/* ==========================================================================
   Merit Study Resources — subjects page
   Loaded after style.css and resources.css; reuses their tokens and shell.
   ========================================================================== */

/* 1. Page header controls ----------------------------------------------- */
.subjects-header { padding-bottom: 1.5rem; }

.subject-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}
.subject-search { flex: 1 1 22rem; max-width: 26rem; }
.qual-filter {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  padding: .3rem;
  background: #f4f7f5;
  border: 1px solid var(--merit-line);
  border-radius: var(--radius-pill);
}

.result-count {
  margin: 1rem 0 0;
  font-size: .87rem;
  color: var(--merit-muted);
}

/* 2. Category jump bar --------------------------------------------------- */
.jump-bar {
  position: sticky;
  top: 0;
  z-index: 1020;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid var(--card-border);
}
.jump-list {
  display: flex;
  gap: .4rem;
  margin: 0;
  padding: .65rem 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.jump-list::-webkit-scrollbar { display: none; }
.jump-chip {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .4rem .85rem;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-pill);
  background: #fff;
  color: var(--merit-text);
  font-size: .85rem;
  font-weight: 600;
  white-space: nowrap;
  transition: border-color var(--ease), color var(--ease), background var(--ease);
}
.jump-chip:hover {
  background: var(--merit-light-green);
  border-color: #cfe5d8;
  color: var(--merit-dark-green);
  text-decoration: none;
}
.jump-count {
  font-size: .75rem;
  font-weight: 500;
  color: var(--merit-muted);
}

/* 3. Subject groups ------------------------------------------------------ */
.subject-body { padding: 2rem 0 3rem; }

.subject-group { scroll-margin-top: 4.5rem; }
.subject-group + .subject-group { margin-top: 2.5rem; }
.subject-group[hidden] { display: none; }

.group-head {
  display: flex;
  align-items: baseline;
  gap: .85rem;
  padding-bottom: .75rem;
  margin-bottom: 1.1rem;
  border-bottom: 1px solid var(--card-border);
}
.group-heading {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -.02em;
  margin: 0;
}
.group-count { font-size: .82rem; color: var(--merit-muted); }

/* 4. Subject tiles ------------------------------------------------------- */
.subject-tile {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: .9rem;
  height: 100%;
  padding: 1.05rem 2.4rem 1.05rem 1.05rem;
  background: #fff;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  color: var(--merit-navy);
  transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease);
}
.subject-tile:hover,
.subject-tile:focus-visible {
  transform: translateY(-2px);
  border-color: #cfdcd4;
  box-shadow: var(--shadow-sm);
  color: var(--merit-navy);
  text-decoration: none;
}
.subject-tile[hidden] { display: none; }

.tile-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  flex: none;
  border-radius: 11px;
  font-size: 1.25rem;
  transition: transform var(--ease);
}
.subject-tile:hover .tile-icon { transform: scale(1.06); }
.tile-icon.tint-mint { color: var(--ink-teal); }
.tile-icon.tint-blush { color: var(--ink-rose); }
.tile-icon.tint-sage { color: var(--merit-green); }
.tile-icon.tint-cream { color: var(--ink-amber); }
.tile-icon.tint-sky { color: var(--ink-blue); }
.tile-icon.tint-lilac { color: var(--ink-purple); }
.tile-icon.tint-periwinkle { color: var(--merit-navy); }

.tile-body { display: block; min-width: 0; }
.tile-name {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -.015em;
  margin-bottom: .15rem;
}
.tile-meta {
  display: block;
  font-size: .8rem;
  color: var(--merit-muted);
  margin-bottom: .55rem;
}
.tile-quals { display: flex; flex-wrap: wrap; gap: .3rem; }
.qual-chip {
  display: inline-block;
  padding: .12rem .5rem;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-pill);
  background: #fbfdfb;
  font-size: .72rem;
  font-weight: 600;
  color: var(--merit-muted);
}

.tile-go {
  position: absolute;
  right: 1rem;
  top: 1.15rem;
  color: var(--merit-green);
  font-size: .85rem;
  transition: transform var(--ease);
}
.subject-tile:hover .tile-go { transform: translateX(3px); }

/* 5. Request panel ------------------------------------------------------- */
.request-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
  padding: 1.5rem;
  background: var(--merit-light-green);
  border: 1px solid #d9e9df;
  border-radius: var(--radius-lg);
}
.request-heading { font-size: 1.1rem; font-weight: 700; margin: 0 0 .3rem; }
.request-text { margin: 0; font-size: .92rem; color: #4a5f70; max-width: 40rem; }
.request-panel .btn-merit {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  min-height: 46px;
  padding-inline: 1.4rem;
}

/* 6. Responsive ---------------------------------------------------------- */
@media (max-width: 991.98px) {
  .jump-bar { position: static; }
  .subject-group { scroll-margin-top: 1rem; }
}

@media (max-width: 767.98px) {
  .subject-controls { flex-direction: column; align-items: stretch; }
  .subject-search { max-width: none; }
  .qual-filter { justify-content: space-between; }
  .qual-filter .filter-pill { flex: 1 1 auto; }
  .request-panel { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 575.98px) {
  .tile-meta { display: none; }
  .subject-tile { padding-right: 2.2rem; }
}