/* ============================================================
   base.css — reset, typography defaults, shared primitives.
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  /* On the native-scroll path (touch / reduced motion) anchor and focus
     scrolling must clear the fixed header. */
  scroll-padding-top: 6rem;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: auto;      /* handled by the custom smooth-scroll engine */
  background: var(--void);
}

body {
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  color: var(--fg);
  background: var(--void);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overscroll-behavior-y: none;
}

body.is-locked { overflow: hidden; }

img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }

:focus-visible {
  outline: 2px solid var(--ember);
  outline-offset: 3px;
  border-radius: var(--radius);
}

::selection { background: var(--ember); color: var(--void); }

/* ---------- Scroll container ---------- */
#scroll-content { will-change: transform; }

/* ---------- Layout ---------- */
.shell {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.bay { padding-block: var(--bay); position: relative; }
.section { position: relative; }

/* 12-col grid for editorial layouts */
.grid12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 2rem);
}
@media (max-width: 860px) { .grid12 { grid-template-columns: repeat(6, minmax(0, 1fr)); } }

/* ---------- Typography primitives ---------- */
.display {
  font-family: var(--font-display);
  /* --opsz picks an optical tier (see tokens.css); --soft/--wonk stay on the
     brand's warp unless an element deliberately steps off it. Custom props
     inherit, so an <em> inside a heading picks up its parent's tier for free. */
  --opsz: var(--opsz-poster);
  --soft: 30;
  --wonk: 1;
  font-variation-settings: 'opsz' var(--opsz), 'SOFT' var(--soft), 'WONK' var(--wonk);
  font-weight: 600;
  line-height: 0.92;
  letter-spacing: var(--track, -0.022em);
  text-wrap: balance;
}
.display--tight { line-height: 0.86; --track: -0.032em; }

/* Optical size tiers for .display. Tracking travels with the tier:
   big Fraunces needs negative tracking, Fraunces at reading size does not. */
.display--lg { --opsz: var(--opsz-display); --track: -0.018em; }
.display--md { --opsz: var(--opsz-title);   --track: -0.008em; }
.display--sm { --opsz: var(--opsz-text);    --track: 0em; }

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.05; }

.kicker {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--ember);
  display: flex;
  align-items: center;
  gap: 0.85em;
}
.kicker::before {
  content: '';
  width: clamp(1.75rem, 4vw, 3.5rem);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--ember));
  flex: none;
}
.kicker--blue { color: var(--tide); }
.kicker--blue::before { background: linear-gradient(90deg, transparent, var(--tide)); }

.index-num {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  color: var(--bone-ghost);
  letter-spacing: 0.15em;
}

.lede {
  font-size: var(--step-1);
  line-height: 1.5;
  color: var(--bone-dim);
  max-width: 46ch;
  text-wrap: pretty;
}

.prose p {
  color: var(--bone-dim);
  max-width: var(--measure);
  text-wrap: pretty;
}
.prose p + p { margin-top: 1.15em; }

.emph {
  font-family: var(--font-display);
  font-style: italic;
  /* Sits inline in 16–20px body copy, so it takes the text tier, not the
     poster tier — at opsz 144 an inline italic goes thin and disappears. */
  font-variation-settings: 'opsz' var(--opsz-text), var(--wonk-on);
  color: var(--bone);
}

.hl { color: var(--ember); }
.hl-blue { color: var(--tide); }

/* ---------- Rules & hairlines ---------- */
.rule { height: 1px; background: var(--line); border: 0; }
.rule--fade { background: linear-gradient(90deg, var(--line-strong), transparent); }

/* ---------- Buttons ---------- */
.btn {
  --btn-fg: var(--void);
  --btn-bg: var(--ember);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.7em;
  padding: 0.95em 1.6em;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--btn-fg);
  background: var(--btn-bg);
  border-radius: var(--radius-pill);
  isolation: isolate;
  overflow: hidden;
  transition: transform var(--dur) var(--ease-out), box-shadow var(--dur) var(--ease-out);
  box-shadow: 0 0 0 0 color-mix(in oklab, var(--ember) 40%, transparent);
  white-space: nowrap;
}
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 140% at 50% 120%, var(--ember-100), transparent 60%);
  opacity: 0;
  transition: opacity var(--dur) var(--ease-out);
  z-index: -1;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 12px 40px -12px color-mix(in oklab, var(--ember) 70%, transparent); }
.btn:hover::after { opacity: 1; }
.btn:active { transform: translateY(0); }
.btn .btn-arrow { transition: transform var(--dur) var(--ease-out); }
.btn:hover .btn-arrow { transform: translateX(4px); }

.btn--ghost {
  --btn-fg: var(--bone);
  --btn-bg: transparent;
  border: 1px solid var(--line-strong);
  backdrop-filter: blur(8px);
}
.btn--ghost:hover { border-color: var(--ember); color: var(--ember); box-shadow: none; }
.btn--ghost::after { display: none; }

/* ---------- Reveal system (driven by src/ui/reveal.js) ---------- */
[data-reveal] { opacity: 0; }
[data-reveal="up"]    { transform: translate3d(0, 28px, 0); }
[data-reveal="fade"]  { transform: none; }
[data-reveal="left"]  { transform: translate3d(-24px, 0, 0); }
[data-reveal="right"] { transform: translate3d(24px, 0, 0); }
[data-reveal].is-in {
  opacity: 1;
  transform: none;
  transition: opacity 900ms var(--ease-out), transform 1100ms var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}

/* Per-line masked text reveal */
.line-mask { display: block; overflow: hidden; }
.line-mask > span {
  display: block;
  transform: translate3d(0, 105%, 0);
  transition: transform 1100ms var(--ease-out);
  transition-delay: var(--line-delay, 0ms);
}
.is-in .line-mask > span, .line-mask.is-in > span { transform: none; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .line-mask > span { transform: none !important; }
}

/* ---------- Utility ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; top: 0; left: 50%; transform: translate(-50%, -140%);
  z-index: var(--z-overlay);
  background: var(--ember); color: var(--void);
  padding: 0.75rem 1.25rem; font-family: var(--font-mono); font-size: var(--step--1);
  border-radius: 0 0 var(--radius-md) var(--radius-md); transition: transform var(--dur) var(--ease-out);
}
.skip-link:focus-visible { transform: translate(-50%, 0); }

/* Film grain + vignette overlay across the whole page */
.grain {
  position: fixed; inset: -50%;
  z-index: 45;
  pointer-events: none;
  opacity: 0.05;
  background-image: var(--grain-url);
  background-size: 180px 180px;
  animation: grain 6s steps(6) infinite;
  mix-blend-mode: overlay;
}
@keyframes grain {
  0%,100% { transform: translate(0,0) }
  16%     { transform: translate(-2%, 1%) }
  33%     { transform: translate(1%, -2%) }
  50%     { transform: translate(-1%, 2%) }
  66%     { transform: translate(2%, 1%) }
  83%     { transform: translate(1%, -1%) }
}
.vignette {
  position: fixed; inset: 0; z-index: 44; pointer-events: none;
  background: radial-gradient(120% 100% at 50% 45%, transparent 45%, rgba(0,0,0,0.55) 100%);
}
@media (prefers-reduced-motion: reduce) { .grain { animation: none; } }