/*
 * Teachometry visual system
 *
 * This layer is loaded before page composition styles on the redesigned public
 * surfaces. It owns the shared chrome, outer shell, common controls, and brand
 * tokens; page CSS remains responsible for each surface's composition and
 * semantic accents.
 */
:root {
  --teach-bg-light: #f8faf7;
  --teach-surface-light: #ffffff;
  --teach-surface-muted-light: #eaf3ef;
  --teach-ink-light: #123a5b;
  --teach-muted-light: #536d80;
  --teach-line-light: #d9e6e2;
  --teach-line-strong-light: #a7c4bd;
  --teach-accent-light: #086965;
  --teach-accent-strong-light: #07524f;
  --teach-accent-soft-light: #e1f2eb;

  --teach-bg-dark: #102421;
  --teach-surface-dark: #18322e;
  --teach-surface-muted-dark: #213d38;
  --teach-ink-dark: #eff7f0;
  --teach-muted-dark: #b7ccc6;
  --teach-line-dark: #35544c;
  --teach-line-strong-dark: #5b8075;
  --teach-accent-dark: #afe0cf;
  --teach-accent-strong-dark: #d0f1e5;
  --teach-accent-soft-dark: #254a40;

  --teach-serif: Georgia, "Times New Roman", serif;
  --teach-sans: Arial, "Segoe UI", sans-serif;
  --teach-mono: ui-monospace, SFMono-Regular, Consolas, monospace;
  --teach-focus: #0b7770;

  --teach-shell-standard: 1280px;
  --teach-shell-wide: 1360px;
  --teach-shell-editorial: 1280px;
  --teach-shell-reading: 1180px;
  --teach-shell-chrome: 1280px;
  --teach-gutter-desktop: 80px;
  --teach-gutter-tablet: 32px;
  --teach-gutter-mobile: 18px;
  --teach-header-height: 88px;
  --teach-wordmark-mark: 28px;
  --teach-wordmark-size: 29px;
  --teach-control-size: 29px;
  --teach-icon-size: 18px;
  --teach-button-height: 40px;
  --teach-button-radius: 5px;
  --teach-locale-control-width: 112px;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) {
  --bg: var(--teach-bg-light);
  --surface: var(--teach-surface-light);
  --surface-muted: var(--teach-surface-muted-light);
  --ink: var(--teach-ink-light);
  --muted: var(--teach-muted-light);
  --line: var(--teach-line-light);
  --line-strong: var(--teach-line-strong-light);
  --accent: var(--teach-accent-light);
  --accent-strong: var(--teach-accent-strong-light);
  --accent-soft: var(--teach-accent-soft-light);
  --serif: var(--teach-serif);
  font-family: var(--teach-sans);
  background: var(--bg);
  color: var(--ink);
  color-scheme: light;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
)[data-theme="dark"] {
  --bg: var(--teach-bg-dark);
  --surface: var(--teach-surface-dark);
  --surface-muted: var(--teach-surface-muted-dark);
  --ink: var(--teach-ink-dark);
  --muted: var(--teach-muted-dark);
  --line: var(--teach-line-dark);
  --line-strong: var(--teach-line-strong-dark);
  --accent: var(--teach-accent-dark);
  --accent-strong: var(--teach-accent-strong-dark);
  --accent-soft: var(--teach-accent-soft-dark);
  color-scheme: dark;
}

body.home-page {
  --shell: var(--teach-shell-standard);
}

body.methodology-page {
  --shell: var(--teach-shell-standard);
}

body.results-page,
body.cases-page,
body.case-detail-page {
  --shell: var(--teach-shell-wide);
}

