/**
 * OneExam UI/UX Improvements
 * Améliorations globales de l'interface utilisateur
 */

/* ========== VARIABLES UI/UX ========== */
:root {
    /* Spacing system - 8px grid */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(20, 33, 61, 0.05);
    --shadow-md: 0 4px 6px rgba(20, 33, 61, 0.07);
    --shadow-lg: 0 10px 15px rgba(20, 33, 61, 0.1);
    --shadow-xl: 0 20px 25px rgba(20, 33, 61, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Colors */
    --color-primary: #14213D;
    --color-accent: #FCA311;
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-danger: #dc3545;
    --color-info: #17a2b8;
    --color-text: #333;
    --color-text-muted: #6c757d;
    --color-border: #e5e5e5;
    --color-bg: #f8f9fa;
}

/* ========== TYPOGRAPHY ========== */
body {
    font-family: 'Public Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

/* ========== CARDS - Improved ========== */
.card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
    overflow: hidden;
}

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

.card-header {
    background-color: #fff;
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-lg);
    font-weight: 600;
}

.card-body {
    padding: var(--space-lg);
}

.card-footer {
    background-color: #fff;
    border-top: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-lg);
}

/* Stat cards */
.stat-card {
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.stat-card .stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.stat-card .stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* ========== BUTTONS - Enhanced ========== */
.btn {
    font-weight: 500;
    border-radius: var(--radius-md);
    padding: 0.5rem 1rem;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.btn:focus {
    box-shadow: 0 0 0 3px rgba(252, 163, 17, 0.3);
}

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

.btn-primary:hover {
    background-color: #0F1A2E;
    border-color: #0F1A2E;
    transform: translateY(-1px);
}

.btn-warning {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: #000;
}

.btn-warning:hover {
    background-color: #E8940F;
    border-color: #E8940F;
    color: #000;
    transform: translateY(-1px);
}

.btn-outline-primary {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline-primary:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-1px);
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

/* Button groups */
.btn-group-actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* ========== FORMS - Improved ========== */
.form-control,
.form-select {
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    padding: 0.625rem 0.875rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(252, 163, 17, 0.15);
}

.form-label {
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.form-text {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-top: var(--space-xs);
}

/* Form groups */
.mb-3 {
    margin-bottom: var(--space-lg) !important;
}

/* Input groups */
.input-group {
    border-radius: var(--radius-md);
}

.input-group-text {
    background-color: var(--color-bg);
    border-color: var(--color-border);
}

/* ========== TABLES - Enhanced ========== */
.table {
    border-collapse: separate;
    border-spacing: 0;
}

.table thead th {
    background-color: var(--color-bg);
    font-weight: 600;
    color: var(--color-primary);
    padding: var(--space-md);
    border-bottom: 2px solid var(--color-border);
    white-space: nowrap;
}

.table tbody td {
    padding: var(--space-md);
    vertical-align: middle;
    border-bottom: 1px solid var(--color-border);
}

.table tbody tr {
    transition: background-color var(--transition-fast);
}

.table tbody tr:hover {
    background-color: rgba(252, 163, 17, 0.05);
}

.table-responsive {
    border-radius: var(--radius-lg);
    overflow: hidden;
}

/* ========== BADGES - Enhanced ========== */
.badge {
    font-weight: 500;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    letter-spacing: 0.02em;
}

.badge.bg-success,
.badge.bg-label-success {
    background-color: rgba(40, 167, 69, 0.15) !important;
    color: #28a745 !important;
}

.badge.bg-warning,
.badge.bg-label-warning {
    background-color: rgba(252, 163, 17, 0.15) !important;
    color: #E8940F !important;
}

.badge.bg-danger,
.badge.bg-label-danger {
    background-color: rgba(220, 53, 69, 0.15) !important;
    color: #dc3545 !important;
}

.badge.bg-info,
.badge.bg-label-info {
    background-color: rgba(23, 162, 184, 0.15) !important;
    color: #17a2b8 !important;
}

.badge.bg-primary,
.badge.bg-label-primary {
    background-color: rgba(20, 33, 61, 0.15) !important;
    color: #14213D !important;
}

