/* Componenti riutilizzabili. Colori solo da token (css/tokens.css). */

/* ---------- Pulsanti ---------- */
.btn {
  --spin: currentColor;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-height: 48px;
  padding: 0 var(--sp-5);
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  transition:
    background-color var(--dur-fast) ease,
    border-color var(--dur-fast) ease,
    color var(--dur-fast) ease,
    box-shadow var(--dur-fast) ease,
    opacity var(--dur-fast) ease,
    transform var(--dur-fast) var(--ease-out);
}
.btn svg { width: 20px; height: 20px; flex: none; }
.btn-block { width: 100%; }
.btn:active:not(:disabled) { transform: scale(0.98); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; box-shadow: none; }
/* Durante l'attesa il pulsante e' disabilitato ma deve restare leggibile
   (spinner a piena opacita'), non con l'opacita' ridotta di :disabled. */
.btn[aria-busy="true"]:disabled { opacity: 1; }

.btn-primary { background: var(--primary); color: var(--on-primary); box-shadow: var(--shadow-1); --spin: var(--on-primary); }
.btn-secondary { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
.btn-ghost { background: transparent; color: var(--primary); }

@media (hover: hover) {
  .btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
  .btn-secondary:hover:not(:disabled) { background: var(--surface-2); border-color: color-mix(in srgb, var(--text) 34%, transparent); }
  .btn-ghost:hover:not(:disabled) { background: var(--primary-soft); }
}

/* Stato di attesa: testo nascosto, spinner al centro, dimensioni invariate */
.btn[aria-busy="true"] { color: transparent; pointer-events: none; }
.btn[aria-busy="true"]::after {
  content: '';
  position: absolute;
  inset: 0;
  margin: auto;
  width: 20px;
  height: 20px;
  border: 2.5px solid var(--spin);
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 700ms linear infinite;
}
.btn-primary[aria-busy="true"]::after { border-color: var(--on-primary); border-right-color: transparent; }
.btn-secondary[aria-busy="true"]::after { border-color: var(--text); border-right-color: transparent; }
.btn-ghost[aria-busy="true"]::after { border-color: var(--primary); border-right-color: transparent; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Pulsante solo icona (sempre con aria-label) */
.icon-btn {
  display: inline-grid;
  place-items: center;
  width: var(--tap);
  height: var(--tap);
  border-radius: var(--radius-full);
  color: var(--text-muted);
  transition: background-color var(--dur-fast) ease, color var(--dur-fast) ease, transform var(--dur-fast) var(--ease-out);
}
.icon-btn svg { width: 24px; height: 24px; }
.icon-btn:active { transform: scale(0.94); }
@media (hover: hover) { .icon-btn:hover { background: var(--surface-2); color: var(--text); } }

/* ---------- Moduli ---------- */
.field { display: grid; gap: var(--sp-2); }
.field + .field { margin-top: var(--sp-4); }
.label { font-size: var(--fs-sm); font-weight: var(--fw-semibold); color: var(--text); }
.input {
  width: 100%;
  min-height: 48px;
  padding: 0 var(--sp-4);
  background: var(--surface);
  color: var(--text);
  font-size: var(--fs-base);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  transition: border-color var(--dur-fast) ease, box-shadow var(--dur-fast) ease;
}
.input::placeholder { color: var(--text-muted); opacity: 1; }
@media (hover: hover) { .input:hover { border-color: color-mix(in srgb, var(--text) 36%, transparent); } }
.input:focus-visible { border-color: var(--primary); outline: 3px solid var(--focus); outline-offset: 2px; }
.input[aria-invalid="true"] { border-color: var(--danger); box-shadow: 0 0 0 1px var(--danger); }
.field-error {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  color: var(--danger);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  animation: fade-in var(--dur) var(--ease-out);
}
.field-error svg { width: 18px; height: 18px; flex: none; margin-top: 2px; }
.field-error:empty { display: none; }
.hint { color: var(--text-muted); font-size: var(--fs-sm); }

