/* Course landing page (index.qmd only).
   An aligned index grouped into the course's five modules. Colour carries
   meaning - which module a lecture belongs to, the midterm break, and the lab
   as the graded piece - rather than decorating. Every colour below is at or
   above WCAG AA contrast on both white and its own tint. */

:root {
  --ee-ink:   #1f2328;
  --ee-muted: #6b737c;
  --ee-faint: #7a828b;
  --ee-rule:  #eceff3;
}

/* --- module palette --- */
.m-c    { --mod: #3f6fa8; --mod-tint: #eef4fa; }  /* Embedded C          */
.m-reg  { --mod: #17756b; --mod-tint: #e9f5f3; }  /* Registers and GPIO  */
.m-evt  { --mod: #6a4fb8; --mod-tint: #f0edfa; }  /* Events and time     */
.m-per  { --mod: #9c5a15; --mod-tint: #fdf3e7; }  /* Peripherals         */
.m-proj { --mod: #a53f68; --mod-tint: #fbedf2; }  /* Integration/project */

#title-block-header .title {
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--ee-ink);
}

.lead-note {
  color: #57606a;
  max-width: 46rem;
  font-size: 0.95rem;
  line-height: 1.55;
  margin-bottom: 2.2rem;
}

.lead-note a { color: #27567f; font-weight: 500; }

/* --- module heading --- */
.module-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--mod);
  margin: 1.9rem 0 0.45rem;
}

/* --- the lecture rows --- */
.lec-index { border-top: 2px solid var(--mod); }

.lec-row {
  display: grid;
  grid-template-columns: 3.1rem minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 0 1rem;
  padding: 0.6rem 0.55rem;
  border-bottom: 1px solid var(--ee-rule);
  border-left: 3px solid var(--mod-tint);
  transition: background 0.12s ease, border-left-color 0.12s ease;
}

.lec-row:hover {
  background: var(--mod-tint);
  border-left-color: var(--mod);
}

.lec-main { display: flex; flex-direction: column; gap: 0.12rem; min-width: 0; }

/* the number as a module-coloured chip - the main per-lecture marker */
.lec-code {
  justify-self: start;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--mod);
  background: var(--mod-tint);
  border-radius: 5px;
  padding: 0.16rem 0.4rem;
  font-variant-numeric: tabular-nums;
}

.lec-title {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--ee-ink);
  line-height: 1.35;
  overflow-wrap: anywhere;
}

/* the four core resources, in fixed columns so every row lines up */
.lec-links { display: grid; grid-template-columns: 4rem 5.8rem 5.4rem 3.6rem; }

.lec-links a, .lec-extras a {
  font-size: 0.8rem;
  color: var(--ee-muted) !important;
  text-decoration: none !important;
  border-radius: 5px;
  white-space: nowrap;
  transition: color 0.12s ease, background 0.12s ease;
}

.lec-links a { padding: 0.12rem 0.34rem; margin-left: -0.34rem; }

.lec-links a:hover, .lec-extras a:hover {
  color: var(--mod) !important;
  background: #fff;
}

/* the lab is the graded piece - module colour, so it stands out from its
   three grey siblings without introducing a sixth hue to the page */
.lec-links a:last-child { color: var(--mod) !important; font-weight: 600; }
.lec-links a:last-child:hover { color: var(--mod) !important; background: var(--mod-tint); }

/* extras only three lectures carry */
.lec-extras { display: flex; gap: 0.9rem; }
.lec-extras a {
  font-size: 0.76rem;
  color: var(--ee-faint) !important;
  padding: 0.05rem 0.25rem;
  margin-left: -0.25rem;
}

/* --- the midterm, between the two halves of the term --- */
.midterm-band {
  margin: 2.1rem 0 0.4rem;
  padding: 0.6rem 0.8rem;
  border-left: 3px solid #57606a;
  background: #f2f4f6;
  border-radius: 0 6px 6px 0;
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.03em;
  color: #57606a;
}

/* --- narrow screens: links wrap under the title --- */
@media (max-width: 720px) {
  .lec-row { grid-template-columns: 3rem minmax(0, 1fr); row-gap: 0.35rem; padding: 0.68rem 0.4rem; }
  .lec-links {
    grid-column: 2;
    display: flex;
    flex-wrap: wrap;
    column-gap: 0.85rem;
    row-gap: 0.15rem;
  }
  .lec-links a { padding-left: 0; padding-right: 0; margin-left: 0; }
  .lec-extras { flex-wrap: wrap; gap: 0.85rem; }
  .lec-extras a { margin-left: 0; padding-left: 0; }
}