/* =========================
   COLOR PALETTE (REFINED)
========================= */
:root {
  --tum-accent: #0b4f8a;     /* muted TUM blue */
  --hertie-accent: #6f1d46;  /* muted burgundy */
  --uh-accent: #a5472a;      /* muted crimson */

  --panel-bg: #fafafa;
  --panel-border: #e3e3e3;
  --module-bg: #ffffff;
  --module-hover: #f2f4f6;
}

/* =========================
   INSTITUTIONS (TOP LEVEL)
========================= */
details.institution {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 0.6rem;
  margin-bottom: 2rem;
}

details.institution summary {
  padding: 0.75rem 1.2rem;
  font-size: 1.15rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  background: transparent;
}

details.institution summary::-webkit-details-marker {
  display: none;
}

/* Accent bars instead of solid fills */
details.institution.tum {
  border-left: 6px solid var(--tum-accent);
}

details.institution.hertie {
  border-left: 6px solid var(--hertie-accent);
}

details.institution.uh {
  border-left: 6px solid var(--uh-accent);
}

/* inner spacing when open */
details.institution > details {
  margin: 1.1rem;
}

/* =========================
   MODULES (SECOND LEVEL)
========================= */
details.module {
  background: var(--module-bg);
  border: 1px solid var(--panel-border);
  border-radius: 0.4rem;
  margin-bottom: 1rem;
  padding: 0.65rem 1rem;
  transition: background 0.15s ease;
}

details.module[open],
details.module:hover {
  background: var(--module-hover);
}

details.module summary {
  cursor: pointer;
  list-style: none;
}

details.module summary::-webkit-details-marker {
  display: none;
}

details.module strong {
  display: block;
  font-size: 1.03rem;
  color: #222;
}

.module-meta {
  font-size: 0.88rem;
  color: #6c757d;
}

/* =========================
   SEMINARS
========================= */
details.module ul {
  margin-top: 0.6rem;
  margin-left: 1.3rem;
}

details.module li {
  margin-bottom: 0.35rem;
}

/* =========================
   FOOTNOTE
========================= */
.teaching-footnote {
  margin-top: 3rem;
  font-size: 0.9rem;
  color: #6c757d;
}