:root {
  --bg: #faf9f6;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --border: #e3e0d8;
  --code-bg: #f0ede4;
  --link: #6b4d1a;
  --link-hov: #c9a14b;
  --accent: #ffd633;
  --chip-bg: #ede9dd;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0c0a;
    --fg: #ece8db;
    --muted: #8a8576;
    --border: #2a2620;
    --code-bg: #1a1814;
    --link: #d4b46a;
    --link-hov: #ffd633;
    --accent: #ffd633;
    --chip-bg: #1f1c15;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hov); text-decoration: underline; }
code, pre {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
}
pre { background: var(--code-bg); padding: 14px 18px; overflow-x: auto; border-radius: 6px; }
.bp-hdr {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 28px; border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky; top: 0; z-index: 10;
}
.bp-logo { font-weight: 800; font-size: 18px; letter-spacing: -0.5px; color: var(--fg); }
.bp-logo:hover { color: var(--link-hov); text-decoration: none; }
.bp-nav a { margin-left: 18px; color: var(--muted); font-size: 14px; }
.bp-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 28px 80px;
}
.bp-ftr {
  text-align: center; padding: 22px; color: var(--muted); font-size: 13px;
  border-top: 1px solid var(--border);
}
.bp-ftr-sep { margin: 0 8px; color: var(--border); }
.bp-ftr a { color: var(--muted); }
.bp-ftr a:hover { color: var(--link-hov); }
h1 { font-size: 32px; font-weight: 700; margin: 0 0 6px; letter-spacing: -0.7px; }
h2 { font-size: 20px; font-weight: 700; margin: 36px 0 14px; letter-spacing: -0.3px; }
.bp-lede { font-size: 17px; color: var(--muted); margin: 0 0 8px; max-width: 720px; }
.bp-meta { color: var(--muted); font-size: 14px; margin: 4px 0 18px; }
.bp-cards { list-style: none; padding: 0; display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.bp-card {
  border: 1px solid var(--border); border-radius: 10px; padding: 18px 20px;
  background: var(--code-bg);
}
.bp-card a h2 { margin: 0 0 6px; color: var(--fg); }
.bp-card a:hover h2 { color: var(--link-hov); }
.bp-card p { margin: 4px 0; color: var(--muted); font-size: 14px; }
.bp-section { margin-top: 38px; }
.bp-q {
  width: 100%; padding: 10px 14px; font-size: 15px;
  border: 1px solid var(--border); border-radius: 6px; background: var(--bg); color: var(--fg);
}
.bp-q:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.bp-commits { list-style: none; padding: 0; margin: 14px 0; }
.bp-commits li {
  display: grid; grid-template-columns: 80px 100px 1fr; gap: 12px; align-items: baseline;
  padding: 8px 12px; border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.bp-commits li:hover { background: var(--code-bg); }
.bp-commits li:target { background: var(--chip-bg); outline: 2px solid var(--accent); outline-offset: -2px; }
.bp-commits code { background: var(--code-bg); padding: 2px 6px; border-radius: 4px; }
.bp-d { color: var(--muted); font-variant-numeric: tabular-nums; }
.bp-s { color: var(--fg); }
.bp-grid { display: grid; gap: 28px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.bp-chips { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.bp-chips li {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; background: var(--chip-bg); border-radius: 999px;
  font-size: 13px;
}
.bp-chips li span { color: var(--fg); }
.bp-chips li b { color: var(--muted); font-weight: 600; }
.bp-idea {
  border: 1px solid var(--border); border-radius: 6px; margin: 10px 0;
  padding: 10px 14px; background: var(--code-bg);
}
.bp-idea summary { cursor: pointer; font-size: 14px; }
.bp-idea pre { background: transparent; padding: 10px 0 0; font-size: 13px; white-space: pre-wrap; }
.bp-h { color: var(--link); font-weight: 700; }
.bp-files { columns: 2; column-gap: 28px; list-style: none; padding: 0; font-size: 13px; }
.bp-files li { break-inside: avoid; padding: 2px 0; }
.bp-files code { background: transparent; }
.bp-body { margin: 20px 0; }
.bp-body pre { background: var(--code-bg); white-space: pre-wrap; }
.bp-diff { font-size: 12px; max-height: 70vh; overflow: auto; }
.bp-spark { font-family: ui-monospace, Menlo, monospace; letter-spacing: 1px; color: var(--link); background: var(--code-bg); padding: 1px 6px; border-radius: 4px; }
.bp-delta { font-family: ui-monospace, Menlo, monospace; font-size: 12px; padding: 1px 6px; border-radius: 4px; font-weight: 600; }
.bp-delta-up { color: #1f7a30; background: rgba(31,122,48,0.12); }
.bp-delta-dn { color: #b14747; background: rgba(177,71,71,0.12); }
.bp-delta-eq { color: var(--muted);  background: var(--chip-bg); }
.bp-today { color: #1f7a30; background: rgba(31,122,48,0.10); padding: 1px 6px; border-radius: 4px; font-size: 12px; font-weight: 600; }
@media (prefers-color-scheme: dark) { .bp-today { color: #5cd278; } }
@media (prefers-color-scheme: dark) {
  .bp-delta-up { color: #5cd278; }
  .bp-delta-dn { color: #ff7373; }
}
.bp-load { font-family: ui-monospace, Menlo, monospace; padding: 1px 6px; border-radius: 4px; font-weight: 600; }
.bp-load-ok   { background: rgba(31,122,48,0.15);  color: #1f7a30; }
.bp-load-warn { background: rgba(196,140,30,0.18); color: #9b6f15; }
.bp-load-hot  { background: rgba(177,71,71,0.18);  color: #b14747; }
@media (prefers-color-scheme: dark) {
  .bp-load-ok   { color: #5cd278; }
  .bp-load-warn { color: #ffc857; }
  .bp-load-hot  { color: #ff7373; }
}
.bp-d-add { color: #1f7a30; background: rgba(31,122,48,0.08); display: block; }
.bp-d-rm  { color: #b14747; background: rgba(177,71,71,0.08); display: block; }
.bp-d-h   { color: var(--muted); font-weight: 600; display: block; }
.bp-d-h2  { color: var(--link); display: block; }
@media (prefers-color-scheme: dark) {
  .bp-d-add { color: #5cd278; background: rgba(92,210,120,0.12); }
  .bp-d-rm  { color: #ff7373; background: rgba(255,115,115,0.12); }
}
.bp-source { font-size: 12px; max-height: 80vh; overflow: auto; white-space: pre; }
@media (max-width: 640px) {
  .bp-commits li { grid-template-columns: 1fr; gap: 2px; }
  .bp-files { columns: 1; }
}