/* Mejoras para DataTables paginación y tabla */
.dataTables_wrapper .dataTables_paginate .paginate_button {
    border-radius: 0.375rem;
    margin: 0 2px;
    border: none;
    background: #f3f4f6;
    color: #374151;
    transition: background 0.2s, color 0.2s;
}
.dataTables_wrapper .dataTables_paginate .paginate_button.current {
    background: #2563eb;
    color: #fff !important;
    font-weight: 600;
}
.dataTables_wrapper .dataTables_paginate .paginate_button:hover {
    background: #dbeafe;
    color: #1d4ed8;
}
.dataTables_wrapper .dataTables_length select {
    border-radius: 0.375rem;
    border: 1px solid #d1d5db;
    padding: 0.25rem 0.5rem;
}
.dataTables_wrapper .dataTables_filter input {
    border-radius: 0.375rem;
    border: 1px solid #d1d5db;
    padding: 0.25rem 0.5rem;
}
/* CDEM - Sistema de Asistencia - Estilos Principales */

:root {
    --primary-color: #1e40af;
    --primary-dark: #1e3a8a;
    --primary-light: #3b82f6;
    --secondary-color: #0ea5e9;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --info-color: #6366f1;
    
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --border-radius: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    min-height: 100vh;
}

/* Layout Principal */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
    box-shadow: var(--shadow-xl);
}

.sidebar.collapsed {
    width: 80px;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.sidebar-logo {
    width: 40px;
    height: 40px;
    background: white;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: var(--primary-color);
    font-size: 1.2rem;
}

.sidebar-title {
    font-size: 1.25rem;
    font-weight: 600;
    transition: var(--transition);
}

.sidebar.collapsed .sidebar-title {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

.sidebar-nav {
    padding: 1rem 0;
}

.nav-item {
    margin: 0.25rem 1rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: var(--transition);
}

.nav-link:hover::before {
    left: 100%;
}

.nav-link:hover,
.nav-link.active {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transform: translateX(4px);
}

.nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-text {
    transition: var(--transition);
}

.sidebar.collapsed .nav-text {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.main-content.sidebar-collapsed {
    margin-left: 80px;
}

/* Header */
.header {
    background: white;
    padding: 1rem 2rem;
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.sidebar-toggle {
    background: none;
    border: none;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition);
}

.sidebar-toggle:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.header-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-800);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-menu {
    position: relative;
}

.user-button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--gray-100);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.user-button:hover {
    background: var(--gray-200);
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 1000;
}

.user-menu:hover .user-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--gray-700);
    text-decoration: none;
    transition: var(--transition);
    border-bottom: 1px solid var(--gray-100);
}

.dropdown-item:last-child {
    border-bottom: none;
}

.dropdown-item:hover {
    background: var(--gray-50);
    color: var(--gray-900);
}

/* Content Area */
.content {
    flex: 1;
    padding: 2rem;
}

/* Page Header */
.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.page-header-content {
    flex: 1 1 320px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.page-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
}

.page-title i {
    width: 28px;
    height: 28px;
}

.page-subtitle {
    margin: 0;
    color: var(--gray-500);
    font-size: 0.95rem;
    max-width: 720px;
}

.page-header-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
}

.page-header-actions .btn {
    white-space: nowrap;
}

/* Cards */
.card {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    background: var(--gray-50);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 0;
}

.card-body {
    padding: 1.5rem;
}

.card-section {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.card + .card {
    margin-top: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--gray-200);
    background: var(--gray-50);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stats-grid.compact {
    gap: 1rem;
}

.stat-card {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-card.compact {
    padding: 1.25rem;
}

.stat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.stat-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

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

.stat-icon.success {
    background: linear-gradient(135deg, var(--success-color), #34d399);
}

.stat-icon.warning {
    background: linear-gradient(135deg, var(--warning-color), #fbbf24);
}

.stat-icon.info {
    background: linear-gradient(135deg, var(--info-color), #8b5cf6);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.stat-change {
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.stat-change.positive {
    color: var(--success-color);
}

.stat-change.negative {
    color: var(--error-color);
}

.stat-meta {
    font-size: 0.8125rem;
    color: var(--gray-500);
}

.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    background: var(--gray-100);
    color: var(--gray-700);
}

.status-indicator::before {
    content: '';
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    background: currentColor;
    opacity: 0.75;
}

.status-indicator.success {
    background: #ecfdf5;
    color: #047857;
}

.status-indicator.warning {
    background: #fef3c7;
    color: #b45309;
}

.status-indicator.danger {
    background: #fee2e2;
    color: #b91c1c;
}

.status-indicator.info {
    background: #eff6ff;
    color: #1d4ed8;
}

.section-title {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--gray-800);
}

.section-subtitle {
    margin: 0;
    font-size: 0.875rem;
    color: var(--gray-500);
}

.form-hint {
    margin-top: 0.25rem;
    font-size: 0.75rem;
    color: var(--gray-500);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
    line-height: 1;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-200);
    color: var(--gray-800);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #34d399);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: linear-gradient(135deg, #059669, var(--success-color));
    transform: translateY(-1px);
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning-color), #fbbf24);
    color: white;
}

