/* Site chrome: header, mobile menu, footer. */

/* ---------- Header ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: var(--header-h);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-header-bg);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 100%;
}

.nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
}

.brand__mark {
  width: 24px;
  height: auto;
  aspect-ratio: 757 / 679;
  color: var(--color-text);
  transition: color var(--duration-normal) var(--ease-out-expo);
}

.brand:hover .brand__mark {
  color: var(--color-accent);
}

.nav__list {
  display: flex;
  align-items: center;
}

.nav__item + .nav__item {
  border-left: 1px solid var(--color-line-strong);
}

.nav__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.875rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--color-text-muted);
  transition: color var(--duration-fast) linear;
}

.nav__link::before {
  content: "";
  width: 4px;
  height: 4px;
  background: var(--color-text);
  transition: background-color var(--duration-fast) linear;
}

.nav__link:hover,
.nav__link[aria-current="true"] {
  color: var(--color-text);
}

.nav__link:hover::before,
.nav__link[aria-current="true"]::before {
  background: var(--color-accent);
}

/* ---------- Language switch ---------- */

.lang {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-mono);
}

.lang a {
  color: var(--color-text-dim);
  transition: color var(--duration-fast) linear;
}

.lang a:hover {
  color: var(--color-text);
}

.lang a[aria-current="true"] {
  color: var(--color-text);
}

.lang__sep {
  color: var(--color-line-strong);
}

.mobile-menu .lang {
  margin: 0 0 1.5rem;
  font-size: var(--text-sm);
}

/* ---------- Appearance toggles ---------- */

.appearance {
  display: flex;
}

.appearance__btn {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--color-line-strong);
  color: var(--color-text-muted);
  transition:
    color var(--duration-fast) linear,
    border-color var(--duration-fast) linear,
    background-color var(--duration-fast) linear;
}

.appearance__btn + .appearance__btn {
  border-left: 0;
}

.appearance__btn:hover {
  color: var(--color-text);
  background: var(--color-surface-raised);
}

.appearance__btn svg {
  width: 14px;
  height: 14px;
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.appearance__btn[aria-pressed="true"] svg {
  transform: rotate(180deg);
}

.swatch {
  display: flex;
  gap: 2px;
}

.swatch i {
  width: 4px;
  height: 10px;
  transition: background-color var(--duration-normal) linear;
}

.swatch i:nth-child(1) {
  background: var(--color-accent);
}

.swatch i:nth-child(2) {
  background: var(--color-cyan);
}

.swatch i:nth-child(3) {
  background: var(--color-magenta);
}

[data-ascii-mode="mono"] .swatch i:nth-child(1) {
  background: var(--color-text-dim);
}

[data-ascii-mode="mono"] .swatch i:nth-child(2) {
  background: var(--color-text);
}

[data-ascii-mode="mono"] .swatch i:nth-child(3) {
  background: var(--color-text-muted);
}

.menu-toggle {
  display: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-mono);
  padding: 0.5rem 0;
}

.mobile-menu {
  position: fixed;
  inset: var(--header-h) 0 0;
  z-index: 49;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 2rem var(--gutter) 2.5rem;
  background: var(--color-bg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition:
    opacity var(--duration-normal) var(--ease-out-expo),
    transform var(--duration-normal) var(--ease-out-expo),
    visibility 0s linear var(--duration-normal);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition-delay: 0s;
}

.mobile-menu__list li {
  border-bottom: 1px solid var(--color-line);
}

.mobile-menu__list a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 1.125rem 0;
  font-size: var(--text-xl);
  letter-spacing: var(--tracking-tight);
  line-height: 1.1;
}

.mobile-menu__list .index {
  font-size: var(--text-xs);
}

@media (max-width: 960px) {
  .nav,
  .site-header__cta,
  .site-header .lang {
    display: none;
  }

  .appearance {
    margin-left: auto;
  }

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

/* ---------- Footer ---------- */

.site-footer {
  position: relative;
  border-top: 1px solid var(--color-line);
  padding-top: clamp(3rem, 2rem + 4vw, 6rem);
  overflow: hidden;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 2.5rem;
  padding-bottom: clamp(3rem, 2rem + 4vw, 5rem);
}

.footer-grid__intro p {
  max-width: 22rem;
  margin-top: 1.25rem;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.footer-col h2 {
  margin-bottom: 1.125rem;
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 400;
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--color-text-dim);
}

.footer-col li + li {
  margin-top: 0.625rem;
}

.footer-col a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--duration-fast) linear;
}

.footer-col a:hover {
  color: var(--color-accent);
}

.wordmark {
  display: block;
  width: 100%;
  padding-inline: var(--gutter);
  font-size: 12px;
  line-height: 1;
  color: transparent;
  background: linear-gradient(
      100deg,
      var(--wordmark-base) 0%,
      var(--wordmark-base) 30%,
      var(--wordmark-1) 42%,
      var(--wordmark-2) 48%,
      var(--wordmark-3) 54%,
      var(--wordmark-base) 66%,
      var(--wordmark-base) 100%
    )
    0 0 / 300% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  animation: wordmark-sweep 9s linear infinite;
}

@keyframes wordmark-sweep {
  from {
    background-position: 100% 0;
  }
  to {
    background-position: -50% 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .wordmark {
    animation: none;
    background-position: 50% 0;
  }
}

.footer-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-block: 1.5rem;
  border-top: 1px solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--color-text-dim);
}

.footer-bar__social {
  display: flex;
  gap: 1.5rem;
}

.footer-bar__social a:hover {
  color: var(--color-text);
}

@media (max-width: 960px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid__intro {
    grid-column: 1 / -1;
  }
}