/* Video card thumbnail controls: solid tiles flush to the thumbnail edges,
   so they read on any image. Revealed on hover or keyboard focus. */
.video-card-duration { position: absolute; right: 0; bottom: 0; padding: 4px 8px; background: var(--color-text); color: var(--color-text-inverse); font-size: 11px; font-weight: 500; line-height: 1.4; font-variant-numeric: tabular-nums; }
.video-card-play { position: absolute; top: 50%; left: 50%; display: flex; align-items: center; justify-content: center; width: 56px; height: 56px; margin: -28px 0 0 -28px; background: var(--color-accent); color: var(--color-text-inverse); opacity: 0; transition: opacity 150ms linear; }
.video-card-play svg { width: 22px; height: 22px; margin-left: 2px; }
.video-card-actions { position: absolute; top: 12px; right: 12px; z-index: 10; display: flex; opacity: 0; transition: opacity 150ms linear; }
@media (min-width: 768px) { .video-card-actions { top: 16px; right: 16px; } }
.video-card-action { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; background: var(--color-text); color: var(--color-text-inverse); transition: background-color 100ms linear, color 100ms linear; }
.video-card-action + .video-card-action { border-left: 1px solid rgba(255, 255, 255, .2); }
.video-card-action svg { width: 18px; height: 18px; }
.video-card-action[aria-pressed="true"] { color: var(--color-accent); }
.video-card-action:hover { background: var(--color-accent); color: var(--color-text-inverse); }
.video-card-action:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
.group:hover .video-card-play, .group:focus-within .video-card-play,
.group:hover .video-card-actions, .group:focus-within .video-card-actions { opacity: 1; }
@media (hover: none) { .video-card-actions { opacity: 1; } }

/* Option 1 — quiet editorial. Theme and font preferences remain independent. */
:root {
  --site-gutter: clamp(24px, 5.2vw, 100px);
  --site-header-height: 64px;
}

/* Shared page edges: only the video player sits outside this container. */
.site-container { width: 100%; margin-inline: auto; padding-inline: var(--site-gutter); }

.site-header { position: sticky; top: 0; z-index: 40; background: var(--color-bg); }
.site-header-inner { min-height: var(--site-header-height); display: flex; align-items: center; gap: 48px; }
.site-logo { display: inline-flex; align-items: center; flex-shrink: 0; font-family: var(--font-heading); font-size: 32px; font-weight: 600; letter-spacing: -.065em; line-height: 1; }
.site-logo-play { width: 14px; height: 18px; margin-right: 8px; background: var(--color-accent); mask: url("/assets/ui/play-ec296b27.svg") center / contain no-repeat; }
.site-links { display: flex; align-items: center; gap: 32px; }
.site-nav-link { position: relative; font-size: 15px; font-weight: 400; line-height: 1.4; white-space: nowrap; }
.site-nav-link::after { content: ""; position: absolute; left: 0; right: 0; bottom: -7px; height: 1px; background: currentColor; transform: scaleX(0); transform-origin: left; transition: transform .2s ease; }
.site-nav-link:hover::after { transform: scaleX(1); }
.site-header-actions { display: flex; align-items: center; gap: 16px; margin-left: auto; }
.site-icon { display: block; width: 24px; height: 24px; flex-shrink: 0; }
.site-sign-in { display: inline-flex; align-items: center; justify-content: center; min-height: 36px; padding: 0 14px; border: 1px solid var(--color-border-subtle); color: var(--color-text); font-size: 13px; white-space: nowrap; transition: border-color .2s; }
.site-sign-in:hover { border-color: var(--color-text); }
.account-avatar { display: grid; place-items: center; width: 34px; height: 34px; border: 1px solid var(--color-border-subtle); color: var(--color-text); background: var(--color-bg); font-size: 14px; font-weight: 500; text-transform: uppercase; }
.site-header-actions [data-controller="dropdown"] > button { padding: 0; }
/* Desktop search: a full-width band under the header, typed at display size. */
.site-search-disclosure { position: static; }
.site-search-disclosure > summary { display: grid; place-items: center; width: 44px; height: 44px; cursor: pointer; list-style: none; }
.site-search-disclosure > summary::-webkit-details-marker, .site-mobile-menu summary::-webkit-details-marker { display: none; }
.search-close-icon, .site-search-disclosure[open] .search-open-icon { display: none; }
.site-search-disclosure[open] .search-close-icon { display: block; }
.site-search-panel { position: absolute; top: 100%; left: 0; right: 0; padding: clamp(32px, 3.6vw, 56px) 0 clamp(28px, 3vw, 44px); background: var(--color-bg); border-top: 1px solid var(--color-border-subtle); border-bottom: 1px solid var(--color-border-subtle); }
.site-search-panel label { display: block; margin-bottom: 20px; color: var(--color-text-secondary); font-size: 15px; line-height: 1.4; }
.site-search-field { display: flex; align-items: flex-end; gap: 24px; border-bottom: 3px solid var(--color-text); transition: border-color var(--transition-fast); }
.site-search-field:focus-within { border-color: var(--color-accent); }
.site-search-field input { flex: 1; min-width: 0; border: 0; padding: 0 0 .14em; background: transparent; color: var(--color-text); font-family: var(--font-heading); font-size: clamp(44px, 5.6vw, 88px); font-weight: 600; letter-spacing: -.045em; line-height: 1.05; }
.site-search-field input::placeholder { color: color-mix(in srgb, var(--color-text) 30%, var(--color-bg)); opacity: 1; }
.site-search-field input::-webkit-search-cancel-button { appearance: none; }
.site-search-field input:focus { outline: none; box-shadow: none; }
.site-search-field button { display: grid; place-items: center; flex-shrink: 0; width: clamp(56px, 4.6vw, 72px); aspect-ratio: 1; margin-bottom: 14px; background: var(--color-accent); color: var(--color-text-inverse); transition: background-color var(--transition-fast); }
.site-search-field button:hover { background: var(--color-accent-hover); }
.site-search-field button .site-icon { width: 28px; height: 28px; background: currentColor; mask: url("/assets/ui/arrow-right-60c205e5.svg") center / contain no-repeat; }
.site-search-hint { margin: 16px 0 0; color: var(--color-text-muted); font-size: 13px; }
.site-mobile-search > div { display: flex; align-items: center; border-bottom: 1px solid var(--color-border); }
.site-mobile-search input { flex: 1; min-width: 0; border: 0; padding: 12px 0; background: transparent; color: var(--color-text); font: 400 15px var(--font-body); }
.site-mobile-search input:focus { outline: none; box-shadow: none; }
.site-mobile-search > div:focus-within { border-color: var(--color-accent); }
.site-mobile-search button { display: grid; place-items: center; flex-shrink: 0; width: 44px; height: 44px; }
.site-mobile-menu { display: none; }
.site-header :is(a, button, summary):focus-visible, .hero-browse:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 6px; }
.skip-link { position: fixed; left: 20px; top: 10px; z-index: 100; padding: 12px 20px; background: var(--color-text); color: var(--color-bg); transform: translateY(-200%); }
.skip-link:focus { transform: translateY(0); }

