/* La pagina di presentazione di GridFly.
 *
 * Stessi gettoni del prodotto (ADR-004, ADR-009): notte, ciano, magenta;
 * Space Grotesk per i titoli, Inter per il testo, JetBrains Mono per le
 * cifre. Nessuna ombra sugli stati attivi, nessun bagliore: il colore e il
 * peso fanno il lavoro. */

@font-face { font-family: 'Space Grotesk'; font-weight: 500; font-display: swap; src: url(fonts/space-grotesk-latin-500-normal.woff2) format('woff2'); }
@font-face { font-family: 'Space Grotesk'; font-weight: 600; font-display: swap; src: url(fonts/space-grotesk-latin-600-normal.woff2) format('woff2'); }
@font-face { font-family: 'Space Grotesk'; font-weight: 700; font-display: swap; src: url(fonts/space-grotesk-latin-700-normal.woff2) format('woff2'); }
@font-face { font-family: 'Inter'; font-weight: 400; font-display: swap; src: url(fonts/inter-latin-400-normal.woff2) format('woff2'); }
@font-face { font-family: 'Inter'; font-weight: 500; font-display: swap; src: url(fonts/inter-latin-500-normal.woff2) format('woff2'); }
@font-face { font-family: 'JetBrains Mono'; font-weight: 500; font-display: swap; src: url(fonts/jetbrains-mono-latin-500-normal.woff2) format('woff2'); }

:root {
  --notte: #0a0e15;
  --notte-2: #0f1520;
  --scheda: #151d2b;
  --filo: rgba(150, 180, 220, 0.12);
  --filo-forte: rgba(150, 180, 220, 0.22);
  --inchiostro: #e9eff7;
  --inchiostro-2: #aab6c8;
  --inchiostro-3: #7d8ca3;
  --ciano: #38e0ff;
  --ciano-2: #087fa1;
  --ciano-inchiostro: #06232b;
  --magenta: #ff4fd8;
  --s4: #ff5d5d;
  --s3: #ffa03a;
  --vetro: rgba(10, 14, 21, 0.72);
  --vetro-filo: rgba(150, 180, 220, 0.18);
  --carta: #f3f5f9;
  --carta-scheda: #ffffff;
  --carta-inchiostro: #0b1220;
  --carta-inchiostro-2: #3a4a63;
  --carta-inchiostro-3: #6b7a92;
  --carta-filo: #dfe5ee;
  --f-display: 'Space Grotesk', Inter, system-ui, sans-serif;
  --f-ui: Inter, system-ui, sans-serif;
  --f-mono: 'JetBrains Mono', ui-monospace, monospace;
  --r2: 8px;
  --r3: 12px;
  --r4: 18px;
  --larghezza: 1200px;
  --lato: clamp(20px, 5vw, 64px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--notte);
  color: var(--inchiostro);
  font: 400 16px/1.55 var(--f-ui);
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; font-family: var(--f-display); letter-spacing: -0.02em; }
p { margin: 0; }
.mono { font-family: var(--f-mono); font-size: 0.78em; letter-spacing: 0.08em; text-transform: uppercase; }
.acc { color: var(--ciano); }
.s4 { color: var(--s4); }
.tenue { color: var(--inchiostro-3); }

.salta {
  position: absolute; left: -999px; top: 8px; z-index: 100;
  padding: 8px 12px; background: var(--ciano); color: var(--ciano-inchiostro); border-radius: var(--r2);
}
.salta:focus { left: 8px; }

/* ------------------------------------------------------------------ testata */
.testata {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 32px;
  height: 64px; padding: 0 var(--lato);
  background: var(--vetro);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--filo);
}
.testata::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -1px; height: 1px;
  background: linear-gradient(90deg, var(--ciano) 0, var(--ciano) 140px, transparent 420px);
}
.marchio { display: inline-flex; align-items: center; gap: 10px; font: 600 18px var(--f-display); letter-spacing: -0.02em; }
.marchio em { font-style: normal; color: var(--ciano); }
.menu { display: flex; gap: 6px; margin-left: 8px; }
.menu a { padding: 8px 12px; border-radius: var(--r2); color: var(--inchiostro-2); font-weight: 500; font-size: 14px; }
.menu a:hover, .menu a.on { color: var(--inchiostro); background: var(--filo); }
.testata-azioni { display: flex; gap: 8px; margin-left: auto; }

