*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --bg: #1a1a1c;
  --s1: #222224;
  --s2: #2a2a2c;
  --s3: #323234;
  --y: #FFDE59;
  --yr: 255; --yg: 222; --yb: 89;
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.66);
  --bdr: rgba(var(--yr), var(--yg), var(--yb), 0.16);
  --bhi: rgba(var(--yr), var(--yg), var(--yb), 0.48);
  --ok: #4ade80;
  --ko: #f87171;
  --btn-h: 2.75rem;
  --hdr-h: 60px;
  --page-w: 920px;
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
}

html {
  position: fixed;
  width: 100%;
  height: 100%;
  height: 100dvh;
  overflow: hidden;
  background-color: #141416;
}

body {
  position: fixed;
  inset: 0;
  font-family: var(--font-sans);
  font-optical-sizing: auto;
  color: var(--text);
  overflow: hidden;
  overscroll-behavior: none;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

button { font-family: inherit; }
[hidden] { display: none !important; }



/* ════════ 3D Button ════════ */
.btn3d {
  --br: 0.65em;
  --bbg: var(--bg);
  --bol: var(--y);
  font-size: 14px;
  font-weight: 700;
  font-family: var(--font-sans);
  border: none;
  cursor: pointer;
  border-radius: var(--br);
  background: var(--bol);
  text-decoration: none;
  display: inline-block;
  vertical-align: middle;
  overflow: visible;
  padding: 0;
}

.btn3d:disabled { opacity: .4; cursor: not-allowed; }

.btn3d .bt {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  border: 2px solid var(--bol);
  border-radius: var(--br);
  padding: 0 1.4em;
  height: var(--btn-h);
  background: var(--bbg);
  color: var(--y);
  transform: translateY(-.22em);
  transition: transform .1s ease;
  white-space: nowrap;
  letter-spacing: .02em;
  -webkit-user-select: none;
  user-select: none;
}

.btn3d:not(:disabled):hover .bt { transform: translateY(-.36em); }
.btn3d:not(:disabled):active .bt { transform: translateY(0); }

.btn3d.sq { width: var(--btn-h); flex-shrink: 0; }
.btn3d.sq .bt { padding: 0; width: 100%; }

.btn3d.wht { --bol: #fff; }
.btn3d.wht .bt { color: #fff; }

.btn3d.full { width: 100%; }
.btn3d.full .bt { width: 100%; }

.btn3d.ghost { --bol: var(--bdr); }
.btn3d.ghost .bt { border-color: var(--bdr); color: var(--muted); }
.btn3d.ghost:not(:disabled):hover { --bol: var(--y); }
.btn3d.ghost:not(:disabled):hover .bt { border-color: var(--y); color: var(--y); }
.btn3d.ghost.active { --bol: var(--y); }
.btn3d.ghost.active .bt { border-color: var(--y); color: var(--y); }

/* ════════ Logo + version ════════ */
.btn-logo {
  --bol: var(--bdr);
  --br: 0.55em;
  --btn-h: 2rem;
}

.btn-logo .bt {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: .05em;
  padding: 0 .55em 0 .85em;
  border-color: var(--bdr);
  transform: translateY(-.14em);
  transition: transform .1s ease, border-color .15s ease;
  gap: .5rem;
}

.btn-logo:not(:disabled):hover { --bol: var(--y); }
.btn-logo:not(:disabled):hover .bt { border-color: var(--y); color: var(--y); }
.btn-logo:not(:disabled):active .bt { transform: translateY(0); }

.ver {
  font-size: .62rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--y);
  opacity: .75;
}
.btn-logo .ver { align-self: flex-end; line-height: 1; margin-bottom: .32rem; }

@keyframes btnLogoPulse {
  0%   { filter: brightness(1); }
  40%  { filter: brightness(1.3) drop-shadow(0 0 10px rgba(var(--yr), var(--yg), var(--yb), .6)); }
  100% { filter: brightness(1); }
}
.logo-pulse { animation: btnLogoPulse .7s ease-out forwards; }

/* ════════ Header ════════ */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  height: var(--hdr-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.2rem;
  background: var(--bg);
  border-bottom: 2px solid var(--y);
}

.header-l, .header-r { display: flex; align-items: center; gap: .55rem; }
.header-l .btn3d, .header-r .btn3d { --btn-h: 2rem; }
.header-r .btn3d .bt { font-size: .78rem; }

.btn-user { --bol: var(--bdr); --br: .55em; }
.btn-user .bt { color: var(--muted); font-size: .82rem; gap: .45rem; border-color: var(--bdr); }
.btn-user:hover { --bol: var(--y); }
.btn-user:hover .bt { border-color: var(--y); color: var(--text); }
.btn-user.online .bt { color: var(--text); }

#user-name-hdr {
  max-width: 9ch;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ════════ Fil d'Ariane ════════ */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .15rem .45rem;
  padding: .95rem 1.2rem 0;
  font-size: .78rem;
  font-weight: 700;
}
.crumb {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  color: var(--muted);
  text-decoration: none;
  transition: color .15s;
}
.crumb:hover { color: var(--y); }
.crumb.cur { color: var(--y); font-weight: 600; pointer-events: none; }
.crumb-sep { color: var(--bhi); font-size: .55rem; }
.crumbs + .page { padding-top: 1.1rem; }

/* ════════ View ════════ */
#view {
  position: fixed;
  inset: 0;
  z-index: 1;
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding-top: var(--hdr-h);
  padding-bottom: env(safe-area-inset-bottom);
}

.page {
  width: 100%;
  max-width: var(--page-w);
  margin: 0 auto;
  padding: 1.6rem 1.2rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
}
.page.narrow { max-width: 640px; }

@keyframes screenIn {
  from { opacity: 0; transform: scale(.94); }
  to { opacity: 1; transform: scale(1); }
}
.page-enter { animation: screenIn .3s cubic-bezier(.34, 1.56, .64, 1) both; }

.page-head { display: flex; flex-direction: column; gap: .35rem; }
.page-kicker {
  font-size: .66rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--bhi);
}
.page-title {
  font-size: clamp(1.5rem, 5vw, 2.2rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text);
}
.page-sub { font-size: .9rem; color: var(--muted); max-width: 60ch; line-height: 1.5; }