body.about-page {
  --about-shell: var(--teach-shell-editorial);
}

body.blog-page {
  --blog-shell: var(--teach-shell-editorial);
}

body.blog-article-page {
  --article-shell: var(--teach-shell-editorial);
}

/* Case detail keeps its red public-boundary and subject accents, but shares
 * the same brand surfaces and ink as the rest of Teachometry. */
body.case-detail-page {
  --case-bg: var(--teach-bg-light);
  --case-surface: var(--teach-surface-light);
  --case-surface-muted: var(--teach-surface-muted-light);
  --case-ink: var(--teach-ink-light);
  --case-muted: var(--teach-muted-light);
  --case-line: var(--teach-line-light);
  --case-line-strong: var(--teach-line-strong-light);
  --case-accent: var(--teach-accent-light);
  --case-accent-strong: var(--teach-accent-strong-light);
  --case-accent-soft: var(--teach-accent-soft-light);
  --case-serif: var(--teach-serif);
  --case-shell: var(--teach-shell-wide);
}

body.case-detail-page[data-theme="dark"] {
  --case-bg: var(--teach-bg-dark);
  --case-surface: var(--teach-surface-dark);
  --case-surface-muted: var(--teach-surface-muted-dark);
  --case-ink: var(--teach-ink-dark);
  --case-muted: var(--teach-muted-dark);
  --case-line: var(--teach-line-dark);
  --case-line-strong: var(--teach-line-strong-dark);
  --case-accent: var(--teach-accent-dark);
  --case-accent-strong: var(--teach-accent-strong-dark);
  --case-accent-soft: var(--teach-accent-soft-dark);
}

/* The common header is deliberately independent of page content width. */
body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header {
  z-index: 10;
  min-height: var(--teach-header-height);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 72%, transparent);
  background: color-mix(in srgb, var(--bg) 95%, transparent);
  backdrop-filter: blur(12px);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .header-inner {
  width: min(calc(100% - (var(--teach-gutter-desktop) * 2)), var(--teach-shell-chrome));
  max-width: var(--teach-shell-chrome);
  min-height: var(--teach-header-height);
  height: var(--teach-header-height);
  gap: 24px;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .wordmark {
  flex-shrink: 0;
  align-items: center;
  gap: 10px;
  color: var(--accent);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .wordmark-mark {
  width: var(--teach-wordmark-mark);
  height: var(--teach-wordmark-mark);
  margin-top: 0;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .wordmark-name {
  color: var(--accent);
  font: var(--teach-wordmark-size)/1.1 var(--teach-serif);
  letter-spacing: -0.05em;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .wordmark-descriptor {
  margin-top: 5px;
  color: var(--muted);
  text-transform: uppercase;
  font: 600 7px/1.6 var(--teach-mono);
  letter-spacing: 0.16em;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .nav-links {
  display: flex;
  position: static;
  flex: 1;
  width: auto;
  align-items: center;
  justify-content: center;
  gap: clamp(16px, 2.2vw, 32px);
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: 12px/1.55 var(--teach-sans);
  font-weight: 400;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .nav-links a {
  padding: 4px 0;
  color: var(--muted);
  text-decoration: none;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .nav-links a:hover,
body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .nav-links a[aria-current="page"] {
  color: var(--ink);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .nav-links a[aria-current="page"] {
  font-weight: inherit;
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 7px;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header-tools {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 16px;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .theme-controls {
  display: inline-flex;
  height: var(--teach-button-height);
  box-sizing: border-box;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  box-shadow: none;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .theme-controls button {
  display: inline-flex;
  width: var(--teach-control-size);
  height: var(--teach-control-size);
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 50%;
  padding: 4px;
  background: transparent;
  color: var(--accent);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .theme-controls button[aria-pressed="true"] {
  background: var(--accent-soft);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .theme-controls .site-icon,
body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .github-link .site-icon {
  width: var(--teach-icon-size);
  height: var(--teach-icon-size);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .github-link {
  display: inline-flex;
  width: var(--teach-button-height);
  height: var(--teach-button-height);
  box-sizing: border-box;
  align-items: center;
  justify-content: center;
  margin: 0;
  color: var(--ink);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .home-header-tools .github-link {
  display: inline-flex;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header-tools > .button-primary {
  flex: 0 0 auto;
  width: auto;
  min-width: 123px;
  white-space: nowrap;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .button-primary {
  min-height: var(--teach-button-height);
  border: 1px solid var(--accent);
  border-radius: var(--teach-button-radius);
  padding: 9px 16px;
  background: var(--accent);
  color: #ffffff;
  font: 12px/1.4 var(--teach-sans);
  gap: 10px;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .button-primary:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: #ffffff;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .home-header .button-primary .site-icon {
  width: var(--teach-icon-size);
  height: var(--teach-icon-size);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
)[data-theme="dark"] .home-header .button-primary,
body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
)[data-theme="dark"] .home-header .button-primary:hover {
  border-color: var(--accent);
  background: var(--accent);
  color: #0b342f;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .locale-switcher {
  position: relative;
  flex: 0 0 auto;
  color: var(--ink);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .locale-switcher::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 14px;
  width: 7px;
  height: 7px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  pointer-events: none;
  transform: translateY(-65%) rotate(45deg);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .locale-switcher select {
  appearance: none;
  -webkit-appearance: none;
  width: var(--teach-locale-control-width);
  min-width: var(--teach-locale-control-width);
  max-width: var(--teach-locale-control-width);
  height: var(--teach-button-height);
  min-height: var(--teach-button-height);
  box-sizing: border-box;
  padding: 0 38px 0 12px;
  border: 1px solid var(--line);
  border-radius: var(--teach-button-radius);
  background: var(--surface);
  color: var(--ink);
  font: 12px/1.4 var(--teach-sans);
}

