/* ═══════════════════════════════════════════════
   ExamZEN — Practice Page Styles v3
═══════════════════════════════════════════════ */

/* ── LAYOUT ──────────────────────────────────── */
body.practice-page { overflow: hidden; height: 100vh; }

.practice-main {
  margin-left: var(--sidebar-w);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── TOOLBAR ─────────────────────────────────── */
.practice-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
  padding: 0 18px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 16px;
}

.subject-tabs { display: flex; gap: 2px; }

.stab {
  padding: 5px 14px;
  border-radius: var(--r);
  border: none;
  background: none;
  font-family: var(--font);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-dim);
  cursor: pointer;
  transition: background var(--t), color var(--t);
}
.stab:hover  { background: var(--surface); color: var(--text-sub); }
.stab.active { background: var(--surface); color: var(--text); font-weight: 600; }

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

/* ── PER-QUESTION TIMER ──────────────────────── */
.toolbar-timer {
  font-size: 0.78rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  padding: 3px 9px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  transition: color var(--t), border-color var(--t);
  min-width: 54px;
  text-align: center;
  cursor: default;
}
.toolbar-timer.timer-fast   { color: var(--green);  border-color: var(--green-border); }
.toolbar-timer.timer-normal { color: var(--yellow); border-color: var(--yellow-border); }
.toolbar-timer.timer-slow   { color: var(--red);    border-color: var(--red-border); }

/* ── SCORE BAR ───────────────────────────────── */
.toolbar-score { display: flex; align-items: center; gap: 10px; }

.score-item { font-size: 0.78rem; color: var(--text-dim); }
.score-correct b { color: var(--green); }
.score-wrong   b { color: var(--red); }
.score-total   b { color: var(--text-sub); }

/* ── FILTER BAR ──────────────────────────────── */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 18px;
  height: 42px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.filter-bar::-webkit-scrollbar { display: none; }

.filter-breadcrumb {
  display: flex;
  align-items: center;
  gap: 7px;
  flex-shrink: 0;
  min-width: 0;
  max-width: 320px;
  overflow: hidden;
}

.filter-subject-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-sub);
  white-space: nowrap;
}

.filter-sep {
  font-size: 0.75rem;
  color: var(--text-dim);
  flex-shrink: 0;
}

.filter-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  white-space: nowrap;
}

/* Chapter pill — removable tag */
.chapter-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px 3px 10px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  border-radius: 20px;
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--accent);
  max-width: 230px;
}

.chapter-pill-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chapter-pill-x {
  cursor: pointer;
  flex-shrink: 0;
  font-size: 1rem;
  line-height: 1;
  opacity: 0.6;
  transition: opacity var(--t);
}
.chapter-pill-x:hover { opacity: 1; }

/* Quick filter selects */
.filter-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
  flex-shrink: 0;
}

.filter-select {
  height: 28px;
  padding: 0 8px;
  font-size: 0.74rem;
  border-radius: var(--r-sm);
  width: auto;
  min-width: 82px;
}

.sort-btn {
  height: 28px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--surface);
  color: var(--text-dim);
  font-size: 0.73rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t);
  white-space: nowrap;
  font-family: var(--font);
}
.sort-btn:hover { border-color: var(--border-2); color: var(--text-sub); }
.sort-btn.sort-asc { color: var(--accent); border-color: var(--accent-border); }

.filter-reset-btn {
  height: 28px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: none;
  color: var(--text-dim);
  font-size: 0.72rem;
  cursor: pointer;
  transition: all var(--t);
  font-family: var(--font);
}
.filter-reset-btn:hover { color: var(--red); border-color: var(--red-border); }

/* ── PRACTICE BODY ───────────────────────────── */
.practice-body {
  display: flex;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

