:root{
  --bg: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --card: #f8fafc;
  --accent: #2563eb;
  --accent-2: #16a34a;
}

*{ box-sizing:border-box; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

.container{
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header{
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 1rem;
  padding: .75rem 0;
}

.brand{
text-decoration:none;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--text);
  font-size: 1.05rem;
}

.nav-list{
  list-style:none;
  display:flex;
  gap:.25rem;
  padding:0;
  margin:0;
  align-items:center;
  flex-wrap:wrap;
}

.nav-item a, .dropdown-toggle{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.45rem .6rem;
  border-radius: 999px;
  text-decoration:none;
  color: var(--muted);
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  font: inherit;
}

.nav-item a:hover, .dropdown-toggle:hover{
  background: var(--card);
  color: var(--text);
}

.nav-item a.active{
  color: var(--text);
  border-color: var(--border);
  background: var(--card);
}

.dropdown{
  position: relative;
}

.dropdown-menu{
  display:none;
  position:absolute;
  right:0;
  top: calc(100% + .5rem);
  min-width: 220px;
  padding:.5rem;
  margin:0;
  list-style:none;
  background:#fff;
  border:1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(2,6,23,.08);
}

.dropdown-menu.open{ display:block; }

.dropdown-menu a{
  display:block;
  padding:.55rem .65rem;
  border-radius: 10px;
  color: var(--text);
  text-decoration:none;
}

.dropdown-menu a:hover{
  background: var(--card);
}

main.container{
  padding: 2rem 0 3rem;
}

h1{ font-size: 2.2rem; line-height:1.15; margin: 0 0 1rem; letter-spacing:-.03em; }
h2{ margin-top: 2rem; }
p{ color: var(--muted); font-size: 1.05rem; }

.hero{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 1.25rem;
  align-items: start;
  margin-top: .5rem;
}

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

.hero-card{
  border:1px solid var(--border);
  background: linear-gradient(180deg, #ffffff, #f8fafc);
  border-radius: 18px;
  padding: 1.25rem;
}

.badges{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem;
  margin: .75rem 0 0;
}

.badge{
  font-size: .85rem;
  color: var(--text);
  border: 1px solid var(--border);
  background: #fff;
  padding: .25rem .5rem;
  border-radius: 999px;
}

.cta-row{
  display:flex;
  flex-wrap:wrap;
  gap:.6rem;
  margin-top: 1rem;
}

.btn{
  display:inline-flex;
  gap:.4rem;
  align-items:center;
  text-decoration:none;
  padding:.55rem .75rem;
  border-radius: 12px;
  border:1px solid var(--border);
  color: var(--text);
  background:#fff;
  font-weight: 600;
}

.btn.primary{
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn.secondary{
  background: #ecfeff;
  border-color: #a5f3fc;
  color: #0f172a;
}

.grid{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1.25rem;
}

@media (max-width: 900px){
  .grid{ grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px){
  .grid{ grid-template-columns: 1fr; }
}

.card{
  border:1px solid var(--border);
  background: var(--card);
  border-radius: 18px;
  padding: 1rem;
  min-height: 150px;
}

.card h3{
  margin: .2rem 0 .4rem;
  font-size: 1.05rem;
}

.card p{
  margin: 0;
  font-size: .98rem;
}

.card a{
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
}

.section-title{
  margin-top: 2.25rem;
  font-size: 1.35rem;
  color: var(--text);
}

hr{
  border:0;
  border-top:1px solid var(--border);
  margin: 2rem 0;
}

.small{ color: var(--muted); font-size: .9rem; }

.site-footer{
  border-top: 1px solid var(--border);
  padding: 1.2rem 0;
  background: #fff;
}

/* Resource Cards */
.resource-card {
  border: 1px solid var(--border);
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.resource-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.12);
  border-color: var(--accent);
}

.resource-card h3 {
  margin: 0 0 0.75rem 0;
  font-size: 1.15rem;
  line-height: 1.4;
}

.resource-card h3 a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s ease;
}

.resource-card h3 a:hover {
  color: var(--accent);
}

.resource-card p {
  margin: 0 0 0.75rem 0;
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.6;
}

.resource-card .badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid rgba(37, 99, 235, 0.2);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  margin-top: 0.5rem;
}

/* Organizers Page */
.organizers-page h1 {
  margin-bottom: 0.5rem;
}

.organizers-page > p {
  color: var(--muted);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.organizer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
  margin-bottom: 3rem;
}

