*, *::before, *::after { box-sizing: border-box; }
:root { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }
html { scroll-behavior: smooth; scroll-padding-top: 6rem; }
body { margin: 0; color: var(--color-text-primary); background: var(--color-canvas); font-family: var(--font-sans); font-synthesis: none; line-height: 1.75; }
img { display: block; max-width: 100%; }
a { color: inherit; }
button { color: inherit; font: inherit; }
p { text-wrap: pretty; }
h1, h2, h3 { line-break: strict; text-wrap: balance; }
:focus-visible { outline: 3px solid var(--color-focus-ring); outline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 1rem; left: 1rem; z-index: 1000; padding: .75rem 1rem; color: var(--color-white); background: var(--color-blue-900); border-radius: var(--radius-sm); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }

.docs-header { position: sticky; top: 0; z-index: 100; border-bottom: 1px solid var(--color-border-subtle); background: color-mix(in srgb, var(--color-surface) 95%, transparent); backdrop-filter: blur(16px); }
.docs-header-inner { width: min(calc(100% - 2rem), 88rem); min-height: 5rem; margin: 0 auto; display: flex; align-items: center; gap: 2rem; }
.docs-brand img { width: 10rem; height: auto; }
.docs-header-nav { margin-left: auto; display: flex; align-items: center; gap: .25rem; }
.docs-header-nav a { min-height: 44px; padding: 0 .7rem; display: inline-flex; align-items: center; color: var(--color-text-secondary); border-radius: var(--radius-sm); font-size: .85rem; font-weight: 600; text-decoration: none; }
.docs-header-nav a:hover { color: var(--color-text-brand); background: var(--color-surface-soft); }
.theme-button { width: 44px; height: 44px; display: grid; place-items: center; border: 1px solid var(--color-border-subtle); border-radius: 50%; background: var(--color-surface); cursor: pointer; }

.docs-shell { width: min(100%, 88rem); margin: 0 auto; display: grid; grid-template-columns: 15rem minmax(0, 1fr); }
.docs-sidebar { height: calc(100vh - 5rem); padding: 2.5rem 1.5rem; position: sticky; top: 5rem; border-right: 1px solid var(--color-border-subtle); background: var(--color-surface); overflow-y: auto; }
.toc-label { margin: 0 0 1.25rem; color: var(--color-text-muted); font-size: .68rem; font-weight: 700; letter-spacing: .13em; }
.docs-toc { display: grid; gap: .2rem; }
.docs-toc a { min-height: 42px; padding: .55rem .65rem; display: grid; grid-template-columns: 1.7rem 1fr; align-items: center; color: var(--color-text-secondary); border-radius: var(--radius-sm); font-size: .85rem; text-decoration: none; }
.docs-toc a span { color: var(--color-text-muted); font-size: .68rem; font-variant-numeric: tabular-nums; }
.docs-toc a:hover, .docs-toc a[aria-current="true"] { color: var(--color-text-brand); background: var(--color-surface-soft); }
.docs-toc a[aria-current="true"] span { color: var(--color-text-brand); }
.toc-meta { margin-top: 2rem; padding-top: 1rem; display: grid; gap: .25rem; border-top: 1px solid var(--color-border-subtle); color: var(--color-text-muted); font-size: .7rem; }

.docs-main { min-width: 0; padding: 0 clamp(1.5rem, 4vw, 4rem); background: var(--color-surface); }
.docs-hero { max-width: 68rem; padding: clamp(5rem, 9vw, 8rem) 0; border-bottom: 1px solid var(--color-border-subtle); }
.docs-kicker { margin: 0 0 1rem; color: var(--color-text-brand); font-size: .72rem; font-weight: 700; letter-spacing: .14em; }
.docs-hero h1 { max-width: 13ch; margin: 0; font-size: var(--text-display); line-height: 1.15; }
.docs-hero > p:not(.docs-kicker) { max-width: 46rem; margin: 1.5rem 0 0; color: var(--color-text-secondary); font-size: 1.05rem; }
.docs-hero-meta { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: .5rem; }
.docs-hero-meta span { padding: .45rem .7rem; color: var(--color-text-secondary); border: 1px solid var(--color-border-subtle); border-radius: var(--radius-pill); font-size: .75rem; }

