/* Reset ve temel stiller */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header h1 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

/* Navigation */
.nav {
    background: white;
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.nav a:hover, .nav a.active {
    background: #667eea;
    color: white;
}

/* Arama kutusu */
.search-container {
    margin-bottom: 2rem;
    text-align: center;
}

.search-box {
    width: 100%;
    max-width: 400px;
    padding: 12px 20px;
    font-size: 16px;
    border: 2px solid #ddd;
    border-radius: 25px;
    outline: none;
    transition: border-color 0.3s ease;
}

.search-box:focus {
    border-color: #667eea;
}

/* Kartlar */
.card {
    background: white;
    border-radius: 10px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.customer-card {
    cursor: pointer;
    border-left: 4px solid #667eea;
}

.customer-card h3 {
    color: #333;
    margin-bottom: 0.5rem;
}

.customer-card p {
    color: #666;
    margin-bottom: 0.3rem;
}

.customer-card .last-contact {
    font-size: 0.9rem;
    color: #999;
    font-style: italic;
}

/* Butonlar */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background: #667eea;
    color: white;
    text-decoration: none;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.3s ease;
    margin: 5px;
}

.btn:hover {
    background: #5a6fd8;
}

.btn-success {
    background: #28a745;
}

.btn-success:hover {
    background: #218838;
}

.btn-danger {
    background: #dc3545;
}

.btn-danger:hover {
    background: #c82333;
}

.btn-warning {
    background: #ffc107;
    color: #333;
}

.btn-warning:hover {
    background: #e0a800;
}

.btn-small {
    padding: 5px 10px;
    font-size: 12px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 2rem;
    border-radius: 10px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #eee;
}

.close {
    color: #aaa;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: #333;
}

/* Form stiller */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #333;
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* Listeler */
.list-group {
    list-style: none;
    margin-bottom: 1rem;
}

.list-group-item {
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-bottom: none;
    background: #f8f9fa;
}

.list-group-item:first-child {
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
}

.list-group-item:last-child {
    border-bottom: 1px solid #ddd;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
}

.list-group-item:nth-child(even) {
    background: white;
}

/* Responsive tasarım */
@media (max-width: 768px) {
    .container {
        padding: 0 10px;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
    
    .nav ul {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .nav a {
        display: block;
        text-align: center;
    }
    
    .modal-content {
        margin: 10% auto;
        padding: 1rem;
        width: 95%;
    }
    
    .card {
        padding: 1rem;
    }
}

/* Yükleme animasyonu */
.loading {
    text-align: center;
    padding: 2rem;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Uyarı mesajları */
.alert {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 5px;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

/* Tablo stiller */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

.table th,
.table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.table th {
    background: #f8f9fa;
    font-weight: 600;
}

.table tbody tr:hover {
    background: #f8f9fa;
}

/* Boş durum */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: #666;
}

.empty-state h3 {
    margin-bottom: 1rem;
    color: #999;
}

/* Tarih ve saat inputları */
.date-time-group {
    display: flex;
    gap: 1rem;
}

.date-time-group .form-group {
    flex: 1;
}

@media (max-width: 480px) {
    .date-time-group {
        flex-direction: column;
        gap: 0;
    }
}