:root {
  --page-bg: #fafbfc;
  --page-bg-deep: #f3f5f8;
  --surface: #ffffff;
  --card: #ffffff;
  --card-ink: #0e1622;
  --panel: #f3f5f8;
  --panel-edge: rgba(14, 22, 34, 0.08);
  --panel-edge-strong: rgba(14, 22, 34, 0.16);
  --text: #1a2537;
  --muted: #5b6878;
  --v1: #d01010; --v2: #e05810; --v3: #c9a800; --v4: #009020;
  --v5: #0088a0; --v6: #2020b0; --v7: #a010a0; --v8: #a84848;
  --accent: #2eb9ff;
  --accent-strong: #1a91d6;
  --accent-soft: rgba(46, 185, 255, 0.1);
  --brand-red: #ff3b30;
  --brand-red-hover: #ff5c52;
  --brand-topline: #2eb9ff;
  --sidebar-bg: var(--page-bg);
  --sidebar-ink: var(--card-ink);
  --sidebar-muted: var(--muted);
  --sidebar-line: var(--panel-edge);
  --sidebar-hover-bg: rgba(14, 22, 34, 0.04);
  --sidebar-hover-edge: rgba(14, 22, 34, 0.1);
  --sidebar-hover-bar: rgba(14, 22, 34, 0.28);
  --sidebar-active-bg: rgba(46, 185, 255, 0.12);
  --sidebar-active-edge: rgba(46, 185, 255, 0.35);
  --sidebar-active-bar: #2eb9ff;
  --sidebar-sec-start: rgba(46, 185, 255, 0.08);
  --sidebar-sec-compose: rgba(232, 120, 48, 0.09);
  --sidebar-sec-operate: rgba(48, 150, 110, 0.09);
  --radius: 0;
  --radius-sm: 0;
  --shadow: 0 1px 2px rgba(14, 22, 34, 0.05);
  --shadow-lg: 0 10px 30px rgba(14, 22, 34, 0.08);
  --sidebar-w: 15.5rem;
  --hb-layout-max: 1440px;
  --led-chassis: #0a0d14;

  --font-logo: "Bebas Neue", "Arial Narrow", Arial, sans-serif;
  --font-display: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-tech: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  color-scheme: light;
}
* { box-sizing: border-box; }
html { font-size: 114%; scroll-behavior: smooth; scroll-padding-top: 0.75rem; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--page-bg);
  -webkit-font-smoothing: antialiased;
}
.wrap {
  width: 100%;
  margin: 0;
  padding: clamp(1.25rem, 3vw, 2.5rem) clamp(1rem, 4vw, 2.75rem) clamp(2rem, 5vw, 3.5rem);
}
.wrap > p.lead:first-of-type {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
  max-width: 38rem;
}
.wrap > header {
  text-align: left;
  padding-bottom: 1.25rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--panel-edge);
}
.wrap > header h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.8vw, 1.85rem);
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--card-ink);
}
.wrap > header .tag {
  margin: 0.4rem 0 0;
  max-width: 34rem;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 400;
  line-height: 1.45;
}
.lead {
  font-size: 1.08rem;
  color: var(--card-ink);
  text-align: left;
  max-width: 42rem;
  margin: 0 0 1rem;
}
nav.toc {
  display: grid;
  gap: 0.35rem 1.25rem;
  grid-template-columns: repeat(auto-fill, minmax(11rem, 1fr));
  padding: 1.1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius);
  box-shadow: none;
  margin-bottom: 2.75rem;
}
nav.toc strong {
  grid-column: 1 / -1;
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}
nav.toc a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0.2rem 0;
}
nav.toc a:hover { color: #000; text-decoration: underline; text-underline-offset: 3px; }
h2 {
  font-family: var(--font-logo);
  font-weight: 400;
  font-size: 1.9rem;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  margin: 0 0 0.5rem;
  color: #000;
  -webkit-text-stroke: 0.25px #000;
  paint-order: stroke fill;
  line-height: 1.05;
}
h2 span:not(.hb-brand):not(.hb-mention) { color: var(--accent); font-weight: 400; }
h2 .hb-mention,
h2 .hb-mention .hb-ico { color: inherit; }
h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.35rem 0 0.4rem;
  color: #2a2835;
}
p { margin: 0.5rem 0; color: #2f2d38; }
ul { margin: 0.45rem 0 0.8rem 1rem; padding: 0; color: #3a3845; }
li { margin: 0.25rem 0; }
.note {
  margin: 1rem 0;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(255, 200, 180, 0.5), rgba(200, 240, 255, 0.35));
  border: 1px solid var(--panel-edge);
  font-size: 0.95rem;
  color: var(--card-ink);
}
.split {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2.25rem);
  align-items: start;
  margin: 2.5rem 0;
}
