/* ============================================================================
   (les ajouts plateforme — auth, nav utilisateur, tableau de bord, admin —
    se trouvent à la fin de ce fichier)
   ============================================================================ */

/* ============================================================================
   MATHE2 – Tableur interactif : feuille de style
   Conçue pour être lisible en classe (projection / partage d'écran) :
   contrastes nets, typographie généreuse, couleurs sobres.
   ========================================================================== */

:root {
  --bleu: #1f4e79; /* bleu institutionnel (cf. mathe2style.sty) */
  --bleu-clair: #e8f0f8;
  --bleu-vif: #2e75b6;
  --rouge: #c00000;
  --vert: #1e7d34;
  --vert-clair: #e6f4ea;
  --rouge-clair: #fdecea;
  --gris: #595959;
  --gris-clair: #f4f6f9;
  --gris-bord: #d9dee6;
  --jaune: #fff3cd;
  --ombre: 0 2px 8px rgba(31, 78, 121, 0.1);
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    "Segoe UI",
    system-ui,
    -apple-system,
    Roboto,
    Arial,
    sans-serif;
  color: #1c2733;
  background: var(--gris-clair);
  line-height: 1.55;
  font-size: 17px;
}

/* ---------- En-tête + navigation ---------- */
.site-header {
  background: linear-gradient(120deg, var(--bleu) 0%, var(--bleu-vif) 100%);
  color: #fff;
  padding: 18px 0;
  box-shadow: var(--ombre);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.site-header h1 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 600;
}
.site-header .subtitle {
  opacity: 0.9;
  font-size: 0.95rem;
}
.site-header a {
  color: #fff;
}
.topnav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}
.topnav a {
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  white-space: nowrap;
}
.topnav a:hover,
.topnav a.active {
  background: rgba(255, 255, 255, 0.18);
}

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
}
main.wrap {
  padding-top: 28px;
  padding-bottom: 60px;
}

/* ---------- Titres ---------- */
h2.section {
  color: var(--bleu);
  border-bottom: 3px solid var(--bleu-clair);
  padding-bottom: 8px;
  margin-top: 44px;
  font-size: 1.55rem;
}
h3.sub {
  color: var(--bleu-vif);
  margin-top: 28px;
  font-size: 1.2rem;
}
h4 {
  color: var(--gris);
  margin: 18px 0 8px;
}

/* ---------- Carte / encadrés ---------- */
.card {
  background: #fff;
  border: 1px solid var(--gris-bord);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin: 18px 0;
  box-shadow: var(--ombre);
}
.callout {
  border-left: 5px solid var(--bleu-vif);
  background: var(--bleu-clair);
  padding: 14px 18px;
  border-radius: 8px;
  margin: 16px 0;
}
.callout.astuce {
  border-color: var(--vert);
  background: var(--vert-clair);
}
.callout.regle {
  border-color: var(--rouge);
  background: var(--rouge-clair);
}
.callout .label {
  font-weight: 700;
  display: block;
  margin-bottom: 4px;
}
.callout.astuce .label {
  color: var(--vert);
}
.callout.regle .label {
  color: var(--rouge);
}
.callout .label::before {
  margin-right: 6px;
}
.callout.astuce .label::before {
  content: "💡";
}
.callout.regle .label::before {
  content: "⚠️";
}

/* code / formules inline */
code,
.formule {
  font-family: "Cascadia Code", "Consolas", "SF Mono", monospace;
  background: #2b2b2b;
  color: #f8f8f2;
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 0.92em;
}
.formule-bloc {
  display: block;
  padding: 12px 16px;
  margin: 8px 0;
  white-space: pre;
  line-height: 1.7;
}

/* ---------- Tableaux de référence (théorie) ---------- */
table.ref {
  border-collapse: collapse;
  width: 100%;
  margin: 14px 0;
  background: #fff;
  font-size: 0.96rem;
}
table.ref th {
  background: var(--bleu);
  color: #fff;
  text-align: left;
  padding: 10px 12px;
}
table.ref td {
  border: 1px solid var(--gris-bord);
  padding: 9px 12px;
  vertical-align: top;
}
table.ref tr:nth-child(even) td {
  background: var(--gris-clair);
}

