/* =============================================================
   ZEGLER - Base: reset, elements, typography, utilities
   ============================================================= */

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

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

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

body {
  background-color: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: var(--leading-body);
  font-synthesis-weight: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;

  /* Paper texture. Painted as a normal background layer - a fixed,
     full-viewport overlay forces a composited layer and stalls repaints
     on scroll in some engines. */
  background-image: url("../img/grain.png");
  background-size: 64px 64px;
}

body.is-locked { overflow: hidden; }

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

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

button { background: none; border: 0; cursor: pointer; }

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

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

::selection {
  background: var(--deep);
  color: var(--bone);
}

/* ---- Focus -------------------------------------------------- */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--deep);
  outline-offset: 3px;
  border-radius: 3px;
}
.is-dark :focus-visible { outline-color: var(--beige); }

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: 0;
  z-index: 200;
  transform: translateY(-140%);
  background: var(--ink);
  color: var(--bone);
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 var(--radius-s) var(--radius-s);
  font-size: var(--step--1);
  transition: transform var(--dur) var(--ease-out);
}
.skip-link:focus-visible { transform: translateY(0); }

/* ---- Typography --------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  text-wrap: balance;
}

h1 { font-size: var(--step-6); }
h2 { font-size: var(--step-5); }
h3 { font-size: var(--step-2); letter-spacing: var(--tracking-snug); line-height: var(--leading-snug); }
h4 { font-size: var(--step-1); letter-spacing: var(--tracking-snug); line-height: var(--leading-snug); }

p { text-wrap: pretty; }

.serif {
  font-family: var(--font-serif);
  font-weight: 400;
  font-style: italic;
  letter-spacing: -0.01em;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--accent-ink);
}

.lede {
  font-size: var(--step-1);
  line-height: 1.5;
  letter-spacing: var(--tracking-snug);
  color: var(--ink-mute);
  max-width: 44ch;
}

.muted { color: var(--ink-mute); }

.num {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

/* ---- Layout primitives -------------------------------------- */
.shell {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.shell--narrow { max-width: calc(var(--max-content) + var(--gutter) * 2); }

.section {
  position: relative;
  padding-block: var(--space-3xl);
}

.section--tight { padding-block: var(--space-2xl); }

.section-head {
  display: grid;
  gap: var(--space-m);
  grid-template-columns: 1fr;
  align-items: end;
  margin-bottom: clamp(2.5rem, 1.5rem + 3vw, 4.5rem);
}

@media (min-width: 900px) {
  .section-head {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: var(--space-xl);
  }
  .section-head__aside { padding-bottom: 0.5rem; }
}

.section-head__title { font-size: var(--step-4); max-width: 18ch; }
.section-head__title .serif { display: inline; }
.section-head__aside p { color: var(--ink-mute); max-width: 42ch; }

.rule {
  height: 1px;
  background: var(--line);
  border: 0;
  width: 100%;
}

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

.stack > * + * { margin-top: var(--flow, var(--space-s)); }

/* ---- Scroll reveal ------------------------------------------ */
/* Hidden only when JS is available, so content is never lost. */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--dur-reveal) var(--ease-out),
    transform var(--dur-reveal) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  will-change: auto;
}

/* Line-by-line reveal for headline masks */
.js [data-reveal-lines] .line-inner {
  display: block;
  transform: translateY(105%);
  transition: transform var(--dur-reveal) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
.js [data-reveal-lines].is-revealed .line-inner { transform: none; }
.line-mask { display: block; overflow: hidden; padding-bottom: 0.08em; margin-bottom: -0.08em; }

@media (prefers-reduced-motion: reduce) {
  .js [data-reveal] { opacity: 1; transform: none; }
  .js [data-reveal-lines] .line-inner { transform: none; }
}


/* ---- Cross-document view transitions -------------------------
   Moving between the fifteen pages cross-fades instead of flashing
   white. Progressive enhancement: browsers without support simply
   navigate as before. */
@view-transition { navigation: auto; }

::view-transition-old(root) {
  animation: vt-out 200ms var(--ease-soft) both;
}
::view-transition-new(root) {
  animation: vt-in 320ms var(--ease-out) both;
}
@keyframes vt-out { to { opacity: 0; } }
@keyframes vt-in { from { opacity: 0; transform: translateY(8px); } }

@media (prefers-reduced-motion: reduce) {
  @view-transition { navigation: none; }
}