/* ---------- Card ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  padding: var(--sp-5);
}

/* ---------- Barra inferiore fissa (CTA raggiungibile col pollice) ---------- */
.bottom-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-header);
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding:
    var(--sp-3)
    calc(var(--sp-4) + env(safe-area-inset-right))
    calc(var(--sp-3) + env(safe-area-inset-bottom))
    calc(var(--sp-4) + env(safe-area-inset-left));
}
.bottom-bar-inner { max-width: var(--col); margin-inline: auto; display: flex; gap: var(--sp-3); }
.bottom-bar-inner > .btn { flex: 1; }

/* ---------- Barra di avanzamento ---------- */
.progress {
  position: relative;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--primary-soft);
  overflow: hidden;
}
.progress-fill {
  position: absolute;
  inset: 0;
  background: var(--primary);
  border-radius: inherit;
  transform-origin: left center;
  transform: scaleX(var(--value, 0));
  transition: transform var(--dur-slow) var(--ease-out);
}

/* ---------- Header statistiche: XP, streak, obiettivo giornaliero ---------- */
.stats { display: flex; align-items: center; gap: var(--sp-2); flex-wrap: wrap; }
.stat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: var(--tap);
  padding: 0 var(--sp-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  font-variant-numeric: tabular-nums;
  color: var(--text);
}
.stat svg { width: 20px; height: 20px; flex: none; }
.stat-xp svg { color: var(--primary); }
.stat-streak svg { color: var(--accent); }
.stat-streak.is-off svg { color: var(--text-muted); }
.ring { width: 28px; height: 28px; transform: rotate(-90deg); }
.ring circle { fill: none; stroke-width: 4; }
.ring-track { stroke: var(--primary-soft); }
.ring-value { stroke: var(--accent); stroke-linecap: round; }
.ring.is-done .ring-value { stroke: var(--success); }

.stat-goal .ring { flex: none; }
.progress-fill.is-done { background: var(--success); }

/* Etichetta lunga nei pulsanti: una riga con puntini */
.btn .btn-label { min-width: 0; overflow: hidden; text-overflow: ellipsis; }

/* ---------- Scheletri di caricamento ---------- */
.skel {
  display: block;
  background: color-mix(in srgb, var(--text) 9%, var(--surface));
  border-radius: var(--radius-sm);
  animation: skel-pulse 1s ease-in-out infinite alternate;
}
.skel-line { height: 14px; width: 60%; }
.skel-sm { width: 28%; height: 12px; }
@keyframes skel-pulse { from { opacity: 1; } to { opacity: 0.5; } }

/* ---------- Toast (in alto al centro) ---------- */
.toast-region {
  position: fixed;
  top: calc(var(--sp-4) + env(safe-area-inset-top));
  left: 50%;
  z-index: var(--z-toast);
  width: min(calc(100% - 2 * var(--sp-4)), 440px);
  transform: translateX(-50%);
  display: grid;
  gap: var(--sp-2);
  pointer-events: none;
}
.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-2);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  pointer-events: auto;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
}
.toast.is-in { opacity: 1; transform: none; }
.toast.is-out { opacity: 0; transform: translateY(-8px); transition-duration: var(--dur-fast); transition-timing-function: var(--ease-in); }
.toast svg { width: 20px; height: 20px; flex: none; margin-top: 1px; }
.toast-info svg { color: var(--primary); }
.toast-success svg { color: var(--success); }
.toast-error { border-color: color-mix(in srgb, var(--danger) 40%, var(--border)); }
.toast-error svg { color: var(--danger); }

