/* ==========================================================================
   VTR Website - Sidebar CSS
   Fortinet-style Left Navigation
   ========================================================================== */

/* --------------------------------------------------------------------------
   Sidebar Container
   -------------------------------------------------------------------------- */
.sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background-color: var(--color-white);
    border-right: 1px solid var(--color-gray-200);
    overflow-y: auto;
    overflow-x: hidden;
    z-index: var(--z-sticky);
    transition: transform var(--transition-base);
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: var(--color-gray-100);
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--color-gray-300);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-400);
}

/* --------------------------------------------------------------------------
   Sidebar Navigation
   -------------------------------------------------------------------------- */
.sidebar-nav {
    padding: var(--spacing-md) 0;
}

.sidebar-section {
    margin-bottom: var(--spacing-xs);
}

.sidebar-section-title {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* --------------------------------------------------------------------------
   Navigation Items
   -------------------------------------------------------------------------- */
.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: var(--color-gray-700);
    text-decoration: none;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background-color: var(--color-gray-100);
    color: var(--color-primary);
}

.nav-link.active {
    background-color: rgba(47, 85, 151, 0.1);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}

.nav-link-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.nav-link-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    margin-right: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Expand/Collapse Arrow */
.nav-arrow {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
}

.nav-arrow svg {
    width: 12px;
    height: 12px;
    fill: currentColor;
}

.nav-item.expanded > .nav-link .nav-arrow {
    transform: rotate(90deg);
}

/* --------------------------------------------------------------------------
   Submenu (Nested Navigation)
   -------------------------------------------------------------------------- */
.nav-submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
    background-color: var(--color-gray-50);
}

.nav-item.expanded > .nav-submenu {
    max-height: 500px;
}

.nav-submenu .nav-link {
    padding-left: calc(var(--spacing-lg) + var(--spacing-lg));
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.nav-submenu .nav-link:hover {
    background-color: var(--color-gray-100);
    color: var(--color-primary);
}

.nav-submenu .nav-link.active {
    background-color: rgba(47, 85, 151, 0.08);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
}

/* Third level nesting */
.nav-submenu .nav-submenu .nav-link {
    padding-left: calc(var(--spacing-lg) + var(--spacing-xl) + var(--spacing-md));
}

/* --------------------------------------------------------------------------
   Sidebar Header (optional branding area)
   -------------------------------------------------------------------------- */
.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-gray-200);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

.sidebar-brand img {
    height: 32px;
    width: auto;
}

/* --------------------------------------------------------------------------
   Sidebar Footer
   -------------------------------------------------------------------------- */
.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-gray-200);
    margin-top: auto;
}

/* --------------------------------------------------------------------------
   Mobile Sidebar Overlay
   -------------------------------------------------------------------------- */
.sidebar-overlay {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: calc(var(--z-sticky) - 1);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* --------------------------------------------------------------------------
   Sidebar Toggle Button
   -------------------------------------------------------------------------- */
.sidebar-toggle {
    display: none;
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 56px;
    height: 56px;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    z-index: var(--z-fixed);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
    background-color: var(--color-primary-dark);
    transform: scale(1.05);
}

.sidebar-toggle svg {
    width: 24px;
    height: 24px;
}

/* --------------------------------------------------------------------------
   Navigation States
   -------------------------------------------------------------------------- */
/* Brand logos in nav */
.nav-brand-logo {
    width: 80px;
    height: auto;
    margin: var(--spacing-sm) var(--spacing-lg);
    object-fit: contain;
}

/* Divider */
.nav-divider {
    height: 1px;
    background-color: var(--color-gray-200);
    margin: var(--spacing-sm) var(--spacing-lg);
}

/* Badge for counts or status */
.nav-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 var(--spacing-xs);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: 10px;
}

/* --------------------------------------------------------------------------
   Products Overview Link
   -------------------------------------------------------------------------- */
.nav-overview {
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-gray-200);
}

.nav-overview .nav-link {
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
}

.nav-overview .nav-link:hover {
    background-color: rgba(47, 85, 151, 0.1);
}

/* --------------------------------------------------------------------------
   Responsive Sidebar
   See responsive.css for detailed media queries
   -------------------------------------------------------------------------- */