/* ════════ Page de garde ════════ */
.page.home { align-items: center; text-align: center; gap: 1.1rem; padding-top: 3.5rem; }
.home-head { display: flex; flex-direction: column; align-items: center; gap: .55rem; }
.home-kicker {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--y);
}
.home-kicker::before, .home-kicker::after { content: ''; width: 1.4rem; height: 2px; border-radius: 2px; background: var(--bhi); }
.home-title {
  font-size: clamp(2.2rem, 7vw, 3.4rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.01em;
}
.home-sub { font-size: .95rem; color: var(--muted); }
.page.home .sem-btns { margin-top: 1.6rem; }
.sem-btns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  width: min(100%, 560px);
  margin-top: 1rem;
}
.sem-btn .bt {
  flex-direction: column;
  height: auto;
  min-height: 6rem;
  padding: 1.1rem 1.2rem;
  gap: .25rem;
}
.sem-t { font-size: 1.15rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.sem-m { font-size: .74rem; font-weight: 700; color: var(--muted); letter-spacing: .02em; }
.home-resume {
  margin-top: .8rem;
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  position: relative;
  font-size: .82rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  transition: color .15s;
}
.home-resume i { color: var(--y); }
.home-resume strong { color: var(--text); font-weight: 600; }
.home-resume:hover, .home-resume:hover strong { color: var(--y); }

.section-title {
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--bhi);
  display: flex;
  align-items: center;
  gap: .6rem;
  text-decoration: none;
}
.section-title::after { content: ''; flex: 1; height: 1px; background: var(--bdr); }

/* Cartes compactes (semestre, matière, catégorie, chapitre) */
.subjects { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.1rem; }
.ncard.subj .ncard-in {
  flex-direction: row;
  align-items: center;
  gap: 1.1rem;
  padding: 1.15rem 1.3rem;
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(var(--yr), var(--yg), var(--yb), .07), transparent 55%),
    var(--s1);
}
.subj-ico {
  width: 2rem;
  flex-shrink: 0;
  text-align: center;
  color: var(--y);
  font-size: 1.55rem;
  line-height: 1;
}
.subj-img { width: 2.6rem; height: 2.6rem; border-radius: .6rem; object-fit: cover; flex-shrink: 0; }
.subj-txt { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: .25rem; }
.subj-txt .ncard-title { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.ring { position: relative; width: 3.1rem; height: 3.1rem; flex-shrink: 0; }
.ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring circle { fill: none; stroke-width: 3.2; }
.ring-bg { stroke: rgba(255, 255, 255, .08); }
.ring-fg { stroke: var(--y); stroke-linecap: round; transition: stroke-dasharray .6s ease; }
.ring span { position: absolute; inset: 0; display: grid; place-items: center; font-size: .66rem; font-weight: 700; }

/* Statistiques du compte */
.hero-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .55rem; }
.mini-stat { text-align: center; padding: .3rem 0; }
.mini-stat + .mini-stat { border-left: 1px solid var(--bdr); }
.mini-stat-v { font-size: 1.25rem; font-weight: 700; color: var(--y); }
.mini-stat-l { font-size: .6rem; color: var(--muted); text-transform: uppercase; letter-spacing: .07em; margin-top: .1rem; }

/* ════════ Cartes de navigation ════════ */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr));
  gap: 1.1rem;
}

.ncard {
  --nc: var(--y);
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--nc);
  border-radius: 1rem;
  box-shadow: 0 12px 28px rgba(0, 0, 0, .45);
  cursor: pointer;
  position: relative;
  outline: none;
}

.ncard-in {
  background: var(--s1);
  border: 2px solid var(--nc);
  border-radius: 1rem;
  transform: translateY(-.28em);
  transition: transform .12s ease;
  overflow: hidden;
  height: 100%;
  display: flex;
  flex-direction: column;
}
.ncard:hover .ncard-in, .ncard:focus-visible .ncard-in { transform: translateY(-.45em); }
.ncard:active .ncard-in { transform: translateY(0); }

.ncard-body {
  padding: .9rem 1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: .45rem;
  flex: 1;
}
.ncard-top { display: flex; align-items: flex-start; justify-content: space-between; gap: .5rem; }
.ncard-code {
  font-size: .62rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}
.ncard-title { font-size: 1.1rem; font-weight: 600; line-height: 1.25; letter-spacing: -.005em; }
.ncard-desc { font-size: .78rem; color: var(--muted); line-height: 1.45; flex: 1; }
.ncard-meta { display: flex; align-items: center; justify-content: space-between; gap: .5rem; font-size: .76rem; color: var(--muted); font-weight: 500; }

.pbar { height: 5px; background: rgba(255, 255, 255, .07); border-radius: 3px; overflow: hidden; }
.pbar-fill { height: 100%; border-radius: 3px; background: var(--nc, var(--y)); transition: width .5s cubic-bezier(.4, 0, .2, 1); }

.ncard.empty .ncard-meta { font-style: italic; }
.ncard.empty .subj-ico, .ncard.empty .step-ico { color: var(--bhi); }

.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .6rem;
  font-size: .88rem;
  line-height: 1.5;
}
.empty-state i { font-size: 1.6rem; color: var(--bhi); }
.empty-state code { color: var(--y); font-size: .8rem; }

/* ════════ Fiche ════════ */
.fiche-sec { display: flex; flex-direction: column; gap: .75rem; }
.fiche-sec-t {
  font-size: 1rem;
  font-weight: 700;
  color: var(--y);
  display: flex;
  align-items: center;
  gap: .5rem;
}
.fiche-sec-t .n { color: var(--bhi); font-variant-numeric: tabular-nums; }
.fiche-items {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr));
  gap: .75rem;
}
.f-item {
  background: var(--s1);
  border: 1px solid var(--bdr);
  border-radius: .85rem;
  padding: .85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  min-width: 0;
}
.f-name { font-size: .78rem; font-weight: 600; letter-spacing: .02em; color: var(--text); }
.f-tex {
  padding: .5rem 0 .3rem;
  overflow-x: auto;
  overflow-y: hidden;
  text-align: center;
  font-size: 1.02rem;
  scrollbar-width: thin;
}
.f-note { font-size: .76rem; color: var(--muted); line-height: 1.5; }
.f-img { width: 100%; border-radius: .55rem; border: 1px solid var(--bdr); background: #fff; display: block; }

