:root {
  --bg: #ffffff;
  --surface: #f6f6fb;
  --ink: #1b1b2a;
  --ink-soft: #55566a;
  --line: #e4e4ee;
  --brand: #4338ca;
  --brand-ink: #ffffff;
  --brand-soft: #eef0fd;
  --note: #fff7ed;
  --note-line: #f2c48d;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12121b;
    --surface: #1b1b28;
    --ink: #ececf4;
    --ink-soft: #a6a7b8;
    --line: #2e2e40;
    --brand: #a5a8f8;
    --brand-ink: #14142a;
    --brand-soft: #23244a;
    --note: #2b2118;
    --note-line: #7a5a33;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 16px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.8;
}
a { color: var(--brand); }
img { max-width: 100%; height: auto; }
.wrap { max-width: 720px; margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 8px; background: var(--bg); padding: 4px 12px; z-index: 2; }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }

.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 4px 20px; padding-top: 12px; padding-bottom: 12px; }
.brand { display: inline-flex; align-items: center; gap: 8px; color: var(--ink); font-weight: 650; text-decoration: none; }
.brand img { border-radius: 6px; }
.site-header nav { display: flex; flex-wrap: wrap; gap: 2px 16px; font-size: 15px; }
.site-header nav a { color: var(--ink-soft); text-decoration: none; }
.site-header nav a:hover { color: var(--brand); }
.site-header nav .to-site { color: var(--brand); font-weight: 600; }
.draft-bar { background: var(--note); border-bottom: 1px solid var(--note-line); font-size: 14px; padding: 6px 16px; text-align: center; }

.hero { padding: 44px 0 20px; }
.hero h1 { font-size: 32px; line-height: 1.3; margin: 0 0 12px; letter-spacing: -0.01em; }
.hero p { color: var(--ink-soft); margin: 0 0 12px; }
.hero.small { padding-top: 32px; }
.empty { color: var(--ink-soft); padding: 24px 0 48px; }

.post-list { list-style: none; margin: 0 0 40px; padding: 0; }
.post-card { border-top: 1px solid var(--line); }
.post-card a { display: block; padding: 20px 0; color: inherit; text-decoration: none; }
.post-card strong { display: block; font-size: 19px; line-height: 1.45; margin: 2px 0 6px; }
.post-card a:hover strong { color: var(--brand); }
.kicker { color: var(--brand); font-size: 13px; font-weight: 600; }
.desc { display: block; color: var(--ink-soft); font-size: 15px; line-height: 1.7; }
.post-card time { display: block; color: var(--ink-soft); font-size: 13px; margin-top: 6px; }

.post { padding-top: 24px; }
.crumbs { display: flex; gap: 6px; font-size: 14px; color: var(--ink-soft); }
.crumbs a { color: var(--ink-soft); text-decoration: none; }
.post h1 { font-size: 30px; line-height: 1.35; margin: 12px 0 8px; letter-spacing: -0.01em; }
.meta { display: flex; flex-wrap: wrap; gap: 0 14px; color: var(--ink-soft); font-size: 14px; margin: 0 0 20px; }
.lede { font-size: 18px; color: var(--ink-soft); margin: 0 0 24px; }
.toc { background: var(--surface); border-radius: 10px; padding: 14px 18px; margin: 0 0 28px; font-size: 15px; }
.toc p { font-weight: 600; margin: 0 0 4px; }
.toc ol { margin: 0; padding-left: 20px; }
.prose h2 { font-size: 23px; line-height: 1.4; margin: 40px 0 12px; }
.prose h3 { font-size: 19px; line-height: 1.4; margin: 28px 0 8px; }
.prose p { margin: 0 0 16px; }
.prose ul, .prose ol { margin: 0 0 16px; padding-left: 24px; }
.prose li { margin-bottom: 6px; }
.prose code { background: var(--surface); border-radius: 4px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.86em; padding: 1px 5px; overflow-wrap: anywhere; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }
.note { background: var(--note); border-left: 3px solid var(--note-line); border-radius: 0 8px 8px 0; margin: 20px 0; padding: 12px 16px; font-size: 15.5px; }
.note p { margin: 0; }
.table-wrap { overflow-x: auto; margin: 0 0 20px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; line-height: 1.6; }
th, td { border-bottom: 1px solid var(--line); padding: 9px 12px 9px 0; text-align: left; vertical-align: top; }
th { font-weight: 600; white-space: nowrap; }

.cta { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 24px; background: var(--brand-soft); border-radius: 12px; margin: 40px 0; padding: 20px; }
.cta p { margin: 2px 0 0; font-size: 15px; color: var(--ink-soft); }
.button { display: inline-block; background: var(--brand); border-radius: 8px; color: var(--brand-ink); font-size: 15px; font-weight: 600; padding: 8px 16px; text-decoration: none; white-space: nowrap; }
.button:hover { opacity: 0.9; }
.related h2 { font-size: 20px; margin: 0 0 8px; }

.site-footer { border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 13.5px; line-height: 1.7; padding: 20px 0 32px; }
.site-footer p { margin: 0 0 8px; }
.site-footer a { color: inherit; }

@media (max-width: 520px) {
  body { font-size: 16px; }
  .hero { padding-top: 28px; }
  .hero h1 { font-size: 26px; }
  .post h1 { font-size: 25px; }
  .prose h2 { font-size: 21px; }
}