.badge.bg-secondary,
.badge.bg-label-secondary {
    background-color: rgba(108, 117, 125, 0.15) !important;
    color: #6c757d !important;
}

/* ========== ALERTS - Improved ========== */
.alert {
    border-radius: var(--radius-md);
    border: none;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
}

.alert-success {
    background-color: rgba(40, 167, 69, 0.1);
    color: #155724;
}

.alert-warning {
    background-color: rgba(252, 163, 17, 0.1);
    color: #856404;
}

.alert-danger {
    background-color: rgba(220, 53, 69, 0.1);
    color: #721c24;
}

.alert-info {
    background-color: rgba(23, 162, 184, 0.1);
    color: #0c5460;
}

/* ========== PAGINATION - Enhanced ========== */
.pagination {
    gap: var(--space-xs);
}

.page-link {
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    padding: 0.5rem 0.875rem;
    color: var(--color-primary);
    transition: all var(--transition-fast);
}

.page-link:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.page-item.active .page-link {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: #000;
}

/* ========== DROPDOWN - Enhanced ========== */
.dropdown-menu {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-sm);
}

.dropdown-item {
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    transition: background-color var(--transition-fast);
}

.dropdown-item:hover {
    background-color: rgba(252, 163, 17, 0.1);
}

.dropdown-item.active,
.dropdown-item:active {
    background-color: var(--color-primary);
    color: #fff;
}

/* ========== MODAL - Enhanced ========== */
.modal-content {
    border: none;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.modal-header {
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-lg);
}

.modal-body {
    padding: var(--space-lg);
}

.modal-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-lg);
}

/* ========== SIDEBAR/MENU - Enhanced ========== */
.layout-menu {
    box-shadow: var(--shadow-lg);
}

.menu-item {
    margin: var(--space-xs) 0;
}

.menu-link {
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    transition: all var(--transition-fast);
}

.menu-item.active > .menu-link {
    background-color: var(--color-accent) !important;
    color: #000 !important;
    font-weight: 600;
}

/* ========== EMPTY STATES ========== */
.empty-state {
    text-align: center;
    padding: var(--space-3xl) var(--space-lg);
}

.empty-state-icon {
    font-size: 4rem;
    color: var(--color-border);
    margin-bottom: var(--space-lg);
}

.empty-state-title {
    font-size: 1.25rem;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.empty-state-desc {
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
}

/* ========== LOADING STATES ========== */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ========== BREADCRUMBS ========== */
.breadcrumb {
    background: none;
    padding: 0;
    margin-bottom: var(--space-lg);
}

.breadcrumb-item a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
    color: var(--color-accent);
}

.breadcrumb-item.active {
    color: var(--color-primary);
    font-weight: 500;
}

/* ========== TOOLTIPS ========== */
.tooltip-inner {
    background-color: var(--color-primary);
    border-radius: var(--radius-sm);
    padding: var(--space-sm) var(--space-md);
}

/* ========== ACCESSIBILITY ========== */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: #fff;
    padding: var(--space-sm) var(--space-md);
    z-index: 9999;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* ========== RESPONSIVE IMPROVEMENTS ========== */
@media (max-width: 768px) {
    .card-body {
        padding: var(--space-md);
    }

    .table thead th,
    .table tbody td {
        padding: var(--space-sm);
    }

    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }

    .btn-group-actions {
        flex-direction: column;
    }

    .btn-group-actions .btn {
        width: 100%;
    }
}

/* ========== PRINT STYLES ========== */
@media print {
    .no-print {
        display: none !important;
    }

    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }

    a[href]:after {
        content: " (" attr(href) ")";
    }
}

/* ========== ANIMATIONS ========== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease forwards;
}

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

.slide-in-right {
    animation: slideInRight 0.3s ease forwards;
}

/* ========== UTILITY CLASSES ========== */
.text-primary { color: var(--color-primary) !important; }
.text-accent { color: var(--color-accent) !important; }
.text-muted { color: var(--color-text-muted) !important; }

.bg-primary { background-color: var(--color-primary) !important; }
.bg-accent { background-color: var(--color-accent) !important; }
.bg-light { background-color: var(--color-bg) !important; }

.border-accent { border-color: var(--color-accent) !important; }

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

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