/* ============================================================================
   Mini-tableur interactif (spreadsheet.js)
   ========================================================================== */
.ssheet-wrap {
  overflow-x: auto;
  margin: 14px 0;
}
table.ssheet {
  border-collapse: collapse;
  font-size: 0.95rem;
  background: #fff;
}
table.ssheet th,
table.ssheet td {
  border: 1px solid #c6cdd6;
  padding: 6px 10px;
  min-width: 64px;
  height: 30px;
  text-align: left;
}
table.ssheet th {
  background: #eef1f6;
  color: var(--gris);
  text-align: center;
  font-weight: 600;
}
table.ssheet .ss-corner {
  background: #dde3ec;
  min-width: 34px;
}
table.ssheet .ss-rowhead {
  background: #eef1f6;
  text-align: center;
  min-width: 34px;
}
table.ssheet td.ss-num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}
table.ssheet td.ss-formula {
  background: #f3f8ff;
}
table.ssheet td.ss-highlight {
  background: var(--jaune);
  outline: 2px solid #f0c000;
}
table.ssheet td.ss-error {
  color: var(--rouge);
  font-weight: 600;
}
table.ssheet td:focus {
  outline: 2px solid var(--bleu-vif);
}
.ss-input {
  width: 100%;
  border: none;
  font: inherit;
  padding: 0;
  background: transparent;
}
.ss-input:focus {
  outline: none;
}

/* ============================================================================
   Exercices interactifs
   ========================================================================== */
.exo {
  background: #fff;
  border: 1px solid var(--gris-bord);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 22px 0;
  box-shadow: var(--ombre);
}
.exo-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}
.exo-head .num {
  background: var(--bleu);
  color: #fff;
  font-weight: 700;
  border-radius: 6px;
  padding: 3px 11px;
  font-size: 0.9rem;
}
.exo-head h3 {
  margin: 0;
  color: var(--bleu);
  font-size: 1.18rem;
}
.exo .consigne {
  color: #333;
}
.exo .badge-state {
  margin-left: auto;
  font-size: 0.85rem;
  padding: 2px 10px;
  border-radius: 20px;
  font-weight: 600;
}
.badge-state.ok {
  background: var(--vert-clair);
  color: var(--vert);
}
.badge-state.ko {
  background: var(--rouge-clair);
  color: var(--rouge);
}

.question {
  margin: 16px 0;
  padding-top: 12px;
  border-top: 1px dashed var(--gris-bord);
}
.question:first-of-type {
  border-top: none;
}
.question .q-text {
  font-weight: 600;
  margin-bottom: 8px;
}
.question .q-text .pt {
  color: var(--gris);
  font-weight: 400;
  font-size: 0.85rem;
}

/* champ formule */
.answer-row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}
input.fx,
textarea.fx {
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 1rem;
  padding: 9px 12px;
  border: 2px solid var(--gris-bord);
  border-radius: 7px;
  min-width: 280px;
  flex: 1;
}
input.fx:focus,
textarea.fx:focus {
  outline: none;
  border-color: var(--bleu-vif);
}
input.fx.ok {
  border-color: var(--vert);
  background: var(--vert-clair);
}
input.fx.ko {
  border-color: var(--rouge);
  background: var(--rouge-clair);
}

/* QCM */
.choices {
  display: grid;
  gap: 8px;
  margin: 6px 0;
}
.choice {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 2px solid var(--gris-bord);
  border-radius: 8px;
  cursor: pointer;
  background: #fff;
  transition: 0.12s;
}
.choice:hover {
  border-color: var(--bleu-vif);
  background: var(--bleu-clair);
}
.choice.selected {
  border-color: var(--bleu-vif);
  background: var(--bleu-clair);
}
.choice.ok {
  border-color: var(--vert);
  background: var(--vert-clair);
}
.choice.ko {
  border-color: var(--rouge);
  background: var(--rouge-clair);
}
.choice input {
  width: 18px;
  height: 18px;
}

/* boutons */
.btn {
  background: var(--bleu-vif);
  color: #fff;
  border: none;
  padding: 9px 18px;
  border-radius: 7px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: 0.12s;
}
.btn:hover {
  background: var(--bleu);
}
.btn.ghost {
  background: #fff;
  color: var(--bleu-vif);
  border: 2px solid var(--bleu-vif);
}
.btn.ghost:hover {
  background: var(--bleu-clair);
}
.btn.small {
  padding: 5px 12px;
  font-size: 0.88rem;
}