/* ── QUESTION AREA ───────────────────────────── */
.question-area {
  flex: 1;
  overflow-y: auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* ── NAV BAR ─────────────────────────────────── */
.q-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 24px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.nav-btn {
  padding: 6px 16px;
  border-radius: var(--r);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  font-family: var(--font);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--t);
}
.nav-btn:hover:not(:disabled) { border-color: var(--border-2); color: var(--text); background: var(--hover); }
.nav-btn:disabled { opacity: 0.3; cursor: not-allowed; }

.q-counter {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-sub);
}

/* ── STATE CARDS ─────────────────────────────── */
.state-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 64px 24px;
  text-align: center;
  gap: 6px;
}
.state-card h3 { font-size: 0.95rem; font-weight: 600; color: var(--text); }
.state-card p  { font-size: 0.82rem; color: var(--text-dim); }
.state-icon    { font-size: 2rem; margin-bottom: 4px; }

/* ── CHAPTER SELECTION ───────────────────────── */
.chapter-selection-wrap { padding: 20px 24px 40px; }

.unit-section { margin-bottom: 28px; }

.unit-header {
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  padding-bottom: 8px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.unit-count {
  font-size: 0.62rem;
  font-weight: 500;
  color: var(--text-dim);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1px 6px;
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 8px;
}

.chapter-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 13px 14px;
  cursor: pointer;
  transition: border-color var(--t), background var(--t), transform 60ms ease;
}
.chapter-card:hover {
  border-color: var(--border-2);
  background: var(--hover);
}
.chapter-card:active { transform: scale(0.98); }

.chapter-card-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
  line-height: 1.3;
}

.chapter-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  font-size: 0.72rem;
  color: var(--text-dim);
}

.chapter-done {
  font-size: 0.68rem;
  color: var(--green);
  font-weight: 600;
}

.chapter-progress {
  height: 2px;
  background: var(--border);
  border-radius: 1px;
  margin-top: 8px;
  overflow: hidden;
}
.chapter-progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 1px;
  transition: width 0.4s ease;
}

/* ── QUESTION CARD ───────────────────────────── */
.q-card { padding: 20px 24px 32px; }

.q-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 14px;
}

.q-actions-top { margin-left: auto; }

.bm-btn {
  background: none;
  border: none;
  font-size: 0.9rem;
  cursor: pointer;
  opacity: 0.4;
  transition: opacity var(--t);
  padding: 2px;
}
.bm-btn:hover, .bm-btn.active { opacity: 1; }

.q-text {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text);
  margin-bottom: 18px;
  max-width: 720px;
}

/* ── OPTIONS ─────────────────────────────────── */
.options-list { display: flex; flex-direction: column; gap: 8px; max-width: 680px; margin-bottom: 16px; }

.opt {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--r);
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  transition: border-color var(--t), background var(--t);
}
.opt:not(.disabled):hover { border-color: var(--accent-border); background: var(--accent-dim); }
.opt.selected  { border-color: var(--accent-border); background: var(--accent-dim); }
.opt.correct   { border-color: var(--green-border); background: var(--green-dim); }
.opt.incorrect { border-color: var(--red-border); background: var(--red-dim); }
.opt.disabled  { cursor: default; }

.opt-label {
  width: 20px;
  height: 20px;
  border-radius: var(--r-sm);
  background: var(--surface-2);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}
.opt.correct   .opt-label { background: var(--green-dim);  border-color: var(--green-border);  color: var(--green); }
.opt.incorrect .opt-label { background: var(--red-dim);    border-color: var(--red-border);    color: var(--red); }

.opt-text { font-size: 0.84rem; line-height: 1.6; color: var(--text); }

/* MSQ submit */
.msq-submit-wrap { margin-top: 4px; }

/* ── INTEGER INPUT ───────────────────────────── */
.num-area { display: flex; gap: 10px; align-items: center; max-width: 360px; margin-bottom: 16px; }

.num-input {
  flex: 1;
  height: 40px;
  font-size: 0.9rem;
  font-family: var(--font-mono);
  text-align: center;
  border-radius: var(--r);
}
.num-input:focus { border-color: var(--accent); }

