/* Pagine di presentazione (slide) */
.viewer-page { background: linear-gradient(180deg, var(--navy-900), var(--navy-950) 60%); min-height: 100vh; color: #b9c7dc; }
.viewer-head { display: flex; align-items: center; justify-content: space-between; padding: 22px 0; }
.viewer-back { color: #dbe5f3; font-weight: 600; padding: .5em 1em; border-radius: 999px; border: 1px solid rgba(255,255,255,.2); text-decoration: none !important; }
.viewer-back:hover { background: rgba(255,255,255,.08); }
.viewer-logo { height: 34px; width: auto; background: #fff; padding: 6px 12px; border-radius: 10px; box-sizing: content-box; }
.viewer-logo--tall { height: 44px; }

.viewer { padding-bottom: 48px; text-align: center; }
.viewer h1 { color: #fff; font-size: clamp(1.4rem, 3vw, 2rem); margin: 8px 0 22px; }
.viewer__stage { position: relative; background: #fff; border-radius: 18px; padding: clamp(8px, 1.5vw, 16px); box-shadow: 0 30px 60px -20px rgba(0,0,0,.6); }
.viewer__img { width: 100%; max-height: 72vh; object-fit: contain; margin: 0 auto; border-radius: 10px; }
.viewer__prev, .viewer__next {
  position: absolute; top: 50%; transform: translateY(-50%); width: 48px; height: 48px; border-radius: 50%;
  border: 0; background: rgba(11, 31, 58, .85); color: #fff; font-size: 1.1rem; box-shadow: var(--shadow); transition: background .2s;
}
.viewer__prev:hover, .viewer__next:hover { background: var(--blue-500); }
.viewer__prev { left: -24px; }
.viewer__next { right: -24px; }
.viewer__count { margin: 16px 0; font-weight: 600; color: #dbe5f3; }
.viewer__thumbs { position: relative; display: flex; gap: 10px; overflow-x: auto; padding: 6px 4px 12px; scrollbar-width: thin; }
.viewer__thumbs button { flex: none; width: 120px; padding: 0; border: 2px solid transparent; border-radius: 8px; overflow: hidden; background: #fff; opacity: .55; transition: opacity .2s, border-color .2s; }
.viewer__thumbs button:hover { opacity: .9; }
.viewer__thumbs button.is-active { opacity: 1; border-color: var(--cyan-400); }
.viewer__hint { font-size: .85rem; color: #8ea3c2; margin-top: 10px; }

@media (max-width: 700px) {
  .viewer__prev { left: 6px; }
  .viewer__next { right: 6px; }
  .viewer__prev, .viewer__next { width: 40px; height: 40px; }
  .viewer__thumbs button { width: 90px; }
}