:root {
  --fg: #2d2d2d;
  --bg: #faf9f7;
  --accent: #1a6b50;
  --accent-soft: rgba(26, 107, 80, 0.06);
  --border: #d5d0c8;
  --code-bg: #f0eeea;
  --heading: #1a1a1a;
  --muted: #70695f;
}

::selection {
  background: rgba(26, 107, 80, 0.15);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: Charter, "Bitstream Charter", "Sitka Text", Cambria, serif;
  font-size: 1.05rem;
  line-height: 1.78;
  color: var(--fg);
  background: var(--bg);
  max-width: 50rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

h1,
h2,
h3,
h4 {
  font-family: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.35;
}

h1 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--heading);
  margin: 0 0 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 3px solid var(--accent);
}

h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--heading);
  margin: 3rem 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent);
  margin: 2.5rem 0 0.5rem;
  padding: 0.4rem 0.75rem;
  border-left: 3px solid var(--accent);
  background: linear-gradient(135deg, var(--accent-soft), transparent 80%);
  border-radius: 0 3px 3px 0;
}

h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--muted);
  margin: 2rem 0 0.5rem;
  padding-bottom: 0.2rem;
  border-bottom: 1px dashed var(--border);
}

p {
  margin: 0.8rem 0;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: text-decoration-thickness 0.15s;
}

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

strong {
  color: var(--heading);
  font-weight: 700;
}

ol,
ul {
  padding-left: 1.75rem;
}

li + li {
  margin-top: 0.3rem;
}

code {
  font-family: "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  border: 1px solid rgba(0, 0, 0, 0.06);
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  line-height: 1.55;
}

pre code {
  background: none;
  padding: 0;
  border: none;
  font-size: 0.85em;
}

img {
  max-width: 100%;
  height: auto;
}

.heading-anchor {
  opacity: 0;
  margin-left: 0.3em;
  font-weight: 400;
  text-decoration: none;
  transition: opacity 0.15s;
}

h1:hover .heading-anchor,
h2:hover .heading-anchor,
h3:hover .heading-anchor,
h4:hover .heading-anchor,
.heading-anchor:focus {
  opacity: 0.4;
}

.heading-anchor:hover {
  opacity: 1;
}

.page-nav {
  margin-bottom: 2.5rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.page-nav a {
  font-family: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--muted);
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  transition:
    color 0.15s,
    border-color 0.15s,
    background 0.15s;
}

.page-nav a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.page-nav a.active {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
}