:root {
  --bg: #ffffff;
  --text: #1a1c17;
  --muted: #5c6152;
  --border: #dfe2d8;
  --accent: #4f6b00;
  --surface: #f5f6f1;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --text: #ecece2;
    --muted: #9ca08f;
    --border: #2a2e22;
    --accent: #c8ff00;
    --surface: #0e100c;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
  padding-bottom: 16px;
}

.brand {
  font: 600 14px/1 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-decoration: none;
}

nav { margin-top: 12px; font-size: 14px; }
nav a { margin-right: 16px; }

h1 { font-size: 28px; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 40px 0 8px; }
h3 { font-size: 17px; margin: 24px 0 8px; }

a { color: var(--accent); }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 24px; }

.note {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
}

.placeholder {
  background: #fff3b0;
  color: #5a4600;
  padding: 0 4px;
  border-radius: 3px;
}

code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.9em; word-break: break-all; }

ul { padding-left: 20px; }

footer {
  border-top: 1px solid var(--border);
  margin-top: 48px;
  padding-top: 16px;
  color: var(--muted);
  font-size: 13px;
}

hr { border: 0; border-top: 1px solid var(--border); margin: 48px 0; }