/* ---------- Design tokens ---------- */
:root {
  --color-bg: #faf8f4;
  --color-ink: #181614;
  --color-ink-soft: #4a4642;
  --color-rule: rgba(24, 22, 20, 0.12);
  --color-accent: #c2552b;
  --color-accent-soft: rgba(194, 85, 43, 0.08);

  --font-display: "Fraunces", ui-serif, Georgia, "Times New Roman", serif;
  --font-body: "Inter", ui-sans-serif, system-ui, -apple-system, "Helvetica Neue", sans-serif;

  --measure: 38rem;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #181614;
    --color-ink: #f0ece6;
    --color-ink-soft: #b8b0a4;
    --color-rule: rgba(240, 236, 230, 0.12);
    --color-accent: #e7a07b;
    --color-accent-soft: rgba(231, 160, 123, 0.10);
  }
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 17px; -webkit-text-size-adjust: 100%; }
body {
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  line-height: 1.7;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.5;
  z-index: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}
@media (prefers-color-scheme: dark) {
  body::before {
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.08 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  }
}

main, header, footer { position: relative; z-index: 1; }

/* ---------- Header ---------- */
.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-rule);
}
.wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-variation-settings: "opsz" 144, "SOFT" 100;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  text-decoration: none;
}
.wordmark::after { content: "."; color: var(--color-accent); }

.site-nav {
  display: flex;
  gap: var(--space-md);
  font-size: 0.85rem;
  font-feature-settings: "ss01";
}
.site-nav a {
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: color 120ms ease;
}
.site-nav a:hover { color: var(--color-accent); }
.site-nav a.active { color: var(--color-ink); }

/* ---------- Layout containers ---------- */
.prose {
  max-width: var(--measure);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.prose .lede {
  font-family: var(--font-display);
  font-weight: 400;
  font-variation-settings: "opsz" 144;
  font-size: clamp(1.5rem, 2.5vw + 0.5rem, 2rem);
  line-height: 1.3;
  color: var(--color-ink);
  margin-bottom: var(--space-md);
  letter-spacing: -0.025em;
}

.prose h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-variation-settings: "opsz" 144;
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-md);
}
.prose .meta {
  font-size: 0.8rem;
  color: var(--color-ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-xl);
  display: block;
}
.prose h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-variation-settings: "opsz" 36;
  font-size: 1.5rem;
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
}
.prose h2::before {
  content: counter(section, decimal-leading-zero);
  counter-increment: section;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.75rem;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  flex: 0 0 auto;
}
.prose { counter-reset: section; }

.prose h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

.prose p {
  font-size: 1rem;
  margin-bottom: var(--space-sm);
  color: var(--color-ink);
}
.prose p + p { margin-top: 0; }
.prose ul, .prose ol {
  margin-bottom: var(--space-sm);
  padding-left: 1.25rem;
}
.prose li { margin-bottom: 0.25rem; }
.prose strong { font-weight: 600; }
.prose em { font-style: italic; color: var(--color-ink-soft); }

.prose a {
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: text-decoration-thickness 120ms ease;
}
.prose a:hover { text-decoration-thickness: 2px; }

.prose hr {
  border: 0;
  border-top: 1px solid var(--color-rule);
  margin: var(--space-xl) 0;
}

.prose blockquote {
  border-left: 2px solid var(--color-accent);
  padding-left: var(--space-md);
  margin: var(--space-md) 0;
  font-style: italic;
  color: var(--color-ink-soft);
}

.prose code {
  font-family: ui-monospace, "SF Mono", "Cascadia Mono", monospace;
  font-size: 0.9em;
  background: var(--color-accent-soft);
  padding: 0.1em 0.3em;
  border-radius: 3px;
}

/* ---------- Landing page ---------- */
.hero {
  max-width: var(--measure);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
  text-align: left;
}
.hero h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-variation-settings: "opsz" 144;
  font-size: clamp(3rem, 8vw, 6rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
  margin-bottom: var(--space-md);
}
.hero h1 em {
  font-style: italic;
  color: var(--color-accent);
  font-variation-settings: "opsz" 144, "SOFT" 100;
}
.hero .tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(1.2rem, 2vw + 0.5rem, 1.6rem);
  color: var(--color-ink-soft);
  margin-bottom: var(--space-xl);
  max-width: 32ch;
  line-height: 1.4;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-md);
  margin: var(--space-xl) 0;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-rule);
}
.feature-grid .feature {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.feature .num {
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--color-accent);
}
.feature h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-variation-settings: "opsz" 36;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
  color: var(--color-ink);
}
.feature p {
  font-size: 0.9rem;
  color: var(--color-ink-soft);
  line-height: 1.5;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-rule);
  padding: var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.8rem;
  color: var(--color-ink-soft);
}
.site-footer a {
  color: inherit;
  text-decoration: none;
  margin-left: var(--space-md);
}
.site-footer a:hover { color: var(--color-accent); }

@media (max-width: 600px) {
  .site-header { flex-direction: column; align-items: flex-start; gap: var(--space-sm); }
  .site-footer { flex-direction: column; align-items: flex-start; gap: var(--space-sm); }
  .site-footer a { margin-left: 0; margin-right: var(--space-md); }
  .prose { padding: var(--space-xl) var(--space-md); }
}