/* ============================================================
   Reset, typography primitives, atmosphere, accessibility.
   ============================================================ */

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

* {
  margin: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 1rem);
}

body {
  background: var(--c-base);
  color: var(--c-ink);
  font-family: var(--f-body);
  font-size: var(--t-body);
  line-height: var(--lh-body);
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body[data-lock="1"] {
  overflow: hidden;
}

img,
video,
svg {
  display: block;
  max-width: 100%;
}

img,
video {
  height: auto;
}

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
  padding: 0;
}

/* ---------- headings ---------------------------------------- */

h1,
h2,
h3,
h4 {
  font-family: var(--f-display);
  font-weight: 700;
  line-height: var(--lh-snug);
  letter-spacing: var(--ls-display);
  text-transform: uppercase;
}

h1 {
  font-size: var(--t-d1);
}
h2 {
  font-size: var(--t-d2);
}
h3 {
  font-size: var(--t-d3);
}

p {
  text-wrap: pretty;
}

/* ---------- data voice --------------------------------------
   Mono is a semantic choice: if it's mono, it's measured data. */

.mono {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
}

.label {
  font-family: var(--f-mono);
  font-size: var(--t-label);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--c-ink-mute);
}

.lead {
  font-size: var(--t-lead);
  color: var(--c-ink-dim);
  max-width: var(--w-text);
}

.amber {
  color: var(--c-amber);
}

/* ---------- atmosphere: film grain --------------------------
   A single fixed SVG-noise layer over the whole page. It is what
   keeps large flat dark areas from looking like dead pixels. */

.grain {
  position: fixed;
  inset: -50%;
  z-index: var(--z-grain);
  pointer-events: none;
  opacity: 0.5;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.42'/%3E%3C/svg%3E");
  animation: grain-drift 6s steps(6) infinite;
}

@keyframes grain-drift {
  0% {
    transform: translate3d(0, 0, 0);
  }
  20% {
    transform: translate3d(-3%, 2%, 0);
  }
  40% {
    transform: translate3d(2%, -3%, 0);
  }
  60% {
    transform: translate3d(-2%, -2%, 0);
  }
  80% {
    transform: translate3d(3%, 1%, 0);
  }
  100% {
    transform: translate3d(0, 0, 0);
  }
}

/* Vignette keeps the eye centre-screen, like a headlight cone. */
.vignette {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-grain) - 1);
  pointer-events: none;
  background: radial-gradient(
    120% 90% at 50% 40%,
    transparent 40%,
    rgb(0 0 0 / 0.55) 100%
  );
}

/* ---------- accessibility ----------------------------------- */

:focus-visible {
  outline: 2px solid var(--c-amber);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

.skip {
  position: absolute;
  left: var(--s-4);
  top: var(--s-4);
  z-index: calc(var(--z-overlay) + 10);
  padding: var(--s-3) var(--s-5);
  background: var(--c-amber);
  color: var(--c-void);
  font-family: var(--f-mono);
  font-size: var(--t-label);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  transform: translateY(-200%);
  transition: transform var(--d-fast) var(--e-out);
}

.skip:focus {
  transform: translateY(0);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- reveal-on-scroll --------------------------------
   Default state is hidden-and-offset; .is-in is added by the
   IntersectionObserver in reveal.js. If JS never runs, the
   no-js fallback below keeps everything visible. */

[data-reveal] {
  opacity: 0;
  transform: translate3d(0, 26px, 0);
  transition:
    opacity var(--d-slow) var(--e-out),
    transform var(--d-slow) var(--e-out);
  transition-delay: var(--reveal-delay, 0ms);
}

[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

html.no-js [data-reveal] {
  opacity: 1;
  transform: none;
}

/* ---------- reduced motion ----------------------------------
   Motion here is decorative, never load-bearing: stripping it
   leaves the layout complete. */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .grain {
    animation: none;
  }
}