.guideline-section { max-width: 68rem; padding: clamp(5rem, 8vw, 7rem) 0; border-bottom: 1px solid var(--color-border-subtle); }
.section-title { margin-bottom: 1.5rem; display: grid; grid-template-columns: 3.5rem 1fr; align-items: start; gap: 1rem; }
.section-title > span { color: var(--color-text-brand); font-size: 1.1rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.section-title p { margin: 0 0 .35rem; color: var(--color-text-muted); font-size: .68rem; font-weight: 700; letter-spacing: .13em; }
.section-title h2 { margin: 0; font-size: var(--text-title); line-height: 1.25; }
.section-lead { max-width: 46rem; margin: 0 0 3rem 4.5rem; color: var(--color-text-secondary); }
.guideline-section > h3 { margin: 3.5rem 0 1.25rem; font-size: var(--text-heading); line-height: 1.3; }
.guideline-section h3 small { color: var(--color-text-muted); font-size: .8rem; font-weight: 400; }
.guidance-note { margin: 1rem 0 0; padding: 1rem; color: var(--color-text-secondary); border: 1px solid var(--color-border-subtle); background: var(--color-surface-soft); font-size: .85rem; }
code { padding: .15rem .35rem; color: var(--color-info-text); border-radius: .3rem; background: var(--color-info-surface); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .86em; }

.palette-group { margin-top: 3rem; }
.palette-group h3 { margin: 0 0 1rem; font-size: 1.1rem; }
.palette-group h3 small { margin-left: .5rem; color: var(--color-text-muted); font-size: .75rem; font-weight: 400; }
.swatch-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .65rem; }
.neutral-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.swatch { min-width: 0; padding: .75rem; display: grid; grid-template-columns: 2.5rem 1fr; grid-template-rows: auto auto; column-gap: .7rem; align-items: center; color: var(--color-text-primary); border: 1px solid var(--color-border-subtle); border-radius: var(--radius-sm); background: var(--color-surface); text-align: left; cursor: copy; }
.swatch::before { content: ""; width: 2.5rem; height: 2.5rem; grid-row: 1 / 3; border: 1px solid color-mix(in srgb, var(--color-border-strong) 65%, transparent); border-radius: .45rem; background: var(--swatch); }
.swatch:hover { border-color: var(--color-action-primary); }
.swatch span { min-width: 0; color: var(--color-text-secondary); font-size: .68rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.swatch strong { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .74rem; }
.status-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .65rem; }
.status-grid > div { min-height: 7rem; padding: 1rem; display: flex; flex-direction: column; justify-content: flex-end; color: var(--color-text-primary); border: 1px solid var(--color-border-subtle); border-top: 2.5rem solid var(--status); border-radius: var(--radius-sm); background: var(--color-surface); }
.status-grid span { color: var(--color-text-secondary); font-size: .75rem; }
.status-grid strong { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .8rem; }
.dark-reference { margin-inline: calc(clamp(1.5rem, 4vw, 4rem) * -1); padding-inline: clamp(1.5rem, 4vw, 4rem); max-width: none; background: color-mix(in srgb, var(--color-surface-soft) 45%, var(--color-surface)); }

