/* ===========================================================================
   MEconf — foglio di stile unico.

   Nessuna dipendenza esterna: la CSP non ammette altri host, quindi niente
   CDN, niente font remoti, niente framework.

   TEMA CHIARO DI DEFAULT, scuro con interruttore.

   La preferenza di sistema NON viene seguita: e' una scelta, non una
   dimenticanza. Un sito che cambia aspetto in base a un'impostazione che
   l'utente non ricorda di aver messo e' piu' confuso che accomodante. Qui si
   parte dal chiaro e si cambia con un bottone, che resta memorizzato.

     1. token      colore, spazio, raggi, ombre, tipografia, movimento
     2. reset
     3. primitive  bottoni, campi, card, badge, tabelle
     4. shell      intestazione e layout
     5. lobby
     6. stanza     griglia video e controlli
     7. admin
     8. captcha
     9. utilita'
    10. mobile
   =========================================================================== */

/* ---------------------------------------------------------------- 1. token */

:root {
  /* Superfici, dal fondo verso l'alto. Il fondo non e' bianco puro: un
     bianco pieno sotto card bianche toglie ogni senso di profondita'. */
  --bg: #f4f6fa;
  --bg-tint: #e9edf7;
  --surface: #ffffff;
  --surface-2: #f5f7fb;
  --surface-3: #eaeef6;

  --border: #e2e7f0;
  --border-strong: #cbd3e1;

  --text: #121826;
  --text-2: #4d5870;
  --text-3: #7c879e;

  --accent: #4f46e5;
  --accent-hi: #6366f1;
  --accent-ink: #ffffff;
  --accent-soft: #eef0fe;
  --accent-line: #c7cbfa;

  /* La cifratura end-to-end ha un colore proprio, distinto dall'azione:
     deve leggersi come uno stato, non come qualcosa da cliccare. */
  --secure: #7c3aed;
  --secure-soft: #f3eeff;

  --ok: #0d9488;
  --ok-soft: #e6f7f4;
  --warn: #c2700a;
  --warn-soft: #fdf3e3;
  --bad: #dc2626;
  --bad-soft: #fdecec;

  /* spazio: scala di 4 px */
  --s1: 0.25rem;
  --s2: 0.5rem;
  --s3: 0.75rem;
  --s4: 1rem;
  --s5: 1.5rem;
  --s6: 2rem;
  --s7: 3rem;
  --s8: 4rem;

  --r-sm: 9px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-full: 999px;

  /* Ombre a due livelli: un contorno stretto che definisce il bordo, piu'
     una diffusa che da' la distanza dal fondo. Una sola ombra larga rende
     tutto molle. */
  --shadow-1: 0 1px 2px rgb(18 24 38 / 0.06), 0 1px 1px rgb(18 24 38 / 0.04);
  --shadow-2: 0 1px 2px rgb(18 24 38 / 0.05), 0 8px 20px -6px rgb(18 24 38 / 0.1);
  --shadow-3: 0 2px 4px rgb(18 24 38 / 0.05), 0 24px 48px -16px rgb(18 24 38 / 0.18);

  --font: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --mono: ui-monospace, 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;

  --fast: 140ms cubic-bezier(0.2, 0, 0.2, 1);
  --slow: 280ms cubic-bezier(0.2, 0, 0.2, 1);

  color-scheme: light;
}

:root[data-theme='dark'] {
  --bg: #0c0f16;
  --bg-tint: #141b2a;
  --surface: #151a24;
  --surface-2: #1c2230;
  --surface-3: #252d3d;

  --border: #262e3e;
  --border-strong: #38425a;

  --text: #e9eef7;
  --text-2: #a4b0c6;
  --text-3: #6f7b93;

  --accent: #6366f1;
  --accent-hi: #8b93f8;
  --accent-ink: #ffffff;
  --accent-soft: #1d2142;
  --accent-line: #3b3f7a;

  --secure: #a78bfa;
  --secure-soft: #241d3d;

  --ok: #2dd4bf;
  --ok-soft: #10302e;
  --warn: #fbbf24;
  --warn-soft: #332611;
  --bad: #f87171;
  --bad-soft: #341a1a;

