@view-transition { navigation: auto; }

:root {
  color-scheme: dark;
  --bg: #0b0b0b;
  --panel: #131313;
  --panel-2: #1a1a1a;
  --line: #272727;
  --line-2: #3a3a3a;
  --text: #e7e7e4;
  --dim: #a6a6a1;
  --amber: #f2a900;
  --amber-dim: #3a2c06;
  --live: #7bd88f;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --sans: "IBM Plex Sans", system-ui, sans-serif;
  --ease: cubic-bezier(.25, .8, .25, 1);
  --side: 18rem;
}

* { box-sizing: border-box; }
html { font-size: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--sans); font-size: 1.0625rem; line-height: 1.55; overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, textarea, select { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }
.mono { font-family: var(--mono); }
.skip { position: absolute; left: -999px; background: var(--amber); color: #000; padding: .5rem 1rem; font-size: 1rem; }
.skip:focus { left: 1rem; top: 1rem; z-index: 50; }

/* Page frame: sidebar index and main column */
.shell { display: grid; grid-template-columns: 1fr; min-height: 100vh; }
@media (min-width: 62rem) { .shell { grid-template-columns: var(--side) minmax(0, 1fr); } }
.side { border-bottom: 1px solid var(--line); background: var(--bg); position: sticky; top: 0; z-index: 20; }
@media (min-width: 62rem) { .side { border-bottom: 0; border-right: 1px solid var(--line); height: 100vh; overflow-y: auto; } }
.side-top { display: flex; align-items: center; justify-content: space-between; padding: .9rem 1rem; }
@media (min-width: 62rem) { .side-top { display: block; padding: 1.5rem 1.5rem 1rem; } }
.id-name { font-family: var(--mono); font-weight: 600; font-size: 1.25rem; letter-spacing: -.01em; display: block; }
.id-role { color: var(--dim); font-size: 1rem; margin: .25rem 0 0; display: none; }
@media (min-width: 62rem) { .id-role { display: block; } }
.menu-btn { background: none; border: 1px solid var(--line-2); padding: .4rem .75rem; font-family: var(--mono); font-size: 1rem; cursor: pointer; transition: border-color .2s var(--ease), background .2s var(--ease); }
.menu-btn:hover { border-color: var(--amber); }
@media (min-width: 62rem) { .menu-btn { display: none; } }
.side-nav { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .4s var(--ease); }
.side-nav > div { overflow: hidden; }
.side.open .side-nav { grid-template-rows: 1fr; }
@media (min-width: 62rem) { .side-nav { grid-template-rows: 1fr; } }
.side-nav nav { padding: 0 1rem 1rem; }
@media (min-width: 62rem) { .side-nav nav { padding: .5rem 1.5rem 1.5rem; } }
.side-label { font-family: var(--mono); font-size: 1rem; color: var(--dim); margin: 1rem 0 .4rem; }
.side-nav a { display: flex; justify-content: space-between; gap: .5rem; padding: .4rem .6rem; margin: 0 -.6rem; border-left: 2px solid transparent; font-family: var(--mono); font-size: 1rem; transition: background .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease); }
.side-nav a:hover { background: var(--panel); border-color: var(--line-2); }
.side-nav a[aria-current="page"] { border-color: var(--amber); color: var(--amber); background: var(--panel); }
.side-nav a span { color: var(--dim); }
.side-foot { font-family: var(--mono); font-size: 1rem; color: var(--dim); border-top: 1px solid var(--line); padding-top: 1rem; margin-top: 1rem; overflow-wrap: anywhere; }
.side-foot a:hover { color: var(--amber); }

.main { min-width: 0; }
.pad { padding: 1.25rem 1rem 3rem; }
@media (min-width: 48rem) { .pad { padding: 2rem 2.25rem 4rem; } }
.docbar { display: flex; flex-wrap: wrap; gap: .25rem 1.5rem; font-family: var(--mono); font-size: 1rem; color: var(--dim); border-bottom: 1px solid var(--line); padding: .75rem 1rem; }
@media (min-width: 48rem) { .docbar { padding: .75rem 2.25rem; } }
.docbar b { color: var(--text); font-weight: 500; }

h1, h2, h3 { margin: 0; font-weight: 600; line-height: 1.15; letter-spacing: -.01em; }
.h1 { font-size: clamp(2rem, 4.2vw, 3.3rem); }
.h2 { font-size: 1.5rem; }
.h3 { font-size: 1.15rem; }
.sec-title { display: flex; align-items: baseline; gap: .75rem; border-bottom: 1px solid var(--line-2); padding-bottom: .5rem; margin: 2.5rem 0 1rem; font-family: var(--mono); font-size: 1.125rem; font-weight: 600; }
.sec-title .n { color: var(--amber); }
.lede { color: var(--dim); font-size: 1.1875rem; max-width: 46rem; margin: .75rem 0 0; }

