/* css/base.css — reset + tipografia sistema "AI Lab" (sans/mono, non più allineata al palette admin) */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* Scala tipografica (mappa doc-base.css) */
.t-display { font-family: var(--font-display); font-size: 48px; font-weight: 800; line-height: 1.05; letter-spacing: -0.022em; }
.t-h1 { font-family: var(--font-display); font-size: 32px; font-weight: 700; line-height: 1.1; letter-spacing: -0.014em; }
.t-h2 { font-family: var(--font-display); font-size: 24px; font-weight: 700; line-height: 1.15; letter-spacing: -0.01em; }
.t-h3 { font-family: var(--font-sans);  font-size: 16px; font-weight: 700; }
.t-body { font-family: var(--font-sans); font-size: 16px; }
.t-ui { font-family: var(--font-sans); font-size: 14px; font-weight: 500; }
.t-meta { font-family: var(--font-sans); font-size: 12px; font-weight: 500; color: var(--ink-muted); }
.t-label { font-family: var(--font-sans); font-size: 10px; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; color: var(--ink-faint); }
.t-mono { font-family: var(--font-mono); font-size: 14px; }

/* Helper */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--s5); }
.accent { color: var(--accent); }

/* Bottoni base */
.btn { display: inline-flex; align-items: center; gap: var(--s2); padding: var(--s3) var(--s5);
  border-radius: var(--r1); font-family: var(--font-sans); font-weight: 600; font-size: 14px;
  border: 1px solid var(--rule); cursor: pointer; transition: transform .2s ease, filter .2s ease, border-color .2s ease, box-shadow .2s ease; }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn-primary:hover { filter: brightness(1.08); transform: translateY(-1px); box-shadow: 0 4px 16px color-mix(in srgb, var(--accent) 35%, transparent); }
.btn-outline { background: transparent; color: var(--ink); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); box-shadow: 0 4px 14px color-mix(in srgb, var(--accent) 15%, transparent); }


/* ==========================================================================
   Nav — "instrument bar" tecnico e compatto (Task 3, condiviso .it/.tech)
   ========================================================================== */
.lab-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface-glass);
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  border-bottom: 1px solid var(--rule);
  /* Riga tecnica sottile: sfuma sotto il rule per un effetto "misura" */
  box-shadow: 0 1px 0 var(--grid-line);
}
.lab-nav .nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s5);
  height: 64px; /* compatto: la barra non deve dominare il primo viewport */
}

/* Brand: logo + nome + etichetta mono di modalità, impilati e discreti */
.lab-nav .nav-brand {
  display: flex;
  align-items: center;
  gap: var(--s3);
  min-width: 0;
}
.lab-nav .nav-logo { width: 32px; height: 32px; object-fit: contain; flex-shrink: 0; }
.lab-nav .brand-stack { display: flex; flex-direction: column; gap: 2px; line-height: 1; min-width: 0; }
.lab-nav .brand-name {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}
.lab-nav .brand-mode {
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--ink-faint);
  white-space: nowrap;
}

/* Link di navigazione: etichette tecniche con marcatore ad angolo sull'hover/attivo */
.lab-nav .nav-menu {
  display: flex;
  align-items: center;
  gap: var(--s6);
}
.lab-nav .nav-link {
  position: relative;
  color: var(--ink-soft);
  padding: var(--s2) 0;
  transition: color .15s ease;
}
.lab-nav .nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -1px;
  height: 1px;
  background: var(--accent);
  transition: right .2s ease;
}
.lab-nav .nav-link:hover { color: var(--ink); }
.lab-nav .nav-link:hover::after { right: 0; }
.lab-nav .nav-link.accent { color: var(--accent); }
.lab-nav .nav-link.accent:hover { filter: brightness(1.1); }

/* Status chip: piccolo indicatore "sistema attivo" con dot pulsante */
.lab-nav .nav-status {
  display: inline-flex;
  align-items: center;
  gap: var(--s2);
  margin-left: var(--s3);
  padding: var(--s1) var(--s3);
  border: 1px solid var(--rule);
  border-radius: var(--r3);
  background: var(--surface-panel);
}
.lab-nav .nav-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 25%, transparent);
  animation: nav-status-pulse 2.4s ease-in-out infinite;
}
.lab-nav .nav-status-label { font-size: 10px; letter-spacing: .04em; color: var(--ink-muted); white-space: nowrap; }
@keyframes nav-status-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .45; }
}

