.math-calculator {
  --calc-ink: #142033;
  --calc-muted: #718096;
  --calc-line: #d8e0eb;
  --calc-screen: #f7f9fc;
  --calc-panel: #ffffff;
  --calc-key: #fbfcfe;
  --calc-key-hover: #edf2fa;
  --calc-accent: #315bd6;
  --calc-accent-dark: #2446ac;
  --calc-success: #167254;
  --calc-danger: #aa3f4e;
  box-sizing: border-box;
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 2rem);
  color: var(--calc-ink);
  background: #eef2f7;
  border: 1px solid var(--calc-line);
  border-radius: 22px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  box-shadow: 0 22px 65px rgba(30, 48, 83, 0.14);
}

.math-calculator *,
.math-calculator *::before,
.math-calculator *::after {
  box-sizing: inherit;
}

.math-calculator button {
  font: inherit;
}

.math-calculator__header,
.calculator-screen__toolbar,
.calculator-controls,
.history-panel__heading,
.explanation-panel__heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.math-calculator__header {
  margin-bottom: 1rem;
}

.math-calculator__eyebrow,
.calculator-screen__label {
  color: var(--calc-muted);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.math-calculator__eyebrow {
  margin: 0 0 0.3rem;
  color: var(--calc-accent);
}

.math-calculator h2,
.math-calculator h3,
.math-calculator p {
  margin-top: 0;
}

.math-calculator h2 {
  margin-bottom: 0;
  font-size: clamp(1.3rem, 2.3vw, 1.8rem);
  letter-spacing: -0.025em;
}

.math-calculator h3 {
  margin-bottom: 0;
  font-size: 1rem;
}

.math-calculator__status {
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  background: #e7f5ee;
  color: var(--calc-success);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.math-calculator__status[data-state="busy"] {
  background: #e8efff;
  color: var(--calc-accent-dark);
}

.math-calculator__status[data-state="error"] {
  background: #fbedef;
  color: var(--calc-danger);
}

.math-calculator__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 0.34fr);
  gap: 1rem;
  align-items: start;
}

.math-calculator__main,
.history-panel,
.explanation-panel {
  min-width: 0;
  padding: clamp(0.85rem, 2vw, 1.25rem);
  background: var(--calc-panel);
  border: 1px solid var(--calc-line);
  border-radius: 17px;
}

.calculator-screen {
  overflow: hidden;
  background: var(--calc-screen);
  border: 1px solid #cbd5e3;
  border-radius: 15px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.calculator-screen__toolbar {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--calc-line);
}

.calculator-screen__mode,
.calculator-screen__state {
  color: var(--calc-muted);
  font-size: 0.72rem;
  font-weight: 750;
}

.calculator-screen__state {
  color: var(--calc-success);
}

.calculator-screen__expression,
.calculator-screen__result {
  padding: 1rem;
}

.calculator-screen__expression {
  border-bottom: 1px solid var(--calc-line);
}

.calculator-screen__label {
  display: block;
  margin-bottom: 0.6rem;
}

.math-editor {
  display: block;
  width: 100%;
  min-height: 5.8rem;
  padding: 0.8rem 0.95rem;
  overflow: auto;
  background: #fff;
  border: 1px solid #b9c6d9;
  border-radius: 11px;
  color: var(--calc-ink);
  font-family: "STIX Two Text", "Cambria Math", "Latin Modern Math", serif;
  font-size: clamp(1.55rem, 4vw, 2.3rem);
  line-height: 1.4;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.math-editor:focus-within {
  border-color: var(--calc-accent);
  box-shadow: 0 0 0 4px rgba(49, 91, 214, 0.13);
  outline: none;
}

.math-result__text {
  min-height: 1.5rem;
  margin: 0 0 0.55rem;
  color: var(--calc-ink);
  font-size: 1rem;
  font-weight: 650;
  line-height: 1.45;
  white-space: pre-wrap;
}

.math-result__formula {
  min-height: 2.3rem;
  overflow-x: auto;
  color: #101827;
  font-family: "STIX Two Text", "Cambria Math", "Latin Modern Math", serif;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
}

.math-result__fallback {
  margin: 0;
  color: var(--calc-muted);
  font-size: 0.82rem;
}

.calculator-controls {
  flex-wrap: wrap;
  margin-top: 0.85rem;
}

.calculator-controls__editing,
.calculator-controls__primary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.calculator-button,
.keypad__tab,
.keypad__panel button,
.history-panel__clear {
  border: 1px solid var(--calc-line);
  border-radius: 9px;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

