/* ============================================================================
   Natorlab — pagina di attesa
   Direzione visiva: spazio profondo, tipografia sottile e molto spaziata,
   un solo accento caldo (il disco di accremento). Nessuna risorsa esterna.
   ========================================================================= */

/* ------------------------------------------------------------------- font */
/*
 * Astera v2 — designer: Kira Polyarush (dafont.com, 2013).
 * Il file è incluso nel sito: il carattere non viene richiesto a server
 * esterni, come richiede la piattaforma di pubblicazione.
 * Licenza dichiarata dall'autrice: "Free for personal use"; il campo licenza
 * interno al file riporta "CUSTOM". Per un uso commerciale serve il permesso
 * dell'autrice. Per sostituirlo basta cambiare il file in assets/fonts/ e
 * aggiornare il percorso qui sotto: il resto del foglio di stile non cambia.
 */
@font-face {
  font-family: 'Astera Natorlab';
  src: url('../fonts/astera-v2.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --fondo:        #04060A;
  --fondo-alto:   #0A0F16;
  --testo:        #E9EFF5;
  --testo-2:      #C2CDD8;
  --testo-3:      #8B97A4;
  --ambra:        #E0A05A;
  --ambra-tenue:  rgba(224, 160, 90, .18);
  --filo:         rgba(194, 205, 216, .14);
  --filo-tenue:   rgba(194, 205, 216, .07);

  --font: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system,
          "Helvetica Neue", Arial, sans-serif;
  /* Carattere del marchio: usato per il titolo e la firma in alto. */
  --font-marchio: "Astera Natorlab", "Segoe UI Variable Display", "Segoe UI",
                  system-ui, -apple-system, sans-serif;

  --misura: 62ch;
  --largo:  1180px;

  --dur: .8s;
  --curva: cubic-bezier(.22, .61, .36, 1);
}

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

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

body {
  margin: 0;
  min-height: 100%;
  background: var(--fondo);
  color: var(--testo);
  font-family: var(--font);
  font-weight: 300;
  font-size: clamp(1rem, .95rem + .25vw, 1.125rem);
  line-height: 1.75;
  letter-spacing: .005em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ---------------------------------------------------------------- elementi */

#spazio {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 0;
}

/* Grana sottile: dà corpo al nero senza introdurre file esterni. */
.grana {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .30;
  mix-blend-mode: soft-light;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='g'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='160' height='160' filter='url(%23g)' opacity='.5'/></svg>");
}

/* Velo: protegge la leggibilità dei testi. La fascia centrale e bassa, dove
   poggia il contenuto, viene scurita in modo deciso; il buco nero resta nitido
   nella parte alta della pagina. */
.velo {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    radial-gradient(115% 78% at 50% 30%, rgba(4, 6, 10, 0) 26%, rgba(4, 6, 10, .58) 60%, rgba(4, 6, 10, .92) 100%),
    linear-gradient(to bottom,
      rgba(4, 6, 10, .50) 0%,
      rgba(4, 6, 10, 0) 14%,
      rgba(4, 6, 10, .30) 28%,
      rgba(4, 6, 10, .74) 40%,
      rgba(4, 6, 10, .93) 54%,
      rgba(4, 6, 10, .98) 70%,
      var(--fondo) 100%);
}

a { color: var(--testo); }

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

/* Il collegamento "salta al contenuto" resta nel riquadro della pagina
   (non a -9999px): è invisibile finché non riceve il focus da tastiera. */
.salta {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 50;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  padding: 0;
  background: var(--testo);
  color: var(--fondo);
  text-decoration: none;
}

.salta:focus-visible,
.salta:focus {
  width: auto;
  height: auto;
  clip-path: none;
  padding: 12px 18px;
}

/* ------------------------------------------------------------------ barra */

.barra {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 10;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: clamp(1.1rem, 2.4vw, 2rem) clamp(1.25rem, 4vw, 3.5rem);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  background: linear-gradient(to bottom, rgba(4, 6, 10, .72), rgba(4, 6, 10, 0));
}

