/* ---------- film section ---------- */

.film { --scroll-per-second: 9svh; border-top: 1px solid var(--line); }

.film__intro {
  display: grid; gap: 1.1rem;
  padding: var(--space-section) var(--gutter) clamp(2rem, 6vh, 4rem);
  max-width: 60rem;
}
.film__intro h2 { font-size: var(--text-h2); }
.film__lede { color: var(--mute); max-width: 34rem; }

.film__layout {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 8fr);
  grid-template-areas: "chapters stage";
  column-gap: clamp(2rem, 4vw, 4.5rem);
  padding-inline: var(--gutter);
}

.film__stage {
  grid-area: stage;
  position: sticky; top: 0;
  height: 100svh;
  display: flex; flex-direction: column; justify-content: center; gap: 1.1rem;
  padding-block: 4vh;
}

.film__frame {
  position: relative; margin: 0;
  aspect-ratio: 848 / 528;
  max-height: calc(100svh - 9rem); /* short viewports: letterbox rather than overflow */
  background: #000 url("../media/poster.jpg") center / contain no-repeat;
  box-shadow: 0 40px 120px -40px rgb(69 227 166 / 0.22), 0 0 0 1px var(--line);
  transition: box-shadow 700ms var(--ease-out);
}
/* HUD corner brackets */
.film__frame::before, .film__frame::after {
  content: ""; position: absolute; width: 22px; height: 22px; pointer-events: none;
  border: 1px solid var(--teal); opacity: 0.7; transition: border-color 700ms var(--ease-out);
}
.film__frame::before { top: -8px; left: -8px; border-right: 0; border-bottom: 0; }
.film__frame::after { bottom: -8px; right: -8px; border-left: 0; border-top: 0; }

.film__video { display: block; width: 100%; height: 100%; object-fit: contain; background: transparent; }
.film__video::cue {
  font: 400 0.95rem/1.4 var(--font-display);
  background: rgb(5 8 14 / 0.78); color: var(--paper);
}

.film__hud {
  position: absolute; inset: auto 0 100% 0;
  display: flex; justify-content: space-between;
  padding-bottom: 0.7rem;
  font: 500 var(--text-label) / 1 var(--font-mono); letter-spacing: 0.14em; color: var(--mute);
  font-variant-numeric: tabular-nums;
}
.film__hud-counter { color: var(--paper); }

.film__fallback {
  display: none; position: absolute; inset: auto 0 0 0; padding: 0.9rem 1rem;
  background: rgb(5 8 14 / 0.85); color: var(--mute); font-size: 0.9rem;
}
.film.is-media-failed .film__fallback { display: block; }

.film__controls { display: flex; align-items: center; gap: 1rem; }

.film-rail {
  --progress: 0;
  position: relative; flex: 1; display: flex; gap: 3px; height: 28px; align-items: center;
}
.film-rail__step {
  position: relative; min-width: 8px; height: 100%; padding: 0; border: 0; cursor: pointer;
  background: transparent;
}
.film-rail__step::before {
  content: ""; position: absolute; inset: 12px 0; background: var(--line-strong);
  transition: background-color var(--duration) var(--ease-out), inset var(--duration) var(--ease-out);
}
.film-rail__step:hover::before { inset: 10px 0; background: var(--mute); }
.film-rail__step[aria-current]::before { inset: 9px 0; background: var(--teal); }
/* overall playhead */
.film-rail::after {
  content: ""; position: absolute; left: 0; bottom: 2px; height: 1px; width: 100%;
  background: var(--amber); transform-origin: left; transform: scaleX(var(--progress));
  pointer-events: none;
}

