/* ============================================
   KeyZen — Base, reset, typographie globale
   ============================================ */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background var(--t-med) var(--ease), color var(--t-med) var(--ease);
}
/* CR 09/2026 (Sprint 3 \u00b7 F12) \u2014 Interligne mobile r\u00e9duit.
   Sur mobile, line-height 1.6 empile trop les paragraphes.
   1.5 reste tr\u00e8s lisible (norme WCAG \u2265 1.5) et gagne ~5% de contenu
   visible par \u00e9cran, sans sacrifier le confort de lecture. */
@media (max-width: 600px) {
  body { line-height: 1.5; }
}

img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: 0; padding: 0; }
a { color: inherit; text-decoration: none; }

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: var(--heading-weight, 400);
  font-style: var(--heading-style, normal);
  letter-spacing: var(--letter-spacing-display, -0.02em);
  line-height: 1.08;
  color: var(--text);
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; text-wrap: pretty; }

/* Eyebrow — petite étiquette éditoriale au-dessus des titres */
.eyebrow {
  font-family: var(--font-sans);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 28px;
  height: 1px;
  background: var(--accent);
}

/* Conteneur */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

/* Section */
section {
  padding-top: var(--section-y);
  padding-bottom: var(--section-y);
}

/* Utilitaires */
.muted { color: var(--text-soft); }
.serif { font-family: var(--font-serif); }
.italic { font-style: italic; }
.text-center { text-align: center; }

/* Boutons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.95rem 1.75rem;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  border-radius: 999px;
  transition: all var(--t-med) var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
  position: relative;
}
.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
}
.btn-primary:hover {
  background: var(--ink);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  border-color: var(--line-strong);
  color: var(--text);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, transparent);
}
.btn-ghost {
  color: var(--text);
  padding-left: 0;
  padding-right: 0;
}
.btn-ghost::after {
  content: "→";
  transition: transform var(--t-med) var(--ease);
}
.btn-ghost:hover::after { transform: translateX(4px); }

/* Liens inline */
.link-underline {
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--t-fast) var(--ease);
}
.link-underline:hover { text-decoration-color: var(--accent); }

/* ============== GRILLE DE BASE ============== */
/* CR 09/2026 (Sprint 2 · F14) — Grille adaptative continue.
   Avant : bascule brutale 3 cols \u2192 1 col \u00e0 900px, laissant les
   phablets (601\u2013899px) en 2 cols avec cartes très serrées.
   Après : palier interm\u00e9diaire 2 cols pour grid-3/4 entre 700 et 900px,
   et bascule 1 col d\u00e9s 700px pour grid-2 (\u00e9vitant les paires \u00e9tir\u00e9es).
   Note : .grid-2 utilis\u00e9 avec alignItems:center reste "texte + image
   c\u00f4te-\u00e0-c\u00f4te" \u2014 pattern semantique, on ne le casse pas. */
.grid { display: grid; gap: var(--space-6); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Palier interm\u00e9diaire tablette : 2 cols pour les grid-3 et grid-4
   (\u00e9vite les cartes \u00e9cras\u00e9es \u00e0 300px de large). */
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
}
/* Palier mobile : 1 col pour tous. */
@media (max-width: 700px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* Variante auto : pour les grilles de cartes homog\u00e8nes.
   Utilisation : <div class="grid grid-auto"> ou combiner avec grid-min-*.
   Le minmax(280px, 1fr) \u00e9vite les cartes trop \u00e9troites tout en
   remplissant l'espace disponible. */
.grid-auto {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.grid-min-260 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-min-320 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid-min-360 { grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); }

/* Animations au scroll */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 900ms var(--ease-out), transform 900ms var(--ease-out);
  will-change: opacity, transform;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 100ms; }
.reveal-delay-2 { transition-delay: 200ms; }
.reveal-delay-3 { transition-delay: 300ms; }
.reveal-delay-4 { transition-delay: 400ms; }

/* Divider */
.divider {
  height: 1px;
  background: var(--line);
  border: 0;
  margin: 0;
}

/* Form base */
input, textarea, select {
  font: inherit;
  color: inherit;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  padding: 0.75rem 0;
  width: 100%;
  outline: none;
  transition: border-color var(--t-fast) var(--ease);
}
input:focus, textarea:focus, select:focus {
  border-bottom-color: var(--accent);
}
label { display: block; font-size: var(--fs-small); color: var(--text-soft); margin-bottom: 0.25rem; letter-spacing: 0.02em; }

::selection { background: var(--accent); color: var(--accent-contrast); }

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}