:root {
  --bg: #0b0c10;
  --card: #121318;
  --text: #e9edf1;
  --muted: #b8c0cc;
  --brand: #6ee7ff;
  --brand-2: #7cfc9a;
  --accent: #ffd36e;
  --border: #1f2330;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
  --radius: 18px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Noto Sans, Ubuntu, Cantarell, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7fb;
    --card: #ffffff;
    --text: #0c1320;
    --muted: #5b6680;
    --brand: #0066cc;
    --border: #d0d5e0;
    --shadow: 0 6px 24px rgba(0,0,0,0.08);
  }
}

body.force-light {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #0c1320;
  --muted: #5b6680;
  --brand: #0066cc;
  --border: #d0d5e0;
  --shadow: 0 6px 24px rgba(0,0,0,0.08);
}

body.force-dark {
  --bg: #0b0c10;
  --card: #121318;
  --text: #e9edf1;
  --muted: #b8c0cc;
  --brand: #6ee7ff;
  --border: #1f2330;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.55;
  min-height: 100vh;
}

a {
  color: var(--brand);
  text-decoration: none;
  transition: all 0.2s ease;
}

.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px;
  padding-top: 40px;
}

/* Theme Toggle - Fixed Position */
#themeBtn {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  box-shadow: var(--shadow);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
}

#themeBtn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(0,0,0,0.15);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  box-shadow: var(--shadow);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(0,0,0,0.15);
  text-decoration: none;
}

.btn.primary {
  background: var(--brand);
  color: #ffffff;
  border: none;
}

body.force-dark .btn.primary {
  background: var(--brand);
  color: #06121a;
}

.btn svg {
  width: 18px;
  height: 18px;
}

/* Header */
header.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: center;
  padding: 28px 0 6px;
}

.badge {
  display: inline-block;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.3px;
}

h1 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.08;
  margin: 14px 0 12px;
}

.subtitle {
  color: var(--muted);
  font-size: clamp(15px, 2vw, 18px);
}

.cta {
  display: flex;
  gap: 12px;
  margin-top: 20px;
  flex-wrap: wrap;
  align-items: center;
}

.hero-card {
  background: radial-gradient(1200px 400px at 20% -10%, rgba(110,231,255,0.10), transparent), var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

body.force-dark .hero-card {
  background: radial-gradient(1000px 300px at 30% 0%, rgba(110,231,255,0.08), transparent),
              linear-gradient(135deg, rgba(110,231,255,0.03), transparent 50%),
              var(--card);
  border-color: rgba(110,231,255,0.15);
}

@media (prefers-color-scheme: dark) {
  .hero-card {
    background: radial-gradient(1000px 300px at 30% 0%, rgba(110,231,255,0.08), transparent),
                linear-gradient(135deg, rgba(110,231,255,0.03), transparent 50%),
                var(--card);
    border-color: rgba(110,231,255,0.15);
  }
}

.meta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 10px;
  color: var(--muted);
}

.pill {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 14px;
}

/* Grid & Cards */
.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}

.h2 {
  font-size: 22px;
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.muted {
  color: var(--muted);
}

/* Agenda */
.agenda-item {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-top: 6px;
  margin-bottom: 6px;
  transition: all 0.2s ease;
  position: relative;
  background: rgba(0, 0, 0, 0.02);
}

body.force-light .agenda-item {
  background: rgba(0, 0, 0, 0.015);
}

body.force-dark .agenda-item {
  background: rgba(255, 255, 255, 0.02);
}

.agenda-item:has(a) {
  cursor: pointer;
}

.agenda-item:has(a):hover {
  border-color: var(--brand);
  background: rgba(110, 231, 255, 0.05);
  transform: translateX(4px);
  box-shadow: var(--shadow);
}

body.force-light .agenda-item:has(a):hover {
  background: rgba(0, 102, 204, 0.05);
}

.agenda-item h4 {
  margin: 0 0 6px;
  font-size: 16px;
}

.agenda-item h4 a {
  color: var(--text);
  text-decoration: none;
}

.agenda-item h4 a::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 14px;
}

.agenda-item h4 a:hover {
  color: var(--brand);
  text-decoration: none;
}

.agenda-item .by {
  color: var(--muted);
  font-size: 14px;
}

.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
}

.timeline li {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 12px;
  margin-top: 7px;
  margin-bottom: 7px;
  align-items: center;
}

/* People */
.avatar {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  background: #333;
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
  background-size: cover;
  background-position: center;
}

.people {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: all 0.2s ease;
  background: rgba(0, 0, 0, 0.02);
  text-decoration: none;
}

body.force-light .chip {
  background: rgba(0, 0, 0, 0.015);
}

body.force-dark .chip {
  background: rgba(255, 255, 255, 0.02);
}

a.chip {
  cursor: pointer;
}

a.chip:hover {
  border-color: var(--brand);
  background: rgba(110, 231, 255, 0.05);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

body.force-light .chip:hover {
  background: rgba(0, 102, 204, 0.05);
}

a.chip:hover .name {
  color: var(--brand);
}

.chip .name-org {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.3;
}

.chip .name {
  font-weight: 500;
  font-size: 14px;
  color: var(--text);
}

.chip .role {
  color: var(--muted);
  font-size: 11px;
  font-weight: 400;
}

/* Utilities */
.hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.kbd {
  font-family: var(--mono);
  font-size: 12px;
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--muted);
}

.notice {
  background: linear-gradient(180deg, rgba(255, 211, 110, 0.1), transparent), var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
}

/* Session Pages */
.back-link {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 14px;
}

.back-link:hover {
  color: var(--brand);
}

.abstract {
  color: var(--text);
  margin-bottom: 24px;
  line-height: 1.6;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 28px;
  padding-top: 80px; /* Account for fixed theme button */
  min-height: 100vh;
  background: var(--bg);
}

main header {
  margin-bottom: 24px;
}

main h1 {
  font-size: clamp(24px, 4vw, 36px);
  margin: 0 0 16px;
  line-height: 1.2;
}

main h3 {
  margin-top: 0;
}

main section.card {
  margin: 16px 0;
}

/* Footer */
footer {
  color: var(--muted);
  padding: 40px 0 60px;
}

/* Accessibility */
:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

/* Responsive */
@media (max-width: 900px) {
  header.hero {
    grid-template-columns: 1fr;
  }

  .timeline li {
    grid-template-columns: 1fr;
  }

  #themeBtn {
    top: 10px;
    right: 10px;
    padding: 8px 12px;
    font-size: 13px;
  }
}