/* Gradient AGM/26 — Signal Terrain event identity
   Tokens per design handoff: cream #FAF9F6, ink #11191F, red #EA4335.
   No shadows, no gradients, no radius except pill buttons. */

@font-face {
  font-family: 'FK Grotesk';
  src: url('fonts/FKGrotesk-Regular.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'FK Grotesk';
  src: url('fonts/FKGrotesk-Bold.woff2') format('woff2');
  font-weight: 700;
  font-display: swap;
}

:root {
  --cream: #FAF9F6;
  --ink: #11191F;
  --red: #EA4335;
  --ink-70: rgba(17, 25, 31, 0.7);
  /* muted metadata tier: 0.62 is the lightest ink that passes WCAG AA (4.89:1) on cream */
  --ink-muted: rgba(17, 25, 31, 0.62);
  --hair: rgba(17, 25, 31, 0.12);
  --hair-15: rgba(17, 25, 31, 0.15);
  --cream-70: rgba(250, 249, 246, 0.7);
  --sans: 'FK Grotesk', Inter, sans-serif;
  --mono: 'FK Grotesk Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --pad: 40px;
  --rhythm: 96px;
  --max: 1440px;
  --ease: cubic-bezier(0.2, 0, 0, 1);
  /* giant footer wordmark: 196px at the 1200px reference width, capped at the 1440 container */
  --wm: min(16.34vw, 235px);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--sans);
}

h1, h2, p, ul { margin: 0; }
ul { padding: 0; list-style: none; }

a {
  color: var(--ink);
  text-decoration: none;
  transition: color 150ms ease;
}
a:hover { color: var(--red); }
:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--cream);
  padding: 8px 16px;
  font: 400 14px/1 var(--sans);
}
.skip-link:focus { left: 0; z-index: 10; color: var(--cream); }

/* ---- Announcement strip ---- */
.strip { background: var(--ink); }
.strip-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 10px var(--pad);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  color: var(--cream);
  font: 400 11px/16px var(--mono);
  letter-spacing: 0.08em;
}
.strip-mid { color: var(--cream-70); }
.strip-cta { color: var(--red); }
.strip-cta:hover { color: var(--cream); }
.strip-short { display: none; }

/* ---- Header ---- */
.site-header {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 36px var(--pad);
}
.wordmark { display: inline-flex; align-items: center; }
.wordmark img { display: block; height: 26px; width: auto; }

/* ---- Hero ---- */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: var(--rhythm) var(--pad) 0;
}
.kicker {
  font: 400 12px/18px var(--mono);
  letter-spacing: 0.1em;
  color: var(--red);
}
h1 {
  font: 700 clamp(46px, 7vw, 84px)/1.02 var(--sans);
  letter-spacing: -0.035em;
  margin-top: 20px;
}
.sub {
  font: 400 clamp(19px, 2vw, 24px)/1.33 var(--sans);
  color: var(--ink-70);
  max-width: 640px;
  margin-top: 20px;
}
.meta {
  display: flex;
  flex-wrap: wrap;
  column-gap: 48px;
  row-gap: 12px;
  margin-top: 36px;
  font: 400 12px/20px var(--mono);
  letter-spacing: 0.06em;
}
.meta-red { color: var(--red); }
.meta-dim { color: var(--ink-muted); }

/* ---- Contour band (printed plate, never behind text) ---- */
.plate-band {
  max-width: var(--max);
  margin: 0 auto;
  padding: 48px var(--pad) 0;
}
.plate-band img {
  display: block;
  width: 100%;
  height: 340px;
  object-fit: cover;
  object-position: 42% 55%;
  border: 1px solid var(--hair);
}

