/* Custom CSS untuk E-Learning System */

:root {
    --primary-color: #4a6fa5;
    --primary-light: #6b8db8;
    --primary-dark: #3a5a8a;
    --secondary-color: #f8f9fa;
    --accent-color: #e3f2fd;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

/* Header Styles */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    box-shadow: var(--shadow);
}

.navbar-brand {
    font-weight: 600;
    color: white !important;
}

.navbar-nav .nav-link {
    color: rgba(255,255,255,0.9) !important;
    transition: color 0.3s ease;
}

.navbar-nav .nav-link:hover {
    color: white !important;
}

/* Card Styles */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-radius: 12px 12px 0 0 !important;
    border: none;
    font-weight: 600;
}

/* Button Styles */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(74, 111, 165, 0.3);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #34ce57);
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    font-weight: 500;
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning-color), #ffca2c);
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    font-weight: 500;
    color: #212529;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color), #e74c3c);
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    font-weight: 500;
}

/* Form Styles */
.form-control {
    border-radius: 8px;
    border: 2px solid var(--border-color);
    padding: 12px 15px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(74, 111, 165, 0.25);
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

/* Table Styles */
.table {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.table thead th {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border: none;
    font-weight: 600;
    padding: 15px;
}

.table tbody tr {
    transition: background-color 0.2s ease;
}

.table tbody tr:hover {
    background-color: var(--accent-color);
}

/* Dashboard Stats */
.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

.stat-card.success {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

.stat-card.warning {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.stat-card.info {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Sidebar Styles */
.sidebar {
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 20px;
}

.sidebar .nav-link {
    color: var(--text-primary);
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 5px;
    transition: all 0.3s ease;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
}

.sidebar .nav-link i {
    margin-right: 10px;
    width: 20px;
}

/* Alert Styles */
.alert {
    border-radius: 8px;
    border: none;
    padding: 15px 20px;
}

.alert-success {
    background: linear-gradient(135deg, #d4edda, #c3e6cb);
    color: #155724;
}

.alert-danger {
    background: linear-gradient(135deg, #f8d7da, #f5c6cb);
    color: #721c24;
}

.alert-warning {
    background: linear-gradient(135deg, #fff3cd, #ffeaa7);
    color: #856404;
}

.alert-info {
    background: linear-gradient(135deg, #d1ecf1, #bee5eb);
    color: #0c5460;
}

/* Badge Styles */
.badge {
    border-radius: 6px;
    padding: 6px 12px;
    font-weight: 500;
}

.badge-success {
    background: linear-gradient(135deg, var(--success-color), #34ce57);
}

.badge-warning {
    background: linear-gradient(135deg, var(--warning-color), #ffca2c);
    color: #212529;
}

.badge-danger {
    background: linear-gradient(135deg, var(--danger-color), #e74c3c);
}

.badge-info {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
}

/* Modal Styles */
.modal-content {
    border-radius: 12px;
    border: none;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-radius: 12px 12px 0 0;
    border: none;
}

.modal-title {
    font-weight: 600;
}

/* File Upload Styles */
.file-upload {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    transition: border-color 0.3s ease;
}

.file-upload:hover {
    border-color: var(--primary-color);
}

.file-upload.dragover {
    border-color: var(--primary-color);
    background-color: var(--accent-color);
}

/* Progress Bar */
.progress {
    border-radius: 8px;
    height: 8px;
}

.progress-bar {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
}

/* Loading Spinner */
.spinner-border {
    color: var(--primary-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .card {
        margin-bottom: 20px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .sidebar {
        margin-bottom: 20px;
    }
    
    /* Auto-hide sidebar on mobile */
    body:not(.force-show-sidebar) .sidebar {
        display: none !important;
    }
    
    /* Force main content to full width on mobile when sidebar hidden */
    body:not(.force-show-sidebar) main.col-md-9,
    body:not(.force-show-sidebar) .col-md-9,
    body:not(.force-show-sidebar) .col-lg-10,
    body:not(.force-show-sidebar) .ms-sm-auto.col-lg-10,
    body:not(.force-show-sidebar) .col-md-9.ms-sm-auto.col-lg-10 {
        flex: 0 0 100% !important;
        max-width: 100% !important;
    }
    
    /* Show toggle button on mobile */
    .btn-toggle-sidebar {
        display: inline-block !important;
    }
}

/* Desktop styles - show sidebar by default */
@media (min-width: 769px) {
    /* Auto-show sidebar on desktop */
    body:not(.hide-sidebar) .sidebar {
        display: block !important;
    }
    
    /* Hide toggle button on desktop unless sidebar is manually hidden */
    .btn-toggle-sidebar {
        display: none;
    }
    
    /* Show toggle button when sidebar is manually hidden */
    body.hide-sidebar .btn-toggle-sidebar {
        display: inline-block !important;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

/* Sidebar Toggle */
.btn-toggle-sidebar {
    white-space: nowrap;
}

/* Hide sidebar and expand content */
body.hide-sidebar .sidebar {
    display: none !important;
}

/* Force main content to full width when sidebar hidden */
body.hide-sidebar main.col-md-9,
body.hide-sidebar .col-md-9,
body.hide-sidebar .col-lg-10,
body.hide-sidebar .ms-sm-auto.col-lg-10,
body.hide-sidebar .col-md-9.ms-sm-auto.col-lg-10 {
    flex: 0 0 100% !important;
    max-width: 100% !important;
}

/* Force show sidebar class for mobile */
body.force-show-sidebar .sidebar {
    display: block !important;
}

body.force-show-sidebar main.col-md-9,
body.force-show-sidebar .col-md-9,
body.force-show-sidebar .col-lg-10,
body.force-show-sidebar .ms-sm-auto.col-lg-10,
body.force-show-sidebar .col-md-9.ms-sm-auto.col-lg-10 {
    flex: 0 0 66.666667% !important;
    max-width: 66.666667% !important;
}

/* Print Styles */
@media print {
    .navbar, .sidebar, .btn {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}