.feedback {
  margin-top: 10px;
  padding: 10px 14px;
  border-radius: 7px;
  font-weight: 500;
  display: none;
}
.feedback.show {
  display: block;
}
.feedback.ok {
  background: var(--vert-clair);
  color: var(--vert);
  border-left: 4px solid var(--vert);
}
.feedback.ko {
  background: var(--rouge-clair);
  color: var(--rouge);
  border-left: 4px solid var(--rouge);
}
.feedback .sol {
  display: block;
  margin-top: 6px;
  color: #333;
  font-weight: 400;
}

.solution {
  margin-top: 12px;
  padding: 12px 16px;
  background: var(--gris-clair);
  border-radius: 7px;
  border-left: 4px solid var(--gris);
  display: none;
}
.solution.show {
  display: block;
}

/* ---------- Sommaire / progression ---------- */
.toc {
  position: sticky;
  top: 12px;
}
.layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.progress-bar {
  height: 10px;
  background: var(--gris-bord);
  border-radius: 6px;
  overflow: hidden;
  margin: 8px 0 0;
}
.progress-bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--vert), #34c759);
  width: 0;
  transition: width 0.4s;
}

/* ---------- Page d'accueil ---------- */
.hero {
  text-align: center;
  padding: 40px 0 10px;
}
.hero h1 {
  color: var(--bleu);
  font-size: 2.1rem;
  margin: 0 0 8px;
}
.hero p {
  color: var(--gris);
  font-size: 1.15rem;
  max-width: 680px;
  margin: 0 auto;
}
.chapters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
  margin: 36px 0;
}
.chap-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: #fff;
  border: 1px solid var(--gris-bord);
  border-radius: 14px;
  padding: 26px;
  box-shadow: var(--ombre);
  transition: 0.15s;
  border-top: 5px solid var(--bleu-vif);
}
.chap-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 22px rgba(31, 78, 121, 0.18);
}
.chap-card .tag {
  display: inline-block;
  background: var(--bleu-clair);
  color: var(--bleu);
  font-weight: 700;
  padding: 3px 12px;
  border-radius: 20px;
  font-size: 0.82rem;
}
.chap-card h2 {
  color: var(--bleu);
  margin: 12px 0 6px;
}
.chap-card .pts {
  color: var(--gris);
  font-size: 0.9rem;
}
.chap-card ul {
  margin: 12px 0 0;
  padding-left: 20px;
  color: #444;
  font-size: 0.95rem;
}

ol.steps {
  margin: 12px 0;
  padding-left: 22px;
}
ol.steps li {
  margin: 6px 0;
}

/* ---------- Graphiques C4 ---------- */
.chart-box {
  background: #fff;
  border: 1px solid var(--gris-bord);
  border-radius: 10px;
  padding: 16px;
  margin: 14px 0;
}
.chart-box canvas {
  max-height: 340px;
}
.chooser-tools {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 10px 0;
}

/* ---------- Liens vers exemples (théorie interactive) ---------- */
.try-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bleu-clair);
  color: var(--bleu);
  text-decoration: none;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.9rem;
  border: 1px solid #cfe0f0;
}
.try-link:hover {
  background: var(--bleu-vif);
  color: #fff;
}
.try-link::before {
  content: "▶";
  font-size: 0.8em;
}

/* ---------- Téléchargements ---------- */
.dl-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 10px 0;
}
.dl {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border: 1px solid var(--gris-bord);
  border-radius: 8px;
  padding: 8px 14px;
  text-decoration: none;
  color: var(--bleu);
  font-weight: 600;
}
.dl:hover {
  background: var(--bleu-clair);
}

footer.site {
  text-align: center;
  color: var(--gris);
  padding: 30px 20px;
  font-size: 0.9rem;
  border-top: 1px solid var(--gris-bord);
  background: #fff;
}

@media (min-width: 880px) {
  .layout.with-toc {
    grid-template-columns: 220px 1fr;
  }
}
@media print {
  .topnav,
  .btn,
  .try-link {
    display: none;
  }
  .exo,
  .card {
    box-shadow: none;
    break-inside: avoid;
  }
}

