/* Base reset, typography, utilities */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

@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;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  color: var(--fg);
  background: var(--bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color var(--dur-fast) var(--ease-soft),
    opacity var(--dur-fast) var(--ease-soft);
}

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

:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -100px;
  z-index: 1000;
  padding: 0.65rem 1rem;
  background: var(--color-burgundy);
  color: var(--color-ivory);
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  text-decoration: none;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: 0.75rem;
}

/* Thai language body rhythm */
html[lang="th"] body {
  line-height: 1.85;
  letter-spacing: 0.01em;
}

html[lang="th"] .display,
html[lang="th"] .display-lg,
html[lang="th"] h1,
html[lang="th"] h2 {
  letter-spacing: 0;
  line-height: 1.2;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 400;
  line-height: var(--lh-snug);
}

p {
  margin: 0 0 1em;
}

p:last-child {
  margin-bottom: 0;
}

em {
  font-style: italic;
}

.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;
}

.container {
  width: min(100% - (var(--gutter) * 2), var(--content-max));
  margin-inline: auto;
}

.container--wide {
  width: min(100% - (var(--gutter) * 2), var(--wide-max));
}

.container--narrow {
  width: min(100% - (var(--gutter) * 2), var(--narrow-max));
}

.meta {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  color: var(--fg-muted);
}

.display {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
  font-weight: 400;
}

.display-lg {
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  line-height: var(--lh-tight);
  letter-spacing: -0.03em;
  font-weight: 400;
}

.display-hero {
  font-family: var(--font-display);
  font-size: var(--fs-hero);
  line-height: 0.92;
  letter-spacing: -0.035em;
  font-weight: 400;
}

.lede {
  font-family: var(--font-serif);
  font-size: var(--fs-md);
  line-height: var(--lh-body);
  color: var(--fg-muted);
}

.rule {
  border: 0;
  height: 1px;
  background: var(--color-rule);
  margin: var(--space-6) 0;
}

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

.section--dark {
  background: var(--color-void);
  color: var(--color-cream-soft);
  --fg: var(--color-cream-soft);
  --fg-muted: var(--color-fog);
  --bg: var(--color-void);
  --accent: var(--color-amber);
  --color-rule: rgba(232, 223, 208, 0.12);
}

.section--cream {
  background: var(--color-ivory);
  color: var(--color-ink);
}

.section--parchment {
  background: var(--color-parchment);
  color: var(--color-ink);
}

.section--smoke {
  background: var(--color-smoke);
  color: var(--color-cream-soft);
  --fg: var(--color-cream-soft);
  --fg-muted: var(--color-fog);
  --accent: var(--color-amber);
  --color-rule: rgba(232, 223, 208, 0.12);
}

.section-head {
  display: grid;
  gap: var(--space-4);
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
  max-width: 48rem;
}

.section-head .display {
  max-width: 18ch;
}

.section-index {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.section-index::after {
  content: "";
  width: 2.5rem;
  height: 1px;
  background: currentColor;
  opacity: 0.35;
}

/* Reveal helpers (enhanced by motion.js) */
.reveal {
  opacity: 1;
  transform: none;
}

.js-enabled .reveal {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
}

.js-enabled .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .js-enabled .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}