:root {
  color-scheme: light;
  --paper: #f5f2e9;
  --ink: #222;
  --muted: #626262;
  --rule: #ded8ce;
  --accent: #333;
  --art-inkblue: #344d61;
  --art-ochre: #b68b45;
  --art-oxide: #a35340;
  --metadata-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding-bottom: 4rem;
  min-height: 100vh;
  color: var(--ink);
  background: var(--paper);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

/* Intersections and shared baselines echo the site symbol. */
.background-art {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.background-art svg {
  position: absolute;
}

.art-flow {
  top: 8vh;
  left: calc(50% - 820px);
  width: 600px;
  height: 360px;
}

.art-echo {
  top: 42vh;
  right: calc(50% - 760px);
  width: 420px;
  height: 360px;
}

.flow-line {
  fill: none;
  stroke-width: 1.1;
  stroke-linecap: round;
}

.flow-blue {
  stroke: var(--art-inkblue);
  stroke-opacity: 0.28;
}

.flow-ochre {
  stroke: var(--art-ochre);
  stroke-opacity: 0.4;
}

.flow-trace {
  stroke-dasharray: 2 10;
}

.art-spark {
  fill: var(--art-ochre);
  opacity: 0.65;
}

.flow-point {
  fill: var(--art-oxide);
  opacity: 0.55;
}

.art-ground {
  left: 50%;
  bottom: 0;
  width: 500px;
  height: 360px;
  transform: translateX(-50%);
}

.art-line {
  fill: none;
  stroke: var(--art-inkblue);
  stroke-opacity: 0.35;
  stroke-width: 1.5;
}

.art-overlap {
  fill: var(--art-oxide);
  opacity: 0.12;
}

.art-inkblue {
  stroke: var(--art-inkblue);
  stroke-opacity: 0.75;
}

.art-ochre {
  stroke: var(--art-ochre);
  stroke-opacity: 0.85;
}

.art-oxide {
  stroke: var(--art-oxide);
  stroke-opacity: 0.8;
}

.art-point {
  fill: var(--art-oxide);
}

.page {
  width: calc(100% - 4rem);
  max-width: 920px;
  margin: 4rem auto;
  padding: 2.75rem 3rem 3rem;
  border: 1px solid rgba(124, 107, 89, 0.16);
  border-radius: 12px;
  background: rgba(255, 255, 252, 0.92);
  box-shadow: 0 12px 48px rgba(55, 43, 30, 0.04);
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent);
}

:focus-visible {
  outline: 3px solid #444;
  outline-offset: 5px;
}

.skip-link {
  position: absolute;
  top: 0.75rem;
  left: 1rem;
  z-index: 1;
  padding: 0.5rem 0.8rem;
  transform: translateY(-200%);
  border: 1px solid var(--ink);
  background: #fff;
}

.skip-link:focus {
  transform: translateY(0);
}

.header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 2rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--rule);
}

.header h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 1.15;
}

.site-name {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
}

.site-symbol {
  width: 3rem;
  height: 2.25rem;
  flex-shrink: 0;
  color: var(--muted);
}

.talk-invitation,
.timezone-note {
  margin: 0;
  color: var(--muted);
  font-family: var(--metadata-font);
  font-size: 0.875rem;
  line-height: 1.5;
}

.contact-label {
  color: var(--ink);
  white-space: nowrap;
}

.timezone-note {
  flex-shrink: 0;
  font-size: 0.75rem;
}

main {
  margin-top: 2.5rem;
  overflow-wrap: anywhere;
}

.seminar-section + .seminar-section {
  margin-top: 3.25rem;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin: 0 0 1.5rem;
}

.section-heading h2 {
  margin: 0;
  font-family: var(--metadata-font);
  font-size: 0.8125rem;
  font-weight: 650;
  letter-spacing: 0.1em;
  line-height: 1.5;
  text-transform: uppercase;
}

.section-count {
  margin: 0;
  color: var(--muted);
  font-family: var(--metadata-font);
  font-size: 0.8125rem;
  white-space: nowrap;
}

.seminar-section--upcoming {
  padding: 1.6rem;
  border: 1px solid rgba(182, 139, 69, 0.22);
  border-radius: 12px;
  background: rgba(182, 139, 69, 0.065);
}

.seminar-section--upcoming .event-title {
  font-size: 1.5rem;
}

.seminar-section .event-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.seminar-section--past .section-heading {
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--rule);
}

.seminar-section--past .event-title {
  font-size: 1.25rem;
  font-weight: 700;
}

.seminar-section--past .event-title a {
  text-decoration: none;
}

.seminar-section--past .event-title a:hover,
.seminar-section--past .event-title a:focus-visible {
  text-decoration: underline;
}

.seminar-section--past .event-speaker {
  margin-top: 0.5rem;
  color: var(--muted);
  font-family: var(--metadata-font);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.01em;
}

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

.event-item {
  display: grid;
  grid-template-columns: 11rem minmax(0, 1fr);
  gap: 1.75rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--rule);
}

.event-item + .event-item {
  padding-top: 1.75rem;
}

.event-when {
  padding-top: 0.2rem;
  color: var(--muted);
  font-family: var(--metadata-font);
  font-size: 0.875rem;
  line-height: 1.6;
}