@media (max-width: 720px) {
  .split { grid-template-columns: 1fr; }
  .split .viz-panel { order: -1; }
}
.split__text { min-width: 0; }
.viz-panel {
  position: sticky;
  top: 1rem;
  padding: 1rem 1rem 1.15rem;
  background: var(--surface);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius);
  box-shadow: none;
  text-align: center;
}
.viz-caption {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0 0 0.75rem;
  line-height: 1.45;
}
.viz-caption--below {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0.35rem auto 0.85rem;
  line-height: 1.45;
  max-width: 38rem;
  text-align: center;
}
.hb-led-row > div > .viz-caption--below {
  max-width: 13.5rem;
}
canvas.led-matrix {
  width: 100%;
  max-width: 280px;
  height: auto;
  aspect-ratio: 1;
  margin: 0 auto;
  display: block;
  border-radius: 0;
  image-rendering: auto;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
}
.enc-grid {
  display: grid;
  gap: 0.65rem;
  margin-top: 1rem;
}
.enc {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.65rem 0.75rem;
  background: var(--panel);
  border-radius: var(--radius-sm);
  border: 1px solid var(--panel-edge);
}
.enc__n {
  flex: 0 0 2rem;
  height: 2rem;
  border-radius: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.82rem;
  color: #0a080c;
}
.enc--1 .enc__n { background: var(--v1); }
.enc--2 .enc__n { background: var(--v2); color: #1a0a06; }
.enc--3 .enc__n { background: var(--v3); color: #1a1a06; }
.enc--4 .enc__n { background: var(--v5); color: #060e12; }
.enc__body { font-size: 0.9rem; color: #3a3845; line-height: 1.5; }
.enc__body strong { color: var(--card-ink); font-weight: 600; }
.lede { font-size: 1.02rem; color: var(--card-ink); margin-bottom: 0.75rem; }
.section-block { margin-bottom: 3rem; }
.handbook-page {
  margin-bottom: 3.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}
.handbook-page:last-of-type {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}
.handbook-page > .handbook-page__title {
  font-family: var(--font-logo);
  font-size: 2.7rem;
  font-weight: 400;
  margin: 0 0 0.45rem;
  color: #000;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  line-height: 1;
  -webkit-text-stroke: 0.3px #000;
  paint-order: stroke fill;
}
.handbook-page__summary {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0 0 1.5rem;
  max-width: 40rem;
}
.hb-sub {
  margin: 0;
  padding: 0;
}
.hb-sub + hr,
.hb-welcome-top + hr {
  border: none;
  border-top: 1px solid var(--panel-edge-strong);
  margin: 3rem 0 4.25rem;
  height: 0;
}
.hb-sub > h2,
.hb-sub > h3.hb-sub__title {
  font-family: var(--font-logo);
  font-size: 1.67rem;
  font-weight: 400;
  margin: 0 0 0.5rem;
  color: #000;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  line-height: 1.05;
  -webkit-text-stroke: 0.25px #000;
  paint-order: stroke fill;
}
.hb-sub .section-block { margin-bottom: 0; }
nav.toc-nested {
  display: block;
  padding: 1rem 1.15rem 1.1rem;
  background: var(--surface);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius);
  box-shadow: none;
  margin-bottom: 2.5rem;
  font-size: 0.9rem;
}
nav.toc-nested > strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--muted);
  margin-bottom: 0.65rem;
}
nav.toc-nested ul {
  list-style: none;
  margin: 0;
  padding: 0 0 0 0.5rem;
}
nav.toc-nested > ul { padding-left: 0; }
nav.toc-nested li { margin: 0.2rem 0; }
nav.toc-nested ul ul {
  margin: 0.15rem 0 0.35rem 0.5rem;
  padding-left: 0.75rem;
  border-left: 2px solid rgba(37, 99, 235, 0.2);
}
nav.toc-nested a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}
nav.toc-nested a:hover { text-decoration: underline; text-underline-offset: 2px; color: var(--card-ink); }
nav.toc-nested .toc-page {
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  display: block;
  margin-top: 0.5rem;
  margin-bottom: 0.15rem;
}
nav.toc-nested .toc-page:first-child { margin-top: 0; }
.hb-device {
  margin: 2rem 0;
  padding: 1.35rem 1.25rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius);
  box-shadow: none;
