*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg: #f4f1ec;
  --surface: #ffffff;
  --ink: #1a1a1a;
  --muted: #5c5c5c;
  --accent: #1e5a8a;
  --accent-hover: #164a72;
  --card-front: #e8f0f8;
  --card-back: #fdf6e3;
  --radius: 16px;
  --shadow: 0 12px 40px rgba(30, 58, 95, 0.12);
  font-family: "Segoe UI", system-ui, sans-serif;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.45;
}

.app {
  max-width: 28rem;
  margin: 0 auto;
  padding: 1.25rem 1rem 2rem;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* Stan startowy aplikacji (boot / fetch JSON) */
.app-loading,
.app-boot-error {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 1rem;
  padding: 2rem 1rem;
  min-height: 60dvh;
  color: var(--ink);
}

.app-boot-error .sub {
  margin: 0;
  max-width: 22rem;
}

/* Podsumowanie quizu fiszek */
.flash-complete-scene {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 1.25rem;
  padding: 2rem 1rem;
  min-height: 50dvh;
}

.flash-complete-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
}

h1 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 0.35rem;
  letter-spacing: -0.02em;
}

.sub {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.1rem;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  background: var(--accent);
  color: #fff;
  width: 100%;
  transition: background 0.15s ease, transform 0.1s ease;
}

.btn:hover {
  background: var(--accent-hover);
}

.btn:active {
  transform: scale(0.98);
}

.btn-secondary {
  background: var(--surface);
  color: var(--ink);
  border: 1px solid rgba(0, 0, 0, 0.08);
}

.btn-secondary:hover {
  background: #f0f0f0;
}

.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  margin-top: auto;
  padding-top: 1rem;
}

.progress {
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.scene {
  perspective: 1200px;
  flex: 1;
  display: flex;
  align-items: center;
  min-height: 14rem;
}

.quiz-scene {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.quiz-card {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--card-front);
  border-radius: var(--radius);
  padding: 1rem 1rem 1.1rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(30, 90, 138, 0.12);
}

.quiz-card--flip {
  gap: 0.75rem;
}

/* Stała wysokość — po ujawnieniu pełnej fiszki przyciski opcji nie „skaczą”. */
.quiz-prompt-slot {
  flex-shrink: 0;
  box-sizing: border-box;
  height: clamp(12.5rem, 36dvh, 18.5rem);
  min-height: clamp(12.5rem, 36dvh, 18.5rem);
  overflow: hidden;
}

.quiz-prompt-question {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0.25rem 0.15rem;
  box-sizing: border-box;
}

.quiz-flip-face {
  height: 100%;
  box-sizing: border-box;
  padding: 0.9rem 0.8rem;
  border-radius: 12px;
  background: var(--card-back);
  border: 1px solid rgba(0, 0, 0, 0.08);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.quiz-card--flip .label {
  font-size: 0.78rem;
  margin-bottom: 0.45rem;
}

.quiz-flip-topic {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.55rem;
  color: var(--ink);
  line-height: 1.35;
}

.quiz-flip-formula {
  font-size: 1.55rem;
  margin: 0 0 0.45rem;
}

.quiz-flip-formula .katex {
  font-size: 1.65em;
}

.quiz-flip-face .symbol-legend {
  margin-top: 0.35rem;
  font-size: 0.92rem;
}

.quiz-flip-face .symbol-legend-row {
  font-size: 0.9rem;
}

.quiz-flip-face .symbol-legend-tex .katex {
  font-size: 1.05em;
}

.quiz-question-title {
  font-size: 1.28rem;
  font-weight: 700;
  margin: 0;
  line-height: 1.35;
  color: var(--ink);
}

.quiz-head-symbol {
  font-weight: 600;
}

.quiz-head-symbol .katex {
  font-size: 1em;
}

.quiz-options {
  flex: 1;
  display: grid;
  gap: 0.55rem;
  min-height: 0;
}

/* Krótkie wzory: 2×2 — cztery opcje w jednym „rzucie oka” */
.quiz-options--grid2 {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: repeat(2, minmax(3.25rem, 1fr));
}

/* Długie / złożone: jedna kolumna */
.quiz-options--stack {
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: repeat(4, minmax(4.15rem, auto));
}

.quiz-card--flip .quiz-options--stack {
  flex: 1 1 auto;
  min-height: 0;
}

@media (max-width: 360px) {
  .quiz-options--grid2 {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(4, minmax(3.25rem, 1fr));
  }
}