.film__buttons { display: flex; gap: 0.5rem; }
.film-button {
  padding: 0.6rem 0.9rem; border: 1px solid var(--line-strong); background: transparent; color: var(--paper);
  font: 500 var(--text-label) / 1 var(--font-mono); letter-spacing: 0.12em; text-transform: uppercase;
  cursor: pointer; white-space: nowrap;
  transition: border-color var(--duration) var(--ease-out), background-color var(--duration) var(--ease-out), color var(--duration) var(--ease-out);
}
.film-button:hover { border-color: var(--teal); }
.film-button:active { transform: translateY(1px); }
.film-button[aria-pressed="true"] { border-color: var(--teal); color: var(--teal); background: var(--teal-dim); }
.film-button--sound { display: inline-flex; align-items: center; gap: 0.55rem; border-color: var(--teal); }
.film-button__dot {
  width: 8px; height: 8px; border-radius: 50%; border: 1px solid currentColor;
  transition: background-color var(--duration) var(--ease-out);
}
.film-button--sound[aria-pressed="true"] .film-button__dot { background: currentColor; }
.film.is-awaiting-gesture .film-button--sound { background: var(--teal); color: var(--ink); }

/* ---------- chapters ---------- */

.film__chapters {
  grid-area: chapters;
  list-style: none; margin: 0;
  padding: 38svh 0 50svh;
}

.chapter {
  min-height: max(60svh, calc(var(--dur) * var(--scroll-per-second)));
  padding-block: 2rem;
  border-top: 1px solid var(--line);
  opacity: 0.55;
  transition: opacity 600ms var(--ease-out);
}
.chapter.is-active { opacity: 1; }

.chapter__meta {
  display: flex; gap: 0.9rem; align-items: baseline;
  font: 500 var(--text-label) / 1 var(--font-mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--mute);
}
.chapter__meta span { color: var(--teal); }
.chapter h3 { font-size: var(--text-h3); margin: 1.1rem 0 1rem; max-width: 18ch; }
.chapter > p:not(.chapter__meta) { max-width: 34rem; color: rgb(232 236 239 / 0.82); }

.chapter__narration {
  margin: 1.6rem 0 0; padding-left: 1rem; max-width: 32rem;
  border-left: 1px solid var(--amber);
  font: 400 0.86rem / 1.6 var(--font-mono); color: var(--mute);
}

/* failure chapter: semantic red accent on the stage */
.chapter[data-tone="fail"] .chapter__meta span { color: var(--signal); }
.film[data-tone="fail"] .film__frame { box-shadow: 0 40px 120px -40px rgb(255 95 82 / 0.28), 0 0 0 1px var(--line); }
.film[data-tone="fail"] .film__frame::before,
.film[data-tone="fail"] .film__frame::after { border-color: var(--signal); }
.film[data-tone="fail"] .film-rail__step[aria-current]::before { background: var(--signal); }

/* ---------- stacked layout: film pinned on top, chapters scroll beneath ---------- */

@media (max-width: 959px) {
  .film { --scroll-per-second: 7svh; }

  /* block, not grid: a sticky grid item is confined to its own row and would never pin */
  .film__layout { display: block; }

  .film__stage {
    z-index: 2; height: auto; gap: 0.6rem;
    margin-inline: calc(var(--gutter) * -1);
    padding: 2.4rem var(--gutter) 0.8rem;
    background: var(--ink);
  }
  .film__stage::after {
    content: ""; position: absolute; inset: 100% 0 auto; height: 2.5rem; pointer-events: none;
    background: linear-gradient(var(--ink), transparent);
  }
  .film__video::cue { font-size: 0.7rem; }
  .film__frame { max-height: 45svh; margin-inline: auto; }
  .film__frame::before, .film__frame::after { display: none; }
  .film__hud { padding-bottom: 0.5rem; }
  .film-button { padding: 0.55rem 0.7rem; }

  .film__chapters { padding: 6svh 0 40svh; }
  .chapter { min-height: max(48svh, calc(var(--dur) * var(--scroll-per-second))); }
}

/* ---------- reduced motion / static mode: normal flow, user-driven player ---------- */

.film[data-mode="static"] .film__stage { position: static; height: auto; }
.film[data-mode="static"] .film__chapters { padding-block: 2rem 4rem; }
.film[data-mode="static"] .chapter { min-height: 0; opacity: 1; }