}
.hb-device__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
  color: var(--card-ink);
}
.hb-device > .hb-led-wrap + .hb-device__title {
  margin-top: 1rem;
}
.hb-device__intro {
  font-size: 0.95rem;
  color: #3a3845;
  margin: 0 0 1rem;
  max-width: 52rem;
}
.hb-device > .opt-table {
  width: 100%;
  max-width: none;
  margin: 1rem 0 0;
}
.hb-device > .hb-led-row {
  margin-top: 0;
  margin-bottom: 0;
}
.hb-device > .hb-led-row + .hb-device__intro,
.hb-device > .hb-led-row + .opt-table,
.hb-device > .hb-led-row + p {
  margin-top: 1rem;
}
.hb-subsection-heading {
  font-family: var(--font-logo);
  font-size: 1.55rem;
  font-weight: 400;
  margin: 2rem 0 0.5rem;
  color: #000;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  line-height: 1.05;
  -webkit-text-stroke: 0.25px #000;
  paint-order: stroke fill;
}
/* Square LED matrix preview chassis (.hb-display-image = hook for "display image") */
.hb-led-wrap {
  box-sizing: border-box;
  width: min(15.75rem, 88vw);
  aspect-ratio: 1;
  max-width: none;
  margin: 0 auto 0.5rem;
  padding: clamp(0.45rem, 2.5vw, 0.75rem);
  background: var(--led-chassis);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 0;
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.04),
    inset 0 0 60px rgba(0, 0, 0, 0.7),
    0 6px 20px rgba(14, 22, 34, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
}
.hb-led-wrap canvas.led-matrix {
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1;
  margin: 0;
  border-radius: 0;
}
.hb-led-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 1rem;
}
.hb-led-row .hb-led-wrap {
  width: min(11rem, 42vw);
  aspect-ratio: 1;
  margin: 0;
  flex: 0 1 auto;
}
.hb-led-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #8a8698;
  text-align: center;
  margin: 0 0 0.35rem;
}
.hb-enc-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.65rem;
  margin-top: 0.25rem;
  align-items: stretch;
}
.hb-enc-card {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.5rem 0.65rem;
  min-width: 0;
  width: 100%;
}
.hb-enc-card--empty {
  opacity: 0.45;
}
.hb-enc-card--empty .enc-act {
  min-height: 1.5rem;
}
.hb-enc-card h5 {
  margin: 0 0 0.45rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--card-ink);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.hb-enc-card h5 .kn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.35rem;
  height: 1.35rem;
  border-radius: 0;
  font-size: 0.72rem;
  color: #0a080c;
}
.hb-enc--1 .kn { background: var(--v1); color: #fff; }
.hb-enc--2 .kn { background: var(--v2); }
.hb-enc--3 .kn { background: var(--v3); color: #1a1a06; }
.hb-enc--4 .kn { background: var(--v5); color: #060e12; }
table.enc-act {
  width: 100%;
  max-width: none;
  border-collapse: collapse;
  font-size: 0.78rem;
  line-height: 1.45;
}
table.enc-act th,
table.enc-act td {
  border: 1px solid var(--panel-edge);
  padding: 0.32rem 0.4rem;
  text-align: left;
  vertical-align: top;
}
table.enc-act th {
  background: var(--panel);
  font-weight: 600;
  color: var(--card-ink);
  width: 28%;
}
table.opt-table {
  width: 100%;
  max-width: none;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 0.75rem 0 1rem;
}
table.opt-table th,
table.opt-table td {
  border: 1px solid var(--panel-edge);
  padding: 0.45rem 0.55rem;
  text-align: left;
  vertical-align: top;
}
table.opt-table th {
  background: var(--panel);
  font-weight: 600;
  width: auto;
  min-width: 5rem;
  color: var(--card-ink);
}
table.opt-table th:first-child {
  min-width: 6.5rem;
}
.subsection-title {
  font-family: var(--font-display);
  font-size: 1.02rem;
  margin: 1.75rem 0 0.5rem;
  color: #252330;
}
.menu-tree-wrap {
  margin-top: 1.5rem;
  padding: 1.4rem 1.4rem 1.6rem;
  background: var(--card);
  border: 1px solid var(--panel-edge);
  border-radius: 0;
  box-shadow: none;
}
.menu-tree-wrap .tree-intro { font-size: 0.92rem; color: var(--muted); margin: 0 0 1rem 0.1rem; }
.tree-legend {
  display: grid;
  gap: 0.55rem;
  margin: 0 0 1.25rem;
  padding: 0.85rem 1rem;
