/* ==========================================================================
   LYS — Base layer
   Reset-ish, element defaults, layout primitives, header/footer shell.
   Component styles live in /assets/css/components/*.
   ========================================================================== */

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

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

body {
  margin: 0;
  background: var(--c-ivory);
  color: var(--c-ink);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* --- Headings ---------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: var(--lh-heading);
  font-weight: 500;
  margin: 0 0 var(--space-2);
  color: var(--c-ink);
}
h1 { font-size: clamp(2.75rem, 4vw, var(--fs-3xl)); line-height: 1.0; letter-spacing: var(--tracking-h2); }
h2 { font-size: var(--fs-2xl); line-height: 1.02; letter-spacing: var(--tracking-h2); }
h3 { font-size: var(--fs-xl); line-height: 1.08; letter-spacing: var(--tracking-card); }
h4 { font-size: var(--fs-lg); line-height: 1.12; letter-spacing: var(--tracking-card); }

p { margin: 0 0 var(--space-2); }

a { color: var(--c-ink); text-decoration: none; transition: color var(--dur-fast) var(--ease); }
a:hover { color: var(--c-bronze); }

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

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

.l-prose {
  max-width: var(--prose-max);
  margin-inline: auto;
}

.l-section { padding-block: var(--space-8); }

/* --- Typographic utilities --------------------------------------------- */
.eyebrow {
  font-family: var(--font-label);
  font-size: var(--fs-2xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  color: var(--c-stone);
  font-weight: 600;
  margin: 0 0 var(--space-2);
}

.u-display { font-family: var(--font-display); }
.u-muted   { color: var(--c-stone); }

/* --- Skip link (a11y) -------------------------------------------------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--c-ink);
  color: var(--c-ivory);
  padding: var(--space-1) var(--space-2);
  z-index: var(--z-overlay);
}
.skip-link:focus { left: var(--space-2); top: var(--space-2); }

/* --- Site header ------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: color-mix(in srgb, var(--c-ivory) 92%, transparent);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: var(--hairline);
}
.site-header__row1 {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 88px;
}
.site-brand {
  font-family: var(--font-display);
  font-size: 1.625rem;       /* 26px — commanding masthead */
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--c-ink);
  white-space: nowrap;
}
.site-nav {
  border-top: var(--hairline);
  position: relative; /* positioning context for full-width mega panels */
}
.site-nav > .l-container > ul {
  display: flex;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 10px 0;
}
.site-nav__sep { margin-left: auto; }
.site-nav__sep a { color: var(--c-bronze); }
.site-nav > .l-container > ul > li > a {
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-nav);
  text-transform: uppercase;
  font-weight: 500;
  color: var(--c-graphite);
}
.site-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--fs-sm);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}
.site-actions a { color: var(--c-graphite); }

/* --- Site footer ------------------------------------------------------- */
.site-footer {
  border-top: var(--hairline);
  background: var(--c-bone);
  padding-block: var(--space-5) var(--space-4);
  margin-top: var(--space-7);
}
.site-footer__brand {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.site-footer__disclosure {
  font-size: var(--fs-sm);
  color: var(--c-stone);
  max-width: var(--prose-max);
  margin-top: var(--space-2);
}

@media (max-width: 768px) {
  .site-nav { display: none; } /* mobile nav deferred to Phase 1 */
}