  --shadow-1: 0 1px 2px rgb(0 0 0 / 0.4);
  --shadow-2: 0 1px 2px rgb(0 0 0 / 0.3), 0 8px 20px -6px rgb(0 0 0 / 0.5);
  --shadow-3: 0 2px 4px rgb(0 0 0 / 0.3), 0 24px 48px -16px rgb(0 0 0 / 0.6);

  color-scheme: dark;
}

/* ---------------------------------------------------------------- 2. reset */

*,
*::before,
*::after {
  box-sizing: border-box;
}

/* L'attributo hidden deve vincere SEMPRE.
 *
 * Il browser lo applica con [hidden] { display: none }, che ha la
 * specificita' di un attributo: qualunque selettore di CLASSE che imposti
 * display lo sovrascrive. Qui succede ovunque, perche' .gate, .admin, .lobby
 * e .alert dichiarano display: il pannello amministratore restava visibile
 * sotto il modulo di accesso, e le schermate della stanza si sovrapponevano.
 *
 * E' una delle trappole piu' comuni dei CSS scritti a mano, e l'unica
 * soluzione pulita e' questa. */
[hidden] {
  display: none !important;
}

/* Un messaggio di errore vuoto non deve lasciare un riquadro colorato in
 * mezzo al modulo. Capita quando il codice lo mostra prima di avere un
 * testo da metterci. */
.alert:empty {
  display: none;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  /* Alone diffuso in alto: profondita' senza caricare un'immagine. */
  background-image: radial-gradient(110% 60% at 50% -8%, var(--bg-tint) 0%, transparent 60%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 640;
  letter-spacing: -0.021em;
  line-height: 1.22;
  color: var(--text);
}

h1 { font-size: 1.45rem; }
h2 { font-size: 1.06rem; }

p { margin: 0; }

code {
  font-family: var(--mono);
  font-size: 0.87em;
  padding: 0.12em 0.4em;
  border-radius: 5px;
  background: var(--surface-3);
  color: var(--text);
}

a { color: var(--accent); text-decoration: none; font-weight: 520; }
a:hover { text-decoration: underline; }

svg { display: block; flex: none; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ------------------------------------------------------------ 3. primitive */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s2);
  padding: 0.6rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 560;
  line-height: 1.2;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: var(--shadow-1);
  transition: background var(--fast), border-color var(--fast), transform var(--fast),
    box-shadow var(--fast), opacity var(--fast), color var(--fast);
}

.btn:hover:not(:disabled) {
  background: var(--surface-2);
  border-color: var(--text-3);
}
.btn:active:not(:disabled) { transform: translateY(1px); box-shadow: none; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; box-shadow: none; }
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  box-shadow: var(--shadow-1), inset 0 1px 0 rgb(255 255 255 / 0.18);
}
.btn-primary:hover:not(:disabled) {
  background: var(--accent-hi);
  border-color: var(--accent-hi);
  box-shadow: var(--shadow-2), 0 0 0 3px var(--accent-soft);
}

.btn-block { width: 100%; }

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-2);
  padding: 0.45rem 0.7rem;
  box-shadow: none;
}
.btn-ghost:hover:not(:disabled) {
  background: var(--surface-2);
  border-color: var(--border);
  color: var(--text);
}

.btn-danger { background: var(--bad); border-color: var(--bad); color: #fff; }
.btn-danger:hover:not(:disabled) {
  background: var(--bad);
  border-color: var(--bad);
  filter: brightness(1.08);
}

.btn-sm { padding: 0.32rem 0.62rem; font-size: 0.83rem; }
.btn-icon { width: 2.25rem; height: 2.25rem; padding: 0; }
.btn-row { display: flex; gap: var(--s2); flex-wrap: wrap; }

/* Lo spinner si aggiunge al testo invece di sostituirlo: cambiare il testo
   farebbe saltare la larghezza del bottone a meta' click. */
.btn[data-busy='true'] { pointer-events: none; opacity: 0.72; }
.btn[data-busy='true']::before {
  content: '';
  width: 0.9em;
  height: 0.9em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* --- campi --- */

