/* TendUI 2026.1.0 | MIT | Original semantic CSS for Go interfaces.
   Authored as plain CSS. No imports, web fonts, scripts, or build pipeline. */

/* Theme tokens. Override these in a stylesheet loaded after TendUI. */
:root {
  --tendui-duration-fast: 160ms;
  --tendui-duration-enter: 320ms;
  --tendui-duration-loading: 1200ms;
  --tendui-stagger-step: 80ms;
  --tendui-lift-distance: -2px;
  --tendui-ease-out: cubic-bezier(.2, .8, .2, 1);
  color-scheme: light;
  --tendui-font: var(--tendui-font-sans);
  --tendui-mono: ui-monospace, "SFMono-Regular", Consolas, monospace;
  --tendui-leading-body: 1.6;
  --tendui-leading-heading: 1.2;
  --tendui-heading-1: clamp(2.25rem, 5vw, 4rem);
  --tendui-heading-2: clamp(1.65rem, 3vw, 2.4rem);
  --tendui-heading-3: 1.35rem;
  --tendui-prose-narrow: 55ch;
  --tendui-prose-standard: 65ch;
  --tendui-prose-wide: 80ch;
  --tendui-prose-leading: 1.75;
  --tendui-prose-space: 1.25rem;
  --tendui-prose-heading-gap: 2.25rem;
  --tendui-background: #f7f8fc;
  --tendui-surface: #ffffff;
  --tendui-subtle: #eef1f8;
  --tendui-text: #20283e;
  --tendui-muted: #56627a;
  --tendui-border: #7b879c;
  --tendui-primary: var(--tendui-accent-light);
  --tendui-primary-hover: var(--tendui-accent-hover-light);
  --tendui-on-primary: #ffffff;
  --tendui-danger: #b42332;
  --tendui-info: #1d4ed8;
  --tendui-success: #166534;
  --tendui-warning: #854d0e;
  --tendui-focus: var(--tendui-primary);
  --tendui-radius: 0.65rem;
  --tendui-space: 1rem;
  --tendui-space-xs: calc(var(--tendui-space) * .25);
  --tendui-space-sm: calc(var(--tendui-space) * .5);
  --tendui-space-md: var(--tendui-space);
  --tendui-space-lg: calc(var(--tendui-space) * 1.5);
  --tendui-space-xl: calc(var(--tendui-space) * 2);
  --tendui-shadow: var(--tendui-elevation-raised);
  --tendui-content-width: 72rem;
  font-family: var(--tendui-font);
  font-size: var(--tendui-text-size);
  line-height: var(--tendui-leading-body);
  text-size-adjust: 100%;
}

/* Appearance tokens: shared by native attributes and exported CSS overrides. */
:root {
  --tendui-preset-indigo-light: #4f46c8;
  --tendui-preset-indigo-hover-light: #3f36aa;
  --tendui-preset-indigo-dark: #b1a7ff;
  --tendui-preset-indigo-hover-dark: #cdc6ff;
  --tendui-preset-indigo-on-dark: #18132f;
  --tendui-preset-neutral-light: #475569;
  --tendui-preset-neutral-hover-light: #334155;
  --tendui-preset-neutral-dark: #cbd5e1;
  --tendui-preset-neutral-hover-dark: #e2e8f0;
  --tendui-preset-neutral-on-dark: #17202d;
  --tendui-preset-forest-light: #166534;
  --tendui-preset-forest-hover-light: #14532d;
  --tendui-preset-forest-dark: #86efac;
  --tendui-preset-forest-hover-dark: #bbf7d0;
  --tendui-preset-forest-on-dark: #10291b;
  --tendui-preset-rose-light: #be123c;
  --tendui-preset-rose-hover-light: #9f1239;
  --tendui-preset-rose-dark: #fda4af;
  --tendui-preset-rose-hover-dark: #fecdd3;
  --tendui-preset-rose-on-dark: #3d1020;
  --tendui-density-comfortable-space: 1rem;
  --tendui-density-comfortable-control-y: .65rem;
  --tendui-density-comfortable-control-x: 1.1rem;
  --tendui-density-comfortable-control-height: 2.75rem;
  --tendui-density-comfortable-card-padding: clamp(1rem, 2.5vw, 1.75rem);
  --tendui-density-comfortable-grid-gap: 1.5rem;
  --tendui-density-compact-space: .75rem;
  --tendui-density-compact-control-y: .4rem;
  --tendui-density-compact-control-x: .8rem;
  --tendui-density-compact-control-height: 2.25rem;
  --tendui-density-compact-card-padding: 1rem;
  --tendui-density-compact-grid-gap: 1rem;
  --tendui-corners-rounded: .65rem;
  --tendui-corners-square: .15rem;
  --tendui-corners-soft: 1.15rem;
  --tendui-font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --tendui-font-serif: ui-serif, Georgia, Cambria, "Times New Roman", serif;
  --tendui-font-mono: ui-monospace, "SFMono-Regular", Consolas, monospace;
  --tendui-size-standard: clamp(1rem, .96rem + .2vw, 1.125rem);
  --tendui-size-large: clamp(1.125rem, 1.05rem + .3vw, 1.3rem);
  --tendui-width-standard: 72rem;
  --tendui-width-narrow: 52rem;
  --tendui-width-wide: 90rem;
  --tendui-elevation-raised: 0 .5rem 2rem rgb(25 35 65 / 6%);
  --tendui-elevation-flat: none;
  --tendui-elevation-subtle: 0 1px 3px rgb(25 35 65 / 8%);
  --tendui-elevation-floating: 0 .25rem .75rem rgb(25 35 65 / 8%), 0 1rem 3rem rgb(25 35 65 / 12%);
  --tendui-accent-light: var(--tendui-preset-indigo-light);
  --tendui-accent-hover-light: var(--tendui-preset-indigo-hover-light);
  --tendui-accent-dark: var(--tendui-preset-indigo-dark);
  --tendui-accent-hover-dark: var(--tendui-preset-indigo-hover-dark);
  --tendui-accent-on-dark: var(--tendui-preset-indigo-on-dark);
  --tendui-space: var(--tendui-density-comfortable-space);
  --tendui-control-y: var(--tendui-density-comfortable-control-y);
  --tendui-control-x: var(--tendui-density-comfortable-control-x);
  --tendui-control-height: var(--tendui-density-comfortable-control-height);
  --tendui-card-padding: var(--tendui-density-comfortable-card-padding);
  --tendui-grid-gap: var(--tendui-density-comfortable-grid-gap);
  --tendui-text-size: var(--tendui-size-standard);
}

