/* ============================================================
   DEAR Lab - Reset, typography, grain, utilities
   ============================================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-padding-top: var(--nav-h);
}

body {
  font-family: var(--font);
  font-weight: 400;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--text);
  background: var(--paper);
  overflow-x: hidden;
}

/* --- Grain over the whole page --- */
body::after {
  content: '';
  position: fixed;
  inset: -50%;
  z-index: 9999;
  pointer-events: none;
  background-image: var(--grain);
  background-repeat: repeat;
  opacity: 0.17;
  mix-blend-mode: multiply;
  animation: grainDrift 7s steps(6) infinite;
}

@keyframes grainDrift {
  0%   { transform: translate(0, 0); }
  17%  { transform: translate(-3%, -2%); }
  34%  { transform: translate(2%, -4%); }
  51%  { transform: translate(-2%, 3%); }
  68%  { transform: translate(3%, 2%); }
  85%  { transform: translate(-3%, 1%); }
  100% { transform: translate(0, 0); }
}

img, svg, video { display: block; max-width: 100%; height: auto; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; transition: color var(--t-fast); }

::selection { background: var(--teal); color: #fff; }
:focus-visible { outline: 2px solid var(--teal); outline-offset: 4px; }

/* --- Headings: uppercase, light weight, wide and calm --- */
h1, h2, h3, h4 {
  font-family: var(--font);
  font-weight: 400;
  line-height: var(--lh-snug);
  letter-spacing: var(--track-head);
  text-transform: uppercase;
  text-wrap: balance;
  color: var(--text);
}

h1 { font-size: var(--fs-h1); font-weight: 300; line-height: 1.1; }
h2 { font-size: var(--fs-h2); font-weight: 300; line-height: 1.15; }
h3 { font-size: var(--fs-h3); font-weight: 400; }
h4 { font-size: 0.95rem; font-weight: 500; }

/* Sentence-case escape hatch */
.h-sentence { text-transform: none; }

/* Keep gene, RNA and molecule names exactly as written */
.nom { text-transform: none; }

p { text-wrap: pretty; }
strong { font-weight: 600; color: var(--text); }

/* --- Monospace micro-type (nav, markers, captions) --- */
.mono {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--track-micro);
  text-transform: uppercase;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.7em;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: var(--track-micro);
  color: var(--teal);
  line-height: 1;
}

.eyebrow::before {
  content: '';
  width: 2.2em;
  height: 1px;
  background: currentColor;
  opacity: 0.55;
}

.eyebrow--bare::before { display: none; }

.marker {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--track-micro);
  text-transform: uppercase;
  color: var(--text-faint);
}

.lead {
  font-size: var(--fs-lead);
  line-height: 1.65;
  font-weight: 300;
  color: var(--text-mute);
  max-width: var(--measure);
  text-transform: none;
}

/* --- Utilities --- */
.measure     { max-width: var(--measure); }
.text-teal   { color: var(--teal); }
.text-violet { color: var(--violet); }
.text-mute   { color: var(--text-mute); }
.center      { text-align: center; }
.right       { text-align: right; }

.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;
}

.stack-sm > * + * { margin-top: var(--stack-sm); }
.stack-md > * + * { margin-top: var(--stack-md); }
.stack-lg > * + * { margin-top: var(--stack-lg); }

/* --- Dark surfaces invert the scale --- */
.on-dark,
.surface--ink,
.surface--deep {
  color: var(--on-ink);
}

.surface--ink h1, .surface--ink h2, .surface--ink h3, .surface--ink h4,
.surface--deep h1, .surface--deep h2, .surface--deep h3, .surface--deep h4 { color: var(--on-ink); }

.surface--ink .lead, .surface--ink .text-mute,
.surface--deep .lead, .surface--deep .text-mute { color: var(--on-ink-mute); }

.surface--ink .marker, .surface--deep .marker { color: var(--on-ink-faint); }
.surface--ink .eyebrow, .surface--deep .eyebrow { color: var(--teal-lift); }
.surface--ink strong, .surface--deep strong { color: var(--on-ink); }