:root {
  --bg: #fbfbf8;
  --bg-alt: #eef5f0;
  --surface: #ffffff;
  --border: #dde5de;
  --text: #1b2420;
  --text-dim: #4d5c56;
  --accent: #1f7a4d;
  --accent-2: #1f6fb2;
  --accent-soft: rgba(31, 122, 77, 0.1);
  --max-width: 1040px;
  --radius: 14px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
}

h1, h2, h3 {
  font-family: "Georgia", "Iowan Old Style", serif;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(251, 251, 248, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  letter-spacing: 0.04em;
}
.brand:hover { text-decoration: none; }
.bolt { color: var(--accent); font-size: 1.1rem; }
nav {
  display: flex;
  gap: 24px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.9rem;
}
nav a {
  color: var(--text-dim);
}
nav a:hover { color: var(--accent); text-decoration: none; }

/* Hero */
.hero {
  padding: 90px 0 70px;
  background:
    radial-gradient(700px 320px at 15% 0%, var(--accent-soft), transparent 60%),
    radial-gradient(600px 300px at 85% 20%, rgba(31, 111, 178, 0.1), transparent 60%);
  border-bottom: 1px solid var(--border);
}
.eyebrow {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.75rem;
  color: var(--accent-2);
  margin: 0 0 18px;
}
h1 {
  font-size: clamp(2.1rem, 4.5vw, 3.2rem);
  margin: 0 0 22px;
  max-width: 15ch;
}
h1 .hl {
  color: var(--accent);
}
.tagline {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 62ch;
  margin: 0 0 36px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.meta-chip {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.meta-chip strong {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}
.meta-chip span {
  font-size: 0.92rem;
  color: var(--text);
}

/* Sections */
section {
  padding: 68px 0;
  border-bottom: 1px solid var(--border);
}
section.alt {
  background: var(--bg-alt);
}
h2 {
  font-size: 1.6rem;
  margin: 0 0 26px;
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.num {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 3px 10px;
  letter-spacing: 0.05em;
}
.section-intro {
  color: var(--text-dim);
  max-width: 76ch;
  margin: -6px 0 32px;
}
.prose p {
  max-width: 76ch;
  color: var(--text);
}
.prose p + p { margin-top: 18px; }

.keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}
.keywords span {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.8rem;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(31, 122, 77, 0.3);
  border-radius: 999px;
  padding: 5px 14px;
}

/* Topic grid */
.topic-grid, .usecase-grid, .chair-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
}
.topic-card, .usecase-card, .chair-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
}
.topic-card h3, .usecase-card h3, .chair-card h3 {
  margin: 0 0 12px;
  font-size: 1.15rem;
  color: var(--accent);
}
.chair-photo {
  display: block;
  width: 96px;
  height: 96px;
  object-fit: cover;
  border-radius: 50%;
  margin: 0 0 16px;
  border: 2px solid var(--border);
}
.chair-card h3 { margin-top: 0; }
.topic-card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--text-dim);
}
.topic-card li + li { margin-top: 12px; }
.usecase-card p { color: var(--text-dim); margin: 0; }

/* Schedule table */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.92rem;
}
thead th {
  text-align: left;
  background: var(--surface);
  color: var(--accent);
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}
tbody td {
  padding: 13px 18px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
tbody tr:last-child td { border-bottom: none; }
tr.row-break td {
  background: var(--bg-alt);
  color: var(--text-dim);
  font-style: italic;
  text-align: center;
}

.cta-button {
  display: inline-block;
  margin-top: 6px;
  padding: 12px 24px;
  background: var(--accent-2);
  color: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 999px;
  transition: opacity 0.15s ease;
}
.cta-button:hover {
  text-decoration: none;
  opacity: 0.88;
}

/* Chairs */
.affiliation {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.82rem;
  color: var(--accent-2);
  margin: 0 0 12px;
}
.bio {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin: 0 0 14px;
}
.chair-card a {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.85rem;
}

/* References */
.refs {
  padding-left: 22px;
  color: var(--text-dim);
  max-width: 78ch;
}
.refs li + li { margin-top: 14px; }
.refs em { color: var(--text); font-style: italic; }

/* Footer */
.site-footer {
  padding: 40px 0 60px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text-dim);
  font-size: 0.85rem;
}
.site-footer p { margin: 4px 0; }

@media (max-width: 640px) {
  nav { display: none; }
  .hero { padding: 60px 0 46px; }
  section { padding: 48px 0; }
}