/* ==========================================================================
   BASE LAYER — reset, element defaults, layout primitives, accessibility
   Loaded after variables.css.
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px; /* offset for fixed header anchor jumps */
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }

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

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

/* ---- Headings --------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  line-height: var(--lh-heading);
  letter-spacing: var(--tracking-tight);
  color: var(--fg);
  text-wrap: balance;
}

h1 { font-size: var(--fs-h1); font-weight: var(--fw-heavy); line-height: var(--lh-tight); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); letter-spacing: var(--tracking-normal); }

p { text-wrap: pretty; }

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

.section { padding-block: var(--section-y); position: relative; }

/* Dark-context sections: flip semantic tokens locally */
.on-dark {
  --bg: var(--dark-bg);
  --surface: var(--dark-surface);
  --fg: var(--dark-fg);
  --fg-muted: var(--dark-fg-muted);
  --border: var(--dark-border);
  --primary: var(--gold-500);
  --primary-fg: var(--navy-900);
  background: var(--dark-bg);
  color: var(--dark-fg);
}
.on-dark h1, .on-dark h2, .on-dark h3, .on-dark h4 { color: var(--dark-fg); }

/* ---- Section header pattern (eyebrow + title + intro) ----------------- */
.section-head { max-width: 56ch; margin-bottom: var(--space-7); }
.section-head--center { margin-inline: auto; text-align: center; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-alt);
  font-size: var(--fs-eyebrow);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--accent-strong);
  margin-bottom: var(--space-4);
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--accent);
}
.section-head--center .eyebrow { justify-content: center; }

.section-intro {
  margin-top: var(--space-4);
  color: var(--fg-muted);
  font-size: var(--fs-lead);
  line-height: var(--lh-snug);
  max-width: 60ch;
}
.section-head--center .section-intro { margin-inline: auto; }

/* ---- Utilities -------------------------------------------------------- */
.text-accent { color: var(--accent-strong); }
.text-muted  { color: var(--fg-muted); }

.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;
}

/* ---- Accessibility ---------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -120px;
  z-index: var(--z-modal);
  background: var(--navy-800);
  color: var(--white);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius);
  transition: top var(--dur) var(--ease-out);
}
.skip-link:focus { top: var(--space-4); }

/* ---- Reveal-on-scroll base state (JS adds .is-in) --------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
  will-change: opacity, transform;
}
[data-reveal].is-in { opacity: 1; transform: none; }

/* ---- Reduced motion --------------------------------------------------- */
@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;
  }
  [data-reveal] { opacity: 1; transform: none; }
}