/* ============================================================
   bAIt Agent — "Il perimetro"
   L'identita' del sito e' la stessa tesi del prodotto: fuori dal
   bordo il campo pulsa e sa tutto; dentro e' delimitato e ordinato.
   Registro da disegno tecnico: righe capello, squadre agli angoli,
   annotazioni in monospazio, angoli vivi.
   Nessuna dipendenza esterna: font self-hosted, CSP 'self'.
   ============================================================ */

@font-face {
  font-family: 'Archivo';
  src: url('fonts/archivo-500-700.woff2') format('woff2-variations'),
       url('fonts/archivo-500-700.woff2') format('woff2');
  font-weight: 500 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Plex Sans';
  src: url('fonts/plexsans-400-600.woff2') format('woff2-variations'),
       url('fonts/plexsans-400-600.woff2') format('woff2');
  font-weight: 400 600; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Plex Mono';
  src: url('fonts/plexmono-400.woff2') format('woff2');
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Plex Mono';
  src: url('fonts/plexmono-500.woff2') format('woff2');
  font-weight: 500; font-style: normal; font-display: swap;
}

/* ---------- token: carta (default) ---------- */
:root {
  --paper:     #fbfcfd;
  --paper-2:   #f2f5f8;
  --panel:     #ffffff;
  --rule:      #dde3ea;
  --rule-2:    #c3ccd8;
  --ink:       #0d1520;
  --ink-2:     #2f3d4e;
  --graphite:  #5a6878;
  --signal:    #1d5bd6;
  --signal-2:  #14459f;
  --signal-sf: #e8effc;
  --cut:       #c0334c;

  --field-base:   #fbfcfd;
  --field-signal: #1d5bd6;
  --field-gain:   0.72;

  --gem-deep:   #0a3f9e;
  --gem-bright: #4da3ff;
  --gem-sky:    #d4e4ff;

  --f-display: 'Archivo', ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --f-body:    'Plex Sans', ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --f-mono:    'Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --r: 4px;
  --wrap: 1140px;
  --tick: 15px;

  color-scheme: light dark;
}

/* ---------- token: inchiostro ---------- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:     #0d1520;
    --paper-2:   #111c2a;
    --panel:     #101a27;
    --rule:      #1e2c3d;
    --rule-2:    #2c3e55;
    --ink:       #e9eff6;
    --ink-2:     #c0cddc;
    --graphite:  #8595a8;
    --signal:    #6aa8ff;
    --signal-2:  #9cc6ff;
    --signal-sf: rgba(106,168,255,.12);
    --cut:       #ff7d92;

    --field-base:   #0d1520;
    --field-signal: #6aa8ff;
    --field-gain:   1.0;

    --gem-deep:   #0b3ea0;
    --gem-bright: #7bbcff;
    --gem-sky:    #24406e;
  }
}
:root[data-theme="dark"] {
  --paper:     #0d1520;
  --paper-2:   #111c2a;
  --panel:     #101a27;
  --rule:      #1e2c3d;
  --rule-2:    #2c3e55;
  --ink:       #e9eff6;
  --ink-2:     #c0cddc;
  --graphite:  #8595a8;
  --signal:    #6aa8ff;
  --signal-2:  #9cc6ff;
  --signal-sf: rgba(106,168,255,.12);
  --cut:       #ff7d92;

  --field-base:   #0d1520;
  --field-signal: #6aa8ff;
  --field-gain:   1.0;

  --gem-deep:   #0b3ea0;
  --gem-bright: #7bbcff;
  --gem-sky:    #24406e;
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; }
[hidden] { display: none !important; }

h1, h2, h3, h4 {
  font-family: var(--f-display);
  font-weight: 600;
  letter-spacing: -0.025em;
  text-wrap: balance;
  margin: 0;
}

a { color: var(--signal); text-underline-offset: 3px; }

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

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: 24px; }

.sr-only, .skip {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}
.skip:focus {
  width: auto; height: auto; clip-path: none; z-index: 100;
  top: 10px; left: 10px; padding: 10px 14px;
  background: var(--signal); color: var(--paper); border-radius: var(--r);
}

/* annotazione tecnica: l'etichetta in monospazio e' il tic ricorrente */
.mono {
  font-family: var(--f-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--graphite);
}

