Andreas Reinhold / reiniandClaude Opus 5
21f8ed826c
Plan step 36 review of 76abdd62. The old view put the filled variant's
16px padding on its own summary and body; the stylesheet matched them as
descendants of any filled collapse, so a plain collapse nested inside
one took the padding too (and an open one turned every nested chevron).
Child combinators now tie each rule to its own <details>. The 12px gap is
a literal like alert.css's, not an average of two spacing tokens.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
100 lines
4.0 KiB
CSS
100 lines
4.0 KiB
CSS
/*
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* <x-collapse>: not an M3 component — M3 has expandable list items and menu expansion but no
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* standalone disclosure — built on the native `<details>` so it opens without script, keeps its
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* state through a Livewire morph, and is announced as a disclosure by the browser. Judged against
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* foundations rather than any M3 component spec (docs/audits/m3-alignment/containment.md, C-24).
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*
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* `interpolate-size: allow-keywords` makes `<details>`'s `0 -> auto` block-size an animatable pair,
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* so `::details-content` (the pseudo-element that holds everything after the summary) can transition
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* `block-size` on the fast spatial spring, the same one that turns the chevron; `content-visibility`
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* goes with it, `allow-discrete`, so the content stays rendered while it closes rather than
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* vanishing on the first frame. Under reduced motion the duration token is zero
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* (tokens/motion.css), so the section snaps open with nothing else to do.
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*
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* `data-md-variant="filled"` is a surface-container tile with a large corner; the summary inherits
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* it (`border-radius: inherit`) so the shared `md-state-layer`'s own `::before`, which also
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* inherits, draws inside the same shape. `md-state-layer` and `md-focus-ring`
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* (foundation/interaction.css) sit on the summary; this file only refines their target — the
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* 48px summary height, the icon and chevron colour — never their opacities or ring.
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*
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* Icon-to-title and title-to-chevron gaps are a literal 12px: the measurement scale has no 12
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* (`space125` is 10px), as alert.css's gap. Every part is matched as its own `<details>`' child, so
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* a collapse nested in a filled one takes neither its padding nor its turned chevron.
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*/
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@layer material.reset, material.tokens, material.base, material.layout, material.components, material.text, material.visibility;
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@import './icon.css';
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@layer material.components {
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[data-md-collapse] {
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interpolate-size: allow-keywords;
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}
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[data-md-collapse][data-md-variant='filled'] {
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border-radius: var(--md-sys-shape-corner-lg);
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background-color: var(--md-sys-color-surface-container);
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}
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[data-md-collapse]::details-content {
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block-size: 0;
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overflow: hidden;
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transition:
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block-size var(--md-sys-motion-spatial-fast-duration) var(--md-sys-motion-spatial-fast),
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content-visibility var(--md-sys-motion-spatial-fast-duration) allow-discrete;
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}
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[data-md-collapse][open]::details-content {
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block-size: auto;
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}
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[data-md-collapse-summary] {
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display: flex;
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min-block-size: var(--md-sys-measurement-space600);
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align-items: center;
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gap: 12px;
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border-radius: inherit;
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cursor: pointer;
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list-style-type: none;
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font: var(--md-sys-typescale-title-md);
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letter-spacing: var(--md-sys-typescale-title-md-tracking);
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&::-webkit-details-marker {
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display: none;
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}
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}
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[data-md-collapse][data-md-variant='filled'] > [data-md-collapse-summary] {
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padding-inline: var(--md-sys-measurement-space200);
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}
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[data-md-collapse-icon] {
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color: var(--md-sys-color-on-surface-variant);
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}
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[data-md-collapse-title] {
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min-width: 0;
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flex: 1 1 0%;
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}
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[data-md-collapse-chevron] {
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color: var(--md-sys-color-on-surface-variant);
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transition: rotate var(--md-sys-motion-spatial-fast-duration) var(--md-sys-motion-spatial-fast);
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}
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[data-md-collapse][open] > [data-md-collapse-summary] > [data-md-collapse-chevron] {
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rotate: 180deg;
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}
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[data-md-collapse-body] {
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padding-block: var(--md-sys-measurement-space50) var(--md-sys-measurement-space200);
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color: var(--md-sys-color-on-surface-variant);
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font: var(--md-sys-typescale-body-md);
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letter-spacing: var(--md-sys-typescale-body-md-tracking);
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}
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[data-md-collapse][data-md-variant='filled'] > [data-md-collapse-body] {
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padding-inline: var(--md-sys-measurement-space200);
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}
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}
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