:root:where([data-preset="indigo"]) {
  --tendui-accent-light: var(--tendui-preset-indigo-light);
  --tendui-accent-hover-light: var(--tendui-preset-indigo-hover-light);
  --tendui-accent-dark: var(--tendui-preset-indigo-dark);
  --tendui-accent-hover-dark: var(--tendui-preset-indigo-hover-dark);
  --tendui-accent-on-dark: var(--tendui-preset-indigo-on-dark);
}
:root:where([data-preset="neutral"]) {
  --tendui-accent-light: var(--tendui-preset-neutral-light);
  --tendui-accent-hover-light: var(--tendui-preset-neutral-hover-light);
  --tendui-accent-dark: var(--tendui-preset-neutral-dark);
  --tendui-accent-hover-dark: var(--tendui-preset-neutral-hover-dark);
  --tendui-accent-on-dark: var(--tendui-preset-neutral-on-dark);
}
:root:where([data-preset="forest"]) {
  --tendui-accent-light: var(--tendui-preset-forest-light);
  --tendui-accent-hover-light: var(--tendui-preset-forest-hover-light);
  --tendui-accent-dark: var(--tendui-preset-forest-dark);
  --tendui-accent-hover-dark: var(--tendui-preset-forest-hover-dark);
  --tendui-accent-on-dark: var(--tendui-preset-forest-on-dark);
}
:root:where([data-preset="rose"]) {
  --tendui-accent-light: var(--tendui-preset-rose-light);
  --tendui-accent-hover-light: var(--tendui-preset-rose-hover-light);
  --tendui-accent-dark: var(--tendui-preset-rose-dark);
  --tendui-accent-hover-dark: var(--tendui-preset-rose-hover-dark);
  --tendui-accent-on-dark: var(--tendui-preset-rose-on-dark);
}
:root:where([data-density="comfortable"]) {
  --tendui-space: var(--tendui-density-comfortable-space);
  --tendui-control-y: var(--tendui-density-comfortable-control-y);
  --tendui-control-x: var(--tendui-density-comfortable-control-x);
  --tendui-control-height: var(--tendui-density-comfortable-control-height);
  --tendui-card-padding: var(--tendui-density-comfortable-card-padding);
  --tendui-grid-gap: var(--tendui-density-comfortable-grid-gap);
}
:root:where([data-density="compact"]) {
  --tendui-space: var(--tendui-density-compact-space);
  --tendui-control-y: var(--tendui-density-compact-control-y);
  --tendui-control-x: var(--tendui-density-compact-control-x);
  --tendui-control-height: var(--tendui-density-compact-control-height);
  --tendui-card-padding: var(--tendui-density-compact-card-padding);
  --tendui-grid-gap: var(--tendui-density-compact-grid-gap);
}
:root:where([data-corners="rounded"]) { --tendui-radius: var(--tendui-corners-rounded); }
:root:where([data-corners="square"]) { --tendui-radius: var(--tendui-corners-square); }
:root:where([data-corners="soft"]) { --tendui-radius: var(--tendui-corners-soft); }
:root:where([data-typography="sans"]) { --tendui-font: var(--tendui-font-sans); }
:root:where([data-typography="serif"]) { --tendui-font: var(--tendui-font-serif); }
:root:where([data-typography="mono"]) { --tendui-font: var(--tendui-font-mono); }
:root:where([data-text-size="standard"]) { --tendui-text-size: var(--tendui-size-standard); }
:root:where([data-text-size="large"]) { --tendui-text-size: var(--tendui-size-large); }
:root:where([data-width="standard"]) { --tendui-content-width: var(--tendui-width-standard); }
:root:where([data-width="narrow"]) { --tendui-content-width: var(--tendui-width-narrow); }
:root:where([data-width="wide"]) { --tendui-content-width: var(--tendui-width-wide); }
:root:where([data-elevation="raised"]) { --tendui-shadow: var(--tendui-elevation-raised); }
:root:where([data-elevation="flat"]) { --tendui-shadow: var(--tendui-elevation-flat); }
:root:where([data-elevation="subtle"]) { --tendui-shadow: var(--tendui-elevation-subtle); }
:root:where([data-elevation="floating"]) { --tendui-shadow: var(--tendui-elevation-floating); }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    color-scheme: dark;
    --tendui-background: #111521;
    --tendui-surface: #1b2131;
    --tendui-subtle: #252e42;
    --tendui-text: #eef0f8;
    --tendui-muted: #aeb9ce;
    --tendui-border: #71809b;
    --tendui-primary: var(--tendui-accent-dark);
    --tendui-primary-hover: var(--tendui-accent-hover-dark);
    --tendui-on-primary: var(--tendui-accent-on-dark);
    --tendui-danger: #ff9caa;
    --tendui-info: #93c5fd;
    --tendui-success: #86efac;
    --tendui-warning: #fde047;
    --tendui-focus: var(--tendui-primary);
    --tendui-elevation-raised: 0 0.5rem 2rem rgb(0 0 0 / 16%);
    --tendui-elevation-subtle: 0 1px 3px rgb(0 0 0 / 24%);
    --tendui-elevation-floating: 0 .25rem .75rem rgb(0 0 0 / 20%), 0 1rem 3rem rgb(0 0 0 / 32%);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --tendui-background: #111521;
  --tendui-surface: #1b2131;
  --tendui-subtle: #252e42;
  --tendui-text: #eef0f8;
  --tendui-muted: #aeb9ce;
  --tendui-border: #71809b;
  --tendui-primary: var(--tendui-accent-dark);
  --tendui-primary-hover: var(--tendui-accent-hover-dark);
  --tendui-on-primary: var(--tendui-accent-on-dark);
  --tendui-danger: #ff9caa;
  --tendui-info: #93c5fd;
  --tendui-success: #86efac;
  --tendui-warning: #fde047;
  --tendui-focus: var(--tendui-primary);
  --tendui-elevation-raised: 0 0.5rem 2rem rgb(0 0 0 / 16%);
  --tendui-elevation-subtle: 0 1px 3px rgb(0 0 0 / 24%);
  --tendui-elevation-floating: 0 .25rem .75rem rgb(0 0 0 / 20%), 0 1rem 3rem rgb(0 0 0 / 32%);
}

/* Reset and document flow. Keep native control behavior and focus visibility. */
*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: var(--tendui-background); color: var(--tendui-text); }
[hidden] { display: none !important; }
img, video, svg { max-inline-size: 100%; vertical-align: middle; }
img, video { block-size: auto; }
button, input, select, textarea { font: inherit; }
button, input, select, textarea, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--tendui-focus); outline-offset: 3px; }
::selection { background: var(--tendui-primary); color: var(--tendui-on-primary); }