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.nav-in { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 62px; flex-wrap: wrap; }
.brand { display: flex; align-items: baseline; gap: 9px; text-decoration: none; color: inherit; }
.brand-mark { font-family: var(--f-display); font-size: 20px; font-weight: 700; letter-spacing: -0.04em; }
.brand-mark span { color: var(--signal); }
.brand-sub { font-family: var(--f-mono); font-size: 10.5px; letter-spacing: .18em; text-transform: uppercase; color: var(--graphite); }

.nav nav { display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
.nav nav a {
  color: var(--ink-2); text-decoration: none;
  font-family: var(--f-mono); font-size: 12px; letter-spacing: .06em; text-transform: uppercase;
  padding: 9px 11px; border-radius: var(--r);
  transition: color .16s, background .16s;
}
.nav nav a:hover { color: var(--ink); background: var(--paper-2); }
.nav-cta { color: var(--signal) !important; box-shadow: inset 0 0 0 1px var(--rule-2); }
.nav-cta:hover { background: var(--signal-sf) !important; box-shadow: inset 0 0 0 1px var(--signal); }

.theme-btn {
  display: inline-grid; place-items: center; width: 34px; height: 34px; margin-left: 6px;
  border: 1px solid var(--rule-2); border-radius: var(--r);
  background: transparent; color: var(--ink-2); cursor: pointer;
  transition: color .16s, border-color .16s, background .16s;
}
.theme-btn:hover { color: var(--signal); border-color: var(--signal); background: var(--signal-sf); }
.theme-btn svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; }
.theme-btn .i-moon { display: none; }
:root[data-theme="dark"] .theme-btn .i-moon { display: block; }
:root[data-theme="dark"] .theme-btn .i-sun  { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-btn .i-moon { display: block; }
  :root:not([data-theme="light"]) .theme-btn .i-sun  { display: none; }
}

/* ---------- hero: fuori il campo, dentro il perimetro ---------- */
.hero { position: relative; overflow: hidden; padding: clamp(26px, 4vw, 54px) 0 clamp(34px, 5vw, 66px); }
.hero-field { position: absolute; inset: 0; width: 100%; height: 100%; display: block; opacity: 0; transition: opacity 1.6s ease; }
.hero-field.on { opacity: 1; }

.frame {
  position: relative; z-index: 1;
  background: var(--panel);
  border: 1px solid var(--rule-2);
  padding: clamp(36px, 6vw, 82px) clamp(24px, 5vw, 66px) clamp(40px, 6vw, 72px);
  display: grid; grid-template-columns: 1fr; gap: clamp(34px, 4vw, 56px);
  align-items: start;
}
@media (min-width: 1000px) {
  .frame { grid-template-columns: minmax(0, 1fr) minmax(230px, 288px); }
}

/* cartiglio: come il riquadro dati di un disegno tecnico */
.spec { margin: 0; display: grid; border-top: 1px solid var(--rule-2); }
.spec > div { display: grid; gap: 3px; padding: 14px 0; border-bottom: 1px solid var(--rule); }
.spec dt { color: var(--signal); }
.spec dd { margin: 0; color: var(--ink-2); font-size: 15px; line-height: 1.45; }
/* squadre agli angoli: il segno del disegno tecnico */
/* fuori dal flusso: altrimenti diventa una cella della griglia */
.frame > .corner { position: absolute; inset: 0; pointer-events: none; }
.frame::before, .frame::after,
.frame > .corner::before, .frame > .corner::after {
  content: ""; position: absolute; width: var(--tick); height: var(--tick);
  border: 2px solid var(--signal); pointer-events: none;
}
.frame::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.frame::after  { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }
.frame > .corner::before { top: -1px; right: -1px; border-left: 0; border-bottom: 0; }
.frame > .corner::after  { bottom: -1px; left: -1px; border-right: 0; border-top: 0; }
.frame-tag {
  position: absolute; top: -1px; right: clamp(24px, 5vw, 66px);
  transform: translateY(-50%);
  background: var(--panel); padding: 0 10px;
}

h1 { font-size: clamp(33px, 5.6vw, 58px); line-height: 1.05; margin: 18px 0 22px; font-weight: 600; max-width: 17ch; }
.lead { margin: 0; max-width: 33em; color: var(--ink-2); font-size: clamp(17px, 2vw, 19.5px); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: var(--r);
  border: 1px solid var(--rule-2); background: transparent; color: var(--ink);
  font-family: var(--f-mono); font-size: 13px; letter-spacing: .05em; text-transform: uppercase;
  text-decoration: none; cursor: pointer;
  transition: border-color .16s, background .16s, color .16s;
}
.btn:hover { border-color: var(--signal); color: var(--signal); background: var(--signal-sf); }
.btn.primary { background: var(--signal); border-color: var(--signal); color: var(--paper); }
.btn.primary:hover { background: var(--signal-2); border-color: var(--signal-2); color: var(--paper); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ---------- sezioni ---------- */
.band { background: var(--paper-2); border-block: 1px solid var(--rule); }
.section { padding-block: clamp(54px, 7.5vw, 92px); }

