:root {
  --bg: #fdfbf7;
  --text: #1b1b1b;
  --muted: #4a4a4a;
  --accent: #1f5fbf;
  --accent-soft: #e8f0ff;
  --mono: "SFMono-Regular", "JetBrains Mono", "Fira Code", "Menlo", monospace;
  --serif: "Iowan Old Style", "Book Antiqua", "Palatino", "Merriweather", Georgia, serif;
  --sans: "Source Sans Pro", "Inter", "Helvetica Neue", Arial, sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  max-width: 780px;
  margin: 3rem auto 4rem;
  padding: 0 1.5rem;
  line-height: 1.7;
  font-size: 18px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--sans);
  letter-spacing: 0.01em;
  color: #0f1c3f;
  margin: 2.1rem 0 0.85rem;
  line-height: 1.25;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 1.9rem;
  border-bottom: 1px solid rgba(15, 28, 63, 0.1);
  padding-bottom: 0.35rem;
}

h3 {
  font-size: 1.45rem;
}

p {
  margin: 0 0 1.15em;
}

ul,
ol {
  padding-left: 1.4em;
  margin: 0 0 1.2em;
}

li {
  margin-bottom: 0.55em;
}

blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5em 1.1em;
  margin: 1.7em 0;
  background: var(--accent-soft);
  color: var(--text);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code,
pre {
  font-family: var(--mono);
  font-size: 0.95em;
  background: #f1f3f7;
}

code {
  padding: 0.15em 0.35em;
  border-radius: 4px;
}

pre {
  padding: 1.05em;
  border-radius: 6px;
  overflow-x: auto;
}

pre code {
  padding: 0;
  background: none;
}

table {
  border-collapse: collapse;
  margin: 1.5em 0;
  width: 100%;
  font-size: 0.95em;
}

th,
td {
  border: 1px solid #e1e5f0;
  padding: 0.6em 0.8em;
  text-align: left;
}

th {
  background: #f5f7fb;
  font-weight: 600;
}

hr {
  border: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, rgba(0, 0, 0, 0.15), transparent);
  margin: 2rem 0;
}

img {
  max-width: 100%;
  display: block;
  margin: 1.2em auto;
  border-radius: 6px;
}

figure {
  margin: 1.5em 0;
  text-align: center;
}

figcaption {
  margin-top: 0.6em;
  color: var(--muted);
  font-size: 0.95em;
}

.toc {
  background: #f7f8fb;
  border: 1px solid #e2e6f3;
  border-radius: 8px;
  padding: 1rem 1.25rem;
}

.toc ul {
  list-style: none;
  padding-left: 0;
}

.toc li {
  margin: 0.35em 0;
}

.toc a {
  text-decoration: none;
  color: var(--text);
}

.toc a:hover {
  color: var(--accent);
}