@page {
  margin: 18mm 16mm 18mm 16mm;
}

:root {
  color-scheme: light;
  --bg: #f3f0e8;
  --surface: #fffdf8;
  --text: #1f2933;
  --muted: #52606d;
  --accent: #0f766e;
  --accent-soft: #d9f3ef;
  --border: #d7d2c8;
  --code-bg: #f4efe6;
}

html {
  font-size: 16px;
}

body {
  margin: 0 auto;
  max-width: 920px;
  padding: 2.25rem 1.5rem 4rem;
  font-family: "Noto Sans", "Segoe UI", sans-serif;
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.08), transparent 28%),
    radial-gradient(circle at top right, rgba(194, 65, 12, 0.08), transparent 24%),
    linear-gradient(180deg, var(--bg) 0%, #efe9de 100%);
}

main,
article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2rem;
  box-shadow: 0 18px 45px rgba(31, 41, 51, 0.08);
}

h1,
h2,
h3,
h4 {
  font-family: "Noto Serif", "Georgia", serif;
  line-height: 1.2;
  color: #102a43;
}

h1 {
  font-size: 2.3rem;
  margin-top: 0;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.6rem;
  margin-top: 2.1rem;
  padding-top: 0.4rem;
  border-top: 1px solid var(--border);
}

h3 {
  font-size: 1.2rem;
  margin-top: 1.5rem;
}

p,
li {
  font-size: 1rem;
}

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

code {
  font-family: "JetBrains Mono", "SFMono-Regular", monospace;
  font-size: 0.92em;
  background: var(--code-bg);
  padding: 0.1rem 0.32rem;
  border-radius: 0.35rem;
}

pre code {
  display: block;
  padding: 1rem;
  overflow-x: auto;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.6rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: #f4efe6;
}

nav#TOC {
  margin: 1.25rem 0 2rem;
  padding: 1rem 1.2rem;
  background: #f6fbfa;
  border: 1px solid #cbe7e3;
  border-radius: 16px;
}

nav#TOC ul {
  padding-left: 1.2rem;
}

@media print {
  body {
    max-width: none;
    padding: 0;
    background: white;
  }

  main,
  article {
    border: none;
    border-radius: 0;
    box-shadow: none;
    padding: 0;
  }
}