*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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;
  }
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-normal);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--gutter);
  z-index: 9999;
  padding: 0.75rem 1rem;
  background: var(--color-text);
  color: var(--color-bg);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
}

.skip-link:focus { top: 1rem; }

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: var(--max-width-narrow); }
.container--wide { max-width: var(--max-width-wide); }
.container--manifest { max-width: var(--max-width-manifest); }

.text-pretty { text-wrap: pretty; }
.text-balance { text-wrap: balance; }

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

.chapter--lg { padding-block: var(--section-y-lg); }

.chapter--dark {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
}

.chapter--warm {
  background: var(--color-bg-warm);
}

.chapter__index {
  display: block;
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
}

.chapter--dark .chapter__index {
  color: var(--color-text-on-dark-muted);
}

.chapter__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  max-width: 16ch;
}

.chapter--dark .chapter__title {
  color: var(--color-text-on-dark);
}

.statement {
  font-family: var(--font-display);
  font-size: var(--text-statement);
  font-weight: 500;
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-tight);
}

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

.chapter--dark .prose {
  color: var(--color-text-on-dark-muted);
}

.prose p + p { margin-top: 1.5rem; }

.prose--narrow { max-width: 36em; }

.divider {
  width: 100%;
  height: 1px;
  background: var(--color-border);
  border: none;
}

.chapter--dark .divider {
  background: var(--color-border-dark);
}