/* 根首頁 IA／NAV：所有新規則限於 hub-home，shared topbar、font control 與 unit-card 維持 main.css 真值。 */
body[data-page="hub-home"] {
  --home-text-display: 3rem;
  --home-text-h4: 1.375rem;
  --home-text-h5: 1.125rem;
  --home-text-body: 1rem;
  --home-text-small: 0.875rem;
  --home-leading-display: 1.18;
  --home-leading-body: 1.5;
}

body[data-page="hub-home"] .topbar--hub {
  flex-wrap: wrap;
  height: auto;
  min-height: var(--topbar-h);
}

body[data-page="hub-home"] .hub-primary-nav {
  min-width: 0;
}

body[data-page="hub-home"] .hub-primary-nav__list,
body[data-page="hub-home"] .hub-intent-nav__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

body[data-page="hub-home"] .hub-primary-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
}

body[data-page="hub-home"] .hub-primary-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: max(2.75rem, var(--control-hit-min));
  padding: var(--space-2) var(--space-3);
  color: hsl(var(--foreground));
  font-size: var(--home-text-small);
  font-weight: 600;
  line-height: var(--home-leading-body);
  overflow-wrap: anywhere;
  text-align: center;
  text-decoration: none;
  -webkit-tap-highlight-color: hsl(var(--ring) / 0.12);
}

body[data-page="hub-home"] .home-hero {
  width: min(100%, var(--content-wide-max));
  margin: 0 auto var(--space-12);
  padding: var(--space-6);
  background: hsl(var(--card));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

body[data-page="hub-home"] .home-hero__copy {
  min-width: 0;
  max-inline-size: var(--content-readable-max);
}

body[data-page="hub-home"] .home-hero__title {
  margin: 0 0 var(--space-3);
  color: hsl(var(--foreground));
  font-size: var(--home-text-display);
  font-weight: 750;
  line-height: var(--home-leading-display);
  overflow-wrap: anywhere;
}

body[data-page="hub-home"] .home-hero__eyebrow,
body[data-page="hub-home"] .unit-card__eyebrow {
  margin: 0 0 var(--space-2);
  color: hsl(var(--muted-foreground));
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: var(--home-leading-body);
  overflow-wrap: anywhere;
}

body[data-page="hub-home"] .home-hero__lead {
  margin: 0;
  color: hsl(var(--muted-foreground));
  font-size: var(--text-lg);
  font-weight: 400;
  line-height: var(--home-leading-body);
  overflow-wrap: anywhere;
}

body[data-page="hub-home"] .hub-intent-nav {
  min-width: 0;
  margin-top: var(--space-6);
}

body[data-page="hub-home"] .hub-intent-nav__title {
  margin: 0 0 var(--space-3);
  color: hsl(var(--foreground));
  font-size: var(--text-h1);
  font-weight: 700;
  line-height: 1.3;
}

body[data-page="hub-home"] .hub-intent-nav__list {
  display: grid;
  gap: var(--space-3);
}

body[data-page="hub-home"] .hub-intent-nav__link {
  display: block;
  min-height: max(4rem, var(--control-hit-min));
  padding: var(--space-3) var(--space-4);
  color: hsl(var(--foreground));
  background: hsl(var(--muted));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow-wrap: anywhere;
  text-decoration: none;
  -webkit-tap-highlight-color: hsl(var(--ring) / 0.12);
}

body[data-page="hub-home"] .hub-intent-nav__label,
body[data-page="hub-home"] .hub-intent-nav__desc {
  display: block;
}

body[data-page="hub-home"] .hub-intent-nav__label {
  color: hsl(var(--foreground));
  font-size: var(--home-text-body);
  font-weight: 700;
  line-height: var(--home-leading-body);
}

body[data-page="hub-home"] .hub-intent-nav__desc {
  margin-top: var(--space-1);
  color: hsl(var(--foreground));
  font-size: var(--home-text-small);
  font-weight: 450;
  line-height: var(--home-leading-body);
}

