/* ============================================================
   IMASCIENCE — Base : fontes, reset, typographie, layout
   ============================================================ */

@font-face {
  font-family: "Raleway";
  src: url("../fonts/raleway-variable-normal.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Raleway";
  src: url("../fonts/raleway-variable-italic.woff2") format("woff2");
  font-weight: 100 900;
  font-style: italic;
  font-display: swap;
}

/* ---------- Reset minimal ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
img, picture, video, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  line-height: var(--leading-body);
  color: var(--color-ink);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

/* ---------- Typographie ---------- */
h1, h2, h3, h4 {
  color: var(--color-heading);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  text-wrap: balance;
}
h1 { font-size: clamp(var(--text-4xl), 4.5vw, var(--text-7xl)); }
h2 { font-size: clamp(var(--text-3xl), 3.5vw, var(--text-5xl)); }
h3 { font-size: clamp(var(--text-xl), 2.5vw, var(--text-3xl)); }
h4 { font-size: var(--text-xl); }

p + p { margin-top: var(--space-4); }

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.lead {
  font-size: var(--text-xl);
  line-height: var(--leading-snug);
  color: var(--color-ink-soft);
}

/* ---------- Layout ---------- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  /* rythme vertical de la maquette : ~64px mobile → ~88px desktop
     (nettement plus serré que l'ancien 12→24 = 48→96px + 8vw) */
  padding-block: clamp(var(--space-12), 6vw, var(--space-16));
}

/* ---------- Boutons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-pill);
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: background var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
}
.btn:hover { transform: translateY(-1px); }

.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
}
.btn--ghost {
  border: 1px solid currentColor;
  color: var(--color-ink);
}

/* ---------- Accessibilité ---------- */
:focus-visible {
  outline: 2px solid var(--color-blue);
  outline-offset: 2px;
}
.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
  background: var(--color-white);
  padding: var(--space-2) var(--space-4);
  z-index: 100;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}