/* Úvodní stránka: připnutá scéna a kapitoly, které přes ni procházejí. */

.film { position: relative; background: #000; }

.film__scena { position: sticky; top: 0; height: 100svh; overflow: hidden; z-index: 0; }

.film__vrstva { position: absolute; inset: 0; opacity: 0; will-change: opacity, transform; }
.film__vrstva img,
.film__vrstva video { width: 100%; height: 100%; object-fit: cover; display: block; }

/* Video je světlejší než obě fotky, tak mu přidáme vlastní ztmavení,
   jinak by na něm bílý text nebyl čitelný. */
.film__vrstva--svetla::after { content: ''; position: absolute; inset: 0; background: rgba(0, 0, 0, .3); }

.film__stin {
  position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(90deg, rgba(0,0,0,.82) 0%, rgba(0,0,0,.45) 42%, rgba(0,0,0,0) 72%),
    linear-gradient(180deg, rgba(0,0,0,.7) 0%, rgba(0,0,0,0) 26%, rgba(0,0,0,0) 62%, rgba(0,0,0,.8) 100%);
}
.film__tma { position: absolute; inset: 0; pointer-events: none; background: #000; opacity: 0; }

.film__pribeh { position: relative; z-index: 2; margin-top: -100svh; }

.kapitola { min-height: 100svh; display: flex; align-items: center; padding: 0 var(--pad); }
.kapitola__text { max-width: 40rem; will-change: opacity, transform; }
.kapitola__cislo {
  font-size: .72rem; letter-spacing: .3em; color: rgba(255,250,250,.45);
  font-variant-numeric: tabular-nums; margin: 0 0 1.4rem;
}
.kapitola .kicker { margin-bottom: .9rem; }
.kapitola__nadpis {
  font-weight: 800; letter-spacing: -.045em; line-height: .88;
  font-size: clamp(3.4rem, 11vw, 9.5rem);
  text-shadow: 0 8px 60px rgba(0,0,0,.75);
}
.kapitola p {
  margin: 1.6rem 0 2.2rem; max-width: 34rem;
  font-size: clamp(1rem, 1.5vw, 1.2rem); line-height: 1.65;
  color: rgba(255,250,250,.86);
  text-shadow: 0 2px 24px rgba(0,0,0,.8);
}
.kapitola--zaver .kapitola__nadpis { font-size: clamp(2.2rem, 6vw, 5rem); line-height: 1.02; letter-spacing: -.035em; }

/* ukazatel postupu 01 —— 04 */
.ukazatel {
  position: fixed; z-index: 6; inset: auto 0 2rem 0;
  display: flex; align-items: center; justify-content: center; gap: 1.1rem;
  padding: 0 var(--pad);
  font-size: .76rem; letter-spacing: .2em; font-variant-numeric: tabular-nums;
  color: rgba(255,250,250,.6);
  opacity: 0; transition: opacity .4s; pointer-events: none;
}
.ukazatel__kolej { position: relative; width: min(38vw, 420px); height: 1px; background: rgba(255,250,250,.24); }
.ukazatel__beh { position: absolute; inset: 0 auto 0 0; width: 0%; background: var(--fg); }

.napoveda {
  position: fixed; z-index: 6; inset: auto var(--pad) 2rem auto;
  display: flex; align-items: center; gap: .7rem;
  font-size: .72rem; letter-spacing: .2em; text-transform: uppercase;
  color: rgba(255,250,250,.55); transition: opacity .4s; pointer-events: none;
}
.napoveda::after {
  content: ''; width: 1px; height: 26px;
  background: linear-gradient(var(--acc), transparent);
  animation: padani 2s ease-in-out infinite;
}
@keyframes padani {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(6px); opacity: .4; }
}

@media (max-width: 780px) {
  .film__stin {
    background: linear-gradient(180deg, rgba(0,0,0,.78) 0%, rgba(0,0,0,.35) 30%, rgba(0,0,0,.55) 60%, rgba(0,0,0,.9) 100%);
  }
  .kapitola { align-items: flex-end; padding-bottom: 7rem; }
  .ukazatel__kolej { width: 40vw; }
  .napoveda { display: none; }
}