/* ==========================================================================
   base.css — reset, tipografia, primitive di layout.
   Ogni valore deriva da tokens.css. Nessun literal di colore o dimensione
   introdotto qui, salvo i breakpoint nelle @media (le custom properties non
   sono valutabili dentro una media query: --bp-mobile resta la fonte di
   verità dichiarata, 768px è la sua trascrizione obbligata).
   ========================================================================== */

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

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

@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;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  /* Il fondo del sito è --color-off-white. Il #e9e6e1 dell'export è il
     colore del canvas di Claude Design, non un token del sistema. */
  background: var(--color-off-white);
  color: var(--color-ink);
  font-family: var(--font-text);
  font-size: var(--text-body);
  line-height: var(--lh-body);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  margin: 0;
  text-wrap: pretty;
}

h1 { font-size: var(--text-display); line-height: var(--lh-display); letter-spacing: var(--ls-display); }
h2 { font-size: var(--text-h2); line-height: var(--lh-h2); letter-spacing: -0.01em; }
h3 { font-size: var(--text-h3); line-height: var(--lh-h3); }

p, ul, ol { margin: 0 0 var(--space-5); }
p:last-child, ul:last-child, ol:last-child { margin-bottom: 0; }

strong { font-weight: 500; }

a { color: var(--color-link); text-decoration: none; }
a:hover { color: var(--color-link-hover); text-decoration: underline; text-underline-offset: 3px; }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

img, svg { max-width: 100%; height: auto; display: block; }

hr {
  border: 0;
  height: var(--border-hair);
  background: var(--color-rule);
  margin: var(--space-7) 0;
}

/* --- Primitive di layout ------------------------------------------------ */

.container {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--space-7);
}

.section { padding-block: var(--space-9); }
.section--tight { padding-block: var(--space-8); }

/* Colonna di lettura: 65ch dal token --measure (brief 5.2: 65–70ch). */
.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-5); }
.prose h2 { margin-top: var(--space-8); }
.prose h3 {
  margin-top: var(--space-7);
  font-size: var(--text-h3);
}
.prose ul { padding-left: var(--space-5); }
.prose li + li { margin-top: var(--space-3); }
.prose li::marker { color: var(--color-ink-muted); }

.lead {
  font-size: var(--text-lead);
  line-height: var(--lh-lead);
  font-weight: 300;
  max-width: var(--measure);
  text-wrap: pretty;
}

.eyebrow {
  font-size: var(--text-label);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-4);
}

.rule {
  height: var(--border-hair);
  background: var(--color-rule);
  border: 0;
  margin: 0;
}

/* --- Superfici ---------------------------------------------------------- */

.on-navy {
  background: var(--color-navy);
  color: var(--color-on-navy);
}
.on-navy h1, .on-navy h2, .on-navy h3 { color: var(--color-on-navy); }
.on-navy p { color: var(--color-on-navy-muted); }
.on-navy .eyebrow { color: var(--color-accent); }
.on-navy a { color: var(--color-on-navy); }

/* Grana: SVG feTurbulence inline, nessun asset raster (nota d'uso export). */
.grain { position: relative; overflow: hidden; }
.grain > * { position: relative; }
.grain::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* --- Utility ------------------------------------------------------------ */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: var(--space-4);
  z-index: 100;
  transform: translateY(-200%);
  background: var(--color-cta);
  color: var(--color-navy);
  font-weight: 700;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
}
.skip-link:focus { transform: translateY(0); }

/* --- Mobile ------------------------------------------------------------- */
/* Scala ~75% sul display, minimi rispettati: body 16px, mai sotto. */

@media (max-width: 768px) {
  body { font-size: 16px; }
  h1 { font-size: var(--text-display-m); line-height: var(--lh-display-m); letter-spacing: -0.012em; }
  h2 { font-size: 30px; }
  h3 { font-size: 22px; }
  .lead { font-size: var(--text-lead-m); line-height: var(--lh-body); }
  .container { padding-inline: var(--space-5); }
  .section { padding-block: var(--space-8); }
  .section--tight { padding-block: var(--space-7); }
}

/* Ritmo verticale fra blocchi. Niente style inline nei template. */
.stack-sm { margin-top: var(--space-5); }
.stack-md { margin-top: var(--space-6); }
.stack-lg { margin-top: var(--space-8); }