/* Layout: header, nav, menu sheet, views, page heads, sections, footer strip. */

/* ---------- Header ---------- */
.site-header {
  position: absolute;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--header-h);
  padding-left: var(--edge-l);
  padding-right: var(--edge-r);
  padding-top: env(safe-area-inset-top, 0px);
  box-sizing: content-box;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  view-transition-name: site-header;
}
html.is-home .site-header { position: fixed; }

.site-header__logo {
  position: relative;
  display: block;
  flex: none;
  /* The round badge needs the height to read in the bar (AUTO legible). */
  height: clamp(40px, 1.5rem + 2vw, 56px);
  border-radius: var(--radius-xs);
}
.site-header__logo img {
  height: 100%;
  width: auto;
  transition: opacity var(--motion-duration-base) var(--ease-out);
}
/* Hover: a glint crosses the letters, masked by the mark itself (the same
   file as everything else, so it follows a swap). */
.site-header__logo::after,
.footer__mark::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(104deg, rgb(255 255 255 / 0) 40%, rgb(255 255 255 / 0.8) 50%, rgb(255 255 255 / 0) 60%) no-repeat;
  background-size: 260% 100%;
  background-position: 130% 0;
  -webkit-mask: url("../assets/mark/mark.svg") center / contain no-repeat;
  mask: url("../assets/mark/mark.svg") center / contain no-repeat;
  opacity: 0;
}
@media (hover: hover) {
  .site-header__logo:hover::after,
  .footer__mark:hover::after { animation: logo-glint 900ms var(--motion-ease-in-out) both; }
}
@keyframes logo-glint {
  0% { background-position: 130% 0; opacity: 1; }
  100% { background-position: -30% 0; opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .site-header__logo::after, .footer__mark::after { display: none; }
}
html.stage-unparked .site-header__logo::after { display: none; }

/* On Home the big mark is the logo. The header slot stays as the park target. */
html.stage-unparked .site-header__logo img { opacity: 0; }
html.logo-handoff .site-header__logo img { opacity: 1; }
html.is-home .site-header__logo { pointer-events: none; }

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-4), 2vw, var(--space-6));
  margin: 0 var(--space-5) 0 0;
  padding: 0;
  list-style: none;
}
.site-nav__link {
  position: relative;
  display: inline-flex;
  transition: color var(--hover) var(--ease-out);
  align-items: center;
  min-height: var(--size-touch-min);
  color: var(--color-text);
  text-decoration: none;
  font-stretch: 125%;
  font-weight: 700;
  font-size: var(--type-label-size);
  letter-spacing: var(--type-label-tracking);
  text-transform: uppercase;
  white-space: nowrap;
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: var(--type-label-tracking);
  bottom: 9px;
  height: var(--border-strong);
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--hover) var(--ease-out);
}
.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); transform-origin: left; }
/* The other links step back while one is pointed at. */
@media (hover: hover) {
  .site-nav__list:has(.site-nav__link:hover) .site-nav__link:not(:hover) { color: rgb(var(--gist-cream-rgb) / 0.6); }
}

.menu-toggle {
  display: none;
  align-items: center;
  gap: 0.6em;
  min-height: 40px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-control);
  font-stretch: 125%;
  font-weight: 700;
  font-size: var(--type-label-size);
  letter-spacing: var(--type-label-tracking);
  text-transform: uppercase;
}
.menu-toggle__bars {
  position: relative;
  width: 18px;
  height: 10px;
}
.menu-toggle__bars::before,
.menu-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: var(--border-strong);
  background: currentColor;
  transition: transform var(--motion-duration-base) var(--ease-out), top var(--motion-duration-base) var(--ease-out), right 240ms var(--ease-out);
}
.menu-toggle__bars::before { top: 0; }
.menu-toggle__bars::after { top: 8px; }
@media (hover: hover) {
  .menu-toggle[aria-expanded="false"]:hover .menu-toggle__bars::after { right: 6px; }
}
.menu-toggle[aria-expanded="true"] .menu-toggle__bars::before { top: 4px; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars::after { top: 4px; transform: rotate(-45deg); }

@media (max-width: 899px) {
  .site-nav__list { display: none; }
  .menu-toggle { display: inline-flex; }
  .site-nav__cta { padding: 0 var(--space-3); }
}