.marchio {
  margin: 0;
  font-family: var(--font-marchio);
  font-size: clamp(.86rem, .8rem + .28vw, 1.05rem);
  font-weight: 400;
  letter-spacing: .28em;
  text-transform: uppercase;
  text-indent: .28em;
}

.barra__riga {
  margin: 0;
  font-size: clamp(.66rem, .62rem + .18vw, .78rem);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--testo-3);
}

/* ---------------------------------------------------------------- apertura */

main { position: relative; z-index: 5; }

.apertura {
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  padding: clamp(6rem, 14vh, 10rem) clamp(1.25rem, 4vw, 3.5rem) clamp(3.5rem, 9vh, 7rem);
}

.apertura__testo {
  width: 100%;
  max-width: var(--largo);
  margin: 0 auto;
}

.occhiello {
  display: inline-flex;
  align-items: center;
  gap: .7em;
  margin: 0 0 clamp(1.4rem, 3vh, 2.2rem);
  font-size: clamp(.68rem, .64rem + .18vw, .78rem);
  letter-spacing: .38em;
  text-transform: uppercase;
  color: var(--testo-2);
}

.punto {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ambra);
  box-shadow: 0 0 0 0 var(--ambra-tenue);
  animation: battito 4.6s var(--curva) infinite;
}

@keyframes battito {
  0%, 100% { box-shadow: 0 0 0 0 rgba(224, 160, 90, .30); opacity: 1; }
  60%      { box-shadow: 0 0 0 12px rgba(224, 160, 90, 0); opacity: .75; }
}

h1 {
  margin: 0 0 clamp(1.6rem, 3.5vh, 2.6rem);
  font-family: var(--font-marchio);
  font-size: clamp(2.15rem, 10.5vw, 8.2rem);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: clamp(.02em, .55vw, .085em);
  text-transform: uppercase;
  text-indent: clamp(.02em, .55vw, .085em);
  background: linear-gradient(180deg, #FFFFFF 0%, #E9EFF5 42%, #9FB0C0 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.guida {
  max-width: var(--misura);
  margin: 0 0 clamp(2rem, 5vh, 3.4rem);
  font-size: clamp(1rem, .95rem + .4vw, 1.3rem);
  font-weight: 300;
  color: var(--testo-2);
}

.stato {
  margin: 0;
  padding-top: clamp(1.1rem, 2.6vh, 1.7rem);
  border-top: 1px solid var(--filo);
  font-size: clamp(1rem, .9rem + .9vw, 1.75rem);
  font-weight: 200;
  letter-spacing: .42em;
  text-transform: uppercase;
  color: var(--ambra);
  text-indent: .42em;
}

/* Dicitura internazionale, in secondo piano rispetto alla versione italiana. */
.stato__secondario {
  margin: .7em 0 0;
  font-size: clamp(.66rem, .62rem + .2vw, .78rem);
  font-weight: 300;
  letter-spacing: .42em;
  text-transform: uppercase;
  color: var(--testo-3);
  text-indent: .42em;
}

/* ------------------------------------------------------------------ ambiti */

.ambiti,
.nota {
  max-width: var(--largo);
  margin: 0 auto;
  padding: clamp(3.5rem, 9vh, 7rem) clamp(1.25rem, 4vw, 3.5rem);
}

.titolo-sezione {
  margin: 0 0 clamp(2rem, 5vh, 3.2rem);
  font-size: clamp(1.05rem, .95rem + .7vw, 1.6rem);
  font-weight: 200;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--testo-3);
}

.griglia {
  display: grid;
  gap: clamp(1.2rem, 2.6vw, 2.2rem);
  grid-template-columns: 1fr;
}

.scheda {
  padding: clamp(1.5rem, 3.2vw, 2.6rem);
  border: 1px solid var(--filo);
  border-radius: 4px;
  background: linear-gradient(160deg, rgba(233, 239, 245, .045), rgba(233, 239, 245, .012));
}

.scheda__numero {
  margin: 0 0 1.2rem;
  font-size: .78rem;
  letter-spacing: .32em;
  color: var(--ambra);
}

