:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --ink: #0f172a;
  --muted: #5b6475;
  --line: #e4e7ee;
  --accent: #0ea5e9;
  --accent-ink: #075985;
  --hero-a: #0f172a;
  --hero-b: #1e3a8a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1020;
    --card: #151b2e;
    --ink: #eef2ff;
    --muted: #9aa3b8;
    --line: #262e45;
    --accent: #38bdf8;
    --accent-ink: #bae6fd;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-ink); }

.hero {
  background: linear-gradient(135deg, var(--hero-a), var(--hero-b));
  color: #fff;
  padding: calc(2.5rem + env(safe-area-inset-top)) 1.25rem 2rem;
}
.hero-inner { max-width: 760px; margin: 0 auto; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .75rem; opacity: .8; margin: 0 0 .5rem; }
.hero h1 { font-size: clamp(1.9rem, 6vw, 3rem); margin: 0 0 .25rem; line-height: 1.1; }
.tagline { margin: 0 0 .75rem; opacity: .9; }
.dates { font-weight: 600; margin: 0 0 1rem; }
.countdown { display: flex; gap: .75rem; flex-wrap: wrap; margin-bottom: .75rem; }
.countdown .pill {
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 999px;
  padding: .35rem .9rem;
  font-weight: 600;
}
.travelers { margin: 0; opacity: .85; font-size: .95rem; }

.tabs {
  position: sticky; top: 0; z-index: 10;
  display: flex; gap: .25rem; overflow-x: auto;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: .5rem .75rem;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tabs a {
  white-space: nowrap; text-decoration: none; color: var(--ink);
  padding: .45rem .9rem; border-radius: 999px; font-weight: 600; font-size: .9rem;
}
.tabs a:hover { background: var(--bg); }

main { max-width: 760px; margin: 0 auto; padding: 1rem 1rem 3rem; }
section { margin: 1.75rem 0; }
h2 { font-size: 1.35rem; margin: 0 0 .75rem; }

.cards { display: grid; gap: .75rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem 1.1rem;
}
.card h3 { margin: 0 0 .35rem; font-size: 1.05rem; }
.card .meta { color: var(--muted); font-size: .9rem; margin: 0 0 .5rem; }
.card .row { display: flex; justify-content: space-between; gap: 1rem; padding: .25rem 0; border-top: 1px dashed var(--line); }
.card .row:first-of-type { border-top: 0; }
.card .row span:first-child { color: var(--muted); }
.card .row span:last-child { text-align: right; font-weight: 600; }
.card .notes { margin: .6rem 0 0; font-size: .95rem; }
.conf { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .04em; }

.days { display: grid; gap: .75rem; }
.day { background: var(--card); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.day header { display: flex; align-items: baseline; gap: .75rem; padding: .85rem 1.1rem; border-bottom: 1px solid var(--line); }
.day header .dnum { font-weight: 800; color: var(--accent); font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; }
.day header h3 { margin: 0; font-size: 1.05rem; }
.day header .ddate { margin-left: auto; color: var(--muted); font-size: .9rem; white-space: nowrap; }
.day.today { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent) inset; }
.day ul { list-style: none; margin: 0; padding: .5rem 1.1rem .75rem; }
.day li { display: grid; grid-template-columns: 4.2rem 1fr; gap: .5rem; padding: .45rem 0; }
.day li .t { color: var(--accent-ink); font-weight: 700; font-variant-numeric: tabular-nums; }
.day li .d { color: var(--muted); font-size: .92rem; }
.day li .d:empty { display: none; }

.card ul.plain { margin: 0; padding-left: 1.1rem; }
.card ul.plain li { margin: .3rem 0; }

.contacts { display: grid; gap: .5rem; }
.contact {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: .8rem 1rem;
}
.contact .who strong { display: block; }
.contact .who span { color: var(--muted); font-size: .88rem; }
.contact a.call {
  text-decoration: none; background: var(--accent); color: #04121c;
  padding: .5rem .9rem; border-radius: 999px; font-weight: 700; white-space: nowrap;
}
.empty { color: var(--muted); font-style: italic; }
footer { text-align: center; color: var(--muted); font-size: .85rem; padding: 1rem 1rem calc(1.5rem + env(safe-area-inset-bottom)); }

/* People and speaker sheet */
.hint { color: var(--muted); font-size: .9rem; margin: -.25rem 0 .75rem; }
.people-group { margin-bottom: 1rem; }
.people-group h3 { font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); margin: 0 0 .5rem; }
.chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.person-chip { border: 1px solid var(--line); background: var(--card); color: var(--ink); border-radius: 999px; padding: .5rem .85rem; font-size: .95rem; cursor: pointer; font-family: inherit; }
.person-chip:active { background: var(--accent); color: #04121c; }
.person-link { background: none; border: 0; padding: 0; font: inherit; color: var(--accent-ink); text-decoration: underline; text-decoration-style: dotted; text-underline-offset: 3px; cursor: pointer; }
.sheet-backdrop { position: fixed; inset: 0; background: rgba(2, 6, 23, .55); z-index: 40; }
.sheet { position: fixed; left: 0; right: 0; bottom: 0; z-index: 41; background: var(--card); color: var(--ink); border-radius: 20px 20px 0 0; padding: 1.1rem 1.25rem calc(1.5rem + env(safe-area-inset-bottom)); max-height: 80vh; overflow-y: auto; max-width: 760px; margin: 0 auto; box-shadow: 0 -8px 30px rgba(0,0,0,.25); animation: rise .2s ease-out; }
@keyframes rise { from { transform: translateY(30px); opacity: 0; } to { transform: none; opacity: 1; } }
.sheet-close { position: absolute; top: .9rem; right: 1rem; border: 1px solid var(--line); background: var(--bg); color: var(--ink); border-radius: 999px; padding: .35rem .8rem; font-weight: 600; cursor: pointer; }
.sheet-event { text-transform: uppercase; letter-spacing: .08em; font-size: .75rem; color: var(--accent); margin: 0 0 .25rem; }
.sheet h3 { margin: 0 4rem .2rem 0; font-size: 1.35rem; }
.sheet-role { color: var(--muted); margin: 0 0 .75rem; }
.sheet-bio { margin: 0 0 1rem; line-height: 1.55; }
.sheet-links { display: flex; flex-wrap: wrap; gap: .5rem; }
.sheet-links a { text-decoration: none; background: var(--accent); color: #04121c; padding: .5rem .9rem; border-radius: 999px; font-weight: 700; font-size: .9rem; }