:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #17212b;
  --muted: #64748b;
  --line: #cbd5e1;
  --panel: #f8fafc;
  --accent: #0f766e;
  --link: #1d4ed8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111827;
    --fg: #e5e7eb;
    --muted: #94a3b8;
    --line: #475569;
    --panel: #1f2937;
    --accent: #5eead4;
    --link: #93c5fd;
  }
}

html {
  scroll-behavior: smooth;
}

body {
  max-width: 1120px;
  margin: 0 auto;
  padding: 36px 28px 80px;
  background: var(--bg);
  color: var(--fg);
  font-family: "Noto Sans CJK SC", "WenQuanYi Zen Hei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.72;
}

h1,
h2,
h3,
h4 {
  letter-spacing: 0;
  line-height: 1.35;
}

h1 {
  padding-bottom: 12px;
  border-bottom: 2px solid var(--line);
}

h2 {
  margin-top: 48px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

h3 {
  margin-top: 34px;
}

a {
  color: var(--link);
}

blockquote {
  margin: 18px 0;
  padding: 10px 18px;
  border-left: 4px solid var(--accent);
  background: var(--panel);
}

table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 14px;
}

th,
td {
  padding: 8px 10px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--panel);
}

code {
  padding: 2px 5px;
  border-radius: 4px;
  background: var(--panel);
}

pre {
  overflow-x: auto;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
}

pre code {
  padding: 0;
}

img {
  display: block;
  width: auto;
  max-width: 100%;
  max-height: 82vh;
  margin: 20px auto 12px;
  background: #ffffff;
}

nav#TOC {
  padding: 16px 20px;
  border: 1px solid var(--line);
  background: var(--panel);
}

@media (max-width: 720px) {
  body {
    padding: 20px 14px 56px;
    font-size: 15px;
  }

  img {
    max-height: none;
  }
}