body[data-page="hub-home"] .home-section__head {
  width: min(100%, var(--content-readable-max));
  margin-left: 0;
  margin-right: auto;
}

body[data-page="hub-home"] .home-section__head h2 {
  margin: 0 0 var(--space-3);
  color: hsl(var(--foreground));
  font-size: var(--text-h1);
  font-weight: 700;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

body[data-page="hub-home"] .home-section__head p {
  margin: 0;
  color: hsl(var(--foreground));
  font-size: var(--home-text-body);
  font-weight: 400;
  line-height: var(--home-leading-body);
  overflow-wrap: anywhere;
}

body[data-page="hub-home"] .home-section[id] {
  scroll-margin-top: calc(var(--topbar-offset) + var(--space-4));
}

body[data-page="hub-home"] #arena-webdev-card {
  scroll-margin-top: calc(var(--topbar-offset) + var(--space-4));
}

body[data-page="hub-home"] .home-grid {
  display: grid;
  width: 100%;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

body[data-page="hub-home"] .home-tool-layout,
body[data-page="hub-home"] .home-resource-groups {
  display: grid;
  gap: var(--space-8);
}

body[data-page="hub-home"] .home-tool-group,
body[data-page="hub-home"] .home-resource-group {
  min-width: 0;
}

body[data-page="hub-home"] .home-tool-group__head,
body[data-page="hub-home"] .home-resource-group > h3 {
  margin: 0 0 var(--space-4);
}

body[data-page="hub-home"] .home-tool-group__head h3,
body[data-page="hub-home"] .home-resource-group > h3 {
  margin: 0;
  color: hsl(var(--foreground));
  font-size: var(--text-h2);
  font-weight: 700;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

body[data-page="hub-home"] .home-tool-group__head p {
  margin: var(--space-1) 0 0;
  color: hsl(var(--muted-foreground));
  font-size: var(--home-text-small);
  font-weight: 450;
  line-height: var(--home-leading-body);
  overflow-wrap: anywhere;
}

body[data-page="hub-home"] .home-setup-link {
  width: min(100%, var(--content-readable-max));
  margin: var(--space-6) 0 0;
}

body[data-page="hub-home"] .home-setup-link a {
  display: inline-block;
  min-height: max(2.75rem, var(--control-hit-min));
  padding: var(--space-2) 0;
  font-size: var(--home-text-small);
  font-weight: 600;
  line-height: var(--home-leading-body);
  overflow-wrap: anywhere;
}

body[data-page="hub-home"] .unit-card {
  min-width: 0;
  -webkit-tap-highlight-color: hsl(var(--ring) / 0.12);
  touch-action: manipulation;
}

body[data-page="hub-home"] .unit-card__title {
  margin: 0 0 var(--space-3);
  color: hsl(var(--foreground));
  font-size: var(--home-text-h4);
  font-weight: 700;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

body[data-page="hub-home"] .unit-card__desc {
  margin: 0 0 var(--space-4);
  color: hsl(var(--foreground));
  font-size: var(--home-text-body);
  font-weight: 400;
  line-height: var(--home-leading-body);
}

body[data-page="hub-home"] .unit-card__cta {
  margin: 0;
  margin-top: auto;
  color: hsl(var(--foreground));
  font-size: var(--home-text-small);
  font-weight: 600;
  line-height: var(--home-leading-body);
}

body[data-page="hub-home"] .unit-card--muted .unit-card__cta {
  color: hsl(var(--muted-foreground));
}

body[data-page="hub-home"] .unit-card__desc,
body[data-page="hub-home"] .unit-card__cta,
body[data-page="hub-home"] .unit-card__cta > span {
  min-width: 0;
  overflow-wrap: anywhere;
}

body[data-page="hub-home"] .unit-card:active,
body[data-page="hub-home"] .hub-primary-nav__link:active,
body[data-page="hub-home"] .hub-intent-nav__link:active {
  transform: none;
}

body[data-page="hub-home"] :is(.hub-primary-nav__link, .hub-intent-nav__link, .unit-card):focus-visible {
  outline: 2px solid hsl(var(--ring));
  outline-offset: 2px;
}