/* Readouts */
.readouts { display: grid; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 1.5rem; }
.readout { background: var(--panel); padding: 1rem; position: relative; overflow: hidden; }
.readout b { display: block; font-family: var(--mono); font-size: 2.25rem; font-weight: 500; color: var(--amber); line-height: 1.1; }
.readout span { display: block; color: var(--dim); font-size: 1rem; margin-top: .3rem; }
.readout::after { content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 100%; background: var(--amber); transform: scaleX(0); transform-origin: left; transition: transform 1.2s var(--ease); }
.readout.in::after { transform: scaleX(1); }

/* Test bench: tabbed live tools */
.bench { border: 1px solid var(--line-2); background: var(--panel); }
.bench-tabs { display: flex; overflow-x: auto; border-bottom: 1px solid var(--line-2); }
.bench-tabs button { flex: none; background: none; border: 0; border-right: 1px solid var(--line); padding: .7rem 1rem; font-family: var(--mono); font-size: 1rem; color: var(--dim); cursor: pointer; position: relative; transition: color .2s var(--ease), background .2s var(--ease); }
.bench-tabs button::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--amber); transform: scaleX(0); transition: transform .3s var(--ease); }
.bench-tabs button:hover { color: var(--text); background: var(--panel-2); }
.bench-tabs button[aria-selected="true"] { color: var(--amber); }
.bench-tabs button[aria-selected="true"]::after { transform: scaleX(1); }
.bench-meta { display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem 1rem; padding: .6rem 1rem; font-family: var(--mono); font-size: 1rem; color: var(--dim); border-bottom: 1px solid var(--line); }
.bench-meta a { color: var(--text); border-bottom: 1px solid var(--line-2); transition: border-color .2s var(--ease), color .2s var(--ease); }
.bench-meta a:hover { color: var(--amber); border-color: var(--amber); }
.dot { display: inline-block; width: .6rem; height: .6rem; border-radius: 50%; background: var(--live); margin-right: .45rem; box-shadow: 0 0 0 0 rgba(123, 216, 143, .6); animation: pulse 2s infinite; }
@keyframes pulse { 70% { box-shadow: 0 0 0 .5rem rgba(123, 216, 143, 0); } 100% { box-shadow: 0 0 0 0 rgba(123, 216, 143, 0); } }
.bench-stage { position: relative; height: min(74vh, 44rem); background: #fff; }
.bench-stage iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; transition: opacity .45s var(--ease); }
.bench-stage iframe.fading { opacity: 0; }

/* Parts table */
.controls { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin-bottom: 1rem; }
.controls input { background: var(--panel); border: 1px solid var(--line-2); padding: .55rem .75rem; font-family: var(--mono); font-size: 1rem; min-width: 0; flex: 1 1 14rem; transition: border-color .2s var(--ease); }
.controls input:focus { outline: none; border-color: var(--amber); }
.chip { background: var(--panel); border: 1px solid var(--line-2); padding: .45rem .7rem; font-family: var(--mono); font-size: 1rem; cursor: pointer; transition: background .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease); }
.chip:hover { border-color: var(--dim); }
.chip[aria-pressed="true"] { background: var(--amber); border-color: var(--amber); color: #000; }
.parts { width: 100%; border-collapse: collapse; font-size: 1rem; }
.parts th { text-align: left; font-family: var(--mono); font-weight: 500; color: var(--dim); border-bottom: 1px solid var(--line-2); padding: .55rem .6rem; white-space: nowrap; }
.parts th button { background: none; border: 0; padding: 0; cursor: pointer; color: inherit; font-family: var(--mono); font-size: 1rem; transition: color .2s var(--ease); }
.parts th button:hover, .parts th button[data-dir] { color: var(--amber); }
.parts th button[data-dir="asc"]::after { content: " \2191"; }
.parts th button[data-dir="desc"]::after { content: " \2193"; }
.parts td { border-bottom: 1px solid var(--line); padding: .7rem .6rem; vertical-align: top; }
.parts tr.row { transition: background .2s var(--ease), opacity .3s var(--ease); }
.parts tr.row:hover { background: var(--panel); }
.parts .pn { font-family: var(--mono); color: var(--amber); white-space: nowrap; }
.parts .nm a { font-weight: 600; transition: color .2s var(--ease); }
.parts .nm a:hover { color: var(--amber); }
.parts .nm p { margin: .2rem 0 0; color: var(--dim); }
.parts .ct, .parts .st { font-family: var(--mono); white-space: nowrap; }
.parts .mt b { font-family: var(--mono); font-weight: 500; color: var(--text); }
.parts .mt span { color: var(--dim); display: block; }
.live-tag { font-family: var(--mono); font-size: 1rem; color: var(--live); white-space: nowrap; }
.parts tr.hide { display: none; }
@media (max-width: 52rem) {
  .parts thead { display: none; }
  .parts, .parts tbody, .parts tr, .parts td { display: block; width: 100%; }
  .parts tr.row { border: 1px solid var(--line); margin-bottom: .75rem; padding: .5rem .25rem; }
  .parts td { border: 0; padding: .3rem .6rem; }
  .parts .ct, .parts .st { white-space: normal; }
}
.count { font-family: var(--mono); color: var(--dim); font-size: 1rem; margin-left: auto; }