.quiz-option {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  min-width: 0;
  max-width: 100%;
  width: 100%;
  box-sizing: border-box;
  margin: 0;
  padding: 0.55rem 0.7rem;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  background: var(--surface);
  cursor: pointer;
  text-align: center;
  font: inherit;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.quiz-option:hover:not(:disabled) {
  border-color: rgba(30, 90, 138, 0.25);
  box-shadow: 0 2px 8px rgba(30, 58, 95, 0.08);
}

.quiz-option:disabled {
  cursor: default;
  opacity: 1;
}

.quiz-option--correct {
  border-color: #2a8f4a;
  background: rgba(42, 143, 74, 0.12);
  box-shadow: 0 0 0 1px rgba(42, 143, 74, 0.25);
}

.quiz-option--wrong-pick {
  border-color: #c43333;
  background: rgba(196, 51, 51, 0.1);
  box-shadow: 0 0 0 1px rgba(196, 51, 51, 0.28);
}

.quiz-option-formula {
  margin: 0;
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
  max-width: 100%;
  overflow-x: hidden;
  overflow-y: visible;
  overflow-wrap: anywhere;
  word-break: break-word;
  white-space: normal;
  display: block;
  text-align: center;
  line-height: 1.35;
}

/* Większy KaTeX w przyciskach quizu fiszek */
.quiz-option .quiz-option-formula .katex {
  font-size: 1.45em;
  max-width: 100%;
  white-space: normal;
  overflow-wrap: anywhere;
}

.quiz-option .quiz-option-formula .katex-display {
  margin: 0;
  max-width: 100%;
  white-space: normal;
  overflow-wrap: anywhere;
}

.quiz-formula-stack {
  width: 100%;
  min-width: 0;
}

.quiz-formula-main {
  margin: 0;
}

.quiz-formula-hint {
  margin: 0.35rem 0 0;
  padding: 0 0.15rem;
  font-size: 0.82rem;
  line-height: 1.35;
  color: var(--muted);
  font-weight: 500;
}

.quiz-flip-formula-split .quiz-formula-main .katex {
  font-size: 1.65em;
}

.quiz-flip-formula-split .quiz-formula-hint {
  font-size: 0.9rem;
}

.quiz-formula-stack .quiz-formula-main + .quiz-formula-main,
.quiz-formula-stack .quiz-formula-main + .quiz-formula-hint,
.quiz-formula-stack .quiz-formula-hint {
  margin-top: 0.32rem;
}

.sheet-formula-stack .sheet-formula-body .katex {
  font-size: 0.95em;
}

.sheet-formula-stack .quiz-formula-main .katex {
  font-size: 0.95em;
}

/* Wzory z \\vec — wyraźniejsza kreska wektora i litera pod nią (KaTeX .mord.accent) */
.quiz-option.is-vector-distractor .katex .mord.accent,
.quiz-option.is-vector-distractor .katex .mord.accent .mord {
  font-weight: 700;
}

.quiz-option.is-vector-distractor .katex .mord.accent svg path {
  stroke: currentColor;
  stroke-width: 0.14em;
  paint-order: stroke fill;
}

.quiz-full-card {
  margin-top: 1rem;
  padding: 0.85rem 0.75rem;
  border-radius: 12px;
  background: var(--card-back);
  border: 1px solid rgba(0, 0, 0, 0.08);
}

.quiz-full-topic {
  font-size: 0.88rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--ink);
}

.card {
  width: 100%;
  min-height: 220px;
  cursor: pointer;
  border: none;
  background: transparent;
  padding: 0;
  text-align: left;
  -webkit-tap-highlight-color: transparent;
}

.card:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
  border-radius: var(--radius);
}

.card-inner {
  position: relative;
  width: 100%;
  min-height: 220px;
  transition: transform 0.55s cubic-bezier(0.4, 0.2, 0.2, 1);
  transform-style: preserve-3d;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card.flipped .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  padding: 1.25rem 1.1rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.card-front {
  background: var(--card-front);
  border: 1px solid rgba(30, 90, 138, 0.12);
}

.card-back {
  background: var(--card-back);
  border: 1px solid rgba(0, 0, 0, 0.06);
  transform: rotateY(180deg);
  justify-content: flex-start;
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.card-back .hint {
  margin-top: auto;
}

.card-back .formula {
  flex-shrink: 0;
}

.label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}

.formula {
  font-size: 1.15rem;
  font-family: "Cambria Math", "Times New Roman", serif;
  margin: 0;
  word-break: break-word;
}

.formula .katex,
.answer-text .katex {
  font-size: 1.05em;
}

.formula-subheading {
  margin: 0.65rem 0 0.35rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  font-family: "Segoe UI", system-ui, sans-serif;
}

