:root {
  --bg: #ffffff;
  --text: #171717;
  --muted: #666666;
  --border: #e6e6e6;
  --code-bg: #f7f7f7;
  --link: #0645ad;
  --max-width: 860px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  color: var(--text);
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

body {
  margin: 0;
  background: var(--bg);
}

.page {
  width: 100%;
}

.article {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px 24px 96px;
}

h1,
h2,
h3,
h4 {
  line-height: 1.25;
  color: var(--text);
  font-weight: 700;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  letter-spacing: -0.04em;
  margin: 0 0 1.25rem;
}

h2 {
  font-size: 1.65rem;
  letter-spacing: -0.02em;
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

h3 {
  font-size: 1.25rem;
  margin-top: 2rem;
}

h4 {
  font-size: 1rem;
  margin-top: 1.5rem;
}

p,
ul,
ol,
table,
pre,
blockquote {
  margin-top: 1rem;
  margin-bottom: 1rem;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover {
  text-decoration-thickness: 2px;
}

blockquote {
  border-left: 4px solid var(--border);
  margin-left: 0;
  margin-right: 0;
  padding: 0.75rem 1rem;
  color: var(--muted);
  background: #fafafa;
}

code {
  font-family:
    ui-monospace,
    SFMono-Regular,
    Menlo,
    Monaco,
    Consolas,
    "Liberation Mono",
    monospace;
  font-size: 0.92em;
  background: var(--code-bg);
  padding: 0.12em 0.32em;
  border-radius: 4px;
}

pre {
  overflow-x: auto;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--code-bg);
}

pre code {
  padding: 0;
  background: transparent;
  border-radius: 0;
}

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

th,
td {
  border: 1px solid var(--border);
  padding: 0.65rem 0.75rem;
  vertical-align: top;
}

th {
  background: #fafafa;
  text-align: left;
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 3rem 0;
}

img {
  max-width: 100%;
}

.article > p:first-of-type {
  color: var(--muted);
  font-size: 1.05rem;
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 2rem 0;
  padding: 0.75rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.top-nav a {
  color: var(--text);
  font-size: 0.95rem;
  text-decoration: none;
}

.top-nav a:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  html {
    font-size: 16px;
  }

  .article {
    padding: 36px 18px 72px;
  }

  h2 {
    margin-top: 2.25rem;
  }
}