/* ============================================================
   Ops Singularity - Base layer
   Reset + typography + container primitives.
   Loaded after tokens.css, before components.css.
   ============================================================ */

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

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

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  color: var(--text);
  background: var(--surface);
  line-height: var(--lh-relaxed);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

::selection {
  background: var(--teal);
  color: var(--white);
}

/* Accessibility: visible keyboard focus everywhere */
:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}

/* ── Display headings use Plus Jakarta Sans ────────────── */
.hero-h1, .section-title, h1.display, h2.display {
  font-family: var(--font-display);
}

/* ── Container ─────────────────────────────────────────── */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.container-wide { max-width: var(--container-wide); margin: 0 auto; padding: 0 var(--gutter); }
.container-text { max-width: var(--container-text); margin: 0 auto; padding: 0 var(--gutter); }

/* ── Section primitives ────────────────────────────────── */
.section          { padding: var(--section-y) 0; }
.section-sm       { padding: var(--section-y-sm) 0; }
.section-lg       { padding: var(--section-y-lg) 0; }
.section-subtle   { background: var(--surface-subtle); }
.section-sunken   { background: var(--surface-sunken); }
.section-dark     { background: var(--surface-dark); color: var(--text-onDark); }
.section-darker   { background: var(--surface-darker); color: var(--text-onDark); }

.section-eyebrow {
  font-size: var(--fs-eyebrow);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--blue);
  margin-bottom: var(--space-3);
}
.section-title {
  font-size: var(--fs-h2);
  font-weight: var(--weight-black);
  color: var(--navy);
  line-height: var(--lh-snug);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-4);
}
.section-dark .section-title,
.section-darker .section-title { color: var(--white); }
.section-sub {
  font-size: var(--fs-body-lg);
  color: var(--text-light);
  line-height: var(--lh-relaxed);
  max-width: 640px;
}
.section-dark .section-sub,
.section-darker .section-sub { color: var(--text-onDark-muted); }

.section-center { text-align: center; }
.section-center .section-sub { margin-left: auto; margin-right: auto; }

/* ── Stack & cluster utilities ─────────────────────────── */
.stack-2 > * + * { margin-top: var(--space-2); }
.stack-3 > * + * { margin-top: var(--space-3); }
.stack-4 > * + * { margin-top: var(--space-4); }
.stack-6 > * + * { margin-top: var(--space-6); }
.stack-8 > * + * { margin-top: var(--space-8); }

/* ── Scroll-reveal utility (driven by include.js) ──────── */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Visually hidden (a11y) ────────────────────────────── */
.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;
}