.setup-panel {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  box-shadow: var(--shadow);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 20px 0 24px;
}

/* ── Math reference panel ── */
.ref-panel {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  box-shadow: var(--shadow);
  border-radius: 12px;
  padding: 14px 24px;
  margin: 20px 0 0;
}
.ref-panel[open] { padding-bottom: 20px; }
.ref-panel summary {
  font-family: 'Staatliches', sans-serif;
  font-size: 1.3em;
  letter-spacing: 2px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
}
.ref-panel summary::-webkit-details-marker { display: none; }
.ref-panel summary::after { content: '▼'; font-size: 0.55em; color: var(--text-muted); }
.ref-panel[open] summary { margin-bottom: 14px; }
.ref-panel[open] summary::after { content: '▲'; }

.ref-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px 20px;
}
.ref-item {
  background: var(--bg-formula);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 10px 12px;
}
.ref-name {
  font-size: 0.95em;
  color: var(--text);
  font-weight: 600;
  margin-bottom: 4px;
}
.ref-tag {
  font-size: 0.72em;
  color: var(--text-muted);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-left: 4px;
}
.ref-formula {
  font-family: monospace;
  font-size: 0.85em;
  color: #aaa;
  margin-bottom: 6px;
}
.ref-examples {
  margin: 0;
  padding-left: 18px;
  color: var(--text-secondary);
  font-size: 0.88em;
  line-height: 1.55;
}
.ref-examples li { font-family: monospace; }
.ref-examples b { color: var(--accent); font-family: inherit; }

.setup-panel h2 {
  margin: 0 0 14px;
  font-size: 1.3em;
  letter-spacing: 2px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}
.setup-panel h2::after { content: '▲'; font-size: 0.55em; color: var(--text-muted); }
.setup-panel.collapsed h2 { margin: 0; }
.setup-panel.collapsed h2::after { content: '▼'; }
.setup-panel.collapsed > :not(h2) { display: none; }

.cat-group { margin-bottom: 14px; }
.cat-group-title {
  font-size: 0.78em;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}
.cat-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 4px 12px;
}
.cat-item {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 6px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.92em;
  color: var(--text-secondary);
  transition: background 0.12s;
}
.cat-item:hover { background: var(--bg-card-hover); }
.cat-item input { accent-color: var(--accent); }

.math-count-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 6px 12px;
  margin-bottom: 4px;
}
.math-count-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92em;
  color: var(--text-secondary);
  padding: 3px 0;
}
.math-count-input {
  width: 52px;
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  color: var(--text);
  padding: 4px 6px;
  font-family: monospace;
  font-size: 0.95em;
  text-align: center;
  flex-shrink: 0;
}
.math-count-input:focus { outline: none; border-color: var(--accent); }

.tip-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  font-size: 0.75em;
  color: var(--text-muted);
  cursor: default;
  position: relative;
  flex-shrink: 0;
  margin-left: 2px;
}
.tip-icon::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: #2a2a2a;
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  font-size: 0.82em;
  line-height: 1.4;
  padding: 6px 10px;
  border-radius: 6px;
  white-space: normal;
  width: 220px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
  z-index: 10;
}
.tip-icon:hover { color: var(--accent); }
.tip-icon:hover::after { opacity: 1; }

.count-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.count-row label { font-size: 0.9em; color: var(--text-secondary); display: flex; align-items: center; gap: 8px; }
.count-row input[type=number] {
  width: 64px;
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  color: var(--text);
  padding: 6px 8px;
  font-family: monospace;
  font-size: 1em;
}
.count-row input[type=number]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(255,179,0,0.15);
}

button {
  background: var(--accent);
  color: #181818;
  border: none;
  border-radius: 6px;
  padding: 9px 18px;
  font-size: 0.95em;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  letter-spacing: 0.5px;
  transition: filter 0.15s, box-shadow 0.15s;
}
button:hover { filter: brightness(1.1); }
button:disabled { background: #3a3a3a; color: #666; cursor: not-allowed; filter: none; box-shadow: none; }

.setup-footer {
  display: flex;
  justify-content: flex-end;
  padding-top: 16px;
  margin-top: 4px;
  border-top: 1px solid var(--border);
}

#generate {
  background: linear-gradient(135deg, #ffb300 0%, #ff7c00 100%);
  color: #181818;
  padding: 13px 32px;
  font-size: 1em;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  border-radius: 8px;
  box-shadow: 0 2px 14px rgba(255, 140, 0, 0.35);
}
#generate:hover {
  filter: brightness(1.08);
  box-shadow: 0 4px 20px rgba(255, 140, 0, 0.5);
}

/* ── Question cards ── */
.q-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  box-shadow: var(--shadow);
  border-radius: 10px;
  padding: 18px 20px;
  margin: 14px 0;
}
.q-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}
.q-num {
  font-family: 'Staatliches', sans-serif;
  font-size: 1.3em;
  color: var(--accent);
  letter-spacing: 1px;
  min-width: 22px;
}
.q-cat { font-size: 0.78em; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }
.q-formula-hint { font-family: monospace; font-size: 0.78em; color: var(--text-faint); margin-left: 6px; }
.q-text { line-height: 1.55; margin-bottom: 12px; }