/* Page layout. .grid works for content as well as form fields. */
body > header, body > main, body > footer, .container {
  inline-size: min(100% - 2rem, var(--tendui-content-width));
  margin-inline: auto;
  padding-block: clamp(1.25rem, 3vw, 2.5rem);
}
body > header { border-block-end: 1px solid var(--tendui-border); }
body > footer { color: var(--tendui-muted); border-block-start: 1px solid var(--tendui-border); }
main { display: block; }
section + section { margin-block-start: 3rem; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr)); gap: var(--tendui-grid-gap); }
.grid > * { min-inline-size: 0; }
.stack > * + * { margin-block-start: var(--tendui-space); }
.cluster, nav, nav ul { display: flex; align-items: center; flex-wrap: wrap; gap: var(--tendui-space); }
nav { justify-content: space-between; }
nav ul { list-style: none; margin: 0; padding: 0; }

/* Typography and text semantics. */
h1, h2, h3, h4, h5, h6 { line-height: var(--tendui-leading-heading); margin: 0 0 1rem; text-wrap: balance; }
h1 { font-size: var(--tendui-heading-1); letter-spacing: -0.04em; }
h2 { font-size: var(--tendui-heading-2); letter-spacing: -0.025em; }
h3 { font-size: var(--tendui-heading-3); }
p, ul, ol, dl, blockquote, pre, table, figure { margin: 0 0 1.25rem; }
p, li, dd { overflow-wrap: break-word; }
small, .muted { color: var(--tendui-muted); }
a { color: var(--tendui-primary); text-underline-offset: 0.2em; }
a:hover { color: var(--tendui-primary-hover); }
hr { border: 0; border-block-start: 1px solid var(--tendui-border); margin-block: 2rem; }
blockquote { border-inline-start: 3px solid var(--tendui-primary); padding: 0.5rem 1.25rem; color: var(--tendui-muted); }
code, kbd, samp, pre { font-family: var(--tendui-mono); font-size: 0.9em; }
code, kbd { background: var(--tendui-subtle); padding: 0.15em 0.4em; border-radius: 0.3rem; }
pre { padding: 1rem; background: var(--tendui-subtle); border-radius: var(--tendui-radius); overflow: auto; }
pre code { padding: 0; }
mark { background: #f9e59b; color: #302708; padding-inline: 0.2em; }

/* Buttons: raw buttons receive the primary style; outline is composable. */
button, .button, input:is([type="submit"], [type="button"], [type="reset"]) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-block-size: var(--tendui-control-height);
  padding: var(--tendui-control-y) var(--tendui-control-x);
  border: 1px solid var(--tendui-primary);
  border-radius: var(--tendui-radius);
  background: var(--tendui-primary);
  color: var(--tendui-on-primary);
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}
:is(button, .button, input[type="submit"], input[type="button"], input[type="reset"]):hover {
  background: var(--tendui-primary-hover);
  border-color: var(--tendui-primary-hover);
  color: var(--tendui-on-primary);
}
.primary { border-color: var(--tendui-primary); }
:is(button, .button).outline { background: transparent; color: var(--tendui-primary); }
:is(button, .button).outline:hover { background: var(--tendui-subtle); }
:disabled { cursor: not-allowed; opacity: 0.6; }
.theme-toggle { margin: 0; }

/* Inline icons inherit text color, including forced-color and print palettes. */
.tendui-icon { display: inline-block; inline-size: 1.25em; block-size: 1.25em; flex: none; vertical-align: -.2em; }
.tendui-icon[data-size="small"] { inline-size: 1em; block-size: 1em; }
.tendui-icon[data-size="large"] { inline-size: 1.75em; block-size: 1.75em; }

/* Cards are plain articles; their header and footer are optional. */
article {
  margin-block: 0 1.5rem;
  padding: var(--tendui-card-padding);
  background: var(--tendui-surface);
  border: 1px solid var(--tendui-border);
  border-radius: var(--tendui-radius);
  box-shadow: var(--tendui-shadow);
}
article > header { margin-block-end: 1.25rem; padding-block-end: 1rem; border-block-end: 1px solid var(--tendui-border); }
article > footer { margin-block-start: 1.25rem; padding-block-start: 1rem; border-block-start: 1px solid var(--tendui-border); color: var(--tendui-muted); }
article > :last-child, article > header > :last-child, article > footer > :last-child { margin-block-end: 0; }

/* Card overrides have low specificity so surface and accessibility rules win.
   Change the actual shadow, not an inherited token, to keep nested cards independent. */
article:where([data-card-elevation="flat"]) { box-shadow: var(--tendui-elevation-flat); }
article:where([data-card-elevation="subtle"]) { box-shadow: var(--tendui-elevation-subtle); }
article:where([data-card-elevation="raised"]) { box-shadow: var(--tendui-elevation-raised); }
article:where([data-card-elevation="floating"]) { box-shadow: var(--tendui-elevation-floating); }

/* Forms: labels wrap controls, preserving names without synthesized IDs. */
form { margin-block-end: 1.5rem; }
label { display: block; margin-block-end: 1rem; font-weight: 500; }
input:not([type="checkbox"], [type="radio"], [type="submit"], [type="button"], [type="reset"], [type="hidden"]), select, textarea {
  display: block;
  inline-size: 100%;
  min-block-size: var(--tendui-control-height);
  margin-block-start: 0.4rem;
  padding: var(--tendui-control-y) var(--tendui-control-x);
  border: 1px solid var(--tendui-border);
  border-radius: var(--tendui-radius);
  background: var(--tendui-surface);
  color: var(--tendui-text);
}
input::placeholder, textarea::placeholder { color: var(--tendui-muted); opacity: 1; }
textarea { resize: vertical; min-block-size: 8rem; }
input:is([type="checkbox"], [type="radio"]) { inline-size: 1.15rem; block-size: 1.15rem; accent-color: var(--tendui-primary); vertical-align: middle; }
.check { display: flex; gap: 0.65rem; align-items: center; }
fieldset { min-inline-size: 0; margin: 0 0 1.5rem; padding: 1rem; border: 1px solid var(--tendui-border); border-radius: var(--tendui-radius); }
legend { padding-inline: 0.5rem; font-weight: 600; }
[aria-invalid="true"] { border-color: var(--tendui-danger) !important; }
label:has([aria-invalid="true"]) { color: var(--tendui-danger); }
progress { inline-size: 100%; accent-color: var(--tendui-primary); }