.contrast-legend { margin: 0 0 2rem 4.5rem; display: flex; flex-wrap: wrap; gap: .5rem; }
.semantic-map { border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); overflow: hidden; }
.semantic-map > div { min-height: 3.5rem; padding: .75rem 1rem; display: grid; grid-template-columns: 1.2fr 1fr 1fr; align-items: center; gap: 1rem; border-bottom: 1px solid var(--color-border-subtle); }
.semantic-map > div:last-child { border-bottom: 0; }
.semantic-map span { display: flex; align-items: center; gap: .55rem; color: var(--color-text-secondary); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .78rem; }
.semantic-map i { width: 1.5rem; height: 1.5rem; flex: 0 0 1.5rem; border: 1px solid var(--color-border-strong); border-radius: 50%; background: var(--role); }
.semantic-head { color: var(--color-text-muted); background: var(--color-surface-soft); font-size: .72rem; }
.badge { width: fit-content; padding: .25rem .5rem; display: inline-flex; border-radius: var(--radius-pill); font-size: .68rem; font-style: normal; font-weight: 600; }
.badge.pass { color: var(--color-success-text); background: var(--color-success-surface); }
.badge.limited { color: var(--color-warning-text); background: var(--color-warning-surface); }
.badge.legacy { color: var(--color-info-text); background: var(--color-info-surface); }
.contrast-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .75rem; }
.contrast-card { display: grid; grid-template-columns: 7rem 1fr; overflow: hidden; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); background: var(--color-surface); }
.contrast-preview { min-height: 8rem; padding: 1rem; display: grid; align-content: center; gap: .65rem; color: var(--fg); background: var(--bg); font-size: 0; }
.contrast-preview::before { content: "正文 Aa · 16px / 400"; font-size: 1rem; font-weight: 400; }
.contrast-preview::after { content: "大字 Aa · 24px / 700"; font-size: 1.5rem; font-weight: 700; }
.contrast-card:has(.badge.limited) .contrast-preview::before { content: "✕ 正文 Aa · 16px / 400"; opacity: .7; text-decoration: line-through; text-decoration-thickness: 2px; }
.contrast-card > div:last-child { padding: 1rem; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; }
.contrast-card strong { font-size: .85rem; }
.contrast-card span { margin: .25rem 0 .6rem; color: var(--color-text-secondary); font-size: .8rem; }
.production-callout { margin-top: 3rem; padding: 1.5rem; display: grid; grid-template-columns: 2.75rem 1fr; gap: 1rem; color: var(--color-info-text); border: 1px solid color-mix(in srgb, var(--color-info-text) 28%, transparent); border-radius: var(--radius-md); background: var(--color-info-surface); }
.production-callout > div:first-child { width: 2.75rem; height: 2.75rem; display: grid; place-items: center; color: var(--color-info-surface); border-radius: 50%; background: var(--color-info-text); }
.production-callout h3 { margin: 0; font-size: 1rem; }
.production-callout p { margin: .35rem 0 0; }

.type-principles, .metric-grid, .formula-grid, .icon-spec-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .75rem; }
.type-principles > div, .metric-grid > div, .formula-grid > div, .icon-spec-grid > div { min-height: 7rem; padding: 1rem; display: flex; flex-direction: column; justify-content: flex-end; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-sm); background: var(--color-surface); }
.type-principles strong, .metric-grid strong, .formula-grid strong, .icon-spec-grid strong { color: var(--color-text-brand); font-size: 1.1rem; }
.type-principles span, .metric-grid span, .formula-grid span, .icon-spec-grid span { color: var(--color-text-secondary); font-size: .75rem; }
.table-wrap { max-width: 100%; overflow-x: auto; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); }
table { width: 100%; min-width: 42rem; border-collapse: collapse; background: var(--color-surface); }
th, td { padding: .9rem 1rem; text-align: left; border-bottom: 1px solid var(--color-border-subtle); }
th { color: var(--color-text-muted); font-size: .72rem; letter-spacing: .08em; }
td { color: var(--color-text-secondary); font-size: .85rem; }
.type-h1 { color: var(--color-text-primary); font-size: 2.25rem; font-weight: 700; }
.type-h2 { color: var(--color-text-primary); font-size: 1.75rem; font-weight: 600; }
.type-h3 { color: var(--color-text-primary); font-size: 1.35rem; font-weight: 500; }
.type-aux { font-size: .875rem; }
.type-small { font-size: .75rem; }
.role-list { display: grid; gap: .6rem; }
.platform-fonts { margin-bottom: 1rem; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .75rem; }
.platform-fonts > div { padding: 1.25rem; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); background: var(--color-surface); }
.platform-fonts span { display: block; color: var(--color-text-brand); font-size: .7rem; font-weight: 700; letter-spacing: .08em; }
.platform-fonts strong { display: block; margin-top: .5rem; font-size: .95rem; }
.platform-fonts p { margin: .35rem 0 0; color: var(--color-text-secondary); font-size: .8rem; }
.role-list > div { padding: 1rem; display: grid; grid-template-columns: 7rem 10rem 1fr; gap: 1rem; align-items: center; border-bottom: 1px solid var(--color-border-subtle); }
.role-list span { color: var(--color-text-brand); font-weight: 600; }
.role-list strong { font-size: .85rem; }
.role-list p { margin: 0; color: var(--color-text-secondary); font-size: .82rem; }
.text-color-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .75rem; }
.text-color-grid > div { padding: 1rem; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-sm); }
.color-dot { width: 2rem; height: 2rem; margin-bottom: 1rem; display: block; border: 1px solid var(--color-border-subtle); border-radius: 50%; background: var(--dot); }
.text-color-grid strong { display: block; font-size: .85rem; }
.text-color-grid p { margin: .35rem 0 0; color: var(--color-text-secondary); font-size: .8rem; }

