/* ============================================================
   Base — reset, typographie, layout global, accessibilité.
   ============================================================ */

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

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 50% -180px, var(--accent-soft), transparent 60%),
    var(--bg);
  transition: background-color var(--track);
}

img,
svg {
  display: inline-block;
  vertical-align: middle;
}

h1,
h2,
h3 {
  line-height: 1.15;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
  font-weight: 700;
}

h1 { font-size: clamp(2.1rem, 4vw, 3.1rem); }
h2 { font-size: clamp(1.4rem, 2.4vw, 1.7rem); }
h3 { font-size: 1.1rem; }

:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Liens d'évitement (accessibilité) */
.skip {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--accent);
  color: var(--on-accent);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 100;
  transition: top var(--track);
}
.skip:focus { top: 1rem; }

/* Barre supérieure */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: saturate(1.4) blur(10px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}
.topbar__in {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.7rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 11px;
  color: var(--on-accent);
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  box-shadow: var(--shadow-sm);
}
.brand small {
  display: block;
  font-weight: 400;
  font-size: 0.72rem;
  color: var(--text-faint);
  letter-spacing: 0.02em;
}

/* Contenu */
.layout {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.2rem 1.25rem 5rem;
}

/* Flocons décoratifs */
.snowfall {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  color: var(--accent);
}
.snowfall svg {
  position: absolute;
  opacity: 0.16;
  animation: snowDrift 16s ease-in-out infinite alternate;
}
.snowfall svg:nth-child(2) { animation-duration: 22s; }
.snowfall svg:nth-child(3) { animation-duration: 27s; }
@keyframes snowDrift {
  from { transform: translateY(0) rotate(0deg); }
  to { transform: translateY(24px) rotate(12deg); }
}
.snowfall + .skip { position: fixed; }
.layout,
.footer { position: relative; z-index: 1; }

.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1rem 1.25rem 2rem;
  color: var(--text-faint);
  font-size: 0.82rem;
  text-align: center;
}