/* ============================================================================
   Reset, typography scale, layout primitives, motion
   ============================================================================ */

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

* { margin: 0; padding: 0; }

html {
  background: var(--bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  min-height: 100svh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.4s var(--ease), color 0.4s var(--ease);
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

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

ul, ol { list-style: none; }

::selection { background: var(--accent); color: var(--accent-ink); }

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

.skip-link {
  position: absolute;
  left: 16px;
  top: -100px;
  z-index: 999;
  padding: 12px 20px;
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border-radius: var(--radius);
  transition: top 0.25s var(--ease);
}
.skip-link:focus { top: 16px; }

/* Utility — must beat component rules like `.field select { width: 100% }`. */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  margin: -1px !important;
  padding: 0 !important;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ============================================================================
   Type system
   ============================================================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--display-weight, 400);
  letter-spacing: var(--display-tracking, -0.02em);
  line-height: 1.05;
  text-wrap: balance;
}

.h-display {
  font-family: var(--font-display);
  font-weight: var(--display-weight, 400);
  font-size: calc(clamp(56px, 13vw, 220px) * var(--display-scale, 1));
  letter-spacing: -0.04em;
  line-height: 0.86;
}

.h-section {
  font-family: var(--font-display);
  font-weight: var(--display-weight, 400);
  font-size: calc(clamp(38px, 6.5vw, 104px) * var(--display-scale, 1));
  letter-spacing: -0.03em;
  line-height: 0.95;
}

.h-page {
  font-family: var(--font-display);
  font-weight: var(--display-weight, 400);
  font-size: calc(clamp(52px, 10.5vw, 168px) * var(--display-scale, 1));
  letter-spacing: -0.04em;
  line-height: 0.9;
}

.h-card {
  font-family: var(--font-display);
  font-weight: var(--display-weight, 400);
  font-size: calc(clamp(24px, 2.6vw, 38px) * var(--display-scale, 1));
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.italic, em.italic { font-style: italic; }
.accent { color: var(--accent); }
.accent-italic { color: var(--accent); font-style: italic; }

/* Outline display text — the "ghost" treatment from the source design. */
.outline {
  color: transparent;
  -webkit-text-stroke: 1.2px var(--fg);
  paint-order: stroke fill;
}

.lede {
  font-size: clamp(16px, 1.3vw, 21px);
  line-height: 1.55;
  color: var(--fg-dim);
  max-width: 58ch;
  text-wrap: pretty;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-faint);
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
  flex: none;
}

.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-faint);
}

/* ============================================================================
   Layout
   ============================================================================ */

.section {
  position: relative;
  padding: clamp(72px, 12vw, 172px) var(--gutter);
}
.section--tight { padding-block: clamp(48px, 7vw, 96px); }
.section--sunken { background: var(--bg-2); }

.container { max-width: var(--maxw); margin-inline: auto; }
.container--prose { max-width: var(--maxw-prose); }

.section-head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: end;
  gap: 32px;
  padding-bottom: 32px;
  margin-bottom: clamp(40px, 6vw, 64px);
  border-bottom: 1px solid var(--line);
}
.section-head .num,
.section-head .label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-faint);
  white-space: nowrap;
}
.section-head .label { justify-self: end; color: var(--fg-dim); }
a.label:hover { color: var(--accent); }

@media (max-width: 760px) {
  .section-head {
    grid-template-columns: 1fr;
    gap: 14px;
    align-items: start;
  }
  .section-head .label { justify-self: start; }
}

/* Page hero shared by every inner page */
.page-hero {
  padding: clamp(56px, 9vw, 120px) var(--gutter) clamp(40px, 6vw, 72px);
}
.page-hero__title { margin-top: 24px; }
.page-hero__meta {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 32px;
  flex-wrap: wrap;
  margin-top: clamp(32px, 4vw, 56px);
}

/* ============================================================================
   Motion
   ============================================================================ */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.9s var(--ease) var(--reveal-delay, 0s),
    transform 0.9s var(--ease) var(--reveal-delay, 0s);
}
.reveal.is-in { opacity: 1; transform: none; }

.d1 { --reveal-delay: 0.08s; }
.d2 { --reveal-delay: 0.16s; }
.d3 { --reveal-delay: 0.24s; }
.d4 { --reveal-delay: 0.32s; }
.d5 { --reveal-delay: 0.40s; }

/* Masked line-by-line reveal for display headings */
.mask {
  display: block;
  overflow: hidden;
  padding-bottom: 0.08em;
  margin-bottom: -0.08em;
}
.mask > span {
  display: block;
  transform: translateY(110%);
  transition: transform 1s var(--ease-out) var(--reveal-delay, 0s);
}
.mask.is-in > span { transform: none; }

.mask--inline { display: inline-block; vertical-align: bottom; }
.mask--inline > span { display: inline-block; }

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(1.35); }
}

@keyframes marquee { to { transform: translateX(-50%); } }

@keyframes ring-pulse {
  0%   { transform: scale(1); opacity: 0.5; }
  100% { transform: scale(1.45); opacity: 0; }
}

@keyframes spin { to { transform: rotate(360deg); } }

/* Cross-document + Turbo view transitions */
@view-transition { navigation: auto; }
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 260ms;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}
::view-transition-old(root) { animation-name: vt-out; }
::view-transition-new(root) { animation-name: vt-in; }
@keyframes vt-out { to { opacity: 0; transform: translateY(-4px); } }
@keyframes vt-in { from { opacity: 0; transform: translateY(6px); } }

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal { opacity: 1; transform: none; }
  .mask > span { transform: none; }
  .marquee__track { animation: none; }
  ::view-transition-old(root), ::view-transition-new(root) { animation: none; }
}