/* =============================
   GSWeb UI – thème modernisé ultra-performant
   Compatible Bootstrap 3 + optimisations CSS3
   ============================= */

:root {
    /* Couleurs principales */
    --gs-bg: #f6f8fb;
    --gs-surface: #ffffff;
    --gs-text: #1f2937;
    --gs-muted: #6b7280;
    --gs-border: #e5e7eb;

    /* Palette de couleurs */
    --gs-primary: #2563eb;
    --gs-primary-hover: #1d4ed8;
    --gs-primary-light: #dbeafe;
    --gs-success: #16a34a;
    --gs-success-hover: #15803d;
    --gs-danger: #dc2626;
    --gs-danger-hover: #b91c1c;
    --gs-warning: #f59e0b;
    --gs-warning-hover: #d97706;
    --gs-info: #0ea5e9;
    --gs-info-hover: #0284c7;

    /* Espacement et rayons */
    --gs-radius: 12px;
    --gs-radius-sm: 8px;
    --gs-radius-lg: 16px;
    --gs-spacing: 16px;
    --gs-spacing-sm: 8px;
    --gs-spacing-lg: 24px;
    
    /* Ombres optimisées (GPU-accelerated) */
    --gs-shadow: 0 10px 25px rgba(17, 24, 39, 0.08);
    --gs-shadow-sm: 0 4px 12px rgba(17, 24, 39, 0.06);
    --gs-shadow-md: 0 6px 16px rgba(17, 24, 39, 0.08);
    --gs-shadow-lg: 0 12px 32px rgba(17, 24, 39, 0.12);
    
    /* Transitions rapides */
    --gs-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --gs-transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --gs-transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

/* Optimisations performances navigateur */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--gs-bg);
    color: var(--gs-text);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-size: 15px;
    line-height: 1.6;
    /* GPU acceleration pour smooth scrolling */
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    will-change: scroll-position;
}

/* Scroll fluide */
html {
    scroll-behavior: smooth;
}

/* Optimisation des sélections */
::selection {
    background: var(--gs-primary-light);
    color: var(--gs-text);
}

/* Focus visible amélioré */
:focus-visible {
    outline: 2px solid var(--gs-primary);
    outline-offset: 2px;
}

/* Layout */
.container {
    width: 100%;
    padding: 20px;
}

/* Titres / sections */
.home-sections {
    margin: 10px 0 16px;
    padding: 14px 16px;
    background: var(--gs-surface);
    border: 1px solid var(--gs-border);
    border-radius: var(--gs-radius);
    box-shadow: var(--gs-shadow-sm);
}

.home-sections h3 {
    margin: 6px 0;
    font-weight: 600;
    letter-spacing: .2px;
}

/* Page headers modernes */
.gs-page-header {
    background: var(--gs-surface);
    border: 1px solid var(--gs-border);
    border-radius: var(--gs-radius);
    padding: 28px 32px;
    margin-bottom: 28px;
    box-shadow: var(--gs-shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}

.gs-page-header__content {
    flex: 1;
}

.gs-page-header__title {
    font-size: 28px;
    font-weight: 800;
    margin: 0 0 8px;
    color: var(--gs-text);
}

.gs-page-header__description {
    color: var(--gs-muted);
    margin: 0;
    font-size: 17px;
}

.gs-page-header__actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

/* Cards utilitaires */
.gs-card {
    background: var(--gs-surface);
    border: 1px solid var(--gs-border);
    border-radius: var(--gs-radius);
    box-shadow: var(--gs-shadow-sm);
    padding: 24px;
    margin-bottom: 24px;
}

.gs-card-body {
    padding: 24px 28px;
}

.gs-card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--gs-border);
    background: linear-gradient(180deg, rgba(37, 99, 235, 0.05), transparent);
    font-weight: 700;
    font-size: 20px;
}

/* Filters / Controls bar */
.gs-filters {
    background: var(--gs-surface);
    border: 1px solid var(--gs-border);
    border-radius: var(--gs-radius);
    padding: 20px 24px;
    margin-bottom: 24px;
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
    box-shadow: var(--gs-shadow-sm);
}

.gs-filters label {
    font-weight: 600;
    color: var(--gs-text);
    margin: 0 8px 0 0;
    font-size: 16px;
}

.gs-filters select {
    min-width: 200px;
    height: 50px;
    font-size: 16px;
}

/* Forms */
.form-group {
    margin-bottom: 16px;
}

.input-group {
    width: 100%;
    margin-bottom: 12px;
}

.form-control {
    border-radius: var(--gs-radius-sm);
    padding: 10px 12px;
    font-size: 14px;
    color: var(--gs-text);
    border: 1px solid var(--gs-border);
    box-shadow: none;
    transition: border-color .15s ease, box-shadow .15s ease;
}

