/* AnchorKey site — minimal, readable, no JS, no fonts loaded externally. */

:root {
  --fg: #111;
  --fg-soft: #555;
  --bg: #fff;
  --accent: #0a84ff;
  --rule: #e7e7e9;
  --code-bg: #f5f5f7;
  --max-w: 36rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #f2f2f7;
    --fg-soft: #b8b8c0;
    --bg: #0d0d10;
    --accent: #5ac8fa;
    --rule: #2c2c2e;
    --code-bg: #1c1c1e;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 4rem 1.5rem 6rem;
}

header {
  margin-bottom: 3rem;
}

h1 {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.4rem;
}

h2 {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 2.5rem 0 0.75rem;
}

p, ul {
  margin: 0 0 1rem;
  color: var(--fg);
}

ul {
  padding-left: 1.25rem;
}

li {
  margin-bottom: 0.4rem;
}

.tagline {
  color: var(--fg-soft);
  font-size: 1.05rem;
  margin: 0;
}

.constraint {
  font-weight: 600;
  font-size: 1.05rem;
  border-left: 3px solid var(--accent);
  padding: 0.25rem 0 0.25rem 0.9rem;
  margin: 0.5rem 0 1rem;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code {
  background: var(--code-bg);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
}

section {
  border-top: 1px solid var(--rule);
  padding-top: 1.75rem;
  margin-top: 1.75rem;
}

section:first-of-type {
  border-top: 0;
  padding-top: 0;
  margin-top: 0;
}

footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  color: var(--fg-soft);
  font-size: 0.9rem;
}

footer a {
  color: var(--fg-soft);
}