:root {
  --site-header-height: 6rem;
  --site-footer-content-gap: 0.75rem;
  --site-footer-height: 7.5rem;
  --site-footer-meta-gap: 0.75rem;
  --site-footer-nav-font-size: var(--text-sm);
  --site-footer-nav-gap: 1.25rem;
  --site-footer-social-gap-lg: 10px;
  --site-footer-social-gap-sm: 3px;
  --site-logo-height: 50px;
  --site-brand-gap: 0.75rem;
  --site-brand-name-size: clamp(0.9375rem, 1.1vw, 1.5rem);
  --site-brand-tagline-size: clamp(0.625rem, 0.85vw, 0.6875rem);
  --site-nav-gap: 1.5rem;
  --site-nav-font-size: 1.125rem;
}

/* Breakpoints: desktop ≥1200px, tablet 768–1199px, mobile ≤767px */

/* ── Container ───────────────────────────────────────────── */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-inline: var(--space-page-x);
}

@media (min-width: 768px) and (max-width: 1439px) {
  :root {
    --space-page-x: clamp(1.5rem, 4vw, 3rem);
  }
}

@media (min-width: 1440px) {
  :root {
    --space-page-x: 5rem;
  }

  .container {
    box-sizing: content-box;
    width: auto;
    max-width: var(--container-max);
  }
}

/* ── Site Header ─────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  overflow-x: clip;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.site-header__bar {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--site-nav-gap);
  height: var(--site-header-height);
  min-width: 0;
}

.site-header__actions {
  --site-header-action-icon-size: 1.125rem;
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 0.75rem;
}

.site-header__github-link {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  text-decoration: none;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.site-header__github-link .site-social-icon {
  width: var(--site-header-action-icon-size);
  height: var(--site-header-action-icon-size);
}

.site-header__github-link:hover {
  color: var(--color-text-muted);
  text-decoration: none;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  color: var(--color-text);
  cursor: pointer;
  background: none;
  border: none;
  transition: color var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--color-text-muted);
}

.theme-toggle--header {
  display: none;
}

.theme-toggle__icon {
  display: block;
  width: var(--site-header-action-icon-size, 1.125rem);
  height: var(--site-header-action-icon-size, 1.125rem);
}

.theme-toggle__icon--sun {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle__icon--sun {
    display: block;
  }

  :root:not([data-theme="light"]) .theme-toggle__icon--moon {
    display: none;
  }
}

:root[data-theme="dark"] .theme-toggle__icon--sun {
  display: block;
}

:root[data-theme="dark"] .theme-toggle__icon--moon {
  display: none;
}

.site-header__github-link:focus-visible {
  outline: 2px solid var(--color-border-strong);
  outline-offset: 2px;
  text-decoration: none;
}

.site-nav__inner {
  min-width: 0;
}

.site-brand {
  position: relative;
  z-index: 1;
  display: inline-flex;
  flex: 0 1 auto;
  align-items: center;
  gap: var(--site-brand-gap);
  min-width: 0;
  max-width: 100%;
  line-height: var(--line-height-tight);
  text-decoration: none;
  color: inherit;
  transition: opacity var(--transition-fast);
}

.site-brand:hover {
  opacity: 0.75;
  text-decoration: none;
}

.site-brand:focus-visible {
  outline: 2px solid var(--color-border-strong);
  outline-offset: 3px;
}

.site-brand__logo {
  display: block;
  flex-shrink: 0;
  width: auto;
  height: var(--site-logo-height);
  max-width: 100%;
  border-radius: 9999px;
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.125rem;
  min-width: 0;
}

.site-brand__name {
  font-size: var(--site-brand-name-size);
  font-weight: var(--font-weight-extrabold);
  line-height: 1.1;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-brand__tagline {
  font-size: var(--site-brand-tagline-size);
  font-weight: var(--font-weight-regular);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Site Nav ────────────────────────────────────────────── */

.site-nav {
  flex-shrink: 1;
  min-width: 0;
}

.site-nav__list {
  list-style: none;
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: var(--site-nav-gap);
  margin: 0;
  padding: 0;
}

.site-nav__item {
  display: flex;
  align-items: center;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0;
  font-family: inherit;
  font-size: var(--site-nav-font-size);
  font-weight: var(--font-weight-medium);
  line-height: 1.2;
  letter-spacing: normal;
  text-transform: none;
  text-decoration: none;
  color: var(--color-text);
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.site-nav__link:hover {
  color: var(--color-text-muted);
  text-decoration: none;
}

.site-nav__link:focus-visible {
  outline: 2px solid var(--color-border-strong);
  outline-offset: 3px;
  text-decoration: none;
}