/* ════════ Session (flashcards + quiz) ════════ */
.sess-top { display: flex; justify-content: space-between; align-items: center; gap: .6rem; }
.sess-top-r { display: flex; align-items: center; gap: .55rem; }
.g-cnt { font-size: .8rem; font-weight: 700; color: var(--muted); letter-spacing: .06em; }
.g-timer {
  font-size: .95rem;
  font-weight: 600;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  transition: filter .2s;
}
.g-timer i { color: var(--y); margin-right: .28rem; }
.g-timer.blur-t { filter: blur(5px); cursor: pointer; }
.g-timer.blur-t:hover { filter: blur(0); }

.g-streak {
  display: none;
  align-items: center;
  gap: .15rem;
  font-size: .85rem;
  font-weight: 600;
  color: var(--y);
  white-space: nowrap;
}
.g-streak.flame { color: #fb923c; }

.g-progress-wrap { height: 5px; background: rgba(255, 255, 255, .07); border-radius: 3px; overflow: hidden; }
.g-progress-fill { height: 100%; width: 0; border-radius: 3px; background: var(--y); transition: width .4s cubic-bezier(.4, 0, .2, 1); }

.q-card {
  background: var(--s1);
  border: 1px solid var(--bdr);
  border-radius: 1rem;
  padding: 1.4rem 1.6rem;
  box-shadow: 0 10px 28px rgba(0, 0, 0, .45);
  display: flex;
  flex-direction: column;
  gap: .8rem;
}
.q-lbl { font-size: .65rem; font-weight: 600; letter-spacing: .14em; color: var(--y); text-transform: uppercase; opacity: .6; }
.q-txt { font-size: clamp(1.05rem, 3.6vw, 1.35rem); font-weight: 700; line-height: 1.45; overflow-wrap: anywhere; }
.q-txt .katex-display { margin: .6rem 0; overflow-x: auto; overflow-y: hidden; }
.q-img { max-width: 100%; border-radius: .6rem; border: 1px solid var(--bdr); background: #fff; align-self: center; }

@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.fade-up { animation: fadeUp .3s ease; }

@keyframes cardOk {
  0% { transform: scale(1); box-shadow: 0 10px 28px rgba(0,0,0,.45), 0 0 0 0 rgba(74, 222, 128, .5); }
  9% { transform: scale(1.015); border-color: var(--ok); box-shadow: 0 10px 28px rgba(0,0,0,.45), 0 0 0 6px rgba(74, 222, 128, .22); }
  100% { transform: scale(1); box-shadow: 0 10px 28px rgba(0,0,0,.45), 0 0 0 20px rgba(74, 222, 128, 0); }
}
@keyframes cardKo {
  0%, 100% { transform: translateX(0); }
  10% { transform: translateX(-9px); border-color: var(--ko); box-shadow: 0 0 0 8px rgba(248,113,113,.4); }
  26% { transform: translateX(8px); }
  42% { transform: translateX(-6px); }
  58% { transform: translateX(4px); }
  74% { transform: translateX(-2px); }
}
.q-card.pop-ok { animation: cardOk 1.2s ease-out; }
.q-card.pop-ko { animation: cardKo .48s ease; }

/* Choix QCM */
.choices { display: flex; flex-direction: column; gap: .7rem; }
.choices.vf { flex-direction: row; }
.choices.vf .choice { flex: 1; }

.choice {
  --cc: var(--bdr);
  display: block;
  width: 100%;
  border: none;
  background: var(--cc);
  border-radius: .8rem;
  cursor: pointer;
  text-align: left;
  color: inherit;
  padding: 0;
  font: inherit;
}
.choice-in {
  display: flex;
  align-items: center;
  gap: .75rem;
  background: var(--s2);
  border: 2px solid var(--cc);
  border-radius: .8rem;
  padding: .75rem .9rem;
  min-height: 3.1rem;
  transform: translateY(-.2em);
  transition: transform .1s, border-color .15s, background .15s;
  font-size: .95rem;
  font-weight: 700;
  overflow-wrap: anywhere;
}
.choice-in .katex { font-size: 1.05em; }
.choice-key {
  flex-shrink: 0;
  width: 1.3rem;
  text-align: center;
  font-size: .85rem;
  font-weight: 700;
  color: var(--y);
}
.choice-txt { flex: 1; min-width: 0; overflow-x: auto; overflow-y: hidden; }
.choice:not(:disabled):hover { --cc: var(--bhi); }
.choice:not(:disabled):hover .choice-in { transform: translateY(-.32em); }
.choice:not(:disabled):active .choice-in { transform: translateY(0); }
.choice.sel { --cc: var(--y); }
.choice.sel .choice-in { background: color-mix(in srgb, var(--y) 8%, var(--s2)); }
.choice.good { --cc: var(--ok); }
.choice.good .choice-in { background: color-mix(in srgb, var(--ok) 10%, var(--s2)); }
.choice.bad { --cc: var(--ko); }
.choice.bad .choice-in { background: color-mix(in srgb, var(--ko) 10%, var(--s2)); }
.choice:disabled { cursor: default; }
.choice:disabled:not(.good):not(.bad) { opacity: .5; }

/* Saisie */
.inp3d { background: var(--y); border-radius: .65em; display: block; width: 100%; }
.inp3d input,
.inp3d textarea {
  display: block;
  width: 100%;
  border: 2px solid var(--y);
  border-radius: .65em;
  padding: 0 1em;
  height: var(--btn-h);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  font-family: var(--font-sans);
  font-weight: 600;
  transform: translateY(-.22em);
  transition: transform .1s ease;
  outline: none;
  caret-color: var(--y);
}
.inp3d input:focus, .inp3d textarea:focus { transform: translateY(-.36em); }
.inp3d input::placeholder, .inp3d textarea::placeholder { color: var(--muted); font-weight: 400; }
.inp3d textarea { height: auto; min-height: 5.5rem; padding: .75em 1em; line-height: 1.5; resize: vertical; display: block; }
.inp3d textarea:disabled { color: var(--muted); -webkit-text-fill-color: var(--muted); }
.input-row { display: flex; gap: .55rem; align-items: flex-end; }
.input-row .inp3d { flex: 1; }