.form-control:focus {
    border-color: rgba(37, 99, 235, .45);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
    outline: none;
}

select.form-control {
    cursor: pointer;
}

/* Buttons - Design moderne et performant */
.btn {
    border-radius: var(--gs-radius-sm);
    padding: 10px 20px;
    font-weight: 600;
    transition: all var(--gs-transition-fast);
    border: 1px solid transparent;
    font-size: 14px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    /* GPU acceleration */
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    will-change: transform, box-shadow;
}

/* Effet de hover avec animation fluide */
.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width var(--gs-transition-base), height var(--gs-transition-base);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:active {
    transform: translateY(1px) scale(0.98);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Variantes de boutons */
.btn-success {
    background: linear-gradient(135deg, var(--gs-success) 0%, #15803d 100%);
    border-color: var(--gs-success);
    color: white;
    box-shadow: 0 4px 12px rgba(22, 163, 74, 0.25);
}

.btn-success:hover,
.btn-success:focus {
    background: linear-gradient(135deg, #15803d 0%, #166534 100%);
    box-shadow: 0 6px 20px rgba(22, 163, 74, 0.35);
    transform: translateY(-2px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--gs-primary) 0%, #1d4ed8 100%);
    border-color: var(--gs-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover,
.btn-primary:focus {
    background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
    transform: translateY(-2px);
}

.btn-danger {
    background: linear-gradient(135deg, var(--gs-danger) 0%, #b91c1c 100%);
    border-color: var(--gs-danger);
    color: white;
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.25);
}

.btn-danger:hover,
.btn-danger:focus {
    background: linear-gradient(135deg, #b91c1c 0%, #991b1b 100%);
    box-shadow: 0 6px 20px rgba(220, 38, 38, 0.35);
    transform: translateY(-2px);
}

.btn-warning {
    background: linear-gradient(135deg, var(--gs-warning) 0%, #d97706 100%);
    border-color: var(--gs-warning);
    color: white;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.25);
}

.btn-warning:hover,
.btn-warning:focus {
    background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.35);
    transform: translateY(-2px);
}

.btn-info {
    background: linear-gradient(135deg, var(--gs-info) 0%, #0284c7 100%);
    border-color: var(--gs-info);
    color: white;
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.25);
}

.btn-info:hover,
.btn-info:focus {
    background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
    box-shadow: 0 6px 20px rgba(14, 165, 233, 0.35);
    transform: translateY(-2px);
}

/* Boutons outline */
.btn-outline-primary {
    background: transparent;
    border: 2px solid var(--gs-primary);
    color: var(--gs-primary);
}

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

/* Tailles de boutons */
.btn-xs {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
    border-radius: var(--gs-radius);
}

/* Navbar (Bootstrap 3) - Design moderne */
.navbar {
    border-radius: var(--gs-radius);
    border: 1px solid var(--gs-border);
    background: var(--gs-surface) !important;
    box-shadow: var(--gs-shadow-sm);
    margin-bottom: 24px;
    min-height: 70px;
}

.navbar .navbar-nav > li > a {
    color: var(--gs-text) !important;
    font-weight: 600;
    font-size: 17px;
    padding: 20px 20px;
}

.navbar .navbar-nav > li > a:hover,
.navbar .navbar-nav > li > a:focus {
    color: var(--gs-primary) !important;
    background: rgba(37, 99, 235, .10) !important;
    border-radius: 10px;
}

.navbar .dropdown-menu {
    border-radius: 12px;
    border: 1px solid var(--gs-border);
    box-shadow: var(--gs-shadow);
    margin-top: 6px;
}

.navbar .dropdown-menu > li > a {
    padding: 12px 20px;
    font-size: 16px;
}

/* Tables */
.table {
    background: var(--gs-surface);
    border-radius: var(--gs-radius);
    overflow: hidden;
    font-size: 16px;
}

.table > thead > tr > th {
    border-bottom: 2px solid var(--gs-border);
    color: var(--gs-text);
    font-weight: 700;
    font-size: 15px;
    text-transform: uppercase;
    letter-spacing: .4px;
    padding: 18px 16px;
    background: linear-gradient(180deg, rgba(37, 99, 235, 0.06), transparent);
}

.table > tbody > tr > td {
    border-top: 1px solid var(--gs-border);
    padding: 16px;
    vertical-align: middle;
    font-size: 16px;
}

