.dropdown {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.dropdown__trigger {
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    width: 100%;
    height: var(--control-height);
    padding: 0 var(--space-3);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius);
    background: var(--color-bg);
    color: var(--color-text-base);
    font: inherit;
    font-size: var(--font-size-base);
    text-align: left;
    cursor: pointer;
    outline: none;
    -webkit-tap-highlight-color: transparent;
    transition:
        border-color var(--motion-base) var(--motion-ease),
        box-shadow var(--motion-base) var(--motion-ease);
}

.dropdown__trigger:hover,
.dropdown.is-open .dropdown__trigger {
    border-color: var(--color-text-muted);
}

.dropdown__trigger:focus-visible {
    outline: var(--focus-ring-width) solid var(--color-accent);
    outline-offset: var(--focus-ring-offset);
}

.dropdown__value {
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.dropdown__value--placeholder {
    color: var(--color-text-subtle);
}

.dropdown__chevron {
    flex: 0 0 var(--control-icon-size);
    color: var(--color-text-subtle);
    transition: transform var(--motion-pill) var(--ease-decelerate);
}

.dropdown.is-open .dropdown__chevron {
    transform: rotate(180deg);
    color: var(--color-text-muted);
}

/* grid-template-rows 0fr→1fr is a true height reveal with no JS height
   measuring; stays absolutely positioned so it overlays the layout. */
.dropdown__panel {
    position: absolute;
    top: calc(100% + var(--control-panel-gap));
    left: 0;
    right: 0;
    z-index: var(--z-popover);
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows var(--motion-pill) var(--ease-decelerate);
}

.dropdown.is-open .dropdown__panel {
    grid-template-rows: 1fr;
}

.dropdown__panel[hidden] {
    display: none;
}

/* min-height: 0 lets the grid track collapse to nothing; overflow turns
   the row tween into a clip-reveal and carries the surface + blur fade. */
.dropdown__panel-inner {
    position: relative;
    min-height: 0;
    overflow: hidden;
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius);
    background: var(--color-bg);
    box-shadow: var(--shadow-popover);
    opacity: 0;
    filter: blur(2px);
    transition:
        opacity var(--motion-pill) var(--ease-decelerate),
        filter var(--motion-pill) var(--ease-decelerate);
}

.dropdown.is-open .dropdown__panel-inner {
    opacity: 1;
    filter: blur(0);
}

.dropdown__panel-inner::before,
.dropdown__panel-inner::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    height: var(--space-5);
    z-index: 1;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--motion-base) var(--motion-ease);
}

.dropdown__panel-inner::before {
    top: 0;
    background: linear-gradient(to bottom, var(--color-bg), transparent);
}

.dropdown__panel-inner::after {
    bottom: 0;
    background: linear-gradient(to top, var(--color-bg), transparent);
}

.dropdown__panel-inner.has-fade-top::before,
.dropdown__panel-inner.has-fade-bottom::after {
    opacity: 1;
}

.dropdown__list {
    margin: 0;
    padding: var(--space-1) 0;
    list-style: none;
    max-height: min(var(--control-panel-max-height), 60vh);
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: thin;
    scrollbar-color: var(--color-border-strong) transparent;
}

.dropdown__list::-webkit-scrollbar {
    width: 10px;
}

.dropdown__list::-webkit-scrollbar-track {
    background: transparent;
}

/* The bg-coloured border + padding-box clip insets the thumb so the
   track reads as the panel surface and the bar looks slimmer. */
.dropdown__list::-webkit-scrollbar-thumb {
    background: var(--color-border-strong);
    border-radius: var(--radius-pill);
    border: 3px solid var(--color-bg);
    background-clip: padding-box;
}

.dropdown__list::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-subtle);
    border: 3px solid var(--color-bg);
    background-clip: padding-box;
}

@media (prefers-reduced-motion: reduce) {
    .dropdown__panel,
    .dropdown__panel-inner,
    .dropdown__panel-inner::before,
    .dropdown__panel-inner::after,
    .dropdown__chevron {
        transition: none !important;
    }

    .dropdown__panel-inner {
        filter: none;
    }
}

.dropdown__option {
    padding: var(--space-2) var(--space-3);
    color: var(--color-text-base);
    cursor: pointer;
    line-height: var(--line-snug);
    user-select: none;
    transition: background var(--motion-fast) var(--motion-ease);
}

.dropdown__option.is-highlighted {
    background: var(--color-divider);
}

.dropdown__option[aria-selected="true"] {
    color: var(--color-text-strong);
    font-weight: var(--font-weight-medium);
}

.dropdown__option--disabled {
    color: var(--color-text-subtle);
    cursor: not-allowed;
}

.dropdown__option--disabled[aria-selected="true"] {
    font-weight: var(--font-weight-regular);
}

.dropdown--small .dropdown__trigger {
    height: var(--control-height-sm);
    min-width: 64px;
    padding: 0 var(--space-3);
    font-size: var(--font-size-control);
    border-radius: var(--radius-sm);
}

.dropdown--small .dropdown__option {
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-control);
}

.build-selector {
    min-width: 200px;
}

@media (max-width: 900px) {
    .build-selector {
        width: 100%;
        max-width: 100%;
        min-width: 0;
    }
}