.calculator-button:hover:not(:disabled),
.keypad__panel button:hover,
.keypad__tab:hover,
.history-panel__clear:hover {
  transform: translateY(-1px);
}

.calculator-button:focus-visible,
.keypad__tab:focus-visible,
.keypad__panel button:focus-visible,
.history-panel__clear:focus-visible,
.history-item__restore:focus-visible {
  outline: 3px solid rgba(49, 91, 214, 0.25);
  outline-offset: 2px;
}

.calculator-button {
  min-height: 2.65rem;
  padding: 0.65rem 0.95rem;
  font-size: 0.86rem;
  font-weight: 800;
}

.calculator-button--utility {
  min-width: 2.65rem;
  padding-inline: 0.65rem;
  background: #f7f9fc;
  color: #40516c;
  font-size: 1rem;
}

.calculator-button--primary {
  background: var(--calc-accent);
  border-color: var(--calc-accent);
  color: #fff;
}

.calculator-button--primary:hover:not(:disabled) {
  background: var(--calc-accent-dark);
}

.calculator-button--secondary {
  background: #fff;
  color: var(--calc-accent-dark);
}

.calculator-button:disabled {
  cursor: wait;
  opacity: 0.55;
}

.math-calculator__message {
  min-height: 1.35rem;
  margin: 0.75rem 0 0;
  color: var(--calc-muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.math-calculator__message[data-state="error"] {
  color: var(--calc-danger);
}

.math-calculator__message[data-state="success"] {
  color: var(--calc-success);
}

.keypad {
  margin-top: 0.8rem;
}

.keypad__tabs {
  display: flex;
  gap: 0.35rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.keypad__tab {
  flex: 0 0 auto;
  min-height: 2.3rem;
  padding: 0.5rem 0.7rem;
  background: #eef2f8;
  color: #53627a;
  font-size: 0.78rem;
  font-weight: 800;
}

.keypad__tab.is-active {
  background: #dce6ff;
  border-color: #a9bce9;
  color: var(--calc-accent-dark);
}

.keypad__panels {
  padding: 0.7rem;
  background: #f4f6fa;
  border: 1px solid var(--calc-line);
  border-radius: 13px;
}

.keypad__panel {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.42rem;
}

.keypad__panel[hidden] {
  display: none;
}

.keypad__panel button {
  min-height: 2.65rem;
  padding: 0.45rem;
  overflow: hidden;
  background: var(--calc-key);
  color: var(--calc-ink);
  font-family: "STIX Two Text", "Cambria Math", serif;
  font-size: 1.05rem;
  font-weight: 650;
}

.keypad__panel button:hover {
  background: var(--calc-key-hover);
  border-color: #b3c1d6;
}

.keypad__panel .keypad__operator {
  background: #e8efff;
  border-color: #c4d1f1;
  color: var(--calc-accent-dark);
}

.history-panel {
  position: sticky;
  top: 1rem;
}

.history-panel__heading {
  align-items: flex-start;
  margin-bottom: 0.8rem;
}

.history-panel__heading h3 {
  margin-top: 0.25rem;
}

.history-panel__clear {
  padding: 0.35rem 0.55rem;
  background: #fff;
  color: var(--calc-muted);
  font-size: 0.72rem;
  font-weight: 750;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-height: 34rem;
  margin: 0;
  padding: 0;
  overflow: auto;
  list-style: none;
}

.history-list__empty {
  padding: 1.25rem 0.7rem;
  color: var(--calc-muted);
  font-size: 0.82rem;
  text-align: center;
}

.history-item {
  padding: 0.7rem;
  background: #f8fafc;
  border: 1px solid #e0e6ef;
  border-radius: 11px;
}

.history-item__formula {
  min-height: 1.8rem;
  overflow-x: auto;
  font-family: "STIX Two Text", "Cambria Math", serif;
  font-size: 1.05rem;
}

.history-item__mathfield {
  display: block;
  width: 100%;
  color: var(--calc-ink);
  font-size: 1.05rem;
}

.history-item__result {
  margin: 0.45rem 0 0.55rem;
  color: var(--calc-muted);
  font-size: 0.8rem;
  line-height: 1.35;
  white-space: pre-wrap;
}

.history-item__restore {
  padding: 0.3rem 0.5rem;
  background: #fff;
  border: 1px solid #cbd6e5;
  border-radius: 7px;
  color: var(--calc-accent-dark);
  cursor: pointer;
  font-size: 0.72rem;
  font-weight: 750;
}

