/* Shared layout for the home-page mockups. Variant files set the tokens. */

:root {
  --max: 1180px;
  --gutter: 20px;
  --radius: 2px;
  --hero-height: 200vh;   /* was 520vh then 300vh; one viewport of scrub, as on the best product pages */
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--ground); color: var(--ink); font: 400 17px/1.55 var(--sans); }
img { display: block; max-width: 100%; }
a { color: inherit; }
h1, h2, h3, p { margin: 0; }

.mono { font-family: var(--mono); font-size: 0.82em; letter-spacing: 0.02em; }
.eyebrow { font: 600 11px/1.3 var(--sans); letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; }
.h2 { font: var(--h2-font); letter-spacing: var(--h2-tracking); }
.display { font: var(--display-font); letter-spacing: var(--display-tracking); max-width: 12em; }
.lede { font-size: clamp(17px, 1.6vw, 21px); line-height: 1.5; max-width: 32em; margin-top: 18px; color: var(--hero-muted); }
.section-head { margin-bottom: 36px; }
.section-lede { max-width: 42em; color: var(--muted); margin-top: 14px; font-size: 18px; }
.more { margin-top: 28px; }
.more a { font-weight: 600; text-decoration: none; border-bottom: 1px solid var(--accent); padding-bottom: 2px; }
.button { display: inline-block; padding: 12px 20px; border: 1px solid var(--ink); border-radius: var(--radius); text-decoration: none; font-weight: 600; }
.button:hover { background: var(--ink); color: var(--ground); }

/* mock bar */
.mock-bar { position: fixed; bottom: 0; left: 0; right: 0; z-index: 50; display: flex; justify-content: space-between; gap: 16px; padding: 8px 14px; font: 12px/1.3 ui-monospace, Menlo, monospace; background: #111; color: #ddd; }
.mock-bar a { color: #fff; margin-left: 10px; }

/* nav */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 40; display: flex; justify-content: space-between; align-items: center; padding: 18px max(var(--gutter), calc((100vw - var(--max)) / 2)); color: var(--nav-ink); background: var(--nav-bg); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }
.wordmark { text-decoration: none; font: var(--wordmark-font); letter-spacing: var(--wordmark-tracking); text-transform: var(--wordmark-case); }
.nav-links a { text-decoration: none; margin-left: 26px; font-size: 15px; font-weight: 500; opacity: 0.9; }
.nav-links a:hover { opacity: 1; color: var(--accent); }
@media (max-width: 760px) {
  .nav { flex-wrap: wrap; padding-top: 12px; padding-bottom: 10px; }
  .nav-links { display: flex; width: 100%; gap: 16px; margin-top: 10px; overflow-x: auto; scrollbar-width: none; }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a { margin-left: 0; white-space: nowrap; font-size: 11px; }
}

/* hero */
.hero { position: relative; height: var(--hero-height); background: #171513; color: #fff; }   /* matches the frames' background */
.hero-sticky { position: sticky; top: 0; height: 100vh; overflow: hidden; }
.hero-canvas, .hero-poster { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero-poster { transition: opacity 0.4s; }
.hero-scrim { position: absolute; inset: 0; background: var(--hero-scrim); pointer-events: none; }
.hero-stops { position: absolute; inset: 0; padding: 0 max(var(--gutter), calc((100vw - var(--max)) / 2)); display: grid; align-items: var(--stop-align); }
.stop { grid-area: 1 / 1; opacity: 0; transform: translateY(12px); transition: opacity 0.5s ease, transform 0.5s ease; max-width: 600px; padding-bottom: 12vh; pointer-events: none; }
.stop.is-active { opacity: 1; transform: none; }
.stop .eyebrow { color: var(--hero-accent); }
.hero-hint { position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%); font: 600 11px/1 var(--sans); letter-spacing: 0.2em; text-transform: uppercase; opacity: 0.6; }
.hero-done .hero-hint { opacity: 0; }
.hero-static { height: auto; }
.hero-static .hero-sticky { position: relative; height: 820px; }
.hero-static .hero-poster { opacity: 1; }
.hero-static .hero-stops { position: absolute; inset: 0; display: block; padding-top: 120px; }
.hero-static .stop { position: static; opacity: 1; transform: none; margin-bottom: 28px; padding-bottom: 0; }
.hero-static .stop .display { font-size: clamp(28px, 3.2vw, 44px); }
.hero-static .stop .lede { display: none; }
.hero-static .hero-hint { display: none; }

