:root {
    --sidebar-width: 250px;
    --sidebar-collapsed-width: 170px;
    --transition-speed: 0.3s;
    --footer-bg: linear-gradient(135deg, #2c3e50, #34495e);
    --navbar-height: 56px;
}

/* Dashboard Layout */
.dashboard-container {
    display: flex;
    min-height: 100vh;
    position: relative;
}

/* Navbar Mobile */
.navbar-custom {
    background: var(--footer-bg);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1030;
}

/* Mobile Menu */
.offcanvas {
    background: var(--footer-bg);
    color: white;
}

.offcanvas-header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.offcanvas .btn-close {
    filter: invert(1) grayscale(100%) brightness(200%);
}

.mobile-nav .nav-link {
    color: rgba(255, 255, 255, 0.8) !important;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    text-decoration: none;
    border-radius: 8px;
    margin: 0.25rem 0;
    transition: all var(--transition-speed);
}

.mobile-nav .nav-link:hover {
    color: white !important;
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(5px);
}

.mobile-nav .nav-link i {
    margin-right: 1rem;
    width: 24px;
    font-size: 1.2rem;
}

/* Sidebar Enhancements */
.dashboard-sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(135deg, #1e2a3a, #2c3e50); /* Gradient plus prononcé */
    position: fixed;
    height: 100vh;
    top: 0;
    left: 0;
    z-index: 1000;
    transition: all var(--transition-speed) ease;
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.3) transparent;
    box-shadow: 4px 0 15px rgba(0, 0, 0, 0.1);
}

.dashboard-sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

/* Enhanced Header */
.sidebar-header {
    padding: 1.25rem 1rem;
    color: white;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    background: rgba(0, 0, 0, 0.2);
    z-index: 2;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(5px);
}

.sidebar-header .nav-link {
    padding: 0;
    margin: 0;
    background: transparent !important;
}

.sidebar-header .nav-link:hover {
    transform: none !important;
}

.sidebar-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.sidebar-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05) rotate(90deg);
}

/* Enhanced Navigation */
.sidebar-nav {
    padding: 0.5rem 0;
}



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

.nav-link {
    color: rgba(255, 255, 255, 0.8) !important;
    display: flex;
    align-items: center;
    text-decoration: none;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    transition: all var(--transition-speed);
}

.nav-link:hover {
    color: white !important;
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(5px);
}

.nav-link i {
    width: 24px;
    margin-right: 1rem;
    font-size: 1.2rem;
}

.nav-link span {
    opacity: 1;
    transition: opacity var(--transition-speed);
    white-space: nowrap;
}

.collapsed .nav-link span {
    opacity: 0;
    width: 0;
    display: none;
}

/* Main Content */
.dashboard-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    transition: margin var(--transition-speed) ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.dashboard-content.expanded {
    margin-left: var(--sidebar-collapsed-width);
}

/* Footer */
.footer {
    background: var(--footer-bg);
    color: white;
    padding: 4rem 0 2rem;
    margin-top: auto;
}

/* Responsive Design */
@media (max-width: 767.98px) {
    .dashboard-content {
        margin-left: 0;
        padding-top: var(--navbar-height);
    }
    
    .dashboard-content.expanded {
        margin-left: 0;
    }
}

/* Cards & Stats */
.stat-card {
    background: white;
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

/* Chart Containers */
.chart-container {
    background: white;
    border-radius: 15px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.chart-container h4 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-weight: 600;
}