:root {
  --ink: #1a1614;
  --ink-muted: #5a504a;
  --ink-faint: #9a8f87;
  --paper: #faf8f4;
  --paper-warm: #f3efe8;
  --rule: #d8d0c4;
  --accent: #8b1a1a;
  --accent-light: #f5ece8;
  --mono: 'DM Mono', monospace;
  --serif: 'EB Garamond', Georgia, serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--serif);
  background: var(--paper);
  color: var(--ink);
  font-size: 18px;
  line-height: 1.75;
}

/* ── Header ── */
header {
  border-bottom: 1px solid var(--rule);
  padding: 3rem 0 2rem;
  background: var(--paper);
}

.header-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 2rem;
}

.series-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

header h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 500;
  line-height: 1.15;
  margin-bottom: 0.75rem;
}

.header-meta {
  color: var(--ink-muted);
  font-size: 1rem;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.header-meta span::before {
  content: '· ';
  color: var(--ink-faint);
}

.header-meta span:first-child::before {
  content: '';
}

/* ── Nav ── */
nav {
  background: var(--paper-warm);
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav ul {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 2rem;
  list-style: none;
  display: flex;
}

nav a {
  display: block;
  padding: 0.85rem 1.1rem;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-muted);
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

nav a:hover,
nav a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ── Layout ── */
main {
  max-width: 860px;
  margin: 0 auto;
  padding: 3rem 2rem 6rem;
}

section {
  margin-bottom: 5rem;
  scroll-margin-top: 90px;
}

section h2 {
  font-size: 1.1rem;
  font-family: var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 2rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--rule);
}

/* ── Announcements ── */
.announcement-card {
  border: 1px solid var(--rule);
  border-left: 4px solid var(--ink-muted);
  padding: 1.75rem 2rem;
  background: var(--paper-warm);
  margin-bottom: 3rem;
}

.announcement-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.65rem;
}

.announcement-type {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 2px 8px;
}

.announcement-date {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-faint);
}

.announcement-card h3 {
  font-size: 1.3rem;
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 0.25rem;
}

.announcement-speaker {
  font-style: italic;
  color: var(--ink-muted);
  font-size: 0.95rem;
  margin-bottom: 0.9rem;
}

.announcement-body {
  font-size: 0.97rem;
  color: var(--ink);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.announcement-body a {
  color: var(--accent);
  text-decoration: underline;
}

.announcement-meta {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
  padding-top: 0.75rem;
  border-top: 1px solid var(--rule);
}

/* ── Upcoming ── */
#upcoming {
  margin-top: 2rem;
}

.upcoming-card {
  border: 1px solid var(--rule);
  border-left: 4px solid var(--accent);
  padding: 1.75rem 2rem;
  background: var(--accent-light);
  margin-bottom: 3rem;
}

.upcoming-card .tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.upcoming-card h3 {
  font-size: 1.45rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
  line-height: 1.3;
}

.upcoming-card .speaker {
  color: var(--ink-muted);
  font-style: italic;
  margin-bottom: 0.25rem;
}

.upcoming-card .date-line {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  margin-bottom: 1.2rem;
}

.abstract-box {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 1.25rem 1.5rem;
  margin-top: 1rem;
  font-size: 0.95rem;
}

.abstract-box h4 {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.75rem;
}

/* ── Gallery ── */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 20px;
  align-items: start;
}

.gallery-grid img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  border-radius: 8px;
  display: block;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.gallery-grid img:hover {
  transform: scale(1.03);
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

/* ── Lightbox ── */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.lightbox.active {
  display: flex;
}

.lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 4px;
}

.lightbox-close {
  position: fixed;
  top: 1.5rem;
  right: 2rem;
  font-size: 2rem;
  color: white;
  cursor: pointer;
  line-height: 1;
  font-family: Georgia, serif;
}

/* ── Past Lectures ── */
.empty-note {
  color: var(--ink-faint);
  font-style: italic;
  padding: 2rem 0;
}

.seminar-entry {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 0 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--rule);
}

.seminar-entry:first-of-type {
  border-top: 1px solid var(--rule);
}

.seminar-date {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  padding-top: 0.2rem;
}

.seminar-info h3 {
  font-size: 1.1rem;
  margin-bottom: 0.2rem;
}

.seminar-info .speaker {
  font-style: italic;
  color: var(--ink-muted);
  font-size: 0.95rem;
  margin-bottom: 0.4rem;
}

.topic-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--paper-warm);
  border: 1px solid var(--rule);
  color: var(--ink-muted);
  padding: 2px 8px;
  display: inline-block;
  margin-bottom: 0.6rem;
}

