/* ==========================================================================
   Excel & accounts quiz: page styles. Built only from site.css tokens.
   ========================================================================== */

/* Panel ------------------------------------------------------------------ */
.quiz-panel { position: relative; overflow: hidden; isolation: isolate; }
.quiz-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-mask-image: radial-gradient(ellipse 80% 55% at 100% 0%, #000, transparent 70%);
  mask-image: radial-gradient(ellipse 80% 55% at 100% 0%, #000, transparent 70%);
  pointer-events: none;
}
html:not(.js) #quiz-intro .btn-group { display: none; }

/* Intro ------------------------------------------------------------------ */
.intro-cells { display: grid; grid-template-columns: repeat(4, 2.5rem); gap: 0.4rem; }
.intro-cells span {
  display: grid;
  place-items: center;
  height: 2.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--surface-2);
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-muted);
}
.intro-cells span.ok { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-text); box-shadow: 0 0 24px -6px var(--glow-1); }
.intro-list { list-style: none; padding: 0; display: grid; gap: 0.85rem; }
.intro-list li { display: grid; grid-template-columns: 3rem minmax(0, 1fr); gap: 0.85rem; align-items: baseline; color: var(--text-muted); }
.intro-num {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  text-align: right;
  font-variant-numeric: tabular-nums;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.best-line { margin-top: 1.25rem; }

/* Question header ------------------------------------------------------ */
.quiz-topbar { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 0.75rem; }
.quiz-count { font-size: var(--fs-sm); font-weight: 600; font-variant-numeric: tabular-nums; }
.quiz-score { margin-left: auto; }
.quiz-score strong { color: var(--text); font-size: 1rem; }

.q-strip { display: grid; grid-template-columns: repeat(15, minmax(0, 1fr)); gap: 3px; margin-top: 0.9rem; }
.q-seg {
  height: 6px;
  border-radius: 2px;
  background: var(--surface-2);
  box-shadow: inset 0 0 0 1px var(--border);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.q-seg.is-current { background: var(--accent-soft-strong); box-shadow: inset 0 0 0 1px var(--accent); }
.q-seg.is-right { background: var(--accent); box-shadow: none; }
.q-seg.is-wrong { background: var(--danger); box-shadow: none; }

.q-text {
  margin-top: 1.5rem;
  font-size: clamp(1.3rem, 1.1rem + 0.9vw, 1.75rem);
  font-weight: 650;
  letter-spacing: -0.025em;
  line-height: 1.25;
  text-wrap: balance;
}
.q-text:focus { outline: none; }
.q-text:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 6px; }

/* Formula bar ------------------------------------------------------------ */
.formula-bar {
  display: flex;
  align-items: stretch;
  margin-top: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-strong);
  background: var(--input-bg);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.95rem;
}
.formula-bar .fx {
  display: grid;
  place-items: center;
  padding: 0 0.8rem;
  font-style: italic;
  font-weight: 600;
  color: var(--accent-text);
  background: var(--surface-2);
  border-right: 1px solid var(--border);
}
.formula-bar code { padding: 0.65rem 0.9rem; overflow-x: auto; white-space: nowrap; font-family: inherit; color: var(--text); min-width: 0; }

/* Options ---------------------------------------------------------------- */
.options { list-style: none; padding: 0; margin-top: 1.25rem; display: grid; gap: 0.6rem; }
.option {
  position: relative;
  width: 100%;
  min-height: 56px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 1.5rem;
  align-items: center;
  gap: 0.9rem;
  padding: 0.7rem 0.9rem 0.7rem 0.7rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-strong);
  background: var(--input-bg);
  text-align: left;
  line-height: 1.4;
  font-weight: 500;
  color: var(--text);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), transform var(--dur) var(--ease), opacity var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.option:hover:not([aria-disabled="true"]) { border-color: var(--accent); background: var(--surface-hover); transform: translateY(-1px); box-shadow: 0 0 0 4px var(--accent-soft); }
.option:active:not([aria-disabled="true"]) { transform: translateY(0); }
.option:focus-visible { outline-offset: 2px; border-radius: var(--radius-lg); }
.option[aria-disabled="true"] { cursor: default; }
.option-key {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--surface-2);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.option:hover:not([aria-disabled="true"]) .option-key { border-color: var(--accent); color: var(--accent-text); }
.option-text { min-width: 0; overflow-wrap: anywhere; }
.option-mark { display: grid; place-items: center; width: 1.5rem; height: 1.5rem; }
.option-mark svg { width: 1.25rem; height: 1.25rem; }