/* ---- Agenda ---- */
.agenda {
  max-width: var(--max);
  margin: 0 auto;
  padding: var(--rhythm) var(--pad) 0;
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 40px;
}
.agenda h2 {
  font: 400 clamp(32px, 3.7vw, 44px)/1.09 var(--sans);
  letter-spacing: -0.02em;
}
.agenda-note {
  font: 400 12px/20px var(--mono);
  letter-spacing: 0.06em;
  color: var(--ink-muted);
  margin-top: 16px;
}
.rows { border-top: 1px solid var(--hair-15); }
.rows li {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 24px;
  align-items: start;
  padding: 20px 0;
  border-bottom: 1px solid var(--hair-15);
}
.rows .t {
  font: 400 12px/16px var(--mono);
  letter-spacing: 0.06em;
  color: var(--red);
  padding-top: 5px;
}
.rows .s {
  font: 400 clamp(18px, 1.85vw, 22px)/1.18 var(--sans);
  letter-spacing: -0.01em;
}
/* collapsible speaker rows: the row is a <summary>, cards drop down on open */
.rows li.li-exp { padding: 0; display: block; }
.rows summary {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  gap: 24px;
  align-items: start;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
}
.rows summary::-webkit-details-marker { display: none; }
.rows summary .s { transition: color 150ms ease; }
.rows summary:hover .s { color: var(--red); }
.exp-hint { display: inline-flex; align-items: center; padding-top: 5px; }
/* collapsed: compact speaker names under the title; hidden once the cards are open */
.speakers-line {
  font: 400 10px/15px var(--mono);
  letter-spacing: 0.05em;
  color: var(--ink-muted);
  margin-top: 6px;
}
.row-d[open] .speakers-line { display: none; }
.sp-mod { color: var(--ink); white-space: nowrap; }
.mod-pre { color: var(--red); letter-spacing: 0.08em; }
.sp-tba { border: 1px dashed var(--hair-15); padding: 1px 5px; }
.sp-sep { color: rgba(17, 25, 31, 0.3); }
/* downward chevron, drawn in CSS; flips up when the row is open */
.exp-caret {
  width: 9px;
  height: 9px;
  margin-top: 2px;
  border-right: 1.5px solid var(--red);
  border-bottom: 1.5px solid var(--red);
  display: inline-block;
  transform: rotate(45deg);
  transition: transform 180ms var(--ease);
}
.row-d:not([open]) summary:hover .exp-caret { transform: translateY(3px) rotate(45deg); }
.row-d[open] .exp-caret { transform: translateY(3px) rotate(225deg); }
.cards-wrap { padding: 2px 0 24px calc(90px + 24px); }
.row-d[open] .cards { animation: cards-in 240ms var(--ease); }
@keyframes cards-in {
  from { opacity: 0; transform: translateY(-6px); }
}

/* speaker cards under a session */
.cards {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 48px;
}
.card { display: flex; align-items: center; gap: 14px; }
.hs {
  width: 96px;
  height: 96px;
  flex: none;
  border: 1px solid var(--hair-15);
  display: flex;
  align-items: center;
  justify-content: center;
  font: 400 24px/1 var(--mono);
  letter-spacing: 0.04em;
  color: var(--ink-70);
  background: rgba(17, 25, 31, 0.04);
}
img.hs {
  object-fit: cover;
  /* one consistent treatment across mixed founder photos */
  filter: grayscale(1);
}
.hs-tba { border-style: dashed; color: var(--ink-muted); background: transparent; font-size: 22px; }
.card-txt { display: flex; flex-direction: column; gap: 3px; }
.card-name { font: 400 18px/1.15 var(--sans); letter-spacing: -0.01em; }
.card-dim { color: var(--ink-muted); }
.card-org { font: 400 10px/1.2 var(--mono); letter-spacing: 0.06em; color: var(--ink-muted); }
a.card-org:hover { color: var(--red); }
.hs-link { display: inline-flex; }
.hs-link:hover .hs, .hs-link:hover img.hs { border-color: var(--red); }
.card-mod { font: 400 9px/1 var(--mono); letter-spacing: 0.1em; color: var(--red); margin-bottom: 1px; }