.event-date {
  display: block;
}

.event-time {
  margin: 0.4rem 0 0;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.event-title {
  margin: 0;
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1.35;
}

.event-title a {
  text-decoration-color: #b7b5ad;
}

.event-title a:hover {
  text-decoration-color: var(--accent);
}

.event-speaker {
  margin: 0.65rem 0 0;
  font-size: 1.0625rem;
}

.empty-state,
.loading-state {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

.notice {
  margin: 0 0 1.75rem;
  padding-left: 1rem;
  border-left: 2px solid var(--accent);
  color: var(--muted);
}

.back-link {
  display: inline-block;
  margin-bottom: 2rem;
  font-family: var(--metadata-font);
  font-size: 0.8125rem;
}

.detail-date {
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-family: var(--metadata-font);
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
}

.detail-title {
  margin: 0 0 1rem;
  max-width: 44rem;
  font-size: clamp(1.6rem, 3.5vw, 2.15rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.detail-speaker {
  margin: 0;
  font-size: 1.2rem;
}

.detail-affiliation,
.detail-meta {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-family: var(--metadata-font);
  font-size: 0.875rem;
}

.abstract,
.speaker-bio {
  margin-top: 2.25rem;
}

.rsvp-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.65rem 1.5rem;
  margin-top: 1.75rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.rsvp-block h3 {
  margin: 0;
  font-family: var(--metadata-font);
  font-size: 0.8125rem;
  font-weight: 650;
  letter-spacing: 0.1em;
}

.rsvp-status {
  margin: 0;
  color: var(--muted);
  font-family: var(--metadata-font);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.rsvp-status {
  grid-column: 1 / -1;
}

.rsvp-status:empty {
  display: none;
}

.rsvp-button {
  min-height: 2.75rem;
  padding: 0.65rem 1.1rem;
  border: 1px solid #bcb7ad;
  border-radius: 8px;
  color: var(--ink);
  background: #f5f0e6;
  font: 600 0.9rem var(--metadata-font);
  cursor: pointer;
}

.rsvp-button:hover:not(:disabled) {
  border-color: var(--ink);
  background: #eee6d9;
}

.rsvp-button:disabled {
  color: var(--muted);
  opacity: 0.65;
  cursor: not-allowed;
}

.abstract h3,
.speaker-bio h3 {
  margin: 0 0 0.9rem;
  font-family: var(--metadata-font);
  font-size: 0.8125rem;
  font-weight: 650;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.abstract p,
.speaker-bio p {
  margin: 0;
  max-width: 68ch;
  font-size: 1.125rem;
  line-height: 1.7;
  white-space: pre-line;
}

.abstract p + p,
.speaker-bio p + p {
  margin-top: 1.15em;
}

.speaker-bio p {
  font-size: 1rem;
}

.abstract mjx-container {
  color: #555;
  white-space: normal;
}

.abstract mjx-container[display="true"] {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.35em 0;
}

.food-note {
  margin: 2rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-family: var(--metadata-font);
  font-size: 0.875rem;
}

.error-state h2 {
  margin: 0 0 0.75rem;
  font-size: 1.65rem;
  line-height: 1.3;
}

.error-state p {
  margin: 0;
  max-width: 38rem;
  color: var(--muted);
}

.page-actions {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 2;
  display: flex;
  gap: 0.6rem;
}

.page-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 3.5rem;
  min-height: 2.75rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid #bcb7ad;
  border-radius: 8px;
  background: rgba(255, 255, 252, 0.97);
  box-shadow: 2px 2px 0 #d6d2c9;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
}

.page-action[hidden],
.page-actions[hidden] {
  display: none;
}

.page-action:hover {
  border-color: var(--accent);
  background: #f5f0e6;
}

@media (max-width: 720px) {
  .art-flow {
    top: 4rem;
    left: -420px;
    opacity: 0.6;
  }

  .art-echo {
    top: 45vh;
    right: -270px;
    opacity: 0.55;
  }

  .page-actions {
    right: 1rem;
    bottom: 1rem;
  }

  .art-ground {
    opacity: 0.65;
  }

  .page {
    width: calc(100% - 2rem);
    margin: 1.5rem auto;
    padding: 1.75rem;
    background: rgba(255, 255, 252, 0.94);
  }

  .header h1 {
    font-size: clamp(1.65rem, 5.8vw, 2.15rem);
  }

  .site-name {
    gap: 0.5rem;
  }

  .site-symbol {
    width: 2.25rem;
    height: 1.7rem;
  }

  .header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.85rem;
    padding-bottom: 1.5rem;
  }

  main {
    margin-top: 2rem;
  }

  .event-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.85rem;
  }

  .event-time {
    margin-top: 0.1rem;
  }

  .event-title {
    font-size: 1.25rem;
  }

  .seminar-section--upcoming {
    padding: 1rem;
  }

  .seminar-section--upcoming .event-title {
    font-size: 1.25rem;
  }

  .rsvp-block {
    grid-template-columns: minmax(0, 1fr);
  }

  .rsvp-button {
    justify-self: start;
  }
}