/* Subject page (public/subject.html) — extends styles.css + landing.css +
   course.css (badge/lesson-lock-note tokens are reused as-is), same layering
   posture as course.css's own header comment. */

.subject-page { padding-top: 26px; padding-bottom: 60px; }

.subject-hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.subject-hero h1 { margin: 0; font-size: 1.4rem; color: var(--navy); }
@media (prefers-color-scheme: dark) { .subject-hero h1 { color: var(--gold-light); } }

.exam-toggle { display: flex; gap: 4px; background: var(--navy-pale); border-radius: 999px; padding: 3px; }
.exam-toggle button {
  border: none;
  background: transparent;
  color: var(--navy);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
}
@media (prefers-color-scheme: dark) { .exam-toggle button { color: var(--gold-light); } }
.exam-toggle button[aria-pressed="true"] { background: var(--navy); color: #fff; }
.exam-toggle button:disabled { opacity: 0.4; cursor: not-allowed; }

.subject-detail { min-width: 0; }
.subject-detail h2 { margin: 0 0 4px; font-size: 1.15rem; color: var(--navy); }
@media (prefers-color-scheme: dark) { .subject-detail h2 { color: var(--gold-light); } }

.topic-search {
  width: 100%;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.85rem;
  margin: 10px 0;
  box-sizing: border-box;
  max-width: 320px;
}

/* Loose files — bucket objects sitting directly under Courses/EXAM/Subject/
   with no category/topic beneath them (e.g. a syllabus PDF next to the
   Short Notes/Videos/etc. folders). Free content, shown above the tile
   grid; the whole block is hidden when the current exam has none. */
.subj-loose-files {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.loose-file-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  font-size: 0.86rem;
}
.loose-file-row:last-child { border-bottom: none; }
.loose-file-name { flex: 1; min-width: 0; }
.loose-file-actions { display: flex; gap: 8px; flex: none; }
.loose-file-view,
.loose-file-download { flex: none; font-size: 0.8rem; padding: 5px 12px; }

/* Category tiles — the subject page's primary navigation (one tile per
   Short Notes/Full Length Notes/Videos/Tests/Practice Questions/Solved
   Questions). Selecting a tile filters the topic list below to that
   category. */
.subj-category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
  margin-bottom: 16px;
}

.subj-cat-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  cursor: pointer;
}
.subj-cat-card.selected { border-color: var(--gold); border-width: 2px; }

.subj-cat-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.subj-cat-head h3 { margin: 0; font-size: 0.9rem; }

.subj-cat-body { font-size: 0.83rem; color: var(--text); line-height: 1.5; }
.subj-cat-body ul { margin: 0; padding-left: 18px; }
.subj-cat-body .empty-note { color: var(--text-muted); font-style: italic; }

.subj-cat-card.locked .subj-cat-body { filter: blur(3px); opacity: 0.5; user-select: none; }

/* Topic × file list — rows for the selected category's 30 topics, each with
   its one file (or a count, for qbank categories). */
.subj-topic-file-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.topic-file-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  border-bottom: 1px solid var(--border);
  font-size: 0.86rem;
}
.topic-file-row .num { color: var(--text-muted); font-variant-numeric: tabular-nums; font-size: 0.74rem; width: 22px; flex: none; }
.topic-file-row .topic-file-name { flex: 1; min-width: 0; }
.topic-file-row .topic-file-value { flex: none; text-align: right; }
.topic-file-row .empty-note { color: var(--text-muted); font-style: italic; font-size: 0.82rem; }

.topic-file-link {
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 0.8rem;
  cursor: pointer;
}
.topic-file-link:hover { background: var(--navy-pale); }
.subj-lock-overlay {
  display: none;
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 8px;
  background: rgba(255,255,255,0.02);
}
.subj-cat-card.locked .subj-lock-overlay { display: flex; }

.subj-status { font-size: 0.85rem; color: var(--text-muted); text-align: center; }

/* ---------- Upgrade modal ---------- */
.subj-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(10, 14, 26, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.subj-modal-overlay[hidden] { display: none; }
.subj-modal {
  background: var(--card-bg);
  border-radius: 16px;
  max-width: 440px;
  width: 100%;
  padding: 22px 24px;
  box-shadow: var(--shadow-md);
}
.subj-modal-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.subj-modal-head h2 { margin: 0; font-size: 1.05rem; color: var(--navy); }
@media (prefers-color-scheme: dark) { .subj-modal-head h2 { color: var(--gold-light); } }

.plan-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 480px) { .plan-grid { grid-template-columns: 1fr; } }
.plan-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--bg);
}
.plan-card .plan-name { font-weight: 800; font-size: 0.88rem; }
.plan-card .plan-price { font-size: 1.2rem; font-weight: 800; font-variant-numeric: tabular-nums; }

@media (max-width: 860px) {
  .topic-file-row .topic-file-name { white-space: normal; }
}