.formula-subheading:first-child {
  margin-top: 0;
}

.law-list li {
  font-family: "Segoe UI", system-ui, sans-serif;
  font-size: 0.95rem;
}

.formula-list .katex {
  font-size: 1.05em;
}

.formula .katex-display,
.answer-text .katex-display {
  margin: 0;
}

.task-q .katex {
  font-size: 0.98em;
}

.hint {
  margin-top: 0.85rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.intro-actions {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 0.5rem;
}

.flash-mode-row {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 0.5rem;
}

.flash-mode-row .btn:disabled,
.flash-mode-row .btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
}

.flash-topic-heading {
  margin-top: 1rem;
}

.flash-topic-grid {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-top: 0.35rem;
}

.flash-topic-tile {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.45rem;
  width: 100%;
  box-sizing: border-box;
  text-align: left;
  padding: 0.75rem 0.95rem;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  background: var(--surface);
  font: inherit;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.flash-topic-tile:hover {
  background: #f7f7f7;
  border-color: rgba(30, 90, 138, 0.2);
}

.flash-topic-tile-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.65rem;
}

.flash-topic-tile-title {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.35;
  flex: 1;
  min-width: 0;
}

.flash-topic-tile-counts {
  flex-shrink: 0;
  font-size: 0.78rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  white-space: nowrap;
}

.flash-topic-bar {
  height: 0.45rem;
  border-radius: 6px;
  width: 100%;
  overflow: hidden;
}

.flash-topic-tile-n {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--muted);
}

.top-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.top-bar h1,
.top-bar .top-bar-title {
  flex: 1;
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.btn-back {
  width: auto;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
}

.tabs {
  display: flex;
  gap: 0;
  margin: 0 0 1.25rem;
  border-radius: 12px;
  padding: 4px;
  background: rgba(0, 0, 0, 0.06);
}

.tab {
  flex: 1;
  border: none;
  border-radius: 10px;
  padding: 0.65rem 0.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  background: transparent;
  color: var(--muted);
  transition: background 0.15s ease, color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.tab:hover {
  color: var(--ink);
}

.tab[aria-selected="true"] {
  background: var(--surface);
  color: var(--accent);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.tab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.tabs-main .tab {
  font-size: 0.82rem;
  padding: 0.58rem 0.3rem;
  line-height: 1.2;
}

.tabs-level {
  margin-bottom: 0.5rem;
}

.tabs-task-class {
  margin-bottom: 0.5rem;
}

.tabs-level .tab {
  font-size: 0.8rem;
  padding: 0.52rem 0.35rem;
  line-height: 1.2;
}

.tabs-task-class .tab {
  font-size: 0.78rem;
  padding: 0.48rem 0.3rem;
  line-height: 1.2;
}

/* Lista zadań (`task-chapters`): drzewo programu — białe rozdziały, żółte podrozdziały. */
.task-chapters-toolbar {
  margin: 0 0 0.45rem;
}

.btn-link-back {
  display: inline-block;
  padding: 0;
  margin: 0;
  border: none;
  background: none;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.btn-link-back:hover {
  color: var(--ink);
}

.task-dzialy-heading {
  margin-top: 0.35rem;
}

.task-class-heading {
  margin: 0.85rem 0 0.5rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.task-class-heading:first-child {
  margin-top: 0.25rem;
}

.task-curriculum-root .task-rozdzial {
  margin-bottom: 0.5rem;
}

.task-rozdzial--nested {
  margin-top: 0.35rem;
  margin-left: 0.35rem;
}

.task-rozdzial-head {
  display: flex;
  align-items: flex-start;
  gap: 0.45rem;
  width: 100%;
  box-sizing: border-box;
  text-align: left;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  background: var(--surface);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.task-rozdzial-head:hover {
  background: #f7f7f7;
  border-color: rgba(30, 90, 138, 0.2);
}

.task-rozdzial-chev {
  flex: 0 0 auto;
  font-size: 0.72rem;
  line-height: 1.6;
  color: var(--muted);
  user-select: none;
}

.task-rozdzial-title-wrap {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.task-rozdzial-title {
  font-weight: 600;
  line-height: 1.35;
}

.task-rozdzial-meta {
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--muted);
}

.task-podrozdzial-stack {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin: 0.45rem 0 0 0.65rem;
  padding-left: 0.35rem;
  border-left: 2px solid rgba(30, 90, 138, 0.12);
}

