:root {
  --bg: #0f1115;
  --fg: #e8eaed;
  --muted: #9aa0a6;
  --accent: #f6821f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

main {
  width: min(640px, 100%);
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(24px, 5vw, 34px);
  letter-spacing: -0.02em;
}

p {
  margin: 0 0 12px;
  color: var(--muted);
}

ul {
  margin: 0 0 20px;
  padding-left: 20px;
  color: var(--muted);
}

code {
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--accent);
  font-size: 0.9em;
}

.hint {
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 14px;
}