  background: #f7f8fb;
  border: 1px solid var(--panel-edge);
}
.tree-legend__title {
  font-family: var(--font-tech);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #5a6170;
  margin: 0 0 0.15rem;
}
.tree-legend__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem 0.85rem;
  font-size: 0.86rem;
  color: #3a4050;
  line-height: 1.4;
}
.tree-legend__row .node { margin-right: 0; }
.tree-legend__swatch {
  display: inline-block;
  width: 1.1rem;
  height: 1.1rem;
  border: 1px solid rgba(0, 0, 0, 0.12);
  vertical-align: -2px;
  margin-right: 0.35rem;
}
.tree-legend__swatch--blue { background: rgba(46, 185, 255, 0.22); }
.tree-legend__swatch--red { background: rgba(255, 59, 48, 0.18); }
ul.menu-tree, ul.menu-tree ul { list-style: none; margin: 0; padding: 0; }
ul.menu-tree { display: grid; gap: 0.4rem; }
ul.menu-tree > li {
  background: #fff;
  border: 1px solid var(--panel-edge);
  border-radius: 0;
  padding: 0.9rem 1rem 0.9rem 1.1rem;
  transition: background 0.12s ease, border-color 0.12s ease;
}
ul.menu-tree > li:hover {
  background: rgba(15, 23, 42, 0.03);
  border-color: #c5cad6;
}
ul.menu-tree ul {
  margin: 0.65rem 0 0;
  padding: 0.4rem 0 0 0.5rem;
  border-left: 2px solid rgba(46, 185, 255, 0.25);
  display: grid;
  gap: 0.35rem;
}
ul.menu-tree ul li {
  padding: 0.4rem 0.5rem 0.45rem 0.6rem;
  border-radius: 0;
  background: rgba(46, 185, 255, 0.04);
}
ul.menu-tree ul li:hover {
  background: rgba(46, 185, 255, 0.09);
}
ul.menu-tree ul ul li:hover {
  background: rgba(255, 59, 48, 0.08);
}
ul.menu-tree ul ul {
  margin-top: 0.45rem;
  border-left-color: rgba(255, 59, 48, 0.22);
}
ul.menu-tree ul ul li { background: rgba(255, 59, 48, 0.04); }
.menu-tree .node {
  display: inline-block;
  font-family: var(--font-tech);
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  padding: 0.18rem 0.5rem;
  border-radius: 0;
  background: #1f2937;
  color: #f8fafc;
  text-transform: uppercase;
  margin-right: 0.55rem;
  vertical-align: 1px;
}
ul.menu-tree > li > .node {
  background: #c9241b;
  font-size: 0.86rem;
  padding: 0.22rem 0.62rem;
  letter-spacing: 0.1em;
}
ul.menu-tree ul ul > li > .node {
  background: #1d4ed8;
}
ul.menu-tree > li:hover > .node {
  background: #a81f17;
}
ul.menu-tree ul li:hover > .node {
  background: #374151;
}
ul.menu-tree ul ul li:hover > .node {
  background: #2563eb;
}
.menu-tree a:hover .node {
  background: #374151;
}
ul.menu-tree > li > ul > li > a:hover .node {
  background: #374151;
}
ul.menu-tree ul ul a:hover .node {
  background: #2563eb;
}
.menu-tree .desc { color: #2a2937; font-size: 0.95rem; line-height: 1.45; }
.menu-tree .sub {
  display: block;
  margin: 0.5rem 0 0;
  padding: 0.55rem 0.75rem;
  border-left: 3px solid rgba(46, 185, 255, 0.35);
  background: rgba(46, 185, 255, 0.06);
  border-radius: 0;
  font-size: 0.86rem;
  color: #475064;
  font-style: normal;
  line-height: 1.5;
}
ul.menu-tree ul ul .sub { border-left-color: rgba(255, 59, 48, 0.35); background: rgba(255, 59, 48, 0.05); }
.menu-tree .sub-opts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}
.menu-tree .sub-opts li {
  margin: 0;
  padding: 0.2rem 0 0.2rem 0.85rem;
  background: transparent !important;
  border: 0;
  position: relative;
  line-height: 1.4;
}
.menu-tree .sub-opts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 0.35rem;
  height: 0.35rem;
  background: currentColor;
  opacity: 0.35;
}
.menu-tree .sub-opts + .how { margin-top: 0.55rem; }
.menu-tree .how {
  display: block;
  margin: 0.35rem 0 0;
  font-size: 0.82rem;
  color: #6a7285;
  line-height: 1.45;
}
.swatch-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0.75rem 0 1rem;
}
.swatch {
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.35);
}
.plan-box {
  margin-bottom: 2.5rem;
  padding: 1.1rem 1.25rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius);
  box-shadow: none;
}
.plan-box ol {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
  color: #3a3845;
  font-size: 0.95rem;
}
.plan-box li { margin: 0.35rem 0; }
