.cm-sidebar {
    /* Semantic Variables */
    --bg-surface: var(--neutral-1c);
    --bg-content: var(--neutral-21);
    --bg-hover: var(--neutral-25);
    --border-color: var(--neutral-25);
    
    --text-primary: var(--neutral-e0);
    --text-secondary: var(--neutral-a0);
    --text-tertiary: var(--neutral-75);
    
    --color-active: var(--brand-main);
    --bg-active: rgba(188, 254, 8, 0.1); /* transparent brand color */
    
    width: 100%;
    flex-shrink: 0;
}

[data-theme="light"] .cm-sidebar {
    --bg-surface: #ffffff;
    --bg-content: #f8f9fa;
    --bg-hover: #e9ecef;
    --border-color: #dee2e6;
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-tertiary: #adb5bd;
    --color-active: #212529;
    --bg-active: var(--brand-main);
}

/* Mobile Toggle */
.cm-sidebar__mobile-toggle {
    width: 100%;
    background-color: var(--bg-content);
    border: 1px solid var(--border-color);
    padding: 1.4rem 1.6rem;
    border-radius: 0.8rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: var(--font-size-14);
    color: var(--text-primary);
    margin-bottom: var(--gap-16);
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
}

.cm-sidebar__mobile-toggle:hover {
    background: var(--bg-hover);
    border-color: var(--color-active);
}

.cm-sidebar__mobile-toggle span {
    display: flex;
    align-items: center;
    gap: var(--gap-8);
}

/* Sidebar Content */
.cm-sidebar__content {
    background-color: var(--bg-content);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    overflow: hidden;
    display: none;
}

.cm-sidebar__content.open {
    display: block;
}

/* Sidebar Groups */
.cm-sidebar__group {
    border-bottom: 1px solid var(--border-color);
}

.cm-sidebar__group:last-child {
    border-bottom: none;
}

/* Accordion Button */
.cm-sidebar__accordion-btn {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.4rem 1.6rem;
    background: transparent;
    border: none;
    font-weight: 600;
    font-size: var(--font-size-14);
    color: var(--text-primary);
    cursor: pointer;
    transition: background 0.2s;
}

.cm-sidebar__accordion-btn:hover {
    background-color: var(--bg-hover);
}

/* Chevron */
.cm-sidebar__chevron {
    flex-shrink: 0;
    color: var(--text-tertiary);
    transition: transform 0.3s ease;
}

.cm-sidebar__accordion-btn--open .cm-sidebar__chevron {
    transform: rotate(90deg);
}

/* Accordion Content */
.cm-sidebar__accordion-content.hidden {
    display: none;
}

.cm-sidebar__accordion-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

/* Scroll Area */
.cm-sidebar__scroll-area {
    max-height: 28rem;
    overflow-y: auto;
    border-top: 1px solid var(--border-color);
}

.cm-sidebar__scroll-area::-webkit-scrollbar {
    width: 0.6rem;
}

.cm-sidebar__scroll-area::-webkit-scrollbar-track {
    background: var(--bg-hover);
}

.cm-sidebar__scroll-area::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 0.3rem;
}

.cm-sidebar__scroll-area::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Navigation Items */
.cm-sidebar__nav-item {
    display: block;
    padding: 1rem 2rem 1rem 2rem;
    font-size: 1.3rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s;
    border-left: 0.3rem solid transparent;
}

.cm-sidebar__nav-item:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.cm-sidebar__nav-item--active {
    background-color: var(--bg-active);
    color: var(--color-active);
    font-weight: 600;
    border-left-color: var(--color-active);
}

/* Responsive - Desktop */
@media (min-width: 1024px) {
    .cm-sidebar {
        position: sticky;
        top: 2.4rem;
    }
    
    .cm-sidebar__mobile-toggle {
        display: none;
    }
    
    .cm-sidebar__content {
        display: block;
    }
}