/* Datasheet page */
.ds-head { display: grid; gap: 1rem; grid-template-columns: 1fr; border-bottom: 1px solid var(--line-2); padding-bottom: 1.5rem; }
@media (min-width: 70rem) { .ds-head { grid-template-columns: minmax(0, 1fr) 22rem; align-items: end; } }
.ds-pn { font-family: var(--mono); color: var(--amber); font-size: 1rem; margin: 0 0 .5rem; }
.spec { width: 100%; border-collapse: collapse; font-size: 1rem; }
.spec th { text-align: left; font-family: var(--mono); font-weight: 500; color: var(--dim); padding: .45rem .75rem .45rem 0; border-bottom: 1px solid var(--line); vertical-align: top; width: 7.5rem; }
.spec td { padding: .45rem 0; border-bottom: 1px solid var(--line); }
.stack { display: flex; flex-wrap: wrap; gap: .35rem; list-style: none; margin: 0; padding: 0; }
.stack li { font-family: var(--mono); border: 1px solid var(--line-2); padding: 0 .45rem; font-size: 1rem; }
.ds-grid { display: grid; gap: 2rem; grid-template-columns: 1fr; margin-top: 1.5rem; }
@media (min-width: 80rem) { .ds-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); } }
.ds-grid > * { min-width: 0; }
.shot { border: 1px solid var(--line-2); margin: 0; }
.shot figcaption { font-family: var(--mono); font-size: 1rem; color: var(--dim); padding: .5rem .75rem; border-top: 1px solid var(--line-2); }
.clause { margin-bottom: 1.5rem; }
.clause h3 { font-family: var(--mono); font-size: 1.0625rem; font-weight: 600; margin-bottom: .4rem; }
.clause h3 span { color: var(--amber); margin-right: .6rem; }
.clause p { margin: 0 0 .7rem; max-width: 44rem; }
.clause ul { margin: 0 0 .7rem; padding-left: 1.2rem; max-width: 44rem; }
.clause li { margin-bottom: .3rem; }
.clause li::marker { color: var(--amber); content: "- "; }
.fig-scroll { overflow-x: auto; border: 1px solid var(--line-2); background: var(--panel); padding: 1rem; }
.fig-scroll svg { min-width: 42rem; width: 100%; height: auto; display: block; }
.story-figure { margin: 0; }
.fig-lead { color: var(--dim); margin: .25rem 0 1rem; max-width: 46rem; }
.warn { border: 1px solid var(--amber); background: var(--amber-dim); padding: .8rem 1rem; margin-top: 1.5rem; }
.warn b { font-family: var(--mono); color: var(--amber); display: block; font-weight: 600; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 2.5rem; }
.pager a { background: var(--bg); padding: 1rem; transition: background .2s var(--ease); }
.pager a:hover { background: var(--panel); }
.pager a:last-child { text-align: right; }
.pager span { display: block; font-family: var(--mono); color: var(--dim); font-size: 1rem; }
.pager b { font-weight: 600; }
.btn { display: inline-flex; align-items: center; gap: .5rem; font-family: var(--mono); font-size: 1rem; border: 1px solid var(--amber); color: var(--amber); padding: .55rem .9rem; background: transparent; cursor: pointer; transition: background .2s var(--ease), color .2s var(--ease); }
.btn:hover { background: var(--amber); color: #000; }

