:root {
  --bg: #ffffff;
  --ink: #1a1a1a;
  --muted: #555;
  --accent: #32AE97;
  --accent-deep: #195A6E;
  --accent-soft: #d9efe9;
  --rule: #e2e6e8;
  --keynote: #e6eef2;
  --break: #f1f4f6;
  --max: 980px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Source Sans Pro", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
}

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

header.site {
  background: var(--accent);
  color: #fff;
  padding: 2.4rem 1.2rem 1.6rem;
  text-align: center;
}
header.site .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.8rem;
  opacity: 0.85;
}
header.site h1 {
  margin: 0.4rem 0 0.3rem;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 600;
  font-size: 2.2rem;
  line-height: 1.15;
}
header.site .subtitle {
  font-size: 1.05rem;
  opacity: 0.95;
}

nav.site {
  background: #fff;
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  z-index: 10;
}
nav.site ul {
  list-style: none;
  margin: 0 auto;
  padding: 0;
  max-width: var(--max);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem 1.6rem;
  padding: 0.7rem 1rem;
}
nav.site a {
  color: var(--ink);
  font-weight: 600;
  font-size: 0.95rem;
}
nav.site a.active { color: var(--accent); border-bottom: 2px solid var(--accent); padding-bottom: 0.15rem; }

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.2rem 4rem;
}

h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.6rem;
  margin: 2.2rem 0 0.8rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.3rem;
}
h3 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.15rem;
  margin: 1.6rem 0 0.4rem;
}

.lede { font-size: 1.1rem; color: var(--muted); }

.callouts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.8rem;
  margin: 1.4rem 0;
}
.callouts .card {
  background: #fff;
  border: 1px solid var(--rule);
  padding: 0.9rem 1rem;
  border-radius: 4px;
}
.callouts .card .label {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.72rem;
  color: var(--muted);
}
.callouts .card .value { font-weight: 600; }

table.program {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 2rem;
  background: #fff;
  font-size: 0.95rem;
}
table.program th, table.program td {
  border: 1px solid var(--rule);
  padding: 0.55rem 0.7rem;
  vertical-align: top;
  text-align: left;
}
table.program thead th {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}
table.program td.time { white-space: nowrap; color: var(--muted); font-variant-numeric: tabular-nums; width: 8.5rem; }
table.program tr.keynote td.talk { background: var(--keynote); }
table.program tr.break td { background: var(--break); color: var(--muted); font-style: italic; }
table.program tr.poster td.talk { background: var(--accent-soft); }
table.program tr.session-head td {
  background: var(--accent-soft);
  font-weight: 600;
  font-style: italic;
}
table.program .speaker { font-weight: 600; }
table.program .title { display: block; color: var(--muted); margin-top: 0.15rem; }

.speaker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}
.speaker-grid .sp {
  background: #fff;
  border: 1px solid var(--rule);
  padding: 0.9rem 1rem;
  border-radius: 4px;
}
.speaker-grid .sp.keynote { border-left: 4px solid var(--accent); }
.speaker-grid .sp .tag { color: var(--accent-deep); }
.speaker-grid .sp .name { font-weight: 700; }
.speaker-grid .sp .tag {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-left: 0.4rem;
}
.speaker-grid .sp .talk { color: var(--muted); margin-top: 0.3rem; font-size: 0.92rem; }

.abstract { margin: 1.6rem 0 2rem; }
.abstract h3 { margin-bottom: 0.2rem; }
.abstract .meta { color: var(--muted); font-size: 0.92rem; margin-bottom: 0.6rem; }
.abstract p { margin: 0.4rem 0; text-align: justify; }

footer.site {
  border-top: 1px solid var(--rule);
  padding: 1.2rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}

@media (max-width: 600px) {
  header.site h1 { font-size: 1.6rem; }
  table.program td.time { width: auto; }
}