.organizer-card {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 16px;
  padding: 1.5rem;
  text-align: center;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.organizer-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.12);
  border-color: var(--accent);
}

.organizer-image {
  width: 140px;
  height: 140px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--border);
  background: linear-gradient(135deg, #e0e7ff 0%, #dbeafe 100%);
}

.organizer-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.organizer-info h3 {
  margin: 0 0 0.4rem;
  font-size: 1.1rem;
  color: var(--text);
  font-weight: 600;
}

.organizer-info h3 a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s ease;
}

.organizer-info h3 a:hover {
  color: var(--accent);
}

.organizer-info .affiliation {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

@media (max-width: 768px) {
  .organizer-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
  }
  
  .organizer-image {
    width: 120px;
    height: 120px;
  }
}

@media (max-width: 520px) {
  .organizer-grid {
    grid-template-columns: 1fr;
  }
}

/* Seminar Series Page */
.seminar-page h1 {
  margin-bottom: 0.5rem;
}

.seminar-page > p {
  color: var(--muted);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.seminar-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.info-card {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 14px;
  padding: 1.25rem;
}

.info-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  color: var(--text);
}

.info-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
}

.info-card ul {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.info-card ul li {
  margin: 0.25rem 0;
}

.text-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.text-link:hover {
  text-decoration: underline;
}

.seminar-calendar, .past-seminars {
  margin: 1.5rem 0 2rem;
  overflow-x: auto;
}

.seminar-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}

.seminar-table thead {
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

.seminar-table th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  color: var(--text);
  font-size: 0.9rem;
  border-bottom: 2px solid var(--border);
}

.seminar-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-size: 0.95rem;
}

.seminar-table tbody tr:last-child td {
  border-bottom: none;
}

.seminar-table tbody tr:hover {
  background: var(--card);
}

.seminar-table tr.expandable-row {
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.seminar-table tr.expandable-row:hover {
  background: #f1f5f9;
}

.expand-indicator {
  display: inline-block;
  margin-left: 0.5rem;
  font-size: 0.75rem;
  color: var(--accent);
  transition: transform 0.2s ease;
}

.seminar-table tr.details-row {
  background: #fefce8;
  border-left: 4px solid var(--accent);
}

.seminar-table tr.details-row td {
  padding: 2rem;
}

.seminar-details {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2rem;
  align-items: start;
}

.speaker-photo {
  width: 200px;
  height: 250px;
  border-radius: 12px;
  overflow: hidden;
  border: 3px solid var(--border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.speaker-photo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #f8fafc;
}

.seminar-content h3 {
  margin: 0 0 1.5rem;
  font-size: 1.3rem;
  color: var(--text);
  line-height: 1.3;
}

.seminar-content h4 {
  margin: 1.5rem 0 0.75rem;
  font-size: 1.05rem;
  color: var(--accent);
  font-weight: 600;
}

.seminar-content p {
  margin: 0 0 1rem;
  color: var(--text);
  line-height: 1.7;
  font-size: 0.95rem;
}

.seminar-content p:last-child {
  margin-bottom: 0;
}

@media (max-width: 900px) {
  .seminar-details {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .speaker-photo {
    width: 150px;
    height: 188px;
    margin: 0 auto;
  }
}

.seminar-table tr.no-data td {
  text-align: center;
  color: var(--muted);
  font-style: italic;
  padding: 2rem;
}

.btn-small {
  display: inline-block;
  padding: 0.4rem 0.75rem;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

.btn-small:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
}

.status-pending {
  display: inline-block;
  padding: 0.4rem 0.75rem;
  background: #fef3c7;
  color: #92400e;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
}

.calendar-note, .recordings-note {
  margin: 1rem 0 2rem;
  padding: 1rem;
  background: #fffbeb;
  border: 1px solid #fef3c7;
  border-radius: 12px;
}

.calendar-note p, .recordings-note p {
  margin: 0;
  font-size: 0.9rem;
  color: #92400e;
}

@media (max-width: 768px) {
  .seminar-table {
    font-size: 0.85rem;
  }
  
  .seminar-table th,
  .seminar-table td {
    padding: 0.75rem 0.5rem;
  }
}

@media (max-width: 600px) {
  .seminar-info-grid {
    grid-template-columns: 1fr;
  }
}