generated from boboko/starter
41 lines
1.5 KiB
CSS
41 lines
1.5 KiB
CSS
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/* ── Dropdown (Popover API) ──────────────────────────────────── */
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/* The panel is a [popover] → it renders in the top layer, so its
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containing block is the viewport, not the .dropdown wrapper, and
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CSS alone can't tie it to the trigger (anchor positioning isn't
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everywhere yet). The `dropdown` Stimulus controller measures the
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trigger on open and writes --dropdown-top/left/width here; the
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open/close animation below stays pure CSS. Opens on a click, so
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animating transform + opacity is CLS-safe. */
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.dropdown-panel {
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top: var(--dropdown-top, 0);
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left: var(--dropdown-left, 0);
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min-width: var(--dropdown-width, 0);
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opacity: 0;
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transform: translateY(-4px);
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transition:
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opacity 0.2s ease,
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transform 0.2s ease,
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display 0.2s allow-discrete,
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overlay 0.2s allow-discrete;
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}
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.dropdown-panel:popover-open {
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opacity: 1;
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transform: translateY(-1px);
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}
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@starting-style {
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.dropdown-panel:popover-open {
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opacity: 0;
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transform: translateY(-4px);
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}
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}
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/* Caret flips while the panel is open — :has() is the only route
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back up from the popover's :popover-open state to the caret. */
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.dropdown:has(.dropdown-panel:popover-open) .dropdown-caret {
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transform: rotate(180deg);
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}
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