:root {
  --bg: #f7f8fb;
  --ink: #1a2332;
  --ink-soft: #475066;
  --accent: #2f6db5;
  --accent-soft: #6c9ed6;
  --rule: #dde3ec;
  --max-w: 760px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

#cortex {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

main {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 8vh 24px 6vh;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0 0 0.4em;
  letter-spacing: -0.01em;
  font-weight: 600;
}

.tagline {
  font-size: 1.15rem;
  color: var(--ink-soft);
  margin: 0 0 2.5em;
}

.intro {
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1.5em 1.75em;
  margin-bottom: 3em;
}

.intro p {
  margin: 0 0 1.2em;
}

.bridge {
  margin: 1.5em 0 0.25em;
  text-align: center;
}

.bridge svg {
  width: 100%;
  max-width: 520px;
  height: auto;
}

.bridge .bio circle {
  fill: var(--accent);
  fill-opacity: 0.85;
}
.bridge .bio path {
  fill: none;
  stroke: var(--accent-soft);
  stroke-width: 1.4;
  opacity: 0.8;
}
.bridge .arrow line {
  stroke: var(--ink-soft);
  stroke-width: 1.6;
}
.bridge .arrow polygon {
  fill: var(--ink-soft);
}
.bridge .model rect {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.6;
}
.bridge .model .chip-inner {
  fill: var(--accent);
  fill-opacity: 0.12;
  stroke: var(--accent-soft);
}
.bridge .model line {
  stroke: var(--accent);
  stroke-width: 1.4;
}
.bridge .model .eq {
  font-family: "Cambria Math", "Latin Modern Math", Georgia, serif;
  font-style: italic;
  font-size: 16px;
  fill: var(--ink);
}
.bridge .label {
  font-size: 12px;
  fill: var(--ink-soft);
  font-style: normal;
  letter-spacing: 0.02em;
}

.events {
  margin-top: 3em;
}
.events h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 0 0 1em;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.4em;
}
.event-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.event-list li {
  padding: 0.7em 0;
  border-bottom: 1px solid var(--rule);
  display: flex;
  gap: 1em;
  align-items: baseline;
  flex-wrap: wrap;
}
.event-list time {
  flex: 0 0 7em;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
  font-size: 0.92em;
}
.event-list .ev-title {
  font-weight: 500;
}
.event-list .ev-meta {
  flex-basis: 100%;
  margin-left: 8em;
  color: var(--ink-soft);
  font-size: 0.92em;
}
.event-list .ev-empty {
  color: var(--ink-soft);
  font-style: italic;
  padding: 0.5em 0;
  border: none;
}

.ev-agenda {
  flex-basis: 100%;
  margin-left: 8em;
  margin-top: 0.4em;
}
.ev-agenda summary {
  cursor: pointer;
  display: inline-block;
  font-size: 0.85em;
  color: var(--accent);
  padding: 0.25em 0.7em;
  border: 1px solid var(--accent-soft);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
  list-style: none;
  user-select: none;
}
.ev-agenda summary::-webkit-details-marker { display: none; }
.ev-agenda summary::before {
  content: "▸ ";
  font-size: 0.85em;
}
.ev-agenda[open] summary::before { content: "▾ "; }
.ev-agenda summary:hover { background: rgba(47, 109, 181, 0.08); }
.ev-agenda ul {
  margin: 0.6em 0 0.2em;
  padding-left: 1.1em;
  font-size: 0.92em;
  color: var(--ink-soft);
}
.ev-agenda li { padding: 0.15em 0; border: none; display: list-item; }

@media (max-width: 540px) {
  .ev-agenda { margin-left: 0; }
}

.past {
  margin-top: 1.5em;
}
.past summary {
  cursor: pointer;
  color: var(--ink-soft);
  padding: 0.4em 0;
}

.contribute {
  margin-top: 1.5em;
  font-size: 0.92em;
  color: var(--ink-soft);
}

footer {
  margin-top: 5em;
  padding-top: 1.5em;
  border-top: 1px solid var(--rule);
  font-size: 0.9em;
  color: var(--ink-soft);
}

@media (max-width: 540px) {
  main { padding: 5vh 18px; }
  .intro { padding: 1.1em 1.2em; }
  .event-list li { flex-direction: column; gap: 0.15em; }
  .event-list .ev-meta { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  #cortex { display: none; }
}