/* =============================================================================
   RiApp — Sommes de Riemann et de Darboux (MPU1054, UQTR)
   Feuille de style. Couleurs institutionnelles : vert 0E8954, or DBA326, noir.
   ============================================================================= */

:root {
  --vert: #0E8954;
  --vert-fonce: #0B6E43;
  --vert-moyen: #87C4AA;
  --vert-clair: #B7DCCC;
  --or: #DBA326;
  --or-moyen: #E9C87D;
  --or-clair: #F2DFB3;
  --noir: #000000;
  --fond: #F5F4EE;
  --carte: #FFFFFF;
  --bord: #E3E1D8;
  --texte: #1C1C1A;
  --texte-2: #63625B;
  --ombre: 0 1px 2px rgba(0, 0, 0, .04), 0 6px 18px rgba(20, 40, 30, .06);
  --rayon: 10px;
  --police: "Carlito", "Calibri", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --police-math: "Latin Modern Roman", "STIX Two Text", "Cambria", "Georgia", "Times New Roman", serif;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; margin: 0; }
body {
  font: 15px/1.4 var(--police);
  color: var(--texte);
  background: var(--fond);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}
i, .math i { font-family: var(--police-math); font-style: italic; }
.math { font-family: var(--police-math); }
sub, sup { font-size: .72em; line-height: 0; }
button { font-family: inherit; }

/* ---------------------------------------------------------------- En-tête */
.entete {
  position: relative;
  flex: none;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 9px 20px 11px;
  background: #fff;
  border-bottom: 4px solid var(--or);
  z-index: 2;
}
.entete::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--vert);
}
.logo { height: 38px; width: auto; }
.titre h1 {
  margin: 0;
  font-size: 21px;
  line-height: 1.15;
  font-weight: 700;
  color: var(--vert);
  letter-spacing: .01em;
}
.sous-titre { margin: 3px 0 0; font-size: 12.5px; color: var(--texte-2); }
.actions { margin-left: auto; display: flex; gap: 8px; }

/* ---------------------------------------------------------------- Disposition */
.principal {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 390px;
  gap: 12px;
  padding: 16px 12px 12px;
}
body.sans-panneau .principal { grid-template-columns: minmax(0, 1fr); }
body.sans-panneau .panneau { display: none; }

.zone-graphe {
  position: relative;
  min-width: 0;
  min-height: 0;
  background: #fff;
  border: 1px solid var(--bord);
  border-radius: var(--rayon);
  box-shadow: var(--ombre);
  overflow: hidden;
}
#graphe {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: grab;
  user-select: none;
  outline: none;
}
#graphe.glisse { cursor: grabbing; }
#graphe.poignee { cursor: ew-resize; }

.panneau {
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-right: 2px;
  scrollbar-width: thin;
  scrollbar-color: #CFCDC4 transparent;
}

/* ---------------------------------------------------------------- Cartes */
.carte {
  background: var(--carte);
  border: 1px solid var(--bord);
  border-radius: var(--rayon);
  padding: 12px 14px 13px;
  box-shadow: var(--ombre);
}
.carte h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 9px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--vert);
}
.carte h2 .math { text-transform: none; letter-spacing: 0; font-size: 14px; font-weight: 400; color: var(--texte); }
.carte h2::after { content: ""; flex: 1; height: 1px; background: var(--bord); }
.carte h2 i { text-transform: none; letter-spacing: 0; }

.rangee { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.rangee.entre { justify-content: space-between; }
.rangee.droite { justify-content: flex-end; margin-top: 14px; }
.rangee.sous { margin-top: 7px; }
.groupe-btn { display: flex; gap: 5px; }
.indice { margin: 7px 0 0; font-size: 12.5px; color: var(--texte-2); line-height: 1.35; }
.rangee .indice { margin: 0; }
.note { font-size: 12px; color: var(--texte-2); font-family: var(--police); font-style: normal; }
.formule {
  margin-top: 9px;
  font-family: var(--police-math);
  font-size: 17px;
  color: var(--texte);
  min-height: 1.3em;
}
.erreur { flex-basis: 100%; font-size: 12.5px; color: #8A2B1E; }
.perso { margin-top: 8px; }
.perso #expr { flex: 1; font-family: "Latin Modern Mono", Consolas, Menlo, monospace; }