/* Pied de carte : verdict et correction, sous un trait, dans la carte question */
.q-card.is-ok { border-color: var(--ok); box-shadow: 0 10px 28px rgba(0, 0, 0, .45), 0 0 0 1px var(--ok); }
.q-card.is-ko { border-color: var(--ko); box-shadow: 0 10px 28px rgba(0, 0, 0, .45), 0 0 0 1px var(--ko); }
.q-verdict {
  border-top: 1px solid var(--bdr);
  margin-top: .2rem;
  padding-top: .95rem;
  display: flex;
  flex-direction: column;
  gap: .4rem;
  animation: fadeUp .25s ease;
}
.qv-line { display: flex; align-items: baseline; gap: .65rem; font-size: 1rem; font-weight: 700; line-height: 1.45; }
.qv-line i { flex-shrink: 0; width: 1rem; text-align: center; }
.qv-line strong { color: #fff; }
.q-verdict.ok .qv-line i { color: var(--ok); }
.q-verdict.ko .qv-line i { color: var(--ko); }
.q-verdict.neutral .qv-line i { color: var(--y); }
.qv-body {
  padding-left: 1.65rem;
  display: flex;
  flex-direction: column;
  gap: .45rem;
  font-size: .93rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, .8);
  overflow-x: auto;
  overflow-y: hidden;
}
.qv-body p { margin: 0; }
.q-verdict .katex-display { margin: .3rem 0; overflow-x: auto; overflow-y: hidden; }

.sess-actions { display: flex; gap: .6rem; }
.sess-actions .btn3d { flex: 1 1 auto; min-width: 0; }
.sess-actions .btn3d.sq { flex: 0 0 auto; }
.sess-actions .btn3d .bt { width: 100%; }

/* Flashcard */
.flip {
  perspective: 1400px;
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
  outline: none;
}
.flip-in {
  position: relative;
  min-height: clamp(220px, 42dvh, 340px);
  transition: transform .5s cubic-bezier(.4, .2, .2, 1);
  transform-style: preserve-3d;
}
.flip.on .flip-in { transform: rotateY(180deg); }
.flip-face {
  position: absolute;
  inset: 0;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  background: var(--s1);
  border: 2px solid var(--bhi);
  border-radius: 1rem;
  box-shadow: 0 10px 28px rgba(0, 0, 0, .45);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .8rem;
  padding: 1.4rem;
  text-align: center;
  overflow: auto;
}
.flip-back { transform: rotateY(180deg); border-color: var(--y); }
.flip-tag { font-size: .62rem; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--bhi); }
.flip-name { font-size: clamp(1.1rem, 4vw, 1.45rem); font-weight: 700; line-height: 1.3; }
.flip-tex { font-size: clamp(.8rem, 3.4vw, 1.15rem); width: 100%; overflow-x: auto; overflow-y: hidden; }
.flip-hint { font-size: .72rem; color: var(--muted); }
.flip-note { font-size: .78rem; color: var(--muted); line-height: 1.5; max-width: 52ch; }
.flip-img { max-width: 100%; max-height: 150px; border-radius: .5rem; background: #fff; }

/* ════════ Résultats ════════ */
.res-card { background: var(--y); border-radius: 1rem; box-shadow: 0 12px 32px rgba(0, 0, 0, .5); }
.res-in {
  background: var(--s1);
  border: 2px solid var(--y);
  border-radius: 1rem;
  transform: translateY(-.28em);
  padding: 2rem 1.6rem 1.6rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}
.res-lbl { font-size: .68rem; font-weight: 600; letter-spacing: .13em; color: var(--muted); text-transform: uppercase; }
.res-score {
  font-size: clamp(3.6rem, 14vw, 6rem);
  font-weight: 700;
  color: var(--y);
  line-height: 1;
  animation: scorePulse 1.4s ease-in-out 3;
}
@keyframes scorePulse {
  0%, 100% { text-shadow: none; }
  50% { text-shadow: 0 0 32px rgba(var(--yr), var(--yg), var(--yb), .55); }
}
.res-best {
  align-self: center;
  font-size: .8rem;
  font-weight: 600;
  color: var(--y);
  display: inline-flex;
  gap: .4rem;
  align-items: center;
}
.stats-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .6rem; }
.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .1rem;
  padding: .4rem .3rem;
  animation: statIn .48s cubic-bezier(.34, 1.56, .64, 1) both;
}
.stat + .stat { border-left: 1px solid var(--bdr); }
.stat:nth-child(2) { animation-delay: 90ms; }
.stat:nth-child(3) { animation-delay: 180ms; }
.stat:nth-child(4) { animation-delay: 270ms; }
@keyframes statIn { from { opacity: 0; transform: translateY(22px) scale(.9); } to { opacity: 1; transform: none; } }
.stat-v { font-size: 1.2rem; font-weight: 600; }
.stat-l { font-size: .6rem; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; text-align: center; }

.dots { display: flex; gap: .3rem; flex-wrap: wrap; justify-content: center; }
.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  transition: transform .15s;
  padding: 0;
}
.dot.ok { background: var(--ok); }
.dot.ko { background: var(--ko); }
.dot.cur { transform: scale(1.45); box-shadow: 0 0 0 2px var(--bg), 0 0 0 3.5px var(--text); }

