:root {
  --ink: #14181f;
  --muted: #68717f;
  --line: rgba(20, 24, 31, 0.12);
  --glass: rgba(255, 255, 255, 0.72);
  --wash: #f4f5f7;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--wash) center / cover no-repeat fixed;
  color: var(--ink);
  font: 15px/1.6 "Segoe UI", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 32px;
  border-bottom: 1px solid var(--line);
  background: var(--glass);
  backdrop-filter: blur(18px);
  position: sticky;
  top: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.01em;
}

nav { display: flex; gap: 22px; }

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

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

nav a:hover { color: var(--ink); }

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 64px 32px 96px;
}

main.narrow { max-width: 720px; }

h1 {
  font-size: 40px;
  line-height: 1.15;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 17px;
  margin: 36px 0 8px;
}

p { margin: 0 0 14px; }

.hero { text-align: center; padding: 32px 0 8px; }
.hero .mark { margin-bottom: 8px; }
.hero h1 { font-size: 52px; margin-bottom: 4px; }

.lede {
  color: var(--muted);
  font-size: 16px;
  max-width: 620px;
  margin: 0 auto 22px;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin: 26px 0;
}

.button {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
}

.button:hover { background: #000; }

.version { color: var(--muted); font-size: 13px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin-top: 56px;
}

.grid article {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--glass);
  backdrop-filter: blur(14px);
}

.grid h2 { margin-top: 0; }

.grid p { color: var(--muted); margin: 0; font-size: 14px; }

.note {
  margin-top: 40px;
  padding: 24px;
  border-radius: 16px;
  background: var(--glass);
  border: 1px solid var(--line);
}

.note p { color: var(--muted); margin: 0; }

.facts {
  width: 100%;
  border-collapse: collapse;
  margin: 22px 0 8px;
  font-size: 14px;
}

.facts th,
.facts td {
  text-align: left;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.facts th {
  width: 130px;
  color: var(--muted);
  font-weight: 500;
}

code {
  font-family: ui-monospace, "Cascadia Mono", monospace;
  font-size: 12.5px;
  word-break: break-all;
}

pre {
  padding: 14px 16px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--line);
  overflow-x: auto;
}

ul { padding-left: 20px; }
li { margin-bottom: 6px; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 32px 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--ink); }