.q-choices { display: flex; flex-direction: column; gap: 6px; }
.q-choice {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}
.q-choice:hover { background: var(--bg-card-hover); }
.q-choice input { margin-top: 3px; accent-color: var(--accent); flex-shrink: 0; }
.q-letter { font-family: monospace; color: var(--text-muted); font-weight: bold; min-width: 18px; flex-shrink: 0; }
.q-choice-text { line-height: 1.45; }

.q-choice.correct { background: rgba(74,222,128,0.08); border-color: rgba(74,222,128,0.3); }
.q-choice.correct .q-letter { color: var(--green); }
.q-choice.wrong { background: rgba(248,113,113,0.08); border-color: rgba(248,113,113,0.3); }
.q-choice.wrong .q-letter { color: var(--red); }

/* ── Reveal ── */
.q-reveal { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border); }
.q-verdict { font-size: 0.85em; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 8px; }
.q-verdict.right { color: var(--green); }
.q-verdict.miss { color: var(--red); }
.q-verdict.skipped { color: var(--text-muted); }

.q-explanation { color: var(--text-secondary); line-height: 1.6; margin-bottom: 10px; }

.q-formula {
  background: var(--bg-formula);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 12px 14px;
  margin: 10px 0;
}
.formula-title { font-size: 0.75em; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 8px; }
.formula-inputs {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 8px;
}
.formula-field { display: flex; flex-direction: column; gap: 4px; }
.formula-label { font-size: 0.75em; color: var(--text-muted); }
.formula-control { display: flex; align-items: center; gap: 8px; }
.formula-range {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
  height: 4px;
  min-width: 0;
}
.formula-number {
  width: 58px;
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  color: var(--text);
  padding: 4px 6px;
  font-family: monospace;
  font-size: 0.88em;
  text-align: right;
  flex-shrink: 0;
}
.formula-number:focus { outline: none; border-color: var(--accent); }

.formula-toggle {
  display: flex;
  gap: 6px;
}
.formula-toggle-btn {
  flex: 1;
  background: var(--bg-input);
  color: var(--text-muted);
  border: 1px solid var(--border-light);
  border-radius: 5px;
  padding: 6px 10px;
  font-size: 0.82em;
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
  box-shadow: none;
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}
.formula-toggle-btn.active {
  background: rgba(255,179,0,0.15);
  color: var(--accent);
  border-color: var(--accent);
}
.formula-toggle-btn:hover:not(.active) { background: var(--bg-card-hover); color: var(--text-secondary); }
.formula-expr { font-family: monospace; color: #888; font-size: 0.85em; margin: 6px 0 4px; }
.formula-out { font-family: monospace; font-size: 0.95em; }
.out-label { color: var(--text-muted); }
.out-value { color: var(--accent); font-weight: bold; font-size: 1.1em; margin-left: 4px; }

.q-source { margin-top: 8px; font-size: 0.78em; color: var(--text-faint); font-style: italic; }

.suit-r { color: #f87171; }
.suit-b { color: #ddd; }

/* ── Reveal / Summary buttons ── */
#reveal {
  display: block;
  width: 100%;
  padding: 14px;
  font-size: 1em;
  margin: 20px 0 8px;
  background: linear-gradient(135deg, #ffb300 0%, #ff7c00 100%);
  color: #181818;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  border-radius: 8px;
  box-shadow: 0 2px 14px rgba(255, 140, 0, 0.3);
}
#reveal:hover { filter: brightness(1.08); box-shadow: 0 4px 20px rgba(255, 140, 0, 0.45); }
#reveal:disabled { background: #3a3a3a; color: #666; box-shadow: none; }

.summary {
  background: var(--bg-result);
  border: 1px solid rgba(255,255,255,0.06);
  box-shadow: var(--shadow);
  border-radius: 10px;
  padding: 20px 24px;
  margin: 8px 0 40px;
  text-align: center;
}
.sum-score {
  font-family: 'Staatliches', sans-serif;
  font-size: 2em;
  letter-spacing: 3px;
  color: var(--accent);
  margin-bottom: 10px;
}
.sum-pct { font-size: 0.65em; color: var(--text-muted); }
.sum-breakdown {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 16px;
}
.sum-cat {
  font-size: 0.85em;
  color: var(--text-secondary);
  background: var(--bg-card);
  padding: 3px 10px;
  border-radius: 20px;
}

.warn {
  background: rgba(248,113,113,0.08);
  border: 1px solid rgba(248,113,113,0.3);
  color: var(--red);
  border-radius: 6px;
  padding: 12px 16px;
  margin: 12px 0;
}

#reveal-hint {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: #222;
  border: 1px solid #333;
  color: #666;
  font-size: 0.8em;
  letter-spacing: 0.5px;
  padding: 7px 18px;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  z-index: 100;
  transition: color 0.15s, border-color 0.15s, opacity 0.3s;
}
#reveal-hint:hover { color: var(--text-secondary); border-color: #555; }

@media (max-width: 500px) {
  .cat-list { grid-template-columns: 1fr 1fr; }
  .formula-inputs { grid-template-columns: 1fr 1fr; }
}