/* Videos sets the reference dimensions; directory heroes use a shorter band. */
.discovery-hero {
  --hero-title-size: clamp(80px, 9.9vw, 152px);
  --hero-title-leading: .84;
  --hero-title-band: calc(var(--hero-title-size) * var(--hero-title-leading) * 3);
  --hero-padding-start: clamp(36px, 3.78vw, 58px);
  --hero-padding-end: 48px;
  --hero-gap: clamp(40px, 4.2vw, 64px);
  --hero-stacked-size: 0px;
  position: relative;
  display: grid;
  grid-template-columns: 1.95fr 1fr;
  grid-template-rows: var(--hero-title-band);
  align-items: end;
  gap: var(--hero-gap);
  margin: 0 var(--site-gutter);
  padding: var(--hero-padding-start) 0 var(--hero-padding-end);
  border-bottom: 2px solid var(--color-border);
}
.discovery-hero h1 { margin: 0 0 0 -.045em; font-family: var(--font-heading); font-size: var(--hero-title-size); font-weight: 600; letter-spacing: -.045em; line-height: var(--hero-title-leading); }
.discovery-hero h1 > span { display: block; }
.hero-introduction { align-self: end; padding-bottom: 32px; }
.hero-introduction p { max-width: 440px; margin: 0; font-size: clamp(19px, 1.7vw, 26px); line-height: 1.45; font-weight: 400; color: var(--color-text); }
.hero-browse { display: inline-flex; align-items: center; gap: 20px; min-height: 44px; margin-top: 22px; color: var(--color-accent); font-size: clamp(19px, 1.82vw, 28px); font-weight: 500; line-height: 1.35; }
.hero-browse .site-icon { width: 24px; height: 24px; background: currentColor; mask: url("/assets/ui/arrow-right-60c205e5.svg") center / contain no-repeat; }
.hero-browse:hover .site-icon { transform: translateX(5px); }
.hero-browse .site-icon { transition: transform .2s ease; }

#videos { scroll-margin-top: calc(var(--site-header-height) + 16px); }
#videos:focus { outline: none; }
#videos > div { padding-top: 39px; padding-bottom: 64px; }
#videos > div > header { margin-bottom: 22px; }
#videos > div > header h2 { font-size: clamp(28px, 2.6vw, 40px); font-weight: 600; letter-spacing: -.04em; }
/* Talk grid: the home page cards, shared by every page that lists talks. */
.video-grid.talk-grid { --video-inset: 24px; --video-rule: rgba(0, 0, 0, .06); gap: 0; border-top: 0; }
.talk-grid > .video-grid-item { border-left: 0; border-bottom: 1px solid var(--video-rule); }
.talk-grid article > a:first-child { margin: var(--video-inset) var(--video-inset) 0; }
.talk-grid .video-card-copy { padding-inline: var(--video-inset); }
.talk-grid .video-card-meta { margin-inline: var(--video-inset); }
.talk-grid .video-card-actions { top: var(--video-inset); right: var(--video-inset); }
@media (min-width: 768px) and (max-width: 1023px) {
  .talk-grid > .video-grid-item:nth-child(2n) { border-left: 1px solid var(--video-rule); }
}
@media (min-width: 1024px) {
  .talk-grid > .video-grid-item:nth-child(3n+2), .talk-grid > .video-grid-item:nth-child(3n) { border-left: 1px solid var(--video-rule); }
}
.talk-grid article > a:first-child > div { aspect-ratio: 2.18; }
.talk-grid article .text-theme-accent { color: var(--color-text-secondary); }
.talk-grid .group h3, .talk-grid .group:hover h3 { color: var(--color-text); }
.talk-grid article:hover h3 { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .2em; }
.talk-grid article .border-t { border-color: var(--color-border-subtle); }
.talk-grid .rounded-lg { border-radius: 0; }

