:root {
    --primary-color: #007bff; --secondary-color: #f8f9fa; --text-color: #333;
    --border-color: #dee2e6; --card-bg: #fff; --shadow: 0 2px 4px rgba(0,0,0,0.1);
}
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background-color: var(--secondary-color); color: var(--text-color); margin: 0; padding: 20px; }
.container { max-width: 1200px; margin: 0 auto; }
header h1 { text-align: center; color: var(--primary-color); }
main { display: grid; grid-template-columns: 350px 1fr; gap: 20px; }
.card { background-color: var(--card-bg); border-radius: 8px; padding: 20px; box-shadow: var(--shadow); }
.form-section { grid-row: 1 / 3; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: bold; }
.form-group input { width: 100%; padding: 8px; box-sizing: border-box; border: 1px solid var(--border-color); border-radius: 4px; }
button { width: 100%; padding: 10px; background-color: var(--primary-color); color: white; border: none; border-radius: 4px; cursor: pointer; font-size: 16px; transition: opacity 0.2s; }
button:hover { opacity: 0.9; }
.secondary-btn { background-color: #6c757d; margin-top: 10px; }
.summary-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 20px; text-align: center; margin-bottom: 20px; }
.summary-cards h3 { margin-top: 0; color: #6c757d; }
.summary-cards p { font-size: 24px; font-weight: bold; color: var(--primary-color); margin-bottom: 0; }
.table-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 15px; flex-wrap: wrap; gap: 10px; }
.table-header h2 { margin: 0; }
.filters { display: flex; flex-wrap: wrap; gap: 15px; align-items: center; }
.date-range-filter { display: flex; align-items: center; gap: 5px; }
.date-range-filter input[type="date"] { padding: 6px; border: 1px solid var(--border-color); border-radius: 4px; }
#date-filter-btn { padding: 8px 12px; font-size: 14px; background-color: #17a2b8; border-color: #17a2b8; color: white; }
.filter-buttons button { padding: 8px 12px; margin-left: 5px; cursor: pointer; border: 1px solid var(--primary-color); background-color: white; color: var(--primary-color); border-radius: 4px; font-size: 14px; }
.filter-buttons button:hover, .filter-buttons button.active { background-color: var(--primary-color); color: white; }
#csv-indir-btn { background-color: #28a745; border-color: #28a745; color: white; padding: 8px 12px; font-size: 14px; }
table { width: 100%; border-collapse: collapse; margin-top: 20px; }
th, td { padding: 12px; border-bottom: 1px solid var(--border-color); text-align: left; }
thead { background-color: #e9ecef; }
.action-buttons button { background: none; border: none; cursor: pointer; font-size: 18px; padding: 5px; width: auto; }
.edit-btn { color: var(--primary-color); margin-right: 10px; }
.delete-btn { color: #dc3545; }
@media (max-width: 992px) {
    main { grid-template-columns: 1fr; }
    .form-section { grid-row: auto; }
}