.site-nav__item--github {
  margin-left: 0.5rem;
}

.site-nav__item--theme {
  margin-left: 0.5rem;
}

.site-nav__link--github {
  gap: 0.75rem;
}

.site-social-icon {
  display: block;
  width: 1.375rem;
  height: 1.375rem;
  flex-shrink: 0;
}

.site-nav__github-label {
  display: none;
}

.site-nav__item--dropdown {
  position: relative;
}

.site-nav__dropdown-toggle {
  margin: 0;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
  appearance: none;
  touch-action: auto;
  text-align: inherit;
  gap: 0.4em;
}

.site-nav__dropdown-toggle::after {
  content: "";
  flex-shrink: 0;
  width: 0;
  height: 0;
  border-top: 0.35em solid currentColor;
  border-right: 0.3em solid transparent;
  border-left: 0.3em solid transparent;
  transition: transform var(--transition-fast);
}

.site-nav__item--dropdown.is-open .site-nav__dropdown-toggle::after {
  transform: rotate(180deg);
}

.site-nav__dropdown {
  position: absolute;
  top: calc(100% + 0.375rem);
  left: 0;
  z-index: 110;
  min-width: 13rem;
  max-width: min(13rem, calc(100vw - 2 * var(--space-page-x)));
  margin: 0;
  padding: 0.375rem 0;
  list-style: none;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 24px rgba(26, 26, 26, 0.08);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(0.25rem);
  transition:
    opacity var(--transition-fast),
    visibility var(--transition-fast),
    transform var(--transition-fast);
}

@media (min-width: 768px) {
  .site-menu-toggle {
    display: none;
  }

  .site-nav {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
  }

  .site-nav__inner {
    display: flex;
    justify-content: flex-end;
    width: 100%;
    pointer-events: none;
  }

  .site-nav__list {
    pointer-events: auto;
  }

  .site-nav__item--dropdown {
    align-self: center;
  }

  .site-nav__item--dropdown:hover .site-nav__dropdown-toggle::after,
  .site-nav__item--dropdown:focus-within .site-nav__dropdown-toggle::after {
    transform: rotate(180deg);
  }

  .site-nav__dropdown::before {
    content: "";
    position: absolute;
    top: -0.375rem;
    left: 0;
    right: 0;
    height: 0.375rem;
  }

  .site-nav__item--dropdown:hover .site-nav__dropdown,
  .site-nav__item--dropdown:focus-within .site-nav__dropdown,
  .site-nav__item--dropdown.is-open .site-nav__dropdown {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }
}

.site-nav__dropdown-link {
  display: block;
  padding: 0.625rem 1rem;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1.3;
  letter-spacing: normal;
  text-transform: none;
  text-decoration: none;
  color: var(--color-text);
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.site-nav__dropdown-link:hover {
  color: var(--color-text-muted);
  background-color: var(--color-bg-soft);
  text-decoration: none;
}

.site-nav__dropdown-link:focus-visible {
  outline: 2px solid var(--color-border-strong);
  outline-offset: -2px;
  text-decoration: none;
}

/* ── Mobile menu toggle ────────────────────────────────────── */

.site-menu-toggle {
  display: none;
  flex-shrink: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  min-width: 2.75rem;
  min-height: 2.75rem;
  margin: 0;
  padding: 0;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  touch-action: auto;
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast);
}

.site-menu-toggle:hover {
  border-color: var(--color-border);
  background-color: var(--color-surface);
}

.site-menu-toggle:focus-visible {
  outline: 2px solid var(--color-border-strong);
  outline-offset: 2px;
}

.site-menu-toggle__bar {
  display: block;
  width: var(--site-header-action-icon-size);
  height: 1px;
  background-color: var(--color-text);
  transition: background-color var(--transition-fast);
}

/* ── Main ────────────────────────────────────────────────── */

.main {
  min-height: calc(
    100svh - var(--site-header-height) - var(--site-footer-height)
  );
}

/* ── Site Footer ─────────────────────────────────────────── */

.site-footer {
  overflow-x: clip;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg);
}

.site-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  min-width: 0;
  min-height: var(--site-footer-height);
  padding-block: clamp(2rem, 4vw, 2.75rem);
}

.site-footer__brand {
  min-width: 0;
}

.site-footer .site-brand,
.site-footer .site-brand__tagline {
  transition: color var(--transition-fast);
}

.site-footer .site-brand:hover {
  opacity: 1;
  color: var(--color-brand-deep);
}

.site-footer .site-brand:hover .site-brand__tagline {
  color: var(--color-brand-deep);
}

.site-footer__content {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--site-footer-content-gap);
  min-width: 0;
}

.site-footer__nav {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0;
  min-width: 0;
}

.site-footer__nav-groups {
  list-style: none;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--site-footer-nav-gap);
  margin: 0;
  padding: 0;
}

