/* BabelStack blog (served by the backend at /blog/static/blog.css). Dark theme only; tokens from the site. */
:root {
  --bg: #110c0c;
  --surface: #191213;
  --raised: #221a1b;
  --text: #f4ede7;
  --soft: #d8cdc5;
  --muted: #ab9c93;
  --cream: #f2e4d3;
  --red: #c8392f;
  --line: rgb(245 236 227 / 0.1);
  --line-strong: rgb(245 236 227 / 0.22);
  /* Fraunces has no Cyrillic; Playfair Display fills in those glyphs. */
  --serif: "Fraunces", "Playfair Display", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --zh: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: dark;
}
*, *::before, *::after { box-sizing: border-box; }
html { background: var(--bg); -webkit-text-size-adjust: 100%; }
body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; background: var(--bg); color: var(--text); font: 400 17px/1.7 var(--sans); }
:lang(zh) { font-family: var(--zh); }
a { color: var(--cream); text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--cream); }
a:focus-visible { outline: 2px solid var(--cream); outline-offset: 2px; border-radius: 2px; }
.wrap { width: 100%; max-width: 760px; margin: 0 auto; padding: 0 16px; }
.wide { max-width: 1100px; }

/* Header */
.site-head { border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; gap: 16px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; }
.brand svg { width: 24px; height: 24px; flex: none; fill: var(--text); }
.brand svg .mid { fill: var(--red); }
.brand b { font: 500 21px/1 var(--serif); letter-spacing: -0.01em; }
.nav { display: flex; align-items: center; gap: 8px; margin-left: auto; font-size: 15px; }
.nav a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 10px; color: var(--soft); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--text); }
.nav .btn { padding: 0 16px; border-radius: 2px; background: var(--cream); color: #1c0b0b; font-weight: 600; white-space: nowrap; }
.nav .btn:hover { background: #fffaf3; color: #1c0b0b; }
/* Phones: the logo mark stands in for the wordmark so the language's "Try BabelStack" button always fits. */
@media (max-width: 480px) { .brand b { display: none; } .nav { gap: 4px; } }
@media (max-width: 360px) { .nav { font-size: 14px; } .nav a { padding: 0 8px; } .nav .btn { padding: 0 10px; } }

/* Draft preview banner */
.draft { background: var(--red); color: #fff; font-size: 14px; line-height: 1.5; text-align: center; padding: 10px 16px; }
.draft strong { font-weight: 700; }

/* Main */
main { flex: 1; padding: 40px 0 64px; }
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 500; line-height: 1.2; letter-spacing: -0.01em; color: var(--text); }
h1 { font-size: clamp(30px, 6vw, 44px); margin: 0 0 16px; }
.crumbs { font-size: 14px; margin-bottom: 20px; }
.crumbs a { color: var(--muted); }
.lede { font-size: 19px; color: var(--soft); margin: 0 0 16px; }
.meta { font-size: 14px; color: var(--muted); margin: 0; }
.langs { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 14px; margin: 14px 0 0; font-size: 14px; color: var(--muted); }
.langs a { color: var(--soft); }
.langs a[aria-current="true"] { color: var(--text); text-decoration: none; font-weight: 600; }
.post-head { padding-bottom: 28px; margin-bottom: 32px; border-bottom: 1px solid var(--line); }

/* Article body */
.prose > :first-child { margin-top: 0; }
.prose h2 { font-size: 28px; margin: 44px 0 12px; }
.prose h3 { font-size: 22px; margin: 32px 0 8px; }
.prose h4, .prose h5, .prose h6 { font-size: 18px; margin: 24px 0 8px; }
.prose p, .prose ul, .prose ol, .prose blockquote, .prose pre, .prose table { margin: 0 0 18px; }
.prose ul, .prose ol { padding-left: 24px; }
.prose li { margin: 6px 0; }
.prose li::marker { color: var(--muted); }
.prose strong { color: var(--text); font-weight: 600; }
.prose blockquote { padding: 4px 0 4px 18px; border-left: 2px solid var(--red); color: var(--soft); }
.prose code { font: 0.9em/1.5 var(--mono); background: var(--raised); padding: 2px 5px; border-radius: 3px; }
.prose pre { overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: 4px; padding: 14px 16px; }
.prose pre code { background: none; padding: 0; font-size: 14px; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 36px 0; }
.prose img { max-width: 100%; height: auto; border-radius: 4px; }
.prose table { display: block; overflow-x: auto; border-collapse: collapse; font-size: 15px; }
.prose th, .prose td { padding: 8px 12px; border: 1px solid var(--line-strong); text-align: left; vertical-align: top; }
.prose th { background: var(--surface); font-weight: 600; }
.prose sup { line-height: 0; }
.prose .footnote-ref a { text-decoration: none; font-size: 0.8em; }
.prose .footnotes-sep { margin-top: 48px; }
.prose .footnotes { font-size: 15px; color: var(--soft); }
.prose .footnote-backref { text-decoration: none; }

.tags { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 32px 0 0; }
.tags li { font-size: 13px; color: var(--soft); border: 1px solid var(--line-strong); border-radius: 999px; padding: 2px 12px; }
.sources { margin-top: 44px; padding-top: 24px; border-top: 1px solid var(--line); font-size: 15px; }
.sources h2 { font-size: 22px; margin: 0 0 12px; }
.sources ol { margin: 0; padding-left: 24px; }
.sources li { margin: 6px 0; overflow-wrap: anywhere; }
.cta { margin-top: 48px; padding: 24px; background: var(--surface); border: 1px solid var(--line); border-radius: 4px; }
.cta p { margin: 0 0 16px; color: var(--soft); }
.button { display: inline-flex; align-items: center; min-height: 44px; padding: 0 20px; border-radius: 2px; background: var(--cream); color: #1c0b0b; font-weight: 600; font-size: 15px; text-decoration: none; }
.button:hover { background: #fffaf3; }

/* Index */
.intro { margin-bottom: 36px; }
.intro p { color: var(--soft); margin: 0; }
.posts { list-style: none; margin: 0; padding: 0; }
.posts li { padding: 24px 0; border-top: 1px solid var(--line); }
.posts h2 { font-size: 24px; margin: 0 0 8px; }
.posts h2 a { color: var(--text); text-decoration: none; }
.posts h2 a:hover { text-decoration: underline; text-decoration-color: var(--line-strong); }
.posts p { margin: 0 0 8px; color: var(--soft); }
.pager { display: flex; justify-content: space-between; gap: 16px; margin-top: 32px; font-size: 15px; }
.pager span { color: var(--muted); }
.empty { padding: 32px 24px; background: var(--surface); border: 1px solid var(--line); border-radius: 4px; }
.empty h2 { font-size: 24px; margin: 0 0 8px; }
.empty p { margin: 0 0 12px; color: var(--soft); }
.empty p:last-child { margin-bottom: 0; }

/* Footer */
.site-foot { border-top: 1px solid var(--line); font-size: 14px; color: var(--muted); }
.foot { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 22px; padding: 28px 16px; }
.foot a { color: var(--muted); text-decoration: none; }
.foot a:hover { color: var(--text); }
@media (max-width: 719px) { .foot a { display: inline-block; padding-block: 8px; } }