/* Native disclosure and tables need no behavior library. */
details { padding-block: 1rem; border-block-end: 1px solid var(--tendui-border); }
summary { cursor: pointer; font-weight: 600; }
details[open] > summary { margin-block-end: 1rem; }
table { inline-size: 100%; border-collapse: collapse; text-align: start; }
th, td { padding: var(--tendui-control-y) var(--tendui-control-x); border-block-end: 1px solid var(--tendui-border); text-align: start; }
th { font-weight: 600; }
tbody tr:nth-child(even) { background: var(--tendui-subtle); }
.table-scroll { overflow-x: auto; }

/* Optional HTMX hooks; styling only, no runtime is loaded by TendUI. */
.htmx-indicator { visibility: hidden; }
.htmx-request .htmx-indicator, .htmx-request.htmx-indicator { visibility: visible; }
[aria-busy="true"] { cursor: progress; }
.sr-only { position: absolute; inline-size: 1px; block-size: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}

/* Feedback uses semantic tones with text labels as well as color. */
[data-tone="neutral"] { --tendui-tone: var(--tendui-muted); }
[data-tone="info"] { --tendui-tone: var(--tendui-info); }
[data-tone="success"] { --tendui-tone: var(--tendui-success); }
[data-tone="warning"] { --tendui-tone: var(--tendui-warning); }
[data-tone="danger"] { --tendui-tone: var(--tendui-danger); }
.badge { display: inline-block; padding: .15em .6em; border: 1px solid currentColor; border-radius: var(--tendui-radius); color: var(--tendui-tone, var(--tendui-muted)); font-size: .8em; font-weight: 650; line-height: 1.5; }
.alert { padding: var(--tendui-space); margin-block-end: var(--tendui-space); border: 1px solid var(--tendui-border); border-inline-start: .3rem solid var(--tendui-tone, var(--tendui-info)); border-radius: var(--tendui-radius); background: var(--tendui-surface); }
.alert > :last-child { margin-block-end: 0; }
.alert > p:first-child > strong { color: var(--tendui-tone, var(--tendui-text)); }

/* Native switch semantics and keyboard interaction; checked state is not color-only. */
input[type="checkbox"][role="switch"] { appearance: none; flex: 0 0 auto; inline-size: 2.6rem; block-size: 1.5rem; border: 2px solid var(--tendui-border); border-radius: 2rem; background: var(--tendui-subtle); position: relative; cursor: pointer; }
input[role="switch"]::before { content: ""; position: absolute; inline-size: 1rem; block-size: 1rem; border-radius: 50%; inset-block-start: calc(50% - .5rem); inset-inline-start: .15rem; background: var(--tendui-text); }
input[role="switch"]:checked { background: var(--tendui-primary); border-color: var(--tendui-primary); }
input[role="switch"]:checked::before { inset-inline-start: calc(100% - 1.15rem); background: var(--tendui-on-primary); }
input[type="file"]::file-selector-button { margin-inline-end: .75rem; padding: .3rem .6rem; border: 1px solid var(--tendui-border); border-radius: var(--tendui-radius); background: var(--tendui-subtle); color: var(--tendui-text); cursor: pointer; font: inherit; }

/* Responsive application shell, including a native collapsible sidebar. */
.app-shell { display: grid; grid-template-columns: 15rem minmax(0, 1fr); grid-template-rows: auto 1fr; min-block-size: 100dvh; max-inline-size: calc(var(--tendui-content-width) + 15rem); margin-inline: auto; }
.app-header { grid-column: 1 / -1; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--tendui-space); padding: var(--tendui-space) 1.5rem; border-block-end: 1px solid var(--tendui-border); }
.app-brand { font-size: 1.25rem; font-weight: 750; text-decoration: none; }
.app-sidebar { padding: 1.5rem var(--tendui-space); background: var(--tendui-surface); border-inline-end: 1px solid var(--tendui-border); min-inline-size: 0; }
.app-sidebar details { padding: 0; border: 0; }
.app-sidebar nav, .app-sidebar nav ul { display: block; }
.app-sidebar nav a { display: flex; align-items: center; justify-content: space-between; gap: .5rem; padding: .7rem; margin-block: .2rem; border-radius: var(--tendui-radius); text-decoration: none; overflow-wrap: anywhere; }
.app-sidebar nav a:hover, .app-sidebar nav a[aria-current="page"] { background: var(--tendui-subtle); }
nav a[aria-current="page"] { font-weight: 750; text-decoration-thickness: .15em; }
.app-sidebar footer { margin-block-start: 2rem; color: var(--tendui-muted); }
.app-main { min-inline-size: 0; padding: clamp(1rem, 3vw, 2.5rem); }
.app-main > h1 { font-size: clamp(2rem, 4vw, 3rem); }
.skip-link { position: absolute; inset-inline-start: 1rem; inset-block-start: -10rem; z-index: 10; padding: .5rem 1rem; background: var(--tendui-surface); }
.skip-link:focus { inset-block-start: 1rem; }
button, .button { max-inline-size: 100%; overflow-wrap: anywhere; }
@media (max-width: 48rem) {
  .app-shell { grid-template-columns: minmax(0, 1fr); }
  .app-sidebar { border-inline-end: 0; border-block-end: 1px solid var(--tendui-border); }
}
@media (forced-colors: active) {
  input[type="checkbox"][role="switch"] { appearance: auto; inline-size: 1.2rem; block-size: 1.2rem; }
  input[role="switch"]::before { content: none; }
}
/* Native overlays. Leave display to the browser so closed dialogs/popovers stay hidden.
   On browsers without popover support the panel remains readable inline. */
.tendui-dialog, .tendui-popover {
  padding: 0;
  border: 1px solid var(--tendui-border);
  border-radius: var(--tendui-radius);
  background: var(--tendui-surface);
  color: var(--tendui-text);
  box-shadow: var(--tendui-shadow);
  inline-size: min(40rem, calc(100% - 2rem));
  max-block-size: calc(100dvh - 2rem);
  overflow: auto;
}
.tendui-popover { inline-size: min(28rem, calc(100% - 2rem)); margin: auto; }
.tendui-dialog::backdrop { background: rgb(0 0 0 / 60%); }
.overlay-header { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--tendui-space); padding: var(--tendui-card-padding); border-block-end: 1px solid var(--tendui-border); }
.overlay-header h2 { margin: 0; font-size: 1.35rem; overflow-wrap: anywhere; }
.overlay-close-form { margin: 0; }
.overlay-body, .overlay-footer { padding: var(--tendui-card-padding); }
.overlay-body > :last-child, .overlay-footer > :last-child { margin-block-end: 0; }
.overlay-footer { border-block-start: 1px solid var(--tendui-border); }