/* ---------- Bottom sheet ---------- */
.sheet-layer {
  position: fixed;
  inset: 0;
  z-index: var(--z-sheet);
  display: flex;
  align-items: flex-end;
}
.sheet-layer:not(.is-open) { pointer-events: none; }
.sheet-scrim {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--gray-950) 40%, transparent);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-in);
}
.sheet {
  position: relative;
  width: 100%;
  background: var(--surface);
  color: var(--text);
  border-top: 4px solid var(--border);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  box-shadow: var(--shadow-sheet);
  padding:
    var(--sp-5)
    calc(var(--sp-4) + env(safe-area-inset-right))
    calc(var(--sp-4) + env(safe-area-inset-bottom))
    calc(var(--sp-4) + env(safe-area-inset-left));
  transform: translateY(100%);
  transition: transform var(--dur-fast) var(--ease-in);
}
.sheet-layer.is-open .sheet-scrim { opacity: 1; transition: opacity var(--dur) var(--ease-out); }
.sheet-layer.is-open .sheet { transform: none; transition: transform var(--dur) var(--ease-out); }
.sheet-inner { max-width: var(--col); margin-inline: auto; display: grid; gap: var(--sp-4); }
.sheet-head { display: flex; align-items: center; gap: var(--sp-3); }
.sheet-icon {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  flex: none;
  border-radius: var(--radius-full);
  background: var(--primary-soft);
  color: var(--primary);
}
.sheet-icon svg { width: 20px; height: 20px; }
.sheet-title { font-size: var(--fs-lg); font-weight: var(--fw-bold); color: var(--text); }
.sheet-body { color: var(--text); }
.sheet-body > * + * { margin-top: var(--sp-2); }
.sheet-actions { display: flex; gap: var(--sp-3); }
.sheet-actions > .btn { flex: 1; }

.sheet-success { border-top-color: var(--success); }
.sheet-success .sheet-icon { background: var(--success-soft); color: var(--success); }
.sheet-success .sheet-title { color: var(--success); }
.sheet-success .btn-primary { background: var(--success); }
.sheet-error { border-top-color: var(--danger); }
.sheet-error .sheet-icon { background: var(--danger-soft); color: var(--danger); }
.sheet-error .sheet-title { color: var(--danger); }
.sheet-error .btn-primary { background: var(--danger); }
@media (hover: hover) {
  .sheet-success .btn-primary:hover:not(:disabled),
  .sheet-error .btn-primary:hover:not(:disabled) { filter: brightness(1.08); }
}

/* ---------- Layout centrato (accesso, errori di avvio) ---------- */
.center-layout {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--sp-6);
}
.center-head { display: grid; gap: var(--sp-2); }
.lead { color: var(--text-muted); font-size: var(--fs-base); }
.brand-logo { width: 168px; height: auto; margin-bottom: var(--sp-4); }
@media (prefers-color-scheme: dark) {
  .brand-logo { background: var(--white); border-radius: var(--radius); padding: var(--sp-2); box-sizing: content-box; }
}
.state-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--primary-soft);
  color: var(--primary);
  margin-bottom: var(--sp-2);
}
.state-icon svg { width: 28px; height: 28px; }

/* ---------- Accesso: elenco opzioni e avviso di errore ---------- */
.login-options { display: grid; gap: var(--sp-4); }
.login-alert {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-4);
  border: 1px solid color-mix(in srgb, var(--danger) 45%, transparent);
  border-left: 4px solid var(--danger);
  border-radius: var(--radius);
  background: var(--danger-soft);
  color: var(--text);
  font-size: var(--fs-sm);
}
.login-alert[hidden] { display: none; }
.login-alert svg { width: 20px; height: 20px; flex: none; color: var(--danger); }
.login-divider { display: flex; align-items: center; gap: var(--sp-3); color: var(--text-muted); font-size: var(--fs-sm); }
.login-divider::before, .login-divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }

/* Azioni del modulo: barra fissa su telefono, in linea da 640px */
.form-actions { margin-top: var(--sp-5); }
@media (max-width: 639.98px) {
  .form-actions.bottom-bar-sm {
    position: fixed; left: 0; right: 0; bottom: 0; margin: 0;
    z-index: var(--z-header);
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding:
      var(--sp-3)
      calc(var(--sp-4) + env(safe-area-inset-right))
      calc(var(--sp-3) + env(safe-area-inset-bottom))
      calc(var(--sp-4) + env(safe-area-inset-left));
  }
}
@media (min-width: 640px) {
  .screen.has-bar-sm { padding-bottom: calc(var(--sp-4) + env(safe-area-inset-bottom)); }
}
@media (max-width: 639.98px) {
  .screen.has-bar-sm { padding-bottom: calc(96px + env(safe-area-inset-bottom)); }
}

