:root {
  --bg: #0b1820;
  --surface: #13242e;
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.7);
  --accent: #80e6c8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}

header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.logo {
  width: 56px; height: 56px; border-radius: 14px; flex: none;
  background: var(--surface); display: grid; place-items: center;
}
.logo span { width: 18px; height: 18px; border-radius: 50%; background: #ff4040; box-shadow: 0 0 0 6px rgba(255, 64, 64, 0.25); }

h1 { font-size: 2rem; line-height: 1.2; margin: 0; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; }
p, li { color: var(--muted); }
ul { padding-left: 20px; }
a { color: var(--accent); }
code { font-size: 0.9em; overflow-wrap: anywhere; }
.subtitle { margin: 4px 0 0; font-size: 0.95rem; }
.lang { margin-top: 56px; padding-top: 24px; border-top: 1px solid rgba(255, 255, 255, 0.12); }
footer { margin-top: 48px; font-size: 0.9rem; }