* { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }
        .login-container {
            background: white;
            border-radius: 20px;
            padding: 30px 25px;
            width: 100%;
            max-width: 400px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
        }
        .logo {
            text-align: center;
            margin-bottom: 25px;
        }
        .logo h1 {
            color: #2c3e50;
            font-size: 1.4em;
            margin-bottom: 8px;
        }
        .logo .version {
            display: inline-block;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 5px 15px;
            border-radius: 15px;
            font-size: 0.8em;
        }
        .form-group {
            margin-bottom: 18px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #2c3e50;
            font-weight: 500;
            font-size: 14px;
        }
        .form-group input {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 16px;
            transition: border-color 0.3s;
            -webkit-appearance: none;
        }
        .form-group input:focus {
            outline: none;
            border-color: #667eea;
        }
        .btn {
            width: 100%;
            padding: 14px;
            border: none;
            border-radius: 10px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            margin-top: 10px;
        }
        .btn-primary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
        }
        .btn-primary:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }
        .divider {
            text-align: center;
            margin: 20px 0;
            color: #999;
        }
        .register-link {
            text-align: center;
            color: #666;
        }
        .register-link a {
            color: #667eea;
            text-decoration: none;
            font-weight: 600;
        }
        .register-link a:hover {
            text-decoration: underline;
        }
        .error-message {
            background: #fee;
            color: #c33;
            padding: 10px 15px;
            border-radius: 8px;
            margin-bottom: 20px;
            display: none;
        }
        /* 账号禁用时的特殊样式 */
        .error-message--disabled {
            background: #fff3e0;
            color: #e65100;
            border-left: 4px solid #ff9800;
        }
        .loading {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255,255,255,0.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 1s linear infinite;
            margin-right: 10px;
        }
        @keyframes spin {
            to { transform: rotate(360deg); }
        }