@media (forced-colors: active) {
  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .locale-switcher::after {
    display: none;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .locale-switcher select {
    appearance: auto;
    -webkit-appearance: auto;
    padding-right: 12px;
  }
}

/* Shared semantic layers and control geometry. */
body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .eyebrow {
  color: var(--accent);
  font: 600 10px/1.6 var(--teach-mono);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

:where(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .site-icon {
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  overflow: visible;
  vertical-align: middle;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) .site-icon > * {
  vector-effect: non-scaling-stroke;
}

/* These pages intentionally keep the approved compact 19px content-icon
 * baseline; the variant lives here so page sheets do not repeat the primitive. */
:is(
  .methodology-page,
  .cases-page,
  .about-page
) .site-icon {
  width: 19px;
  height: 19px;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) main .button {
  min-height: 42px;
  border-radius: var(--teach-button-radius);
  padding: 10px 16px;
  font: 13px/1.4 var(--teach-sans);
  gap: 10px;
  white-space: nowrap;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) main .button-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #ffffff;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) main .button-primary:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: #ffffff;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
)[data-theme="dark"] main .button-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #0b342f;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) main .button .site-icon {
  width: var(--teach-icon-size);
  height: var(--teach-icon-size);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page
) :focus-visible {
  outline: 2px solid var(--teach-focus);
  outline-offset: 4px;
}

/* Keep the content shell wide enough for each composition while giving all
 * routes the same viewport edge rhythm. Reading prose remains narrow inside
 * the article layout; only its outer editorial shell is shared. */
body.home-page main .shell,
body.methodology-page main .shell,
body.about-page main .shell,
body.blog-page main .shell {
  width: min(calc(100% - (var(--teach-gutter-desktop) * 2)), var(--teach-shell-editorial));
  max-width: var(--teach-shell-editorial);
}

body.results-page main .shell,
body.cases-page main .shell,
body.case-detail-page main .shell {
  width: min(calc(100% - (var(--teach-gutter-desktop) * 2)), var(--teach-shell-wide));
  max-width: var(--teach-shell-wide);
}

@media (min-width: 1024px) {
  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .header-inner {
    position: relative;
    display: flex;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .nav-links {
    position: absolute;
    left: 50%;
    width: clamp(500px, 36vw, 580px);
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    column-gap: 26px;
    transform: translateX(-50%);
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .nav-group {
    display: flex;
    align-items: center;
    gap: 24px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .nav-group-left {
    justify-content: flex-end;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .nav-group-right {
    justify-content: flex-start;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .nav-center {
    justify-self: center;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header-tools {
    margin-left: auto;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .home-footer-main {
    position: relative;
    display: block;
    min-height: 118px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .footer-nav-band {
    position: absolute;
    top: 0;
    left: 50%;
    width: clamp(470px, 38vw, 580px);
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    transform: translateX(-50%);
  }
}

