@charset "UTF-8";
/* ============================================================================
   Vincent Marcello — consulenza sistemi informatici e formazione IT
   css/styles.css — design system "carta e inchiostro" (macchina da scrivere)

   Palette e contrasti verificati (WCAG 2.1 AA, calcolati sulla coppia dichiarata):
     inchiostro su carta ............ 15.13:1
     inchiostro-tenue su carta ....... 8.38:1
     timbro su carta ................. 7.45:1
     timbro su carta-vecchia ......... 6.27:1
     timbro-scuro su carta ........... 9.81:1
     inchiostro su carta-vecchia ..... 12.75:1
     carta-su-timbro su timbro ....... 7.45:1
     fuoco su carta ................. 10.21:1  (anello di focus, non-testo)
     fuoco su carta-vecchia .......... 8.60:1  (anello di focus, non-testo)
   ============================================================================ */

:root {
  /* --- palette (9 token congelati) --- */
  --carta: #F4EFE3;
  --carta-vecchia: #E6DCC6;
  --inchiostro: #1C1A17;
  --inchiostro-tenue: #4A443C;
  --timbro: #8C2A16;
  --timbro-scuro: #6E1F0F;
  --fuoco: #123A5E;
  --carta-su-timbro: #F4EFE3;
  --bordo: #C9BCA2;

  /* --- texture e tempo --- */
  --grana-opacita: .05;
  --tempo-battuta: 1.06s;
  --fibra: rgba(28, 26, 23, .045);

  /* --- tipografia: macchina da scrivere --- */
  --font-testo: "Courier Prime", "Courier Prime Fallback", "Courier New", Courier, ui-monospace, "Cascadia Mono", Consolas, "DejaVu Sans Mono", monospace;
  --font-display: "Cutive Mono", "Courier Prime", "Courier New", Courier, ui-monospace, monospace;
  --scala-display: clamp(2.25rem, 6vw, 4rem);
  --scala-h2: clamp(1.6rem, 3.5vw, 2.25rem);
  --scala-h3: 1.15rem;
  --scala-corpo: 1.0625rem;
  --scala-piccola: .9375rem;
  --interlinea: 1.62;

  /* --- spaziatura e struttura --- */
  --sp-1: .25rem;
  --sp-2: .5rem;
  --sp-3: .875rem;
  --sp-4: 1.25rem;
  --sp-5: 2rem;
  --sp-6: 3.25rem;
  --sp-7: 5rem;
  --raggio: 2px;
  --larghezza-max: 68rem;
  --ombra-carta: 0 1px 0 rgba(28, 26, 23, .10), 0 12px 28px -18px rgba(28, 26, 23, .38);
}

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

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

body {
  margin: 0;
  background-color: var(--carta);
  color: var(--inchiostro);
  font-family: var(--font-testo);
  font-size: var(--scala-corpo);
  line-height: var(--interlinea);
  letter-spacing: .005em;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
  hyphens: auto;
}

/* --- grana della carta: overlay inerte, sotto il contenuto --- */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: var(--grana-opacita);
  background-color: transparent;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23g)'/%3E%3C/svg%3E"),
    repeating-linear-gradient(0deg, var(--fibra) 0 1px, transparent 1px 4px);
  background-size: 180px 180px, auto;
}

/* il contenuto vive sopra la grana */
body > * { position: relative; z-index: 1; }

/* --- tipografia --- */
h1, h2 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.18;
  letter-spacing: .01em;
  margin: 0 0 var(--sp-4);
  text-wrap: balance;
}

h1 { font-size: var(--scala-display); }
h2 { font-size: var(--scala-h2); }

h3 {
  font-family: var(--font-display);
  font-size: var(--scala-h3);
  letter-spacing: .02em;
  margin: var(--sp-4) 0 var(--sp-2);
}

p { margin: 0 0 var(--sp-4); max-width: 62ch; }
ul, ol { margin: 0 0 var(--sp-4); padding-left: 1.35em; }
li + li { margin-top: var(--sp-1); }

