body {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        .main-container {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
            padding: 40px;
            width: 100%;
            max-width: 500px;
            position: relative;
            overflow: hidden;
            animation: fadeInUp 0.6s ease;
        }

        .main-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #667eea, #764ba2);
        }

        /* 로그인된 상태 스타일 */
        .logged-in-section {
            text-align: center;
        }

        .user-avatar {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, #667eea, #764ba2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: white;
            font-size: 32px;
            font-weight: bold;
        }

        .user-info {
            background: #f8f9fa;
            border-radius: 15px;
            padding: 20px;
            margin: 20px 0;
        }

        .user-info-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 10px 0;
            border-bottom: 1px solid #e9ecef;
        }

        .user-info-item:last-child {
            border-bottom: none;
        }

        .user-info-label {
            font-weight: 600;
            color: #495057;
        }

        .user-info-value {
            color: #6c757d;
            font-family: monospace;
        }

        .level-badge {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            text-transform: uppercase;
        }

        .level-admin {
            background: linear-gradient(135deg, #ff6b6b, #ee5a52);
            color: white;
        }

        .level-basic {
            background: linear-gradient(135deg, #51cf66, #40c057);
            color: white;
        }

        .action-buttons {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
            margin-top: 25px;
        }

        .btn-action {
            padding: 12px 20px;
            border-radius: 10px;
            border: none;
            font-weight: 600;
            text-decoration: none;
            text-align: center;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .btn-main {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
        }

        .btn-logout {
            background: linear-gradient(135deg, #ffa726, #ff7043);
            color: white;
        }

        .btn-action:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
            color: white;
            text-decoration: none;
        }

        /* 로그인 폼 스타일 (기존과 동일) */
        .login-header {
            text-align: center;
            margin-bottom: 30px;
        }

        .login-header h2 {
            color: #333;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .login-header p {
            color: #666;
            font-size: 14px;
        }

        .form-group {
            margin-bottom: 25px;
            position: relative;
        }

        .form-group label {
            font-weight: 500;
            color: #555;
            margin-bottom: 8px;
            display: block;
        }

        .form-control {
            height: 50px;
            border: 2px solid #e1e5e9;
            border-radius: 10px;
            padding: 0 15px 0 45px;
            font-size: 16px;
            transition: all 0.3s ease;
            background: #fff;
        }

        .form-control:focus {
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
            outline: none;
        }

        .form-group .input-icon {
            position: absolute;
            left: 15px;
            top: 38px;
            color: #999;
            font-size: 18px;
        }

        .btn-login {
            width: 100%;
            height: 50px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border: none;
            border-radius: 10px;
            color: white;
            font-size: 16px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1px;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .btn-login:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
        }

        .alert {
            border-radius: 10px;
            margin-bottom: 25px;
            border: none;
            font-size: 14px;
        }

        .alert-danger {
            background: linear-gradient(135deg, #ff6b6b, #ee5a52);
            color: white;
        }

        .alert-success {
            background: linear-gradient(135deg, #51cf66, #40c057);
            color: white;
        }

        .form-options {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
            font-size: 14px;
        }

        .forgot-password {
            color: #667eea;
            text-decoration: none;
            font-weight: 500;
        }

        .login-footer {
            text-align: center;
            margin-top: 30px;
            padding-top: 30px;
            border-top: 1px solid #e1e5e9;
            color: #666;
            font-size: 14px;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* 반응형 */
        @media (max-width: 576px) {
            .main-container {
                margin: 20px;
                padding: 30px 25px;
            }
            
            .action-buttons {
                grid-template-columns: 1fr;
            }
        }