/* =========================================================
   Teaching page. Loaded only by teaching.html, on top of style.css.
   ========================================================= */

/* Contents list at the top */
.course-index {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1.5rem 3rem;
  max-width: 48rem; margin: 2.5rem 0 1rem;
  font-family: var(--sans); font-size: 0.95rem;
}
.course-index__label { font-weight: 500; color: var(--muted); margin: 0 0 0.5rem; }
.course-index ul { list-style: none; margin: 0; padding: 0; }
.course-index li { padding: 0.2rem 0; }
.course-index .term { color: var(--muted); }

/* Group headings: "This semester", "Previous courses" */
.course-group { margin: clamp(3rem, 6vw, 4.5rem) 0 0; }
.course-group > h2 { margin-bottom: 0.5rem; }

/* One course = one collapsible block */
.course { border-top: 1px solid var(--rule); }
.course:last-child { border-bottom: 1px solid var(--rule); }
.course > summary {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 1.5rem;
  padding: 1.4rem 0;
  cursor: pointer;
  list-style: none;
}
.course > summary::-webkit-details-marker { display: none; }
.course > summary:hover h3 { color: var(--accent); }
.course h3 { font-size: clamp(1.35rem, 1.2rem + 0.6vw, 1.7rem); margin: 0 0 0.25rem; }
.course__term {
  font-family: var(--sans); font-size: 0.9rem; color: var(--muted); margin: 0;
  font-variant-numeric: lining-nums;
}
/* open/closed chevron */
.course > summary::after {
  content: "";
  width: 0.6rem; height: 0.6rem; margin: 0 0.4rem 0.3rem;
  border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 0.15s ease;
}
.course[open] > summary::after { transform: rotate(-135deg); margin-bottom: -0.2rem; }
@media (prefers-reduced-motion: reduce) { .course > summary::after { transition: none; } }

.course__body { padding: 0 0 2.5rem; }
.course__body > p { max-width: var(--measure); }

/* Facts: lecturer, role, time and place, course page */
.course__facts {
  display: grid; grid-template-columns: 9rem minmax(0, 1fr); gap: 0.35rem 1.5rem;
  max-width: 44rem; margin: 0 0 1.5rem;
  font-family: var(--sans); font-size: 0.95rem; line-height: 1.5;
}
.course__facts dt { color: var(--muted); }
.course__facts dd { margin: 0; }
@media (max-width: 36rem) {
  .course__facts { grid-template-columns: 1fr; gap: 0; }
  .course__facts dd { margin-bottom: 0.6rem; }
}

.course h4 {
  font-family: var(--sans); font-size: 0.95rem; font-weight: 500;
  margin: 2rem 0 0.75rem;
}

/* Files that belong to the whole course */
.file-list {
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.75rem;
  list-style: none; margin: 0; padding: 0;
  font-family: var(--sans); font-size: 0.95rem;
}
.filetype { color: var(--muted); font-size: 0.8rem; margin-left: 0.25rem; }

/* Week-by-week material */
.materials-wrap { overflow-x: auto; }
.materials {
  width: 100%; max-width: 56rem; border-collapse: collapse;
  font-size: 1.0625rem; line-height: 1.45;
}
.materials th {
  font-family: var(--sans); font-size: 0.85rem; font-weight: 500; color: var(--muted);
  text-align: left; padding: 0 1rem 0.5rem 0; border-bottom: 1px solid var(--rule);
}
.materials td { padding: 0.85rem 1rem 0.85rem 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.materials .num, .materials .date {
  font-family: var(--sans); font-size: 0.9rem; color: var(--muted);
  font-variant-numeric: lining-nums tabular-nums; white-space: nowrap;
}
.materials .num { width: 2.5rem; }
.materials .files { display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem; font-family: var(--sans); font-size: 0.95rem; }
.pending { color: var(--muted); }

/* Phones: each week becomes a small block instead of a table row */
@media (max-width: 40rem) {
  .materials, .materials tbody { display: block; }
  .materials thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  .materials tr {
    display: grid; grid-template-columns: 2.25rem minmax(0, 1fr); gap: 0.2rem 0;
    padding: 0.9rem 0; border-bottom: 1px solid var(--rule);
  }
  .materials td { padding: 0; border: 0; }
  .materials .num { grid-row: 1 / span 3; padding-top: 0.1rem; }
  .materials .files { margin-top: 0.3rem; }
}