/* Figure diagrams drawn by figures.mjs */
.figure-svg text { font-family: var(--mono); fill: var(--text); }
.fig-label, .fig-node-title, .fig-hub-label, .fig-wheel-note { font-size: 26px; font-weight: 600; }
.fig-node-sub, .fig-axis, .fig-note, .fig-value, .fig-tag, .fig-lane { font-size: 24px; }
.fig-node-sub, .fig-axis, .fig-note { fill: var(--dim); }
.fig-lane { fill: var(--amber); transform: translateY(-12px); }
.fig-node rect, .fig-layer rect { fill: var(--bg); stroke: var(--line-2); stroke-width: 2; }
.fig-node.is-hi rect, .fig-layer.is-hi rect { stroke: var(--amber); fill: var(--amber-dim); }
.fig-edge, .fig-spoke { stroke: var(--dim); stroke-width: 2; fill: none; }
.fig-arrowhead { fill: var(--dim); }
.fig-grid { stroke: var(--line); }
.fig-bar rect, .fig-tally-bar, .fig-dot { fill: #6b6b68; }
.fig-bar.is-hi rect, .fig-tally-bar.is-hi, .fig-dot.is-after, .fig-hubdot.is-hi, .fig-cell.is-hi { fill: var(--amber); }
.fig-marker { stroke: var(--amber); stroke-dasharray: 6 6; stroke-width: 2; }
.fig-tally-track { fill: var(--panel-2); }
.fig-track { stroke: var(--line-2); stroke-width: 6; }
.fig-span { stroke: var(--amber); stroke-width: 6; }
.fig-ring, .fig-disk { fill: none; stroke: var(--line-2); stroke-width: 2; }
.fig-hubdot { fill: var(--text); }
.fig-hub { fill: var(--panel-2); stroke: var(--amber); stroke-width: 2; }
.fig-orbit-node, .fig-triad-node { fill: var(--bg); stroke: var(--line-2); stroke-width: 3; }
.fig-night { fill: #050505; }
.fig-star { fill: #f5f5f0; }
.fig-sky-arc { fill: none; stroke: #444; stroke-dasharray: 4 8; }
.fig-treeline { fill: #000; }
.fig-geodesic { fill: none; stroke: var(--text); stroke-width: 2; }
.fig-geodesic.is-fine { stroke: var(--line-2); }
.fig-cell { fill: #6b6b68; }
.fig-cellmark rect { fill: var(--panel-2); stroke: var(--line-2); }
.fig-cellmark circle { fill: none; stroke-width: 3; }
.fig-trail { fill: none; stroke-width: 2.5; }
.fig-origin { fill: var(--amber); }
.fig-wedge { stroke: var(--bg); stroke-width: 3; }
.fig-tag { fill: var(--amber); }

/* Profile and contact form */
.kv { display: grid; grid-template-columns: 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); }
@media (min-width: 48rem) { .kv { grid-template-columns: 1fr 1fr; } }
.kv div { background: var(--panel); padding: 1rem; }
.kv h3 { font-family: var(--mono); font-size: 1rem; color: var(--amber); font-weight: 500; margin-bottom: .35rem; }
.kv p { margin: 0; }
.prose p { max-width: 46rem; margin: 0 0 .9rem; }
.prose ul { max-width: 46rem; padding-left: 1.2rem; }
.form { display: grid; gap: 1rem; max-width: 40rem; margin-top: 1.5rem; }
.form label { display: grid; gap: .35rem; font-family: var(--mono); font-size: 1rem; color: var(--dim); }
.form input, .form textarea { background: var(--panel); border: 1px solid var(--line-2); padding: .65rem .75rem; font-size: 1.0625rem; transition: border-color .2s var(--ease), background .2s var(--ease); }
.form input:focus, .form textarea:focus { outline: none; border-color: var(--amber); background: var(--panel-2); }
.form textarea { min-height: 10rem; resize: vertical; }
.form .btn { justify-self: start; }
.note { font-family: var(--mono); font-size: 1rem; color: var(--dim); }

/* Scroll reveal and page transitions */
.rv { opacity: 0; transform: translateY(12px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.rv.in { opacity: 1; transform: none; }
::view-transition-old(root) { animation: .2s var(--ease) both d2-out; }
::view-transition-new(root) { animation: .35s var(--ease) both d2-in; }
@keyframes d2-out { to { opacity: 0; } }
@keyframes d2-in { from { opacity: 0; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after, ::view-transition-old(root), ::view-transition-new(root) { animation: none !important; transition: none !important; }
  .rv { opacity: 1; transform: none; }
}