/* ==========================================================================
   BASE — structure commune aux 9 styles.
   Chaque thème redéfinit les jetons (--*) puis ajoute ses propres règles,
   toujours préfixées par [data-theme="…"].
   ========================================================================== */

:root {
  /* Couleurs */
  --bg: #ffffff;
  --ink: #111111;
  --ink-soft: #4a4a4a;
  --surface: #f3f3f3;
  --line: #d8d8d8;
  --primary: #1d4ed8;
  --on-primary: #ffffff;
  --accent: #111111;
  --focus: #1d4ed8;

  /* Typo */
  --font-display: system-ui, sans-serif;
  --font-body: system-ui, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Consolas, monospace;
  --body-size: 1.125rem;
  --lh: 1.6;
  --h1-size: clamp(2.6rem, 7.2vw, 5.6rem);
  --h2-size: clamp(2rem, 4.6vw, 3.4rem);

  /* Espace & formes */
  --gutter: clamp(16px, 4vw, 48px);
  --maxw: 1200px;
  --section-pad: clamp(4rem, 10vw, 8rem);
  --radius: 12px;
  --radius-btn: 10px;
  --header-h: 64px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 16px);
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--body-size);
  line-height: var(--lh);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

h1, h2, h3, p, dl, dd, figure, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.08; text-wrap: balance; }
p, dd, li { text-wrap: pretty; }
a { color: inherit; }
svg { display: block; flex-shrink: 0; }
button { font: inherit; color: inherit; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }

.skip {
  position: absolute;
  left: 16px; top: -100px;
  z-index: 1000;
  padding: .75rem 1rem;
  background: #000; color: #fff;
  font: 600 1rem/1 system-ui, sans-serif;
  text-decoration: none;
  border-radius: 6px;
}
.skip:focus { top: 16px; }

.inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- En-tête ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
  max-width: var(--maxw);
  min-height: var(--header-h);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  text-decoration: none;
  font-weight: 700;
}
.brand__mark { font-family: var(--font-display); font-size: 1.25rem; letter-spacing: .02em; }
.brand__name { font-size: .85rem; opacity: .85; }
.nav__list { display: flex; gap: .25rem 1.5rem; }
.nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: .95rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

@media (max-width: 720px) {
  .site-header { position: relative; }
  .site-header__inner { flex-wrap: wrap; padding-block: .5rem; gap: 0; }
  .nav { width: 100%; overflow-x: auto; scrollbar-width: none; margin-inline: calc(var(--gutter) * -1); padding-inline: var(--gutter); width: calc(100% + var(--gutter) * 2); }
  .nav::-webkit-scrollbar { display: none; }
  .nav__list { gap: 1.25rem; }
  .brand__name { display: none; }
}

/* ---------- Boutons ---------- */
.actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.actions--center { justify-content: center; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  min-height: 48px;
  padding: 0 1.4rem;
  border: 2px solid transparent;
  border-radius: var(--radius-btn);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.1;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .2s, color .2s, box-shadow .2s, transform .2s, border-color .2s;
}
.btn--primary { background: var(--primary); color: var(--on-primary); }
.btn--ghost { border-color: currentColor; background: transparent; }

/* ---------- Titres de section ---------- */
.eyebrow {
  margin-bottom: .9rem;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.section > .inner { padding-block: var(--section-pad); }
.section__head { max-width: 46rem; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.section__title { font-size: var(--h2-size); }
.section__intro { margin-top: 1.1rem; font-size: 1.15rem; color: var(--ink-soft); max-width: 40rem; }

/* ---------- Hero ---------- */
.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  align-items: center;
  gap: clamp(2.5rem, 6vw, 5rem);
  padding-block: clamp(3rem, 8vw, 6.5rem);
}
.hero__text { container-type: inline-size; }
/* Taille plafonnée : la ligne la plus longue (--h1-em, mesurée pour chaque police) tient toujours dans sa colonne */
.hero__title { font-size: min(var(--h1-size), calc(100cqi / var(--h1-em, 7))); }
.hero__line { display: block; }
.lead { margin-top: 1.5rem; font-size: clamp(1.1rem, 1.6vw, 1.3rem); max-width: 34rem; color: var(--ink-soft); }

.facts {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}
.fact { display: flex; flex-direction: column-reverse; gap: .25rem; }
.fact__label { font-size: .85rem; color: var(--ink-soft); }
.fact__value { font-family: var(--font-display); font-size: clamp(1.2rem, 2.2vw, 1.6rem); font-weight: 700; line-height: 1.2; }