.plan-box a { color: var(--accent); }
.screen-catalog h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 2rem 0 0.75rem;
  color: #252330;
  border-bottom: 1px solid var(--panel-edge);
  padding-bottom: 0.35rem;
}
.screen-catalog h4 {
  font-size: 0.95rem;
  margin: 1.5rem 0 0.35rem;
  color: var(--card-ink);
}

/* ---- App shell: sidebar + main (see _apply_shell.py) ---- */
.hb-skip {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.hb-skip:focus {
  position: fixed;
  left: 0.75rem;
  top: 0.75rem;
  width: auto;
  height: auto;
  padding: 0.55rem 1rem;
  z-index: 9999;
  background: #fff;
  color: var(--card-ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.hb-app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
  align-items: stretch;
  width: 100%;
  max-width: var(--hb-layout-max);
  margin: 0;
}

.hb-sidebar {
  background: var(--sidebar-bg);
  color: var(--sidebar-ink);
  color-scheme: light;
  padding: 0;
  align-self: stretch;
  height: auto;
  overflow: visible;
  overflow-anchor: none;
  border-right: 1px solid var(--sidebar-line);
}
.hb-vh {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.hb-sidebar__search {
  margin: 0;
  padding: 0.85rem 1.25rem 1rem;
  border-bottom: 1px solid var(--sidebar-line);
}
.hb-sidebar__search-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.35rem;
  align-items: stretch;
}
.hb-sidebar__search-input {
  width: 100%;
  min-width: 0;
  margin: 0;
  padding: 0.48rem 0.65rem;
  border: 1px solid var(--sidebar-line);
  border-radius: 0;
  background: var(--surface);
  color: var(--card-ink);
  font: inherit;
  font-size: 0.82rem;
  line-height: 1.3;
}
.hb-sidebar__search-input::placeholder { color: var(--muted); }
.hb-sidebar__search-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
.hb-sidebar__search-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.15rem;
  padding: 0;
  border: 1px solid var(--sidebar-line);
  background: var(--panel);
  color: var(--card-ink);
  cursor: pointer;
}
.hb-sidebar__search-btn:hover {
  background: var(--sidebar-hover-bg);
  color: var(--accent);
}
.hb-sidebar__search-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
.hb-sidebar__search-btn .hb-ico {
  width: 1rem;
  height: 1rem;
  display: block;
}
.hb-sidebar__brand {
  display: none;
  flex-direction: column;
  gap: 0.15rem;
  margin: 0;
  padding: 1.35rem 1.25rem 1rem;
  text-align: left;
}
@media (min-width: 901px) {
  .hb-sidebar__brand {
    display: flex;
  }
}
.hb-sidebar__brand h1 {
  margin: 0;
  font: inherit;
  letter-spacing: normal;
  text-transform: none;
  color: inherit;
  border: 0;
  padding: 0;
}
.hb-sidebar__logo {
  font-family: var(--font-logo);
  font-weight: 400;
  font-size: 3.83rem;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: #000;
  text-decoration: none;
  line-height: 1;
  -webkit-text-stroke: 0.35px #000;
  paint-order: stroke fill;
}
.hb-sidebar__logo:hover { color: #000; }
.hb-sidebar__kicker {
  margin: 0;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sidebar-muted);
}
.hb-sidebar__hint,
.hb-sidebar__brand .tag {
  margin: 0.35rem 0 0;
  max-width: none;
  font-size: 0.78rem;
  line-height: 1.45;
  font-weight: 400;
  color: #4a5568;
  text-transform: none;
  letter-spacing: normal;
}
.hb-sidebar__nav {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.hb-sidebar__section {
  padding: 0;
  transition: background 0.15s ease;
}
.hb-sidebar__section--start {
  background: var(--sidebar-sec-start);
}
.hb-sidebar__section--compose {
  background: var(--sidebar-sec-compose);
}
.hb-sidebar__section--operate {
  background: var(--sidebar-sec-operate);
}
.hb-sidebar__nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.hb-sidebar__link {
  display: grid;
  grid-template-columns: 1.15rem 1fr;
  gap: 0.55rem;
  align-items: start;
  padding: 0.42rem 1.25rem;
  border-radius: 0;
  text-decoration: none;
  color: inherit;
  border: none;
  transition: background 0.12s ease;
}
