:root {
  color-scheme: light dark;
  --bg: #f5f5f3;
  --surface: rgba(255, 255, 255, 0.76);
  --text: #141414;
  --muted: #686868;
  --line: rgba(20, 20, 20, 0.12);
  --accent: #141414;
  --accent-text: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #090909;
    --surface: rgba(24, 24, 24, 0.82);
    --text: #f2f2f0;
    --muted: #a0a09b;
    --line: rgba(255, 255, 255, 0.13);
    --accent: #f2f2f0;
    --accent-text: #111111;
  }
}

* { box-sizing: border-box; }

html { font-size: 16px; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 82% 2%, rgba(127, 127, 127, 0.12), transparent 30rem),
    var(--bg);
  color: var(--text);
  line-height: 1.72;
  min-height: 100vh;
}

a { color: inherit; text-underline-offset: 0.22em; }

.shell {
  width: min(100% - 2rem, 760px);
  margin: 0 auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  border-bottom: 1px solid var(--line);
}

.brand {
  color: var(--text);
  font-size: 0.94rem;
  font-weight: 720;
  letter-spacing: 0.16em;
  text-decoration: none;
}

nav { display: flex; gap: 1rem; }

nav a {
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

nav a[aria-current="page"], nav a:hover { color: var(--text); }

main { padding: 4.5rem 0 5rem; }

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  max-width: 15ch;
  margin: 0;
  font-size: clamp(2.4rem, 9vw, 4.8rem);
  font-weight: 620;
  letter-spacing: -0.055em;
  line-height: 0.98;
}

.lede {
  max-width: 42rem;
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2.5vw, 1.22rem);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.25rem;
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 3.25rem;
}

.card {
  display: block;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: 1.15rem;
  background: var(--surface);
  text-decoration: none;
}

.card h2 { margin: 0 0 0.45rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.94rem; }
.card:hover { border-color: var(--text); }

.content { margin-top: 3.5rem; }

.content section {
  padding: 2rem 0;
  border-top: 1px solid var(--line);
}

.content h2 {
  margin: 0 0 0.85rem;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.content h3 { margin: 1.5rem 0 0.5rem; font-size: 1rem; }
.content p, .content ul { margin: 0.65rem 0; }
.content ul { padding-left: 1.25rem; }
.content li + li { margin-top: 0.45rem; }
.muted { color: var(--muted); }

.button {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  margin-top: 1rem;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 650;
  text-decoration: none;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
}

@media (max-width: 620px) {
  header { align-items: flex-start; flex-direction: column; justify-content: center; gap: 0.45rem; }
  main { padding-top: 3rem; }
  .grid { grid-template-columns: 1fr; }
  footer { flex-direction: column; }
}