/* ==========================================================================
   BASE — reset, typography, global utility surfaces
   ========================================================================== */

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

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

@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;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--text-primary);
  background: var(--bg-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; cursor: pointer; }
input, textarea, select { font: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: var(--lh-tight);
  margin: 0;
  letter-spacing: -0.01em;
}

p { margin: 0; }

/* ---- Skip link (a11y) ---- */
.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  background: var(--navy-900);
  color: #fff;
  padding: 0.75rem 1.25rem;
  z-index: 999;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus {
  left: 0;
  top: 0;
}

/* ---- Visible keyboard focus everywhere ---- */
:focus-visible {
  outline: 2px solid var(--blue-400);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---- Container ---- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* ---- Blueprint grid texture (signature ambient background) ---- */
.blueprint-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(127, 176, 255, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(127, 176, 255, 0.09) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 40%, transparent 90%);
}

.blueprint-grid--light {
  background-image:
    linear-gradient(rgba(22, 51, 111, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22, 51, 111, 0.06) 1px, transparent 1px);
}

/* ---- Utility ---- */
.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;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blue-500);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
}

.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  background: var(--amber-500);
  display: inline-block;
}

.section-head {
  max-width: 640px;
  margin-bottom: var(--space-10);
}

.section-head--center {
  margin-inline: auto;
  text-align: center;
}

.section-title {
  font-size: var(--fs-3xl);
  font-weight: 700;
  margin-top: var(--space-3);
}

.section-sub {
  color: var(--text-secondary);
  font-size: var(--fs-md);
  margin-top: var(--space-4);
}

.text-on-dark .eyebrow { color: var(--blue-300); }
.text-on-dark .section-title { color: var(--text-on-dark); }
.text-on-dark .section-sub { color: var(--text-on-dark-muted); }