:root {
            --primary: #007bff;
            --primary-hover: #0056b3;
            --success: #28a745;
            --success-hover: #218838;
            --bg: #f4f6f9;
            --text: #333;
            --card-bg: #ffffff;
            --border: #dee2e6;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: var(--bg);
            color: var(--text);
            margin: 0;
            padding: 30px 15px;
            display: flex;
            justify-content: center;
        }

        .window {
            background: var(--card-bg);
            width: 100%;
            max-width: 800px;
            border-radius: 12px;
            box-shadow: 0 8px 24px rgba(0,0,0,0.08);
            overflow: hidden;
            border: 1px solid var(--border);
        }

        .header {
            background: var(--primary);
            color: white;
            padding: 20px 25px;
        }

        .header h1 {
            margin: 0;
            font-size: 24px;
            font-weight: 600;
        }

        .header p {
            margin: 5px 0 0 0;
            font-size: 14px;
            opacity: 0.9;
        }

        .content {
            padding: 25px;
        }

        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 25px;
        }

        @media (max-width: 600px) {
            .grid-2 { grid-template-columns: 1fr; }
        }

        .section-title {
            font-size: 16px;
            font-weight: 600;
            color: #495057;
            margin-bottom: 15px;
            border-bottom: 2px solid var(--border);
            padding-bottom: 5px;
            grid-column: span 2;
        }

        @media (max-width: 600px) {
            .section-title { grid-column: span 1; }
        }

        .form-group {
            display: flex;
            flex-direction: column;
        }

        .form-group label {
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 6px;
            color: #6c757d;
        }

        .form-group input {
            padding: 10px 12px;
            font-size: 14px;
            border: 1px solid var(--border);
            border-radius: 6px;
            outline: none;
            transition: border-color 0.2s;
        }

        .form-group input:focus {
            border-color: var(--primary);
        }

        .table-container {
            margin-bottom: 25px;
            border: 1px solid var(--border);
            border-radius: 6px;
            overflow: hidden;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
        }

        th {
            background: #f8f9fa;
            color: #495057;
            text-align: left;
            padding: 12px;
            font-weight: 600;
            border-bottom: 1px solid var(--border);
        }

        td {
            padding: 10px 12px;
            border-bottom: 1px solid var(--border);
        }

        tr:last-child td {
            border-bottom: none;
        }

        .input-table {
            width: 100%;
            border: none;
            padding: 6px;
            box-sizing: border-box;
            background: transparent;
        }

        .input-table:focus {
            background: #f1f3f5;
            outline: none;
            border-radius: 4px;
        }

        .actions {
            display: flex;
            justify-content: flex-end;
            padding-top: 15px;
            border-top: 1px solid var(--border);
        }

        .btn {
            background: var(--success);
            color: white;
            border: none;
            padding: 12px 30px;
            font-size: 15px;
            font-weight: 600;
            border-radius: 6px;
            cursor: pointer;
            transition: background 0.2s;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .btn:hover {
            background: var(--success-hover);
        }