/* ==========================================================================
   Astratech Solutions — Base
   Reset, element defaults, typography primitives. No layout, no components.
   ========================================================================== */

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

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

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

body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  font-weight: var(--weight-regular);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

/* The rule above would otherwise override the hidden attribute on an <svg>
   — the footer's icon sprite is one — and paint an empty 300x150 box. */
[hidden] { display: none !important; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  margin: 0;
  /* colour inherits from context (body sets the light-surface default;
     dark sections like .hero override it) so headings stay legible on
     both light and dark backgrounds without per-component overrides */
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-md); }

p { margin: 0; }

a {
  color: inherit;
  text-decoration-color: var(--color-accent-500);
  text-underline-offset: 0.2em;
}

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
}

button { cursor: pointer; }

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

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

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: var(--z-skip-link);
  background: var(--color-ink-900);
  color: var(--color-ground-100);
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  transition: top var(--duration-fast) var(--ease-standard);
}

.skip-link:focus {
  top: var(--space-4);
}

.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;
}

/* -- Selection -------------------------------------------------------------*/

::selection {
  background: var(--color-accent-500);
  color: var(--color-ground-000);
}