.hb-sidebar__link-ico {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.18rem;
  color: #5b6878;
}
.hb-sidebar__link-ico .hb-ico {
  width: 1.05rem;
  height: 1.05rem;
  display: block;
}
.hb-sidebar__link-text {
  min-width: 0;
  display: flex;
  flex-direction: column;
}
.hb-sidebar__link:hover .hb-sidebar__link-ico,
.hb-sidebar__link--active .hb-sidebar__link-ico {
  color: #0a4f73;
}
.hb-sidebar__link--alert .hb-sidebar__link-ico {
  color: #c62828;
}
.hb-sidebar__link:hover {
  background: var(--sidebar-hover-bg);
}
.hb-sidebar__link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.hb-sidebar__link--active {
  background: var(--sidebar-active-bg);
  border: none;
}
.hb-sidebar__section--compose .hb-sidebar__link--active {
  background: rgba(232, 120, 48, 0.22);
}
.hb-sidebar__section--compose .hb-sidebar__link--active .hb-sidebar__link-title,
.hb-sidebar__section--compose .hb-sidebar__link--active .hb-sidebar__link-ico {
  color: #8a3e10;
}
.hb-sidebar__section--compose .hb-sidebar__link--active .hb-sidebar__link-desc {
  color: #9a5a30;
}
.hb-sidebar__section--operate .hb-sidebar__link--active {
  background: rgba(48, 150, 110, 0.22);
}
.hb-sidebar__section--operate .hb-sidebar__link--active .hb-sidebar__link-title,
.hb-sidebar__section--operate .hb-sidebar__link--active .hb-sidebar__link-ico {
  color: #145238;
}
.hb-sidebar__section--operate .hb-sidebar__link--active .hb-sidebar__link-desc {
  color: #2a6a4a;
}
.hb-sidebar__link--alert .hb-sidebar__link-title {
  color: #c62828;
}
.hb-sidebar__link--alert .hb-sidebar__link-desc {
  color: #b04a45;
}
.hb-sidebar__link--alert:hover .hb-sidebar__link-ico,
.hb-sidebar__link--alert:hover .hb-sidebar__link-title,
.hb-sidebar__link--alert.hb-sidebar__link--active .hb-sidebar__link-ico,
.hb-sidebar__link--alert.hb-sidebar__link--active .hb-sidebar__link-title {
  color: #b71c1c;
}
.hb-sidebar__link--alert:hover .hb-sidebar__link-desc,
.hb-sidebar__link--alert.hb-sidebar__link--active .hb-sidebar__link-desc {
  color: #a03a35;
}
.hb-sidebar__section--operate .hb-sidebar__link--alert.hb-sidebar__link--active {
  background: transparent;
}
.hb-sidebar__section--operate .hb-sidebar__link--alert.hb-sidebar__link--active .hb-sidebar__link-title,
.hb-sidebar__section--operate .hb-sidebar__link--alert.hb-sidebar__link--active .hb-sidebar__link-ico {
  color: #b71c1c;
}
.hb-sidebar__section--operate .hb-sidebar__link--alert.hb-sidebar__link--active .hb-sidebar__link-desc {
  color: #a03a35;
}

/* Inline mention icons (encoder knob / touch hand) — never taller/wider than the text */
.hb-ico {
  display: inline-block;
  vertical-align: -0.15em;
  flex-shrink: 0;
}
.hb-ico--inline,
.hb-mention .hb-ico {
  width: 0.85em;
  height: 0.85em;
  width: min(0.85em, 1cap, 1lh);
  height: min(0.85em, 1cap, 1lh);
  max-width: 1em;
  max-height: 1lh;
  margin: 0 0.12em 0 0;
  padding: 0;
  vertical-align: -0.08em;
  overflow: hidden;
  line-height: 0;
  box-sizing: border-box;
  color: #3a5568;
}
.hb-mention {
  white-space: nowrap;
  display: inline;
  line-height: inherit;
  vertical-align: baseline;
}
.hb-mention--encoder .hb-ico--inline { color: #1a6a8a; }
.hb-mention--touch .hb-ico--inline { color: #6a3a78; }

.hb-sidebar__link-title {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  color: var(--card-ink);
}
.hb-sidebar__link-desc {
  display: block;
  font-size: 0.72rem;
  color: #4a5568;
  margin-top: 0.12rem;
  line-height: 1.35;
}
.hb-sidebar__link--active .hb-sidebar__link-title {
  color: #0a4f73;
}
.hb-sidebar__link--active .hb-sidebar__link-desc {
  color: #3a6478;
}

/* Mobile chrome — hidden on desktop */
.hb-mobile-bar,
.hb-nav-toggle,
.hb-nav-backdrop {
  display: none;
}
.hb-nav-toggle {
  align-items: center;
  justify-content: center;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 0;
}
.hb-mobile-bar__brand {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  text-decoration: none;
  color: inherit;
  min-width: 0;
}
.hb-mobile-bar__logo {
  font-family: var(--font-logo);
  font-weight: 400;
