/* ==========================================================================
   Carosello fotografico della home. Caricato SOLO dalle due home (index.html
   e en/index.html), non dalle sottopagine: fuori dalla home le foto sono
   banner statici (.page-hero in site.css), non caroselli.
   Comportamento in assets/hero.js.
   ========================================================================== */

/* ---------- Carosello hero (solo home) ---------- */

.hero {
  position: relative;
  height: 100vh;
  height: 100svh;
  min-height: 480px;
  overflow: hidden;
  background: var(--ink-2);
}

.slides {
  position: absolute;
  inset: 0;
  z-index: var(--z-slides);
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1.1s var(--ease);
}

.slide.is-active {
  opacity: 1;
  z-index: 2;
}

.slide.is-leaving {
  opacity: 1;
  z-index: 1;
  transition: none;
}

.slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* stato base = frame iniziale del Ken Burns: il layer resta composito, niente scatti */
  transform: translate3d(0, 0, 0) scale3d(1.02, 1.02, 1);
  backface-visibility: hidden;
}

/* zoom d'arrivo: parte ampio e veloce, decelera e si FERMA sullo stato base.
   Il movimento lento continuo causava shimmer sub-pixel sui dettagli fini;
   da fermo l'immagine resta nitida. */
.slide.is-active img,
.slide.is-leaving img {
  animation: kb-a 2.6s cubic-bezier(0.33, 1, 0.68, 1) forwards;
  will-change: transform;
}
.slide:nth-child(even).is-active img,
.slide:nth-child(even).is-leaving img {
  animation-name: kb-b;
}

@keyframes kb-a {
  from { transform: translate3d(1.4%, -0.9%, 0) scale3d(1.09, 1.09, 1); }
  to   { transform: translate3d(0, 0, 0) scale3d(1.02, 1.02, 1); }
}
@keyframes kb-b {
  from { transform: translate3d(-1.4%, 0.9%, 0) scale3d(1.09, 1.09, 1); }
  to   { transform: translate3d(0, 0, 0) scale3d(1.02, 1.02, 1); }
}

.scrim {
  position: absolute;
  left: 0;
  right: 0;
  z-index: var(--z-scrim);
  pointer-events: none;
}
.scrim-top {
  top: 0;
  height: clamp(110px, 18vh, 180px);
  background: linear-gradient(to bottom, oklch(10% 0.01 255 / 0.62), transparent);
}
.scrim-bottom {
  bottom: 0;
  height: min(55vh, 480px);
  background: linear-gradient(to top, oklch(10% 0.01 255 / 0.82), oklch(10% 0.01 255 / 0.35) 45%, transparent);
}

.hero-bar {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-hero-ui);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem 3rem;
  padding: 0 var(--pad) clamp(1.5rem, 4.5vh, 3rem);
}

.hero-copy h1 {
  font-size: clamp(2.4rem, 6.5vw, 4.75rem);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.025em;
  text-wrap: balance;
  text-shadow: 0 2px 28px oklch(10% 0.01 255 / 0.5);
}

.hero-copy .tagline {
  margin-top: 0.9rem;
  max-width: 48ch;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  font-weight: 500;
  color: oklch(94% 0.006 250);
  text-shadow: 0 1px 16px oklch(10% 0.01 255 / 0.6);
  text-wrap: pretty;
}

.hero-copy .photo-credit {
  margin-top: 0.65rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: oklch(88% 0.01 250);
  text-shadow: 0 1px 12px oklch(10% 0.01 255 / 0.7);
}

/* ---------- Controlli carosello ---------- */

.hero-controls {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.9rem;
  margin-left: auto;
}

.no-js .hero-controls { display: none; }

.segments {
  display: flex;
  gap: 7px;
  width: clamp(170px, 22vw, 300px);
}

.seg {
  flex: 1;
  min-width: 0;
  height: 26px;
  padding: 11px 0;
  background: none;
  border: 0;
  cursor: pointer;
  position: relative;
}

.seg::before {
  content: "";
  display: block;
  height: 4px;
  border-radius: 999px;
  background: oklch(100% 0 0 / 0.32);
  box-shadow: 0 1px 6px oklch(10% 0.01 255 / 0.35);
  transition: background 0.25s var(--ease);
}
.seg.is-active::before { background: oklch(100% 0 0 / 0.55); }

.seg::after {
  content: "";
  position: absolute;
  top: 11px;
  left: 0;
  height: 4px;
  width: 100%;
  border-radius: 999px;
  background: oklch(100% 0 0 / 0.95);
  transform: scaleX(0);
  transform-origin: left;
}

.seg.is-active::after {
  animation: seg-fill var(--interval, 5s) linear forwards;
}
.hero.is-paused .seg.is-active::after {
  animation-play-state: paused;
}
@keyframes seg-fill {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}

.ctrl-buttons {
  display: flex;
  gap: 0.6rem;
}

.ctrl {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid oklch(100% 0 0 / 0.35);
  background: oklch(15% 0.01 255 / 0.32);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text);
  cursor: pointer;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), transform 0.15s var(--ease);
}
.ctrl:hover {
  background: oklch(15% 0.01 255 / 0.58);
  border-color: oklch(100% 0 0 / 0.6);
}
.ctrl:active { transform: scale(0.94); }
.ctrl svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.ctrl .icon-play { display: none; }
.hero.is-paused .icon-pause { display: none; }
.hero.is-paused .icon-play { display: block; }

/* ---------- Mobile (solo hero) ---------- */

@media (max-width: 680px) {
  .hero-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 1.4rem;
  }

  .hero-controls {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    margin-left: 0;
  }

  .segments {
    flex: 1;
    width: auto;
    margin-right: 1rem;
  }
}

/* ---------- Reduced motion (solo hero) ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .slide { transition-duration: 0.3s; }

  .slide.is-active img,
  .slide.is-leaving img {
    animation: none;
  }

  .seg.is-active::after {
    animation: none;
    transform: scaleX(1);
  }
}