/* `display: flex` wyżej wygrywał z domyślnym `[hidden]` — bez tego podrozdziały były zawsze widoczne. */
.task-podrozdzial-stack[hidden] {
  display: none !important;
}

.task-podrozdzial-card {
  display: block;
  width: 100%;
  box-sizing: border-box;
  text-align: left;
  padding: 0.65rem 0.85rem;
  border-radius: 10px;
  border: 1px solid rgba(180, 150, 40, 0.22);
  background: #fef9e7;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.task-podrozdzial-card:hover {
  background: #fdf3d0;
  border-color: rgba(140, 110, 20, 0.35);
}

.task-podrozdzial-card--nested {
  margin-left: 0.25rem;
}

.task-podrozdzial-title {
  display: block;
  line-height: 1.35;
}

.task-podrozdzial-meta {
  display: block;
  margin-top: 0.2rem;
  font-weight: 400;
  font-size: 0.78rem;
  color: var(--muted);
}

.panel-sub {
  margin: -0.15rem 0 0.85rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.sheet-scroll {
  max-height: calc(100dvh - 13.5rem);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding-right: 0.15rem;
}

.sheet-panel-wrap {
  margin-top: 0.25rem;
}

.sheet-official-pdf {
  margin: 0 0 0.65rem;
  font-size: 0.88rem;
  line-height: 1.45;
  color: var(--muted);
}

.sheet-official-pdf-link {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.12em;
}

.sheet-official-pdf-link:hover {
  text-decoration-thickness: from-font;
}

.sheet-official-pdf-note {
  font-weight: 400;
  color: var(--muted);
}

.sheet-layout {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.sheet-topic-nav {
  flex-shrink: 0;
}

.sheet-topic-label {
  display: block;
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
}

.sheet-topic-select {
  width: 100%;
  box-sizing: border-box;
  font: inherit;
  font-size: 0.92rem;
  padding: 0.55rem 0.65rem;
  border-radius: var(--radius);
  border: 1px solid rgba(0, 0, 0, 0.12);
  background: var(--surface);
  color: var(--ink);
}

.sheet-topic-content {
  min-width: 0;
  flex: 1;
  min-height: 0;
}

.sheet-card {
  padding: 0.65rem 0.35rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.sheet-card:last-child {
  border-bottom: none;
}

.sheet-card-title {
  margin: 0 0 0.35rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink);
}

.sheet-formula {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
}

.sheet-formula .katex-display {
  margin: 0.25rem 0;
}

/* Wzory: poziome przewijanie bez widocznego paska (mysz/kółko/touch nadal działają). */
.sheet-formula,
.formula .katex-display,
.answer-text .katex-display,
.task-q .katex-display,
.rich-formula-block {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.sheet-formula::-webkit-scrollbar,
.formula .katex-display::-webkit-scrollbar,
.answer-text .katex-display::-webkit-scrollbar,
.task-q .katex-display::-webkit-scrollbar,
.rich-formula-block::-webkit-scrollbar {
  display: none;
  height: 0;
}

.symbol-legend {
  margin: 0.35rem 0 0;
  padding: 0.5rem 0.55rem;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.symbol-legend-row {
  display: flex;
  gap: 0.4rem;
  align-items: baseline;
  margin-bottom: 0.25rem;
  font-size: 0.78rem;
  line-height: 1.35;
}

.symbol-legend-row:last-child {
  margin-bottom: 0;
}

.symbol-legend-tex {
  flex: 0 0 auto;
  max-width: 42%;
}

.symbol-legend-tex .katex {
  font-size: 0.95em;
}

.symbol-legend-sep {
  flex: 0 0 auto;
  color: var(--muted);
  font-weight: 500;
  user-select: none;
}

.symbol-legend-desc {
  flex: 1;
  min-width: 0;
  color: var(--ink);
}

.task-quiz-symbol-legend {
  margin-top: 0.65rem;
}

.task-quiz-symbol-legend .answer-label {
  margin-bottom: 0.25rem;
}

.task-quiz-symbol-legend .symbol-legend {
  margin-top: 0.25rem;
}

@media (min-width: 28rem) {
  .task-quiz-symbol-legend .symbol-legend {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 1rem;
    row-gap: 0.1rem;
  }

  .task-quiz-symbol-legend .symbol-legend-row {
    margin-bottom: 0.12rem;
  }
}

.panel-title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 0.75rem;
  color: var(--ink);
}

.list-stack {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.list-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  background: var(--surface);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--ink);
  transition: background 0.15s ease, border-color 0.15s ease;
}

