@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,500;0,600;1,500&family=Source+Sans+3:wght@400;500;600&display=swap');

:root {
  --ink-black: #14110f;
  --ink-black-2: #1c1815;
  --parchment: #ecdfc0;
  --parchment-shadow: #c9b586;
  --ink: #2a211a;
  --ink-soft: #5a4c3c;
  --ember: #b8542a;
  --ember-dark: #8f3f1e;
  --teal: #33534d;
  --focus-ring: #d98a5e;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background: var(--ink-black);
  color: var(--ink);
  font-family: 'Source Sans 3', sans-serif;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
  background:
    radial-gradient(ellipse at 50% -10%, #241f19 0%, var(--ink-black) 55%),
    var(--ink-black);
}

.scena {
  position: relative;
  width: 100%;
  max-width: 920px;
}

.scena__titolo-esterno {
  text-align: center;
  color: var(--parchment);
  font-family: 'Cormorant Garamond', serif;
  font-weight: 500;
  font-size: 1.05rem;
  letter-spacing: 0.03em;
  opacity: 0.75;
  margin: 0 0 18px;
}

.libro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--parchment);
  border-radius: 3px;
  box-shadow:
    0 30px 60px -20px rgba(0, 0, 0, 0.65),
    0 0 0 1px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  position: relative;
  animation: apri-libro 700ms cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

.libro::before {
  /* dorso del libro */
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 34px;
  margin-left: -17px;
  background: linear-gradient(
    90deg,
    rgba(0, 0, 0, 0.14),
    rgba(0, 0, 0, 0.03) 30%,
    rgba(0, 0, 0, 0.03) 70%,
    rgba(0, 0, 0, 0.14)
  );
  pointer-events: none;
  z-index: 2;
}

@keyframes apri-libro {
  from {
    opacity: 0;
    transform: perspective(1400px) rotateY(6deg) scale(0.97);
  }
  to {
    opacity: 1;
    transform: perspective(1400px) rotateY(0deg) scale(1);
  }
}

.pagina {
  padding: 56px 48px;
  position: relative;
}

.pagina--sinistra {
  background:
    radial-gradient(ellipse at 30% 20%, rgba(255, 255, 255, 0.35), transparent 55%),
    var(--parchment);
  border-right: 1px solid rgba(0, 0, 0, 0.06);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.pagina--destra {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.stemma {
  width: 54px;
  height: 54px;
  margin-bottom: 22px;
}

.stemma svg { width: 100%; height: 100%; display: block; }

.titolo-serie {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 600;
  font-style: italic;
  font-size: 2.6rem;
  line-height: 1.05;
  color: var(--ink);
  margin: 0 0 14px;
}

.sottotitolo {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink-soft);
  max-width: 34ch;
  margin: 0;
}

.linea-decorativa {
  width: 64px;
  height: 2px;
  background: var(--ember);
  margin: 26px 0;
  border: none;
}

.citazione {
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 1.05rem;
  color: var(--ink-soft);
  line-height: 1.5;
  border-left: 2px solid var(--parchment-shadow);
  padding-left: 16px;
  margin: 0;
}

.form-intestazione {
  margin-bottom: 28px;
}

.form-intestazione h2 {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 600;
  font-size: 1.7rem;
  margin: 0 0 6px;
  color: var(--ink);
}

.form-intestazione p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.tab-switch {
  display: flex;
  gap: 22px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--parchment-shadow);
}

.tab-switch button {
  background: none;
  border: none;
  padding: 0 0 10px;
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink-soft);
  cursor: pointer;
  position: relative;
  top: 1px;
}

.tab-switch button.attivo {
  color: var(--ink);
  border-bottom: 2px solid var(--ember);
}

.campo {
  margin-bottom: 18px;
}

.campo label {
  display: block;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

.campo input {
  width: 100%;
  padding: 11px 13px;
  font-size: 0.98rem;
  font-family: 'Source Sans 3', sans-serif;
  border: 1px solid var(--parchment-shadow);
  border-radius: 2px;
  background: #fbf6e9;
  color: var(--ink);
}

.campo input:focus {
  outline: none;
  border-color: var(--ember);
  box-shadow: 0 0 0 3px rgba(184, 84, 42, 0.18);
}

.pulsante-principale {
  width: 100%;
  padding: 13px;
  margin-top: 6px;
  background: var(--ember);
  color: #fbf1e2;
  border: none;
  border-radius: 2px;
  font-size: 1rem;
  font-family: 'Source Sans 3', sans-serif;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background 140ms ease;
}

.pulsante-principale:hover { background: var(--ember-dark); }

.pulsante-principale:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.messaggio {
  min-height: 20px;
  font-size: 0.85rem;
  color: var(--ember-dark);
  margin-top: 12px;
}

.riquadro { display: none; }
.riquadro.attivo { display: block; }

@media (max-width: 720px) {
  .libro { grid-template-columns: 1fr; }
  .libro::before { display: none; }
  .pagina--sinistra {
    border-right: none;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    padding-bottom: 34px;
  }
  .pagina { padding: 40px 30px; }
  .titolo-serie { font-size: 2.1rem; }
}

/* ───────────────────────────────────────────────
   Icone raster: rendering nitido senza sgranature
   ─────────────────────────────────────────────── */
/* Base: bicubic è lo standard del browser, garantisce contorni morbidi
   e ben interpolati su tutti i dispositivi, senza introdurre pixelatura.
   Su schermi Retina l'effetto è già eccellente; su schermi non-Retina
   la combinazione di `image-rendering: auto` e `-ms-interpolation-mode:
   bicubic` evita la sfocatura eccessiva mantenendo un aspetto pulito. */
img[src$=".png"] {
  image-rendering: auto;
}

@media (prefers-reduced-motion: reduce) {
  .libro { animation: none; }
}