/* Navigation is ordinary links, including without HTMX or any scripting. */
.breadcrumbs { margin-block-end: 1.5rem; font-size: .9rem; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: .5rem; list-style: none; margin: 0; padding: 0; }
.breadcrumbs li { display: flex; gap: .5rem; align-items: baseline; }
.breadcrumb-separator { color: var(--tendui-muted); }
.pagination { margin-block-start: 1.25rem; }
.pagination ul { gap: .4rem; }
.pagination li > a, .pagination li > span { display: inline-flex; align-items: center; justify-content: center; min-block-size: var(--tendui-control-height); min-inline-size: 2.5rem; padding: var(--tendui-control-y) .8rem; border: 1px solid var(--tendui-border); border-radius: var(--tendui-radius); text-decoration: none; }
.pagination [aria-current="page"] { background: var(--tendui-primary); border-color: var(--tendui-primary); color: var(--tendui-on-primary); font-weight: 650; }
.pagination [aria-disabled="true"] { color: var(--tendui-muted); border-style: dashed; }
.pagination .pagination-gap { border: 0; min-inline-size: 1rem; padding-inline: .25rem; }
.pagination a:hover { background: var(--tendui-subtle); }
/* Expressive surfaces keep text on an opaque surface for predictable contrast. */
article[data-surface="tinted"] { background: var(--tendui-subtle); }
article[data-surface="outlined"] { border: 2px solid var(--tendui-primary); box-shadow: none; }
article[data-surface="gradient"] {
  border: 2px solid var(--tendui-primary);
  border-color: transparent;
  background: linear-gradient(var(--tendui-surface), var(--tendui-surface)) padding-box,
    linear-gradient(135deg, var(--tendui-primary), var(--tendui-border), var(--tendui-primary)) border-box;
}
.empty-state { padding: clamp(1.5rem, 5vw, 3rem); text-align: center; border: 1px dashed var(--tendui-border); border-radius: var(--tendui-radius); }
.empty-state p { max-inline-size: 48ch; margin-inline: auto; color: var(--tendui-muted); }
.stat { margin: 0; }
.stat dt { color: var(--tendui-muted); font-weight: 600; }
.stat dd { margin-inline: 0; }
.stat-value { font-size: clamp(2rem, 4vw, 3rem); font-weight: 750; line-height: 1.2; letter-spacing: -.04em; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; margin-block: .5rem; }
.stat-detail { color: var(--tendui-muted); font-size: .9rem; }
.skeleton small { display: block; margin-block-start: .75rem; color: var(--tendui-muted); }
.skeleton-shapes { display: grid; gap: .8rem; }
.skeleton-line, .skeleton-avatar { display: block; background: var(--tendui-subtle); border: 1px solid var(--tendui-border); border-radius: var(--tendui-radius); }
.skeleton-line { block-size: .9rem; }
.skeleton-line:last-child { inline-size: 65%; }
.skeleton-avatar { inline-size: 3rem; block-size: 3rem; border-radius: 50%; }

/* Motion is progressive enhancement. No content requires an animation to be seen.
   Explicit Off and exported CSS disable both duration and hover displacement. */
:root:where([data-motion="system"]) {
  --tendui-duration-fast: 160ms;
  --tendui-duration-enter: 320ms;
  --tendui-duration-loading: 1200ms;
  --tendui-stagger-step: 80ms;
  --tendui-lift-distance: -2px;
}
:root:where([data-motion="off"]) {
  --tendui-duration-fast: 0ms;
  --tendui-duration-enter: 0ms;
  --tendui-duration-loading: 0ms;
  --tendui-stagger-step: 0ms;
  --tendui-lift-distance: 0px;
}
@keyframes tendui-fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes tendui-rise { from { opacity: 0; transform: translateY(.5rem); } to { opacity: 1; transform: none; } }
@keyframes tendui-scale { from { opacity: 0; transform: scale(.98); } to { opacity: 1; transform: none; } }
@keyframes tendui-loading { 0%, 100% { opacity: 1; } 50% { opacity: .65; } }
@media (prefers-reduced-motion: no-preference) {
  button, .button, input, select, textarea, .pagination a {
    transition: background-color var(--tendui-duration-fast) ease,
      border-color var(--tendui-duration-fast) ease, box-shadow var(--tendui-duration-fast) ease;
  }
  [data-enter] { animation-duration: var(--tendui-duration-enter); animation-timing-function: var(--tendui-ease-out); animation-fill-mode: backwards; animation-iteration-count: 1; }
  [data-enter="fade"] { animation-name: tendui-fade; }
  [data-enter="rise"] { animation-name: tendui-rise; }
  [data-enter="scale"] { animation-name: tendui-scale; }
  [data-enter-delay="short"] { animation-delay: var(--tendui-stagger-step); }
  [data-enter-delay="medium"] { animation-delay: calc(var(--tendui-stagger-step) * 2); }
  [data-enter-delay="long"] { animation-delay: calc(var(--tendui-stagger-step) * 3); }
  article[data-hover="lift"] { transition: translate var(--tendui-duration-fast) var(--tendui-ease-out), box-shadow var(--tendui-duration-fast) ease; }
  article[data-hover="lift"]:focus-within { translate: 0 var(--tendui-lift-distance); }
  .tendui-dialog[open] { animation: tendui-rise var(--tendui-duration-enter) var(--tendui-ease-out); }
  .tendui-dialog[open]::backdrop { animation: tendui-fade var(--tendui-duration-fast) ease; }
  .tendui-popover:popover-open { animation: tendui-scale var(--tendui-duration-enter) var(--tendui-ease-out); }
  .skeleton-shapes { animation: tendui-loading var(--tendui-duration-loading) ease-in-out 3; }
}
@media (prefers-reduced-motion: no-preference) and (hover: hover) {
  article[data-hover="lift"]:hover { translate: 0 var(--tendui-lift-distance); }
}
@media (forced-colors: active) {
  article[data-surface="gradient"] { background: Canvas; border-color: CanvasText; }
  article, .tendui-dialog, .tendui-popover { box-shadow: none; }
  .skeleton-line, .skeleton-avatar { background: Canvas; border-color: CanvasText; }
}
/* Data tables retain native table/row/header semantics at every viewport width. */
.data-table { margin-block-end: .75rem; }
.data-table caption { font-weight: 650; text-align: start; padding-block-end: .75rem; }
.data-table [data-align="start"] { text-align: start; }
.data-table [data-align="center"] { text-align: center; }
.data-table [data-align="end"] { text-align: end; font-variant-numeric: tabular-nums; }
.data-table th { vertical-align: top; }
.data-table td { vertical-align: middle; }
.data-table .table-sort { display: inline-flex; align-items: baseline; gap: .4rem; text-underline-offset: .2em; }
.data-table tbody tr:nth-child(even) { background: transparent; }
.table-striped tbody tr:nth-child(even) { background: var(--tendui-subtle); }
.data-table tbody tr[data-selected="true"] { background: var(--tendui-subtle); outline: 2px solid var(--tendui-primary); outline-offset: -2px; }
.table-compact :is(th, td) { padding: .5rem .65rem; }
.table-selection { margin: 0; }
.data-table .empty-state { border: 0; }
.table-scroll { max-inline-size: 100%; }