.seminar-info .links a {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  text-decoration: none;
  margin-right: 12px;
  border-bottom: 1px solid transparent;
}

.seminar-info .links a:hover {
  border-bottom-color: var(--accent);
}

/* ── Show More Button ── */
.show-more-btn {
  display: block;
  margin: 1.5rem auto 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: none;
  border: 1px solid var(--rule);
  padding: 0.5rem 1.25rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.show-more-btn:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

/* ── Schedule ── */
.schedule-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.schedule-table th {
  text-align: left;
  padding: 0.6rem 0;
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  color: var(--ink-faint);
  border-bottom: 1px solid var(--rule);
}

.schedule-table td {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--rule);
}

/* ── Status Badges ── */
.status-badge {
  font-family: var(--mono);
  font-size: 10px;
  padding: 3px 8px;
  border: 1px solid;
  border-radius: 3px;
}

.badge-upcoming {
  color: var(--accent);
  border-color: #d4a0a0;
  background: var(--accent-light);
}

.badge-done {
  color: #2d5a27;
  border-color: #a8c8a0;
  background: #f0f7ee;
}

/* ── Organizers ── */
.organizer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.organizer-card {
  border: 1px solid var(--rule);
  padding: 1.4rem;
  background: var(--paper);
  transition: all 0.25s ease;
}

.organizer-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.06);
}

.organizer-card .initials {
  width: 42px;
  height: 42px;
  background: var(--paper-warm);
  border: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 0.9rem;
}

.organizer-card h3 {
  font-size: 1rem;
  margin-bottom: 0.2rem;
}

.organizer-card p {
  font-size: 0.875rem;
  color: var(--ink-muted);
  font-style: italic;
  margin-bottom: 0.3rem;
}

.organizer-card a {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  text-decoration: none;
}

.organizer-card a:hover {
  text-decoration: underline;
}

/* ── Advisor Card ── */
.advisor-card {
  border: 1px solid var(--rule);
  border-left: 4px solid var(--accent);
  padding: 1.5rem;
  background: var(--paper-warm);
  margin-top: 2.5rem;
  max-width: 400px;
}

.advisor-card .initials {
  width: 42px;
  height: 42px;
  background: var(--paper);
  border: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 0.9rem;
}

.advisor-card h3 {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.2rem;
}

.advisor-card p {
  font-size: 0.875rem;
  color: var(--ink-muted);
  font-style: italic;
}

.advisor-sub {
  font-size: 0.8rem;
  color: var(--ink-faint);
  margin-top: 0.2rem;
}

.advisor-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.6rem;
  font-style: normal;
}

/* ── Subscribe Section ── */
.subscribe-section {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
}

.subscribe-text {
  font-size: 0.95rem;
  color: var(--ink-muted);
  margin-bottom: 0.6rem;
}

.subscribe-btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
  border: 1px solid var(--accent);
  padding: 6px 12px;
  transition: all 0.2s ease;
}

.subscribe-btn:hover {
  background: var(--accent);
  color: #fff;
}
.subscribe-row {
  display: flex;
  gap: 2rem;
  margin-top: 1.5rem;
}

.subscribe-row .subscribe-section {
  flex: 1;
  margin-top: 0;
}
.filter-bar {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.filter-btn {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: none;
  border: 1px solid var(--rule);
  color: var(--ink-muted);
  padding: 4px 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-btn:hover,
.filter-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}
/* ── Footer ── */
footer {
  border-top: 1px solid var(--rule);
  padding: 2rem;
  text-align: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
}
/* --- Archive Dropdowns --- */
.archive-schedule {
  margin-top: 2rem;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  overflow: hidden;
}

.archive-schedule summary {
  padding: 1rem;
  background-color: #fafafa;
  font-weight: 500;
  cursor: pointer;
  list-style: none; /* Hides default arrow in some browsers */
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Custom arrow for the dropdown */
.archive-schedule summary::after {
  content: "▼";
  font-size: 0.8rem;
  color: #666;
  transition: transform 0.2s ease;
}

.archive-schedule[open] summary::after {
  transform: rotate(180deg);
}

.archive-schedule[open] summary {
  border-bottom: 1px solid #e0e0e0;
}

/* ── Responsive ── */
@media (max-width: 700px) {
  .organizer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .seminar-entry {
    grid-template-columns: 1fr;
  }

  nav ul {
    overflow-x: auto;
  }

  main {
    padding: 2rem 1.2rem;
  }
}

@media (max-width: 400px) {
  .organizer-grid {
    grid-template-columns: 1fr;
  }
}