.tasto {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 36px; padding: 0 14px; border-radius: var(--r2);
  font: 500 14px var(--f-ui); white-space: nowrap;
  border: 1px solid transparent; transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.tasto.grande { height: 46px; padding: 0 20px; font-size: 15px; }
.tasto-pieno { background: var(--ciano); color: var(--ciano-inchiostro); font-weight: 600; }
.tasto-pieno:hover { background: #7bebff; }
.tasto-vetro { border-color: var(--filo-forte); color: var(--inchiostro); background: var(--notte); }
.tasto-vetro:hover { background: var(--filo); border-color: var(--inchiostro-3); }

/* ----------------------------------------------------------------- apertura */
.apertura {
  position: relative; overflow: hidden;
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 48px; align-items: center;
  min-height: calc(100vh - 64px);
  padding: clamp(48px, 8vh, 96px) var(--lato) clamp(48px, 8vh, 96px);
  max-width: calc(var(--larghezza) + 2 * var(--lato) + 160px); margin: 0 auto;
}
.apertura-cielo {
  position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; pointer-events: none;
}
.traccia { fill: none; stroke: var(--ciano); stroke-width: 1.4; stroke-dasharray: 6 9; opacity: 0.75; animation: scorri 18s linear infinite; }
.traccia-2 { stroke-width: 1; opacity: 0.3; stroke-dasharray: none; animation: none; }
@keyframes scorri { to { stroke-dashoffset: -300; } }
.cartellino { font: 500 12px var(--f-mono); letter-spacing: 0.06em; }
.riquadro { opacity: 0.9; }
.apertura-testo, .apertura-schermo { position: relative; z-index: 1; }
/* Le tracce e il reticolo stanno dietro, e sotto il testo si spengono: una
 * macchia di notte sfumata dietro la colonna del testo, cosi' le linee non
 * attraversano le parole e i tasti. */
.apertura-testo { isolation: isolate; }
.apertura-testo::before {
  content: ''; position: absolute; z-index: -1; inset: -60px -80px -90px -200px;
  background: radial-gradient(ellipse at 45% 50%, var(--notte) 0 52%, rgba(10, 14, 21, 0) 100%);
  pointer-events: none;
}

.sopratitolo { font: 500 12px/1.4 var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ciano); margin-bottom: 18px; }
.apertura h1 { font-size: clamp(40px, 5.2vw, 72px); line-height: 1.02; font-weight: 700; letter-spacing: -0.035em; }
.guida { margin-top: 22px; max-width: 56ch; color: var(--inchiostro-2); font-size: clamp(16px, 1.25vw, 18px); line-height: 1.6; }
.azioni { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 32px; }

.cifre {
  display: grid; grid-template-columns: repeat(4, auto); gap: 24px 32px;
  margin: 44px 0 0; padding-top: 24px; border-top: 1px solid var(--filo);
}
.cifre div { min-width: 0; }
.cifre div { display: flex; flex-direction: column; justify-content: flex-end; }
.cifre dt { font: 500 11px/1.3 var(--f-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--inchiostro-3); }
.cifre dd { margin: 6px 0 0; font: 600 22px/1.1 var(--f-display); letter-spacing: -0.02em; font-variant-numeric: tabular-nums; white-space: nowrap; }

.apertura-schermo { margin: 0; perspective: 1600px; }
.cornice {
  overflow: hidden; border-radius: var(--r3);
  border: 1px solid var(--filo-forte); background: var(--scheda);
  box-shadow: 0 40px 100px -30px rgba(0, 0, 0, 0.75);
}
.cornice-barra {
  display: flex; align-items: center; gap: 6px; height: 34px; padding: 0 12px;
  background: var(--notte-2); border-bottom: 1px solid var(--filo);
}
.cornice-barra span { width: 9px; height: 9px; border-radius: 50%; background: var(--filo-forte); }
.cornice-barra b { margin-left: 10px; font: 500 11px var(--f-mono); letter-spacing: 0.04em; color: var(--inchiostro-3); font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
[data-inclina] .cornice { transform: rotateY(-8deg) rotateX(3deg); transform-origin: left center; transition: transform 0.9s cubic-bezier(0.2, 0.7, 0.2, 1); }
[data-inclina].piatto .cornice { transform: none; }
.etichetta-hud {
  position: absolute; left: 24px; bottom: -18px;
  padding: 10px 14px; border-radius: var(--r2);
  background: var(--vetro); border: 1px solid var(--vetro-filo);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  font: 500 14px var(--f-display); letter-spacing: -0.01em; white-space: nowrap;
}
.etichetta-hud .mono { color: var(--inchiostro-3); margin-right: 2px; }