/* Page navigation uses links; no scripted tablist keyboard contract. */
.tabs { margin-block-end: 1.5rem; border-block-end: 1px solid var(--tendui-border); }
.tabs ul { gap: .25rem; }
.tabs a, .tabs li > span { display: block; padding: .7rem 1rem; border-block-end: 3px solid transparent; text-decoration: none; }
.tabs [aria-current="page"] { border-block-end-color: var(--tendui-primary); color: var(--tendui-primary); font-weight: 750; }
.tabs a:hover { background: var(--tendui-subtle); }
.tabs [aria-disabled="true"] { color: var(--tendui-muted); border-block-end-style: dashed; border-block-end-color: var(--tendui-border); }
.steps { margin-block-end: 1.5rem; }
.steps ol { display: flex; flex-wrap: wrap; list-style: none; gap: 1rem; padding: 0; margin: 0; inline-size: 100%; }
.steps li { display: flex; align-items: center; gap: .65rem; flex: 1 1 12rem; padding-block: .75rem; border-block-end: 2px solid var(--tendui-border); }
.step-number { display: inline-grid; place-items: center; flex-shrink: 0; inline-size: 2rem; block-size: 2rem; border: 1px solid var(--tendui-border); border-radius: 50%; font-variant-numeric: tabular-nums; }
.steps [aria-current="step"] { border-color: var(--tendui-primary); font-weight: 750; }
.steps [aria-current="step"] .step-number { background: var(--tendui-primary); color: var(--tendui-on-primary); border-color: var(--tendui-primary); }
.steps [data-completed="true"] .step-number { border-style: double; border-width: 3px; }
.disclosure-body { padding-block-start: .75rem; }
.disclosure-body > :last-child { margin-block-end: 0; }
/* Composable fields connect labels, help and errors to a single native control. */
.field { min-inline-size: 0; margin-block-end: 1.25rem; }
.field > label { margin-block-end: .35rem; font-weight: 600; }
.field-description { display: block; margin-block-end: .5rem; color: var(--tendui-muted); }
.field-error { display: block; margin-block-start: .4rem; color: var(--tendui-danger); font-weight: 600; }
.input-group { display: flex; align-items: stretch; min-inline-size: 0; }
.input-group > :is(input, select) { flex: 1 1 auto; inline-size: 0; min-inline-size: 0; margin: 0; position: relative; }
.input-group > :is(input, select):focus { z-index: 1; }
.input-addon { display: flex; align-items: center; padding: var(--tendui-control-y) .75rem; background: var(--tendui-subtle); color: var(--tendui-muted); border: 1px solid var(--tendui-border); border-radius: var(--tendui-radius); overflow-wrap: anywhere; max-inline-size: 45%; }
.input-group > :not(:first-child) { border-start-start-radius: 0; border-end-start-radius: 0; }
.input-group > :not(:last-child) { border-start-end-radius: 0; border-end-end-radius: 0; }
.input-group > .input-addon:not(:first-child) { border-inline-start: 0; }
.input-group > .input-addon:first-child { border-inline-end: 0; }
.form-actions { margin-block-start: 1.5rem; }
.review-list > div { display: grid; grid-template-columns: minmax(8rem, 1fr) minmax(0, 2fr); gap: 1rem; padding-block: .85rem; border-block-end: 1px solid var(--tendui-border); }
.review-list dt { font-weight: 600; }
.review-list dd { margin: 0; overflow-wrap: anywhere; white-space: pre-wrap; }
@media (max-width: 36rem) {
 .review-list > div { grid-template-columns: minmax(0, 1fr); gap: .25rem; }
}

/* Opt-in composition. Each container owns its gap; nested flows start fresh.
   Existing .stack/.cluster utilities retain their original margin behavior. */
.layout-stack, .layout-cluster {
  display: flex;
  min-inline-size: 0;
  gap: var(--tendui-space-md);
  overflow-wrap: anywhere;
}
.layout-stack { flex-direction: column; align-items: stretch; }
.layout-cluster { flex-direction: row; flex-wrap: wrap; align-items: center; justify-content: flex-start; }
.layout-stack > *, .layout-cluster > * { min-inline-size: 0; max-inline-size: 100%; margin-block: 0; }
:is(.layout-stack, .layout-cluster)[data-gap="none"] { gap: 0; }
:is(.layout-stack, .layout-cluster)[data-gap="xs"] { gap: var(--tendui-space-xs); }
:is(.layout-stack, .layout-cluster)[data-gap="sm"] { gap: var(--tendui-space-sm); }
:is(.layout-stack, .layout-cluster)[data-gap="md"] { gap: var(--tendui-space-md); }
:is(.layout-stack, .layout-cluster)[data-gap="lg"] { gap: var(--tendui-space-lg); }
:is(.layout-stack, .layout-cluster)[data-gap="xl"] { gap: var(--tendui-space-xl); }
:is(.layout-stack, .layout-cluster)[data-layout-align="start"] { align-items: flex-start; }
:is(.layout-stack, .layout-cluster)[data-layout-align="center"] { align-items: center; }
:is(.layout-stack, .layout-cluster)[data-layout-align="end"] { align-items: flex-end; }
:is(.layout-stack, .layout-cluster)[data-layout-align="stretch"] { align-items: stretch; }
.layout-cluster[data-layout-align="baseline"] { align-items: baseline; }
.layout-cluster[data-layout-justify="start"] { justify-content: flex-start; }
.layout-cluster[data-layout-justify="center"] { justify-content: center; }
.layout-cluster[data-layout-justify="end"] { justify-content: flex-end; }
.layout-cluster[data-layout-justify="between"] { justify-content: space-between; }