/* ════════ Modales ════════ */
.backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 450;
  background: rgba(0, 0, 0, .55);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
}
.backdrop.open { display: block; animation: bdIn .18s ease; }
@keyframes bdIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 460;
  width: min(94vw, 500px);
  background: var(--y);
  border-radius: 1rem;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .7);
}
.modal.sm { width: min(92vw, 380px); }
.modal.open { display: block; animation: modalIn .2s ease; }
@keyframes modalIn {
  from { opacity: 0; transform: translate(-50%, calc(-50% - 10px)); }
  to { opacity: 1; transform: translate(-50%, -50%); }
}
.modal-in {
  background: var(--s1);
  border: 2px solid var(--y);
  border-radius: 1rem;
  padding: 1.2rem 1.4rem 1.4rem;
  max-height: calc(100dvh - 5rem);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: none;
  display: flex;
  flex-direction: column;
  gap: .95rem;
}
.modal-in::-webkit-scrollbar { width: 0; }
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .6rem;
  padding-bottom: .85rem;
  margin-bottom: .35rem;
  border-bottom: 1px solid var(--bdr);
}
.modal-head .btn3d { --btn-h: 1.8rem; }
.modal-title { font-size: .7rem; font-weight: 600; letter-spacing: .13em; text-transform: uppercase; color: var(--bhi); }
.modal-msg { font-size: .92rem; font-weight: 600; text-align: center; }

/* Réglages */
.set-row { display: flex; align-items: center; justify-content: space-between; gap: .8rem; }
.set-label { font-size: .78rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.set-label small { text-transform: none; letter-spacing: 0; font-weight: 600; opacity: .8; }
.set-div { height: 1px; background: var(--bdr); }
.set-section-title { font-size: .63rem; font-weight: 600; letter-spacing: .13em; text-transform: uppercase; color: var(--bhi); }
.set-row.disabled { opacity: .38; pointer-events: none; }

.toggle-wrap { display: flex; align-items: center; cursor: pointer; -webkit-user-select: none; user-select: none; flex-shrink: 0; }
.toggle-wrap input { display: none; }
.tog-outer { background: var(--s3); border-radius: 12px; }
.tog-track {
  width: 42px;
  height: 23px;
  border-radius: 12px;
  background: var(--s2);
  border: 1.5px solid var(--bdr);
  position: relative;
  transition: background .2s, border-color .2s, transform .1s;
  transform: translateY(-.15em);
}
.tog-thumb {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--muted);
  position: absolute;
  top: 3px;
  left: 3px;
  transition: left .2s, background .2s;
}
.toggle-wrap input:checked + .tog-outer .tog-track { background: var(--bdr); border-color: var(--y); }
.toggle-wrap input:checked + .tog-outer .tog-thumb { left: 20px; background: var(--y); }
.toggle-wrap:active .tog-track { transform: translateY(0); }

.num-in {
  width: 3.2rem;
  background: var(--s3);
  border: 1.5px solid var(--bdr);
  border-radius: .4rem;
  padding: .25em .4em;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 700;
  outline: none;
  text-align: center;
}
.num-in:focus { border-color: var(--bhi); }
.num-wrap { display: flex; align-items: center; gap: .4rem; }
.num-unit { font-size: .72rem; font-weight: 700; color: var(--muted); }

.slid-block { display: flex; flex-direction: column; gap: 3px; width: 110px; }
.slid-ticks { display: flex; justify-content: space-between; padding: 0 9px; }
.slid-ticks span { width: 1.5px; height: 5px; background: rgba(255, 255, 255, .18); border-radius: 1px; }
input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  background: var(--s3);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--y);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 3px var(--bdr);
}
input[type=range]::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; background: var(--y); border: 2px solid var(--bg); }
.vol-pct { font-size: .72rem; font-weight: 600; color: var(--y); }

.theme-swatches { display: flex; gap: .5rem; flex-wrap: wrap; }
.swatch {
  width: 2rem;
  height: 2rem;
  border-radius: .5rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .12s, border-color .12s;
}
.swatch:hover { transform: scale(1.12); }
.swatch.active { border-color: var(--text); transform: scale(1.12); }

/* Compte */
.panel-head { display: flex; align-items: center; gap: .6rem; min-width: 0; flex: 1; }
.panel-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--s3);
  border: 2px solid var(--bdr);
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 1.1rem;
  flex-shrink: 0;
  overflow: hidden;
}
.panel-avatar img { width: 100%; height: 100%; object-fit: cover; }
.panel-name { font-size: .9rem; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.panel-role { font-size: .7rem; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.panel-note {
  font-size: .8rem;
  color: var(--muted);
  line-height: 1.55;
  display: flex;
  gap: .55rem;
}
.panel-note i { color: var(--y); margin-top: .15rem; }
.auth-err { font-size: .76rem; color: var(--ko); text-align: center; min-height: 1rem; }
.link-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-size: .72rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
  align-self: center;
}
.link-btn:hover { color: var(--ko); }

/* Aide raccourcis */
.kb-group { display: flex; flex-direction: column; gap: .4rem; }
.kb-row { display: flex; align-items: center; justify-content: space-between; gap: .8rem; font-size: .82rem; }
.kb-row span:first-child { color: var(--text); }
.kb-keys { display: flex; gap: .25rem; flex-shrink: 0; }

/* Correction */
.corr-box { display: flex; flex-direction: column; gap: .7rem; }
.corr-q { font-size: .92rem; font-weight: 700; line-height: 1.5; overflow-wrap: anywhere; }
.corr-ans { display: flex; align-items: baseline; gap: .6rem; font-size: .9rem; line-height: 1.5; color: rgba(255, 255, 255, .7); }
.corr-ans i { flex-shrink: 0; width: 1rem; text-align: center; }
.corr-ans.ok i { color: var(--ok); }
.corr-ans.ko i { color: var(--ko); }
.corr-ans span { min-width: 0; overflow-wrap: anywhere; overflow-x: auto; overflow-y: hidden; }
.corr-ans strong { color: #fff; font-weight: 700; }
.corr-explain { border-top: 1px solid var(--bdr); padding-top: .7rem; font-size: .88rem; line-height: 1.6; color: rgba(255, 255, 255, .8); overflow-x: auto; overflow-y: hidden; }
.corr-nav { display: flex; align-items: center; gap: .5rem; }
.corr-nav .btn3d { flex: 1; }
.corr-nav .btn3d .bt { width: 100%; }
.corr-idx { font-size: .75rem; font-weight: 600; color: var(--muted); white-space: nowrap; }