.field { display: grid; gap: 0.4rem; }
.field + .field { margin-top: var(--s4); }

label,
.label {
  font-size: 0.78rem;
  font-weight: 620;
  letter-spacing: 0.03em;
  color: var(--text-2);
}

input[type='text'],
input[type='password'],
input[type='email'] {
  width: 100%;
  padding: 0.66rem 0.85rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  transition: border-color var(--fast), box-shadow var(--fast), background var(--fast);
}

input::placeholder { color: var(--text-3); }

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

input[readonly] { background: var(--surface-2); color: var(--text-2); }

.input-mono { font-family: var(--mono); letter-spacing: 0.07em; }

.input-row { display: flex; gap: var(--s2); align-items: stretch; }
.input-row input { flex: 1; min-width: 0; }

/* --- card --- */

.card {
  position: relative;
  padding: var(--s5);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--shadow-2);
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s4);
  margin-bottom: var(--s4);
  flex-wrap: wrap;
}

.card-ok   { border-color: color-mix(in srgb, var(--ok) 40%, var(--border)); }
.card-warn { border-color: color-mix(in srgb, var(--warn) 40%, var(--border)); }
.card-bad  { border-color: color-mix(in srgb, var(--bad) 40%, var(--border)); }

.lede { color: var(--text-2); }
.hint { color: var(--text-3); font-size: 0.85rem; margin-top: var(--s3); }
.hint-warn { color: var(--warn); }

.divider { height: 1px; background: var(--border); margin: var(--s5) 0; border: 0; }

/* --- messaggi --- */

.alert {
  display: flex;
  gap: var(--s3);
  margin-top: var(--s4);
  padding: 0.7rem 0.85rem;
  border-radius: var(--r-sm);
  font-size: 0.89rem;
  border: 1px solid transparent;
  animation: alert-in var(--fast) both;
}
.alert-bad  { background: var(--bad-soft);  border-color: color-mix(in srgb, var(--bad) 30%, transparent); }
.alert-warn { background: var(--warn-soft); border-color: color-mix(in srgb, var(--warn) 30%, transparent); }

@keyframes alert-in { from { opacity: 0; transform: translateY(-3px); } }

/* --- badge --- */

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  padding: 0.15rem 0.58rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-full);
  font-size: 0.74rem;
  font-weight: 580;
  color: var(--text-2);
  background: var(--surface-2);
  white-space: nowrap;
}
.pill-secure { border-color: var(--secure); color: var(--secure); background: var(--secure-soft); }
.pill-ok     { border-color: var(--ok);     color: var(--ok);     background: var(--ok-soft); }
.pill-warn   { border-color: var(--warn);   color: var(--warn);   background: var(--warn-soft); }

.pill-enforce { border-color: var(--ok);     color: var(--ok);     background: var(--ok-soft); }
.pill-monitor { border-color: var(--warn);   color: var(--warn);   background: var(--warn-soft); }
.pill-off     { border-color: var(--bad);    color: var(--bad);    background: var(--bad-soft); }
.pill-mesh    { border-color: var(--ok);     color: var(--ok);     background: var(--ok-soft); }
.pill-sfu     { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

.dot { width: 7px; height: 7px; flex: none; border-radius: 50%; background: var(--text-3); }
.dot[data-state='ok']  { background: var(--ok);  box-shadow: 0 0 0 3px var(--ok-soft); }
.dot[data-state='bad'] { background: var(--bad); box-shadow: 0 0 0 3px var(--bad-soft); }

/* --- tabelle --- */

/* Il contenuto largo scorre dentro il suo contenitore: il body non deve mai
   scorrere in orizzontale. */
.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface);
}

.table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }

.table th,
.table td {
  padding: 0.62rem 0.8rem;
  text-align: left;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}

.table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  font-size: 0.72rem;
  font-weight: 660;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-3);
  background: var(--surface-2);
}

.table tbody tr { transition: background var(--fast); }
.table tbody tr:hover { background: var(--surface-2); }
.table tbody tr:last-child td { border-bottom: 0; }

