:root {
  --ink: #172033;
  --muted: #5d6b82;
  --line: #d9e0ea;
  --paper: #ffffff;
  --soft: #f5f7fb;
  --brand: #0f766e;
  --brand-dark: #0b5d57;
  --code: #f0f4f8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--soft);
  font-family: ui-serif, "Noto Serif SC", "Songti SC", Georgia, serif;
  line-height: 1.75;
}

a {
  color: var(--brand-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
}

.wrap {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 20px;
}

.brand {
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-weight: 800;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 18px;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 14px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
}

.content {
  margin: 36px auto 64px;
  padding: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
}

h1,
h2,
h3 {
  font-family: ui-sans-serif, system-ui, sans-serif;
  line-height: 1.28;
}

h1 {
  margin: 0 0 22px;
  font-size: clamp(30px, 5vw, 48px);
}

h2 {
  margin-top: 42px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 26px;
}

h3 {
  margin-top: 30px;
  font-size: 20px;
}

p,
li {
  font-size: 17px;
}

code {
  padding: 2px 6px;
  border-radius: 5px;
  background: var(--code);
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 0.92em;
}

pre {
  overflow-x: auto;
  padding: 18px;
  border-radius: 8px;
  background: #111827;
  color: #e5edf8;
}

pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}

.post-meta {
  margin: -10px 0 28px;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 14px;
}

.site-footer {
  padding: 26px 0 40px;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 14px;
}

@media (max-width: 640px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 18px 0;
  }

  .content {
    margin-top: 20px;
    padding: 24px;
  }
}