.entity-filter {
    position: relative;
    flex-shrink: 0;
}

.filter-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--text-muted);
    font-size: 0.85rem;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius);
    background: var(--surface-glass);
    padding: 0;
    cursor: pointer;
    transition: var(--transition);
}

.filter-toggle i {
    transition: filter var(--transition);
}

.filter-toggle:hover {
    color: var(--text-primary);
    border-color: var(--accent-border);
    background: var(--hover-ghost);
}

.filter-toggle:hover i {
    filter: drop-shadow(0 0 6px rgba(90, 159, 212, 0.35));
}

.filter-toggle--active,
.filter-toggle[aria-expanded="true"] {
    color: var(--accent-cyan);
    border-color: var(--accent-border);
    background: var(--accent-soft);
    box-shadow:
        inset 0 0 16px rgba(90, 159, 212, 0.12),
        0 0 20px rgba(90, 159, 212, 0.1);
}

.filter-toggle--active i,
.filter-toggle[aria-expanded="true"] i {
    filter: drop-shadow(0 0 8px rgba(90, 159, 212, 0.55));
}

/* Filter sidebar */

body.filter-sidebar-open {
    overflow: hidden;
}

.filter-sidebar-backdrop {
    position: fixed;
    inset: 0;
    z-index: 180;
    background: rgba(2, 4, 10, 0);
    display: flex;
    justify-content: flex-start;
    opacity: 0;
    pointer-events: none;
    transition:
        opacity var(--duration-normal) var(--ease-out),
        background var(--duration-normal) var(--ease-out);
}

.filter-sidebar-backdrop.is-open {
    opacity: 1;
    background: rgba(2, 4, 10, 0.55);
    pointer-events: auto;
}

.filter-sidebar-backdrop[hidden] {
    display: none !important;
}

.filter-sidebar {
    width: min(320px, 88vw);
    height: 100dvh;
    background: var(--bg-deep);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    box-shadow: 12px 0 40px rgba(0, 0, 0, 0);
    transform: translate3d(-100%, 0, 0);
    transition:
        transform var(--duration-normal) var(--ease-out),
        box-shadow var(--duration-normal) var(--ease-out);
    will-change: transform;
}

.filter-sidebar-backdrop.is-open .filter-sidebar {
    transform: translate3d(0, 0, 0);
    box-shadow:
        12px 0 40px rgba(0, 0, 0, 0.45),
        4px 0 48px rgba(90, 159, 212, 0.1);
}

.filter-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: calc(0.85rem + env(safe-area-inset-top)) 1rem 0.85rem;
    border-bottom: 1px solid var(--border-subtle);
    background: var(--header-glass);
    flex-shrink: 0;
}

.filter-sidebar-title {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: var(--letter-display);
    text-transform: uppercase;
    color: var(--text-primary);
}

.filter-sidebar-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
}

.filter-sidebar-close:hover {
    color: var(--accent-cyan);
    border-color: var(--accent-border);
}

.filter-sidebar-body {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0.75rem 0 calc(1rem + env(safe-area-inset-bottom));
    scrollbar-width: thin;
    scrollbar-color: rgba(90, 159, 212, 0.35) transparent;
}

.filter-option {
    display: block;
    width: 100%;
    padding: 0.65rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 0.875rem;
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
}

.filter-option:hover {
    background: var(--hover-ghost);
    color: var(--text-primary);
}

.filter-option.is-active {
    color: var(--accent-cyan);
    background: var(--accent-soft);
    box-shadow: inset 3px 0 0 var(--accent-cyan);
    text-shadow: 0 0 12px rgba(90, 159, 212, 0.25);
}

.filter-option--type {
    font-weight: 500;
    color: var(--text-muted);
}

.filter-option--type.is-active {
    color: var(--accent-cyan);
}

.filter-group {
    margin-top: 0.5rem;
}

.filter-group-label {
    padding: 0.75rem 1rem 0.35rem;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: var(--letter-label);
    text-transform: uppercase;
    color: var(--accent-cyan);
}

.filter-group .filter-option:not(.filter-option--type) {
    padding-left: 1.35rem;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.filter-group .filter-option:not(.filter-option--type).is-active,
.filter-group .filter-option:not(.filter-option--type):hover {
    color: var(--text-primary);
}

@media (prefers-reduced-motion: reduce) {
    .filter-sidebar-backdrop,
    .filter-sidebar {
        transition: none;
    }

    .filter-sidebar-backdrop.is-open .filter-sidebar {
        transform: none;
    }
}