/* ════════ Raccourcis : uniquement dans la fenêtre d'aide ════════ */
.sc {
  display: inline-block;
  font-size: .66rem;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.3;
  padding: .12rem .5rem;
  border-radius: .35rem;
  background: var(--s3);
  border: 1px solid rgba(255, 255, 255, .14);
  border-bottom-width: 2.5px;
  color: var(--text);
  font-family: var(--font-sans);
  white-space: nowrap;
}
.btn3d .bt { position: relative; }
.notif-dot {
  position: absolute;
  top: -.35rem;
  right: -.35rem;
  width: .62rem;
  height: .62rem;
  border-radius: 50%;
  background: #ef4444;
  border: 2px solid var(--bg);
  animation: dotPulse 1.8s ease-in-out infinite;
}
.notif-dot[hidden] { display: none; }
@keyframes dotPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, .6); }
  50% { box-shadow: 0 0 0 5px rgba(239, 68, 68, 0); }
}

/* Pas de clavier physique : pas de bouton d'aide aux raccourcis */
@media (hover: none) and (pointer: coarse) {
  .kb-only { display: none !important; }
}

/* Fenêtre d'aide plus grande sur PC */
@media (min-width: 900px) and (hover: hover) {
  #help-modal { width: min(94vw, 620px); }
  #help-modal .modal-in { padding: 1.6rem 1.9rem 1.9rem; gap: 1.2rem; }
  #help-modal .kb-group { gap: .65rem; }
  #help-modal .kb-row { font-size: .98rem; }
  #help-modal .sc { font-size: .78rem; padding: .18rem .62rem; }
  #help-modal .set-section-title { font-size: .72rem; }
}

/* ════════ Notifs ════════ */
#notif {
  position: fixed;
  top: calc(var(--hdr-h) + 16px);
  left: 50%;
  z-index: 501;
  pointer-events: none;
  opacity: 0;
  transform: translateX(-50%) translateY(-10px) scale(.88);
  transition: opacity .18s, transform .26s cubic-bezier(.34, 1.56, .64, 1);
}
#notif.show { opacity: 1; transform: translateX(-50%) translateY(0) scale(1); }
.nf-floor { background: rgba(74, 222, 128, .22); border-radius: .65em; display: inline-block; }
#notif.ko .nf-floor { background: rgba(248, 113, 113, .22); }
#notif.best .nf-floor { background: rgba(255, 255, 255, .18); }
.nf-face {
  display: flex;
  align-items: center;
  gap: .4rem;
  height: 2.3rem;
  padding: 0 1em;
  background: var(--bg);
  border: 2px solid var(--ok);
  border-radius: .65em;
  transform: translateY(-.22em);
  white-space: nowrap;
  font-weight: 600;
  font-size: .8rem;
  color: #fff;
}
#notif.ko .nf-face { border-color: var(--ko); }
#notif.best .nf-face { border-color: #fff; }

/* ════════ Confetti ════════ */
@keyframes confetti-slow { to { transform: translate3d(25px, 105vh, 0) rotateX(360deg) rotateY(180deg); } }
@keyframes confetti-medium { to { transform: translate3d(100px, 105vh, 0) rotateX(100deg) rotateY(360deg); } }
@keyframes confetti-fast { to { transform: translate3d(-50px, 105vh, 0) rotateX(10deg) rotateY(250deg); } }
#confetti-root { position: fixed; inset: 0; z-index: 500; pointer-events: none; overflow: hidden; }
.confetti { position: absolute; top: -10px; }
.confetti--slow { animation: confetti-slow 2.25s linear forwards; }
.confetti--medium { animation: confetti-medium 1.75s linear forwards; }
.confetti--fast { animation: confetti-fast 1.25s linear forwards; }

/* ════════ Divers ════════ */
.spinner {
  display: inline-block;
  width: 15px;
  height: 15px;
  border: 2px solid var(--bdr);
  border-top-color: var(--y);
  border-radius: 50%;
  animation: spin .6s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

@keyframes streak-shake {
  0%, 100% { transform: translate(0, 0); }
  20% { transform: translate(-2px, 1px) rotate(-.4deg); }
  40% { transform: translate(2.5px, -1px) rotate(.5deg); }
  60% { transform: translate(-1.5px, 2px) rotate(-.3deg); }
  80% { transform: translate(2px, -1px) rotate(.3deg); }
}
.streak-shake { animation: streak-shake .35s cubic-bezier(.36, .07, .19, .97) both; }

@keyframes popIn { from { opacity: 0; transform: scale(.82) translateY(14px); } to { opacity: 1; transform: none; } }
[data-pi] { animation: popIn .28s cubic-bezier(.34, 1.4, .64, 1) both; animation-delay: var(--pi-d, 0ms); }
.pi-done header [data-pi] { animation: none; }

.katex { color: var(--text); }

/* ════════ Parcours d'un chapitre ════════ */
.mastery-line { display: flex; align-items: center; gap: .8rem; margin-top: .5rem; max-width: 460px; }
.mastery-line .pbar { flex: 1; }
.path { list-style: none; display: flex; flex-direction: column; gap: .95rem; max-width: 720px; }
.step-n {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--bhi);
  width: 1.4rem;
  text-align: center;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
.step-ico { color: var(--y); font-size: 1.3rem; width: 1.6rem; text-align: center; flex-shrink: 0; }
.step.final .ncard-title { color: var(--y); }
.step.final .ncard-in {
  background:
    radial-gradient(120% 160% at 0% 0%, rgba(var(--yr), var(--yg), var(--yb), .14), transparent 60%),
    var(--s1);
}
.step.empty { cursor: default; }