/* Reading content is opt-in. Embedded widgets can opt out of prose descendants.
   ch measures glyph width; this is a readable bound, not an exact character count. */
.prose { inline-size: 100%; max-inline-size: var(--tendui-prose-standard); min-inline-size: 0; }
.prose[data-measure="narrow"] { max-inline-size: var(--tendui-prose-narrow); }
.prose[data-measure="standard"] { max-inline-size: var(--tendui-prose-standard); }
.prose[data-measure="wide"] { max-inline-size: var(--tendui-prose-wide); }
.prose :where(p, li, dd, blockquote):not(:where([data-prose="off"], [data-prose="off"] *)) {
  line-height: var(--tendui-prose-leading);
  overflow-wrap: anywhere;
}
.prose :where(p, ul, ol, dl, blockquote, pre, figure, table):not(:where([data-prose="off"], [data-prose="off"] *)) {
  margin-block: 0 var(--tendui-prose-space);
}
.prose :where(h1, h2, h3, h4, h5, h6):not(:where([data-prose="off"], [data-prose="off"] *)) {
  margin-block: var(--tendui-prose-heading-gap) .75rem;
  overflow-wrap: anywhere;
}
.prose :where(h4):not(:where([data-prose="off"], [data-prose="off"] *)) { font-size: 1.125rem; }
.prose :where(h5, h6):not(:where([data-prose="off"], [data-prose="off"] *)) { font-size: 1rem; }
.prose :where(ul, ol):not(:where([data-prose="off"], [data-prose="off"] *)) { padding-inline-start: 1.5em; }
.prose :where(li + li):not(:where([data-prose="off"], [data-prose="off"] *)) { margin-block-start: .4rem; }
.prose :where(li > ul, li > ol):not(:where([data-prose="off"], [data-prose="off"] *)) { margin-block: .4rem 0; }
.prose :where(dt):not(:where([data-prose="off"], [data-prose="off"] *)) { font-weight: 650; }
.prose :where(dd):not(:where([data-prose="off"], [data-prose="off"] *)) { margin-inline-start: 1.5em; }
.prose :where(dd + dt):not(:where([data-prose="off"], [data-prose="off"] *)) { margin-block-start: .75rem; }
.prose :where(figcaption):not(:where([data-prose="off"], [data-prose="off"] *)) { margin-block-start: .5rem; color: var(--tendui-muted); font-size: .9em; }
.prose :where(code):not(:where([data-prose="off"], [data-prose="off"] *)) { overflow-wrap: anywhere; }
.prose :where(pre):not(:where([data-prose="off"], [data-prose="off"] *)) { max-inline-size: 100%; line-height: 1.5; tab-size: 4; }
.prose :where(pre code):not(:where([data-prose="off"], [data-prose="off"] *)) { font-size: inherit; background: transparent; overflow-wrap: normal; }
.prose :where(blockquote > :last-child):not(:where([data-prose="off"], [data-prose="off"] *)) { margin-block-end: 0; }
.prose > :first-child { margin-block-start: 0; }
.prose > :last-child { margin-block-end: 0; }

/* Print is a separate, opaque palette. Important tokens intentionally override
   more-specific dark selectors and ordinary exported appearance overrides.
   Do not require background-graphics printing to keep text or controls visible. */
@media print {
  :root {
    color-scheme: light !important;
    --tendui-background: #ffffff !important;
    --tendui-surface: #ffffff !important;
    --tendui-subtle: #ffffff !important;
    --tendui-text: #000000 !important;
    --tendui-muted: #333333 !important;
    --tendui-border: #666666 !important;
    --tendui-primary: #333333 !important;
    --tendui-primary-hover: #000000 !important;
    --tendui-on-primary: #ffffff !important;
    --tendui-danger: #333333 !important;
    --tendui-info: #333333 !important;
    --tendui-success: #333333 !important;
    --tendui-warning: #333333 !important;
    --tendui-focus: #333333 !important;
    --tendui-shadow: none !important;
  }
  *, *::before, *::after { animation: none !important; transition: none !important; translate: none !important; }
  article { box-shadow: none; break-inside: avoid; }
  h1, h2, h3, h4, h5, h6 { break-after: avoid; }
  article[data-surface="gradient"] { background: none; border-color: currentColor; }
  .app-shell { display: block; min-block-size: 0; }
  .app-sidebar, .skip-link, .theme-toggle, .tendui-dialog, .tendui-popover, .pagination { display: none; }
  .table-scroll { overflow: visible; }
  .tabs [aria-disabled="true"] { display: none; }
  button, .button, input:is([type="submit"], [type="button"], [type="reset"]) {
    background: transparent !important;
    color: var(--tendui-text) !important;
    border-color: var(--tendui-border) !important;
  }
  .steps [aria-current="step"] .step-number {
    background: transparent;
    color: var(--tendui-text);
    border-color: var(--tendui-border);
    border-width: 2px;
  }
  input[type="checkbox"][role="switch"] { appearance: auto; inline-size: 1.2rem; block-size: 1.2rem; }
  input[role="switch"]::before { content: none; }
}