.sec-head { display: grid; gap: 14px; margin-bottom: 40px; }
.sec-head .mono { color: var(--signal); }
.sec-title { font-size: clamp(25px, 3.6vw, 37px); line-height: 1.14; max-width: 18ch; }
.sec-lead { margin: 0; max-width: 36em; color: var(--ink-2); font-size: 17px; }

.grid-2 { display: grid; grid-template-columns: 1.02fr 1fr; gap: clamp(28px, 6vw, 72px); padding-block: clamp(54px, 7.5vw, 92px); }
@media (max-width: 840px) { .grid-2 { grid-template-columns: 1fr; } }
.grid-2 h2 { font-size: clamp(25px, 3.6vw, 37px); line-height: 1.16; }
.col-text { display: grid; gap: 18px; color: var(--ink-2); }
.col-text p { margin: 0; }

/* moduli: vista in pianta, righe capello condivise. Non card con ombra. */
.plan {
  display: grid; grid-template-columns: 1fr;
  gap: 1px; background: var(--rule); border: 1px solid var(--rule);
}
@media (min-width: 620px) {
  .plan { grid-template-columns: repeat(6, 1fr); }
  .plan .cell { grid-column: span 3; }
  .plan .cell:nth-child(5) { grid-column: span 6; }
}
@media (min-width: 900px) {
  .plan .cell { grid-column: span 2; }
  .plan .cell:nth-child(4), .plan .cell:nth-child(5) { grid-column: span 3; }
}
@media (min-width: 1180px) {
  .plan { grid-template-columns: repeat(5, 1fr); }
  .plan .cell, .plan .cell:nth-child(4), .plan .cell:nth-child(5) { grid-column: auto; }
}
.plan .cell { background: var(--panel); padding: 26px 24px 28px; position: relative; }
.plan .cell h4 { font-size: 17.5px; margin-bottom: 8px; }
.plan .cell p { margin: 0; color: var(--ink-2); font-size: 15.5px; line-height: 1.55; }

.chips { display: flex; flex-wrap: wrap; gap: 9px; }
.chip {
  padding: 8px 15px; border: 1px solid var(--rule-2); border-radius: var(--r);
  font-family: var(--f-mono); font-size: 12.5px; color: var(--ink-2); background: transparent;
}
.chip.open { border-style: dashed; color: var(--graphite); }

.note {
  margin: 34px 0 0; padding: 18px 0 0; border-top: 1px solid var(--rule-2);
  color: var(--ink-2); font-size: 16px; max-width: 46em;
}

.facts { list-style: none; margin: 0; padding: 0; display: grid; }
.facts li {
  display: grid; grid-template-columns: minmax(200px, 300px) 1fr; gap: 8px 36px;
  padding: 22px 0; border-top: 1px solid var(--rule);
}
.facts li:last-child { border-bottom: 1px solid var(--rule); }
@media (max-width: 800px) { .facts li { grid-template-columns: 1fr; gap: 5px; } }
.facts h4 { margin: 0; font-size: 17px; }
.facts p { margin: 0; color: var(--ink-2); }

.faq { display: grid; }
.faq details { border-top: 1px solid var(--rule); }
.faq details:last-of-type { border-bottom: 1px solid var(--rule); }
.faq summary {
  cursor: pointer; padding: 20px 0; font-size: 17px; font-weight: 600;
  font-family: var(--f-display); letter-spacing: -.015em;
  list-style: none; display: flex; justify-content: space-between; gap: 20px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--signal); font-family: var(--f-mono); font-size: 18px; line-height: 1.2; }
.faq details[open] summary::after { content: "\2212"; }
.faq details p { margin: -4px 0 22px; color: var(--ink-2); max-width: 44em; }