.btn-warning:hover:not(:disabled) {
    background: linear-gradient(135deg, #d97706, var(--warning-color));
    transform: translateY(-1px);
}

.btn-danger {
    background: linear-gradient(135deg, var(--error-color), #f87171);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background: linear-gradient(135deg, #dc2626, var(--error-color));
    transform: translateY(-1px);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-outline {
    background: white;
    border: 1px solid var(--gray-300);
    color: var(--gray-600);
}

.btn-outline:hover:not(:disabled) {
    background: var(--gray-100);
    color: var(--gray-800);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--gray-700);
}

.form-control,
.form-select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    transition: var(--transition);
    background: white;
}

.form-control:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-control[readonly] {
    background: var(--gray-100);
    cursor: not-allowed;
    color: var(--gray-700);
}

.form-control.is-invalid {
    border-color: var(--error-color);
}

.form-control.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.invalid-feedback {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.75rem;
    color: var(--error-color);
}

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

/* Tables */
.table-container {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    overflow: hidden;
}

.table-wrapper {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    overflow: hidden;
}

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

.table th,
.table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table tbody tr:hover {
    background: var(--gray-50);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

/* Tabs */
.tabs-card .card-header {
    background: transparent;
    border-bottom: 1px solid var(--gray-200);
    padding-bottom: 1rem;
}

.tab-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tab-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
    background: var(--gray-100);
    color: var(--gray-600);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.tab-button i {
    width: 18px;
    height: 18px;
}

.tab-button:hover {
    background: var(--gray-200);
    color: var(--gray-800);
}

.tab-button.is-active {
    border-color: transparent;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    box-shadow: var(--shadow-sm);
}

.tab-panel {
    display: none;
}

.tab-panel.is-active {
    display: block;
    animation: fadeIn 0.2s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Layout helpers */
.grid-two-column {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    align-items: flex-start;
}

.stacked-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.info-block {
    padding: 1rem;
    border-radius: var(--border-radius);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.info-block strong {
    color: var(--gray-700);
}

.illustration-preview {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.preview-frame {
    position: relative;
    width: 100%;
    max-width: 260px;
    aspect-ratio: 3 / 4;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--gray-200);
    background: linear-gradient(180deg, #111827, #1f2937);
    overflow: hidden;
    margin: 0 auto;
    cursor: pointer;
    transition: transform 0.2s ease;
    padding: 0;
}

.preview-frame:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.preview-frame:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.preview-frame img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #0f172a;
    display: block;
}

.preview-frame-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(15, 23, 42, 0) 40%, rgba(15, 23, 42, 0.55) 100%);
    color: white;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.75rem;
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
    gap: 0.35rem;
}

.preview-frame:hover .preview-frame-overlay {
    opacity: 1;
}

.preview-frame-overlay i {
    width: 18px;
    height: 18px;
}

.preview-actions {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 0.25rem;
}

.preview-actions .btn {
    font-size: 0.75rem;
    padding: 0.4rem 0.9rem;
}

.template-summary {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
    border-radius: var(--border-radius-lg);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
}

.template-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--gray-600);
}

.template-meta strong {
    color: var(--gray-700);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

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

.badge.bg-warning {
    background: var(--warning-color);
    color: white;
}

.badge.bg-danger {
    background: var(--error-color);
    color: white;
}

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

/* Alerts */
.alert {
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    border: 1px solid transparent;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.alert-success {
    background: #f0fdf4;
    border-color: #bbf7d0;
    color: #166534;
}

.alert-error {
    background: #fef2f2;
    border-color: #fecaca;
    color: #991b1b;
}

.alert-warning {
    background: #fffbeb;
    border-color: #fed7aa;
    color: #92400e;
}

.alert-info {
    background: #eff6ff;
    border-color: #bfdbfe;
    color: #1e40af;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(0.4,0,0.2,1), visibility 0.3s cubic-bezier(0.4,0,0.2,1);
}

.modal.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.modal-content {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-400);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--gray-600);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.modal-full-image .modal-body {
    padding: 0;
    background: #000;
}

.modal-full-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* Loading */
.loading {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray-600);
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--gray-300);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .header {
        padding: 1rem;
    }
    
    .content {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-color); }
.text-success { color: var(--success-color); }
.text-warning { color: var(--warning-color); }
.text-error { color: var(--error-color); }
.text-info { color: var(--info-color); }

.bg-primary { background-color: var(--primary-color); }
.bg-success { background-color: var(--success-color); }
.bg-warning { background-color: var(--warning-color); }
.bg-error { background-color: var(--error-color); }
.bg-info { background-color: var(--info-color); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 2rem; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 2rem; }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }
.align-items-center { align-items: center; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.rounded { border-radius: var(--border-radius); }
.rounded-lg { border-radius: var(--border-radius-lg); }
.rounded-xl { border-radius: var(--border-radius-xl); }

.shadow { box-shadow: var(--shadow); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }