/* ============================================================================
   Base: reset, document defaults, typography baseline, accessibility.
   ============================================================================ */

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.6;
  letter-spacing: var(--tracking-snug);
  font-weight: var(--fw-regular);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100dvh;
  transition: background var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out);
}

img, svg, video, canvas { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
:where(button) { cursor: pointer; background: none; border: none; }

/* ---- Type scale helpers ------------------------------------------------- */
.display-xl {
  font-size: var(--text-display-xl); font-weight: var(--fw-medium);
  line-height: 1.02; letter-spacing: var(--tracking-tight); text-wrap: balance;
}
.display-lg {
  font-size: var(--text-display-lg); font-weight: var(--fw-medium);
  line-height: 1.06; letter-spacing: var(--tracking-tight); text-wrap: balance;
}
.h3 { font-size: var(--text-h3); font-weight: var(--fw-semibold); line-height: 1.2;
      letter-spacing: -0.015em; }
.h4 { font-size: var(--text-h4); font-weight: var(--fw-semibold); line-height: 1.3; }
.lead { font-size: var(--text-body-lg); color: var(--text-muted); line-height: 1.55;
        text-wrap: pretty; }
.muted { color: var(--text-muted); }
.subtle { color: var(--text-subtle); }
.eyebrow {
  font-size: var(--text-eyebrow); font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-wide); text-transform: uppercase;
  color: var(--accent-300);
}
code, kbd, .mono { font-family: var(--font-mono); font-size: 0.9em; }

/* ---- Accessibility ------------------------------------------------------ */
:where(a, button, input, select, textarea, [tabindex]):focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--focus-ring);
  border-radius: var(--radius-xs);
}
.skip-link {
  position: absolute; left: var(--space-4); top: -64px; z-index: 100;
  background: var(--accent); color: var(--on-accent);
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-sm);
  transition: top var(--dur-base) var(--ease-out);
}
.skip-link:focus { top: var(--space-4); }

::selection { background: var(--accent-soft); }