/* ---------- diagramma ---------- */
.diagram { margin: 0; }
.diagram .scroll { overflow-x: auto; padding-bottom: 6px; }
.diagram svg { width: 100%; min-width: 660px; height: auto; display: block; }
.diagram figcaption { margin-top: 22px; color: var(--graphite); font-size: 14.5px; max-width: 46em; line-height: 1.55; }

.d-perimeter rect { fill: none; stroke: var(--signal); stroke-width: 1.5; stroke-dasharray: 7 5; }
.d-perimeter text { fill: var(--signal); font: 500 11px var(--f-mono); letter-spacing: .14em; text-transform: uppercase; }
.d-lane rect { fill: var(--panel); stroke: var(--rule-2); stroke-width: 1.2; }
.d-lane .d-name  { fill: var(--ink); font: 600 13.5px var(--f-display); text-anchor: middle; }
.d-lane .d-store { fill: var(--graphite); font: 400 11px var(--f-mono); text-anchor: middle; }
.d-link { stroke: var(--signal); stroke-width: 1.6; fill: none; }
.d-label { fill: var(--graphite); font: 400 10.5px var(--f-mono); letter-spacing: .08em; text-anchor: middle; text-transform: uppercase; }
.d-cross { stroke: var(--rule-2); stroke-width: 1.3; fill: none; stroke-dasharray: 4 4; }
.d-x { stroke: var(--cut); stroke-width: 1.9; fill: none; stroke-linecap: round; }
.d-mask { fill: var(--paper-2); }
.d-out text { fill: var(--graphite); font: 400 11.5px var(--f-mono); }
.d-chassis rect { fill: var(--signal-sf); stroke: var(--signal); stroke-width: 1.2; stroke-dasharray: 3 3; }
.d-chassis text { fill: var(--signal); font: 500 10.5px var(--f-mono); letter-spacing: .16em; text-transform: uppercase; text-anchor: middle; }

/* ---------- chat ---------- */
.chat { background: var(--panel); border: 1px solid var(--rule-2); max-width: 820px; }
.chat-log { min-height: 230px; max-height: 470px; overflow-y: auto; padding: 24px; display: flex; flex-direction: column; gap: 16px; }
.msg { display: flex; }
.msg .bubble {
  max-width: 84%; padding: 12px 16px; border-radius: var(--r);
  font-size: 16px; line-height: 1.55; white-space: pre-wrap; overflow-wrap: anywhere;
}
.msg.agent .bubble { background: var(--paper-2); border: 1px solid var(--rule); color: var(--ink); }
.msg.user { justify-content: flex-end; }
.msg.user .bubble { background: var(--signal); color: var(--paper); }
.msg.typing .bubble { color: var(--graphite); font-family: var(--f-mono); font-size: 13px; }

.chat-status { padding: 14px 24px; border-top: 1px solid var(--rule); background: var(--signal-sf); color: var(--ink-2); font-size: 15px; }
.chat-status.error { background: color-mix(in srgb, var(--cut) 10%, transparent); color: var(--cut); }

.chat-form { display: flex; gap: 12px; padding: 16px; border-top: 1px solid var(--rule); align-items: flex-end; }
.chat-form textarea {
  flex: 1; resize: none; min-height: 46px; max-height: 170px;
  padding: 12px 14px; border-radius: var(--r);
  border: 1px solid var(--rule-2); background: var(--paper); color: var(--ink);
  font-family: var(--f-body); font-size: 16px; outline: none;
}
.chat-form textarea:focus { border-color: var(--signal); box-shadow: 0 0 0 3px var(--signal-sf); }
.chat-privacy { margin: 0; padding: 0 24px 20px; color: var(--graphite); font-size: 13px; }

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--rule); padding-block: 40px; }
.foot-in { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; align-items: flex-start; }
.foot strong { font-family: var(--f-display); font-size: 16.5px; }
.foot p { margin: 8px 0 0; color: var(--ink-2); font-size: 15px; }

/* ============================================================
   Movimento. La pagina a riposo e' gia' leggibile: lo stato
   nascosto esiste solo dove JS puo' effettivamente rimuoverlo.
   ============================================================ */
@media (scripting: enabled) {
  [data-reveal] {
    opacity: 0; transform: translateY(14px);
    transition: opacity .6s cubic-bezier(.2,.7,.3,1), transform .6s cubic-bezier(.2,.7,.3,1);
  }
  [data-reveal].in { opacity: 1; transform: none; }
}

