/* /begin/ — the descent. An opt-in scroll prelude: the ten chapters as
   one fall, from the stars to the self, over the cosmic clips, resolving
   into the truck hero. Dark immersive theme; light type. */

@font-face {
  font-family: 'Newsreader';
  font-style: normal; font-weight: 400; font-display: swap;
  src: url('/fonts/Newsreader-Regular.woff2') format('woff2');
}
@font-face {
  font-family: 'Newsreader';
  font-style: italic; font-weight: 400; font-display: swap;
  src: url('/fonts/Newsreader-Italic.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal; font-weight: 400; font-display: swap;
  src: url('/fonts/JetBrainsMono-Regular.woff2') format('woff2');
}

:root {
  --void: #05060a;
  --paper: #f3efe6;
  --warm: #c9b79c;   /* kicker / accents on dark */
  --quiet: #a89f90;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }
html, body {
  margin: 0; padding: 0;
  background: var(--void);
  color: var(--paper);
  font-family: 'Newsreader', Georgia, serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---- fixed background stack ---- */
.bg-stack { position: fixed; inset: 0; z-index: 0; background: var(--void); }
.bg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1.4s ease;
  will-change: opacity;
}
.bg.active { opacity: 1; }

/* darkening + vignette so light type holds over any frame */
.scrim {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  background:
    radial-gradient(130% 90% at 50% 50%, rgba(5,6,10,0.18), rgba(5,6,10,0.66)),
    linear-gradient(180deg, rgba(5,6,10,0.5), rgba(5,6,10,0.32) 45%, rgba(5,6,10,0.58));
}

/* ---- beats ---- */
.prelude { position: relative; z-index: 2; }
.beat {
  min-height: 100svh;
  display: flex; align-items: center; justify-content: center;
  padding: 12vh 1.5rem;
  text-align: center;
}
.beat-inner {
  max-width: 34rem;
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 1s ease, transform 1s ease;
}
.beat.in .beat-inner { opacity: 1; transform: none; }

.beat-kicker {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--warm);
  margin: 0 0 1.1rem;
}
.beat-line {
  font-size: clamp(1.55rem, 4.4vw, 2.7rem);
  line-height: 1.32;
  font-weight: 400;
  letter-spacing: 0.004em;
  margin: 0;
  text-shadow: 0 2px 34px rgba(0,0,0,0.72);
}

/* ---- cover ---- */
.cover-mark {
  font-size: clamp(2.6rem, 7.5vw, 4.6rem);
  letter-spacing: 0.012em;
  margin: 0 0 0.7rem;
  text-shadow: 0 2px 40px rgba(0,0,0,0.7);
}
.cover-sub {
  font-style: italic;
  color: var(--quiet);
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  margin: 0 0 4.5rem;
}
.scroll-cue {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--warm);
  margin: 0;
  animation: cue 2.6s ease-in-out infinite;
}
@keyframes cue { 0%,100% { opacity: 0.35; } 50% { opacity: 1; } }

/* ---- finale ---- */
.finale-line {
  font-size: clamp(1.5rem, 4.2vw, 2.5rem);
  line-height: 1.34;
  font-style: italic;
  margin: 0 0 2.4rem;
  text-shadow: 0 2px 34px rgba(0,0,0,0.72);
}
.finale-actions { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; }
.finale-btn {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--paper);
  text-decoration: none;
  padding: 0.7rem 1.2rem;
  border: 1px solid rgba(243,239,230,0.4);
  border-radius: 2px;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.finale-btn:hover { border-color: var(--paper); background: rgba(243,239,230,0.08); }
.finale-btn.primary {
  background: var(--paper); color: var(--void); border-color: var(--paper);
}
.finale-btn.primary:hover { background: #fff; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .bg { transition: none; }
  .beat-inner { opacity: 1; transform: none; transition: none; }
  .scroll-cue { animation: none; opacity: 0.7; }
}