:root {
  --bg:#0b0f14; --ink-2:#10161e; --ink-3:#161d27;
  --line:#1f2935; --text:#e6edf3; --text-2:#9aa6b2; --dim:#6b7785;
  --cyan:#5ad1ff; --amber:#f3c969; --good:#4ade80; --bad:#f87171;
  --display:'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --body:-apple-system, system-ui, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html, body { background: var(--bg); color: var(--text); font-family: var(--body); margin: 0; }
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
.hdr {
  display:flex; justify-content:space-between; align-items:center;
  padding: 18px 28px; border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--ink-2), transparent);
  font-family: var(--display);
}
.hdr .brand { color: var(--text); font-weight: 600; letter-spacing: 0.04em; }
.hdr nav a { margin-left: 14px; color: var(--text-2); font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; }
.hdr nav a:hover { color: var(--cyan); }
main { max-width: 760px; margin: 0 auto; padding: 32px 28px 64px; }
.meta { color: var(--text-2); font-family: var(--display); font-size: 12px; letter-spacing: 0.08em;
  text-transform: uppercase; margin-bottom: 18px; border-bottom: 1px solid var(--line); padding-bottom: 12px; }
.meta .tag { color: var(--cyan); margin-left: 6px; text-decoration: none; }
.meta .tag:hover { color: var(--amber); text-decoration: underline; }
.meta .author { color: var(--amber); }
.copy-md {
  display: inline-flex; align-items: center; justify-content: center;
  vertical-align: middle; margin-left: 10px;
  width: 28px; height: 28px; padding: 0;
  background: transparent; color: var(--text-2);
  border: 1px solid var(--line); border-radius: 6px;
  cursor: pointer; line-height: 0;
  transition: color .15s, border-color .15s, background .15s;
}
.copy-md:hover { color: var(--cyan); border-color: var(--cyan); }
.copy-md:focus-visible { outline: none; color: var(--cyan); border-color: var(--cyan); }
.copy-md.ok  { color: var(--good); border-color: var(--good); }
.copy-md.err { color: var(--bad);  border-color: var(--bad);  }
.copy-md svg { display: block; }
h1 .copy-md { position: relative; top: -2px; }
h1, h2, h3 { font-family: var(--display); letter-spacing: 0.01em; line-height: 1.25; }
h1 { font-size: 1.85rem; margin: 0 0 18px; }
h2 { font-size: 1.35rem; margin: 28px 0 12px; color: var(--text); border-left: 3px solid var(--cyan); padding-left: 10px; }
h3 { font-size: 1.1rem; margin: 22px 0 10px; color: var(--text-2); }
p, li { line-height: 1.65; font-size: 1.02rem; }
hr { border: none; border-top: 1px solid var(--line); margin: 28px 0; }
code { background: var(--ink-3); padding: 2px 6px; border-radius: 4px; font-family: var(--display); font-size: 0.92em; color: var(--amber); }
pre { background: var(--ink-3); padding: 14px 16px; border-radius: 8px; overflow-x: auto; border: 1px solid var(--line); }
pre code { background: transparent; padding: 0; color: var(--text); }
blockquote { border-left: 3px solid var(--amber); padding: 6px 14px; margin: 18px 0; color: var(--text-2); background: var(--ink-2); border-radius: 0 6px 6px 0; }
.field-signal { scroll-margin-top: 24px; transition: background .35s, box-shadow .35s; }
.field-signal:target { background: rgba(243,201,105,.09); box-shadow: -8px 0 0 rgba(243,201,105,.8); }
table { border-collapse: collapse; width: 100%; margin: 18px 0; }
th, td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
th { background: var(--ink-2); font-family: var(--display); font-size: 0.9rem; }
img { max-width: 100%; border-radius: 6px; }
.ft { padding: 20px 28px; border-top: 1px solid var(--line); color: var(--text-2);
  display: flex; justify-content: space-between; font-family: var(--display); font-size: 12px; }
.ft .dim { color: var(--dim); }
/* Index listing */
.index-list { list-style: none; padding: 0; margin: 0; }
.index-list li { padding: 18px 0; border-bottom: 1px solid var(--line); }
.index-list li:last-child { border-bottom: none; }
.index-list h2 { margin: 0 0 6px; border: none; padding: 0; font-size: 1.2rem; }
.index-list h2 a { color: var(--text); }
.index-list h2 a:hover { color: var(--cyan); }
.index-list .summary { color: var(--text-2); margin: 6px 0 4px; font-size: 0.98rem; }
.index-list .meta { border: none; padding: 0; margin: 4px 0 0; }
.tagline { color: var(--text-2); margin-top: -6px; margin-bottom: 24px; font-family: var(--display); font-size: 13px; letter-spacing: 0.05em; }
.empty { color: var(--dim); padding: 40px 0; text-align: center; font-family: var(--display); }
/* Tag filter bar (index) */
.filter-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  padding: 10px 12px; margin: 0 0 20px; border: 1px solid var(--line);
  border-radius: 8px; background: var(--ink-2); font-family: var(--display); font-size: 12px; }
.filter-bar .filter-link { color: var(--text-2); padding: 4px 9px; border-radius: 999px;
  border: 1px solid transparent; letter-spacing: 0.04em; text-decoration: none; }
.filter-bar .filter-link:hover { color: var(--cyan); border-color: var(--line); }
.filter-bar .filter-link.active { color: var(--bg); background: var(--cyan); border-color: var(--cyan); }
.filter-bar .filter-all { color: var(--dim); text-transform: uppercase; }
.filter-bar .filter-all.active { color: var(--bg); background: var(--text-2); border-color: var(--text-2); }
.filter-bar .filter-count { margin-left: auto; color: var(--dim); font-size: 11px; letter-spacing: 0.08em; }
.index-list .meta .tag { color: var(--cyan); margin-left: 4px; text-decoration: none; font-size: 11px; }
.index-list .meta .tag:hover { color: var(--amber); text-decoration: underline; }
@media (max-width: 580px) {
  html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
  body { overflow-x: hidden; }
  .hdr { padding: 8px 14px; }
  .hdr .brand, .hdr nav a { display: inline-flex; align-items: center; min-height: 44px; }
  .hdr nav { display: flex; align-items: center; }
  .hdr nav a { justify-content: center; min-width: 44px; margin-left: 0; padding: 0 4px; font-size: 11px; }
  main { min-width: 0; padding: 24px 16px 48px; }
  main a { overflow-wrap: anywhere; }
  .meta { line-height: 1.6; letter-spacing: .05em; }
  .meta .tag { display: inline-flex; align-items: center; min-height: 36px; margin-left: 2px; padding: 0 3px; }
  h1 { font-size: clamp(1.45rem, 7.5vw, 1.75rem); overflow-wrap: anywhere; }
  h2 { font-size: 1.2rem; }
  p, li { font-size: 1rem; }
  ul, ol { padding-left: 24px; }
  .copy-md { width: 44px; height: 44px; margin-left: 4px; }
  blockquote { margin-right: 0; margin-left: 0; }
  pre { max-width: 100%; padding: 12px; }
  table { display: block; max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .field-signal { scroll-margin-top: 12px; padding-right: 2px; }
  .ft { flex-direction: column; gap: 7px; padding: 18px 14px max(18px, env(safe-area-inset-bottom)); }
}