*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.12; margin: 0 0 var(--space-3); }
p { margin: 0 0 var(--space-3); max-width: 68ch; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-underline-offset: 0.2em; }
strong { font-weight: 600; }
.pl-num { font-variant-numeric: tabular-nums; }
.pl-eyebrow { font-family: var(--font-body); font-size: var(--fs-eyebrow); letter-spacing: 0.22em; text-transform: uppercase; color: var(--ink-soft); margin: 0 0 var(--space-3); }

/* Bottoni primitivi — condivisi da <a> e <button> su tutte le pagine */
.pl-btn { display: inline-block; font: inherit; font-size: 0.9375rem; letter-spacing: 0.04em; padding: var(--space-3) var(--space-4); border: 0; border-radius: var(--radius-sm); background: transparent; text-decoration: none; cursor: pointer; transition: transform 150ms var(--ease-out), background-color 200ms var(--ease-out), color 200ms var(--ease-out); }
.pl-btn:active { transform: scale(0.97); }
.pl-btn--solid { background: var(--accent); color: var(--accent-ink); }
.pl-btn--solid:hover { background: var(--ink); color: var(--bg); }
.pl-btn--ghost { background: transparent; border: 1px solid currentColor; color: var(--ink); }
.pl-btn--ghost:hover { background: var(--ink); color: var(--bg); }

.pl-container { max-width: var(--container); margin-inline: auto; padding-inline: var(--space-4); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.pl-skip-link {
  position: absolute; left: var(--space-3); top: -60px; z-index: 200;
  background: var(--ink); color: var(--bg); padding: var(--space-2) var(--space-3);
  border-radius: var(--radius); transition: top 150ms var(--ease-out);
}
.pl-skip-link:focus { top: var(--space-3); }

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

/* Bersaglio dello skip-link: riceve il focus per spostare la tastiera nel
   contenuto, ma non deve mostrare un anello di focus (non è un controllo). */
#pl-main:focus,
#pl-main:focus-visible { outline: none; }

/* Capitolo full-bleed */
.pl-chapter { position: relative; background: var(--bg); color: var(--ink); }
.pl-chapter--dark { background: var(--bg); color: var(--ink); }

/* Texture marmo: impercettibile ovunque (una spolverata, non un pattern).
   Nota: sui capitoli scuri .pl-chapter--dark e .pl-marble stanno sullo stesso
   elemento, quindi una texture più marcata dedicata al fondo scuro farebbe
   cadere il contrasto AA di eyebrow/lead — si tiene faint anche lì. */
.pl-marble { position: relative; isolation: isolate; }
.pl-marble::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background-image: url('../img/marble-texture.svg');
  background-size: cover; background-position: center;
  opacity: 0.06;
}

/* Filetto oro (solo capitoli scuri) / filetto chiaro */
.pl-rule { height: 1px; background: var(--border); border: 0; margin: 0; }
.pl-chapter--dark .pl-rule { background: var(--gold); opacity: 0.5; }