/* statement */
.statement { padding: 96px max(var(--gutter), calc((100vw - var(--max)) / 2)) 40px; }
.statement-text { font: var(--statement-font); letter-spacing: -0.01em; max-width: 30em; }
.statement-modeling { color: var(--muted); }
.statement-focus { margin-top: 28px; max-width: 42em; font-size: 19px; line-height: 1.5; color: var(--muted); }
@media (prefers-reduced-motion: reduce) { .loop { display: none; } }

/* generic section padding */
.pillars, .resources, .papers, .news, .join { padding: 72px max(var(--gutter), calc((100vw - var(--max)) / 2)); }

/* pillars */
.pillar-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.pillar { position: relative; display: block; aspect-ratio: 3 / 4; overflow: hidden; border-radius: var(--radius); text-decoration: none; color: #fff; background: #000; }
.pillar img, .pillar video { width: 100%; height: 100%; object-fit: cover; opacity: 0.9; transition: transform 0.6s ease, opacity 0.4s; }
.pillar:hover img, .pillar:hover video { transform: scale(1.04); opacity: 1; }
.pillar-text { position: absolute; left: 0; right: 0; bottom: 0; padding: 18px; background: linear-gradient(to top, rgba(0,0,0,0.78), rgba(0,0,0,0)); }
.pillar-num { font-family: var(--mono); font-size: 12px; opacity: 0.7; }
.pillar h3 { font: var(--h3-font); margin: 4px 0 6px; }
.pillar p { font-size: 14px; line-height: 1.4; opacity: 0.85; }
@media (max-width: 900px) { .pillar-grid { grid-template-columns: repeat(2, 1fr); } }

/* resources */
.resources { background: var(--band); color: var(--band-ink); }
.resources .eyebrow { color: var(--band-accent); }
.resources .section-lede { color: var(--band-muted); }
.resource-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.resource { text-decoration: none; display: block; }
.resource img, .resource video { aspect-ratio: 3 / 2; object-fit: cover; width: 100%; border-radius: var(--radius); display: block; }
.resource h3 { font: var(--h3-font); margin: 14px 0 6px; }
.resource p { font-size: 14.5px; line-height: 1.45; color: var(--band-muted); }
.resource .mono { display: inline-block; margin-top: 8px; color: var(--band-accent); }
.resources .more a { border-color: var(--band-accent); }
@media (max-width: 900px) { .resource-grid { grid-template-columns: repeat(2, 1fr); } }

/* papers */
.paper-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px 32px; }
.paper { display: grid; grid-template-columns: 180px 1fr; gap: 20px; align-items: start; }
.paper-fig img { aspect-ratio: 3 / 2; object-fit: cover; width: 100%; border-radius: var(--radius); background: #000; }
.paper-venue { margin-bottom: 6px; color: var(--accent); }
.paper h3 { font: var(--h3-font); }
.paper h3 a { text-decoration: none; }
.paper h3 a:hover { color: var(--accent); }
.paper-authors { font-size: 14px; color: var(--muted); margin-top: 6px; line-height: 1.4; }
.paper-links { margin-top: 8px; font-size: 13px; }
.paper-links a { margin-right: 12px; text-decoration: none; border-bottom: 1px solid var(--rule); }
.tags { margin-top: 8px; }
.tag { display: inline-block; font: 500 11px/1 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; padding: 4px 7px; border: 1px solid var(--rule); border-radius: 999px; margin-right: 6px; color: var(--muted); }
@media (max-width: 900px) { .paper-grid { grid-template-columns: 1fr; } }
@media (max-width: 560px) { .paper { grid-template-columns: 1fr; } }

/* news */
.news { border-top: 1px solid var(--rule); }
.news-list { list-style: none; padding: 0; margin: 0; }
.news-list li { display: grid; grid-template-columns: 180px 1fr; gap: 20px; padding: 16px 0; border-bottom: 1px solid var(--rule); }
.news-date { color: var(--muted); padding-top: 3px; }
.news-body a { font-weight: 600; text-decoration: none; }
.news-body a:hover { color: var(--accent); }
.news-text { color: var(--muted); }
.news .tag { margin-right: 10px; vertical-align: 2px; }
@media (max-width: 560px) { .news-list li { grid-template-columns: 1fr; gap: 4px; } }

