:root {
  --ink: #1F2B47;
  --accent: #C4553E;
  --rule: #E2DDD5;
  --desk: #ECE9E4;
  color-scheme: light;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  color: var(--ink);
  background: var(--desk);
  min-height: 100vh;
}

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

/* barra in alto: solo la lingua */
.bar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: flex-end;
  padding: 8px max(10px, env(safe-area-inset-right), calc((100% - 900px) / 2))
           8px max(10px, env(safe-area-inset-left), calc((100% - 900px) / 2));
  background: #fff;
  border-bottom: 1px solid var(--rule);
}
.lang { position: relative; }

.flag {
  display: block;
  width: 21px;
  height: 14px;
  object-fit: cover;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(31, 43, 71, .14);
  flex: none;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 9px;
  height: 38px;
  padding: 0 12px 0 11px;
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  background: #fff;
  border: 1px solid #D6D0C6;
  border-radius: 8px;
  cursor: pointer;
}
.lang-btn:hover { border-color: var(--ink); }
.chev { color: #8A847A; transition: transform .15s; }
.lang-btn[aria-expanded="true"] .chev { transform: rotate(180deg); }

.lang-list {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  min-width: 100%;
  width: max-content;
  list-style: none;
  padding: 5px;
  background: #fff;
  border: 1px solid #D6D0C6;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(31, 43, 71, .14);
  outline: none;
}
.lang-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  padding: 0 34px 0 10px;
  font-size: 15px;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
}
.lang-list li.active { background: #F2EFEA; }
.lang-list li[aria-selected="true"] { font-weight: 600; }
.lang-list li[aria-selected="true"]::after {
  content: '';
  position: absolute;
  right: 12px;
  top: 50%;
  width: 5px;
  height: 10px;
  margin-top: -7px;
  border: solid var(--accent);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* pagine del PDF */
.pages {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 10px max(6px, env(safe-area-inset-right)) max(24px, env(safe-area-inset-bottom)) max(6px, env(safe-area-inset-left));
}
.pages img {
  display: block;
  width: 100%;
  max-width: 900px;
  height: auto;
  aspect-ratio: 210 / 297;
  background: #fff;
  box-shadow: 0 1px 2px rgba(31, 43, 71, .08), 0 6px 20px rgba(31, 43, 71, .08);
}
@media (min-width: 700px) {
  .pages { gap: 22px; padding-top: 24px; padding-bottom: 48px; }
}