.plan .cell[data-tilt] { transition: background .25s, opacity .6s cubic-bezier(.2,.7,.3,1), transform .6s cubic-bezier(.2,.7,.3,1); }
.plan .cell[data-tilt]::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(260px circle at var(--mx,50%) var(--my,50%), var(--signal-sf), transparent 62%);
  opacity: 0; transition: opacity .28s; pointer-events: none;
}
.plan .cell[data-tilt]:hover::after { opacity: 1; }

.d-pulse { fill: var(--signal); opacity: 0; }
.diagram.in .d-pulse { animation: dPulse 3.2s ease-in-out infinite; }
.diagram.in .d-pulse:nth-of-type(2) { animation-delay: 1.05s; }
.diagram.in .d-pulse:nth-of-type(3) { animation-delay: 2.1s; }
@keyframes dPulse { 0%,100% { opacity: 0; } 18%,72% { opacity: 1; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .hero-field { opacity: 1; }
  .d-pulse { display: none; }
}

/* sottotitoli interni di sezione: etichette, non titoli */
.section > .mono { margin: 50px 0 18px; color: var(--signal); }
.section > .mono:first-of-type { margin-top: 0; }
.sec-lead.narrow { margin: -6px 0 22px; }

/* ============================================================
   L'agente. Quattro pose, uno stato per volta:
   saluto -> in ascolto -> sta pensando -> risponde -> in ascolto.
   Lo stato e' scritto anche a parole sotto il palco: l'animazione
   non e' l'unico modo per capire che sta lavorando.
   ============================================================ */

.agent-bay { display: grid; gap: 22px; grid-template-columns: 1fr; align-items: start; }
@media (min-width: 920px) { .agent-bay { grid-template-columns: 300px minmax(0, 1fr); } }
.agent-bay .chat { max-width: none; }

.agent-stage {
  position: relative; margin: 0; overflow: hidden;
  border: 1px solid var(--rule-2); background: var(--paper-2);
  padding: 16px 16px 0;
}
.agent-stage::before, .agent-stage::after {
  content: ""; position: absolute; width: 12px; height: 12px;
  border: 2px solid var(--signal); pointer-events: none; z-index: 3;
}
.agent-stage::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.agent-stage::after  { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

.agent-frames { position: relative; aspect-ratio: 1 / 1; z-index: 1; transition: transform .5s cubic-bezier(.2,.7,.3,1); }
.agent-float  { position: absolute; inset: 0; animation: agentFloat 7s ease-in-out infinite; }

.agent-frame {
  position: absolute; inset: 0; opacity: 0;
  transform: scale(.965);
  transition: opacity .42s ease, transform .52s cubic-bezier(.2,.7,.3,1);
}
.agent-frame img { width: 100%; height: 100%; object-fit: contain; display: block; }

.agent-stage[data-state="saluto"]   .agent-frame[data-state="saluto"],
.agent-stage[data-state="ascolto"]  .agent-frame[data-state="ascolto"],
.agent-stage[data-state="pensa"]    .agent-frame[data-state="pensa"],
.agent-stage[data-state="risponde"] .agent-frame[data-state="risponde"] {
  opacity: 1; transform: none;
}

/* alone dietro l'agente: pulsa solo mentre pensa */
.agent-ring {
  position: absolute; left: 50%; top: 46%; width: 62%; aspect-ratio: 1;
  transform: translate(-50%, -50%) scale(.7);
  border: 1px solid var(--signal); border-radius: 50%;
  opacity: 0; z-index: 0; pointer-events: none;
}
.agent-stage[data-state="pensa"] .agent-ring { animation: agentRing 2.6s ease-out infinite; }

/* riga di scansione: attraversa il palco mentre elabora */
.agent-scan {
  position: absolute; left: 0; right: 0; height: 24%; top: -26%;
  /* tinta, non velo: var(--signal-sf) e' quasi opaco e slavava l'agente */
  background: linear-gradient(to bottom, transparent, rgba(29,91,214,.15), transparent);
  background: linear-gradient(to bottom, transparent,
              color-mix(in srgb, var(--signal) 15%, transparent), transparent);
  opacity: 0; z-index: 2; pointer-events: none;
}
.agent-stage[data-state="pensa"] .agent-scan { opacity: 1; animation: agentScan 2.3s linear infinite; }