@media (max-width: 900px) {
  .hero__inner { grid-template-columns: minmax(0, 1fr); }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- Widget des bits ---------- */
.bits { width: 100%; max-width: 30rem; justify-self: center; }
.bits__caption { display: flex; flex-direction: column; gap: .15rem; margin-bottom: 1rem; }
.bits__headline { font-family: var(--font-display); font-size: 1.2rem; }
.bits__hint { font-size: .95rem; color: var(--ink-soft); }
.bits__bytes { display: grid; gap: .6rem; }
.byte {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr)) 3.2rem;
  align-items: center;
  gap: clamp(3px, 1vw, 6px);
}
.bit {
  display: grid;
  place-items: center;
  aspect-ratio: 5 / 6;
  min-width: 0;
  min-height: 32px;
  padding: 0;
  border: 0;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: background-color .18s, color .18s, box-shadow .18s, transform .18s;
}
.byte__char {
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1;
}
.byte__dec { display: block; margin-top: .2rem; font-family: var(--font-mono); font-size: .7rem; font-weight: 500; opacity: .8; }
.bits__footer { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .75rem; margin-top: 1.1rem; }
.bits__word { font-size: .95rem; }
.bits__output { font-family: var(--font-mono); font-weight: 700; font-size: 1.1rem; }
.bits__reset {
  min-height: 40px;
  padding: 0 .9rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  background: transparent;
  font-size: .85rem;
  cursor: pointer;
}

/* ---------- Histoire ---------- */
.timeline { display: grid; gap: 0; max-width: 56rem; }
.event {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr);
  gap: 1.5rem;
  padding-block: 1.4rem;
  border-top: 1px solid var(--line);
}
.event__year { font-family: var(--font-display); font-size: 1.6rem; font-weight: 700; line-height: 1.1; }
.event__tag { font-size: .75rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-soft); margin-bottom: .3rem; }
.event__title { font-size: 1.25rem; }
.event__text { margin-top: .4rem; color: var(--ink-soft); }

@media (max-width: 560px) {
  .event { grid-template-columns: minmax(0, 1fr); gap: .35rem; }
}

/* ---------- Programme ---------- */
.domains {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 19rem), 1fr));
  gap: 1.25rem;
}
.domain { display: flex; flex-direction: column; padding: 1.5rem; }
.domain__title { font-size: 1.35rem; }
.domain__hook { margin-top: .35rem; color: var(--ink-soft); }
.domain__years { display: grid; gap: .9rem; margin-top: 1.25rem; }
.domain__year dt { font-size: .75rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.domain__year dd { margin-top: .15rem; font-size: 1rem; }

.exam {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 1rem 2.5rem;
  margin-top: 2rem;
  padding: 1.5rem 1.75rem;
}
.exam__title { font-size: 1.5rem; }
.exam__list { display: flex; flex-wrap: wrap; gap: .5rem 2rem; }
.exam__item { display: flex; flex-direction: column; }
.exam__k { font-size: .85rem; color: var(--ink-soft); }
.exam__v { font-family: var(--font-display); font-size: 1.4rem; font-weight: 700; line-height: 1.2; }
.exam__note { grid-column: 1 / -1; font-size: .98rem; color: var(--ink-soft); }
@media (max-width: 640px) {
  .exam { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- Projets ---------- */
.project-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 18rem), 1fr));
  gap: 1.25rem;
}
.project { display: flex; flex-direction: column; padding: 1.5rem; }
.project__icon { width: 44px; height: 44px; margin-bottom: 1.1rem; }
.project__title { font-size: 1.3rem; }
.project__text { margin-top: .5rem; color: var(--ink-soft); }
.tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: auto; padding-top: 1.1rem; }
.tag { font-size: .8rem; font-weight: 600; padding: .2rem .6rem; }

/* ---------- Après le bac ---------- */
.futures__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4rem);
}
.futures__title { font-size: 1.5rem; margin-bottom: 1rem; }
.path {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: .1rem 1rem;
  padding-block: .9rem;
  border-top: 1px solid var(--line);
}
.path__name { font-weight: 700; font-size: 1.1rem; }
.path__len { font-size: .9rem; font-weight: 600; white-space: nowrap; align-self: center; }
.path__note { grid-column: 1 / -1; font-size: .98rem; color: var(--ink-soft); }
.jobs { display: flex; flex-wrap: wrap; gap: .5rem; }
.job { padding: .4rem .85rem; font-size: .95rem; font-weight: 600; }
.combos { margin-top: 2rem; font-size: 1rem; }
.combos__label { display: block; font-size: .75rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; margin-bottom: .3rem; color: var(--ink-soft); }
@media (max-width: 820px) {
  .futures__grid { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- Outro & pied de page ---------- */
.outro .inner { text-align: center; }
.outro__title { font-size: var(--h2-size); }
.outro__text { max-width: 36rem; margin: 1rem auto 0; font-size: 1.15rem; color: var(--ink-soft); }

.site-footer__inner { padding-block: 2.5rem; display: grid; gap: .5rem; }
.site-footer__small { font-size: .85rem; color: var(--ink-soft); }

/* ---------- Décors (révélés par thème) ---------- */
.fab {
  position: fixed;
  right: max(16px, env(safe-area-inset-right));
  bottom: calc(96px + env(safe-area-inset-bottom));
  z-index: 60;
  place-items: center;
  width: 56px; height: 56px;
  border-radius: 50%;
  text-decoration: none;
}
.backdrop { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.shape { position: absolute; display: block; }
.ticker { overflow: hidden; white-space: nowrap; }
.ticker__track { display: inline-flex; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}