  font-size: 1.9rem;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: #000;
  line-height: 1;
  -webkit-text-stroke: 0.35px #000;
  paint-order: stroke fill;
}
.hb-mobile-bar__kicker {
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sidebar-muted);
  line-height: 1;
}
.hb-mobile-bar__brand:hover .hb-mobile-bar__logo { color: #000; }
.hb-nav-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.hb-nav-toggle__icon {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 20px;
  height: 16px;
}
.hb-nav-toggle__icon span {
  display: block;
  height: 2px;
  width: 100%;
  border-radius: 1px;
  background: var(--sidebar-ink);
  transition: transform 0.2s ease, opacity 0.15s ease;
}
body.hb-nav-open .hb-nav-toggle__icon span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
body.hb-nav-open .hb-nav-toggle__icon span:nth-child(2) {
  opacity: 0;
}
body.hb-nav-open .hb-nav-toggle__icon span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.hb-main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--page-bg);
}
.hb-main__scroll {
  flex: 1;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.hb-pager {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.35rem 1rem;
  margin-top: 2rem;
  padding: 0.65rem 0 0;
  border-top: 1px solid var(--panel-edge);
  background: transparent;
  border-radius: 0;
  box-shadow: none;
}
.hb-pager__spacer {
  display: block;
  min-height: 0;
}
.hb-pager__link {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.1rem;
  padding: 0.2rem 0;
  border-radius: 0;
  text-decoration: none;
  color: inherit;
  border: none;
  background: transparent;
  transition: color 0.15s ease, opacity 0.15s ease;
}
.hb-pager__link:hover .hb-pager__name {
  color: var(--accent);
}
.hb-pager__link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}
.hb-pager__link--hub {
  grid-column: 2;
  text-align: center;
  font-weight: 500;
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  justify-self: center;
  min-width: 0;
  padding: 0.25rem 0.35rem;
  color: var(--muted);
}
.hb-pager__link--hub:hover {
  color: var(--accent);
}
.hb-pager__link--prev { grid-column: 1; text-align: left; }
.hb-pager__link--next {
  grid-column: 3;
  text-align: right;
  align-items: flex-end;
}
.hb-pager__dir {
  font-family: var(--font-tech);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.hb-pager__name {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--card-ink);
}

.hb-home-grid {
  margin: 2.25rem 0 0.5rem;
}
.hb-home-grid__title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--card-ink);
}
.hb-home-grid__lede {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: 0.98rem;
  max-width: 36rem;
}
.hb-card-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(13.5rem, 1fr));
  gap: 0.85rem;
}
.hb-card {
  margin: 0;
}
.hb-card__link {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  height: 100%;
  padding: 1rem 1.1rem;
  background: var(--card);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius);
  box-shadow: none;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.hb-card__link:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  border-color: rgba(37, 99, 235, 0.2);
}
.hb-card__link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.hb-card__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--card-ink);
}
.hb-card__desc {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.45;
}

.hb-hero {
  text-align: center;
  padding: 2.5rem 1rem 2rem;
  margin: 0 0 1.5rem;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  box-shadow: none;
}
.hb-hero__eyebrow {
  margin: 0 0 0.35rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}
.hb-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 6vw, 3.2rem);
  letter-spacing: 0.02em;
  margin: 0;
  line-height: 1.05;
}
.hb-hero__title a {
  color: #000;
  text-decoration: none;
}
.hb-hero__title a:hover { color: #000; }
.hb-hero__tag {
  margin: 1rem auto 0;
  max-width: 34rem;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.55;
}