.grid-measure { padding: 1rem; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); background: var(--color-canvas); }
.grid-measure > span { display: block; margin-bottom: .75rem; color: var(--color-text-muted); font-size: .72rem; font-weight: 600; }
.grid-demo { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 24px; }
.grid-demo span { height: 4rem; display: grid; place-items: center; color: var(--color-text-brand); border: 1px solid color-mix(in srgb, var(--color-action-primary) 25%, transparent); border-radius: .35rem; background: var(--color-surface-soft); font-size: .7rem; }
.layout-patterns { display: grid; gap: .65rem; }
.layout-row { display: grid; gap: .65rem; }
.layout-row.one { grid-template-columns: 1fr; }.layout-row.two { grid-template-columns: repeat(2, 1fr); }.layout-row.three { grid-template-columns: repeat(3, 1fr); }.layout-row.four { grid-template-columns: repeat(4, 1fr); }
.layout-row span { min-height: 3.5rem; display: grid; place-items: center; color: var(--color-text-secondary); border: 1px solid var(--color-border-subtle); border-radius: var(--radius-sm); background: var(--color-surface); font-size: .75rem; }

.button-size-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .75rem; }
.button-size-row > div { min-height: 11rem; padding: 1rem; display: flex; flex-direction: column; align-items: flex-start; justify-content: space-between; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-sm); }
.button-size-row span { color: var(--color-text-secondary); font-size: .75rem; }
.button-size-row small { color: var(--color-text-muted); font-size: .68rem; }
.hit-target { width: max-content; min-width: 7.5rem; height: 44px; padding-inline: 4px; display: grid; place-items: center; position: relative; border: 1px dashed var(--color-border-strong); border-radius: var(--radius-sm); }
.hit-target.medium { height: 48px; }
.visual-button { min-width: 6.5rem; padding-inline: 1rem; display: inline-grid; place-items: center; color: var(--color-action-on-primary) !important; border-radius: var(--radius-sm); background: var(--color-action-primary); font-weight: 600; }
.visual-button.small { height: 32px; font-size: .8rem; }.visual-button.normal { height: 40px; font-size: .875rem; }.visual-button.medium { height: 48px; font-size: 1rem; }
.demo-button { min-width: 44px; min-height: 44px; padding-inline: 1.15rem; display: inline-flex; align-items: center; justify-content: center; gap: .4rem; color: var(--color-action-on-primary); border: 1px solid transparent; border-radius: var(--radius-sm); background: var(--color-action-primary); font-weight: 600; cursor: pointer; }
.demo-button.small { font-size: .8rem; }.demo-button.normal { font-size: .875rem; }.demo-button.medium { min-height: 48px; font-size: 1rem; }
.demo-button.outline { color: var(--color-text-brand); border-color: var(--color-action-primary); background: var(--color-surface); }
.demo-button.is-hover { background: var(--color-action-primary-hover); }.demo-button.outline.is-hover { color: var(--color-action-on-primary); background: var(--color-action-primary); }
.demo-button.is-pressed { background: var(--color-action-primary-pressed); }.demo-button.outline.is-pressed { color: var(--color-action-on-primary); background: var(--color-action-primary-pressed); }
.demo-button.is-disabled { color: var(--color-action-disabled-text); border-color: var(--color-border-subtle); background: var(--color-action-disabled-surface); }
.demo-button .material-symbols-rounded { font-size: 18px; }
.demo-button.is-focus { outline: 3px solid var(--color-focus-ring); outline-offset: 2px; }
.demo-button.is-loading { opacity: .82; }
.spinner { width: 1rem; height: 1rem; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; }
.button-state-scroll { width: 100%; overflow-x: auto; padding: 4px; }
.button-state-grid { min-width: 42rem; display: grid; grid-template-columns: 6rem repeat(3, minmax(8rem, 1fr)); gap: .65rem; align-items: center; }
.state-mapping { margin-bottom: 1.25rem; padding: 1.25rem; display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); background: var(--color-surface-soft); }
.state-mapping > span { margin-right: .5rem; color: var(--color-text-brand); font-size: .75rem; font-weight: 700; }
.state-mapping p { flex-basis: 100%; margin: .5rem 0 0; color: var(--color-text-secondary); font-size: .82rem; }
.button-state-grid > * { min-width: 0; }
.button-state-grid .demo-button { cursor: default; }
.state-head { color: var(--color-text-muted); font-size: .72rem; font-weight: 600; }
.state-name { color: var(--color-text-secondary); font-size: .8rem; }

