/* letter.css — tipografia della lettera, firma e controlli UI */

.letter {
  position: relative;
  width: 100%;
  height: 100%;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  min-height: 0;
  color: var(--ink);
  opacity: 0; /* rivelata dopo lo srotolamento */
}

/* Data in alto: resta fissa, non scorre col resto della lettera */
.letter__date {
  flex: 0 0 auto;
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: var(--text-date);
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-align: right;
  margin-bottom: clamp(0.5rem, 2.5%, 1rem);
  clip-path: inset(0 0 0 0); /* la data compare con un piccolo fade, non scritta a mano */
  opacity: 0;
}

/* Area scorrevole: la pergamena è un lungo rotolo, questa è la "finestra" su di esso */
.letter__scroll {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  scrollbar-width: none;
}
.letter__scroll::-webkit-scrollbar { display: none; }

.letter__content {
  position: relative; /* riferimento per il posizionamento assoluto della penna */
  padding-top: clamp(1.2rem, 4vw, 1.8rem); /* piccolo respiro, non uno spazio vuoto grande */
  padding-bottom: 38vh; /* spazio dopo la firma, si scorre fino in fondo comodamente */
}

/* Saluto */
.letter__salutation {
  font-family: var(--font-flourish);
  font-size: var(--text-salute);
  line-height: 1;
  color: var(--ink);
  margin-bottom: clamp(0.5rem, 2.5%, 1rem);
}

/* Corpo: paragrafi che vanno a capo normalmente (il browser gestisce il wrap) */
.para {
  font-family: var(--font-script);
  font-size: var(--text-body);
  line-height: 1.32;
  font-weight: 500;
  margin-bottom: clamp(0.7rem, 3%, 1.3rem);
}

/* Chiusura */
.letter__closing {
  font-family: var(--font-script);
  font-size: calc(var(--text-body) * 1.05);
  margin-top: clamp(0.2rem, 1%, 0.5rem);
  margin-bottom: clamp(0.4rem, 2%, 0.8rem);
}

/* parola: unità rivelabile della scrittura live */
.w {
  display: inline-block;
  color: var(--ink);
  text-shadow: 0 0 0.6px color-mix(in oklab, var(--ink) 60%, transparent); /* leggero bleed */
  opacity: 0;
  filter: blur(1.6px);
  transform: translateY(0.05em);
}

/* Firma */
.letter__sign {
  margin-top: clamp(0.3rem, 1.5%, 0.7rem);
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}
.sign-name {
  display: inline-block;
  font-family: var(--font-flourish);
  font-size: var(--text-sign);
  line-height: 0.9;
  color: var(--ink);
  text-shadow: 0 0 0.6px color-mix(in oklab, var(--ink) 60%, transparent);
  opacity: 0;
  filter: blur(2px);
}
.sign-flourish {
  width: clamp(120px, 40%, 200px);
  height: auto;
  margin-top: -0.2em;
  overflow: visible;
}
.sign-flourish path {
  fill: none;
  stroke: var(--ink);
  stroke-width: 2.2;
  stroke-linecap: round;
  opacity: 0.85;
}

/* --- Controlli UI --- */
.ui-btn {
  position: fixed;
  z-index: 12;
  font-family: var(--font-serif);
  border: 1px solid color-mix(in oklab, var(--gold) 45%, transparent);
  color: color-mix(in oklab, var(--gold-hi) 90%, #fff 10%);
  background: color-mix(in oklab, var(--void) 70%, transparent);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  cursor: pointer;
  transition: transform var(--d-fast) var(--ease-soft),
              background var(--d-fast) var(--ease-soft),
              opacity var(--d-normal) var(--ease-soft),
              border-color var(--d-fast) var(--ease-soft);
}
.ui-btn:hover { background: color-mix(in oklab, var(--void) 45%, transparent); }
.ui-btn:active { transform: scale(0.94); }

/* Mute (in alto a destra) */
.mute {
  top: max(1rem, env(safe-area-inset-top));
  right: max(1rem, env(safe-area-inset-right));
  width: 42px; height: 42px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 1rem;
}

/* Canzone (sotto al mute, stesso stile) */
.song {
  top: calc(max(1rem, env(safe-area-inset-top)) + 52px);
  right: max(1rem, env(safe-area-inset-right));
  width: 42px; height: 42px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 0.95rem;
  opacity: 0;
  pointer-events: none;
}
.song.is-visible { opacity: 1; pointer-events: auto; }
.song.is-playing { border-color: color-mix(in oklab, var(--gold-hi) 70%, transparent); }

/* Salta (in basso a destra, visibile durante l'animazione) */
.skip {
  bottom: max(1.1rem, env(safe-area-inset-bottom));
  right: max(1rem, env(safe-area-inset-right));
  padding: 0.5rem 1rem;
  border-radius: 999px;
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  opacity: 0;
  pointer-events: none;
}

/* Salva (in basso al centro, compare alla fine) */
.save {
  left: 50%;
  bottom: max(1.4rem, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  padding: 0.85rem 1.8rem;
  border-radius: 999px;
  font-size: clamp(0.78rem, 0.7rem + 0.5vw, 0.95rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--void-deep);
  background: linear-gradient(160deg, var(--gold-hi), var(--gold) 60%, var(--gold-lo));
  border-color: var(--gold-hi);
  box-shadow: 0 8px 26px color-mix(in oklab, var(--gold) 40%, transparent),
              0 0 0 1px color-mix(in oklab, var(--gold-hi) 60%, transparent) inset;
  opacity: 0;
  pointer-events: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-weight: 600;
}
.save.is-visible { opacity: 1; pointer-events: auto; }
.save.is-busy { opacity: 0.7; pointer-events: none; }
.skip.is-visible { opacity: 0.8; pointer-events: auto; }

@media (prefers-reduced-motion: reduce) {
  .ui-btn { transition: opacity var(--d-normal) linear; }
}