:root {
  --bg: #0a0a0b; --panel: #101014; --line: #26262b; --ink: #fafafa;
  --muted: #a1a1aa; --faint: #71717a; --accent: #3b82f6; --accent2: #22d3ee;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.7; -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
.blog-header { border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10;
  background: rgba(10,10,11,.85); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
.blog-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 58px; max-width: 960px; }
.brand { font-family: var(--mono); font-weight: 700; color: var(--ink); font-size: 15px; }
.brand i { color: var(--accent); font-style: normal; }
.back { font-size: 13px; color: var(--muted); }
.crumbs { font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--faint); margin: 30px 0 12px; }
h1 { font-size: clamp(26px, 4.5vw, 40px); line-height: 1.15; letter-spacing: -.02em; margin: 0 0 12px; }
.lede { color: var(--muted); font-size: 17px; margin: 0 0 8px; }
.meta { font-family: var(--mono); font-size: 11.5px; color: var(--faint); margin: 14px 0 30px; }
article h2 { font-size: 22px; margin: 34px 0 10px; letter-spacing: -.01em; }
article h3 { font-size: 17px; margin: 24px 0 8px; }
article p { color: #d4d4d8; margin: 0 0 16px; }
article ul, article ol { color: #d4d4d8; padding-left: 22px; display: flex; flex-direction: column; gap: 8px; margin: 0 0 16px; }
article b, article strong { color: var(--ink); }
article code { font-family: var(--mono); font-size: .9em; background: #16161a; border: 1px solid var(--line); border-radius: 4px; padding: 1.5px 6px; color: #60a5fa; word-break: break-word; }
article pre { background: #101014; border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; overflow-x: auto; margin: 0 0 16px; }
article pre code { background: none; border: 0; padding: 0; color: var(--muted); }
.card { display: block; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 20px; margin-bottom: 14px; transition: border-color .2s ease; }
.card:hover { border-color: #3f3f46; text-decoration: none; }
.card h2 { font-size: 18px; margin: 0 0 6px; color: var(--ink); }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.cta { margin: 36px 0; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.cta h3 { margin: 0 0 8px; font-size: 16px; }
.btn { display: inline-block; margin-top: 6px; background: var(--accent); color: #fff; font-weight: 600; font-size: 14px; padding: 10px 16px; border-radius: 9px; }
.btn:hover { background: #2563eb; text-decoration: none; }
footer { border-top: 1px solid var(--line); margin-top: 56px; padding: 26px 0; color: var(--faint); font-size: 12.5px; text-align: center; font-family: var(--mono); }
.tag { display: inline-block; font-family: var(--mono); font-size: 10px; letter-spacing: .1em; text-transform: uppercase; color: var(--accent2); border: 1px solid var(--line); border-radius: 999px; padding: 2px 9px; margin-right: 6px; }
@media (prefers-color-scheme: light) {
  :root { --bg: #f6f7f9; --panel: #ffffff; --line: #e5e7eb; --ink: #0f172a; --muted: #475569; --faint: #94a3b8; }
  .blog-header { background: rgba(255,255,255,.85); }
  article p, article ul, article ol { color: #334155; }
  article code { background: #f1f5f9; color: #2563eb; }
  article pre { background: #f8fafc; }
  article pre code { color: #475569; }
  .card:hover { border-color: #cbd5e1; }
}

/* ===== Article polish: TOC, anchors, code copy ===== */
.toc { margin: 0 0 30px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; }
.toc-title { margin: 0 0 10px; font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--faint); }
.toc-list { margin: 0; padding-left: 18px; display: flex; flex-direction: column; gap: 7px; font-size: 14.5px; }
.toc-list li { color: var(--muted); }
.toc-list .lv3 { margin-left: 6px; list-style: circle; font-size: 13.5px; }
.toc-list a { color: var(--muted); }
.toc-list a:hover { color: var(--ink); text-decoration: none; }
article h2, article h3 { position: relative; scroll-margin-top: 80px; }
article .anchor { margin-left: 8px; color: var(--faint); opacity: 0; text-decoration: none; font-weight: 400; transition: opacity .15s ease; }
article h2:hover .anchor, article h3:hover .anchor { opacity: 1; }
article hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }
article blockquote { margin: 0 0 16px; padding: 10px 16px; border-left: 3px solid var(--accent); background: rgba(59,130,246,.06); border-radius: 0 8px 8px 0; color: var(--muted); }
article table { width: 100%; border-collapse: collapse; margin: 0 0 16px; font-size: 14px; }
article th, article td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
article th { background: var(--panel); color: var(--ink); }
article pre { position: relative; }
article pre code { display: block; }
.code-copy { position: absolute; top: 8px; right: 8px; font-family: var(--mono); font-size: 10.5px; color: var(--muted);
  background: #16161a; border: 1px solid var(--line); border-radius: 6px; padding: 3px 9px; cursor: pointer;
  opacity: 0; transition: opacity .15s ease, color .15s ease; }
article pre:hover .code-copy { opacity: 1; }
.code-copy:hover { color: var(--ink); }
@media (prefers-color-scheme: light) {
  .code-copy { background: #eef2f7; }
  article blockquote { background: rgba(37,99,235,.06); }
}