.scheda h3 {
  margin: 0 0 .9rem;
  font-size: clamp(1.15rem, 1rem + .8vw, 1.55rem);
  font-weight: 300;
  letter-spacing: .1em;
  color: var(--testo);
}

.scheda p {
  margin: 0;
  color: var(--testo-2);
  max-width: 52ch;
}

.nota p {
  max-width: var(--misura);
  color: var(--testo-2);
}

.nota strong { font-weight: 400; color: var(--testo); }

/* ------------------------------------------------- comando di animazione */
/*
 * Controllo di pausa per il contenuto in movimento: le linee guida di
 * accessibilita lo richiedono quando qualcosa si anima da solo.
 */
.comando {
  position: fixed;
  right: clamp(1rem, 3vw, 2.2rem);
  bottom: clamp(1rem, 3vw, 2.2rem);
  z-index: 20;
  display: inline-flex;
  align-items: center;
  gap: .6em;
  min-height: 40px;
  padding: .55em 1.05em;
  border: 1px solid var(--filo);
  border-radius: 999px;
  background: rgba(4, 6, 10, .72);
  backdrop-filter: blur(7px);
  -webkit-backdrop-filter: blur(7px);
  color: var(--testo-2);
  font-family: var(--font);
  font-size: clamp(.68rem, .64rem + .18vw, .78rem);
  font-weight: 400;
  letter-spacing: .16em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color var(--dur) var(--curva), border-color var(--dur) var(--curva), background-color var(--dur) var(--curva);
}

.comando:hover {
  color: var(--testo);
  border-color: rgba(194, 205, 216, .32);
  background: rgba(10, 15, 22, .86);
}

.comando__segno {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--ambra);
  box-shadow: 0 0 8px rgba(224, 160, 90, .55);
  transition: background-color var(--dur) var(--curva), box-shadow var(--dur) var(--curva);
}

/* quando l'animazione e in pausa il segno diventa un triangolo di ripresa */
.comando[aria-pressed="true"] .comando__segno {
  width: 0;
  height: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  border-left: 9px solid var(--ambra);
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
}

/* ------------------------------------------------------------------- piede */

.piede {
  position: relative;
  z-index: 5;
  border-top: 1px solid var(--filo-tenue);
  padding: clamp(2rem, 5vh, 3.2rem) clamp(1.25rem, 4vw, 3.5rem) clamp(2.6rem, 6vh, 4rem);
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 2rem;
  justify-content: space-between;
  max-width: var(--largo);
  margin: 0 auto;
}

.piede__riga {
  margin: 0;
  font-size: clamp(.74rem, .7rem + .18vw, .84rem);
  letter-spacing: .12em;
  color: var(--testo-3);
}

.piede__riga--tenue { color: var(--testo-3); }

/* ---------------------------------------------------------------- ingresso */

.entra {
  opacity: 0;
  transform: translate3d(0, 14px, 0);
  animation: entra var(--dur) var(--curva) forwards;
}

.entra--2 { animation-delay: .28s; }
.entra--3 { animation-delay: .46s; }
.entra--4 { animation-delay: .64s; }

@keyframes entra {
  to { opacity: 1; transform: none; }
}

/* ------------------------------------------------------------- adattamenti */

@media (min-width: 860px) {
  .griglia { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
  .barra { flex-direction: column; gap: .35rem; align-items: flex-start; }
  .barra__riga { letter-spacing: .16em; }
  .marchio { letter-spacing: .22em; text-indent: .22em; }
  h1 { letter-spacing: .02em; text-indent: .02em; }
  .stato { letter-spacing: .3em; text-indent: .3em; }
  .apertura { align-items: flex-end; }
  .comando { min-height: 44px; }
  .piede { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  .entra { opacity: 1; transform: none; animation: none; }
  .punto { animation: none; }
}

@media (prefers-contrast: more) {
  :root {
    --testo-3: #A9B4C0;
    --filo: rgba(194, 205, 216, .3);
  }
}