:root {
    --sidebar-width: 250px;
    --sidebar-bg: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
    --sidebar-hover: rgba(255,255,255,0.08);
    --sidebar-active: #0ea5e9;
    --primary: #0ea5e9;
    --primary-dark: #0284c7;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;
    --dark: #1e293b;
    --gray: #64748b;
    --bg: #f1f5f9;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --card-hover-shadow: 0 10px 30px rgba(0,0,0,0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    background: var(--bg);
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    overflow-x: hidden;
    color: var(--dark);
}

#wrapper {
    min-height: 100vh;
}

/* === SIDEBAR MODERNA === */
.sidebar {
    width: var(--sidebar-width);
    min-height: 100vh;
    background: var(--sidebar-bg);
    color: #fff;
    transition: margin-left 0.3s;
}

.sidebar .sidebar-header {
    border-bottom: 1px solid rgba(255,255,255,0.06);
    padding: 1.2rem 1.25rem !important;
}

.sidebar .sidebar-header h6 {
    font-weight: 600;
    letter-spacing: 0.3px;
    font-size: 0.9rem;
    opacity: 0.9;
}

.sidebar .nav-link {
    color: rgba(255,255,255,0.65);
    padding: 11px 22px;
    font-size: 0.85rem;
    border-left: 3px solid transparent;
    transition: var(--transition);
    font-weight: 450;
    letter-spacing: 0.2px;
}

.sidebar .nav-link:hover {
    background: var(--sidebar-hover);
    color: #fff;
    border-left-color: var(--sidebar-active);
    transform: translateX(2px);
}

.sidebar .nav-link.active {
    background: var(--sidebar-hover);
    color: #fff;
    border-left-color: var(--sidebar-active);
    font-weight: 600;
}

.sidebar .nav-link i {
    width: 22px;
    text-align: center;
    font-size: 1.05rem;
}

#content {
    width: calc(100% - var(--sidebar-width));
}

@media (max-width: 767.98px) {
    .sidebar {
        margin-left: calc(-1 * var(--sidebar-width));
        position: fixed;
        z-index: 1000;
    }
    .sidebar.show {
        margin-left: 0;
    }
    #content {
        width: 100%;
    }
}

/* === CARDS MODERNAS === */
.card {
    border-radius: var(--radius);
    border: none;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

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

.card-header {
    background: #fff;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 1rem 1.25rem;
    border-radius: var(--radius) var(--radius) 0 0 !important;
}

/* Tarjetas de estadísticas */
.stat-card {
    border-radius: var(--radius);
    border: none;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
    cursor: default;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.12);
}

.stat-card .stat-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.stat-card .stat-label {
    font-size: 0.8rem;
    font-weight: 500;
    opacity: 0.85;
    letter-spacing: 0.3px;
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.stat-card .stat-value {
    font-size: 1.6rem;
    font-weight: 700;
    line-height: 1.2;
}

.stat-card .stat-footer {
    font-size: 0.75rem;
    opacity: 0.7;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid rgba(255,255,255,0.15);
}

/* Gradientes para stat-cards */
.bg-gradient-primary {
    background: linear-gradient(135deg, #0ea5e9, #3b82f6);
    color: #fff;
}
.bg-gradient-success {
    background: linear-gradient(135deg, #10b981, #059669);
    color: #fff;
}
.bg-gradient-warning {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #fff;
}
.bg-gradient-danger {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: #fff;
}
.bg-gradient-info {
    background: linear-gradient(135deg, #06b6d4, #0891b2);
    color: #fff;
}
.bg-gradient-secondary {
    background: linear-gradient(135deg, #64748b, #475569);
    color: #fff;
}
.bg-gradient-dark {
    background: linear-gradient(135deg, #334155, #1e293b);
    color: #fff;
}

/* Gráficos */
.chart-container {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--card-shadow);
    padding: 1.25rem;
    transition: var(--transition);
}

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

.chart-container .chart-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chart-container .chart-title i {
    font-size: 1.1rem;
}

/* === BADGES === */
.badge {
    font-weight: 500;
    padding: 0.35em 0.65em;
    border-radius: 6px;
}

/* === TABLAS === */
.table th {
    font-weight: 600;
    color: var(--gray);
    border-top: none;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.85rem 0.75rem;
}

.table td {
    vertical-align: middle;
    padding: 0.75rem;
    font-size: 0.875rem;
}

.table-hover tbody tr:hover {
    background-color: rgba(14, 165, 233, 0.03);
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.search-box {
    max-width: 300px;
}

/* === STOCK === */
.stock-verde { color: var(--success); font-weight: 600; }
.stock-amarillo { color: var(--warning); font-weight: 600; }
.stock-rojo { color: var(--danger); font-weight: 600; }

/* === POS === */
.pos-container {
    height: calc(100vh - 120px);
}

.pos-productos {
    overflow-y: auto;
    height: 100%;
}

.pos-carrito {
    overflow-y: auto;
    max-height: 350px;
}

.producto-card {
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
}

.producto-card:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(14, 165, 233, 0.15);
}

.producto-card .card-title {
    font-size: 0.8rem;
    font-weight: 600;
}

.producto-card .precio {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary);
}

#total-display {
    font-size: 2rem;
    font-weight: 700;
}

#vuelto-display {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--success);
}

.factura-info {
    font-size: 12px;
}

/* === ALERTAS === */
.alert {
    border: none;
    border-radius: var(--radius-sm);
}

/* === BOTONES === */
.btn {
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    transition: var(--transition);
}

.btn:hover {
    transform: translateY(-1px);
}

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

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

/* === NAVBAR === */
.navbar {
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

/* === FORM CONTROLS === */
.form-control, .form-select {
    border-radius: var(--radius-sm);
    border: 1.5px solid #e2e8f0;
    font-size: 0.875rem;
    padding: 0.5rem 0.75rem;
    transition: var(--transition);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

/* TÍTULOS DE PÁGINA */
.page-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.page-title i {
    font-size: 1.4rem;
    color: var(--primary);
}