/* ==========================================================================
   MP Design System v3 · Base
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  scroll-padding-top: calc(var(--nav-h) + var(--space-4));
  interpolate-size: allow-keywords;
  overflow-x: clip;
  background: var(--bg);
}

/* Font arrivati oltre la soglia (motion.js): restano quelli di sistema per tutta la visita, zero salti */
.fonts-late {
  --font-display: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, monospace;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-normal);
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

/* Fondo firma: aurora + griglia tecnica + grana */
.ds-backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: var(--grad-aurora), var(--bg);
}
.ds-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 80%);
  opacity: 0.5;
}
.ds-backdrop::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.05;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img, svg, video, canvas { display: block; max-width: 100%; }
img, video { height: auto; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
:focus-visible { outline: none; box-shadow: var(--focus-ring); border-radius: var(--radius-xs); }
::selection { background: var(--accent); color: var(--fg-on-accent); }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: var(--container-narrow); }
.section { padding-block: var(--section-y); position: relative; }
.stack > * + * { margin-top: var(--stack-gap, var(--space-4)); }
.cluster { display: flex; flex-wrap: wrap; gap: var(--cluster-gap, var(--space-3)); align-items: center; }
.section-head { display: grid; gap: var(--space-5); margin-bottom: var(--space-8); max-width: 980px; }

/* ---------- Tipografia ---------- */
h1, h2, h3, h4, h5, h6, p, figure, blockquote { margin: 0; }

.t-display,
.t-h1,
.t-h2 {
  font-family: var(--font-display);
  font-weight: 700;
  text-wrap: balance;
}
.t-display { font-size: var(--text-display); line-height: 0.9; letter-spacing: -0.035em; }
.t-h1 { font-size: var(--text-4xl); line-height: 0.95; letter-spacing: -0.035em; }
.t-h2 { font-size: var(--text-3xl); line-height: 1; letter-spacing: -0.03em; }
.t-h3 { font-size: var(--text-xl); line-height: var(--leading-snug); letter-spacing: var(--tracking-tight); font-weight: 500; text-wrap: balance; }
.t-lead { font-size: var(--text-lg); line-height: 1.45; color: var(--fg-soft); text-wrap: pretty; max-width: 60ch; }
.t-body { font-size: var(--text-md); line-height: var(--leading-relaxed); color: var(--fg-soft); text-wrap: pretty; max-width: 62ch; }
.t-small { font-size: var(--text-sm); color: var(--fg-mute); }

/* Big type: maiuscolo, pesante, interlinea compressa */
.t-giant {
  font-family: var(--font-display);
  font-size: var(--text-giant);
  font-weight: 800;
  line-height: var(--leading-giant);
  letter-spacing: var(--tracking-giant);
  text-transform: uppercase;
}
.t-wide { font-stretch: 125%; }
.t-condensed { font-stretch: 72%; }

/* Parola accento: serif italico, mai in maiuscolo */
.t-accent {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-stretch: 100%;
  font-synthesis: none;
  letter-spacing: -0.01em;
  text-transform: none;
  color: var(--accent);
}
:is(.t-giant, .t-display, .t-h1) .t-accent { font-size: 1.08em; letter-spacing: -0.035em; }

.t-gradient {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.t-outline {
  color: transparent;
  -webkit-text-stroke: 1px color-mix(in oklab, var(--fg) 35%, transparent);
}

/* Eyebrow mono: linguaggio da strumento tecnico */
.t-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--fg-mute);
}
.t-eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}
.t-eyebrow b { color: var(--accent); font-weight: 500; }

.t-mono { font-family: var(--font-mono); font-size: 0.92em; letter-spacing: 0; }

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

/* Gruppi di campi senza la cornice del browser: il raggruppamento lo danno legend e spaziature */
fieldset { margin: 0; padding: 0; border: 0; min-width: 0; }
legend { padding: 0; }