/* ==========================================================================
   Base — reset, document defaults, typography, layout primitives, a11y
   ========================================================================== */

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

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px; /* sticky header offset for anchor jumps */
  overflow-x: clip; /* contain the off-canvas mobile nav (fixed elems escape body overflow) */
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

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

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

input, button, textarea, select { font: inherit; color: inherit; }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}
a:hover { color: var(--color-primary-dark); }

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

/* --- Headings --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-heading);
  line-height: var(--lh-snug);
  font-weight: 800;
  letter-spacing: var(--ls-tight);
  text-wrap: balance;
}
h1 { font-size: var(--fs-4xl); line-height: var(--lh-tight); }
h2 { font-size: var(--fs-3xl); }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-lg); }

p { text-wrap: pretty; }

strong, b { font-weight: 700; color: var(--color-heading); }

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

.section { padding-block: var(--section-y); }
.section--sm { padding-block: var(--section-y-sm); }
.section--tight-top { padding-top: var(--section-y-sm); }

/* Dark / ink section */
.section--ink {
  background: var(--color-ink);
  color: var(--color-text-invert);
  position: relative;
}
.section--ink h1, .section--ink h2, .section--ink h3, .section--ink h4 {
  color: #fff;
}
.section--ink p { color: var(--color-text-invert-muted); }

/* Alt (tinted) section */
.section--alt { background: var(--color-surface-alt); }
.section--sand { background: var(--sand-100); }

/* --- Section header block --- */
.section-head {
  max-width: 720px;
  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-display);
  font-weight: 700;
  font-size: var(--fs-eyebrow);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--color-accent);
  display: inline-block;
}
.eyebrow--center { justify-content: center; }
.section-head .lead { margin-top: var(--space-3); }

.lead {
  font-size: var(--fs-lg);
  color: var(--color-text-muted);
  line-height: 1.55;
}
.section--ink .lead { color: var(--color-text-invert-muted); }

/* --- Utility --- */
.text-center { text-align: center; }
.text-accent { color: var(--color-accent); }
.text-primary { color: var(--color-primary); }
.nowrap { white-space: nowrap; }
.mt-0 { margin-top: 0; }
.hidden { display: none !important; }

/* --- Accessibility --- */
.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;
}

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

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  z-index: var(--z-modal);
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-3) var(--space-5);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 700;
  transition: top var(--t-fast) var(--ease);
}
.skip-link:focus { top: 0; color: #fff; }

/* --- Reveal-on-scroll (progressive enhancement; visible without JS) --- */
[data-reveal] {
  opacity: 1;
  transform: none;
}
.js [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
  will-change: opacity, transform;
}
.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .js [data-reveal] { opacity: 1 !important; transform: none !important; transition: none; }
}