/* Reset default login styles */
        :root {
            --primary-color: #2ecc71;
            --secondary-color: #27ae60;
            --text-color: #333;
            --light-gray: #f8f9fa;
            --border-color: #e0e0e0;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        body {
            background: linear-gradient(135deg, #f5f7fb 0%, #e8f5e9 100%);
            color: var(--text-color);
             justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }
        .demo-accounts{
       display: none;
     }
        .login-container {
            width: 100%;
            max-width: 420px;
            background: white;
            border-radius: 16px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
            overflow: hidden;
            margin: 30px auto;
        }
        .login-header {
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 35px 30px;
            text-align: center;
            position: relative;
        }
        .login-header h1 {
            font-size: 28px;
            margin-bottom: 10px;
            font-weight: 600;
        }
        .login-header p {
            opacity: 0.9;
            font-size: 16px;
        }
        .login-header::after {
            content: '';
            position: absolute;
            bottom: -20px;
            left: 50%;
            transform: translateX(-50%);
            width: 40px;
            height: 40px;
            background: white;
            border-radius: 50%;
            box-shadow: 0 -5px 10px rgba(0, 0, 0, 0.05);
        }
        .login-header::before {
            content: '\f2bd';
            font-family: 'Font Awesome 5 Free';
            font-weight: 900;
            position: absolute;
            bottom: -30px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 60px;
            background: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: white;
            z-index: 2;
            box-shadow: 0 5px 15px rgba(46, 204, 113, 0.4);
        }
        .login-form {
            padding: 50px 30px 30px;
        }
        .form-group {
            margin-bottom: 25px;
        }
        .form-group label {
            display: block;
            margin-bottom: 10px;
            font-weight: 500;
            color: #555;
            font-size: 15px;
        }
        .input-with-icon {
            position: relative;
        }
        .input-with-icon i {
            position: absolute;
            left: 18px;
            top: 50%;
            transform: translateY(-50%);
            color: #999;
            font-size: 18px;
        }
        .input-with-icon input {
            width: 100%;
            padding: 16px 20px 16px 55px;
            border: 2px solid var(--border-color);
            border-radius: 12px;
            font-size: 16px;
            transition: all 0.3s ease;
        }
        .input-with-icon input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.2);
        }
        .remember-forgot {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
        }
        .remember-me {
            display: flex;
            align-items: center;
        }
        .remember-me input {
            margin-right: 10px;
            width: 18px;
            height: 18px;
            accent-color: var(--primary-color);
        }
        .forgot-password {
            color: var(--primary-color);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
        }
        .forgot-password:hover {
            
        }
        .login-button {
            width: 100%;
            background: var(--primary-color);
            color: white;
            border: none;
            padding: 18px;
            border-radius: 12px;
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(46, 204, 113, 0.3);
        }
        .login-button:hover {
            background: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 7px 20px rgba(46, 204, 113, 0.4);
        }
        .login-button:active {
            transform: translateY(0);
        }
        .login-button.loading {
            background: #95a5a6;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }
        .login-button.loading i {
            margin-right: 10px;
            animation: spin 1s infinite linear;
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        .signup-link {
            text-align: center;
            margin-top: 25px;
            font-size: 15px;
            color: #666;
        }
        .signup-link a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
        }
        .signup-link a:hover {
            
        }
        .error-message {
            color: #e74c3c;
            font-size: 14px;
            margin-top: 8px;
            display: none;
        }
        .demo-accounts {
            background: rgba(46, 204, 113, 0.1);
            border-radius: 12px;
            padding: 20px;
            margin-top: 30px;
            border-left: 4px solid var(--primary-color);
        }
        .demo-accounts h3 {
            color: var(--primary-color);
            margin-bottom: 15px;
            font-size: 16px;
            display: flex;
            align-items: center;
        }
        .demo-accounts h3 i {
            margin-right: 10px;
        }
        .account-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }
        .account-item {
            background: white;
            padding: 12px;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
        }
        .account-item strong {
            color: var(--primary-color);
            display: block;
            margin-bottom: 5px;
            font-size: 14px;
        }
        .account-item span {
            font-size: 13px;
            color: #666;
            word-break: break-all;
        }
        /* 响应式设计 */
        @media (max-width: 480px) {
            .login-container {
                border-radius: 12px;
            }
            .login-form {
                padding: 40px 20px 20px;
            }
            .account-list {
                grid-template-columns: 1fr;
            }
        }