.site-footer__nav-groups li {
  display: inline-flex;
}

.site-footer__nav-link {
  display: inline-flex;
  align-items: center;
  min-height: auto;
  font-size: var(--site-footer-nav-font-size);
  font-weight: var(--font-weight-medium);
  line-height: 1.2;
  letter-spacing: normal;
  text-transform: none;
  text-decoration: none;
  color: var(--color-text);
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.site-footer__nav-link:hover {
  color: var(--color-text-muted);
  text-decoration: none;
}

.site-footer__nav-link:focus-visible {
  outline: 2px solid var(--color-border-strong);
  outline-offset: 3px;
  text-decoration: none;
}

.site-footer__meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: flex-start;
  gap: var(--site-footer-meta-gap);
  min-width: 0;
}

.site-footer__socials {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0;
}

.site-footer__social-link + .site-footer__social-link {
  margin-left: var(--site-footer-social-gap-lg);
}

.site-footer__social-link
  + .site-footer__social-link
  + .site-footer__social-link {
  margin-left: var(--site-footer-social-gap-sm);
}

.site-footer__social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  text-decoration: none;
  color: var(--color-text);
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.site-footer__social-link:hover {
  color: var(--color-link-hover);
  background-color: var(--color-surface-muted);
  text-decoration: none;
}

.site-footer__social-link:focus-visible {
  outline: 2px solid var(--color-border-strong);
  outline-offset: 2px;
  color: var(--color-text);
  text-decoration: none;
}

.site-footer__copyright {
  margin: 0;
  font-size: var(--text-xs);
  line-height: 1.3;
  color: var(--color-text-muted);
  text-align: right;
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  .site-footer .site-brand,
  .site-footer .site-brand__tagline,
  .site-footer__nav-link,
  .site-footer__social-link {
    transition: none;
  }
}

/* ── Responsive ──────────────────────────────────────────── */

@media (max-width: 1199px) {
  :root {
    --site-footer-nav-gap: 1rem;
    --site-footer-nav-font-size: clamp(0.8125rem, 1.4vw, 0.875rem);
  }
}

/* Tablet: 768px–1199px */
@media (min-width: 768px) and (max-width: 1199px) {
  :root {
    --site-header-height: clamp(5.5rem, 9vw, 6rem);
    --site-nav-gap: 1.25rem;
    --site-nav-font-size: clamp(1rem, 1.6vw, 1.125rem);
  }

  .site-nav__list {
    gap: var(--site-nav-gap);
  }

  .site-header__bar {
    gap: var(--site-nav-gap);
  }
}

@media (min-width: 768px) and (max-width: 991px) {
  :root {
    --site-nav-gap: 1rem;
    --site-nav-font-size: 1rem;
  }
}

@media (max-width: 767px) {
  :root {
    --site-footer-height: auto;
    --site-footer-mobile-gap: 1.25rem;
    --site-footer-nav-touch-min: 2.75rem;
    --site-footer-social-gap-mobile: 1.25rem;
    --site-header-height: 5.5rem;
    --site-brand-gap: 0.625rem;
    --site-brand-name-size: clamp(0.75rem, 3.4vw, 0.875rem);
    --site-brand-tagline-size: clamp(0.5625rem, 2.6vw, 0.6875rem);
    --space-page-x: 1.5rem;
    --site-nav-font-size: 1.0625rem;
  }

  .site-menu-toggle {
    display: flex;
  }

  .site-brand {
    flex: 1 1 auto;
    min-width: 0;
    padding-right: 0.5rem;
  }

  .site-brand__logo {
    height: 44px;
  }

  .site-nav {
    display: none;
    width: 100%;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    overflow-x: clip;
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav__inner {
    padding-block: 0.5rem 1.5rem;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
    width: 100%;
    padding: 0;
    margin: 0;
  }

  .site-nav__item {
    width: 100%;
  }

  .site-nav__link {
    width: 100%;
    min-height: 2.75rem;
    padding: 0.75rem 0;
    font-size: var(--site-nav-font-size);
    font-weight: var(--font-weight-medium);
    letter-spacing: normal;
    text-transform: none;
  }

  .site-nav__dropdown-toggle {
    padding: 0.75rem 0;
  }

  /* Mobile: GitHub and theme toggle in header actions; desktop: in nav (base styles) */
  .site-header__github-link {
    display: inline-flex;
  }

  .site-nav__item--github {
    display: none;
  }

  .theme-toggle--header {
    display: flex;
  }

  .site-nav__item--theme {
    display: none;
  }

  .site-social-icon {
    width: 1.25rem;
    height: 1.25rem;
  }

  .site-nav__item--dropdown {
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav__dropdown {
    position: static;
    display: none;
    min-width: 0;
    width: 100%;
    max-width: none;
    margin: 0;
    padding: 0.25rem 0 0.375rem 1rem;
    background-color: transparent;
    border: none;
    border-radius: 0;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .site-nav__item--dropdown.is-open .site-nav__dropdown {
    display: block;
  }