/* --- barra di robustezza --- */

.meter { display: grid; gap: 0.4rem; }
.meter-track { height: 6px; border-radius: var(--r-full); background: var(--surface-3); overflow: hidden; }
.meter-fill {
  display: block;
  height: 100%;
  width: 0;
  border-radius: var(--r-full);
  background: var(--bad);
  transition: width var(--slow), background-color var(--slow);
}
.meter[data-level='2'] .meter-fill { background: var(--warn); }
.meter[data-level='3'] .meter-fill { background: var(--accent); }
.meter[data-level='4'] .meter-fill { background: var(--ok); }
.meter-text { font-size: 0.8rem; color: var(--text-3); }

/* ---------------------------------------------------------------- 4. shell */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s4);
  padding: 0.7rem var(--s5);
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  backdrop-filter: saturate(1.6) blur(12px);
  flex-wrap: wrap;
}

.topbar-group { display: flex; align-items: center; gap: var(--s3); }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 680;
  font-size: 1.05rem;
  letter-spacing: -0.025em;
  color: var(--text);
}
.brand:hover { text-decoration: none; }

.brand-mark {
  display: grid;
  place-items: center;
  width: 1.9rem;
  height: 1.9rem;
  border-radius: 9px;
  background: var(--accent);
  color: var(--accent-ink);
}

.topbar-sep { width: 1px; height: 1.25rem; background: var(--border); }

.status { font-size: 0.85rem; color: var(--text-2); display: inline-flex; align-items: center; gap: var(--s2); }
.status[data-level='warn'] { color: var(--warn); }
.status[data-level='ok']   { color: var(--ok); }

/* --- schermate a tutta pagina --- */

.gate { flex: 1; display: grid; place-items: center; padding: var(--s7) var(--s4); }
.gate .card { width: 100%; max-width: 26rem; box-shadow: var(--shadow-3); }

.gate-icon {
  display: grid;
  place-items: center;
  width: 2.9rem;
  height: 2.9rem;
  margin-bottom: var(--s4);
  border-radius: var(--r-md);
  background: var(--accent-soft);
  color: var(--accent);
}
.gate-icon[data-tone='secure'] { background: var(--secure-soft); color: var(--secure); }
.gate-icon[data-tone='bad']    { background: var(--bad-soft);    color: var(--bad); }

/* ---------------------------------------------------------------- 5. lobby */

.lobby {
  flex: 1;
  width: 100%;
  max-width: 60rem;
  margin: 0 auto;
  padding: var(--s7) var(--s4) var(--s8);
  display: grid;
  gap: var(--s5);
  align-content: start;
}

.lobby-hero { text-align: center; margin-bottom: var(--s2); }
.lobby-hero h1 {
  font-size: clamp(1.75rem, 4.5vw, 2.5rem);
  margin-bottom: 0.6rem;
  letter-spacing: -0.03em;
}
.lobby-hero p { color: var(--text-2); max-width: 34rem; margin: 0 auto; font-size: 1.02rem; }

.lobby-grid {
  display: grid;
  gap: var(--s5);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 21rem), 1fr));
  align-items: start;
}

/* --- scelta della modalita' --- */

.modes { display: grid; gap: var(--s3); border: 0; padding: 0; margin: 0; }

.mode {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.2rem var(--s3);
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface-2);
  cursor: pointer;
  letter-spacing: normal;
  transition: border-color var(--fast), background var(--fast), box-shadow var(--fast);
}
.mode:hover { border-color: var(--border-strong); }
.mode:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 0 1px var(--accent-line);
}
.mode[data-mode='secure']:has(input:checked) {
  border-color: var(--secure);
  background: var(--secure-soft);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--secure) 35%, transparent);
}
.mode:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }

.mode input { grid-row: span 2; margin: 0.32rem 0 0; accent-color: var(--accent); }
.mode-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 640;
  font-size: 0.96rem;
  color: var(--text);
}
.mode-desc { color: var(--text-2); font-size: 0.86rem; }

.created-field { display: grid; gap: 0.4rem; }
.created-field + .created-field { margin-top: var(--s4); }