.list-item:hover {
  background: #f7f7f7;
  border-color: rgba(30, 90, 138, 0.2);
}

.list-item small {
  display: block;
  margin-top: 0.25rem;
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--muted);
}

.curriculum-crumb {
  margin: 0 0 0.75rem;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.45;
  word-break: break-word;
}

.task-sheet {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.1rem;
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}

.task-q {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 1rem;
  margin: 0 0 1rem;
  line-height: 1.5;
}

.task-formula-quiz {
  margin: 0 0 1rem;
  padding: 0.85rem 0.75rem;
  border-radius: 12px;
  background: var(--card-front);
  border: 1px solid rgba(30, 90, 138, 0.14);
}

.task-formula-quiz .answer-label {
  margin-top: 0;
}

.task-quiz-prompt {
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0 0 0.65rem;
  color: var(--ink);
}

.task-sheet .task-quiz-options {
  flex: 0 0 auto;
  min-height: 0;
}

/* Bramka zadania: jedna kolumna — wiersze rosną z treścią (rationale pod opcją). */
.task-sheet .task-quiz-options.quiz-options--stack {
  grid-template-rows: none;
  grid-auto-rows: auto;
  align-content: start;
}

.task-quiz-option-cell {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
  min-height: 0;
}

.task-quiz-option-cell .quiz-option {
  flex: 1 1 auto;
  min-height: 3rem;
}

.task-quiz-option-rationale {
  padding: 0.45rem 0.5rem;
  border-radius: 8px;
  border-left: 3px solid #c43333;
  background: rgba(196, 51, 51, 0.08);
  font-size: 0.82rem;
  line-height: 1.42;
  color: var(--ink);
}

.task-quiz-option-rationale-label {
  font-weight: 700;
  display: block;
  margin-bottom: 0.2rem;
  color: #8a2222;
  font-size: 0.8rem;
}

.task-quiz-option-rationale-body .rich-text-line {
  margin: 0;
}

@keyframes task-quiz-unlock-in {
  from {
    opacity: 0.35;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.task-sheet.task-quiz-unlock-anim .task-actions {
  animation: task-quiz-unlock-in 0.42s ease forwards;
}

.btn.btn-gated {
  opacity: 0.45;
  cursor: not-allowed;
}

.answer-block {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed rgba(0, 0, 0, 0.12);
}

.answer-block.hidden {
  display: none;
}

.formulas-block {
  margin-top: 0.75rem;
  padding: 0.85rem 0.95rem;
  border-radius: 12px;
  background: var(--card-front);
  border: 1px solid rgba(30, 90, 138, 0.15);
}

.formulas-block.hidden {
  display: none;
}

.formula-list {
  margin: 0;
  padding-left: 1.15rem;
}

.formula-list li {
  margin-bottom: 0.35rem;
  font-size: 0.98rem;
  font-family: "Cambria Math", "Times New Roman", serif;
  line-height: 1.45;
}

.formula-list li:last-child {
  margin-bottom: 0;
}

.task-actions {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.solution-block {
  margin-top: 0.75rem;
  padding: 0.85rem 0.95rem;
  border-radius: 12px;
  background: #f0faf4;
  border: 1px solid rgba(20, 100, 60, 0.2);
}

.solution-block.hidden {
  display: none;
}

.solution-steps {
  margin: 0;
  padding-left: 1.2rem;
}

.solution-steps li {
  margin-bottom: 0.65rem;
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--ink);
}

.solution-steps li:last-child {
  margin-bottom: 0;
}

.solution-step-body,
.law-line-body {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.rich-text-line {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.55;
  font-family: "Segoe UI", system-ui, sans-serif;
  color: var(--ink);
}

.solution-step-body .rich-text-line {
  font-size: 0.92rem;
}

.rich-formula-block {
  margin: 0.35rem 0;
  padding: 0.4rem 0.35rem;
  text-align: center;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid rgba(20, 100, 60, 0.12);
}

.solution-step-body .rich-formula-block {
  background: rgba(255, 255, 255, 0.75);
}

.rich-line-spacer {
  min-height: 0.45rem;
}

.law-line-body .rich-text-line {
  font-size: 0.95rem;
}

.answer-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.answer-text {
  font-size: 1rem;
  font-family: "Segoe UI", system-ui, sans-serif;
  margin: 0;
}

.answer-text .rich-text-line {
  font-family: "Segoe UI", system-ui, sans-serif;
  font-size: 1rem;
}

.answer-text .rich-formula-block {
  margin: 0.5rem 0;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(0, 0, 0, 0.06);
}