/* ════════ Révision ════════ */
.rev { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 2.2rem; align-items: start; }
.toc { position: sticky; top: 1.2rem; }
.toc summary {
  list-style: none;
  cursor: pointer;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--y);
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .3rem 0 .6rem;
}
.toc summary::-webkit-details-marker { display: none; }
.toc summary::after { content: '\f078'; font-family: 'Font Awesome 6 Free'; font-weight: 900; font-size: .6rem; transition: transform .2s; }
.toc[open] summary::after { transform: rotate(180deg); }
.toc-list { list-style: none; display: flex; flex-direction: column; gap: .15rem; border-left: 1px solid var(--bdr); }
.toc-a {
  width: 100%;
  display: flex;
  align-items: baseline;
  gap: .6rem;
  background: none;
  border: none;
  border-left: 2px solid transparent;
  margin-left: -1px;
  padding: .45rem .6rem .45rem .85rem;
  color: var(--muted);
  font-size: .86rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: color .15s, border-color .15s;
}
.toc-a:hover { color: var(--text); border-left-color: var(--bhi); }
.toc-n { font-family: var(--font-serif); color: var(--bhi); font-variant-numeric: tabular-nums; }
.toc-t { flex: 1; min-width: 0; }
.toc-ok { font-size: .7rem; color: var(--ok); opacity: 0; transition: opacity .2s; }
.toc-a.done .toc-ok { opacity: 1; }
.toc-prog { margin-top: .9rem; padding-left: .9rem; font-size: .72rem; color: var(--muted); font-weight: 600; }

.rev-main { display: flex; flex-direction: column; gap: 2.8rem; min-width: 0; }
.rev-sec { display: flex; flex-direction: column; gap: 1rem; scroll-margin-top: 1.2rem; }
.rev-sec .fiche-sec-t { font-size: 1.4rem; color: var(--text); }
.rev-sec .fiche-sec-t .n { color: var(--y); }
.rev-cours { display: flex; flex-direction: column; gap: .8rem; font-size: 1rem; line-height: 1.7; color: rgba(255, 255, 255, .86); max-width: 68ch; }
.rev-cours .katex { font-size: 1.05em; }
.rev-cours .katex-display, .callout .katex-display { overflow-x: auto; overflow-y: hidden; padding: .15rem 0; }

.callout {
  border-left: 3px solid var(--y);
  background: rgba(var(--yr), var(--yg), var(--yb), .05);
  border-radius: 0 .6rem .6rem 0;
  padding: .8rem 1rem;
  font-size: .92rem;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  gap: .35rem;
  overflow-x: auto;
}
.callout-h { font-size: .68rem; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: var(--y); display: flex; align-items: center; gap: .45rem; }
.callout.trap { border-left-color: #fb923c; background: rgba(251, 146, 60, .06); }
.callout.trap .callout-h { color: #fb923c; }

.read-btn { align-self: flex-start; --btn-h: 2.3rem; }
.read-btn .bt { font-size: .82rem; }
.rev-next { margin-top: .5rem; }

/* ════════ Liens eCampus ════════ */
.page-title-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.ext-link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-size: .74rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  transition: color .15s;
  white-space: nowrap;
}
.ext-link i { font-size: .65rem; }
.ext-link:hover { color: var(--y); }
.card-wrap { position: relative; }
.ext-link.on-card { position: absolute; top: .65rem; right: 1rem; z-index: 3; padding: .2rem .1rem; transform: translateY(-.28em); }
.ncard.has-link .ring { margin-top: .9rem; }

/* ════════ Mascotte (PC uniquement) ════════ */
.q-mascot {
  position: fixed;
  bottom: 1rem;
  left: 1rem;
  width: 170px;
  height: 170px;
  z-index: 150;
  pointer-events: none;
}
.q-mascot lottie-player {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transform: translateY(10px) scale(.85);
  transition: opacity .3s ease, transform .4s cubic-bezier(.34, 1.56, .64, 1);
}
.q-mascot lottie-player.visible { opacity: 1; transform: none; }

/* ════════ Graphique du compte ════════ */
.chart { display: flex; flex-direction: column; gap: .6rem; }
.chart-head { display: flex; align-items: center; justify-content: space-between; gap: .6rem; flex-wrap: wrap; }
.chips { display: flex; gap: .3rem; flex-wrap: wrap; }
.chip {
  background: none;
  border: 1px solid var(--bdr);
  border-radius: 2rem;
  padding: .2rem .65rem;
  font-size: .7rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
}
.chip:hover { color: var(--text); }
.chip.on { color: var(--bg); background: var(--y); border-color: var(--y); }
.chart-svg svg { width: 100%; height: auto; display: block; overflow: visible; }
.chart-grid { stroke: rgba(255, 255, 255, .07); stroke-width: 1; }
.chart-lbl { fill: var(--muted); font-size: 9px; text-anchor: end; font-family: var(--font-sans); }
.chart-line { fill: none; stroke: var(--y); stroke-width: 2.2; stroke-linejoin: round; stroke-linecap: round; }
.chart-area { fill: url(#chart-grad); }
.chart-stop-a { stop-color: var(--y); stop-opacity: .3; }
.chart-stop-b { stop-color: var(--y); stop-opacity: 0; }
.chart-pt { fill: var(--s1); stroke: var(--y); stroke-width: 1.6; cursor: default; }
.chart-pt.last { fill: var(--y); }
.chart-empty { display: flex; flex-direction: column; align-items: center; gap: .5rem; padding: 1.4rem 0; color: var(--muted); font-size: .82rem; text-align: center; }
.chart-empty i { font-size: 1.4rem; color: var(--bhi); }
.chart-foot { display: flex; justify-content: space-between; gap: .6rem; flex-wrap: wrap; font-size: .74rem; color: var(--muted); }
.chart-foot strong { color: var(--text); font-weight: 600; }
.chart-foot .up { color: var(--ok); margin-left: .3rem; }
.chart-foot .down { color: var(--ko); margin-left: .3rem; }
.chart-foot i { font-size: .65rem; margin-right: .15rem; }

/* ════════ Installation mobile ════════ */
.install-top { display: flex; align-items: center; gap: .9rem; }
.install-top img { border-radius: 14px; flex-shrink: 0; }
.install-t { font-family: var(--font-serif); font-size: 1.1rem; font-weight: 600; }
.install-s, .install-p { font-size: .84rem; color: var(--muted); line-height: 1.5; }
.install-steps { padding-left: 1.2rem; display: flex; flex-direction: column; gap: .45rem; font-size: .88rem; line-height: 1.5; }
.install-steps i { color: var(--y); }

