/* Article-local additions; the existing blog owns typography and navigation. */
.zlib-essay {
  --zl-rust: #9d462e;
  --zl-blue: #315f7a;
  --zl-green: #585858;
  --zl-line: #d0d0d0;
  --zl-paper: #f8f8f8;
  --zl-muted: #626262;
  max-width: 1300px;
  grid-template-columns: minmax(0, 850px) 176px;
  gap: 64px;
}
.zlib-essay .article-body { max-width: 760px; }
.zlib-essay .article-hero h1 { font-size: clamp(64px, 8.2vw, 104px); }
.zlib-essay .article-hero p { max-width: 570px; }
.zlib-essay .article-body h2 { padding-top: 24px; margin-top: 100px; border-top: 1px dashed var(--zl-line); font-size: clamp(32px, 4vw, 46px); line-height: 1.4; }
.zlib-essay .article-body h3 { margin-top: 62px; font-size: 29px; line-height: 1.45; }
.zlib-essay .article-body p { text-align: left; overflow-wrap: anywhere; }
.zlib-essay .article-body h2,
.zlib-essay .article-body h3 { scroll-margin-top: 36px; }
.zlib-essay .article-body .zl-kicker { margin-bottom: 28px; color: var(--zl-rust); font-size: 12px; letter-spacing: .1em; }
.zlib-essay .article-body .zl-part-intro { color: var(--zl-muted); margin-top: 12px; margin-bottom: 38px; }
.zl-route { display: grid; grid-template-columns: 1fr 1fr; margin: 44px 0 64px; border-top: 1px solid var(--zl-line); border-bottom: 1px solid var(--zl-line); }
.zlib-essay .zl-route a { display: grid; gap: 8px; padding: 24px 12px 24px 0; text-decoration: none; }
.zlib-essay .zl-route a + a { padding-left: 24px; border-left: 1px dashed var(--zl-line); }
.zl-route span { font: 11px Menlo, monospace; color: var(--zl-rust); letter-spacing: .08em; }
.zl-route strong { font-size: 19px; font-weight: 500; }
.zl-route small { color: var(--zl-muted); font-size: 12px; }
.zlib-essay .zl-route a:hover strong { text-decoration: underline; text-underline-offset: 5px; }
.zl-layers { margin: 30px 0; }
.zl-layers > div { display: flex; align-items: stretch; gap: 3px; margin: 6px 0; min-height: 42px; font-size: 12px; }
.zl-layers > div > * { display: grid; align-content: center; padding: 9px 12px; }
.zl-layers > div > span { width: 54px; flex-shrink: 0; padding-left: 0; font-family: Menlo, monospace; }
.zl-layers b { flex: 1; text-align: center; border: 1px solid #b8b8b8; background: #e7e7e7; font-weight: 500; color: #444444; }
.zl-layers i { font-style: normal; background: #e6e6e6; }
.zlib-essay figcaption { display: block; font-size: 12px; line-height: 1.7; margin-top: 14px; color: var(--zl-muted); text-align: left; }
.zl-token-line { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 28px 0; font: 12px/1.7 Menlo, monospace; }
.zl-token-line > * { padding: 6px 12px; border: 1px solid var(--zl-line); background: var(--zl-paper); }
.zl-token-line b { border-color: #bf9485; color: var(--zl-rust); font-weight: 400; }
.zl-deep { margin: 28px 0; padding: 0 18px; border-left: 2px solid #a8a8a8; background: rgba(255,255,255,.3); }
.zl-deep summary { cursor: pointer; padding: 14px 0; font-size: 14px; font-weight: 500; }
.zl-deep summary:hover { color: var(--zl-rust); }
.zl-deep p { font-size: 15px; line-height: 1.85; padding-bottom: 14px; }
.zl-bit-order { padding: 22px; background: var(--zl-paper); border: 1px solid var(--zl-line); }
.zl-bit-order > div { display: flex; justify-content: space-between; gap: 12px; margin: 10px 0; font-size: 12px; }
.zl-bit-order b { font: 14px Menlo, monospace; color: var(--zl-blue); }
.zl-proof-chain { display: flex; justify-content: space-between; flex-wrap: wrap; align-items: center; gap: 12px; margin: 32px 0; padding: 24px 0; border-block: 1px dashed var(--zl-line); font-size: 13px; }