/* Hamburger: 3 barre animate in X quando .nav-toggle riceve .active (via main.js) */
.lab-nav .nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
}
.lab-nav .nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--ink);
  border-radius: var(--r1);
  transition: transform .2s ease, opacity .2s ease;
}
.lab-nav .nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.lab-nav .nav-toggle.active span:nth-child(2) { opacity: 0; }
.lab-nav .nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile: il menu resta nascosto finché JS non aggiunge .active a #nav-menu */
@media (max-width: 860px) {
  .lab-nav .nav-toggle { display: flex; }
  .lab-nav .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: var(--s4) var(--s5) var(--s6);
    background: var(--surface-panel);
    border-bottom: 1px solid var(--rule);
    /* Nascosto di default: rivelato SOLO da .active (aggiunta/rimossa da js/main.js) */
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    /* «visibility» non e' un doppione dell'opacita', ed e' stata aggiunta il 07/09/2026
       perche' mancava. «max-height:0» NON comprime il padding quando box-sizing e'
       border-box: da chiuso restava una striscia alta quanto i due padding — 49px,
       misurati — invisibile per via dell'opacita' ma ancora nel layout. E «opacity:0»
       non toglie un elemento agli eventi di puntatore: quella striscia riceveva i clic
       al posto della pagina sotto la barra, e restava raggiungibile col tasto di
       tabulazione. Presidiata da scripts/sonda-menu.js, che l'ha trovata. */
    visibility: hidden;
    /* La transizione include «visibility» perche' altrimenti scatterebbe subito,
       facendo sparire il pannello prima che la dissolvenza sia finita. */
    transition: max-height .25s ease, opacity .2s ease, visibility .25s ease;
  }
  .lab-nav .nav-menu.active {
    max-height: 80vh;
    opacity: 1;
    visibility: visible;
    overflow-y: auto;
  }
  .lab-nav .nav-link { width: 100%; padding: var(--s3) 0; border-bottom: 1px solid var(--rule); }
  .lab-nav .nav-link::after { display: none; }
  .lab-nav .nav-link:last-of-type { border-bottom: none; }
  .lab-nav .nav-status { margin: var(--s4) 0 0; }
  .lab-nav .brand-mode { display: none; } /* riduce ulteriormente l'ingombro del brand su mobile */
}

/* ==========================================================================
   Accessibilità — prefers-reduced-motion (Task 9 responsive pass)
   Globale: azzera durata/iterazioni delle animazioni (status dot, hover, ecc.)
   e disattiva lo scroll animato per chi richiede meno movimento a sistema.
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   Design elevation pass (Opus) — rifiniture di resa nella direzione "AI Lab"
   già approvata. Additivo: nessun cambio di font, palette o layout.
   ========================================================================== */
/* Bottoni: micro-interazioni "da strumento" — glow d'accento, pressione, focus visibile */
.btn { letter-spacing: .01em; }
.btn-primary:hover { box-shadow: 0 8px 24px -10px color-mix(in srgb, var(--accent) 70%, transparent); }
.btn-outline:hover { box-shadow: 0 8px 24px -14px rgba(0, 0, 0, .6); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: none; box-shadow: var(--ring); }

/* Ingresso scaglionato: rivelazione ordinata al caricamento pagina.
   Sotto prefers-reduced-motion il blocco sopra azzera la durata -> compare istantaneo. */
@keyframes lab-rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: none; }
}

/* ==========================================================================
   Footer — "lab" sottile e strutturato (condiviso .it/.tech).
   Multi-colonna, logo compatto, barra inferiore con stato/copyright/build.
   Accento = solo hover/crosslink, coerente col resto del sistema.
   ========================================================================== */
.lab-footer {
  border-top: 1px solid var(--rule);
  background: var(--surface-alt);
}
.lab-footer .footer-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1fr;
  gap: var(--s6);
  padding: var(--s7) var(--s5) var(--s6);
}
/* Colonna brand */
.lab-footer .footer-brand { display: flex; flex-direction: column; gap: var(--s3); }
.lab-footer .footer-brand-link { display: inline-flex; align-items: center; width: fit-content; }
.lab-footer .footer-brand-stack { display: flex; flex-direction: column; gap: 1px; line-height: 1.1; }
.lab-footer .footer-brand-name { font-size: 15px; font-weight: 700; color: var(--ink); }
.lab-footer .footer-brand-mode { font-size: 10px; letter-spacing: .06em; color: var(--ink-faint); }
.lab-footer .footer-tagline { margin: 0; max-width: 32ch; }
/* Colonne link */
.lab-footer .footer-col { display: flex; flex-direction: column; gap: var(--s3); }
.lab-footer .footer-col-title { color: var(--ink-faint); }
.lab-footer .footer-link { font-size: 14px; color: var(--ink-soft); width: fit-content; transition: color .15s ease; }
.lab-footer .footer-link:hover { color: var(--accent); }
.lab-footer .footer-link--accent { color: var(--accent); }
.lab-footer .footer-meta { color: var(--ink-muted); font-size: 12px; }
/* Barra inferiore: riga tecnica sottile */
.lab-footer .footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s4);
  flex-wrap: wrap;
  padding: var(--s4) var(--s5);
  border-top: 1px solid var(--rule);
}
.lab-footer .footer-status { display: inline-flex; align-items: center; gap: var(--s2); font-size: 12px; color: var(--ink-muted); }
.lab-footer .footer-status-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 25%, transparent);
}
.lab-footer .footer-copy { color: var(--ink-muted); }
.lab-footer .footer-build { color: var(--ink-faint); font-size: 12px; }

@media (max-width: 760px) {
  .lab-footer .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--s5); }
  .lab-footer .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 460px) {
  .lab-footer .footer-grid { grid-template-columns: 1fr; }
  .lab-footer .footer-bottom { justify-content: flex-start; }
}

/* Rimando all'informativa nella barra inferiore: vive dentro il blocco del copyright,
   quindi eredita la sua dimensione e si distingue solo per il colore al passaggio. */
.lab-footer .footer-legal { color: var(--ink-soft); margin-left: var(--s2); transition: color .15s ease; }
.lab-footer .footer-legal:hover { color: var(--accent); }