/* ==========================================================================
   base.css: tokens, reset, and the typographic primitives shared by the
   pages and the detail sheet.
   ========================================================================== */

:root {
  color-scheme: light;

  /* Ink ------------------------------------------------------------------ */
  /*
   * Graphite palette: neutral greys instead of the warm ink/accent, chosen
   * to clear WCAG AA (4.5:1) at 11–12px, the smallest type carrying the
   * lightest colour.
   */
  --ink: #111214;
  --ink-soft: #43464a;
  --muted: #6e7276;
  --faint: #a3a6aa;
  --accent: #33383d;

  /* Ground --------------------------------------------------------------- */
  --bg: #ffffff;
  --surface: #fafafa;
  --surface-2: #ececed;
  --hairline: #ebebeb;
  --rule: #e7e7e7;
  --edge: #dbdbdb;
  --veil: rgba(17, 18, 20, 0.4);

  --shadow-rest: 0 1px 4px rgba(20, 23, 28, 0.06);
  --shadow-card: 0 10px 26px rgba(20, 23, 28, 0.09);
  --shadow-lift: 0 14px 34px rgba(17, 18, 20, 0.1);
  --shadow-sheet: 0 40px 110px rgba(0, 0, 0, 0.4);

  /* Type ----------------------------------------------------------------- */
  --serif: "EB Garamond", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* Every fluid size keeps a rem term so browser zoom still moves it. */
  --fs-hero: clamp(2.5rem, 1.6rem + 4.5vw, 4rem);
  --fs-page: clamp(2.25rem, 1.5rem + 3.5vw, 3.75rem);
  --fs-sheet: clamp(1.75rem, 1.2rem + 2.4vw, 2.75rem);
  --fs-headline: clamp(1.5rem, 1.15rem + 1.5vw, 2rem);
  --fs-title: clamp(1.25rem, 1.05rem + 0.9vw, 1.6875rem);
  --fs-row: clamp(1.1875rem, 1.05rem + 0.55vw, 1.4375rem);
  --fs-lede: clamp(1.1875rem, 1rem + 0.9vw, 1.5rem);
  --fs-sub: clamp(1.0625rem, 0.95rem + 0.6vw, 1.25rem);
  --fs-body: clamp(1.0625rem, 1rem + 0.3vw, 1.1875rem);
  --fs-small: 0.75rem;
  --fs-meta: 0.71875rem;
  --fs-eyebrow: 0.6875rem;

  --tracking: 0.24em;
  --tracking-tight: 0.2em;

  /* Space ---------------------------------------------------------------- */
  /* The `env()` terms keep content clear of a display cutout in landscape;
     they resolve to 0 everywhere else, so `max()` leaves the clamp alone. */
  --gutter: max(clamp(1.25rem, 5vw, 5.625rem), env(safe-area-inset-left), env(safe-area-inset-right));
  --sheet-pad: max(clamp(1.25rem, 4vw, 3rem), env(safe-area-inset-left), env(safe-area-inset-right));
  --measure: 41.25rem;
  --reading: 43.75rem;
  --wide: 58.75rem;
}

/* Reset -------------------------------------------------------------------- */

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 1rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

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

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

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

button {
  font: inherit;
  color: inherit;
}

cite {
  font-style: normal;
}

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

/* Typographic primitives --------------------------------------------------- */

.eyebrow {
  margin: 0;
  font-family: var(--mono);
  font-size: var(--fs-eyebrow);
  font-weight: 400;
  letter-spacing: var(--tracking-tight);
  text-transform: uppercase;
  color: var(--faint);
}

.eyebrow--rule {
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
}

.section-label {
  margin: 0 0 0.875rem;
  font-family: var(--mono);
  font-size: var(--fs-eyebrow);
  font-weight: 400;
  letter-spacing: var(--tracking);
  text-transform: uppercase;
  color: var(--faint);
  text-align: center;
}

.more-link {
  display: block;
  margin-top: 0.875rem;
  padding: 0.875rem 0;
  font-size: 0.71875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.more-link:hover,
.more-link:focus-visible {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Tag chips ---------------------------------------------------------------- */

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4375rem;
  margin-bottom: 1.375rem;
}

.tags__tag {
  border: 1px solid var(--edge);
  padding: 0.25rem 0.5625rem;
  font-size: var(--fs-eyebrow);
  color: var(--ink-soft);
}

/* Prose -------------------------------------------------------------------- */

.prose__p {
  font-family: var(--serif);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--ink-soft);
  text-wrap: pretty;
}

.plain-list {
  font-size: var(--fs-small);
  line-height: 1.95;
  color: var(--ink-soft);
}

/* Accessibility helpers ---------------------------------------------------- */

.skip-link {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 200;
  padding: 0.625rem 1rem;
  background: var(--ink);
  color: var(--bg);
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transform: translateY(-200%);
}

.skip-link:focus-visible {
  transform: none;
}

/* Motion ------------------------------------------------------------------- */

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
}

@keyframes veil-in {
  from {
    opacity: 0;
  }
}

@keyframes sheet-in {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.99);
  }
}

@keyframes sheet-up {
  from {
    transform: translateY(6%);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}