/* ============================================================================
   PLATEFORME : authentification, barre utilisateur, tableau de bord, admin
   ========================================================================== */

/* --- barre utilisateur dans la nav --- */
#user-slot {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-left: 6px;
  padding-left: 12px;
  border-left: 1px solid rgba(255, 255, 255, 0.4);
}
.nav-user {
  color: #fff;
  font-weight: 600;
  opacity: 0.95;
}
.nav-logout,
.nav-admin {
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.35);
}
.nav-logout:hover,
.nav-admin:hover {
  background: rgba(255, 255, 255, 0.18);
}

/* --- formulaires de connexion / inscription --- */
.auth-card {
  max-width: 460px;
  margin: 0 auto 30px;
}
.auth-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
}
.auth-tab {
  flex: 1;
  padding: 10px;
  border: none;
  background: var(--gris-clair);
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  color: var(--gris);
  cursor: pointer;
}
.auth-tab.active {
  background: var(--bleu);
  color: #fff;
}
.auth-form {
  display: grid;
  gap: 14px;
}
.auth-form label {
  display: grid;
  gap: 5px;
  font-weight: 600;
  color: #333;
  font-size: 0.95rem;
}
.auth-form input {
  padding: 10px 12px;
  border: 2px solid var(--gris-bord);
  border-radius: 7px;
  font: inherit;
}
.auth-form input:focus {
  outline: none;
  border-color: var(--bleu-vif);
}
.auth-form .btn {
  margin-top: 4px;
}
.auth-msg {
  min-height: 1.2em;
  font-size: 0.92rem;
}
.auth-msg.err {
  color: var(--rouge);
}
.auth-msg.ok {
  color: var(--vert);
}

/* --- tableau de bord élève --- */
.dash-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin: 18px 0;
}
.dash-card {
  background: #fff;
  border: 1px solid var(--gris-bord);
  border-radius: 12px;
  padding: 20px;
  box-shadow: var(--ombre);
}
.dash-card h3 {
  margin: 0 0 6px;
  color: var(--bleu);
}
.ring {
  --p: 0;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  margin: 6px auto;
  display: grid;
  place-items: center;
  background:
    radial-gradient(closest-side, #fff 78%, transparent 79%),
    conic-gradient(var(--vert) calc(var(--p) * 1%), var(--gris-bord) 0);
}
.ring b {
  font-size: 1.3rem;
  color: var(--bleu);
}
.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.badge {
  background: var(--bleu-clair);
  color: var(--bleu);
  padding: 5px 12px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.85rem;
}
.badge.locked {
  background: var(--gris-clair);
  color: #aaa;
}

/* --- onglets (théorie Cours/Exemples, exercices Entraînement/Évaluation) --- */
.tabs {
  display: flex;
  gap: 6px;
  border-bottom: 2px solid var(--gris-bord);
  margin: 8px 0 18px;
  flex-wrap: wrap;
}
.tab-btn {
  padding: 9px 18px;
  border: none;
  background: transparent;
  font: inherit;
  font-weight: 600;
  color: var(--gris);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
}
.tab-btn.active {
  color: var(--bleu);
  border-bottom-color: var(--bleu);
}
.tab-pane {
  display: none;
}
.tab-pane.active {
  display: block;
}

/* --- exemple « après chaque formule » --- */
.example {
  border-left: 4px solid var(--vert);
  background: var(--vert-clair);
  border-radius: 8px;
  padding: 14px 18px;
  margin: 14px 0;
}
.example .ex-title {
  font-weight: 700;
  color: var(--vert);
  margin-bottom: 6px;
}
.example .formule {
  display: inline-block;
  margin: 6px 0;
}

/* --- examen chronométré --- */
.exam-timer {
  position: sticky;
  top: 8px;
  z-index: 20;
  background: var(--bleu);
  color: #fff;
  padding: 10px 18px;
  border-radius: 10px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--ombre);
}
.exam-timer.warn {
  background: var(--rouge);
}

