/* ============================================================
   CHI 2026 landing page — styles
   Standalone styles for the Augmented Human Lab @ CHI 2026 page.
   Not linked to the main ahlab.org theme — this is a separate site.
   ============================================================ */

:root {
  --color-accent:       #6100FF;
  --color-accent-dark:  #4400B3;
  --color-accent-light: #904DFF;
  --gradient-start:     #00D7EE;
  --gradient-end:       #6100FF;
  --gradient:           linear-gradient(221deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
  --color-neutral-10:   #FFFFFF;
  --color-neutral-20:   #F4F7F9;
  --color-neutral-30:   #EDF0F3;
  --color-neutral-40:   #C9D8E3;
  --color-neutral-60:   #AAAFB6;
  --color-neutral-70:   #838D95;
  --color-neutral-80:   #5E6875;
  --color-neutral-100:  #0E0F11;
  --font-display:       "neue-haas-grotesk-display", sans-serif;
  --font-text:          "neue-haas-grotesk-text", sans-serif;
  --radius-sm:          8px;
  --radius:             12px;
  --radius-lg:          16px;
}

/* ── Reset & base ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-text);
  font-weight: 400;
  font-size: 16px;
  line-height: 24px;
  color: var(--color-neutral-100);
  background: var(--color-neutral-10);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a   { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul  { list-style: none; }

.container {
  width: 100%;
  max-width: 1370px;
  margin: 0 auto;
  padding: 0 40px;
}
@media (max-width: 767px) { .container { padding: 0 20px; } }

/* ── Navigation ───────────────────────────────────────── */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 0 40px; height: 92px;
  display: flex; align-items: center; justify-content: space-between;
  transition: background .4s, box-shadow .4s;
}
.site-nav.scrolled {
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 rgba(0,0,0,.06);
}
.nav-brand {
  font-family: var(--font-display);
  font-weight: 700; font-size: 16px;
  letter-spacing: -.01em;
  color: #fff;
  transition: color .3s;
}
.site-nav.scrolled .nav-brand { color: var(--color-neutral-100); }
.nav-back {
  font-family: var(--font-text);
  font-weight: 500; font-size: 14px;
  letter-spacing: .02em;
  color: rgba(255,255,255,.7);
  transition: color .3s;
  display: inline-flex; align-items: center; gap: 8px;
}
.nav-back:hover { color: #fff; }
.site-nav.scrolled .nav-back { color: var(--color-neutral-80); }
.site-nav.scrolled .nav-back:hover { color: var(--color-accent); }

/* ── Hero ─────────────────────────────────────────────── */
.hero { position: relative; padding: 160px 0 80px; overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: 0; background: var(--gradient); }
.hero .container { position: relative; z-index: 2; }

.hero-eyebrow {
  font-family: var(--font-display);
  font-weight: 800; font-size: 12px;
  letter-spacing: 1.71px; text-transform: uppercase;
  color: rgba(255,255,255,.55);
  margin-bottom: 20px;
}
.hero h1 {
  font-family: var(--font-display);
  font-weight: 700; font-size: 72px;
  line-height: .98; letter-spacing: -.02em;
  color: #fff;
  max-width: 1100px;
  margin-bottom: 36px;
}
.hero h1 .hero-h1-sub {
  display: block;
  font-weight: 300; font-style: italic;
  color: rgba(255,255,255,.8);
}
.hero-meta {
  display: flex; flex-wrap: wrap; gap: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,.2);
  max-width: 900px;
}
.meta-group { display: flex; flex-direction: column; gap: 6px; }
.meta-label {
  font-family: var(--font-display);
  font-weight: 800; font-size: 11px;
  letter-spacing: 1.5px; text-transform: uppercase;
  color: rgba(255,255,255,.55);
}
.meta-value {
  font-family: var(--font-display);
  font-weight: 400; font-size: 20px;
  color: #fff;
}
@media (max-width: 991px) {
  .hero { padding: 140px 0 60px; }
  .hero h1 { font-size: 52px; }
  .hero-meta { gap: 32px; }
  .meta-value { font-size: 17px; }
}
@media (max-width: 567px) {
  .hero h1 { font-size: 40px; }
  .hero-meta { gap: 24px; flex-direction: column; }
}