@media (max-width: 1099px) {
  .site-header-inner { gap: 40px; }
  .site-links { gap: 28px; }
  .site-header-actions { gap: 18px; }
  .site-nav-link { font-size: 15px; }
  .hero-introduction { padding-bottom: 15px; }
}

@media (max-width: 899px) {
  :root { --site-header-height: 60px; }
  .site-links, .site-search-disclosure { display: none; }
  .site-mobile-menu { display: block; }
  .site-mobile-menu summary { display: grid; place-items: center; width: 44px; height: 44px; cursor: pointer; list-style: none; }
  .menu-close-icon, .site-mobile-menu[open] .menu-open-icon { display: none; }
  .site-mobile-menu[open] .menu-close-icon { display: block; }
  .site-mobile-panel { position: absolute; left: 0; right: 0; top: 100%; padding: 20px var(--site-gutter) 24px; background: var(--color-bg); border-bottom: 1px solid var(--color-border-subtle); max-height: calc(100svh - var(--site-header-height)); overflow-y: auto; }
  .site-mobile-menu[open] .site-mobile-panel { animation: site-enter .2s ease backwards; }
  .site-mobile-eyebrow { padding-bottom: 12px; font-size: 11px; color: var(--color-text-muted); }
  .site-mobile-panel > a { display: block; padding: 12px 0; border-bottom: 1px solid var(--color-border-subtle); font-size: 22px; font-weight: 500; letter-spacing: -.04em; }
  .site-mobile-panel > a[aria-current="page"] { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 6px; }
  .site-mobile-search { margin-top: 20px; }
  .site-mobile-search label { display: block; margin-bottom: 8px; color: var(--color-text-secondary); font-size: 12px; }
  .discovery-hero {
    --hero-title-size: clamp(76px, 11vw, 98px);
    --hero-support-band: 132px;
    --hero-gap: 32px;
    --hero-stacked-size: calc(var(--hero-support-band) + var(--hero-gap));
    grid-template-columns: 1fr;
    grid-template-rows: var(--hero-title-band) var(--hero-support-band);
  }
  .hero-introduction { grid-row: 2; align-self: start; padding-bottom: 0; }
  .hero-introduction p, .hero-browse { font-size: 19px; }
}

@media (max-width: 599px) {
  :root { --site-gutter: 24px; --site-header-height: 56px; }
  .site-logo { font-size: 29px; }
  .site-logo-play { width: 14px; height: 18px; margin-right: 8px; }
  .site-header-actions { gap: 14px; }
  .site-sign-in { min-height: 36px; padding: 0 12px; font-size: 12px; }
  .account-avatar { width: 36px; height: 36px; font-size: 14px; }
  .discovery-hero {
    --hero-title-size: clamp(76px, 20vw, 108px);
    --hero-support-band: 176px;
    --hero-padding-start: 32px;
    --hero-padding-end: 32px;
    --hero-gap: 30px;
  }
  .hero-introduction { max-width: 330px; padding: 0; }
  .hero-introduction p { font-size: 18px; line-height: 1.45; }
  .hero-browse { margin-top: 12px; font-size: 18px; }
  #videos > div { padding-top: 24px; }
  .talk-grid { --video-inset: 20px; }
  .talk-grid article > a:first-child > div { aspect-ratio: 1.75; }
  #videos > div > header h2 { font-size: 26px; }
  footer .grid-cols-12 { grid-template-columns: minmax(0, 1fr); }
  footer .grid-cols-12 > * { grid-column: 1 / -1; min-width: 0; }
  footer .grid-cols-3 { gap: 12px; }
  footer .grid-cols-3 span:last-child { font-size: 9px; letter-spacing: .06em; }
  nav.pagination > span { min-width: 0; height: auto; padding: 0; margin: 0; border: 0; }
  nav.pagination a, nav.pagination > span.current { min-width: 36px; height: 44px; padding: 0 10px; font-size: 10px; }
  nav.pagination .first, nav.pagination .last { display: none; }
  nav.pagination span.gap { padding: 0 6px; }
}

@media (prefers-reduced-motion: reduce) {
  .discovery-hero *, .site-header * { animation: none !important; transition: none !important; }
}