/* Genel Ayarlar */
:root {
    --primary-color: #007bff;
    --danger-color: #dc3545;
    --background-color: #f4f7f6;
    --container-bg: #ffffff;
    --text-color: #333;
    --border-color: #dee2e6;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    background-color: var(--background-color);
    color: var(--text-color);
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}
/* Butonlar */
.btn {
    padding: 10px 15px;
    border: none;
    border-radius: 5px;
    color: white;
    cursor: pointer;
    font-size: 16px;
    text-decoration: none;
}
.btn-primary { background-color: var(--primary-color); }
.btn-danger { background-color: var(--danger-color); }

/* Login Sayfası */
.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 40px;
    background-color: var(--container-bg);
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
.login-container h1 { text-align: center; margin-bottom: 20px; }

/* Form Elemanları */
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; }
.form-group input, .form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    box-sizing: border-box;
}
.form-group-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }

/* Dashboard Sayfası */
header {
    background-color: var(--container-bg);
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}
header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }

/* Tablo */
.table-wrapper { overflow-x: auto; }
table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--container-bg);
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}
th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
thead { background-color: #f8f9fa; }
tbody tr:hover { background-color: #f1f1f1; }

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    display: none; /* JS ile flex yapılacak */
    justify-content: center;
    align-items: center;
}
.modal-content {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    position: relative;
}
.close-btn {
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 28px;
    cursor: pointer;
}
.error-message {
    padding: 10px;
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    border-radius: 5px;
    margin-bottom: 15px;
    display: none; /* Başlangıçta gizli */
}
.btn-action {
    padding: 5px 10px;
    margin-right: 5px;
    border-radius: 4px;
    cursor: pointer;
    border: 1px solid var(--border-color);
}
.btn-edit { background-color: #ffc107; }
.btn-delete { background-color: #dc3545; color: white; }
.btn-secondary.active {
    background: #4a5568;
    color: white;
}