/* Base: fonts, reset, typography, layout primitives, reveal + scene machinery. */

@font-face {
  font-family: "Poppins"; font-style: normal; font-weight: 400; font-display: swap;
  src: url("../fonts/poppins-400.woff2") format("woff2");
}
@font-face {
  font-family: "Poppins"; font-style: normal; font-weight: 500; font-display: swap;
  src: url("../fonts/poppins-500.woff2") format("woff2");
}
@font-face {
  font-family: "Poppins"; font-style: italic; font-weight: 400; font-display: swap;
  src: url("../fonts/poppins-italic-400.woff2") format("woff2");
}
@font-face {
  font-family: "Poppins"; font-style: italic; font-weight: 500; font-display: swap;
  src: url("../fonts/poppins-italic-500.woff2") format("woff2");
}
@font-face {
  font-family: "Poppins"; font-style: normal; font-weight: 600; font-display: swap;
  src: url("../fonts/poppins-600.woff2") format("woff2");
}
@font-face {
  font-family: "Poppins"; font-style: normal; font-weight: 700; font-display: swap;
  src: url("../fonts/poppins-700.woff2") format("woff2");
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--size-body);
  line-height: var(--leading-body);
  color: var(--ink);
  background: var(--bg);
  transition: background-color var(--t-world) var(--ease-out), color var(--t-world) var(--ease-out);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
img, video, svg, canvas { max-width: 100%; height: auto; display: block; }

h1, h2, h3 { font-family: var(--font-display); line-height: var(--leading-display); margin: 0; }
h1 { font-size: var(--size-hero); font-weight: 700; letter-spacing: var(--track-display); text-wrap: balance; }
h2 { font-size: var(--size-h2); font-weight: 600; letter-spacing: var(--track-display); text-wrap: balance; }
h3 { font-size: var(--size-h3); font-weight: 600; }
p { margin: 0; max-width: var(--measure); }
p + p { margin-top: var(--sp-4); }
a { color: inherit; }
::selection { background: var(--orange); color: #fff; }

.mute { color: var(--ink-mute); }
.accent { color: var(--accent-text); }
.mono { font-family: var(--font-mono); font-size: 0.85em; letter-spacing: 0.01em; }

/* Layout */
.chapter { padding: var(--section-pad) var(--sp-6); position: relative; }
.chapter-inner { max-width: var(--content-max); margin: 0 auto; }
.chapter-head { max-width: var(--measure); margin-bottom: var(--sp-12); }
.chapter-head h2 { margin-bottom: var(--sp-6); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  font-family: var(--font-display); font-weight: 600; font-size: 1rem;
  padding: 0.85em 1.7em; border-radius: 999px; border: 1px solid transparent;
  cursor: pointer; text-decoration: none;
  transition: transform var(--t-fast) var(--ease-out), box-shadow var(--t-fast) var(--ease-out),
              background-color var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out);
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--orange); color: #fff; }
.btn-primary:hover { background: #F06F15; box-shadow: 0 6px 24px var(--orange-glow); transform: translateY(-1px); }
.btn-primary:focus-visible, .btn-ghost:focus-visible { outline: 2px solid var(--accent-text); outline-offset: 3px; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink-mute); transform: translateY(-1px); }

/* Reveal machinery — engine.js adds .is-in when the element enters. */
[data-reveal] {
  opacity: 0; transform: translateY(16px);
  transition: opacity var(--t-reveal) var(--ease-out), transform var(--t-reveal) var(--ease-out);
  transition-delay: calc(var(--reveal-i, 0) * 90ms);
}
[data-reveal].is-in { opacity: 1; transform: none; }

/* Scrub scenes: engine.js drives --p (0 → 1) across the scene's scroll span. */
.scene { position: relative; }
.scene-sticky { position: sticky; top: 0; min-height: 100svh; display: flex; align-items: center; overflow: clip; }

/* Reduced motion: everything visible, nothing moves. */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  body { transition: none; }
  *, *::before, *::after { animation-duration: 0.001s !important; transition-duration: 0.001s !important; }
}

/* Slim header — appears after the hero. */
.site-head {
  position: fixed; inset: 0 0 auto 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--sp-3) var(--sp-6);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  transform: translateY(-110%);
  transition: transform var(--t-move) var(--ease-out), background-color var(--t-world) var(--ease-out);
}
.site-head.is-on { transform: none; }
.site-head .wordmark { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; text-decoration: none; }
.site-head .wordmark b { color: var(--accent-text); font-weight: 700; }
.site-head .btn { padding: 0.55em 1.2em; font-size: 0.9rem; }

/* Film lightbox */
dialog.film {
  border: 0; padding: 0; background: #000; border-radius: var(--radius);
  width: min(92vw, 1100px); box-shadow: var(--shadow-float);
}
dialog.film::backdrop { background: rgba(0, 0, 0, 0.82); backdrop-filter: blur(6px); }
dialog.film video { width: 100%; border-radius: var(--radius); }
dialog.film .film-close {
  position: absolute; top: -2.6rem; right: 0; background: none; border: 0;
  color: #fff; font-size: 1.6rem; cursor: pointer; line-height: 1;
}

/* Synthetic-content disclosure caption, shared by mock stages */
.stage-cap {
  font-size: var(--size-small);
  font-style: italic;
  color: var(--ink-faint);
  text-align: center;
  margin: var(--sp-4) auto 0;
  max-width: none;
}

footer.site-foot {
  padding: var(--sp-8) var(--sp-6); text-align: center;
  color: var(--ink-faint); font-size: var(--size-small);
}
footer.site-foot a { color: var(--ink-mute); }