/* Reset misurato, tipografia di base, elementi ricorrenti */

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

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

body {
  margin: 0;
  background: var(--ink-990);
  color: var(--silver);
  font-family: var(--font-text);
  font-size: var(--text-body);
  line-height: 1.65;
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Grana di carta: il biglietto da visita è stampato su cartoncino ruvido */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.5;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='0.35'/%3E%3C/svg%3E");
}

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

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 300;
  color: var(--white);
  margin: 0;
  line-height: 1.08;
  letter-spacing: var(--track-display);
  text-wrap: balance;
}

h1 {
  font-size: var(--text-display);
  font-weight: 200;
}

h2 {
  font-size: var(--text-h2);
}

h3 {
  font-size: var(--text-h3);
  line-height: 1.2;
}

p {
  margin: 0;
  max-width: 62ch;
}

a {
  color: inherit;
}

ul,
ol,
dl {
  margin: 0;
  padding: 0;
  list-style: none;
}

dd {
  margin: 0;
}

::selection {
  background: var(--white);
  color: var(--ink-990);
}

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

/* Contenitore */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--shell-pad);
}

.skip-link {
  position: absolute;
  inset-inline-start: 0.5rem;
  top: -4rem;
  z-index: 100;
  background: var(--white);
  color: var(--ink-990);
  padding: 0.6rem 1rem;
  font-size: var(--text-small);
  transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  top: 0.5rem;
}

/* Pulsanti */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 3rem;
  padding: 0 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.btn--solid {
  background: var(--white);
  color: var(--ink-990);
}

.btn--solid:hover {
  background: var(--silver);
}

.btn--outline {
  border-color: var(--line-strong);
  color: var(--white);
  background: transparent;
}

.btn--outline:hover {
  border-color: var(--white);
  background: rgba(246, 247, 248, 0.06);
}

.btn:active {
  transform: translateY(1px);
}

.btn--wide {
  width: 100%;
}

/* Filetto con nodo: il segno del marchio, riusato come divisore */
.rule-node {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin-bottom: 1.75rem;
  color: var(--silver-dim);
  font-size: var(--text-small);
  letter-spacing: 0.04em;
}

.rule-node::before {
  content: "";
  width: 5px;
  height: 5px;
  flex: none;
  border-radius: 50%;
  background: var(--glow);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.12), 0 0 12px 2px rgba(255, 255, 255, 0.5);
}

.rule-node::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line-strong), transparent);
}

/* Rivelazione allo scorrimento.
   Senza JavaScript il contenuto resta visibile: si nasconde solo se c'e'
   qualcuno che poi lo sa rivelare. */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 700ms var(--ease-out), transform 700ms var(--ease-out);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

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