.agent-status {
  position: relative; z-index: 3;
  display: flex; align-items: center; gap: 7px;
  padding: 12px 2px 14px; border-top: 1px solid var(--rule);
  margin-top: 4px;
}
.agent-status .mono { color: var(--signal); }
.agent-status .dots { display: none; gap: 4px; align-items: center; }
.agent-stage[data-state="pensa"] .agent-status .dots { display: inline-flex; }
.agent-status .dots b { width: 4px; height: 4px; border-radius: 50%; background: var(--signal); opacity: .25; }
.agent-stage[data-state="pensa"] .dots b { animation: agentDot 1.25s ease-in-out infinite; }
.agent-stage[data-state="pensa"] .dots b:nth-child(2) { animation-delay: .18s; }
.agent-stage[data-state="pensa"] .dots b:nth-child(3) { animation-delay: .36s; }

/* errore: cambia solo il tono dell'etichetta, la posa resta valida */
.agent-stage[data-alert] .agent-status .mono { color: var(--cut); }

@keyframes agentFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-7px); } }
@keyframes agentScan  { from { top: -26%; } to { top: 102%; } }
@keyframes agentRing {
  0%   { opacity: 0;   transform: translate(-50%, -50%) scale(.68); }
  35%  { opacity: .55; }
  100% { opacity: 0;   transform: translate(-50%, -50%) scale(1.08); }
}
@keyframes agentDot { 0%, 100% { opacity: .22; } 45% { opacity: 1; } }

@media (prefers-reduced-motion: reduce) {
  .agent-float { animation: none; }
  .agent-scan, .agent-ring { display: none; }
  .agent-frames { transition: none; }
  .agent-status .dots b { opacity: .6; }
}


/* ---------- la gemma: la testa dell'agente, dentro il perimetro ---------- */
.frame-side { display: grid; gap: 4px; }
.gem {
  display: block; width: 100%; aspect-ratio: 1 / 1;
  max-height: 300px; margin: -16px auto 0;
  opacity: 0; transition: opacity 1.2s ease;
  touch-action: pan-y;
}
.gem.on { opacity: 1; }
@media (max-width: 999px) { .gem { max-width: 240px; } }

/* ============================================================
   Interazione
   ============================================================ */

/* mirino: vive fuori dalla cornice, che lo copre. E' il punto:
   scandaglia il mondo esterno e si ferma al perimetro. */
.crosshair { position: absolute; inset: 0; z-index: 0; pointer-events: none; opacity: 0; transition: opacity .35s ease; }
.crosshair.on { opacity: 1; }
.crosshair .ch-v, .crosshair .ch-h { position: absolute; background: var(--signal); opacity: .28; will-change: transform; }
.crosshair .ch-v { top: 0; bottom: 0; left: 0; width: 1px; }
.crosshair .ch-h { left: 0; right: 0; top: 0; height: 1px; }
.crosshair .ch-read {
  /* ancorata all'angolo, non al puntatore: sopra la cornice verrebbe tagliata */
  position: absolute; left: 14px; bottom: 12px;
  color: var(--signal); opacity: .7; font-size: 10.5px; white-space: nowrap;
}

/* pulsanti magnetici */
.btn, .theme-btn, .chip { will-change: transform; }
.btn.magnet, .theme-btn.magnet, .chip.magnet { transition: transform .12s ease-out; }
.btn:not(.magnet), .theme-btn:not(.magnet), .chip:not(.magnet) { transition: transform .45s cubic-bezier(.2,.8,.3,1), border-color .16s, background .16s, color .16s; }

/* avanzamento della lettura */
.nav-progress {
  position: absolute; left: 0; right: 0; bottom: -1px; height: 2px;
  background: var(--signal); transform: scaleX(0); transform-origin: 0 50%;
  will-change: transform;
}

/* inclinazione 3D delle celle */
.plan { perspective: 1200px; }
.plan .cell[data-tilt] {
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform .5s cubic-bezier(.2,.7,.3,1), background .25s,
              opacity .6s cubic-bezier(.2,.7,.3,1);
}
.plan .cell[data-tilt]:hover { z-index: 2; }

/* l'agente si inclina, non trasla soltanto */
.agent-stage { perspective: 820px; }
.agent-frames { transform-style: preserve-3d; }

@media (prefers-reduced-motion: reduce) {
  .crosshair { display: none; }
  .nav-progress { display: none; }
}