/* SiteHeader: one sticky bar. Menus are native disclosures; no script. */
.site-header { --site-rule: color-mix(in srgb, var(--tendui-border) 35%, transparent); position: sticky; inset-block-start: 0; z-index: 20; background: var(--tendui-background); border-block-end: 1px solid var(--site-rule); }
@supports (backdrop-filter: blur(1px)) { .site-header { background: color-mix(in srgb, var(--tendui-background) 86%, transparent); backdrop-filter: blur(12px); } }
.app-shell > .site-header { grid-column: 1 / -1; }
body > .site-header { inline-size: auto; margin-inline: 0; padding-block: 0; border-block-end-color: var(--site-rule); }
.site-header-inner { display: flex; align-items: center; gap: 2.5rem; block-size: 4rem; max-inline-size: 90rem; margin-inline: auto; padding-inline: clamp(1rem, 3vw, 2rem); }
.site-header ul { margin: 0; padding: 0; list-style: none; }
.site-header details { margin: 0; padding: 0; border: 0; }
.site-header details[open] > summary { margin: 0; }
.site-header summary { list-style: none; font-weight: 500; }
.site-header summary::-webkit-details-marker { display: none; }
.site-header :is(a, summary, button):focus-visible { outline: 2px solid var(--tendui-focus); outline-offset: 2px; }
.site-brand { display: inline-flex; align-items: center; gap: .625rem; flex: none; color: var(--tendui-text); font-size: 1.125rem; font-weight: 700; letter-spacing: -.03em; text-decoration: none; }
.site-brand > img, .site-brand > svg { display: block; inline-size: 2rem; block-size: 2rem; }
.site-nav { display: flex; flex-wrap: nowrap; justify-content: flex-start; align-items: center; gap: .25rem; }
.site-nav > a, .site-menu > summary { position: relative; display: inline-flex; align-items: center; gap: .375rem; block-size: 2.25rem; padding-inline: .75rem; border-radius: .5rem; color: var(--tendui-muted); font-size: .875rem; text-decoration: none; white-space: nowrap; }
.site-nav > a:hover, .site-menu > summary:hover, .site-menu[open] > summary { background: var(--tendui-subtle); color: var(--tendui-text); }
.site-nav > a[aria-current="page"], .site-menu > summary[data-current] { color: var(--tendui-text); }
.site-nav > a[aria-current="page"]::after, .site-menu > summary[data-current]::after { content: ""; position: absolute; inset-inline: .75rem; inset-block-end: calc(-.875rem - 1px); block-size: 2px; border-radius: 2px; background: var(--tendui-primary); }
.site-header summary .tendui-icon { transition: transform var(--tendui-duration-fast) var(--tendui-ease-out); }
.site-header details[open] > summary .tendui-icon { transform: rotate(180deg); }
.site-menu { position: relative; }
.site-menu-panel { position: absolute; inset-block-start: calc(100% + .375rem); inset-inline-start: -.5rem; z-index: 1; display: grid; gap: 1rem; inline-size: 41.25rem; padding: 1.25rem; background: var(--tendui-surface); border: 1px solid var(--site-rule); border-radius: .875rem; box-shadow: var(--tendui-shadow); }
.site-menu-groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr)); gap: 1rem; }
.site-menu-groups ul { display: grid; gap: .125rem; }
.site-sheet-list { display: block; }
.site-header nav a[aria-current="page"] { font-weight: 600; }
.site-menu-title { margin: 0 0 .375rem .5rem; color: var(--tendui-muted); font-size: .6875rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
.site-menu-groups a { display: block; padding: .5rem; border-radius: .5rem; color: var(--tendui-text); font-size: .875rem; text-decoration: none; }
.site-menu-groups a:hover, .site-menu-groups a[aria-current="page"] { background: var(--tendui-subtle); }
.site-menu-footer { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: .5rem 1rem; padding: .75rem .5rem 0; border-block-start: 1px solid var(--site-rule); font-size: .8125rem; }
.site-menu-footer p { margin: 0; color: var(--tendui-muted); }
.site-menu-footer a { color: var(--tendui-primary); font-weight: 600; text-decoration: none; }
.site-actions { display: flex; align-items: center; gap: .5rem; margin-inline-start: auto; }
.site-extras { display: flex; align-items: center; gap: .5rem; }
.site-extras a, .site-sheet-footer a { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; block-size: 2.25rem; padding-inline: .75rem; border: 1px solid var(--site-rule); border-radius: .5rem; color: var(--tendui-text); font-size: .875rem; font-weight: 500; text-decoration: none; }
.site-extras a:hover, .site-sheet-footer a:hover { background: var(--tendui-subtle); }
.site-header .theme-toggle button { display: inline-flex; align-items: center; justify-content: center; gap: .375rem; min-block-size: 2.25rem; padding-block: 0; border-color: var(--site-rule); color: var(--tendui-muted); }
.site-header .theme-toggle button:hover { color: var(--tendui-text); }
.theme-toggle-icon { display: inline-flex; }
.theme-toggle[data-icon-only] button { inline-size: 2.25rem; padding-inline: 0; }
.theme-toggle-icon[data-mode="dark"], :root[data-theme="dark"] .theme-toggle-icon[data-mode="light"] { display: none; }
:root[data-theme="dark"] .theme-toggle-icon[data-mode="dark"] { display: inline-flex; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) .theme-toggle-icon[data-mode="light"] { display: none; }
  :root:not([data-theme="light"]):not([data-theme="dark"]) .theme-toggle-icon[data-mode="dark"] { display: inline-flex; }
}
.site-sheet { display: none; }
.site-sheet > summary { display: inline-flex; align-items: center; justify-content: center; inline-size: 2.75rem; block-size: 2.75rem; border-radius: .625rem; color: var(--tendui-text); }
.site-sheet[open] > summary { background: var(--tendui-subtle); }
.site-sheet-close, .site-sheet[open] .site-sheet-open { display: none; }
.site-sheet[open] .site-sheet-close { display: inline-flex; }
.site-sheet-panel { position: absolute; inset-inline: 0; inset-block-start: 100%; display: flex; flex-direction: column; flex-wrap: nowrap; align-items: stretch; justify-content: flex-start; gap: 0; max-block-size: calc(100dvh - 3.75rem); overflow-y: auto; padding: .75rem .75rem 1.25rem; background: var(--tendui-surface); border-block-end: 1px solid var(--site-rule); box-shadow: var(--tendui-shadow); }
.site-sheet-list > li > a, .site-sheet-group > summary { display: flex; align-items: center; justify-content: space-between; min-block-size: 3rem; padding-inline: .75rem; border-radius: .625rem; color: var(--tendui-text); font-size: 1.0625rem; text-decoration: none; }
.site-sheet-list > li > a[aria-current="page"] { background: var(--tendui-subtle); font-weight: 600; }
.site-sheet-section ul, .site-sheet-group ul { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 .5rem; margin: .375rem 0 .625rem .75rem; padding-inline-start: .75rem; border-inline-start: 1px solid var(--site-rule); }
.site-sheet-section a, .site-sheet-group ul a, .site-sheet-all { display: flex; align-items: center; min-block-size: 2.5rem; color: var(--tendui-muted); font-size: .9375rem; text-decoration: none; }
.site-sheet-section a[aria-current="page"], .site-sheet-group ul a[aria-current="page"], .site-sheet-all { color: var(--tendui-primary); font-weight: 600; }
.site-sheet-all { margin-inline-start: 1.5rem; }
.site-sheet-footer { display: grid; margin-block-start: 1rem; padding-block-start: 1rem; border-block-start: 1px solid var(--site-rule); }
.site-sheet-footer a { block-size: 3rem; }
@media (max-width: 64rem) {
  .site-header-inner { position: relative; }
  .site-menu { position: static; }
  .site-menu-panel { inset-inline: clamp(1rem, 3vw, 2rem); inline-size: auto; }
}
@media (max-width: 48rem) {
  .site-header-inner { gap: .25rem; block-size: 3.75rem; padding-inline: 1rem .5rem; }
  .site-brand { margin-inline-end: auto; }
  .site-brand > img, .site-brand > svg { inline-size: 1.875rem; block-size: 1.875rem; }
  .site-nav, .site-extras { display: none; }
  .site-actions { margin-inline-start: 0; }
  .site-sheet { display: block; }
  .site-header .theme-toggle[data-icon-only] button { inline-size: 2.75rem; min-block-size: 2.75rem; border-color: transparent; }
}
@media (forced-colors: active) {
  .site-nav > a[aria-current="page"]::after, .site-menu > summary[data-current]::after { background: CanvasText; }
  .site-menu-panel, .site-sheet-panel { border: 1px solid CanvasText; }
}
@media print { .site-header { display: none; } }