/* ============================================================
   Base — reset, typography, layout primitives, a11y, motion
   ============================================================ */
*, *::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 {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, picture, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-bright); }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; }
ul, ol { list-style: none; padding: 0; }

/* ---- Headings ---- */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  color: var(--heading);
  line-height: var(--lh-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); font-weight: 700; letter-spacing: -0.01em; }
p { text-wrap: pretty; }

/* ---- Layout ---- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--wide { max-width: var(--maxw-wide); }
.container--narrow { max-width: var(--maxw-narrow); }

.section { padding-block: var(--section-y); }
.section--tight { padding-block: clamp(2.5rem, 5vw, 4.5rem); }
.section--mist { background: var(--mist); }
.section--ink { background: var(--ink-800); color: var(--on-dark); }
.section--ink h1, .section--ink h2, .section--ink h3 { color: #fff; }

/* ---- Shared bits ---- */
.eyebrow {
  display: inline-flex; align-items: center; gap: .55rem;
  font-family: var(--font-head);
  font-size: var(--fs-eyebrow);
  font-weight: 700;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--steel-600); /* AA on white (5.8:1) */
  margin-bottom: var(--space-4);
}
.eyebrow::before {
  content: ""; width: 26px; height: 2px; background: var(--accent); border-radius: 2px;
}
.section--ink .eyebrow, .eyebrow--ondark { color: var(--safety-400); }
.lead { font-size: var(--fs-lead); line-height: 1.55; color: var(--muted); }
.section--ink .lead { color: var(--on-dark-muted); }

.section-head { max-width: 720px; margin-bottom: clamp(2rem, 4vw, 3.25rem); }
.section-head--center { margin-inline: auto; text-align: center; }
.text-accent { color: var(--brand-bright); }

/* ---- Accessibility ---- */
.skip-link {
  position: fixed; top: -100px; left: 12px; z-index: 200;
  background: var(--ink-900); color: #fff; padding: .7rem 1.1rem; border-radius: var(--r-sm);
  font-weight: 600;
}
.skip-link:focus { top: 12px; color: #fff; }

:focus-visible {
  outline: 3px solid var(--steel-600); /* AA non-text contrast on both light (5.8:1) and dark (3.4:1) */
  outline-offset: 2px;
  border-radius: 3px;
}
.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;
}

/* ---- Scroll-reveal (GPU transforms only; only active when JS is present,
   so no-JS users always see content) ---- */
.js .reveal {
  opacity: 0;
  transform: translate3d(0, 22px, 0);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
  will-change: opacity, transform;
}
.js .reveal.is-visible { opacity: 1; transform: none; will-change: auto; }
.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }
.reveal[data-delay="4"] { transition-delay: .32s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---- Utilities ---- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.stack > * + * { margin-top: var(--space-4); }
.stack-lg > * + * { margin-top: var(--space-6); }
.grid { display: grid; gap: clamp(1rem, 2vw, 1.6rem); }
[hidden] { display: none !important; }