/* --------------------------------------------------------------- 6. stanza */

#stage { flex: 1; display: flex; flex-direction: column; min-height: 0; }

.grid {
  flex: 1;
  display: grid;
  gap: var(--s3);
  padding: var(--s4);
  grid-template-columns: repeat(var(--cols, 1), minmax(0, 1fr));
  align-content: center;
  min-height: 0;
}
.grid[data-columns='1'] { --cols: 1; }
.grid[data-columns='2'] { --cols: 2; }
.grid[data-columns='3'] { --cols: 3; }
.grid[data-columns='4'] { --cols: 4; }
.grid[data-columns='5'] { --cols: 5; }

.tile {
  position: relative;
  margin: 0;
  min-height: 0;
  aspect-ratio: 16 / 9;
  border-radius: var(--r-md);
  overflow: hidden;
  background: #0b0e14;
  box-shadow: var(--shadow-2);
  /* Un outline e non un border: comparendo non sposta il contenuto. */
  outline: 2px solid transparent;
  outline-offset: -2px;
  transition: outline-color var(--fast), transform var(--fast), box-shadow var(--fast);
  animation: tile-in var(--slow) both;
}

@keyframes tile-in { from { opacity: 0; transform: scale(0.97); } }

.tile video { width: 100%; height: 100%; object-fit: cover; display: block; }
.tile[data-local='true'] video { transform: scaleX(-1); }

.tile[data-speaking='true'] { outline-color: var(--ok); box-shadow: var(--shadow-3); }
.tile[data-connection='failed'],
.tile[data-connection='disconnected'] { outline-color: var(--bad); }

.tile[data-e2ee='mismatch'] { outline-color: var(--bad); }
.tile[data-e2ee='mismatch'] video { filter: grayscale(1) brightness(0.28); }

.tile figcaption {
  position: absolute;
  inset: auto 0 0 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s2);
  padding: var(--s5) 0.7rem 0.55rem;
  background: linear-gradient(transparent, rgb(0 0 0 / 0.8));
  color: #fff;
  font-size: 0.84rem;
}

.tile-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 560; }

.tile-badge {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  padding: 0.1rem 0.45rem;
  border: 1px solid currentColor;
  border-radius: var(--r-full);
  font-size: 0.71rem;
  font-weight: 580;
  background: rgb(0 0 0 / 0.4);
  white-space: nowrap;
}
.tile-badge[data-status='verified'] { color: #5eead4; }
.tile-badge[data-status='pending']  { color: #fcd34d; }
.tile-badge[data-status='mismatch'] { color: #fca5a5; }

/* --- controlli --- */

.controls { display: flex; justify-content: center; padding: var(--s3) var(--s4) var(--s5); }

.controls-pill {
  display: flex;
  align-items: center;
  gap: var(--s2);
  padding: 0.45rem;
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: saturate(1.6) blur(14px);
  box-shadow: var(--shadow-3);
}

.btn-round {
  width: 3rem;
  height: 3rem;
  padding: 0;
  border-radius: 50%;
  border-color: transparent;
  background: var(--surface-3);
  color: var(--text);
  box-shadow: none;
}
.btn-round:hover:not(:disabled) { background: var(--border-strong); border-color: transparent; }

/* Spento = rosso E icona barrata. La ridondanza e' voluta: il solo colore
   non basta a chi non lo distingue. */
.btn-round[data-off='true'] { background: var(--bad); color: #fff; }
.btn-round.btn-danger { background: var(--bad); color: #fff; }
.btn-round.btn-danger:hover:not(:disabled) { filter: brightness(1.1); }

/* ---------------------------------------------------------------- 7. admin */

.admin {
  flex: 1;
  width: 100%;
  max-width: 76rem;
  margin: 0 auto;
  padding: var(--s6) var(--s4) var(--s8);
  display: grid;
  gap: var(--s5);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));
  align-content: start;
}

.admin .card-wide { grid-column: 1 / -1; }

.health { display: grid; margin: 0; }

.health-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s4);
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}
.health-row:last-child { border-bottom: 0; }

.health dt { display: flex; align-items: center; gap: 0.55rem; color: var(--text-2); font-size: 0.89rem; }
.health dd { margin: 0; font-variant-numeric: tabular-nums; font-weight: 560; text-align: right; }