a {
  color: var(--timbro);
  text-decoration-thickness: 1px;
  text-underline-offset: .18em;
}
a:hover { color: var(--timbro-scuro); text-decoration-thickness: 2px; }

strong { font-weight: 700; }

small, .nota { font-size: var(--scala-piccola); letter-spacing: .02em; }

blockquote {
  margin: var(--sp-5) 0;
  padding: var(--sp-3) var(--sp-4);
  border-left: 3px solid var(--timbro);
  background: var(--carta-vecchia);
  font-style: italic;
}

hr {
  border: 0;
  border-top: 1px dashed var(--bordo);
  margin: var(--sp-6) 0;
}

code, kbd, samp {
  font-family: var(--font-testo);
  font-size: .95em;
  background: var(--carta-vecchia);
  padding: .08em .3em;
  border: 1px solid var(--bordo);
}

::selection { background: var(--inchiostro); color: var(--carta); }

/* --- accessibilità --- */
:focus-visible {
  outline: 3px solid var(--fuoco);
  outline-offset: 3px;
  border-radius: var(--raggio);
}

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

.skip-link {
  position: absolute;
  left: var(--sp-3);
  top: -3.2rem;
  z-index: 20;
  padding: var(--sp-2) var(--sp-3);
  background: var(--inchiostro);
  color: var(--carta);
  text-decoration: none;
  transition: top .15s ease-out;
}
.skip-link:focus { top: var(--sp-3); }

/* --- etichette in stile "timbrato" --- */
.etichetta {
  display: inline-block;
  font-family: var(--font-display);
  font-size: var(--scala-piccola);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--timbro);
  border-bottom: 1px solid currentColor;
  padding-bottom: var(--sp-1);
  margin-bottom: var(--sp-3);
}

/* --- movimento: cursore, battitura, inchiostro --- */
@keyframes cursore {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

@keyframes battitura {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes inchiostro {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.cursore::after {
  content: "";
  display: inline-block;
  width: .62ch;
  height: 1em;
  margin-left: .12em;
  vertical-align: -.12em;
  background: var(--timbro);
  animation: cursore var(--tempo-battuta) step-end infinite;
}

.battitura {
  display: inline-block;
  max-width: 100%;
  overflow: hidden;
  white-space: nowrap;
  animation: battitura 2.4s steps(46, end) 1 both;
}

.tratto-inchiostro {
  display: block;
  height: 2px;
  width: 6.5rem;
  background: var(--timbro);
  transform-origin: left center;
  animation: inchiostro .9s ease-out .35s 1 both;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition-duration: .01ms !important;
    transition-delay: 0s !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
  .battitura { white-space: normal; }
}

/* --- pulsanti e moduli (base condivisa) --- */
.bottone {
  display: inline-block;
  min-height: 44px;
  padding: var(--sp-3) var(--sp-4);
  font-family: var(--font-testo);
  font-size: var(--scala-corpo);
  letter-spacing: .04em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--carta-su-timbro);
  background: var(--timbro);
  border: 1px solid var(--timbro);
  border-radius: var(--raggio);
  cursor: pointer;
}
.bottone:hover,
.bottone:focus-visible {
  background: var(--timbro-scuro);
  border-color: var(--timbro-scuro);
  color: var(--carta-su-timbro);
}
.bottone--chiaro {
  background: transparent;
  color: var(--inchiostro);
  border-color: var(--inchiostro);
}
.bottone--chiaro:hover,
.bottone--chiaro:focus-visible {
  background: var(--inchiostro);
  color: var(--carta);
}

/* --- adattività --- */
@media (max-width: 768px) {
  :root { --scala-corpo: 1.03125rem; }
  h1, h2 { letter-spacing: 0; }
}

@media (max-width: 480px) {
  :root { --sp-6: 2.5rem; --sp-7: 3.25rem; }
  .battitura { white-space: normal; animation: none; width: auto; }
}

@media print {
  body::before { display: none; }
  .site-header, .site-footer, .skip-link { display: none; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: var(--scala-piccola); }
}