/* ---------------------------------------------------------------- Contrôles */
.seg {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  padding: 3px;
  background: #EFEEE7;
  border-radius: 8px;
}
.seg button {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  background: transparent;
  border-radius: 6px;
  padding: 6px 9px;
  font-size: 14px;
  color: var(--texte);
  cursor: pointer;
  white-space: nowrap;
  transition: background .12s;
}
.seg button:hover { background: #fff; }
.seg button[aria-pressed="true"] {
  background: var(--or);
  color: #000;
  font-weight: 700;
  box-shadow: 0 1px 2px rgba(0, 0, 0, .18);
}
.seg button .math { font-size: 15px; }

.btn {
  border: 1px solid var(--bord);
  background: #fff;
  color: var(--texte);
  border-radius: 8px;
  padding: 6px 11px;
  font-size: 14px;
  line-height: 1.2;
  cursor: pointer;
  transition: border-color .12s, background .12s;
  white-space: nowrap;
}
.btn:hover { border-color: var(--vert); background: #F6FBF8; }
.btn.primaire { background: var(--vert); color: #fff; border-color: var(--vert); }
.btn.primaire:hover { background: var(--vert-fonce); border-color: var(--vert-fonce); }
.btn.petit { padding: 4px 9px; font-size: 13px; }
.btn:disabled { opacity: .45; cursor: default; }
.btn.actif { background: var(--or); border-color: var(--or); color: #000; }

input[type="number"], input[type="text"], select {
  font: inherit;
  font-size: 14px;
  padding: 5px 8px;
  border: 1px solid var(--bord);
  border-radius: 7px;
  background: #fff;
  color: var(--texte);
  min-width: 0;
}
input[type="number"] { width: 5.6em; font-variant-numeric: tabular-nums; }
.champ { display: inline-flex; align-items: center; gap: 6px; }
.champ .math { font-size: 16px; }
input:focus-visible, select:focus-visible, button:focus-visible { outline: 2px solid var(--or); outline-offset: 1px; }
input[type="range"] { width: 100%; margin: 10px 0 9px; accent-color: var(--vert); }

/* Interrupteurs */
.bascule {
  position: relative;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 4px 0;
  cursor: pointer;
  font-size: 14.5px;
}
.bascule input { position: absolute; opacity: 0; pointer-events: none; }
.glissiere {
  flex: none;
  width: 34px; height: 20px;
  border-radius: 10px;
  background: #D6D4CB;
  position: relative;
  transition: background .15s;
}
.glissiere::after {
  content: "";
  position: absolute;
  top: 2px; left: 2px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, .25);
  transition: left .15s;
}
.bascule input:checked + .glissiere { background: var(--vert); }
.bascule input:checked + .glissiere::after { left: 16px; }
.bascule input:focus-visible + .glissiere { outline: 2px solid var(--or); outline-offset: 1px; }

.pastille { flex: none; width: 14px; height: 14px; border-radius: 3px; border: 1px solid transparent; }
.pastille.S { background: var(--or-clair); border-color: #000; }
.pastille.L { background: var(--vert-clair); border-color: var(--vert-moyen); }
.pastille.U { background: var(--or-clair); border-color: var(--or-moyen); }
.pastille-inline { display: inline-block; vertical-align: -2px; }
.formule-somme {
  margin: -3px 0 5px 57px;
  font-size: 13px;
  color: var(--texte-2);
  font-family: var(--police-math);
}
.options { margin-top: 8px; gap: 6px 14px; }
.case { display: inline-flex; align-items: center; gap: 5px; font-size: 13.5px; cursor: pointer; }
.case input { accent-color: var(--vert); margin: 0; }
.case select { padding: 2px 4px; font-size: 13px; }