/* ── Video section ────────────────────────────────────── */
.video-section { padding: 80px 0 60px; }
.video-header { display: flex; align-items: baseline; gap: 16px; margin-bottom: 28px; }
.video-label {
  font-family: var(--font-display);
  font-weight: 800; font-size: 12px;
  letter-spacing: 1.71px; text-transform: uppercase;
  color: var(--color-neutral-60);
}
.video-hint { font-family: var(--font-text); font-size: 13px; color: var(--color-neutral-60); }
.video-wrapper {
  position: relative; width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(14,15,17,.12);
}
.video-wrapper iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
@media (max-width: 767px) { .video-section { padding: 56px 0 40px; } }

/* ── About / Impact ──────────────────────────────────── */
.about { padding: 80px 0 20px; }
.about-intro { max-width: 820px; margin: 0 auto 64px; text-align: center; }
.about-intro .section-eyebrow {
  font-family: var(--font-display); font-weight: 800; font-size: 12px;
  letter-spacing: 1.71px; text-transform: uppercase;
  color: var(--color-neutral-60); margin-bottom: 20px;
}
.about-intro h2 {
  font-family: var(--font-display); font-weight: 700;
  font-size: 42px; line-height: 1.1; letter-spacing: -.02em;
  color: var(--color-neutral-100); margin-bottom: 28px;
}
.about-intro p {
  font-size: 17px; line-height: 1.65;
  color: var(--color-neutral-80); margin-bottom: 16px;
}
.about-intro p strong { color: var(--color-neutral-100); font-weight: 600; }
.impact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.impact-card {
  padding: 32px 28px;
  background: var(--color-neutral-20);
  border-radius: var(--radius-lg);
  border-top: 3px solid var(--color-accent);
  transition: box-shadow .3s ease;
}
.impact-card:hover { box-shadow: 0 12px 32px rgba(14,15,17,.08); }
.impact-label {
  font-family: var(--font-display); font-weight: 800; font-size: 11px;
  letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--color-accent); margin-bottom: 16px;
}
.impact-card h3 {
  font-family: var(--font-display); font-weight: 700;
  font-size: 22px; line-height: 1.25;
  color: var(--color-neutral-100); margin-bottom: 10px;
}
.impact-card p { font-size: 14px; line-height: 1.55; color: var(--color-neutral-70); }
@media (max-width: 991px) {
  .about { padding: 60px 0 0; }
  .about-intro h2 { font-size: 32px; }
  .about-intro { margin-bottom: 48px; }
  .impact-grid { grid-template-columns: 1fr; gap: 16px; }
  .impact-card { padding: 24px 22px; }
}

/* ── Schedule ─────────────────────────────────────────── */
.schedule { padding: 60px 0 120px; }
.schedule-group { margin-bottom: 64px; }
.schedule-group:last-child { margin-bottom: 0; }
.schedule-group-header {
  display: flex; align-items: baseline; gap: 16px;
  margin-bottom: 28px; padding-bottom: 16px;
  border-bottom: 1px solid var(--color-neutral-30);
}
.schedule-group-header h2 {
  font-family: var(--font-display); font-weight: 700;
  font-size: 28px; letter-spacing: -.01em;
  color: var(--color-neutral-100);
}
.schedule-group-header .count {
  font-family: var(--font-text); font-size: 13px;
  color: var(--color-neutral-60);
}
.schedule-list { display: flex; flex-direction: column; gap: 16px; }

.schedule-card {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 0;
  padding: 0;
  background: var(--color-neutral-20);
  border-radius: var(--radius-lg);
  overflow: hidden;
  align-items: stretch;
  position: relative;
  min-height: 180px;
  transition: box-shadow .3s ease;
}
.schedule-card:hover { box-shadow: 0 12px 32px rgba(14,15,17,.08); }

