:root {
  --ink: #1f2733;
  --muted: #5c6673;
  --line: #e7ecf2;
  --brand: #5468ff;
  --brand-deep: #3d4fe0;
  --bg: #ffffff;
  --soft: #f6f8fc;
  --maxw: 760px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 18px;
}
a { color: var(--brand-deep); }
img { max-width: 100%; height: auto; }

.site-header {
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; background: rgba(255,255,255,.92); backdrop-filter: blur(6px); z-index: 5;
}
.nav {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}
.brand { font-weight: 800; font-size: 20px; text-decoration: none; color: var(--ink); }
.brand span { color: var(--brand); }
.nav a.link { text-decoration: none; color: var(--muted); font-weight: 600; font-size: 15px; }
.nav a.link:hover { color: var(--ink); }
.nav .spacer { flex: 1; }
.nav .cta {
  text-decoration: none; background: var(--brand); color: #fff; font-weight: 700; font-size: 14px;
  padding: 8px 14px; border-radius: 10px;
}

main { max-width: var(--maxw); margin: 0 auto; padding: 28px 20px 60px; }
.crumbs { font-size: 13px; color: var(--muted); margin-bottom: 18px; }
.crumbs a { color: var(--muted); text-decoration: none; }

h1 { font-size: clamp(28px, 5vw, 40px); line-height: 1.2; margin: 6px 0 14px; }
h2 { font-size: clamp(22px, 4vw, 28px); margin: 38px 0 12px; }
h3 { font-size: 20px; margin: 26px 0 8px; }
p { margin: 0 0 16px; }
ul, ol { margin: 0 0 16px; padding-left: 22px; }
li { margin-bottom: 8px; }

.meta { color: var(--muted); font-size: 15px; margin-bottom: 22px; }
.lede { font-size: 20px; color: #33404f; }

.quick-answer {
  background: var(--soft); border: 1px solid var(--line); border-left: 4px solid var(--brand);
  border-radius: 12px; padding: 18px 20px; margin: 24px 0;
}
.quick-answer h2 { margin-top: 0; }

.toc { background: var(--soft); border: 1px solid var(--line); border-radius: 12px; padding: 18px 22px; margin: 24px 0; }
.toc h2 { margin: 0 0 10px; font-size: 20px; }
.toc ol { margin: 0; }

figure { margin: 24px 0; }
figure img { border-radius: 12px; border: 1px solid var(--line); width: 100%; display: block; }
figcaption { font-size: 14px; color: var(--muted); margin-top: 8px; text-align: center; }

table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 15px; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; }
th { background: var(--soft); }

.callout {
  background: #eef1ff; border: 1px solid #dfe4ff; border-radius: 12px; padding: 16px 18px; margin: 22px 0;
}
.callout a { font-weight: 700; }

.faq h3 { margin-top: 22px; }
.author-box {
  display: flex; gap: 14px; align-items: flex-start; background: var(--soft);
  border: 1px solid var(--line); border-radius: 14px; padding: 18px; margin: 34px 0 10px;
}
.author-box .ab-emoji { font-size: 34px; }
.author-box p { margin: 4px 0 0; font-size: 15px; color: var(--muted); }
.author-box b { font-size: 16px; color: var(--ink); }

.post-card { border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px; margin: 16px 0; }
.post-card h2 { margin: 0 0 6px; font-size: 22px; }
.post-card a { text-decoration: none; }
.post-card p { color: var(--muted); margin: 0; }

footer { border-top: 1px solid var(--line); }
.foot { max-width: var(--maxw); margin: 0 auto; padding: 24px 20px; color: var(--muted); font-size: 14px; display: flex; gap: 16px; flex-wrap: wrap; }
.foot a { color: var(--muted); text-decoration: none; }