/* ════════ Page introuvable ════════ */
.page.nf-page { min-height: calc(100dvh - var(--hdr-h)); align-items: center; justify-content: center; gap: 1.1rem; text-align: center; padding-bottom: 4rem; }
.nf-anim { width: min(62vw, 260px); aspect-ratio: 1; margin-bottom: -1.2rem; }
.nf-anim lottie-player { width: 100%; height: 100%; }
.nf-txt { display: flex; flex-direction: column; align-items: center; gap: .55rem; max-width: 46ch; }
.nf-code { font-size: .72rem; font-weight: 600; letter-spacing: .2em; text-transform: uppercase; color: var(--y); }
.nf-title { font-family: var(--font-serif); font-size: clamp(1.7rem, 5vw, 2.4rem); font-weight: 600; line-height: 1.15; }
.nf-sub { font-size: .95rem; line-height: 1.6; color: var(--muted); }
.nf-actions { display: flex; gap: .75rem; flex-wrap: wrap; justify-content: center; margin-top: .6rem; }

/* ════════ Code ════════ */
.code {
  background: #0f0f11;
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: .55rem;
  padding: .75rem .9rem;
  overflow-x: auto;
  font-family: 'JetBrains Mono', ui-monospace, 'Cascadia Code', Consolas, monospace;
  font-size: .82rem;
  line-height: 1.55;
  color: #e6e6e6;
  text-align: left;
  white-space: pre;
  tab-size: 4;
}
.code.out { color: #b9f6ca; background: #0c120e; }
.ic {
  font-family: 'JetBrains Mono', ui-monospace, Consolas, monospace;
  font-size: .88em;
  background: rgba(255, 255, 255, .08);
  border-radius: .3rem;
  padding: .05em .35em;
}
.rev-ex { display: flex; flex-direction: column; gap: .5rem; }
.rev-ex figcaption { font-size: .8rem; font-weight: 600; color: var(--muted); }
.rev-out { display: flex; flex-direction: column; gap: .3rem; }
.rev-out > span { font-size: .66rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.f-def { font-size: .9rem; line-height: 1.55; color: rgba(255, 255, 255, .88); }
.flip-def { font-size: 1rem; line-height: 1.55; max-width: 52ch; }
.flip-code { max-width: 100%; font-size: .78rem; }
.q-card .code { margin-top: .2rem; }

/* ════════ Récap de fin de leçon ════════ */
.recap {
  background: rgba(var(--yr), var(--yg), var(--yb), .06);
  border-radius: .9rem;
  padding: 1.1rem 1.3rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: .7rem;
}
.recap-h { font-family: var(--font-serif); font-size: 1.25rem; font-weight: 600; color: var(--y); display: flex; align-items: center; gap: .55rem; }
.recap-h i { font-size: .95rem; }
.recap ul { padding-left: 1.2rem; display: flex; flex-direction: column; gap: .5rem; font-size: .95rem; line-height: 1.6; }
.recap li::marker { color: var(--y); }

/* ════════ Responsive ════════ */
@media (min-width: 861px) {
  .toc summary { pointer-events: none; }
  .toc summary::after { display: none; }
}

@media (min-width: 900px) {
  :root { --btn-h: 3rem; }
  .page { padding: 2rem 1.6rem 3.5rem; gap: 1.5rem; }
}

@media (max-width: 860px) {
  .rev { grid-template-columns: 1fr; gap: 1.2rem; }
  .q-mascot { display: none; }
  .toc { position: static; border-bottom: 1px solid var(--bdr); padding-bottom: .4rem; }
  .rev-sec .fiche-sec-t { font-size: 1.2rem; }
  .subjects { grid-template-columns: minmax(0, 1fr); }
  .subj-txt .ncard-title { white-space: normal; }
}

@media (max-width: 760px) {
  .stats-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat:nth-child(odd) { border-left: none; }
}

@media (max-width: 620px) {
  .lbl-md { display: none; }
}

@media (max-width: 480px) {
  :root { --hdr-h: 56px; }
  header { padding: 0 .5rem 0 .7rem; }
  .header-r { gap: .35rem; }
  #user-name-hdr { display: none; }
  .btn-user { width: var(--btn-h); }
  .btn-user .bt { padding: 0; width: 100%; }
  .btn-logo .bt { font-size: .9rem; padding: 0 .45em 0 .65em; gap: .4rem; }
  .crumbs { padding: .8rem .9rem 0; font-size: .74rem; }
  .page.home { padding-top: 2.2rem; }
  .sem-btns { grid-template-columns: 1fr; }
  .ncard.subj .ncard-in { padding: .85rem .9rem; gap: .8rem; }
  .page { padding: 1.1rem .9rem 2.5rem; gap: 1.1rem; }
  .q-card { padding: 1.1rem 1rem; }
  .res-in { padding: 1.5rem 1rem 1.2rem; }
  .modal-in { padding: 1rem 1rem 1.2rem; }
  .choices.vf { flex-direction: column; }
  .code { font-size: .74rem; padding: .65rem .75rem; }
  .sess-actions .btn3d .bt { padding: 0 .9em; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* Titres et énoncés en serif (esprit claude.ai), interface en sans-serif */
.home-title, .page-title, .fiche-sec-t, .flip-name, .q-txt, .corr-q, .modal-msg {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -.005em;
}
.home-title { font-weight: 600; letter-spacing: -.02em; }

/* Listes dans le cours et les encadrés */
.rev-cours ul, .callout ul { padding-left: 1.2rem; display: flex; flex-direction: column; gap: .35rem; }
.rev-cours li::marker, .callout li::marker { color: var(--y); }
.rev-cours strong, .callout strong, .recap strong, .qv-body strong, .corr-explain strong, .f-def strong { color: #fff; font-weight: 650; }

/* Exemples corrigés dans le cours */
.rev-ex { border-left: 3px solid var(--bhi); padding: .2rem 0 .2rem .9rem; }
.rev-ex figcaption { font-size: .86rem; color: var(--text); }
.rev-ex .f-note { font-size: .93rem; line-height: 1.65; color: rgba(255, 255, 255, .86); }