/* ---------- Menu sheet (phones and small tablets) ---------- */
/* Opens with the site's wipe, right to left (640 ms), the links pushing in
   behind it 70 ms apart. Closes back to the right, a little quicker. */
.menu-sheet {
  position: fixed;
  inset: 0;
  z-index: 45;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: calc(var(--header-h) + env(safe-area-inset-top, 0px) + var(--space-6)) var(--gutter-r) calc(var(--space-7) + env(safe-area-inset-bottom, 0px)) var(--gutter-l);
  background: var(--gist-ink);
  clip-path: inset(0 0 0 100%);
  visibility: hidden;
  transition: clip-path 440ms var(--motion-ease-in-out), visibility 0s linear 440ms;
}
.menu-sheet.is-open {
  clip-path: inset(0 0 0 0);
  visibility: visible;
  transition: clip-path 640ms var(--vt-ease), visibility 0s;
}
.menu-sheet__list {
  margin: 0 0 var(--space-7);
  padding: 0;
  list-style: none;
  border-top: var(--border-hairline) solid var(--color-line);
}
.menu-sheet__list li { border-bottom: var(--border-hairline) solid var(--color-line); }
.menu-sheet__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  color: var(--color-text);
  text-decoration: none;
  font-size: clamp(1.75rem, 1.2rem + 3vw, 2.75rem);
  font-stretch: 125%;
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1;
  transform: translateX(32px);
  opacity: 0;
  transition: transform 640ms var(--ease-expo), opacity 480ms var(--ease-out), color var(--hover) var(--ease-out);
}
.menu-sheet__link svg { width: 22px; height: 22px; color: var(--color-text-muted); transition: transform var(--hover) var(--ease-out), color var(--hover) var(--ease-out); }
.menu-sheet__link:hover svg, .menu-sheet__link[aria-current="page"] svg { color: var(--color-accent); transform: translateX(4px); }
.menu-sheet.is-open .menu-sheet__link { transform: none; opacity: 1; transition-delay: 80ms; }
.menu-sheet.is-open li:nth-child(2) .menu-sheet__link { transition-delay: 150ms; }
.menu-sheet.is-open li:nth-child(3) .menu-sheet__link { transition-delay: 220ms; }
.menu-sheet.is-open li:nth-child(4) .menu-sheet__link { transition-delay: 290ms; }
.menu-sheet__foot { transition: opacity 480ms var(--ease-out), transform 640ms var(--ease-expo); opacity: 0; transform: translateX(32px); }
.menu-sheet.is-open .menu-sheet__foot { opacity: 1; transform: none; transition-delay: 360ms; }
.menu-sheet__foot { display: grid; gap: var(--space-5); }
.menu-sheet__foot .btn { width: 100%; }
@media (min-width: 900px) { .menu-sheet { display: none; } }

html.menu-open, html.menu-open body { overflow: hidden; }

/* ---------- Views ---------- */
main { position: relative; z-index: 1; display: block; outline: none; }
.view { display: block; }
.view--scroll {
  min-height: 100vh;
  min-height: 100dvh;
  padding-top: calc(var(--header-h) + env(safe-area-inset-top, 0px));
}

/* Page head shared by every scrolling view. */
.page-head {
  padding-top: clamp(var(--space-7), 2rem + 5vw, 10rem);
  padding-bottom: var(--space-block);
}
.page-head__title { margin-top: var(--space-5); max-width: 16ch; }
.page-head__lead { margin-top: var(--space-6); color: var(--color-text); }
.page-head__lead + .page-head__lead { margin-top: var(--space-4); }

.section { padding-block: var(--space-section); }
.section--tight { padding-block: var(--space-block); }
.section + .section { border-top: var(--border-hairline) solid var(--color-line); }
.section__label { margin-bottom: var(--space-5); }
.section__title { max-width: 20ch; }
.section__title + * { margin-top: var(--space-6); }

/* Two-column split used across views. */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-7) var(--space-8);
}
@media (min-width: 960px) {
  .split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
  .split--even { grid-template-columns: 1fr 1fr; }
}

/* Bullet list with hairline markers. */
.ticks { list-style: none; margin: 0; padding: 0; border-top: var(--border-hairline) solid var(--color-line); }
.ticks li {
  position: relative;
  padding: var(--space-4) 0 var(--space-4) calc(18px + var(--space-4));
  border-bottom: var(--border-hairline) solid var(--color-line);
  text-wrap: pretty;
}
.ticks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(var(--space-4) + 0.8em);
  width: 18px;
  height: var(--border-strong);
  background: var(--color-line-strong);
}

/* ---------- Footer strip ---------- */
.footer {
  margin-top: var(--space-block);
  border-top: var(--border-hairline) solid var(--color-line);
  padding-top: var(--space-block);
  padding-bottom: calc(var(--space-6) + env(safe-area-inset-bottom, 0px));
}
.footer__grid {
  display: grid;
  gap: var(--space-7) var(--space-6);
}
/* Sized for the round badge, so it signs off the page without taking it over. */
.footer__mark { position: relative; display: block; width: clamp(104px, 5.5rem + 3vw, 144px); }
.footer__mark img { width: 100%; height: auto; }
.footer__about { margin-top: var(--space-5); max-width: 38ch; color: var(--color-text-muted); }
.footer__links { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-1); }
.footer__links a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  color: var(--color-text);
  text-decoration: none;
  font-stretch: 125%;
  font-weight: 700;
  font-size: var(--type-label-size);
  letter-spacing: var(--type-label-tracking);
  text-transform: uppercase;
  background: linear-gradient(var(--color-accent), var(--color-accent)) calc(100% - var(--type-label-tracking)) calc(100% - 6px) / 0 var(--border-strong) no-repeat;
  transition: background-size var(--hover) var(--ease-out);
}
.footer__links a:hover { background-size: calc(100% - var(--type-label-tracking)) var(--border-strong); background-position: 0 calc(100% - 6px); }
.footer__head { margin-bottom: var(--space-4); color: var(--color-text-muted); }
.footer__base {
  margin-top: var(--space-block);
  padding-top: var(--space-5);
  border-top: var(--border-hairline) solid var(--color-line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4) var(--space-6);
  color: var(--color-text-muted);
}
.footer__legal { display: grid; gap: var(--space-2); max-width: 70ch; }
.back-to-top { color: var(--color-text); }
.back-to-top svg { transform: rotate(-90deg); }
.back-to-top:hover svg { transform: rotate(-90deg) translateX(3px); }

@media (min-width: 760px) {
  .footer__grid { grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr) minmax(0, 1fr); }
}