@media (max-width: 1100px) and (min-width: 1024px) {
  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
  .run-page,
  .docs-page
  ) .home-header .header-inner {
    width: calc(100% - (var(--teach-gutter-tablet) * 2));
    max-width: none;
    gap: 16px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .nav-links {
    width: 470px;
    min-width: 0;
    column-gap: 20px;
    font-size: 11px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .nav-group {
    gap: 18px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
  .run-page,
  .docs-page
  ) .home-header-tools {
    gap: 12px;
  }

}

@media (max-width: 1100px) and (min-width: 901px) {
  .methodology-page .method-hero,
  .methodology-page .method-scope-not-measure {
    overflow: clip;
  }
}

@media (width < 1024px) {
  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header {
    min-height: 0;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
  .run-page,
  .docs-page
  ) .home-header .header-inner {
    width: calc(100% - (var(--teach-gutter-mobile) * 2));
    max-width: none;
    min-height: 0;
    height: auto;
    flex-wrap: wrap;
    gap: 10px 12px;
    padding: 10px 0;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
  .run-page,
  .docs-page
  ) .home-header .wordmark-name {
    font-size: 26px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
  .run-page,
  .docs-page
  ) .home-header .wordmark-descriptor {
    font-size: 6px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
  .run-page,
  .docs-page
  ) .home-header .nav-toggle {
    display: inline-flex;
    min-width: 60px;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    margin-left: auto;
    border: 1px solid var(--line-strong);
    border-radius: var(--teach-button-radius);
    padding: 8px 12px;
    background: var(--surface);
    color: var(--ink);
    font: 12px/1.4 var(--teach-sans);
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .nav-group {
    display: contents;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .nav-links {
    display: none;
    flex: 0 0 100%;
    order: 3;
    justify-content: flex-start;
    gap: 4px 16px;
    padding: 10px 0 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
  .run-page,
  .docs-page
  ) .home-header .nav-links[data-open="true"] {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: stretch;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .nav-links a {
    display: flex;
    min-width: 0;
    min-height: 44px;
    align-items: center;
    padding: 8px 6px;
    border-bottom: 1px solid var(--line);
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .nav-links a[aria-current="page"] {
    text-underline-offset: 4px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
  .run-page,
  .docs-page
  ) .home-header-tools {
    display: none;
    width: 100%;
    flex: 0 0 100%;
    order: 4;
    justify-content: space-between;
    gap: 12px;
    margin: 0;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .nav-links[data-open="true"] ~ .home-header-tools {
    display: flex;
    align-items: center;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header-tools .locale-switcher select {
    min-height: 44px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .theme-controls {
    height: 48px;
    padding: 3px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .theme-controls button {
    width: 40px;
    height: 40px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header-tools > .github-link {
    width: 44px;
    height: 44px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header-tools > .button-primary {
    min-height: 44px;
  }
}

@media (max-width: 900px) {
  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) main .shell {
    width: calc(100% - (var(--teach-gutter-mobile) * 2));
    max-width: none;
  }
}

@media (max-width: 640px) {
  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .home-header-tools {
    display: none;
    grid-template-columns: minmax(0, 1fr) auto 44px;
    align-items: center;
    gap: 10px;
    padding-top: 12px;
    border-top: 1px solid var(--line);
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header .nav-links[data-open="true"] ~ .home-header-tools {
    display: grid;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header-tools > .locale-switcher {
    min-width: 0;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header-tools > .locale-switcher select {
    width: 100%;
    min-width: 0;
    max-width: 100%;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page
  ) .home-header-tools > .button-primary {
    grid-column: 1 / -1;
    width: 100%;
    min-width: 0;
    justify-content: center;
  }
}


/* Shared chrome motion: subtle feedback, no layout-shifting animation. */
@media (prefers-reduced-motion: no-preference) {
  .home-header,
  .home-header .nav-links a,
  .home-header .locale-switcher select,
  .home-header .theme-controls,
  .home-header .theme-controls button,
  .home-header .github-link,
  .home-header .button-primary {
    transition:
      color 160ms ease,
      background-color 160ms ease,
      border-color 160ms ease,
      opacity 160ms ease,
      transform 160ms ease,
      box-shadow 160ms ease;
  }