.option.is-correct { border-color: var(--accent); background: var(--accent-soft); }
.option.is-correct .option-key { background: var(--accent); border-color: var(--accent); color: var(--accent-contrast); }
.option.is-correct .option-mark { color: var(--accent-text); }
.option.is-wrong { border-color: var(--danger); background: var(--danger-soft); }
.option.is-wrong .option-key { background: var(--danger); border-color: var(--danger); color: var(--bg); }
.option.is-wrong .option-mark { color: var(--danger); }
.option.is-dimmed { opacity: 0.55; }
.option.is-correct, .option.is-wrong { animation: pop-in 320ms var(--ease) both; }

.key-hint { margin-top: 0.75rem; }
.key-hint kbd { font-size: 0.7rem; }
@media (hover: none) { .key-hint { display: none; } }

/* Staggered entrance for a new question */
.is-entering .q-text,
.is-entering .formula-bar { animation: enter-up 500ms var(--ease) both; }
.is-entering .option { animation: enter-up 500ms var(--ease) both; animation-delay: calc(var(--d, 0ms) + 80ms); }

/* Feedback --------------------------------------------------------------- */
.feedback {
  margin-top: 1.25rem;
  padding: 1rem 1.15rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface-2);
}
.feedback.is-right { border-color: var(--accent-soft-strong); background: var(--accent-soft); }
.feedback.is-wrong { border-color: var(--danger-soft); background: var(--danger-soft); }
.feedback-verdict { display: flex; align-items: flex-start; gap: 0.5rem; font-weight: 650; }
.feedback-verdict svg { width: 1.2rem; height: 1.2rem; margin-top: 0.15rem; flex: none; }
.feedback.is-right .feedback-verdict svg { color: var(--accent-text); }
.feedback.is-wrong .feedback-verdict svg { color: var(--danger); }
.feedback-text { margin-top: 0.4rem; color: var(--text-muted); font-size: var(--fs-sm); line-height: 1.6; }
.quiz-actions { margin-top: 1.25rem; }
.quiz-actions:empty { display: none; }

/* Results ---------------------------------------------------------------- */
.result-top { position: relative; display: grid; justify-items: start; gap: 0.35rem; }
.score-big {
  display: flex;
  align-items: baseline;
  gap: 0.1em;
  font-size: clamp(3.5rem, 2.4rem + 6vw, 6rem);
  font-weight: 750;
  letter-spacing: -0.06em;
  line-height: 0.95;
  font-variant-numeric: tabular-nums;
}
.score-big .text-gradient { padding-bottom: 0.06em; }
.score-of { font-size: 0.42em; color: var(--text-faint); letter-spacing: -0.03em; font-weight: 600; }
.grade-cell {
  margin-top: 0.5rem;
  display: inline-block;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-xs);
  font-size: var(--fs-sm);
  font-weight: 600;
  box-shadow: inset 0 0 0 2px var(--accent);
  background: var(--accent-soft);
  color: var(--accent-text);
}
.grade-cell.is-low { box-shadow: inset 0 0 0 2px var(--danger); background: var(--danger-soft); color: var(--danger); }
.grade-cell.is-mid { box-shadow: inset 0 0 0 2px var(--accent-2); background: var(--accent-2-soft); color: var(--accent-2); }
.grade-title { font-size: var(--fs-h3); font-weight: 680; letter-spacing: -0.025em; line-height: 1.2; margin-top: 0.25rem; }
.grade-title:focus { outline: none; }
.grade-title:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 4px; }
.share-fallback { display: grid; gap: 0.4rem; }
.share-fallback .textarea { min-height: 7rem; font-size: 0.85rem; }

