/* ============================================
   Elegant Stone — Base Styles & Theme Logic
   ============================================ */

/* ── Theme Transition ─────────────────────── */

html {
  color-scheme: dark;
}

html[data-theme="light"] {
  color-scheme: light;
}

/* Scoped theme transition — only on elements that declare theme-aware colors */
html.es-theme-transitioning {
  transition:
    background-color var(--duration-medium) var(--ease-standard),
    color var(--duration-medium) var(--ease-standard);
}

html.es-theme-transitioning body,
html.es-theme-transitioning .es-nav,
html.es-theme-transitioning .es-footer,
html.es-theme-transitioning .es-section,
html.es-theme-transitioning .es-section--alt,
html.es-theme-transitioning .es-category-card__overlay,
html.es-theme-transitioning .es-experience-card,
html.es-theme-transitioning .es-btn {
  transition:
    background-color var(--duration-medium) var(--ease-standard),
    color var(--duration-medium) var(--ease-standard),
    border-color var(--duration-medium) var(--ease-standard),
    box-shadow var(--duration-medium) var(--ease-standard);
}

/* ── Body ─────────────────────────────────── */

body {
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
}

/* Subtle noise texture — decorative layer below all interactive UI */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

/* ── Main Content ─────────────────────────── */

main {
  min-height: 100vh;
}

/* ── Typography Defaults ──────────────────── */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
}

h1 { font-size: var(--text-display-lg); }
h2 { font-size: var(--text-display-sm); }
h3 { font-size: var(--text-headline-lg); }
h4 { font-size: var(--text-headline-sm); }
h5 { font-size: var(--text-title-lg); }
h6 { font-size: var(--text-title-md); }

p {
  font-size: var(--text-body-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

strong {
  font-weight: 600;
}

/* ── Links ────────────────────────────────── */

a {
  transition: color var(--duration-micro) var(--ease-standard);
}

a:hover {
  color: var(--color-gold);
}

/* ── Selection ────────────────────────────── */

::selection {
  background-color: var(--color-gold);
  color: var(--color-text-inverse);
}

/* ── Scrollbar ────────────────────────────── */

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gold-dim);
}

/* ── Skip Link (Accessibility) ────────────── */

.es-skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 10000;
  padding: var(--space-3) var(--space-6);
  background: var(--color-gold);
  color: var(--color-text-inverse);
  font-family: var(--font-body);
  font-size: var(--text-label-lg);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  transition: top var(--duration-short) var(--ease-standard);
}

.es-skip-link:focus {
  top: 0;
}

/* ── Scroll Reveal Animation Base ─────────── */

.es-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity var(--duration-long) var(--ease-decelerate),
    transform var(--duration-long) var(--ease-decelerate);
}

.es-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.es-reveal--delay-1 { transition-delay: 100ms; }
.es-reveal--delay-2 { transition-delay: 200ms; }
.es-reveal--delay-3 { transition-delay: 300ms; }
.es-reveal--delay-4 { transition-delay: 400ms; }
.es-reveal--delay-5 { transition-delay: 500ms; }

/* ── Decorative Gold Line ─────────────────── */

.es-gold-line {
  display: block;
  width: 60px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
  margin: var(--space-4) auto;
}

.es-gold-line--left {
  margin-left: 0;
  background: linear-gradient(90deg, var(--color-gold), transparent);
}