/* ---------- Interruttore (role="switch") ---------- */
.switch {
  position: relative;
  flex: none;
  width: 52px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--border-strong);
  transition: background-color var(--dur-fast) ease;
}
/* Area di tocco di almeno 44px oltre il disegno */
.switch::before { content: ''; position: absolute; inset: -6px -2px; }
.switch-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 26px;
  height: 26px;
  border-radius: var(--radius-full);
  background: var(--white);
  box-shadow: var(--shadow-1);
  transition: transform var(--dur) var(--ease-out);
}
.switch[aria-checked="true"] { background: var(--primary); }
.switch[aria-checked="true"] .switch-thumb { transform: translateX(20px); }
.switch:focus-visible { outline-offset: 3px; }
@media (hover: hover) { .switch:hover { filter: brightness(1.06); } }

/* ---------- Indicatore offline ---------- */
.offline-pill {
  position: fixed;
  top: calc(var(--sp-2) + env(safe-area-inset-top));
  left: 50%;
  z-index: calc(var(--z-header) + 5);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px var(--sp-3);
  background: var(--text);
  color: var(--bg);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-2);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  transform: translateX(-50%);
  animation: fade-in var(--dur) var(--ease-out);
}
.offline-pill[hidden] { display: none; }
.offline-pill svg { width: 16px; height: 16px; }
/* Con la pill visibile il contenuto scende quanto basta per non finirci sotto */
body.is-offline #app { padding-top: 32px; }
body.is-offline .screen { min-height: calc(100dvh - 32px); }
body.is-offline .toast-region { top: calc(var(--sp-4) + 36px + env(safe-area-inset-top)); }

/* ---------- Nuova versione disponibile (in alto, come i toast, finche' non si sceglie) ---------- */
.update-banner {
  position: fixed;
  top: calc(var(--sp-4) + env(safe-area-inset-top));
  left: 50%;
  z-index: var(--z-toast);
  width: min(calc(100% - 2 * var(--sp-4)), 440px);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-2) var(--sp-2) var(--sp-4);
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-2);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  opacity: 0;
  transform: translate(-50%, -8px);
  transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
}
.update-banner.is-in { opacity: 1; transform: translate(-50%, 0); }
.update-banner > svg { width: 20px; height: 20px; flex: none; color: var(--primary); }
.update-banner-text { flex: 1; min-width: 0; }
.update-banner-btn { min-height: 44px; padding: 0 var(--sp-4); font-size: var(--fs-sm); }
.update-banner .icon-btn { flex: none; }
/* I toast scendono sotto il banner per non sovrapporsi */
body.has-update .toast-region { top: calc(var(--sp-4) + 72px + env(safe-area-inset-top)); }
body.is-offline .update-banner { top: calc(var(--sp-4) + 36px + env(safe-area-inset-top)); }
body.is-offline.has-update .toast-region { top: calc(var(--sp-4) + 108px + env(safe-area-inset-top)); }

/* ---------- Movimento ridotto: solo dissolvenze ---------- */
@keyframes btn-pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
@media (prefers-reduced-motion: reduce) {
  .btn:active:not(:disabled), .icon-btn:active { transform: none; }
  .btn[aria-busy="true"]::after { animation: btn-pulse 1.2s ease-in-out infinite; }
  .toast, .toast.is-out { transform: none; }
  .update-banner, .update-banner.is-in { transform: translateX(-50%); }
  .sheet, .sheet-layer.is-open .sheet { transform: none; opacity: 0; transition: opacity var(--dur) ease; }
  .sheet-layer.is-open .sheet { opacity: 1; }
  .progress-fill { transition: none; }
  .switch-thumb { transition: none; }
}