:root {
  --sidebar-border: #dbd9e2;
  --sidebar-text: #56525f;
  --sidebar-accent: #1c6b42;
  --sidebar-hover: #eef6f0;
  --page-bg: #fbfbfd;
  --panel-bg: #fbfbfd;
  --sidebar-bg: #f6f5f9;
  --sidebar-divider: rgba(15, 23, 42, 0.05);
  --content-muted: #56525f;
  --content-subtle: #666666;
  --seminar-footer-gap: clamp(10rem, 20vh, 15rem);
}

body.seminar-page {
  min-height: 100vh;
  background: var(--page-bg);
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.seminar-page .navbar .nav-link.is-active {
  color: var(--sidebar-accent);
}

.seminar-page .seminar-sidebar,
.seminar-page .seminar-shell,
.seminar-page .seminar-content,
.seminar-page .seminar-detail,
.seminar-page .season-toggle,
.seminar-page .season-link,
.seminar-page .seminar-summary,
.seminar-page .seminar-video,
.seminar-page .seminar-meta,
.seminar-page .back-link {
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="dark"] {
  --sidebar-border: #373d37;
  --sidebar-text: #d0d8d2;
  --sidebar-accent: #73b892;
  --sidebar-hover: #1b201c;
  --page-bg: #101210;
  --panel-bg: #151815;
  --sidebar-bg: #131512;
  --sidebar-divider: rgba(255, 255, 255, 0.06);
  --content-muted: #d0d8d2;
  --content-subtle: #99a39b;
}

[data-theme="dark"] .season-toggle,
[data-theme="dark"] .season-toggle span:first-child,
[data-theme="dark"] .season-icon {
  color: var(--sidebar-accent) !important;
}

[data-theme="dark"] .season-link.is-current {
  color: var(--sidebar-accent);
}

.seminar-shell {
  display: grid;
  grid-template-columns: minmax(220px, 310px) 1fr;
  margin-top: 80px;
  min-height: calc(100vh - 80px + var(--seminar-footer-gap));
}

.seminar-sidebar {
  border-right: 1px solid var(--sidebar-divider);
  background: var(--sidebar-bg);
}

.seminar-sidebar-header {
  padding: 1.5rem 1.5rem 1rem;
  border-bottom: 1px solid var(--sidebar-border);
}

.seminar-sidebar-header h1 {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.season-list {
  padding: 0;
  margin: 0;
}

.season {
  border-bottom: 1px solid var(--sidebar-border);
}

.season-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  border: 0;
  background: transparent;
  font: inherit;
  color: var(--sidebar-accent);
  cursor: pointer;
}

.season-toggle span:first-child {
  font-size: 1.02rem;
  font-weight: 700;
}

.season-icon {
  --icon-rotation: 0deg;
  width: 1.4rem;
  height: 1.4rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--sidebar-accent);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1;
  flex-shrink: 0;
  transform: rotate(var(--icon-rotation));
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.season-toggle[aria-expanded="false"] .season-icon {
  --icon-rotation: 180deg;
}

.season-toggle:hover .season-icon {
  opacity: 0.7;
}

.season-items {
  list-style: none;
  margin: 0;
  padding: 0 0 1rem;
}

.season-item {
  display: block;
  margin: 0;
}

.season-link {
  display: block;
  padding: 0.55rem 1.25rem 0.55rem 1.5rem;
  color: var(--sidebar-text);
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.45;
  text-decoration: none;
}

.season-link.is-current,
.season-link:hover {
  background: var(--sidebar-hover);
}

.season-link.is-current {
  font-weight: 700;
}

@media (max-width: 900px) {
  .seminar-shell {
    grid-template-columns: 1fr;
    min-height: calc(100vh - 80px);
  }

  .seminar-sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--sidebar-border);
  }

  .seminar-sidebar-header {
    padding: 1rem 0.9rem;
  }

  .seminar-sidebar-header h1 {
    font-size: 0.94rem;
    letter-spacing: 0.03em;
  }

  .season-toggle {
    padding: 1rem 0.9rem;
  }

  .season-toggle span:first-child {
    font-size: 0.98rem;
  }

  .season-icon {
    display: inline-flex;
    width: 2.2rem;
    height: 2.2rem;
    font-size: 0.92rem;
  }

  .season-items {
    padding-bottom: 0.7rem;
  }

  .season-link {
    padding: 0.5rem 0.9rem;
    font-size: 0.9rem;
  }
}