.schedule-thumb {
  position: relative;
  width: 100%;
  height: 100%;
  background: var(--color-neutral-30);
  display: block;
  text-decoration: none;
  overflow: hidden;
  align-self: stretch;
}
.schedule-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.schedule-thumb-placeholder {
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  font-family: var(--font-display); font-weight: 700; font-size: 14px;
  text-align: center; padding: 8px;
}

.schedule-body {
  display: flex; flex-direction: column; gap: 8px;
  padding: 24px 28px;
  min-width: 0;
}
.schedule-card:has(.schedule-award) .schedule-body { padding-right: 56px; }
.schedule-title-row { display: block; }
.schedule-body h3 {
  font-family: var(--font-display); font-weight: 700;
  font-size: 18px; line-height: 1.3;
  color: var(--color-neutral-100);
}

.schedule-award {
  position: absolute;
  top: 16px;
  right: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, #FFD700, #FFA500);
  color: #fff;
  font-size: 12px;
  z-index: 2;
}

.schedule-presenter { font-size: 14px; color: var(--color-neutral-80); }
.schedule-presenter strong { color: var(--color-neutral-100); font-weight: 500; }
.schedule-presenter a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .3s;
}
.schedule-presenter a:hover { border-bottom-color: var(--color-accent); }

.schedule-presenter-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 24px;
  font-size: 13px;
  color: var(--color-neutral-80);
}
.schedule-presenter-row strong { color: var(--color-neutral-100); font-weight: 500; }
.schedule-presenter-row a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .3s;
}
.schedule-presenter-row a:hover { border-bottom-color: var(--color-accent); }
.schedule-presenter { font-size: 14px; color: var(--color-neutral-80); }
.schedule-presenter strong { color: var(--color-neutral-100); font-weight: 500; }
.schedule-presenter a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .3s;
}
.schedule-presenter a:hover { border-bottom-color: var(--color-accent); }
.schedule-session {
  display: inline-block;
  font-family: var(--font-text); font-weight: 500;
  font-size: 11px; letter-spacing: .04em; text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(97,0,255,.08);
  padding: 4px 10px; border-radius: 999px;
  width: fit-content;
  margin-top: 2px;
}

.schedule-when {
  font-family: var(--font-text); font-size: 13px;
  color: var(--color-neutral-70);
  letter-spacing: .01em;
  margin-top: 4px;
}
.schedule-when strong { color: var(--color-neutral-100); font-weight: 500; }

@media (max-width: 767px) {
  .schedule { padding: 40px 0 80px; }
  .schedule-card { grid-template-columns: 1fr; gap: 0; padding: 0; }
  .schedule-thumb { width: 100%; height: 220px; min-height: 220px; max-height: 220px; }
  .schedule-body { padding: 20px 50px 20px 22px; }
  .schedule-group-header h2 { font-size: 22px; }
}

/* ── Footer ───────────────────────────────────────────── */
.site-footer { background: var(--color-neutral-100); padding: 48px 0; }
.footer-row {
  display: flex; justify-content: space-between; align-items: center;
  gap: 24px; flex-wrap: wrap;
}
.footer-brand {
  font-family: var(--font-display); font-weight: 700;
  font-size: 15px; color: #fff;
}
.footer-brand span {
  font-weight: 400; color: var(--color-neutral-60); margin-left: 8px;
}
.footer-meta {
  display: flex; gap: 24px;
  font-family: var(--font-text); font-size: 13px;
  color: rgba(255,255,255,.5);
}
.footer-meta a { transition: color .3s; }
.footer-meta a:hover { color: #fff; }
@media (max-width: 567px) {
  .footer-row { flex-direction: column; align-items: flex-start; }
}

/* ── Reveal animations ────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero h1,
.hero-meta,
.video-section .container {
  animation: fadeUp .8s cubic-bezier(.16,1,.3,1) both;
}
.hero h1                  { animation-delay: .1s; }
.hero-meta                { animation-delay: .3s; }
.video-section .container { animation-delay: .45s; }
@media (prefers-reduced-motion: reduce) {
  .hero h1, .hero-meta, .video-section .container { animation: none; }
}