:root {
  --rosso: #ed1c24;
  --rosso-cupo: #b8141b;
  --sfondo: #f5f5f7;
  --carta: #ffffff;
  --testo: #1c1c24;
  --testo-2: #5c5c68;
  --bordo: #d6d6de;
  --bolla-utente: #27272f;
  --bolla-utente-testo: #ffffff;
  --codice-sfondo: #1c1c24;
  --codice-testo: #e8f5e9;
  --codice-barra: #27272f;
  --ombra: 0 1px 3px rgba(0,0,0,.08), 0 6px 20px rgba(0,0,0,.06);
  --raggio: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --sfondo: #0b0b0d;
    --carta: #17171d;
    --testo: #f1f1f4;
    --testo-2: #8e8e99;
    --bordo: #30303a;
    --bolla-utente: #3d3d49;
    --codice-sfondo: #0b0b0d;
    --codice-barra: #1c1c24;
    --ombra: 0 1px 3px rgba(0,0,0,.4);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --sfondo: #0b0b0d; --carta: #17171d; --testo: #f1f1f4; --testo-2: #8e8e99;
  --bordo: #30303a; --bolla-utente: #3d3d49; --codice-sfondo: #0b0b0d; --codice-barra: #1c1c24;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--sfondo);
  color: var(--testo);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}
button {
  font: inherit; cursor: pointer; border: 0; border-radius: 10px;
  background: var(--rosso); color: #fff; padding: 8px 14px; font-weight: 600;
}
button:hover { background: var(--rosso-cupo); }
button.ghost { background: transparent; color: var(--testo-2); font-weight: 500; }
button.ghost:hover { background: rgba(128,128,140,.12); color: var(--testo); }
button:disabled { opacity: .5; cursor: default; }
code, pre, textarea#scheda-testo { font-family: "SF Mono", Menlo, Consolas, "Liberation Mono", monospace; }

.barra {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 16px; background: var(--carta); border-bottom: 1px solid var(--bordo);
}
.marchio { display: flex; align-items: center; gap: 10px; }
.marchio small { display: block; color: var(--testo-2); font-size: 12px; line-height: 1.2; }
.marchio strong { line-height: 1.2; }
.logo {
  display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 9px;
  background: var(--rosso); color: #fff; font-weight: 800; font-style: italic; font-size: 17px;
}
.logo.grande { width: 56px; height: 56px; font-size: 26px; border-radius: 14px; }
.azioni { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; justify-content: flex-end; }
.stato { font-size: 12px; color: var(--testo-2); padding: 3px 8px; border: 1px solid var(--bordo); border-radius: 999px; }
.stato.prova { color: #9a6700; border-color: #e3b341; }

.contenuto { flex: 1; display: flex; width: 100%; max-width: 1200px; margin: 0 auto; }
.chat { flex: 1; padding: 20px 16px 8px; display: flex; flex-direction: column; gap: 14px; min-width: 0; }

.benvenuto { margin: auto 0; padding: 8px 4px 24px; }
.benvenuto h1 { font-size: 26px; margin: 0 0 6px; }
.benvenuto p { color: var(--testo-2); max-width: 60ch; }
.esempi { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 10px; margin-top: 16px; }
.esempio {
  text-align: left; background: var(--carta); color: var(--testo); border: 1px solid var(--bordo);
  padding: 12px 14px; border-radius: 12px; font-weight: 500;
}
.esempio:hover { border-color: var(--rosso); background: var(--carta); }

.msg { display: flex; gap: 10px; max-width: 100%; }
.msg .avatar { flex: 0 0 32px; width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; font-size: 15px; }
.msg.bot .avatar { background: var(--rosso); color: #fff; font-weight: 800; font-style: italic; }
.msg.utente { flex-direction: row-reverse; }
.msg.utente .avatar { background: var(--bolla-utente); color: #fff; }
.bolla {
  min-width: 0;
  max-width: min(760px, 100%); padding: 10px 14px; border-radius: var(--raggio);
  background: var(--carta); box-shadow: var(--ombra); overflow-wrap: anywhere;
}
.msg.utente .bolla { background: var(--bolla-utente); color: var(--bolla-utente-testo); white-space: pre-wrap; }
.bolla > :first-child { margin-top: 0; }
.bolla > :last-child { margin-bottom: 0; }
.bolla p { margin: 8px 0; }
.bolla ul, .bolla ol { padding-left: 22px; }
.bolla code:not(pre code) {
  background: rgba(237,28,36,.08); color: var(--rosso-cupo); padding: 1px 6px; border-radius: 6px; cursor: copy;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .bolla code:not(pre code) { color: #ff6b70; } }
.bolla table { border-collapse: collapse; margin: 8px 0; font-size: 14px; }
.bolla th, .bolla td { border: 1px solid var(--bordo); padding: 4px 8px; }

