:root {
  --paper: #f4f1ea;
  --paper-2: #ebe6da;
  --ink: #131b18;
  --ink-soft: #4b554f;
  --line: #cfc8b8;
  --accent: #b23a0a;
  --accent-ink: #8f2d06;
  --green: #0f5132;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --wrap: 72rem;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 1.0625rem/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent-ink); text-underline-offset: .18em; }
a:hover { color: var(--ink); }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: .7rem 1rem;
  z-index: 20;
}
.skip:focus { left: 1rem; top: 1rem; }

.wrap {
  width: min(100% - 2.5rem, var(--wrap));
  margin-inline: auto;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 4.75rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 750;
  font-size: 1.15rem;
  letter-spacing: -.02em;
}
.mark { width: 1.65rem; height: 1.65rem; color: var(--accent); }
.site-header nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.site-header nav a:not(.button) {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: .95rem;
  font-weight: 550;
}
.site-header nav a:not(.button):hover { color: var(--ink); }

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 999px;
  padding: .85rem 1.35rem;
  font-weight: 650;
  font-size: .98rem;
  line-height: 1.2;
  text-decoration: none;
  transition: background .15s ease, color .15s ease;
}
.button:hover,
.button:focus-visible { background: var(--accent); border-color: var(--accent); color: #fff; }
.button-small { padding: .55rem 1rem; font-size: .9rem; }

.text-link {
  color: var(--ink);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--ink);
  padding-bottom: .1rem;
}
.text-link:hover { color: var(--accent-ink); border-color: var(--accent-ink); }

/* Hero */
.hero { padding: clamp(3.5rem, 8vw, 7rem) 0 clamp(3rem, 7vw, 6rem); }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(17rem, .9fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}
.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent-ink);
  font: 650 .78rem/1.2 var(--mono);
  letter-spacing: .14em;
  text-transform: uppercase;
}
h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -.025em;
  line-height: 1.02;
  text-wrap: balance;
}
h1 {
  margin: 0 0 1.5rem;
  font-size: clamp(3.1rem, 8.2vw, 6.4rem);
}
h1 em { color: var(--accent-ink); font-style: italic; }
.lead {
  margin: 0 0 1.1rem;
  max-width: 38rem;
  font-size: clamp(1.12rem, 1.9vw, 1.32rem);
  line-height: 1.55;
}
.note {
  margin: 0 0 2rem;
  max-width: 36rem;
  color: var(--ink-soft);
  font-size: .98rem;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.4rem;
}

/* Scope panel */
.scope {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(1.6rem, 3vw, 2.2rem);
  border-radius: 1.1rem;
  margin-top: .6rem;
}
.scope h2 {
  margin: 0 0 1.2rem;
  font-size: 1.45rem;
  letter-spacing: -.01em;
}
.scope ul { list-style: none; margin: 0; padding: 0; }
.scope li {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: .7rem;
  padding: .85rem 0;
  border-top: 1px solid rgba(244,241,234,.18);
  font-size: .98rem;
  line-height: 1.45;
}
.scope li span {
  color: #e7a07f;
  font: 600 .78rem/1.7 var(--mono);
  letter-spacing: .06em;
}
.scope-foot {
  margin: 1.2rem 0 0;
  color: #c9cfc7;
  font-size: .86rem;
  line-height: 1.5;
}

/* Sections */
.section { padding: clamp(3.5rem, 7vw, 6rem) 0; border-top: 1px solid var(--line); }
.section-alt { background: var(--paper-2); }
.section-head { max-width: 44rem; margin-bottom: clamp(2rem, 4vw, 3rem); }
.section-head h2 {
  margin: 0;
  font-size: clamp(2rem, 4.6vw, 3.4rem);
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.1rem;
}
.card {
  display: flex;
  flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: .9rem;
  padding: 1.6rem;
}
.section-alt .card { background: var(--paper); }
.card-feature { border-top: 4px solid var(--accent); }
.card-muted { background: transparent; border-style: dashed; }
.card .tag {
  margin: 0 0 1rem;
  color: var(--ink-soft);
  font: 600 .72rem/1.2 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
}
.card h3 {
  margin: 0 0 .7rem;
  font-size: 1.65rem;
  letter-spacing: -.015em;
}
.card p { margin: 0 0 1rem; color: var(--ink-soft); font-size: .97rem; }
.card p:last-child { margin-bottom: 0; }
.card code {
  font: .88em/1.4 var(--mono);
  background: var(--paper-2);
  padding: .1em .35em;
  border-radius: .25em;
  color: var(--ink);
}
.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  margin-top: auto;
  padding-top: .6rem;
}
.card-links a { font-weight: 650; font-size: .93rem; text-decoration: none; }
.card-links a:hover { text-decoration: underline; }

/* Principles */
.principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2rem 3.5rem;
}
.principles li { border-top: 1px solid var(--line); padding-top: 1.3rem; }
.principles h3 { margin: 0 0 .5rem; font-size: 1.45rem; letter-spacing: -.01em; }
.principles p { margin: 0; color: var(--ink-soft); max-width: 30rem; }

/* Contribute */
.contribute {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) auto;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}
.contribute h2 { margin: 0 0 1.1rem; font-size: clamp(2rem, 4.6vw, 3.4rem); }
.contribute .lead { margin-bottom: 0; }
.contribute-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.1rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.4rem 0 2.8rem;
  font-size: .9rem;
  color: var(--ink-soft);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.5rem;
}
.site-footer p { margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: .6rem; }
.footer-links a { color: var(--ink); text-decoration: none; }
.footer-links a:hover { text-decoration: underline; }

/* Responsive */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .scope { max-width: 34rem; }
  .cards { grid-template-columns: 1fr; }
  .contribute { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  body { font-size: 1rem; }
  .header-inner { flex-wrap: wrap; padding: .85rem 0; gap: .75rem; }
  .site-header nav { gap: .85rem; width: 100%; flex-wrap: wrap; }
  .site-header nav .button { margin-left: auto; }
  .principles { grid-template-columns: 1fr; gap: 1.4rem; }
  .actions { align-items: flex-start; flex-direction: column; gap: 1rem; }
  .hero { padding-top: 2.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}