  .home-header .nav-links a:hover,
  .home-header .github-link:hover,
  .home-header .theme-controls button:hover {
    transform: translateY(-1px);
  }

  .home-header .nav-links a[aria-current="page"] {
    text-decoration-color: transparent;
    position: relative;
  }

  .home-header .nav-links a[aria-current="page"]::after {
    content: "";
    position: absolute;
    right: 0;
    bottom: -4px;
    left: 0;
    height: 1px;
    background: var(--accent);
    transform-origin: left center;
    animation: teach-nav-indicator 180ms ease-out both;
  }

}

@keyframes teach-nav-indicator {
  from { opacity: 0; transform: scaleX(.35); }
  to { opacity: 1; transform: scaleX(1); }
}

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

/* Canonical public footer.
 * The fixed header owns primary navigation and action controls. The footer is
 * an independent information architecture: shared shell edges, four stable
 * content columns, no duplicated primary nav and no competing CTA. */
body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer {
  display: block;
  padding: 42px 0 22px;
  border-top: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  font: 11px/1.55 var(--teach-sans);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer .shell {
  width: min(calc(100% - (var(--teach-gutter-desktop) * 2)), var(--teach-shell-chrome));
  max-width: var(--teach-shell-chrome);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  min-height: 0;
  padding-bottom: 34px;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer-identity {
  display: grid;
  align-content: start;
  justify-items: start;
  gap: 7px;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .footer-nav-band {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: start;
  gap: clamp(18px, 2.4vw, 34px);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font: 25px/1.2 var(--teach-serif);
  letter-spacing: -0.045em;
  text-decoration: none;
  white-space: nowrap;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer-brand img {
  width: 26px;
  height: 26px;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .footer-descriptor {
  max-width: 220px;
  margin: 0;
  padding: 0;
  color: var(--muted);
  font: 10px/1.45 var(--teach-sans);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer nav.footer-column {
  display: grid;
  align-content: start;
  justify-items: center;
  gap: 10px;
  margin: 0;
  text-align: center;
  font: 12px/1.5 var(--teach-sans);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer .footer-column-title {
  margin-bottom: 5px;
  color: var(--ink);
  font: 600 10px/1.5 var(--teach-mono);
  letter-spacing: .15em;
  text-transform: uppercase;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer nav.footer-column a,
body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer-bottom a {
  color: var(--muted);
  text-decoration: none;
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer nav.footer-column a:hover,
body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer-bottom a:hover {
  color: var(--ink);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer-bottom {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 34px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font: 10px/1.55 var(--teach-sans);
}

body:is(
  .home-page,
  .methodology-page,
  .results-page,
  .cases-page,
  .case-detail-page,
  .about-page,
  .blog-page,
  .models-page,
  .model-detail-page,
  .run-page,
  .docs-page,
  .contact-page
) .home-footer-bottom > span {
  margin-right: auto;
}

@media (max-width: 1023px) {
  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .footer-nav-band {
    position: static;
    width: auto;
    transform: none;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .home-footer .shell {
    width: calc(100% - (var(--teach-gutter-mobile) * 2));
    max-width: none;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .home-footer-main {
    grid-template-columns: minmax(220px, .8fr) minmax(0, 1.2fr);
    gap: 24px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .footer-nav-band {
    grid-column: 2;
    gap: 20px;
  }
}

@media (max-width: 760px) {
  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .home-footer-main {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .home-footer-identity,
  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .footer-nav-band {
    grid-column: 1;
  }
}

@media (max-width: 480px) {
  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .home-footer {
    padding-top: 34px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .home-footer-main {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .home-footer-identity {
    grid-column: auto;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .footer-nav-band {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .home-footer nav.footer-column {
    justify-items: start;
    text-align: left;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .home-footer-bottom {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  body:is(
    .home-page,
    .methodology-page,
    .results-page,
    .cases-page,
    .case-detail-page,
    .about-page,
    .blog-page,
    .models-page,
    .model-detail-page,
    .run-page,
    .docs-page,
    .contact-page
  ) .home-footer-bottom > span {
    margin-right: 0;
  }
}