.seminar-hero {
  background: linear-gradient(160deg, #eff6ff 0%, #f8fafc 60%);
  padding: 48px 0;
}

.seminar-hero h1 {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 800;
  color: #0f172a;
  margin: 0 0 8px;
}

.seminar-hero p {
  font-size: 16px;
  color: #475569;
  margin: 0;
}

.seminar-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.seminar-card {
  background: #fff;
  border-radius: 14px;
  border: 1.5px solid #e2e8f0;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  transition: all 0.2s;
  height: 100%;
}

.seminar-card:hover {
  border-color: #93c5fd;
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.08);
  transform: translateY(-2px);
}

.seminar-card h2 {
  font-size: 17px;
  font-weight: 700;
  margin: 0;
  line-height: 1.35;
}

.seminar-card h2 a {
  color: #0f172a;
  text-decoration: none;
}

.seminar-card h2 a::after {
  content: '';
  position: absolute;
  inset: 0;
}

.seminar-card-summary {
  font-size: 14px;
  color: #64748b;
  line-height: 1.6;
  flex: 1;
  margin: 0;
}

.seminar-card-meta {
  font-size: 12px;
  color: #94a3b8;
  margin: 0;
}

.seminars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.seminar-detail-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 36px;
  align-items: start;
  padding: 40px 0 80px;
}

.seminar-detail-main h1 {
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 800;
  color: #0f172a;
  margin: 0 0 12px;
}

.seminar-detail-lead {
  font-size: 18px;
  color: #475569;
  line-height: 1.6;
  margin: 20px 0 0;
}

.seminar-detail-body {
  font-size: 16px;
  color: #334155;
  line-height: 1.75;
  margin-top: 20px;
}

.seminar-panel {
  background: #fff;
  border-radius: 14px;
  border: 1.5px solid #e2e8f0;
  padding: 22px;
  margin-top: 24px;
}

.seminar-panel h2 {
  font-size: 14px;
  font-weight: 700;
  color: #0f172a;
  margin: 0 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.seminar-panel.online {
  background: #f0f9ff;
  border-color: #bae6fd;
}

.seminar-register-card {
  background: #fff;
  border-radius: 14px;
  border: 1.5px solid #e2e8f0;
  padding: 24px;
  position: sticky;
  top: 88px;
}

.seminar-register-card h2 {
  font-size: 14px;
  font-weight: 700;
  margin: 0 0 16px;
  color: #0f172a;
}

.btn-block {
  display: flex;
  width: 100%;
  justify-content: center;
  text-align: center;
}

.btn-danger-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  gap: 8px;
  background: #fff;
  color: #dc2626;
  font-weight: 600;
  font-size: 14px;
  padding: 11px 18px;
  border-radius: 10px;
  border: 1.5px solid #fecaca;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-danger-outline:hover {
  background: #fef2f2;
}

.status-banner {
  font-size: 14px;
  padding: 10px 14px;
  border-radius: 10px;
  margin-bottom: 12px;
}

.status-banner.success {
  background: #dcfce7;
  color: #166534;
}

.status-banner.warning {
  background: #fef3c7;
  color: #92400e;
}

.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: #64748b;
  background: #fff;
  border-radius: 14px;
  border: 1.5px solid #e2e8f0;
}

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

  .seminar-register-card {
    position: static;
  }
}