/* ---- Registration CTA ---- */
.register {
  max-width: calc(var(--max) - 2 * var(--pad));
  margin: var(--rhythm) auto 0;
  border: 1px solid var(--ink);
  display: grid;
  grid-template-columns: 1fr 1fr;
}
@media (max-width: 1440px) {
  .register { margin-left: var(--pad); margin-right: var(--pad); }
}
.reg-left {
  padding: 48px 40px;
  border-right: 1px solid var(--hair);
}
.reg-left h2 {
  font: 400 clamp(28px, 3.34vw, 40px)/1.1 var(--sans);
  letter-spacing: -0.02em;
}
.reg-right {
  padding: 48px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.reg-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}
.g-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 24px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  font: 400 18px/1 var(--sans);
  cursor: pointer;
  transition: background 180ms var(--ease), color 180ms var(--ease);
}
.g-btn:hover { background: var(--ink); color: var(--cream); }
.g-btn--red { border-color: var(--red); color: var(--red); }
.g-btn--red:hover { background: var(--red); color: var(--cream); }
.reg-mail {
  font: 400 11px/16px var(--mono);
  letter-spacing: 0.06em;
  color: var(--ink-70);
}
/* red hover would drop below AA on cream at this size; deepen instead */
.reg-mail:hover { color: var(--ink); }

/* ---- Footer ---- */
.site-footer { margin-top: 120px; border-top: 1px solid var(--hair-15); }
.foot-meta {
  max-width: var(--max);
  margin: 0 auto;
  padding: 40px var(--pad) 0;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  column-gap: 48px;
  row-gap: 12px;
  font: 400 14px/20px var(--sans);
  color: var(--ink-70);
}
.foot-meta a { color: var(--ink); }
.foot-meta a:hover { color: var(--red); }
.foot-tag {
  font: 400 11px/20px var(--mono);
  letter-spacing: 0.06em;
  margin-left: auto;
  color: var(--red);
}
.giant-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px var(--pad) 0;
  overflow: hidden;
}
.giant {
  font: 700 var(--wm)/0.85 var(--sans);
  letter-spacing: -0.03em;
}
.bleed {
  display: block;
  width: 100%;
  height: 110px;
  object-fit: cover;
  object-position: 40% 58%;
  border-top: 1px solid var(--hair);
}

/* ---- Responsive ---- */
@media (max-width: 920px) {
  .agenda { grid-template-columns: 1fr; gap: 36px; }
  .agenda-note { margin-top: 12px; }
}

@media (max-width: 800px) {
  .register { grid-template-columns: 1fr; }
  .reg-left { border-right: none; border-bottom: 1px solid var(--hair); }
}

@media (max-width: 720px) {
  :root { --pad: 24px; --rhythm: 72px; }
  .strip-mid { display: none; }
  .site-header { padding-top: 24px; padding-bottom: 24px; }
  .plate-band img { height: 260px; }
  .site-footer { margin-top: 88px; }
  .reg-left, .reg-right { padding: 36px 28px; }
}

@media (max-width: 560px) {
  .strip-long { display: none; }
  .strip-short { display: inline; }
  .wordmark img { height: 21px; }
  .meta { flex-direction: column; row-gap: 8px; }
  .plate-band img { height: 220px; }
  .rows li { grid-template-columns: 64px 1fr; padding: 16px 0; }
  .rows li.li-exp { padding: 0; }
  .rows summary { grid-template-columns: 64px 1fr auto; gap: 16px; padding: 16px 0; }
  .cards-wrap { padding-left: 0; }
  .cards { gap: 14px 24px; }
  .hs { width: 72px; height: 72px; font-size: 18px; }
  .card-name { font-size: 16px; }
  .bleed { height: 84px; }
}

@media (max-width: 400px) {
  :root { --pad: 20px; }
  .reg-left, .reg-right { padding: 28px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  a, .g-btn, .exp-caret, .rows summary .s { transition: none; }
  .row-d[open] .cards { animation: none; }
}