.table > tbody > tr:hover {
    background: rgba(37, 99, 235, .04);
}

.table-bordered {
    border: 1px solid var(--gs-border);
}

/* DataTables wrapper */
.dataTables_wrapper {
    background: var(--gs-surface);
    border: 1px solid var(--gs-border);
    border-radius: var(--gs-radius);
    padding: 24px;
    box-shadow: var(--gs-shadow-sm);
}

.dataTables_wrapper .dataTables_length,
.dataTables_wrapper .dataTables_filter {
    margin-bottom: 18px;
}

.dataTables_wrapper .dataTables_length label,
.dataTables_wrapper .dataTables_filter label {
    font-weight: 600;
    color: var(--gs-text);
    font-size: 16px;
}

.dataTables_wrapper .dataTables_info {
    color: var(--gs-muted);
    font-size: 15px;
}

/* Alerts */
.alert {
    border-radius: var(--gs-radius);
    padding: 14px 16px;
    border: 1px solid transparent;
}

.alert-danger {
    background: rgba(220, 38, 38, 0.1);
    border-color: rgba(220, 38, 38, 0.2);
    color: #991b1b;
}

.alert-success {
    background: rgba(22, 163, 74, 0.1);
    border-color: rgba(22, 163, 74, 0.2);
    color: #166534;
}

/* Footer */
.footer-text-container {
    padding: 12px 10px;
    background: var(--gs-surface);
    border-top: 1px solid var(--gs-border);
    color: var(--gs-muted);
    text-align: center;
    font-size: 13px;
}

/* Modals (Bootstrap 3) */
.modal-content {
    border-radius: var(--gs-radius);
    border: 1px solid var(--gs-border);
    box-shadow: 0 20px 40px rgba(17, 24, 39, 0.15);
}

.modal-header {
    background: linear-gradient(180deg, var(--gs-surface), rgba(37, 99, 235, 0.02));
    border-bottom: 1px solid var(--gs-border);
    padding: 18px 20px;
    border-radius: var(--gs-radius) var(--gs-radius) 0 0;
}

.modal-header .modal-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--gs-text);
    margin: 0;
}

.modal-header .close {
    margin-top: -4px;
    font-size: 28px;
    opacity: .6;
    color: var(--gs-text);
}

.modal-header .close:hover,
.modal-header .close:focus {
    opacity: 1;
    color: var(--gs-danger);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    background: rgba(246, 248, 251, 0.5);
    border-top: 1px solid var(--gs-border);
    padding: 14px 20px;
    border-radius: 0 0 var(--gs-radius) var(--gs-radius);
}

/* Forms (Bootstrap 3) */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    font-weight: 600;
    color: var(--gs-text);
    margin-bottom: 8px;
    font-size: 16px;
}

.form-control {
    height: 50px;
    border: 2px solid var(--gs-border);
    border-radius: var(--gs-radius-sm);
    padding: 12px 16px;
    font-size: 16px;
    transition: all .2s ease;
}

.form-control:focus {
    border-color: var(--gs-primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
    outline: none;
}

select.form-control {
    cursor: pointer;
}

textarea.form-control {
    height: auto;
    min-height: 120px;
    resize: vertical;
}

/* Responsive */
@media (max-width: 768px) {
    .gs-filters {
        flex-direction: column;
        align-items: stretch;
    }
    
    .gs-filters select {
        width: 100%;
    }
    
    .navbar .navbar-nav > li > a {
        font-size: 14px;
        padding: 12px 14px;
    }
}

/* Animations & Transitions */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Fade-in animation pour les cards */
.gs-card,
.gs-page-header {
    animation: fadeInUp 0.4s ease-out;
}

/* Animation respectant prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Loading states pour boutons */
.btn.is-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn.is-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 0.6s linear infinite;
}

/* Loading states pour tables */
.table.is-loading {
    position: relative;
    opacity: 0.6;
    pointer-events: none;
}

.table.is-loading::after {
    content: 'Chargement en cours...';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--gs-surface);
    padding: 12px 20px;
    border-radius: var(--gs-radius);
    box-shadow: var(--gs-shadow);
    font-weight: 600;
    color: var(--gs-primary);
    z-index: 10;
}

/* Focus states améliorés */
.btn:focus,
button:focus,
a:focus {
    outline: 2px solid var(--gs-primary);
    outline-offset: 2px;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
}

/* Hover effects subtils */
.gs-card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.gs-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(17, 24, 39, 0.12);
}

/* Transitions sur les boutons */
.btn {
    transition: all 0.2s ease;
}

.btn:active {
    transform: scale(0.97);
}