/* ══════════════════════════════════════════════════════
   Exam Prep — Shared Styles
   Used by quantum/exam/*.html pages
   Depends on study.css variables
   ══════════════════════════════════════════════════════ */

/* ── Collapsible solutions ── */
details.solution {
  background: var(--bg-subtle);
  border: none;
  border-radius: 3px;
  padding: 0;
  margin-bottom: 1rem;
}
details.solution summary {
  padding: 0.7rem 1rem;
  cursor: pointer;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--info);
  user-select: none;
  list-style: none;
}
details.solution summary::before {
  content: '\25B6  ';
  font-size: 0.7rem;
  display: inline-block;
  margin-right: 0.3rem;
  transition: transform 0.15s;
}
details.solution[open] summary::before {
  content: '\25BC  ';
}
details.solution summary::-webkit-details-marker { display: none; }
details.solution .solution-body {
  padding: 0.8rem 1rem 1rem;
  border-top: 1px solid var(--border);
  background: var(--info-light);
  border-radius: 0 0 3px 3px;
}
details.solution .solution-body p:last-child { margin-bottom: 0; }

/* ── Practice problem boxes ── */
.problem {
  background: var(--bg-subtle);
  border: none;
  border-radius: 3px;
  padding: 1rem 1.2rem;
  margin-bottom: 0.5rem;
}
.problem p:last-child { margin-bottom: 0; }
.problem-num {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--quantum);
  margin-bottom: 0.4rem;
}

/* ── Step labels in worked examples ── */
.step-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--info);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.2rem;
}

/* ── Key formula highlight ── */
.key-formula {
  background: var(--quantum-light);
  border-left: 3px solid var(--quantum);
  border-radius: 0 3px 3px 0;
  padding: 0.8rem 1rem;
  margin: 1rem 0;
}
.key-formula p:last-child { margin-bottom: 0; }

/* ── Lookup table (styled for mechanics) ── */
.lookup-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 0.8rem 0 1rem;
}
.lookup-table th {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--neutral);
  text-align: left;
  padding: 0.4rem 0.6rem;
  border-bottom: 2px solid var(--border);
}
.lookup-table td {
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.lookup-table tr:last-child td { border-bottom: none; }

/* ── Exam tag pills ── */
.exam-tag {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  margin-right: 0.3rem;
}
.exam-tag.core {
  background: var(--good-light);
  color: var(--good);
}
.exam-tag.rotating {
  background: var(--warn-light);
  color: var(--warn);
}
.exam-tag.new {
  background: var(--urgent-light);
  color: var(--urgent);
}

/* ── Status indicators ── */
.status-ready { color: var(--good); }
.status-wip { color: var(--warn); }
.status-todo { color: var(--neutral); }

/* ── Exam index grid ── */
.exam-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.8rem;
  margin: 1rem 0;
}
.exam-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.2rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.exam-card:hover {
  border-color: var(--quantum);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  text-decoration: none;
}
.exam-card-title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.3rem;
}
.exam-card-meta {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  color: var(--neutral);
}
.exam-card-status {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  margin-top: 0.4rem;
}

/* ── Boxed answer ── */
.answer-box {
  background: var(--good-light);
  border: 1px solid var(--good);
  border-radius: 3px;
  padding: 0.6rem 1rem;
  margin: 0.5rem 0;
  text-align: center;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .exam-grid { grid-template-columns: 1fr; }
  .problem { padding: 0.8rem; }
}