/* ==========================================================================
   base.css — Reset, document defaults, base typography.
   Loaded after tokens.css, before layout/components.
   ========================================================================== */

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

* { margin: 0; }

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

body {
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Headings use the display face with tight, engineered tracking */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-wrap: balance;
}
h1 { font-size: var(--step-5); }
h2 { font-size: var(--step-4); }
h3 { font-size: var(--step-2); }
h4 { font-size: var(--step-1); }

p { text-wrap: pretty; }

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

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

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

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

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

/* Monospace utility for telemetry / data labels */
.mono {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.04em;
}

/* Eyebrow label — a structural device, set in mono caps */
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand);
}

/* --- Accessibility floor ------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: var(--space-s);
  top: -100%;
  z-index: 999;
  padding: var(--space-2xs) var(--space-s);
  background: var(--ink);
  color: var(--mist);
  border-radius: var(--radius-s);
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: var(--space-s); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

@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;
  }
}