:root {
    --primary-color: #4e73df;
    --success-color: #1cc88a;
    --info-color: #36b9cc;
    --warning-color: #f6c23e;
    --danger-color: #e74a3b;
    --sidebar-width: 250px;
    --topbar-height: 60px;
    --sidebar-collapsed-width: 80px;
    --transition-speed: 0.3s;
}

body {
    font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f8f9fc;
    min-height: 100vh;
    padding-top: var(--topbar-height);
    padding-left: var(--sidebar-width);
    transition: padding-left var(--transition-speed);
}

/* Sidebar */
#sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    background: linear-gradient(180deg, #4e73df 10%, #224abe 100%);
    color: white;
    box-shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
    z-index: 1000;
    transition: width var(--transition-speed);
    overflow-x: hidden;
}

.sidebar-brand {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 800;
    padding: 1.5rem;
    text-decoration: none;
    color: white;
    transition: all var(--transition-speed);
    white-space: nowrap;
}

.sidebar-brand img {
    height: 2.5rem;
    margin-right: 0.5rem;
    transition: margin var(--transition-speed);
}

.sidebar-divider {
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    margin: 0 1rem 1rem;
    transition: margin var(--transition-speed);
}

.sidebar-heading {
    padding: 0 1rem;
    font-weight: 800;
    font-size: 0.65rem;
    color: rgba(255, 255, 255, 0.4);
    text-transform: uppercase;
    margin-top: 1rem;
    transition: all var(--transition-speed);
    white-space: nowrap;
}

.nav-item .nav-link {
    color: rgba(255, 255, 255, 0.8);
    padding: 0.75rem 1rem;
    font-weight: 600;
    font-size: 0.85rem;
    white-space: nowrap;
    position: relative;
    transition: all var(--transition-speed);
}

.nav-item .nav-link i {
    margin-right: 0.5rem;
    font-size: 0.85rem;
    width: 1.5rem;
    text-align: center;
    transition: margin var(--transition-speed);
}

.nav-item .nav-link:hover {
    color: white;
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-item .nav-link.active {
    color: white;
    background-color: rgba(255, 255, 255, 0.2);
}

.nav-item .nav-link.active::after {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: white;
}

/* Topbar */
#topbar {
    height: var(--topbar-height);
    position: fixed;
    top: 0;
    left: var(--sidebar-width);
    right: 0;
    background-color: white;
    box-shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
    z-index: 999;
    transition: left var(--transition-speed);
}

.topbar-divider {
    width: 0;
    border-right: 1px solid #e3e6f0;
    height: calc(var(--topbar-height) - 2rem);
    margin: auto 1rem;
}

.dropdown-menu {
    border: none;
    box-shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
}

.page-title {
    font-size: 1.2rem;
    font-weight: 600;
}

/* Main Content */
#content-wrapper {
    padding: 20px;
    width: 100%;
    transition: margin-left var(--transition-speed);
}

.dashboard-card {
    border-radius: 0.35rem;
    box-shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.1);
    border: none;
}

.card-primary {
    border-left: 0.25rem solid var(--primary-color);
}

.card-success {
    border-left: 0.25rem solid var(--success-color);
}

.card-info {
    border-left: 0.25rem solid var(--info-color);
}

.card-warning {
    border-left: 0.25rem solid var(--warning-color);
}

.chart-container {
    position: relative;
    height: 300px;
}

/* Collapsed Sidebar */
.sidebar-collapsed #sidebar {
    width: var(--sidebar-collapsed-width);
}

.sidebar-collapsed #topbar {
    left: var(--sidebar-collapsed-width);
}

.sidebar-collapsed body {
    padding-left: var(--sidebar-collapsed-width);
}

.sidebar-collapsed .sidebar-brand span,
.sidebar-collapsed .sidebar-heading,
.sidebar-collapsed .nav-link span {
    display: none;
}

.sidebar-collapsed .sidebar-brand {
    justify-content: center;
    padding: 1rem;
}

.sidebar-collapsed .sidebar-brand img {
    margin-right: 0;
}

.sidebar-collapsed .nav-link {
    text-align: center;
    padding: 0.75rem 0.5rem;
}

.sidebar-collapsed .nav-link i {
    margin-right: 0;
    font-size: 1rem;
}

.sidebar-collapsed .sidebar-divider {
    margin: 0 0.5rem 1rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    body {
        padding-left: 0;
    }
    
    #sidebar {
        transform: translateX(-100%);
    }
    
    #topbar {
        left: 0;
    }
    
    #sidebar.active {
        transform: translateX(0);
    }
    
    .sidebar-collapsed #sidebar {
        width: var(--sidebar-width);
    }
    
    .sidebar-collapsed #topbar {
        left: 0;
    }
    
    .sidebar-collapsed body {
        padding-left: 0;
    }
}