/* join + footer */
.join { background: var(--band); color: var(--band-ink); }
.join .eyebrow { color: var(--band-accent); }
.join .section-lede { color: var(--band-muted); }
.join-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 36px 32px; margin-top: 8px; }
.join-item h3 { font: var(--h3-font); margin-bottom: 8px; }
.join-item p { font-size: 15.5px; line-height: 1.5; color: var(--band-muted); }
.join-links { margin-top: 8px; }
.join-links a { display: inline-block; margin: 0 14px 4px 0; font-size: 14px; font-weight: 600; color: var(--band-ink); text-decoration: none; border-bottom: 1px solid var(--band-accent); }
.join-lookfor ul { margin: 0 0 16px; padding-left: 18px; font-size: 15.5px; line-height: 1.5; color: var(--band-muted); }
.join-lookfor li { margin-bottom: 6px; }
.join .button { border-color: var(--band-ink); color: var(--band-ink); }
.join .button:hover { background: var(--band-ink); color: var(--band); }
.join-meta { margin-top: 14px; font-size: 14px; }
@media (max-width: 900px) { .join-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .join-grid { grid-template-columns: 1fr; } }
.foot { padding: 28px max(var(--gutter), calc((100vw - var(--max)) / 2)) 64px; font-size: 13px; color: var(--muted); border-top: 1px solid var(--rule); }

/* layout hooks: inert unless a variant styles them */
.rail { display: none; }
.section-body { display: contents; }
.statement-body { display: contents; }
.split { display: none; }
.bands { display: block; }

/* research themes: question, short answer, loop, linked papers */
.theme { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; padding: 36px 0; border-top: 1px solid var(--rule); }
.theme:nth-of-type(even) .theme-media { order: 2; }
.theme-media { margin: 0; }
.theme-media video { width: 100%; height: auto; display: block; border-radius: var(--radius); background: #000; outline: 1px solid var(--rule); }   /* each loop keeps its own shape */
.theme-media figcaption { margin-top: 8px; font: 500 11.5px/1.4 var(--mono); letter-spacing: 0.03em; color: var(--muted); }
.theme-q { font: var(--h2-font); letter-spacing: var(--h2-tracking); margin-bottom: 14px; }
.theme-body { font-size: 18px; line-height: 1.55; max-width: 34em; }
.theme-papers { list-style: none; margin: 18px 0 0; padding: 0; font-size: 14.5px; line-height: 1.4; }
.theme-papers li { padding: 7px 0; border-top: 1px solid var(--rule); }
.theme-papers a { text-decoration: none; }
.theme-papers a:hover { color: var(--accent); }
.theme-papers .mono { color: var(--muted); margin-left: 6px; }
.theme-hiring { margin-top: 16px; }
.theme-hiring a { font-weight: 600; text-decoration: none; border-bottom: 1px solid var(--accent); padding-bottom: 2px; }
@media (max-width: 820px) { .theme { grid-template-columns: 1fr; gap: 18px; } .theme:nth-of-type(even) .theme-media { order: 0; } }

/* hiring */
.nav-badge { display: inline-block; margin-left: 7px; padding: 3px 6px 2px; font: 600 9.5px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; background: var(--accent); color: #fff; border-radius: 2px; vertical-align: 1px; }
.hiring-strip { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 18px; padding: 18px max(var(--gutter), calc((100vw - var(--max)) / 2)); background: var(--ink); color: var(--ground); text-decoration: none; }
.hiring-label { font: 600 11px/1 var(--mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--hero-accent, #fff); }
.hiring-title { font: var(--h3-font); }
.hiring-more { margin-left: auto; font: 600 12px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; border-bottom: 1px solid currentColor; padding-bottom: 2px; }
.hiring-strip:hover .hiring-more { color: var(--hero-accent, #fff); }
.opening { margin: 0 0 44px; padding: 28px 32px; border: 1px solid var(--band-ink); max-width: 860px; }
.opening-label { font: 600 11px/1 var(--mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--band-accent); margin-bottom: 12px; }
.opening-title { font: var(--h2-font); letter-spacing: var(--h2-tracking); font-size: clamp(22px, 2.4vw, 30px); margin-bottom: 12px; }
.opening-summary { font-size: 17px; line-height: 1.55; }
.opening-who { margin-top: 10px; font-size: 16px; line-height: 1.5; color: var(--band-muted); }
.opening-action { margin-top: 20px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; }
.opening-note { font-size: 14px; color: var(--band-muted); }
.button-solid { background: var(--band-ink); color: var(--band) !important; border-color: var(--band-ink) !important; }
.button-solid:hover { opacity: 0.85; }
.display-2 { font-size: clamp(30px, 4.4vw, 62px); }
@media (min-aspect-ratio: 4/5) { .stop { max-width: min(600px, 54vw); } }

/* once the hero has scrolled away the fixed nav sits on the page color */
.past-hero .nav { background: var(--ground); color: var(--ink); border-bottom: 1px solid var(--rule); backdrop-filter: none; -webkit-backdrop-filter: none; }