/* ---------------------------------------------------------------- Valeurs */
.valeurs {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3px 14px;
  align-items: baseline;
  margin: 0;
  font-size: 15px;
}
.valeurs dt { display: flex; align-items: center; gap: 7px; font-family: var(--police-math); white-space: nowrap; }
.valeurs dd {
  margin: 0;
  text-align: right;
  font-size: 16px;
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}
.valeurs dd.accent { font-weight: 700; color: var(--vert-fonce); }
.valeurs dd.inactif { color: #B5B3AA; }
.integrale { font-size: 18px; line-height: 1; }
.avertissement {
  margin-top: 9px;
  padding: 6px 9px;
  font-size: 13px;
  background: var(--or-clair);
  border-left: 3px solid var(--or);
  border-radius: 4px;
}
.encadrement { margin-top: 10px; }
.encadrement svg { display: block; width: 100%; height: auto; overflow: visible; }

/* ---------------------------------------------------------------- Tableau */
.tableau-conteneur { overflow: auto; max-height: 280px; }
table.tableau {
  border-collapse: collapse;
  width: 100%;
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
}
.tableau th, .tableau td {
  padding: 3px 6px;
  text-align: right;
  border-bottom: 1px solid var(--bord);
  white-space: nowrap;
}
.tableau th {
  position: sticky; top: 0;
  background: #fff;
  color: var(--vert);
  font-weight: 700;
  font-family: var(--police-math);
  font-style: italic;
}
.tableau tr:hover td, .tableau tr.survol td { background: var(--or-clair); }

/* ---------------------------------------------------------------- Aide */
dialog {
  border: 0;
  border-radius: 12px;
  padding: 0;
  max-width: 680px;
  width: calc(100% - 40px);
  color: var(--texte);
  box-shadow: 0 20px 60px rgba(0, 0, 0, .28);
}
dialog::backdrop { background: rgba(20, 30, 25, .45); }
.aide-corps { padding: 18px 24px 20px; border-top: 5px solid var(--or); }
dialog h2 { margin: 0 0 8px; color: var(--vert); font-size: 19px; }
dialog h3 { margin: 14px 0 5px; font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--texte-2); }
dialog ul { margin: 0; padding-left: 18px; }
dialog li { margin: 3px 0; line-height: 1.4; }
dialog code { font-family: "Latin Modern Mono", Consolas, Menlo, monospace; font-size: 13px; background: #F1F0EA; padding: 0 4px; border-radius: 3px; }
kbd {
  font: 12px var(--police);
  background: #F1F0EA;
  border: 1px solid var(--bord);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 6px;
}
.pied { margin: 2px 0 4px; font-size: 12px; color: var(--texte-2); text-align: center; }

/* Résultats des tests (index.html?test=1) */
#tests {
  position: fixed; left: 12px; bottom: 12px; z-index: 10;
  max-height: 60vh; overflow: auto;
  margin: 0; padding: 10px 14px;
  background: rgba(255, 255, 255, .96);
  border: 1px solid var(--bord); border-radius: 8px;
  font: 12.5px/1.45 "Latin Modern Mono", Consolas, Menlo, monospace;
  box-shadow: var(--ombre);
  white-space: pre-wrap;
  max-width: 46vw;
}

/* ---------------------------------------------------------------- Écrans étroits */
@media (max-width: 900px) {
  .principal { grid-template-columns: 1fr; grid-template-rows: minmax(320px, 1fr) auto; }
  .panneau { max-height: 46vh; }
  .sous-titre { display: none; }
}

/* Bouton de langue (EN / FR) */
.btn.langue { font-weight: 700; letter-spacing: .04em; border-color: var(--or); min-width: 3em; }
.btn.langue:hover { background: var(--or-clair); }