
            overflow: hidden;
            transform: translateY(-30px);
            transition: transform 0.4s ease;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
        }
        
        .modal-overlay.active .modal-content {
            transform: translateY(0);
        }
        
        .modal-header {
            background: linear-gradient(to right, #a54a4a, #c56c6c);
            color: white;
            padding: 25px 20px;
            text-align: center;
            position: relative;
        }
        
        .modal-header h2 {
            font-size: 1.8rem;
            font-weight: 600;
        }
        
        .close-btn {
            position: absolute;
            top: 15px;
            right: 20px;
            background: transparent;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            line-height: 1;
            transition: transform 0.2s;
        }
        
        .close-btn:hover {
            transform: scale(1.2);
        }
        
        .modal-body {
            padding: 30px;
        }
        input::placeholder{
            font-size: 0.9rem;
            /* line-height: 1.0; */
        }
        .form-group {
            margin-bottom: 25px;
            text-align: left;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #555;
            font-weight: 500;
            font-size: 0.95rem;
        }
        
        .input-with-icon {
            position: relative;
        }
        
        .input-with-icon i {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: #777;
            font-size: 1.1rem;
        }
        
        .form-control {
            width: 100%;
            padding: 15px 15px 15px 45px;
            border: 2px solid #e1e5eb;
            border-radius: 8px;
            font-size: 1rem;
            transition: all 0.3s;
        }
        
        .form-control:focus {
            border-color: #4a6fa5;
            outline: none;
            box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.2);
        }
        
        .form-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 10px;
            font-size: 0.9rem;
        }
        
        .remember-me {
            display: flex;
            align-items: center;
        }
        
        .remember-me input {
            margin-right: 8px;
        }
        
        .forgot-password {
            color: #4a6fa5;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .forgot-password:hover {
            color: #3a5a8a;
            text-decoration: underline;
        }
        
        .submit-btn {
            width: 100%;
            padding: 16px;
            background: linear-gradient(to right, #a54a4a, #c56c6c);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            margin-top: 10px;
        }
        
        .submit-btn:hover {
            background: linear-gradient(to right, #8a3a3a, #b55b5b);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(74, 111, 165, 0.3);
        }
        
        .submit-btn:active {
            transform: translateY(0);
        }
        
        .signup-link {
            text-align: center;
            margin-top: 25px;
            color: #666;
            font-size: 0.95rem;
        }
        
        .signup-link a {
            color: #4a6fa5;
            text-decoration: none;
            font-weight: 600;
            transition: color 0.3s;
        }
        
        .signup-link a:hover {
            color: #3a5a8a;
            text-decoration: underline;
        }
        
        .error-message {
            color: #e74c3c;
            font-size: 0.85rem;
            margin-top: 5px;
            display: none;
        }
        
        /* 响应式调整 */
        @media (max-width: 600px) {
           
            .modal-body {
                padding: 20px;
            }
            
            .form-footer {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }
        }