.formula { margin: 10px 0; border-radius: 12px; overflow: hidden; background: var(--codice-sfondo); box-shadow: var(--ombra); }
.formula-barra {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 6px 8px 6px 12px; background: var(--codice-barra); color: #b9b9c6; font-size: 12px; letter-spacing: .02em;
}
.formula-barra button { padding: 5px 12px; font-size: 13px; border-radius: 8px; }
.formula-barra button.copiato { background: #1f9d55; }
.formula pre { margin: 0; padding: 12px 14px; overflow-x: auto; color: var(--codice-testo); font-size: 14.5px; line-height: 1.45; }
.formula pre code { white-space: pre; }

.cursore::after { content: "▍"; animation: lampeggia 1s steps(2) infinite; color: var(--rosso); }
@keyframes lampeggia { 50% { opacity: 0; } }

.composer {
  position: sticky; bottom: 0; display: flex; gap: 8px; align-items: flex-end;
  width: 100%; max-width: 1200px; margin: 0 auto; padding: 10px 16px calc(12px + env(safe-area-inset-bottom));
  background: linear-gradient(to top, var(--sfondo) 70%, transparent);
}
.composer textarea {
  flex: 1; resize: none; max-height: 40vh; padding: 12px 14px; border-radius: 14px;
  border: 1px solid var(--bordo); background: var(--carta); color: var(--testo); font: inherit; line-height: 1.4;
}
.composer textarea:focus { outline: 2px solid var(--rosso); outline-offset: -1px; }
.composer button { width: 46px; height: 46px; border-radius: 14px; font-size: 18px; padding: 0; }

.pannello {
  width: min(420px, 100%); border-left: 1px solid var(--bordo); background: var(--carta);
  display: flex; flex-direction: column; padding: 12px 14px; gap: 10px; position: sticky; top: 57px; height: calc(100dvh - 57px);
}
.pannello-testa { display: flex; justify-content: space-between; align-items: center; }
.pannello textarea { flex: 1; resize: none; border: 1px solid var(--bordo); border-radius: 10px; padding: 10px; font-size: 13px; background: var(--sfondo); color: var(--testo); }
.pannello-azioni { display: flex; gap: 6px; align-items: center; justify-content: flex-end; flex-wrap: wrap; }
.pannello-azioni .nota { margin-right: auto; }
.nota { font-size: 12px; color: var(--testo-2); margin: 0; }
.nota code { background: rgba(128,128,140,.15); padding: 0 4px; border-radius: 4px; }

.velo { position: fixed; inset: 0; z-index: 20; background: var(--sfondo); display: grid; place-items: center; padding: 16px; }
.scheda-login {
  width: min(380px, 100%); background: var(--carta); border: 1px solid var(--bordo); border-radius: 18px;
  padding: 28px 24px; box-shadow: var(--ombra); display: flex; flex-direction: column; gap: 10px; align-items: center; text-align: center;
}
.scheda-login h2 { margin: 6px 0 0; }
.scheda-login p { margin: 0; color: var(--testo-2); }
.scheda-login input { width: 100%; padding: 11px 12px; border-radius: 10px; border: 1px solid var(--bordo); background: var(--sfondo); color: var(--testo); font: inherit; }
.scheda-login button { width: 100%; padding: 11px; }
.errore { color: var(--rosso); font-size: 13px; min-height: 1.2em; }

@media (max-width: 820px) {
  .contenuto { flex-direction: column; }
  .pannello { position: fixed; inset: 57px 0 0 0; width: 100%; height: auto; border-left: 0; z-index: 8; }
  .azioni button.ghost { padding: 8px 9px; }
  .benvenuto h1 { font-size: 22px; }
}

/* Telefono: bolle che non sbordano e barra compatta */
.msg .bolla { flex: 0 1 auto; }
@media (max-width: 600px) {
  .barra { padding: 8px 10px; }
  .marchio small { display: none; }
  .stato { display: none; }
  .azioni button.ghost { padding: 6px 7px; font-size: 13px; }
  .chat { padding: 14px 10px 8px; }
  .msg .bolla { max-width: calc(100vw - 72px); }
  .composer { padding: 8px 10px calc(10px + env(safe-area-inset-bottom)); }
}