/* ----------------------------------------------------------------- sezioni */
.sezione { max-width: calc(var(--larghezza) + 2 * var(--lato)); margin: 0 auto; padding: clamp(72px, 10vh, 128px) var(--lato); }
.sezione-larga { max-width: calc(var(--larghezza) + 2 * var(--lato) + 160px); }
.sezione-scura { position: relative; }
.sezione-scura::before {
  content: ''; position: absolute; inset: 0 -100vw; z-index: -1;
  background: var(--notte-2);
  border-top: 1px solid var(--filo); border-bottom: 1px solid var(--filo);
}
.sezione-testa { max-width: 760px; }
.sezione h2 { font-size: clamp(30px, 3.4vw, 46px); line-height: 1.08; font-weight: 600; letter-spacing: -0.03em; }
.sezione .guida { font-size: 17px; }
h3 { font-size: 20px; font-weight: 600; line-height: 1.25; letter-spacing: -0.015em; }

/* rivelazione allo scorrimento */
[data-rivela] { opacity: 0; transform: translateY(18px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1); }
[data-rivela].visto { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-rivela] { opacity: 1; transform: none; transition: none; }
  .traccia { animation: none; }
  [data-inclina] .cornice { transform: none; }
  html { scroll-behavior: auto; }
}

/* ------------------------------------------------------------------- passi */
.passi {
  list-style: none; margin: 56px 0 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px;
  background: var(--filo); border: 1px solid var(--filo); border-radius: var(--r4); overflow: hidden;
}
.passi li { padding: 28px 26px 32px; background: var(--notte); }
.passi li:nth-child(n + 2) { transition-delay: calc(var(--i, 1) * 0.06s); }
.passo-n { display: block; color: var(--ciano); font-size: 13px; margin-bottom: 40px; }
.passi h3 { margin-bottom: 10px; }
.passi p { color: var(--inchiostro-2); font-size: 15px; }

/* ---------------------------------------------------------------- galleria */
.galleria { margin-top: 48px; }
.galleria-schede {
  display: flex; gap: 2px; overflow-x: auto; scrollbar-width: none;
  border-bottom: 1px solid var(--filo); margin-bottom: 28px;
}
.galleria-schede::-webkit-scrollbar { display: none; }
.galleria-schede button {
  appearance: none; background: none; border: 0; border-bottom: 2px solid transparent; margin-bottom: -1px;
  padding: 12px 16px; color: var(--inchiostro-3); font: 500 14px var(--f-ui); cursor: pointer; white-space: nowrap;
}
.galleria-schede button:hover { color: var(--inchiostro); }
.galleria-schede button[aria-selected='true'] { color: var(--inchiostro); font-weight: 600; border-bottom-color: var(--ciano); }
.galleria-corpo { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 40px; align-items: start; }
.cornice-galleria { box-shadow: none; }
.cornice-galleria img { transition: opacity 0.25s ease; }
.cornice-galleria img.sfuma { opacity: 0; }
.galleria-didascalie { position: sticky; top: 96px; padding-top: 4px; }
.galleria-didascalie h3 { font-size: 22px; margin-bottom: 12px; }
.galleria-didascalie p { color: var(--inchiostro-2); font-size: 15px; }

