:root {
  --paper: #ffffff;
  --ground: #f6f7fa;
  --ink: #14181f;
  --ink-soft: #39414f;
  --muted: #626b7a;
  --rule: #e2e6ee;
  --accent: #2f6be8;
  --accent-soft: #eaf1fe;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #151a23;
    --ground: #0d1016;
    --ink: #eef1f7;
    --ink-soft: #c3cad8;
    --muted: #8b95a6;
    --rule: #262e3c;
    --accent: #7aa5ff;
    --accent-soft: #18243a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 44rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

/* ---------- header ---------- */

header.site {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding-bottom: 1.75rem;
  margin-bottom: 2.25rem;
  border-bottom: 1px solid var(--rule);
}

.mark {
  width: 2.6rem;
  height: 2.6rem;
  flex: none;
  border-radius: 0.65rem;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-content: center;
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: -0.02em;
}

header.site .titles { display: flex; flex-direction: column; }
header.site strong { font-size: 1.05rem; letter-spacing: -0.01em; }
header.site span { color: var(--muted); font-size: 0.88rem; }

/* ---------- type ---------- */

h1 {
  font-size: clamp(1.9rem, 5vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin: 0 0 0.5rem;
}

h2 {
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  margin: 2.5rem 0 0.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

h2:first-of-type { border-top: 0; padding-top: 0; }

h3 { font-size: 1rem; margin: 1.5rem 0 0.4rem; }

p { margin: 0 0 1rem; color: var(--ink-soft); }
p.lede { font-size: 1.05rem; color: var(--muted); margin-bottom: 2rem; }

ul { margin: 0 0 1rem; padding-left: 1.25rem; color: var(--ink-soft); }
li { margin-bottom: 0.45rem; }
li::marker { color: var(--muted); }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

strong { color: var(--ink); }

/* ---------- summary card ---------- */

.summary {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 0.85rem;
  padding: 1.5rem 1.6rem 0.75rem;
  margin-bottom: 2.5rem;
}

.summary h2 {
  border: 0;
  padding: 0;
  margin: 0 0 0.9rem;
  font-size: 0.72rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--muted);
}

.summary ul { padding-left: 1.15rem; }

/* ---------- support links ---------- */

.links { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.5rem 0 0; }

.links a {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 0.6rem;
  padding: 0.7rem 1.1rem;
  text-decoration: none;
  font-weight: 550;
  font-size: 0.95rem;
  color: var(--ink);
}

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

/* ---------- footer ---------- */

footer {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.88rem;
}

footer p { color: var(--muted); margin-bottom: 0.4rem; }