.radius-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .75rem; }
.radius-grid > div { min-height: 13rem; padding: 1rem; display: flex; flex-direction: column; justify-content: flex-end; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); background: var(--color-surface); }
.radius-shape { width: 6rem; height: 6rem; margin-bottom: 1.25rem; display: block; border: 3px solid var(--color-action-primary); border-radius: var(--r) 0 0 0; background: var(--color-surface-soft); }
.radius-grid strong { color: var(--color-text-brand); font-weight: 700; }.radius-grid p { margin: .2rem 0 0; color: var(--color-text-secondary); font-size: .8rem; }
.concentric-demo { margin-top: 1rem; padding: 1.5rem; display: flex; align-items: center; gap: 1.5rem; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); }
.concentric-demo > div { width: 8rem; height: 6rem; padding: 4px; border-radius: 20px; background: var(--color-action-primary); }
.concentric-demo > div > div { width: 100%; height: 100%; display: grid; place-items: center; color: var(--color-text-primary); border-radius: 16px; background: var(--color-surface); font-size: .75rem; text-align: center; }.concentric-demo span { color: var(--color-text-secondary); }
.concentric-demo p { margin: 0; color: var(--color-text-secondary); }
.spacing-scale { display: grid; gap: .35rem; }
.spacing-scale > div { min-height: 2.75rem; padding: .35rem .75rem; display: grid; grid-template-columns: 7rem 2.5rem 1fr; align-items: center; gap: 1rem; border-bottom: 1px solid var(--color-border-subtle); }
.spacing-scale > div > span { width: var(--w); height: .85rem; display: block; border-radius: var(--radius-pill); background: var(--color-action-primary); }
.spacing-scale strong { font-variant-numeric: tabular-nums; }.spacing-scale small { color: var(--color-text-muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

.shadow-spec { display: grid; grid-template-columns: .75fr 1.25fr; gap: 2rem; align-items: center; }
.shadow-sample { min-height: 14rem; display: grid; place-items: center; border-radius: var(--radius-lg); background: var(--color-surface); box-shadow: 0 12px 32px rgba(55,65,81,.1); }
:root[data-theme="dark"] .shadow-sample { background: var(--color-surface-raised); box-shadow: 0 18px 48px rgba(144,169,255,.16); }
.shadow-spec dl { margin: 1.5rem 0 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: .5rem; }
.shadow-spec dl div { padding: .75rem; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-sm); }.shadow-spec dt { color: var(--color-text-muted); font-size: .7rem; }.shadow-spec dd { margin: .15rem 0 0; font-size: .85rem; }
.material-demo { overflow: hidden; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); }
.material-bg { min-height: 16rem; padding: 2rem; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); place-items: center; gap: 1rem; background: linear-gradient(135deg, #1B41C5, #0922E7 55%, #80DA0A); }
.glass { width: 100%; min-height: 9rem; padding: 1rem; display: flex; flex-direction: column; align-items: center; justify-content: center; color: #07112B; border: 1px solid rgba(255,255,255,.65); border-radius: var(--radius-lg); background: rgba(255,255,255,.58); -webkit-backdrop-filter: blur(18px) saturate(125%); backdrop-filter: blur(18px) saturate(125%); text-align: center; }
.glass.liquid { background: linear-gradient(145deg, rgba(255,255,255,.78), rgba(255,255,255,.42)); box-shadow: inset 0 1px 0 rgba(255,255,255,.95), inset 0 -1px 0 rgba(255,255,255,.28), 0 14px 30px rgba(7,17,43,.16); -webkit-backdrop-filter: blur(10px) saturate(155%); backdrop-filter: blur(10px) saturate(155%); }.glass span { font-size: .75rem; }
.material-demo > p { margin: 0; padding: 1rem; color: var(--color-text-secondary); font-size: .82rem; }

