/* ============================================================
   base.css
   --------
   Foundation rules: accessibility (skip-link, focus-visible,
   reduced-motion), typography, layout container, section
   variants, primary navigation.

   Loads after tokens.css and before components.css.
   ============================================================ */

/* --- Accessibility --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
}
.skip-link {
  position: absolute; top: -100px; left: 16px; z-index: 9999;
  background: var(--gold); color: var(--teal-deeper);
  padding: 8px 16px; border-radius: 6px;
  font: 700 0.875rem var(--font-body);
}
.skip-link:focus { top: 16px; }
.section--dark *:focus-visible,
.section--teal *:focus-visible,
.section--danger *:focus-visible,
.sidebar *:focus-visible,
.hero *:focus-visible {
  outline-color: var(--gold-light);
}
/* Default focus indicator uses --gold-dark for >=3:1 contrast on light surfaces.
   Dark/teal/danger sections + sidebar override to --gold-light for visibility on dark.
   See audit H2 (WCAG SC 2.4.13 Focus Appearance). */
*:focus-visible {
  outline: 3px solid var(--gold-dark);
  outline-offset: 3px;
}

/* --- Typography --- */
body {
  font-family: var(--font-body);
  font-size: 1rem; line-height: 1.65;
  color: var(--text);
  background: var(--surface);
}
h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 600; line-height: 1.15; }
h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.125rem; }

.label {
  font-family: var(--font-body);
  font-size: 0.75rem; font-weight: 400;
  text-transform: uppercase; letter-spacing: 0.18em;
  color: var(--gold);
}
.section--dark .label { color: var(--gold-light); }

/* --- Layout --- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 64px);
}

/* --- Sections --- */
.section {
  padding: var(--section-pad) 0;
  position: relative;
  overflow: hidden;
}
.section--dark {
  background: var(--teal-deeper);
  color: var(--text-inverse);
}
.section--dark h2, .section--dark h3, .section--dark h4 { color: #FFF; }
.section--dark p { color: rgba(255,255,255,0.82); }
.section--teal {
  background: linear-gradient(160deg, var(--teal-deeper) 0%, var(--teal-dark) 100%);
  color: var(--text-inverse);
}
.section--teal h2, .section--teal h3 { color: #FFF; }
.section--teal p { color: rgba(255,255,255,0.82); }

/* Gold divider between sections */
.section--dark + .section:not(.section--dark)::before,
.section:not(.section--dark) + .section--dark::before,
.section--teal + .section:not(.section--teal)::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 5%, var(--gold) 50%, transparent 95%);
  opacity: 0.4;
}

/* --- Nav --- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 16px 0;
  transition: background 0.4s ease, padding 0.4s ease, box-shadow 0.4s ease;
}
.nav--solid {
  background: rgba(10, 31, 28, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 10px 0;
  box-shadow: 0 1px 0 rgba(212,168,75,0.15);
}
.nav__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 64px);
  display: flex; align-items: center; gap: 32px;
}
.nav__logo { height: 28px; width: auto; transition: opacity 0.3s ease; }
.nav__logo:hover { opacity: 0.8; }
.nav__links {
  display: flex; gap: 28px; margin-left: auto;
}
.nav__link {
  font-size: 0.8125rem; letter-spacing: 0.04em;
  color: var(--text-secondary);
  transition: color 0.3s ease;
  position: relative;
}
.nav--solid .nav__link {
  color: rgba(255,255,255,0.65);
}
.nav__link:hover, .nav__link--active { color: var(--gold); }
.nav__link::after {
  content: ''; position: absolute; bottom: -4px; left: 0;
  width: 0; height: 1px; background: var(--gold);
  transition: width 0.3s var(--ease-out);
}
.nav__link:hover::after, .nav__link--active::after { width: 100%; }

/* Progress bar */
.nav__progress {
  position: absolute; bottom: 0; left: 0;
  height: 2px; background: var(--gold);
  transition: width 0.15s linear;
  width: 0;
}

@media (max-width: 640px) {
  .nav__links { display: none; }
}