/* RivaSpor - Modern Spor Kursu Yönetim Sistemi */
:root {
    --primary-color: #1a1a1a;
    --secondary-color: #d4af37;
    --accent-color: #f5f5f5;
    --text-color: #333;
    --border-color: #ddd;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-bg: #f8f9fa;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-lg: 0 5px 20px rgba(0,0,0,0.15);
}

[data-theme="dark"] {
    --primary-color: #d4af37;
    --secondary-color: #1a1a1a;
    --accent-color: #2d2d2d;
    --text-color: #e0e0e0;
    --border-color: #444;
    --light-bg: #1e1e1e;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--light-bg);
    color: var(--text-color);
    line-height: 1.6;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.main-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #2d2d2d 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-img {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 20px;
}

.user-name {
    font-size: 0.95rem;
}

.theme-toggle {
    background: rgba(255,255,255,0.1);
    border: none;
    color: white;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.theme-toggle:hover {
    background: rgba(255,255,255,0.2);
}

.btn-logout {
    background: var(--danger-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s;
}

.btn-logout:hover {
    background: #c82333;
    transform: translateY(-2px);
}

/* Navigation */
.main-nav {
    background: white;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    padding: 10px 0;
}

.nav-menu li a {
    display: block;
    padding: 12px 20px;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s;
    font-weight: 500;
}

.nav-menu li a:hover,
.nav-menu li a.active {
    background: var(--primary-color);
    color: white;
}

/* Cards */
.card {
    background: white;
    border-radius: 10px;
    box-shadow: var(--shadow);
    padding: 25px;
    margin-bottom: 25px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--secondary-color);
}

.card-title {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 600;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background: #2d2d2d;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

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

.btn-danger {
    background: var(--danger-color);
    color: white;
}

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

.btn-warning {
    background: var(--warning-color);
    color: #333;
}

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

.btn-info {
    background: var(--info-color);
    color: white;
}

.btn-info:hover {
    background: #138496;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-icon {
    padding: 8px 12px;
}

/* Table */
.table-responsive {
    overflow-x: auto;
    margin-top: 20px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.data-table thead {
    background: var(--primary-color);
    color: white;
}

.data-table th,
.data-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table tbody tr:hover {
    background: var(--light-bg);
}

.data-table .actions {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.6);
    overflow-y: auto;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-content {
    background: white;
    border-radius: 10px;
    width: 100%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: 20px 25px;
    border-bottom: 2px solid var(--secondary-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.4rem;
    color: var(--primary-color);
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-color);
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s;
}

.modal-close:hover {
    background: var(--danger-color);
    color: white;
}

.modal-body {
    padding: 25px;
}

.modal-footer {
    padding: 20px 25px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* Form */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.form-label.required::after {
    content: ' *';
    color: var(--danger-color);
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 0.95rem;
    transition: all 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.form-control:disabled {
    background: var(--light-bg);
    cursor: not-allowed;
}

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

select.form-control {
    cursor: pointer;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.form-text {
    font-size: 0.85rem;
    color: #666;
    margin-top: 5px;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}

.stat-icon.primary {
    background: linear-gradient(135deg, var(--primary-color), #2d2d2d);
    color: white;
}

.stat-icon.success {
    background: linear-gradient(135deg, var(--success-color), #1e7e34);
    color: white;
}

.stat-icon.warning {
    background: linear-gradient(135deg, var(--warning-color), #d39e00);
    color: white;
}

.stat-icon.danger {
    background: linear-gradient(135deg, var(--danger-color), #bd2130);
    color: white;
}

.stat-content h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-content p {
    color: #666;
    font-size: 0.9rem;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.badge-success {
    background: #d4edda;
    color: #155724;
}

.badge-danger {
    background: #f8d7da;
    color: #721c24;
}

.badge-warning {
    background: #fff3cd;
    color: #856404;
}

.badge-info {
    background: #d1ecf1;
    color: #0c5460;
}

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: 5px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border-left: 4px solid var(--success-color);
}

.alert-danger {
    background: #f8d7da;
    color: #721c24;
    border-left: 4px solid var(--danger-color);
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border-left: 4px solid var(--warning-color);
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border-left: 4px solid var(--info-color);
}

/* Search & Filter */
.search-filter-bar {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.search-box {
    flex: 1;
    min-width: 250px;
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 10px 40px 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

.search-box::after {
    content: '🔍';
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
}

.filter-group {
    display: flex;
    gap: 10px;
    align-items: center;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 5px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.pagination a,
.pagination span {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s;
}

.pagination a:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pagination .active {
    background: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, #2d2d2d 100%);
    padding: 20px;
}

.login-card {
    background: white;
    border-radius: 15px;
    padding: 40px;
    width: 100%;
    max-width: 450px;
    box-shadow: var(--shadow-lg);
}

.login-logo {
    text-align: center;
    margin-bottom: 30px;
}

.login-logo img {
    width: 80px;
    height: 80px;
    object-fit: contain;
    margin-bottom: 15px;
}

.login-logo h1 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 5px;
}

.login-logo p {
    color: #666;
    font-size: 0.95rem;
}

/* Public Form (Başvuru) */
.public-container {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, #2d2d2d 100%);
    padding: 40px 20px;
}

.public-card {
    background: white;
    border-radius: 15px;
    padding: 40px;
    max-width: 900px;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
}

.public-header {
    text-align: center;
    margin-bottom: 40px;
}

.public-header img {
    width: 100px;
    height: 100px;
    object-fit: contain;
    margin-bottom: 20px;
}

.public-header h1 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 10px;
}

.public-header p {
    color: #666;
    font-size: 1.1rem;
}

.ogrenci-item {
    background: var(--light-bg);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    position: relative;
}

.ogrenci-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.ogrenci-item-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
}

.btn-remove-ogrenci {
    background: var(--danger-color);
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.85rem;
}

/* Loading Spinner */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #666;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-menu {
        flex-direction: column;
        width: 100%;
    }
    
    .nav-menu li a {
        width: 100%;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .search-filter-bar {
        flex-direction: column;
    }
    
    .search-box {
        width: 100%;
    }
    
    .modal-content {
        max-width: 95%;
    }
    
    .data-table {
        font-size: 0.85rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 8px;
    }
    
    .card {
        padding: 15px;
    }
}

/* Print Styles */
@media print {
    .main-header,
    .main-nav,
    .btn,
    .search-filter-bar,
    .pagination {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }
.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }
.p-1 { padding: 10px; }
.p-2 { padding: 20px; }
.p-3 { padding: 30px; }
.d-flex { display: flex; }
.gap-1 { gap: 10px; }
.gap-2 { gap: 20px; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }
.text-warning { color: var(--warning-color); }
.text-info { color: var(--info-color); }
.text-muted { color: #999; }
.fw-bold { font-weight: 700; }
.fw-normal { font-weight: 400; }