/* ============================================================
   Base typography + utilities (DARK).
   ============================================================ */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-tight);
  line-height: var(--lh-tight);
  color: var(--fg-primary);
  font-variation-settings: "opsz" 144, "SOFT" 30;
}

h1 { font-size: var(--fs-6xl); letter-spacing: var(--tracking-tighter); }
h2 { font-size: var(--fs-4xl); letter-spacing: var(--tracking-tight); }
h3 { font-size: var(--fs-2xl); letter-spacing: var(--tracking-snug); }
h4 { font-size: var(--fs-xl); letter-spacing: 0; line-height: var(--lh-snug); }

p {
  max-width: var(--container-text);
  color: var(--fg-secondary);
  line-height: var(--lh-relaxed);
}
p.lead { font-size: var(--fs-lg); color: var(--fg-secondary); max-width: 56ch; }

strong, b { font-weight: var(--fw-semibold); color: var(--fg-primary); }

a { transition: color var(--dur-fast) var(--ease-out); }

/* Eyebrow */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--c-sky-300);
}
.eyebrow::before {
  content: "";
  width: 28px; height: 1px;
  background: currentColor;
  display: inline-block;
  opacity: 0.7;
}
.eyebrow--ink { color: var(--c-slate-400); }
.eyebrow--bright { color: var(--accent); }

/* Inline link */
.link {
  color: var(--c-slate-50);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 50%, transparent);
  padding-bottom: 1px;
  transition: border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}
.link:hover { border-color: var(--accent); color: var(--accent); }

/* Utilities */
.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;
}
.text-muted     { color: var(--fg-muted); }
.text-secondary { color: var(--fg-secondary); }
.text-balance   { text-wrap: balance; }
.text-on-dark   { color: var(--fg-primary); }

.font-mono    { font-family: var(--font-mono); }
.font-display { font-family: var(--font-display); }

.flow > * + * { margin-top: var(--sp-4); }
.flow-lg > * + * { margin-top: var(--sp-5); }
.flow-xl > * + * { margin-top: var(--sp-6); }

/* Italic display fragment + accent gradient text */
.display-italic {
  font-style: italic;
  font-variation-settings: "opsz" 144, "SOFT" 100;
  color: var(--c-indigo-300);
}
.text-accent { color: var(--accent); }

.text-gradient {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  font-style: italic;
  font-variation-settings: "opsz" 144, "SOFT" 100;
}

/* Grain overlay (sottile, niente repaint scrollante) */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: var(--z-sticky);
  opacity: 0.06;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 0.7 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

/* Reveal-on-scroll (IntersectionObserver + .in-view) */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
  transition-delay: calc(var(--reveal-i, 0) * 90ms);
  will-change: opacity, transform;
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

body { background: var(--bg-page); color: var(--fg-primary); }

/* Reset di reset.css per body — evita sovrapposizione con tokens dark */
html { background: var(--c-slate-950); }