/* ===== Navigation: Icon Rail + Category Panel ===== */

/* --- aside container --- */
aside {
    width: auto;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: row;
    height: 100%;
    padding: 0;
    position: relative;
    overflow: visible;
}

/* --- Icon Rail --- */
.icon-rail {
    width: 48px;
    min-width: 48px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.6rem 0;
    gap: 2px;
    background: var(--bg-panel);
    border-right: 1px solid var(--border);
    z-index: 2;
    position: relative;
}

.rail-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    color: var(--text-dim);
    font-size: 1.1rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    position: relative;
}

.rail-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.04);
}

.rail-btn.active,
.rail-btn.rail-category.active {
    color: var(--accent);
    background: rgba(201, 168, 76, 0.08);
}

/* Active indicator bar */
.rail-btn.rail-category.active::before {
    content: '';
    position: absolute;
    left: -1px;
    top: 6px;
    bottom: 6px;
    width: 2px;
    background: var(--accent);
    border-radius: 0 2px 2px 0;
}

/* Brand button */
.rail-btn.rail-brand {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    color: var(--accent);
    font-weight: 700;
    letter-spacing: 0;
    margin-bottom: 0.25rem;
    opacity: 0.85;
    transition: opacity var(--transition-fast);
}

.rail-btn.rail-brand:hover {
    opacity: 1;
    background: rgba(201, 168, 76, 0.06);
}

.rail-divider {
    width: 22px;
    height: 1px;
    background: var(--border);
    margin: 0.35rem 0;
}

.rail-spacer {
    flex: 1;
}

/* --- Category Panel --- */
.category-panel {
    width: 260px;
    display: flex;
    flex-direction: column;
    background: var(--bg-surface, var(--bg-panel));
    overflow: hidden;
    transition: width 0.25s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.2s ease;
    position: relative;
}

aside.panel-collapsed .category-panel {
    width: 0;
    min-width: 0;
    opacity: 0;
    pointer-events: none;
}

/* --- Panel Header Bar (collapse button) --- */
.panel-header-bar {
    display: flex;
    align-items: center;
    padding: 0.3rem 0.4rem;
    border-bottom: 1px solid var(--border);
    background: var(--bg-panel);
    min-height: 32px;
    flex-shrink: 0;
}

.panel-header-spacer {
    flex: 1;
}

.panel-collapse-btn {
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0.3rem 0.5rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    line-height: 1;
}

.panel-collapse-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

/* Legacy panel-tab classes (keep for JS compat) */
.panel-tab {
    display: none;
}

/* --- Panel Search --- */
.panel-search {
    padding: 0.5rem 0.6rem;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.panel-search input {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.4rem 0.65rem;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-family: var(--font-body);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.panel-search input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.panel-search input::placeholder {
    color: var(--text-dim);
}

/* --- Panel Content --- */
.panel-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.panel-content::-webkit-scrollbar {
    width: 4px;
}

.panel-content::-webkit-scrollbar-track {
    background: transparent;
}

.panel-content::-webkit-scrollbar-thumb {
    background-color: var(--border);
    border-radius: 2px;
}

/* --- Category Panes --- */
.category-pane {
    display: none;
    padding: 0 0.5rem 5rem 0.5rem;
}

.category-pane.active {
    display: block;
}

/* Pane Header */
.pane-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 0.25rem 0.4rem 0.25rem;
    position: sticky;
    top: 0;
    background: var(--bg-surface, var(--bg-panel));
    z-index: 5;
}

.pane-title {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-dim);
    font-weight: 600;
}

.pane-actions {
    display: flex;
    gap: 0.25rem;
    align-items: center;
}

.pane-actions .add-btn {
    font-size: 0.9rem;
    padding: 2px 4px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.pane-actions .add-btn:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* --- Override old sidebar styles that conflict --- */

/* Remove old sidebar-header/brand/actions/category-list/category-group styling */
.sidebar-header,
.sidebar-brand,
.sidebar-actions,
.category-list,
.category-group,
.category-title {
    /* These elements no longer exist, but just in case of residual matching */
    display: none;
}

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
    aside {
        position: fixed;
        width: auto;
        max-width: 85%;
        height: 100%;
        top: 0;
        left: -100%;
        z-index: 1005;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.6);
        transition: left 0.3s ease-in-out;
        flex-direction: row;
    }

    aside.show-sidebar {
        left: 0;
    }

    /* On mobile, don't allow collapsing the panel when sidebar is visible */
    aside.show-sidebar.panel-collapsed .category-panel {
        width: 260px;
        opacity: 1;
        pointer-events: auto;
    }

    .icon-rail {
        width: 44px;
        min-width: 44px;
    }

    .rail-btn {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }

    .category-panel {
        width: 240px;
    }
}