:root {
  color-scheme: light;
  --paper: #f7f4ed;
  --surface: #fffdf8;
  --ink: #202522;
  --muted: #5f6962;
  --line: #d8d7ce;
  --accent: #185f55;
  --accent-soft: #e5f0ec;
  --code: #17221f;
  --code-ink: #e8f1ed;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 90% 0%, #dcebe5 0, transparent 30rem),
    var(--paper);
}

header,
main,
footer {
  width: min(72rem, calc(100% - 2rem));
  margin-inline: auto;
}

header {
  padding: 3.5rem 0 2rem;
}

main {
  padding-bottom: 4rem;
}

footer {
  padding: 1.25rem 0 3rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

h1,
h2,
h3,
h4 {
  line-height: 1.25;
  text-wrap: balance;
}

h1 {
  max-width: 19ch;
  margin: 0.3rem 0 0.75rem;
  font-size: clamp(2.15rem, 7vw, 4.5rem);
  letter-spacing: -0.045em;
}

h2 {
  margin-top: 0;
  color: var(--accent);
  font-size: clamp(1.55rem, 3vw, 2.2rem);
}

h3 {
  margin-top: 1.8rem;
}

a {
  color: var(--accent);
  text-decoration-thickness: 0.09em;
  text-underline-offset: 0.16em;
}

a:hover {
  color: #0d423b;
}

nav {
  margin-top: 1.8rem;
  padding: 1rem 1.25rem;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  border: 1px solid var(--line);
  border-radius: 0.8rem;
}

nav ol {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 0.35rem 1.5rem;
  margin: 0;
  padding-left: 1.4rem;
}

section {
  margin: 1.5rem 0;
  padding: clamp(1.2rem, 3vw, 2.4rem);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 1rem;
  box-shadow: 0 0.75rem 2.5rem rgb(27 47 39 / 6%);
  scroll-margin-top: 1rem;
}

article + article {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

p,
li {
  max-width: 80ch;
}

code,
kbd,
samp {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

:not(pre) > code {
  padding: 0.12em 0.34em;
  color: #12463f;
  background: var(--accent-soft);
  border-radius: 0.3rem;
}

.code-shell {
  position: relative;
}

pre {
  overflow-x: auto;
  margin: 1rem 0;
  padding: 1.1rem 1.25rem;
  color: var(--code-ink);
  background: var(--code);
  border-radius: 0.7rem;
  tab-size: 2;
  -webkit-overflow-scrolling: touch;
}

.code-copy {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  z-index: 1;
  padding: 0.3rem 0.55rem;
  color: var(--code-ink);
  font: inherit;
  font-size: 0.78rem;
  background: #2d3d38;
  border: 1px solid #52635d;
  border-radius: 0.35rem;
  cursor: pointer;
}

.code-copy:hover {
  background: #40544d;
}

table {
  display: block;
  overflow-x: auto;
  width: 100%;
  margin: 1rem 0 1.5rem;
  border-collapse: collapse;
}

caption {
  padding: 0.5rem;
  font-weight: 700;
  text-align: left;
}

th,
td {
  min-width: 8rem;
  padding: 0.65rem 0.75rem;
  text-align: left;
  vertical-align: top;
  border: 1px solid var(--line);
}

th {
  background: var(--accent-soft);
}

details {
  margin: 0.75rem 0;
  padding: 0.7rem 0.9rem;
  background: #faf8f2;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
}

summary {
  color: var(--accent);
  font-weight: 700;
  cursor: pointer;
}

blockquote,
aside,
[role="math"],
.diagram {
  margin: 1rem 0;
  padding: 0.8rem 1rem;
  background: var(--accent-soft);
  border-left: 0.3rem solid var(--accent);
  border-radius: 0.25rem;
}

.diagram {
  overflow-x: auto;
  white-space: pre;
  font-family: "SFMono-Regular", Consolas, monospace;
}

@media (max-width: 42rem) {
  header,
  main,
  footer {
    width: min(100% - 1rem, 72rem);
  }

  header {
    padding-top: 2rem;
  }

  section {
    border-radius: 0.7rem;
  }

  th,
  td {
    min-width: 7rem;
  }
}

@media print {
  body {
    background: white;
  }

  header,
  main,
  footer {
    width: 100%;
  }

  nav,
  .code-copy {
    display: none;
  }

  section {
    break-inside: avoid-page;
    box-shadow: none;
  }
}