:root {
  color-scheme: light;
  --ink: #111315;
  --muted: #5c6268;
  --line: #dfe3e6;
  --accent: #2f6bff;
  --warning-bg: #fff8dd;
  --warning-border: #d99b00;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: #f6f7f8; line-height: 1.75; }
main { width: min(860px, calc(100% - 32px)); margin: 32px auto; padding: 40px; background: #fff; border: 1px solid var(--line); border-radius: 18px; }
h1 { margin: 0 0 8px; font-size: clamp(28px, 5vw, 42px); line-height: 1.2; }
h2 { margin: 36px 0 8px; padding-top: 12px; border-top: 1px solid var(--line); font-size: 22px; }
h3 { margin: 24px 0 6px; font-size: 18px; }
p, li { font-size: 16px; }
.meta, .muted { color: var(--muted); }
.todo { margin: 22px 0; padding: 16px 18px; background: var(--warning-bg); border-left: 4px solid var(--warning-border); border-radius: 8px; }
.todo strong { display: block; margin-bottom: 6px; }
code { padding: 2px 5px; border-radius: 4px; background: #f0f2f4; }
a { color: var(--accent); }
nav { display: flex; flex-wrap: wrap; gap: 14px; margin: 20px 0 28px; }
table { width: 100%; border-collapse: collapse; display: block; overflow-x: auto; }
th, td { padding: 10px; border: 1px solid var(--line); text-align: left; vertical-align: top; min-width: 130px; }
th { background: #f3f5f7; }
footer { margin-top: 42px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); }
@media (max-width: 640px) { main { margin: 0; width: 100%; padding: 24px 18px; border: 0; border-radius: 0; } }