body {
            background-color: #f3f6f9;
            font-family: 'Inter', sans-serif;
            color: #344767;
        }

        .main-card {
            border: none;
            border-radius: 16px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
            background: #fff;
        }

        .header-title {
            font-weight: 800;
            color: #1a1f36;
            letter-spacing: -0.5px;
        }

        .form-label {
            font-size: 0.75rem;
            font-weight: 700;
            color: #697a8d;
            text-transform: uppercase;
            margin-bottom: 5px;
        }

        .form-control,
        .form-select {
            border-radius: 8px;
            border: 1px solid #e0e6ed;
            padding: 10px;
            font-weight: 600;
            font-size: 0.9rem;
        }

        .form-control:focus,
        .form-select:focus {
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
            border-color: #4361ee;
        }

        /* Tablo Stilleri */
        .preview-container {
            border: 2px solid #e0e6ed;
            border-radius: 12px;
            overflow: hidden;
            background: #fff;
        }

        .excel-table {
            width: 100%;
            border-collapse: collapse;
            font-family: 'Calibri', sans-serif;
            font-size: 14px;
        }

        .excel-table th {
            background: #f8f9fa;
            border: 1px solid #c7c7c7;
            padding: 8px;
            text-align: center;
            color: #444;
        }

        .excel-table td {
            border: 1px solid #c7c7c7;
            padding: 8px;
            vertical-align: middle;
        }

        .excel-table .col-a {
            width: 28.5%;
            text-align: center;
            font-weight: bold;
        }

        .excel-table .col-b {
            width: 23.4%;
            text-align: center;
            font-weight: bold;
        }

        .excel-table .col-c {
            width: 15.0%;
            text-align: center;
        }

        .excel-table .col-d {
            width: 33.1%;
            text-align: left;
            font-weight: bold;
        }

        .btn-action {
            border-radius: 10px;
            font-weight: 700;
            padding: 12px 24px;
            transition: all 0.3s;
        }

        .btn-primary {
            background: #4361ee;
            border: none;
        }

        .btn-primary:hover {
            background: #3a53d0;
            transform: translateY(-2px);
        }

        .btn-move {
            padding: 4px 10px;
            font-size: 0.9rem;
            border-radius: 6px;
            cursor: pointer;
        }

        .total-badge {
            background: #212529;
            color: #fff;
            padding: 10px 20px;
            border-radius: 8px;
            font-size: 1.1rem;
        }

        .date-select-group {
            display: flex;
            gap: 5px;
        }

        .period-group {
            background: #f8f9fa;
            padding: 10px;
            border-radius: 8px;
            border: 1px solid #e0e6ed;
        }