:root {
  color-scheme: light;
  --bg: #f6f7f7;
  --surface: #fff;
  --text: #1e1e1e;
  --muted: #5f6165;
  --border: #dcdcde;
  --link: #3858e9;
  --link-hover: #1e35a8;
  --code-bg: #f0f0f1;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  line-height: 1.6;
}
a { color: var(--link); }
a:hover { color: var(--link-hover); }
.site-header {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem max(1rem, calc((100vw - 1120px) / 2));
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(10px);
}
.site-title {
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}
.site-header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.95rem;
}
.site-header nav a { text-decoration: none; }
.page {
  width: min(100%, 980px);
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}
.page > * {
  background: transparent;
}
h1, h2, h3, h4 { line-height: 1.25; }
h1 { font-size: clamp(2rem, 4vw, 3.4rem); margin-top: 0; }
h2 { margin-top: 2.4rem; padding-top: 0.4rem; border-top: 1px solid var(--border); }
h3 { margin-top: 1.8rem; }
p, li { max-width: 78ch; }
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: auto;
  display: block;
}
th, td {
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--border);
  vertical-align: top;
}
th { text-align: left; background: #f0f0f1; }
pre {
  overflow-x: auto;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #111827;
  color: #f9fafb;
}
code {
  padding: 0.1rem 0.25rem;
  border-radius: 4px;
  background: var(--code-bg);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}
pre code { padding: 0; background: transparent; color: inherit; }
blockquote {
  margin: 1.2rem 0;
  padding: 0.9rem 1rem;
  border-left: 4px solid var(--link);
  background: #eef2ff;
  color: #1f2937;
}
img { max-width: 100%; height: auto; }
hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }
.callout-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.callout-card {
  display: block;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  text-decoration: none;
}
.callout-card strong { display: block; color: var(--text); margin-bottom: 0.25rem; }
.callout-card span { color: var(--muted); }
@media (max-width: 700px) {
  .site-header { align-items: flex-start; flex-direction: column; }
  .page { padding-top: 1.25rem; }
}