.icon-row { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: .6rem; }
.icon-row > div { min-height: 7rem; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .5rem; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-sm); background: var(--color-surface); }
.icon-row .material-symbols-rounded { color: var(--color-text-brand); font-size: 28px; }.icon-row.filled .material-symbols-rounded { font-variation-settings: 'FILL' 1; }
.icon-row small { color: var(--color-text-muted); font-size: .65rem; }
.icon-size-row { min-height: 8rem; padding: 1rem; display: flex; align-items: center; justify-content: space-around; border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); }
.icon-size-row span { color: var(--color-text-brand); font-family: 'Material Symbols Rounded'; }
.external-resource { min-height: 44px; margin-top: 1.5rem; display: inline-flex; align-items: center; gap: .5rem; color: var(--color-text-brand); font-weight: 600; }

.docs-footer { margin: 5rem calc(clamp(1.5rem, 4vw, 4rem) * -1) 0; padding: 3rem clamp(1.5rem, 4vw, 4rem); display: flex; align-items: flex-end; justify-content: space-between; gap: 2rem; color: var(--color-white); background: var(--color-blue-900); }
.docs-footer img { width: 11rem; }.docs-footer div { display: flex; flex-direction: column; align-items: flex-end; color: var(--color-gray-300); font-size: .72rem; }
.copy-status { min-height: 1.5rem; margin: 0; position: fixed; right: 1rem; bottom: 1rem; padding: .65rem .8rem; color: var(--color-white); border-radius: var(--radius-sm); background: var(--color-blue-900); font-size: .75rem; opacity: .94; }

@media (max-width: 1050px) {
  .docs-shell { grid-template-columns: 1fr; }
  .docs-sidebar { height: auto; padding: .75rem 1rem; top: 5rem; z-index: 50; border-right: 0; border-bottom: 1px solid var(--color-border-subtle); overflow-x: auto; }
  .toc-label, .toc-meta { display: none; }
  .docs-toc { display: flex; width: max-content; }
  .docs-toc a { grid-template-columns: auto auto; gap: .35rem; }
  .swatch-grid, .neutral-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-demo { grid-template-columns: repeat(8, minmax(0, 1fr)); }
  .grid-demo span:nth-child(n+9) { display: none; }
}

@media (max-width: 760px) {
  .docs-header-inner { min-height: 4.5rem; gap: .5rem; }
  .docs-brand img { width: 8rem; }
  .docs-header-nav a:not(:first-child) { display: none; }
  .docs-header-nav { margin-left: auto; }
  .docs-sidebar { top: 4.5rem; }
  .docs-main { padding-inline: 1rem; }
  .docs-hero { padding: 4rem 0; }
  .guideline-section { padding: 4.5rem 0; }
  .section-title { grid-template-columns: 2.5rem 1fr; }
  .section-lead, .contrast-legend { margin-left: 0; }
  .swatch-grid, .neutral-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .status-grid, .type-principles, .metric-grid, .formula-grid, .icon-spec-grid, .radius-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contrast-grid, .text-color-grid, .button-size-row, .shadow-spec { grid-template-columns: 1fr; }
  .role-list > div { grid-template-columns: 5rem 1fr; }.role-list p { grid-column: 1 / -1; }
  .platform-fonts { grid-template-columns: 1fr; }
  .grid-demo { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
  .grid-demo span:nth-child(n+5) { display: none; }
  .layout-row.four { grid-template-columns: repeat(2, 1fr); }
  .button-state-grid { min-width: 42rem; }
  .spacing-scale > div { grid-template-columns: 6.5rem 2rem 1fr; gap: .75rem; }
  .material-bg { grid-template-columns: 1fr; }
  .icon-row { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .docs-footer { flex-direction: column; align-items: flex-start; }.docs-footer div { align-items: flex-start; }
  .copy-status { display: none; }
}

@media (max-width: 430px) {
  .swatch-grid, .neutral-grid, .status-grid { grid-template-columns: 1fr; }
  .contrast-card { grid-template-columns: 5.5rem 1fr; }
  .contrast-preview { min-height: 7rem; }
  .type-principles, .metric-grid, .formula-grid, .icon-spec-grid, .radius-grid { grid-template-columns: 1fr; }
  .concentric-demo { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; } }
@media (forced-colors: active) { .swatch, .status-grid > div, .contrast-card, .glass { border: 1px solid CanvasText; } }