/* ------------------------------------------------------------------- banco */
.banco-griglia { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: center; }
.strumento {
  border: 1px solid var(--filo-forte); border-radius: var(--r4); background: var(--notte); padding: 24px;
}
.strumento-plancia { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.strumento-plancia div { padding: 14px 16px; border-radius: var(--r2); background: var(--scheda); }
.strumento-plancia .mono { display: block; color: var(--inchiostro-3); font-size: 10px; margin-bottom: 8px; }
.strumento-plancia b { font: 600 26px/1 var(--f-display); letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.strumento-scala { position: relative; height: 36px; margin: 22px 8px 6px; }
.scala-linea { position: absolute; left: 0; right: 0; top: 50%; height: 2px; background: linear-gradient(90deg, var(--s4) 0 30%, var(--s3) 30% 45%, var(--inchiostro-3) 45%); opacity: 0.8; border-radius: 1px; }
.soglia { position: absolute; left: 45%; top: 4px; bottom: 4px; width: 2px; background: var(--inchiostro); }
.soglia::after { content: 'norma 3,22 m'; position: absolute; left: 8px; top: -2px; font: 500 10px var(--f-mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--inchiostro-3); white-space: nowrap; }
.tacca { position: absolute; top: 50%; width: 14px; height: 14px; border-radius: 50%; transform: translate(-50%, -50%); background: var(--s4); border: 3px solid var(--notte); outline: 2px solid var(--s4); }
.strumento-tasti { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 20px; color: var(--inchiostro-2); font-size: 13px; }
.strumento-tasti span { display: inline-flex; align-items: center; gap: 6px; }
kbd {
  display: inline-grid; place-items: center; min-width: 22px; height: 22px; padding: 0 6px;
  border: 1px solid var(--filo-forte); border-radius: 5px; background: var(--scheda);
  font: 500 11px var(--f-mono); color: var(--inchiostro);
}
.strumento-tasti .annulla kbd { border-color: var(--ciano-2); color: var(--ciano); }

.tre { list-style: none; margin: 64px 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px; }
.tre h3 { margin-bottom: 10px; }
.tre p { color: var(--inchiostro-2); font-size: 15px; }

/* ---------------------------------------------------------------- principi */
.principi { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin-top: 48px; }
.principi article { padding: 28px; border: 1px solid var(--filo); border-radius: var(--r4); background: var(--notte-2); }
.principi .n { display: block; color: var(--ciano); font-size: 12px; margin-bottom: 26px; }
.principi h3 { margin-bottom: 10px; }
.principi p { color: var(--inchiostro-2); font-size: 15px; }

/* -------------------------------------------------------------------- dati */
.dati { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 56px; align-items: start; }
.elenco-dati { list-style: none; margin: 0; padding: 0; display: grid; gap: 1px; background: var(--filo); border: 1px solid var(--filo); border-radius: var(--r4); overflow: hidden; }
.elenco-dati li { padding: 18px 22px; background: var(--notte); color: var(--inchiostro-2); font-size: 15px; }
.elenco-dati b { color: var(--inchiostro); font-weight: 600; }

/* ---------------------------------------------------------------- chiusura */
.chiusura { position: relative; padding: clamp(80px, 12vh, 140px) var(--lato); text-align: center; overflow: hidden; }
.chiusura::before {
  content: ''; position: absolute; left: 50%; top: 0; width: 1200px; height: 100%; transform: translateX(-50%);
  background: radial-gradient(ellipse at 50% 100%, rgba(8, 127, 161, 0.35), transparent 60%);
  pointer-events: none;
}
.chiusura-corpo { position: relative; max-width: 680px; margin: 0 auto; display: grid; justify-items: center; }
.chiusura h2 { margin-top: 24px; font-size: clamp(32px, 4vw, 52px); font-weight: 700; letter-spacing: -0.035em; }
.chiusura .guida { text-align: center; }
.chiusura .azioni { justify-content: center; }

.pie { display: grid; gap: 12px; padding: 40px var(--lato) 48px; border-top: 1px solid var(--filo); color: var(--inchiostro-3); font-size: 13px; }
.pie .mono { font-size: 12px; text-transform: none; letter-spacing: 0.04em; }
.pie a:hover { color: var(--inchiostro); }

/* -------------------------------------------------------------- adattamenti */
@media (max-width: 1100px) {
  .apertura { grid-template-columns: 1fr; gap: 56px; min-height: 0; }
  [data-inclina] .cornice { transform: none; }
  .apertura-schermo { max-width: 900px; }
  .passi { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .galleria-corpo { grid-template-columns: 1fr; gap: 24px; }
  .galleria-didascalie { position: static; }
  .banco-griglia, .dati { grid-template-columns: 1fr; gap: 40px; }
  .tre { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 720px) {
  .menu { display: none; }
  .testata { gap: 12px; }
  .apertura h1 { font-size: 40px; }
  .cifre { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .passi, .principi { grid-template-columns: 1fr; }
  .strumento-plancia { grid-template-columns: 1fr; }
  .etichetta-hud { position: static; margin-top: 12px; display: inline-block; }
}