:root {
    /* Terder.org kurumsal renklerini buraya girebilirsiniz */
    --primary-color: #1a4b82; 
    --secondary-color: #f39c12; 
    --bg-color: #f8f9fa;
    --panel-bg: #ffffff;
    --text-dark: #333333;
    --text-light: #666666;
    --border-color: #e0e0e0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-dark);
    margin: 0;
    padding: 0;
}

.main-container {
    max-width: 1400px;
    margin: 25px auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.filter-panel, .table-panel {
    background-color: var(--panel-bg);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.filter-panel h2 {
    margin-top: 0;
    color: var(--primary-color);
    font-size: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.filter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 440px));
    gap: 15px;
}

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

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-light);
}

.form-group input, .form-group select {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.3s;
}

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

.range-inputs {
    display: flex;
    align-items: center;
    gap: 5px;
}

.range-inputs input {
    width: 100%;
}

.form-actions {
    grid-column: 1 / -1;
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    margin-top: 10px;
}

button {
    padding: 10px 25px;
    border: none;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s, transform 0.1s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: #12355c;
}

.btn-secondary {
    background-color: #e0e0e0;
    color: var(--text-dark);
}

.btn-secondary:hover {
    background-color: #c8c8c8;
}