:root {
  --bg: #0d1117;
  --surface: #151c26;
  --surface-2: #1e2733;
  --line: rgba(255, 255, 255, 0.08);
  --text: #e7ecf2;
  --muted: #93a0b0;
  --water: #4f9dde;
  --glow: #6fb6f2;
  --lit: #8ec9ff;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: radial-gradient(120% 80% at 50% -10%, #16222f 0%, var(--bg) 60%);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a { color: var(--lit); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header.site {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 40px;
}

.mark {
  width: 44px;
  height: 44px;
  border-radius: 11px;
  background: radial-gradient(circle at 30% 30%, var(--lit), var(--water) 55%, #1f5e94 100%);
  box-shadow: 0 0 24px rgba(111, 182, 242, 0.35);
  flex: none;
}

.brand { font-weight: 600; font-size: 18px; letter-spacing: 0.2px; }
.brand small { display: block; color: var(--muted); font-weight: 400; font-size: 13px; }

h1 { font-size: 30px; line-height: 1.2; margin: 0 0 8px; letter-spacing: -0.3px; }
h2 { font-size: 19px; margin: 36px 0 10px; color: #fff; }
h3 { font-size: 16px; margin: 24px 0 6px; color: var(--lit); }

.lede { color: var(--muted); font-size: 18px; margin: 0 0 8px; }
.meta { color: var(--muted); font-size: 13px; margin: 0 0 28px; }

p, li { color: #d2d8e0; }
ul { padding-left: 22px; }
li { margin: 6px 0; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px 26px;
  margin: 18px 0;
}

.btn {
  display: inline-block;
  background: linear-gradient(180deg, var(--lit), var(--water));
  color: #07223a;
  font-weight: 600;
  padding: 12px 22px;
  border-radius: 12px;
  margin-top: 8px;
}
.btn:hover { text-decoration: none; filter: brightness(1.06); }

.row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }

code { background: var(--surface-2); padding: 1px 6px; border-radius: 5px; font-size: 13px; }

footer.site {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}