@media (max-width: 767.98px) {
  body[data-page="hub-home"] .topbar--hub {
    padding-right: calc(var(--space-4) + env(safe-area-inset-right));
    padding-left: calc(var(--space-4) + env(safe-area-inset-left));
    column-gap: var(--space-1);
    row-gap: var(--space-2);
  }

  body[data-page="hub-home"] .topbar--hub .topbar__brand {
    display: block;
    flex: 1 1 0;
    overflow: visible;
    text-overflow: clip;
  }

  body[data-page="hub-home"] .topbar--hub .topbar__spacer {
    display: none;
  }

  body[data-page="hub-home"] .hub-primary-nav {
    flex-basis: 100%;
    order: 3;
  }

  body[data-page="hub-home"] .hub-primary-nav__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-1);
  }

  body[data-page="hub-home"] .hub-primary-nav__link {
    justify-content: center;
    min-width: 0;
    padding-right: var(--space-1);
    padding-left: var(--space-1);
  }

  body[data-page="hub-home"] .home {
    padding-right: calc(var(--container-gutter) + env(safe-area-inset-right));
    padding-bottom: calc(var(--space-16) + env(safe-area-inset-bottom));
    padding-left: calc(var(--container-gutter) + env(safe-area-inset-left));
  }
}

@media (min-width: 768px) {
  body[data-page="hub-home"] .hub-primary-nav {
    flex-basis: 100%;
    order: 3;
  }

  body[data-page="hub-home"] .hub-primary-nav__list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-1);
  }

  body[data-page="hub-home"] .hub-primary-nav__link {
    justify-content: center;
    min-width: 0;
  }

  body[data-page="hub-home"] .home-hero {
    padding: var(--space-8);
  }

  body[data-page="hub-home"] .home-grid--tools {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  body[data-page="hub-home"] .home-resource-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  body[data-page="hub-home"] .topbar--hub {
    flex-wrap: nowrap;
  }

  body[data-page="hub-home"] .hub-primary-nav {
    flex-basis: auto;
    order: 0;
  }

  body[data-page="hub-home"] .hub-primary-nav__list {
    display: flex;
  }

  body[data-page="hub-home"] .home-hero {
    display: flex;
    flex-wrap: wrap;
    align-items: start;
    gap: var(--space-8);
    margin-bottom: var(--space-16);
  }

  body[data-page="hub-home"] .home-hero__copy {
    flex: 0 1 var(--content-readable-max);
  }

  body[data-page="hub-home"] .hub-intent-nav {
    flex: 1 1 var(--card-min);
    margin-top: 0;
  }

  body[data-page="hub-home"] .home-tool-layout {
    grid-template-columns: minmax(0, 2fr) minmax(19rem, 1fr);
    align-items: start;
  }

  body[data-page="hub-home"] .home-section + .home-section {
    margin-top: var(--space-16);
  }
}

@media (hover: hover) and (pointer: fine) {
  body[data-page="hub-home"] .hub-primary-nav__link:hover {
    color: hsl(var(--link-hover));
    text-decoration: underline;
  }

  body[data-page="hub-home"] .hub-intent-nav__link:hover,
  body[data-page="hub-home"] .unit-card:hover {
    border-color: hsl(var(--ring));
    box-shadow: var(--shadow-md);
    color: hsl(var(--foreground));
    text-decoration: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html:has(body[data-page="hub-home"]) {
    scroll-behavior: auto;
  }

  body[data-page="hub-home"] :is(.hub-primary-nav__link, .hub-intent-nav__link, .unit-card) {
    transition: none;
  }
}