/* Reset e base tipografica */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--papier);
  color: var(--encre);
  font-family: var(--sans);
  font-size: var(--fs-m);
  font-weight: 400;
  line-height: 1.55;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}
/* grana di carta: appena percepibile, non intercetta il tocco */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .09  0 0 0 0 .14  0 0 0 0 .17  0 0 0 .06 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}
body > * { position: relative; z-index: 1; }

img, svg, video { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
h1, h2, h3, h4 { margin: 0; font-weight: 400; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }

/* titoli e numeri: serif a dimensione ottica alta, mai bold */
.serif, h1, h2, h3 {
  font-family: var(--serif);
  font-optical-sizing: auto;
  font-variation-settings: "opsz" 60;
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.08;
  text-wrap: balance;
}
.num { font-variant-numeric: lining-nums tabular-nums; }

::selection { background: var(--encre); color: var(--papier); }
/* superfici del browser: tutto dalla palette, niente default di sistema */
html { caret-color: var(--encre); accent-color: var(--encre); scrollbar-color: var(--ardoise) transparent; scrollbar-width: thin; }
.is-dark { caret-color: var(--papier); accent-color: var(--papier); scrollbar-color: var(--ardoise) transparent; }
input:-webkit-autofill, input:-webkit-autofill:focus { -webkit-text-fill-color: var(--encre); box-shadow: 0 0 0 1000px white inset; }
/* transizione tra pagine dello stesso sito (A/B → /merci/) dove il browser la supporta */
@view-transition { navigation: auto; }
::view-transition-old(root), ::view-transition-new(root) { animation-duration: 0.35s; animation-timing-function: var(--ease-out); }

:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--encre);
  outline-offset: 3px;
  border-radius: 4px;
}
.on-dark :focus-visible, .is-dark :focus-visible { outline-color: var(--papier); }

.sr-only {
  position: absolute !important; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 12px; top: -64px; z-index: 100;
  background: var(--encre); color: var(--papier); padding: 12px 18px; border-radius: var(--r-s);
  transition: top var(--t-fast) var(--ease-out);
}
.skip-link:focus { top: 12px; }

/* rivelazione allo scroll: nascosto SOLO se il JS è attivo (classe .js messa da boot.js) */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.9s var(--ease-out) var(--d, 0ms), transform 0.9s var(--ease-out) var(--d, 0ms);
}
.js [data-reveal].is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
}