.submit-btn {
  height: 40px;
  padding: 0 18px;
  border-radius: var(--r);
  border: none;
  background: var(--text);
  color: var(--bg);
  font-family: var(--font);
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--t);
  white-space: nowrap;
  flex-shrink: 0;
}
.submit-btn:hover:not(:disabled) { opacity: 0.85; }
.submit-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Q FOOTER ────────────────────────────────── */
.q-footer {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.sol-btn {
  padding: 5px 12px;
  border-radius: var(--r);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  font-family: var(--font);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--t);
}
.sol-btn:hover { border-color: var(--border-2); color: var(--text); }

.ans-result { font-size: 0.78rem; font-weight: 600; }
.correct-label { color: var(--green); }
.wrong-label   { color: var(--red); }

/* ── SOLUTION BOX ────────────────────────────── */
.solution {
  display: none;
  margin-top: 16px;
  padding: 16px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--r);
  max-width: 720px;
}
.solution.show { display: block; animation: fadeUp 0.18s ease; }

.sol-head {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 10px;
}

.sol-body { font-size: 0.84rem; line-height: 1.75; color: var(--text-sub); }

/* ── RIGHT PANEL (Q-GRID + STATS) ─────────────── */
.q-panel {
  width: 200px;
  flex-shrink: 0;
  border-left: 1px solid var(--border);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.panel-section {
  padding: 14px 12px;
  border-bottom: 1px solid var(--border);
}

.panel-label {
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 10px;
}

/* Q-GRID */
.q-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 3px;
}

.q-num {
  position: relative;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 500;
  border-radius: var(--r-sm);
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  cursor: pointer;
  transition: all var(--t);
  user-select: none;
}
.q-num:hover { border-color: var(--border-2); color: var(--text); }
.q-num.current { background: var(--accent); border-color: var(--accent); color: #fff; }
.q-num.answered-correct { background: var(--green-dim);  border-color: var(--green-border);  color: var(--green); }
.q-num.answered-wrong   { background: var(--red-dim);    border-color: var(--red-border);    color: var(--red); }

/* Timer dot in Q-grid cell */
.q-time-dot {
  position: absolute;
  bottom: 2px;
  right: 2px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  pointer-events: none;
}
.td-fast   { background: var(--green); }
.td-normal { background: var(--yellow); }
.td-slow   { background: var(--red); }

/* Legend */
.legend { display: flex; flex-direction: column; gap: 5px; }
.legend-item { display: flex; align-items: center; gap: 6px; font-size: 0.73rem; color: var(--text-dim); }
.legend-dot { width: 10px; height: 10px; border-radius: 3px; flex-shrink: 0; }
.ld-curr    { background: var(--accent); }
.ld-correct { background: var(--green-dim);  border: 1px solid var(--green-border); }
.ld-wrong   { background: var(--red-dim);    border: 1px solid var(--red-border); }
.ld-not     { background: var(--surface-2);  border: 1px solid var(--border); }

/* Session stats */
.session-stats { display: flex; flex-direction: column; gap: 7px; }
.stat-row { display: flex; justify-content: space-between; align-items: center; }
.stat-row .label { font-size: 0.73rem; color: var(--text-dim); }
.stat-row .val   { font-size: 0.8rem;  font-weight: 600; color: var(--text-sub); }

/* ── HIDDEN UTILITY ──────────────────────────── */
.hidden { display: none !important; }

/* ══════════════════════════════════════════════
   MOBILE
══════════════════════════════════════════════ */
@media (max-width: 768px) {
  .practice-main { margin-left: 0; }

  .q-panel { display: none; } /* Hidden on mobile (show via button later) */

  .filter-bar { height: auto; padding: 8px 14px; flex-wrap: wrap; gap: 6px; }

  .filter-controls { margin-left: 0; flex-wrap: wrap; }

  .chapter-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }

  .q-card { padding: 14px 16px 24px; }

  .mobile-bar { display: flex; }
}