/* --- admin --- */
.admin-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin: 16px 0;
}
.stat {
  background: #fff;
  border: 1px solid var(--gris-bord);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
}
.stat .n {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--bleu);
}
.stat .l {
  color: var(--gris);
  font-size: 0.85rem;
}
table.admin {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  font-size: 0.94rem;
}
table.admin th {
  background: var(--bleu);
  color: #fff;
  padding: 9px 10px;
  text-align: left;
  position: sticky;
  top: 0;
}
table.admin td {
  border-bottom: 1px solid var(--gris-bord);
  padding: 8px 10px;
}
table.admin tr:hover td {
  background: var(--bleu-clair);
}
.mini-bar {
  height: 8px;
  background: var(--gris-bord);
  border-radius: 5px;
  overflow: hidden;
  min-width: 90px;
  display: inline-block;
  vertical-align: middle;
}
.mini-bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--vert), #34c759);
}
.pill {
  padding: 2px 9px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}
.pill.on {
  background: var(--vert-clair);
  color: var(--vert);
}
.pill.off {
  background: var(--rouge-clair);
  color: var(--rouge);
}
.pill.stuck {
  background: #fff3cd;
  color: #7a5c00;
}
.admin-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.modal-bg {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: none;
  place-items: center;
  z-index: 50;
}
.modal-bg.show {
  display: grid;
}
.modal {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  max-width: 560px;
  width: 92%;
  max-height: 88vh;
  overflow: auto;
}
.modal h3 {
  margin-top: 0;
  color: var(--bleu);
}
.code-box {
  font-family: monospace;
  font-size: 1.1rem;
  background: var(--bleu-clair);
  padding: 8px 14px;
  border-radius: 8px;
  display: inline-block;
}

/* --- clic-référence façon Excel --- */
table.ssheet td.ss-picking { background: #cfe5ff !important; outline: 2px solid var(--bleu-vif); }
.ss-pickable td[data-ref] { cursor: cell; }
.pick-hint { color: var(--gris); font-size: .85rem; margin: 4px 0 0; }

/* ============================================================================
   Présentation « Cours » pas à pas (presentation.js) — pensé pour projeter
   ========================================================================== */
.deck { background: #fff; border: 1px solid var(--gris-bord); border-radius: 14px; box-shadow: var(--ombre); padding: 8px 8px 0; margin: 18px 0; }
.deck:fullscreen { border-radius: 0; padding: 0; display: flex; flex-direction: column; }
.deck:fullscreen .deck-slides { flex: 1; overflow: auto; padding: 3vh 5vw; }
.deck-slides { padding: 24px 28px; min-height: 60vh; }
.deck-slide { display: none; animation: deckin .25s ease; }
.deck-slide.active { display: block; }
@keyframes deckin { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.deck-step { color: var(--bleu-vif); font-weight: 700; letter-spacing: .04em; text-transform: uppercase; font-size: .9rem; }
.deck-vert .deck-step { color: var(--vert); }
.deck-title { color: var(--bleu); font-size: 2rem; margin: 4px 0 16px; line-height: 1.15; }
.deck-vert .deck-title { color: var(--vert); }
.deck-theory { font-size: 1.25rem; line-height: 1.6; max-width: 70ch; }
.deck-theory ul { margin: 10px 0; }
.deck-theory li { margin: 6px 0; }
.deck-formula { font-size: 1.5rem; background: #2b2b2b; color: #f8f8f2; padding: 14px 20px; border-radius: 10px; margin: 18px 0; display: inline-block; }
.deck-formula code { background: transparent; padding: 0; font-size: inherit; }
.deck-formula strong { color: #7CFC9B; }
.deck-arrow { color: #9aa; margin: 0 10px; }
.deck-slide .ssheet { font-size: 1.15rem; }
.deck-slide .ssheet th, .deck-slide .ssheet td { padding: 8px 14px; min-width: 80px; height: 38px; }
.deck-slide .chart-box { max-width: 680px; }
.deck-bar { position: sticky; bottom: 0; display: flex; align-items: center; gap: 14px; padding: 12px 16px; background: var(--gris-clair); border-top: 1px solid var(--gris-bord); border-radius: 0 0 14px 14px; }
.deck:fullscreen .deck-bar { border-radius: 0; }
.deck-bar .btn[disabled] { opacity: .4; cursor: default; }
.deck-count { font-weight: 700; color: var(--gris); }
.deck-bar #deck-fs { margin-left: auto; }
@media (max-width: 600px) { .deck-title { font-size: 1.5rem; } .deck-theory { font-size: 1.1rem; } .deck-formula { font-size: 1.2rem; } }