/* Brand-site alignment: the guidelines share the same spatial and component language as the homepage. */
body { background: var(--color-surface); }

.docs-shell {
  width: min(calc(100% - 3rem), var(--layout-content));
  margin: 0 auto;
  padding: 3rem 0 6rem;
  grid-template-columns: 13.5rem minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
}

.docs-sidebar {
  height: auto;
  max-height: calc(100vh - 7rem);
  top: 6.5rem;
  padding: 1.25rem;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-raised);
}
.docs-toc a { min-height: var(--layout-tap-target); font-size: .875rem; font-weight: 600; }

.docs-main { padding: 0; background: transparent; }

.docs-hero {
  min-height: 34rem;
  max-width: none;
  padding: clamp(4rem, 8vw, 7rem) clamp(2rem, 5vw, 4.5rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  isolation: isolate;
}

.docs-hero::before { content: none; }

.docs-hero h1 { max-width: 11.5ch; font-weight: 700; letter-spacing: 0; }
.docs-hero > p:not(.docs-kicker) { max-width: 40rem; line-height: 1.75; }

.guideline-section {
  max-width: none;
  padding: clamp(5.5rem, 9vw, 7.5rem) 0;
}

.section-title { grid-template-columns: 2.75rem 1fr; gap: .75rem; }
.section-title > span { font-size: .72rem; letter-spacing: .12em; }
.section-title p { color: var(--color-text-brand); }
.section-title h2 { max-width: 16ch; font-weight: 700; }
.section-lead { max-width: 42rem; margin-left: 3.5rem; font-size: 1rem; }

.palette-group,
.contrast-card,
.type-principles > div,
.metric-grid > div,
.formula-grid > div,
.icon-spec-grid > div,
.text-color-grid > div,
.button-size-row > div,
.concentric-demo,
.material-demo,
.icon-row > div,
.icon-size-row {
  border-radius: var(--radius-md);
}

.swatch-grid { gap: .75rem; }
.swatch {
  min-height: 8.5rem;
  padding: 1.15rem;
  grid-template-columns: 3.25rem minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: .9rem;
  align-content: center;
  border-radius: var(--radius-md);
  transition: border-color var(--motion-fast), transform var(--motion-fast) var(--motion-ease);
}
.swatch::before { width: 3.25rem; height: 3.25rem; grid-row: 1 / 3; border-radius: 50%; }
.swatch:hover { transform: translateY(-1px); }
.swatch span { font-size: .72rem; }
.swatch strong { font-size: .78rem; }

.status-grid > div { border-radius: var(--radius-md); }
.dark-reference {
  margin-inline: 0;
  padding-inline: clamp(1.5rem, 4vw, 3rem);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  background: var(--color-surface-soft);
}

.contrast-preview { min-height: 9rem; }
.guidance-note { border-radius: var(--radius-sm); }
.production-callout { border-radius: var(--radius-md); }

.copy-status { right: 1.5rem; bottom: 1.5rem; border-radius: var(--radius-sm); }

@media (max-width: 1180px) and (min-width: 1051px) {
  .swatch-grid, .neutral-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 1050px) {
  .docs-shell { width: min(calc(100% - 2rem), var(--layout-content)); padding-top: 1rem; gap: 0; }
  .docs-sidebar { max-height: none; top: 4.95rem; margin-bottom: 1rem; border-radius: var(--radius-sm); background: color-mix(in srgb, var(--color-surface) 94%, transparent); box-shadow: none; backdrop-filter: blur(16px); }
  .docs-toc { scroll-snap-type: x proximity; }
  .docs-toc a { scroll-snap-align: center; }
}

@media (max-width: 760px) {
  .docs-shell { width: min(calc(100% - 2rem), var(--layout-content)); padding-bottom: 4rem; }
  .docs-main { padding-inline: 0; }
  .docs-hero { min-height: 30rem; padding-inline: 1.5rem; border-radius: var(--radius-md); }
  .section-title { grid-template-columns: 2.25rem 1fr; }
  .section-lead { margin-left: 0; }
  .swatch { min-height: 8rem; }
  .dark-reference { padding-inline: 1rem; }
}