/* ═══════════════════════════════════════════════════════
   Cinema-Stack Scroll
   4 full-viewport panels stack on top of each other as
   the user scrolls. Activates after html.intro-done and
   only on screens ≥ 768 px.
   ═══════════════════════════════════════════════════════ */

/* ── Default (mobile / pre-intro): panels flow normally ── */
.stack-wrap {
  position: relative;
}

.stack-panel {
  position: relative;
}

/* ── Desktop + post-intro: cinema stack ── */
@media (min-width: 768px) {
  html.intro-done .stack-wrap {
    height: auto;
    min-height: 520vh; /* base stack track + extra for About + marquee below fold */
  }

  html.intro-done .stack-panel {
    position: sticky;
    top: 0;
    height: 100vh;
    overflow: hidden;
    transform-origin: center top;
    /* JS drives transform/filter — no CSS transition so it follows scroll 1:1 */
  }

  /* Panel stacking order */
  html.intro-done .stack-panel--1 {
    z-index: 10;
    background: #f4f3ef; /* cream — matches hero */
  }
  html.intro-done .stack-panel--2 {
    z-index: 20;
    background: #c21f1f; /* red — matches work-0 */
  }
  html.intro-done .stack-panel--3 {
    z-index: 30;
    background: #000000; /* black — matches svc */
  }
  /* About + marquee: tall panel, no clip; flex stacks section then .mrq */
  html.intro-done .stack-panel--4 {
    z-index: 40;
    background: #f4f3ef; /* cream — matches abt */
    height: auto;
    min-height: 100vh;
    overflow: visible;
    display: flex;
    flex-direction: column;
  }

  /* Inner sections fill the 100 vh panel (panels 1–3) */
  html.intro-done .stack-panel > section {
    height: 100vh;
    min-height: 100vh;
  }

  html.intro-done .stack-panel--4 > section.abt {
    height: auto;
    min-height: 100vh;
    flex: 0 0 auto;
    overflow: visible; /* override about.css .abt overflow:hidden so copy + marquee aren’t clipped */
  }

  html.intro-done .stack-panel--4 > .mrq {
    position: relative;
    z-index: 1;
    flex-shrink: 0;
    width: 100%;
  }
}

/* Reduce motion: no scale/filter */
@media (prefers-reduced-motion: reduce) {
  html.intro-done .stack-panel {
    transform: none !important;
    filter: none !important;
  }
}