.empty { padding: var(--s6) var(--s4); text-align: center; color: var(--text-3); font-size: 0.9rem; }

/* -------------------------------------------------------------- 8. captcha */

.captcha {
  display: grid;
  gap: var(--s3);
  padding: var(--s4);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface-2);
}

.captcha-head { display: flex; align-items: center; justify-content: space-between; gap: var(--s3); }

.captcha-image {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 92px;
  padding: var(--s2);
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  overflow: hidden;
}

/* Il campo della risposta si comporta come un campo codice: caratteri
   grandi, centrati e distanziati. Un input normale con dentro cinque
   caratteri sparsi a sinistra non comunica che li' va ricopiato un codice. */
.captcha-answer {
  text-align: center;
  font-family: var(--mono);
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: 0.4em;
  /* L'ultimo carattere ha la spaziatura a destra come gli altri: senza
     questo rientro il testo appare spostato a sinistra. */
  text-indent: 0.4em;
  padding: 0.6rem 0.5rem;
}

.captcha-answer::placeholder {
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-indent: 0;
}

.captcha-image img {
  max-width: 100%;
  height: auto;
  /* Non impedisce niente a un bot: evita che un utente creda di poter
     selezionare e copiare il testo. */
  user-select: none;
  -webkit-user-drag: none;
  transition: opacity var(--fast);
}
.captcha-image[data-loading='true'] img { opacity: 0.25; }

/* Il proof-of-work resta invisibile finche' e' veloce. Se supera il secondo,
   la barra compare: meglio una barra che un bottone che sembra bloccato. */
.captcha-pow { display: grid; gap: 0.3rem; font-size: 0.78rem; color: var(--text-3); }
.captcha-pow-track { height: 3px; border-radius: var(--r-full); background: var(--surface-3); overflow: hidden; }
.captcha-pow-fill {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
  border-radius: var(--r-full);
  transition: width 120ms linear;
}

/* ------------------------------------------------------------- 9. utilita' */

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.toasts {
  position: fixed;
  z-index: 60;
  right: var(--s4);
  bottom: var(--s4);
  display: grid;
  gap: var(--s2);
  max-width: min(23rem, calc(100vw - 2rem));
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--s3);
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-md);
  background: var(--surface);
  box-shadow: var(--shadow-3);
  font-size: 0.89rem;
  pointer-events: auto;
  animation: toast-in var(--slow) both;
}
.toast[data-tone='ok']   { border-color: color-mix(in srgb, var(--ok) 45%, var(--border)); }
.toast[data-tone='bad']  { border-color: color-mix(in srgb, var(--bad) 45%, var(--border)); }
.toast[data-tone='warn'] { border-color: color-mix(in srgb, var(--warn) 45%, var(--border)); }
.toast[data-leaving='true'] { animation: toast-out var(--fast) both; }

.toast-body { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.toast-icon { margin-top: 0.1rem; }
.toast[data-tone='ok']   .toast-icon { color: var(--ok); }
.toast[data-tone='bad']  .toast-icon { color: var(--bad); }
.toast[data-tone='warn'] .toast-icon { color: var(--warn); }
.toast[data-tone='info'] .toast-icon { color: var(--accent); }

@keyframes toast-in  { from { opacity: 0; transform: translateY(10px) scale(0.97); } }
@keyframes toast-out { to   { opacity: 0; transform: translateX(14px); } }

/* -------------------------------------------------------------- 10. mobile */

@media (max-width: 680px) {
  .topbar { padding: 0.6rem var(--s4); }
  .topbar-sep { display: none; }

  .lobby,
  .admin { padding: var(--s5) var(--s3) var(--s7); }

  .card { padding: var(--s4); border-radius: var(--r-md); }

  .grid { grid-template-columns: 1fr; padding: var(--s2); gap: var(--s2); }
  .tile { aspect-ratio: 4 / 3; }

  .btn-round { width: 2.7rem; height: 2.7rem; }
  .controls { padding: var(--s2) var(--s3) var(--s4); }

  .toasts { right: var(--s3); left: var(--s3); bottom: var(--s3); max-width: none; }
}