:root {
  --bg: #f4f5f7; --surface: #fff; --border: #e1e4ea; --text: #1c2024;
  --muted: #667080; --primary: #3b5bfd; --code-bg: #f0f2f6;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "Cascadia Code", Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1014; --surface: #161a21; --border: #272d3a; --text: #dfe3ea;
    --muted: #98a1b0; --primary: #7d94ff; --code-bg: #1b202a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: var(--font); background: var(--bg); color: var(--text);
  line-height: 1.65; font-size: 16px;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
header {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.75rem 1.5rem;
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 0.6rem; font-weight: 700; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.brand span.muted { font-weight: 500; font-size: 0.8rem; color: var(--muted); }
nav { display: flex; gap: 0.85rem; align-items: center; flex-wrap: wrap; font-size: 0.9rem; }
main { max-width: 880px; margin: 0 auto; padding: 2rem 1.25rem 4rem; }
.hero h1 { font-size: 2rem; margin: 0 0 0.5rem; letter-spacing: -0.02em; }
.hero p { color: var(--muted); margin: 0 0 1.75rem; max-width: 42rem; }
.grid { display: grid; gap: 0.85rem; }
@media (min-width: 640px) { .grid { grid-template-columns: 1fr 1fr; } }
.card {
  display: block; padding: 1.1rem 1.2rem; border: 1px solid var(--border);
  border-radius: 12px; background: var(--surface); color: inherit;
  transition: border-color .15s;
}
.card:hover { border-color: var(--primary); text-decoration: none; }
.card h2 { margin: 0 0 0.35rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.card .lang { margin-top: 0.7rem; font-size: 0.8rem; }
.section-title { margin: 2rem 0 0.85rem; font-size: 0.75rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted); }
article h1 { font-size: 1.85rem; margin: 0 0 1rem; }
article h2 { font-size: 1.3rem; margin: 1.8rem 0 0.7rem; }
article h3 { font-size: 1.1rem; margin: 1.4rem 0 0.5rem; }
article p, article li { color: var(--text); }
article hr { border: none; border-top: 1px solid var(--border); margin: 1.5rem 0; }
article code, article pre {
  font-family: var(--mono); font-size: 0.88em; background: var(--code-bg);
}
article code { padding: 0.1em 0.35em; border-radius: 4px; }
article pre {
  padding: 0.9rem 1rem; border-radius: 10px; overflow-x: auto;
  border: 1px solid var(--border);
}
article pre code { padding: 0; background: none; }
article table { width: 100%; border-collapse: collapse; font-size: 0.92rem; margin: 1rem 0; }
article th, article td {
  border: 1px solid var(--border); padding: 0.45rem 0.65rem; text-align: left;
  vertical-align: top;
}
article th { background: var(--code-bg); }
.meta { color: var(--muted); font-size: 0.85rem; margin-bottom: 1.25rem; }
footer {
  max-width: 880px; margin: 0 auto; padding: 0 1.25rem 2.5rem;
  color: var(--muted); font-size: 0.85rem;
}