.zl-proof-chain i { font-style: normal; color: var(--zl-muted); font-size: 10px; }
.zl-proof-chain i::after { content: ' →'; }
.zlib-essay .article-body .zl-design-note { border-top: 1px dashed var(--zl-line); margin-top: 44px; padding-top: 22px; color: var(--zl-muted); font-size: 12px; }

zlib-demo { display: block; margin: 32px 0; border: 1px solid #c7c7c7; background: var(--zl-paper); border-radius: 5px; overflow: hidden; font-size: 14px; line-height: 1.6; }
.zl-demo-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px; padding: 16px 20px; border-bottom: 1px dashed var(--zl-line); }
.zl-demo-head > span:first-child { font-size: 10px; letter-spacing: .1em; color: var(--zl-muted); }
.zl-demo-head strong { font-size: 14px; font-weight: 500; }
.zl-demo-mark { margin-left: auto; color: var(--zl-rust); }
.zl-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; padding: 16px 20px; border-bottom: 1px solid #e3e3e3; }
.zl-controls label { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; color: #4c4c4c; font-size: 12px; }
.zl-controls select { font: inherit; background: #fff; border: 1px solid #c6c6c6; padding: 6px 25px 6px 8px; border-radius: 3px; color: #222; min-height: 34px; max-width: 100%; }
.zl-controls button { cursor: pointer; background: #262626; color: #fff; border: 1px solid #262626; border-radius: 3px; font: inherit; font-size: 12px; padding: 7px 12px; min-height: 34px; }
.zl-controls button:hover { background: #474747; }
.zl-controls button:disabled { cursor: default; opacity: .4; }
.zl-controls button.zl-quiet { background: transparent; color: #454545; border-color: #c6c6c6; }
.zl-controls button.zl-quiet:hover { background: #eaeaea; }
.zl-controls .zl-scrub { flex: 1 1 180px; gap: 10px; }
.zl-controls input[type=range] { flex: 1; min-width: 75px; width: 130px; accent-color: var(--zl-rust); cursor: pointer; }
.zl-controls :is(button,select,input):focus-visible,
.zl-deep summary:focus-visible { outline: 2px solid var(--zl-blue); outline-offset: 3px; }
.zl-view { padding: 22px 20px; min-height: 160px; }
.zl-status { display: block; padding: 14px 20px; background: #efefef; border-top: 1px dashed var(--zl-line); font-size: 12px; color: #4e4e4e; min-height: 49px; }
.zl-error .zl-status { background: #f7e8e2; color: #8d3d29; }
.zl-label-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 18px; color: var(--zl-muted); font-size: 11px; }
.zlib-essay zlib-demo code { background: transparent; padding: 0; border: 0; font-size: 12px; }
.zl-bytes { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 6px; }
.zl-cell { position: relative; display: grid; place-content: center; aspect-ratio: 1; max-height: 72px; background: #e7e7e7; border: 1px solid #b8b8b8; color: #454545; text-align: center; border-radius: 3px; }
.zl-cell b { font: 25px var(--nan-serif), serif; font-weight: 400; }
.zl-cell small { font: 9px Menlo, monospace; color: #757575; position: absolute; bottom: 4px; right: 5px; }
.zl-cell.zl-empty { color: #b4b4b4; background: transparent; border: 1px dashed #cdcdcd; }
.zl-cell.zl-new { background: #e8c6b9; border-color: #b5735c; color: #743d29; animation: zl-arrive 350ms ease-out both; }
.zl-readwrite { display: flex; flex-wrap: wrap; gap: 12px 24px; font-size: 11px; margin: 18px 0; color: #555555; }
.zl-dot { display: inline-block; width: 7px; height: 7px; margin-right: 5px; border-radius: 50%; background: var(--zl-green); }