.explanation-panel {
  margin-top: 1rem;
}

.explanation-panel__heading {
  align-items: flex-start;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 0.7rem;
}

.explanation-panel__body {
  color: #36445c;
  font-size: 0.92rem;
  line-height: 1.65;
  white-space: pre-wrap;
}

@media (max-width: 820px) {
  .math-calculator__layout {
    grid-template-columns: 1fr;
  }

  .history-panel {
    position: static;
  }

  .history-list {
    max-height: 16rem;
  }
}

@media (max-width: 520px) {
  .math-calculator {
    padding: 0.75rem;
    border-radius: 15px;
  }

  .math-calculator__header {
    align-items: flex-start;
    flex-direction: column;
  }

  .calculator-controls {
    align-items: stretch;
    flex-direction: column;
  }

  .calculator-controls__primary,
  .calculator-controls__editing {
    justify-content: stretch;
  }

  .calculator-controls__primary .calculator-button {
    flex: 1;
  }

  .keypad__panels {
    padding: 0.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .calculator-button,
  .keypad__tab,
  .keypad__panel button,
  .history-panel__clear {
    transition: none;
  }
}

/* Ajustement de lisibilité de l'écran Expression en cours */
.math-calculator #mathEditor {
  display: block;
  width: 100%;
  min-height: 288px;
  max-height: 420px;
  box-sizing: border-box;
  padding: 18px 20px;
  font-size: 1.15rem;
  line-height: 1.55;
  overflow-y: auto;
}

/* Le conteneur conserve une hauteur minimale correspondant à six lignes */
.math-calculator [data-editor-panel],
.math-calculator .calculator__editor,
.math-calculator .math-editor,
.math-calculator .display-editor {
  min-height: 320px;
}

/* Réduction légère des caractères dans l'écran de saisie */
.math-calculator #mathEditor::part(content),
.math-calculator #mathEditor::part(container) {
  font-size: 1.15rem;
  line-height: 1.55;
}

@media (max-width: 700px) {
  .math-calculator #mathEditor {
    min-height: 260px;
    font-size: 1.05rem;
    padding: 14px 16px;
  }
}

/* Nettoyage de l'interface utilisateur */
.math-calculator [data-operation-detected],
.math-calculator [data-result-state],
.math-calculator [data-workspace-status],
.math-calculator .workspace-status,
.math-calculator .status-pill {
  display: none !important;
}

/* Correction V3, symboles et claviers */
.math-calculator .keypad__panel {
  display: grid;
  grid-template-columns: repeat(4, minmax(58px, 1fr));
  gap: 8px;
  align-items: stretch;
  padding: 12px;
  box-sizing: border-box;
  overflow: visible;
}

.math-calculator .keypad__panel[hidden] {
  display: none !important;
}

.math-calculator .keypad__panel > button {
  min-width: 0;
  min-height: 44px;
  height: auto;
  padding: 8px 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  box-sizing: border-box;
}

.math-calculator .keypad__panel > button[data-latex="\\int"],
.math-calculator .keypad__panel > button[data-latex="\\int_{#@}^{#?}"] {
  font-family: "STIX Two Math", "Cambria Math", "DejaVu Serif", serif;
  font-size: 1.45rem;
}

.math-calculator .keypad__panel > button[data-latex="\\sum_{#@}^{#?}"],
.math-calculator .keypad__panel > button[data-latex="\\prod_{#@}^{#?}"] {
  font-family: "STIX Two Math", "Cambria Math", "DejaVu Serif", serif;
  font-size: 1.35rem;
}

.site-header [role="menu"],
.site-header .menu {
  min-width: 220px;
  max-width: min(320px, calc(100vw - 24px));
  padding: 8px 0;
  overflow: visible;
}

.site-header [role="menuitem"],
.site-header .menu button,
.site-header .menu a {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  width: 100%;
  padding: 8px 16px;
  line-height: 1.3;
  white-space: normal;
  overflow-wrap: anywhere;
}

@media (max-width: 700px) {
  .math-calculator .keypad__panel {
    grid-template-columns: repeat(4, minmax(48px, 1fr));
    gap: 6px;
    padding: 8px;
  }

  .math-calculator .keypad__panel > button {
    min-height: 40px;
    padding: 6px;
  }
}


/* Présentation des titres et suppression du doublon */
.app-main .compact-heading h2 {
  color: #6161ff;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.82rem;
  font-weight: 700;
}

.app-main #full-answer-title {
  display: none !important;
}