  .site-nav__dropdown-link {
    min-height: 2.5rem;
    padding: 0.5rem 0;
    font-size: var(--text-sm);
    letter-spacing: normal;
    text-transform: none;
  }

  .site-nav__dropdown-link:hover {
    background-color: transparent;
  }

  .main {
    min-height: auto;
  }

  .site-footer__inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: auto;
    padding-block: 1.5rem;
    gap: var(--site-footer-mobile-gap);
    text-align: center;
  }

  .site-footer__brand {
    width: 100%;
    max-width: 100%;
  }

  .site-footer .site-brand {
    flex: 0 1 auto;
    flex-direction: column;
    align-items: center;
    align-self: center;
    padding-right: 0;
    text-align: center;
  }

  .site-footer .site-brand__text {
    align-items: center;
  }

  .site-footer .site-brand__name {
    font-size: clamp(1.25rem, 6vw, 1.5rem);
  }

  .site-footer .site-brand__tagline {
    font-size: clamp(0.6875rem, 3vw, 0.8125rem);
  }

  .site-footer__content {
    align-items: center;
    width: 100%;
  }

  .site-footer__nav {
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    max-width: 100%;
  }

  .site-footer__nav-groups {
    flex-direction: column;
    align-items: center;
    gap: 0;
    width: 100%;
    max-width: 100%;
  }

  .site-footer__nav-groups li {
    justify-content: center;
    width: 100%;
  }

  .site-footer__nav-link {
    justify-content: center;
    width: 100%;
    min-height: var(--site-footer-nav-touch-min);
    padding-block: 0.75rem;
    font-size: var(--site-nav-font-size);
  }

  .site-footer__meta {
    align-items: center;
    gap: var(--site-footer-meta-gap);
    width: 100%;
    max-width: 100%;
  }

  .site-footer__socials {
    flex-wrap: nowrap;
    justify-content: center;
    gap: var(--site-footer-social-gap-mobile);
  }

  .site-footer__social-link {
    width: var(--site-footer-nav-touch-min);
    height: var(--site-footer-nav-touch-min);
  }

  .site-footer__social-link + .site-footer__social-link,
  .site-footer__social-link
    + .site-footer__social-link
    + .site-footer__social-link {
    margin-left: 0;
  }

  .site-footer__copyright {
    width: 100%;
    white-space: normal;
    text-align: center;
  }
}

@media (max-width: 479px) {
  :root {
    --space-page-x: 1.25rem;
  }

  .site-footer__inner {
    padding-block: 1rem;
    gap: var(--site-footer-mobile-gap);
  }
}

/* ── Banded pages ────────────────────────────────────────── */

/* Shared page pattern (home, blog, ...): brand-colored header without
   a divider, light band sections and a light footer continuing the
   last band. A page opts in via body_class "banded". */

body.banded {
  --home-band-bg: #e6eaf0;
  --home-band-bg-strong: #dbeafe;
  --home-band-title-color: #203472;
}

body.banded .site-header {
  background-color: var(--color-brand);
  border-bottom: 0;
}

body.banded .site-header .site-brand__tagline {
  color: var(--color-text);
}

body.banded .site-brand__logo {
  box-shadow: 0 0 0 2px #ffffff;
}

@media (max-width: 767px) {
  body.banded .site-nav {
    background-color: var(--color-brand);
    border-bottom: 0;
  }
}

body.banded .site-footer {
  border-top: 0;
  background-color: var(--home-band-bg);
  color: #1a1a1a;
}

body.banded .site-footer .site-brand__tagline {
  color: #4b5563;
}

body.banded .site-footer__nav-link {
  color: #1a1a1a;
}

body.banded .site-footer__nav-link:hover {
  color: #4b5563;
}

body.banded .site-footer__social-link {
  color: #1a1a1a;
}

body.banded .site-footer__social-link:hover {
  color: #203472;
  background-color: var(--home-band-bg-strong);
}

body.banded .site-footer__copyright {
  color: #4b5563;
}

/* Light band section: re-theme cards for the light band
   (dark theme is forced site-wide) */

.band-section {
  background-color: var(--home-band-bg);
  --color-bg: #f8fafc;
  --color-bg-soft: #f8fafc;
  --color-surface: #f8fafc;
  --color-surface-muted: #e8f0fe;
  --color-border: #e2e8f0;
  --color-border-strong: #1a1a1a;
  --color-accent: #1a1a1a;
  --color-accent-hover: #333333;
  --color-brand-strong: #203472;
  --color-text: #1a1a1a;
  --color-text-muted: #4b5563;
  --color-text-soft: #64748b;
  --color-link: #1a1a1a;
  --color-link-hover: #404040;
  --placeholder-line: rgba(26, 26, 26, 0.06);
}