.zl-dot-blue { background: var(--zl-blue); }
.zl-operation { padding: 14px 0; font: 13px/1.7 Menlo, monospace; color: #545454; overflow-wrap: anywhere; }
.zl-operation b { color: var(--zl-rust); font-weight: 400; }
.zlib-essay .article-body .zl-mini { font-size: 11px; line-height: 1.7; color: var(--zl-muted); margin: 10px 0 0; }
.zl-sequence { display: flex; align-items: center; justify-content: space-around; gap: 12px; margin: 20px 0; }
.zlib-essay .zl-sequence code { letter-spacing: .12em; font-size: 19px; }
.zl-sequence .zl-current { color: var(--zl-rust); }
.zl-candidates { display: grid; gap: 8px; }
.zl-candidates > div { display: grid; grid-template-columns: 110px 1fr 110px; align-items: center; gap: 8px; padding: 12px; border: 1px dashed var(--zl-line); font-size: 11px; }
.zl-candidates b { font-weight: 400; text-align: right; }
.zl-candidates .visited { border-style: solid; background: #eaeaea; border-color: #b8b8b8; }
.zl-tree { display: block; width: 100%; max-height: 245px; margin: 20px 0; overflow: visible; }
.zl-tree path { fill: none; stroke: #b5b5b5; stroke-width: 1.5; }
.zl-tree text { font: 12px Menlo, monospace; fill: #7c7c7c; }
.zl-tree circle { fill: #838383; }
.zl-tree circle.leaf { fill: #e8c6b9; stroke: #af755d; stroke-width: 1; }
.zl-tree text.leaf-label { fill: #653c2c; }
.zl-code-list { display: grid; grid-template-columns: repeat(4,1fr); gap: 6px; }
.zl-code-list > div { display: grid; text-align: center; gap: 8px; padding: 12px 0; border-top: 1px solid var(--zl-line); }
.zl-code-list span { font-family: var(--nan-serif), serif; font-size: 22px; }
.zl-code-list b { font: 17px Menlo, monospace; color: var(--zl-rust); }
.zl-code-list small { font-size: 10px; color: var(--zl-muted); }
.zl-invalid { display: grid; place-items: center; text-align: center; padding: 40px 20px; color: var(--zl-rust); min-height: 240px; }
.zl-invalid > span { font-size: 36px; }
.zl-invalid p { font-size: 13px; }
.zl-lookup-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 26px; }
.zl-lookup-top div { display: grid; gap: 8px; text-align: center; }
.zl-lookup-top small { font-size: 10px; color: var(--zl-muted); }
.zl-lookup-top b { font: 26px Menlo, monospace; color: var(--zl-blue); }
.zl-tables { display: grid; grid-template-columns: 1.2fr 1fr; gap: 24px; }
.zlib-essay .zl-tables table { width: 100%; margin: 0; border-collapse: collapse; font-size: 12px; }
.zl-tables caption { text-align: left; padding-bottom: 10px; color: var(--zl-muted); font-size: 11px; }
.zlib-essay .zl-tables th,
.zlib-essay .zl-tables td { padding: 8px 10px; border: 1px solid #dddddd; text-align: left; }
.zlib-essay .zl-tables th { font-size: 10px; font-weight: 400; color: #636363; }
.zl-tables .selected { background: #e8c6b9; color: #673c2a; }
.zl-registers { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); margin: 22px 0 12px; gap: 16px; }
.zl-registers > div { display: grid; gap: 6px; padding-top: 12px; border-top: 1px dashed var(--zl-line); }
.zl-registers small { font-size: 10px; color: var(--zl-muted); }
.zl-registers b { font: 18px/1.5 Menlo, monospace; color: var(--zl-blue); overflow-wrap: anywhere; }
.zl-call-log { margin-top: 20px; }
.zl-call-log > div { display: flex; align-items: baseline; gap: 20px; padding: 10px 0; border-top: 1px solid #e1e1e1; font-size: 12px; animation: zl-arrive 250ms ease-out; }
.zl-call-log small { font: 10px Menlo, monospace; color: var(--zl-muted); flex-shrink: 0; }
.zl-memory { display: grid; grid-template-columns: repeat(16,minmax(0,1fr)); gap: 3px; }
