/**
 * Ring2All Documentation Portal
 * Sidebar Styles - Premium Design
 */

.sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 50;
    overflow: hidden;
}

/* Subtle gradient overlay */
.sidebar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(180deg, rgba(59, 130, 246, 0.03) 0%, transparent 100%);
    pointer-events: none;
    z-index: 0;
}

.sidebar-nav {
    position: relative;
    flex: 1;
    overflow-y: auto;
    padding: 20px 0;
    z-index: 1;
}

/* Scrollbar */
.sidebar-nav::-webkit-scrollbar {
    width: 6px;
}

.sidebar-nav::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

.sidebar-nav::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Section (Level 1) */
.nav-section {
    margin-bottom: 6px;
}

.nav-section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    width: calc(100% - 16px);
    margin: 0 8px;
    padding: 12px 14px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-fast);
}

.nav-section-header:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.nav-section-header i:first-child {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    opacity: 0.7;
}

.nav-section-header span {
    flex: 1;
}

.nav-section-header .nav-chevron {
    width: 16px;
    height: 16px;
    opacity: 0.5;
    transition: all var(--transition-fast);
}

.nav-section.active>.nav-section-header {
    color: var(--text-primary);
    background: rgba(59, 130, 246, 0.08);
}

.nav-section.active>.nav-section-header i:first-child {
    color: var(--primary);
    opacity: 1;
}

.nav-section.active>.nav-section-header .nav-chevron {
    transform: rotate(180deg);
    opacity: 0.7;
}

/* Section Content */
.nav-section-content {
    display: none;
    padding: 4px 0 8px 20px;
}

.nav-section.active>.nav-section-content {
    display: block;
    animation: slideDown 0.2s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Group (Level 2) */
.nav-group {
    margin: 2px 0;
}

.nav-group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: calc(100% - 16px);
    margin: 0 8px;
    padding: 10px 14px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-fast);
}

.nav-group-header:hover {
    color: var(--text-primary);
    background: rgba(59, 130, 246, 0.05);
}

.nav-group-header .nav-chevron {
    width: 14px;
    height: 14px;
    opacity: 0.4;
    transition: all var(--transition-fast);
}

.nav-group.active>.nav-group-header {
    color: var(--primary);
}

.nav-group.active>.nav-group-header .nav-chevron {
    transform: rotate(90deg);
    opacity: 0.7;
}

/* Group Content */
.nav-group-content {
    display: none;
    position: relative;
    padding-left: 16px;
    margin-left: 16px;
    margin-top: 4px;
    margin-bottom: 8px;
}

.nav-group-content::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary) 0%, transparent 100%);
    border-radius: var(--radius-full);
    opacity: 0.3;
}

.nav-group.active>.nav-group-content {
    display: block;
    animation: slideDown 0.2s ease-out;
}

/* Items (Level 3) */
.nav-item {
    display: block;
    padding: 8px 14px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 13px;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    position: relative;
}

.nav-item:hover {
    color: var(--text-primary);
    background: rgba(59, 130, 246, 0.05);
}

.nav-item.active {
    color: var(--primary);
    background: var(--primary-light);
    font-weight: 500;
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 60%;
    background: var(--primary);
    border-radius: var(--radius-full);
}

/* Direct items (Level 2 without children) */
.nav-section-content>.nav-item {
    padding: 10px 16px;
    margin: 0 8px;
    width: calc(100% - 16px);
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.sidebar-link:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.sidebar-link i {
    width: 18px;
    height: 18px;
    opacity: 0.7;
}

/* Version Badge */
.sidebar-version {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 11px;
    color: var(--text-muted);
}

.sidebar-version .version-dot {
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

/* Mobile Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 40;
}

@media (max-width: 768px) {
    .sidebar-overlay.open {
        display: block;
    }

    .sidebar {
        box-shadow: var(--shadow-lg);
    }
}