/* Celebration burst (13+). Decorative only; skipped under reduced motion. */
.burst { position: absolute; left: 5rem; top: 4rem; width: 0; height: 0; pointer-events: none; }
.burst-cell {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: var(--accent);
  opacity: 0;
  animation: burst-fly 1.3s var(--ease) var(--d, 0ms) forwards;
}
.burst-cell.alt { background: var(--accent-2); }
@keyframes burst-fly {
  0% { opacity: 0; transform: translate(0, 0) rotate(0deg) scale(0.4); }
  15% { opacity: 1; }
  100% { opacity: 0; transform: translate(var(--x), var(--y)) rotate(var(--r)) scale(1); }
}

/* Review list */
.review-list { list-style: none; padding: 0; display: grid; gap: 0.9rem; }
.review-item { display: grid; grid-template-columns: 1.75rem minmax(0, 1fr); gap: 0.75rem; padding-top: 0.9rem; border-top: 1px solid var(--border); }
.review-item:first-child { border-top: 0; padding-top: 0.25rem; }
.review-icon { display: grid; place-items: center; width: 1.75rem; height: 1.75rem; border-radius: var(--radius-xs); }
.review-icon svg { width: 1rem; height: 1rem; }
.review-item.is-right .review-icon { background: var(--accent-soft); color: var(--accent-text); }
.review-item.is-wrong .review-icon { background: var(--danger-soft); color: var(--danger); }
.review-q { color: var(--text); font-weight: 560; }
.review-a { margin-top: 0.2rem; }
.review-a strong { color: var(--accent-text); }
.review-wrong { color: var(--danger); text-decoration: line-through; text-decoration-thickness: 1px; }
.review-x { margin-top: 0.25rem; font-size: var(--fs-xs); line-height: 1.55; }

/* Answer sheet ----------------------------------------------------------- */
.sheet-head { gap: 0.5rem; }
.sheet-wrap { border-radius: var(--radius-md); border: 1px solid var(--border); overflow: hidden; background: var(--input-bg); }
.answer-sheet th, .answer-sheet td { height: 32px; padding: 0.3rem 0.6rem; }
.answer-sheet tr > :last-child { border-right: 0; }
.answer-sheet thead th { text-transform: uppercase; letter-spacing: 0.06em; }
.answer-sheet thead th:nth-child(2) { text-align: left; }
.answer-sheet tbody th { width: 2.5rem; font-variant-numeric: tabular-nums; }
.answer-sheet thead th:last-child, .answer-sheet .sheet-mark { width: 4.25rem; }
.sheet-topic { color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 0; width: 100%; font-size: 0.78rem; }
.sheet-cat { display: inline-block; margin-right: 0.45rem; padding: 0 0.35rem; border-radius: 4px; font-size: 0.66rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; vertical-align: 1px; }
.sheet-cat-excel { background: var(--accent-soft); color: var(--accent-text); }
.sheet-cat-accounts { background: var(--accent-2-soft); color: var(--accent-2); }
.sheet-mark { font-weight: 600; white-space: nowrap; }
.sheet-mark .mark-icon { display: inline-block; width: 0.85rem; height: 0.85rem; margin-right: 0.35rem; vertical-align: -1px; }
.answer-sheet tr.is-right .sheet-mark { color: var(--accent-text); }
.answer-sheet tr.is-wrong .sheet-mark { color: var(--danger); }
.answer-sheet tbody tr { transition: background-color var(--dur) var(--ease); }
.answer-sheet tbody tr.is-current { background: var(--accent-soft); }
.answer-sheet tbody tr.is-current .sheet-mark { box-shadow: inset 0 0 0 2px var(--accent); }
.answer-sheet tbody tr.is-current th { color: var(--accent-text); }
.answer-sheet tbody tr:last-child > * { border-bottom: 1px solid var(--border-strong); }
.answer-sheet tfoot th, .answer-sheet tfoot td { border-bottom: 0; height: 40px; background: var(--surface-2); }
.answer-sheet tfoot th { text-align: left; color: var(--text); font-family: var(--font-sans); font-size: var(--fs-sm); }
.sum-label { font-weight: 650; }
.sum-formula { margin-left: 0.4rem; font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-faint); font-weight: 400; }
#sheet-total {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: underline double var(--accent);
  text-underline-offset: 4px;
}

@media (max-width: 399.98px) {
  .option { gap: 0.65rem; padding-left: 0.55rem; }
  .option-key { width: 2rem; height: 2rem; }
  .sheet-cat { display: none; }
  .q-strip { gap: 2px; }
}