.zl-memory > span { aspect-ratio: .8; display: grid; align-content: space-between; text-align: center; padding: 3px 0; border: 1px solid #d2d2d2; border-radius: 2px; overflow: hidden; }
.zl-memory small { font: 8px Menlo, monospace; opacity: .65; }
.zl-memory b { font: 10px Menlo, monospace; min-height: 15px; }
.zl-memory .free { color: #7e7e7e; background: #f1f1f1; }
.zl-memory .written, .zl-legend .written { background: #c7d9df; border-color: #a0b9c4; color: #31576b; }
.zl-memory .unread, .zl-legend .unread { background: #e3e3e3; border-color: #bdbdbd; color: #626262; }
.zl-memory .corrupt, .zl-legend .corrupt { background: #e8b3a2; border-color: #ba7860; color: #833e27; }
.zl-legend { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 15px; font-size: 10px; color: #646464; }
.zl-legend i { display: inline-block; width: 9px; height: 9px; margin-right: 5px; border: 1px solid; }
.zl-owned { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; }
.zl-owned > div { display: grid; gap: 10px; padding: 18px 12px; text-align: center; border: 1px dashed var(--zl-line); border-radius: 3px; }
.zl-owned small { font-size: 10px; color: var(--zl-muted); }
.zl-owned b { font: 18px var(--nan-serif), serif; }
.zl-owned span { font-size: 10px; color: var(--zl-muted); }
.zl-owned .live { background: #e8e8e8; border: 1px solid #b7b7b7; }
.zl-owned .background { background: #ebebeb; }
@keyframes zl-arrive { from { opacity: .35; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 1100px) {
  .zlib-essay { display: block; max-width: 900px; }
  .zlib-essay .article-body { max-width: 100%; }
  .zlib-essay .toc-sidebar { display: none; }
}
@media (max-width: 620px) {
  .zlib-essay { padding: 24px 18px; }
  .zlib-essay .article-hero h1 { font-size: 68px; }
  .zlib-essay .article-body { font-size: 16px; }
  .zlib-essay .article-body h2 { margin-top: 70px; font-size: 30px; }
  .zlib-essay .article-body h3 { font-size: 25px; }
  .zl-route { grid-template-columns: 1fr; margin: 30px 0 44px; }
  .zlib-essay .zl-route a + a { border-left: 0; border-top: 1px dashed var(--zl-line); padding-left: 0; }
  .zl-layers > div { font-size: 10px; }
  .zl-layers > div > * { padding: 7px 6px; }
  .zl-layers > div > span { width: 34px; }
  .zl-demo-head, .zl-controls, .zl-view { padding: 15px 12px; }
  .zl-status { padding: 12px; }
  .zl-label-row { flex-wrap: wrap; }
  .zl-bytes { gap: 3px; }
  .zl-cell b { font-size: 22px; }
  .zl-cell small { font-size: 7px; bottom: 1px; right: 2px; }
  .zlib-essay .zl-sequence code { font-size: 14px; letter-spacing: .03em; }
  .zl-candidates > div { grid-template-columns: 75px 1fr; }
  .zl-candidates b { grid-column: 2; text-align: left; }
  .zl-lookup-top { gap: 5px; }
  .zl-lookup-top small { font-size: 8px; }
  .zl-tables { grid-template-columns: 1fr; gap: 18px; }
  .zl-registers { gap: 7px; }
  .zl-registers b { font-size: 14px; }
  .zl-memory { grid-template-columns: repeat(8,minmax(0,1fr)); }
  .zl-memory > span { aspect-ratio: 1.2; }
  .zl-owned { gap: 5px; }
  .zl-owned > div { padding: 14px 4px; }
  .zl-owned b { font-size: 16px; }
  .zl-owned span { font-size: 9px; }
  .zl-proof-chain { justify-content: flex-start; }
}
@media (prefers-reduced-motion: reduce) {
  .zlib-essay *, .zlib-essay *::before, .zlib-essay *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}
@media print {
  .zl-controls { display: none; }
  zlib-demo { break-inside: avoid; }
  .zl-deep { break-inside: avoid; }
}