/* ============================================================================
   VOLTA — foglio di stile comune alle pagine interne.
   Scuro sempre: queste schermate si usano di notte, in un locale buio.
   ========================================================================= */
:root{
  --ground:#0A0A0B;
  --surface:#141518;
  --surface-2:#191B1F;
  --line:#26282E;
  --line-soft:#1D1F24;
  --text:#F2F2F0;
  --muted:#8A8F98;
  --accent:#4F7CFF;
  --ok:#2ECC71;
  --danger:#E5484D;
  color-scheme:dark;
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{margin:0;padding:0;}
body{
  background:var(--ground);
  color:var(--text);
  font-family:Inter,system-ui,-apple-system,"Helvetica Neue",sans-serif;
  font-size:16px;line-height:1.55;
  -webkit-font-smoothing:antialiased;
  min-height:100dvh;
}

/* marchio: quando arriva il PNG si sostituisce qui, stesso ingombro */
.mark{
  height:18px;line-height:18px;padding:9px 0;
  font-size:13px;font-weight:600;
  letter-spacing:.42em;text-indent:.42em;
  color:var(--text);
}

.label{
  font-size:10px;font-weight:600;
  letter-spacing:.18em;text-transform:uppercase;
  color:var(--muted);
}

/* --- campi ---------------------------------------------------------------- */
.field{display:flex;flex-direction:column;gap:7px;}
.field label{font-size:10px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);}
/* Elencare i tipi uno per uno è una trappola: quello dimenticato prende
   l'aspetto di default del browser e stona. Si parte da tutti gli input e si
   escludono solo quelli che devono restare nativi (spunte e interruttori). */
input:not([type=checkbox]):not([type=radio]):not([type=range]):not([type=file]),
select,
textarea{
  height:52px;width:100%;
  background:var(--surface);border:1px solid var(--line);
  color:var(--text);font-family:inherit;font-size:16px;  /* 16px: iOS non zooma */
  padding:0 15px;border-radius:0;
  transition:border-color .12s;
}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);}
input::placeholder{color:#4A4E57;}

/* --- pulsanti -------------------------------------------------------------- */
.btn{
  height:56px;width:100%;
  display:flex;align-items:center;justify-content:center;gap:10px;
  border:1px solid var(--line);background:var(--surface);
  color:var(--text);font-family:inherit;font-size:16px;font-weight:600;
  border-radius:0;cursor:pointer;text-decoration:none;
}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px;}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;}
.btn.primary:disabled{background:#23262E;border-color:#23262E;color:var(--muted);cursor:default;}
.btn.ghost{background:none;}
.btn.small{height:48px;font-size:14px;}

/* --- messaggi -------------------------------------------------------------- */
.error{border-left:2px solid var(--danger);background:rgba(229,72,77,.08);padding:12px 15px;font-size:14.5px;}
.good{border-left:2px solid var(--ok);background:rgba(46,204,113,.07);padding:12px 15px;font-size:14.5px;}

footer.presented{
  display:flex;align-items:center;gap:10px;
  font-size:9.5px;font-weight:600;letter-spacing:.3em;text-indent:.3em;color:var(--muted);
}

[hidden]{display:none!important;}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;}}