.wrap > header:not(.hb-hero) {
  text-align: left;
  padding-bottom: 0.75rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--panel-edge);
}
.wrap > header:not(.hb-hero) h1 {
  font-family: var(--font-logo);
  font-weight: 400;
  font-size: clamp(1.92rem, 4.8vw, 2.325rem);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1.05;
  margin: 0;
  color: var(--card-ink);
}
.wrap > header:not(.hb-hero) h1 a {
  color: inherit;
  text-decoration: none;
  font: inherit;
}
.wrap > header:not(.hb-hero) h1 a:hover { color: var(--accent); }
.wrap > header:not(.hb-hero) .tag {
  margin: 0.3rem 0 0;
  max-width: 32rem;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
  font-weight: 400;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 900px) {
  :root {
    --sidebar-w: 100%;
    --hb-mobile-bar-h: 3.15rem;
  }
  html { scroll-padding-top: calc(var(--hb-mobile-bar-h) + env(safe-area-inset-top, 0px) + 0.5rem); }
  .hb-pager__spacer { display: none; }
  .hb-app {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: calc(var(--hb-mobile-bar-h) + env(safe-area-inset-top, 0px));
  }
  /* Mobile: logo header + burger + slide-in drawer */
  .hb-mobile-bar {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 310;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    height: calc(var(--hb-mobile-bar-h) + env(safe-area-inset-top, 0px));
    padding: env(safe-area-inset-top, 0px) 0.55rem 0 0.95rem;
    background: var(--sidebar-bg);
    border-bottom: 1px solid var(--sidebar-line);
  }
  .hb-nav-toggle {
    display: flex;
    position: static;
    flex-shrink: 0;
    width: 2.85rem;
    height: 2.85rem;
    border-radius: 0;
    border: 1px solid var(--sidebar-line);
    background: var(--sidebar-bg);
  }
  .hb-nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 300;
    background: rgba(15, 23, 42, 0.42);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.22s ease, visibility 0.22s ease;
    pointer-events: none;
  }
  body.hb-nav-open .hb-nav-backdrop {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .hb-sidebar {
    position: fixed;
    left: 0;
    top: calc(var(--hb-mobile-bar-h) + env(safe-area-inset-top, 0px));
    bottom: 0;
    width: min(20rem, 88vw);
    height: auto;
    max-height: none;
    align-self: stretch;
    transform: translateX(-102%);
    transition: transform 0.26s cubic-bezier(0.22, 1, 0.36, 1);
    z-index: 305;
    overflow-y: auto;
    overscroll-behavior: contain;
    border-right: 1px solid var(--sidebar-line);
    border-bottom: none;
    box-shadow: 8px 0 32px rgba(0, 0, 0, 0.45);
    padding: 0;
  }
  body.hb-nav-open .hb-sidebar {
    transform: translateX(0);
  }

  .hb-sidebar__group {
    font-size: 0.68rem;
    margin: 0.85rem 0 0.35rem;
    letter-spacing: 0.16em;
  }
  .hb-sidebar__group:first-child {
    margin-top: 0.65rem;
  }
  .hb-sidebar__nav ul {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    padding: 0;
    margin: 0;
    overflow: visible;
    scroll-snap-type: none;
  }
  .hb-sidebar__nav ul::-webkit-scrollbar {
    display: block;
  }
  .hb-sidebar__link {
    padding: 0.5rem 1.25rem;
    white-space: normal;
    font-size: 0.88rem;
    border-radius: 0;
  }
  .hb-sidebar__link-desc {
    display: block;
    font-size: 0.72rem;
  }

  /* Page chrome — tighten padding. */
  .wrap { padding: 0.85rem 0.9rem 2rem; }
  .hb-hero { padding: 1rem 1rem 0.9rem; }
  .hb-hero--compact { padding: 0.7rem 0.95rem 0.6rem; }
  .hb-hero__title,
  .hb-hero__title a { font-size: clamp(2.1rem, 9vw, 2.8rem); }

  /* Device cards — reduce padding, allow content to flex. */
  .hb-device { padding: 0.85rem; max-width: 100%; }
  .hb-device > .opt-table { font-size: 0.85rem; }
  .hb-led-wrap {
    width: min(15.75rem, calc(100vw - 2.5rem));
    aspect-ratio: 1;
    max-width: 100%;
    padding: 0.65rem;
  }
  canvas.led-matrix { max-width: 240px; }
  .hb-led-row { gap: 0.65rem; }
  .hb-enc-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.5rem; }

  /* Tables: enable horizontal scroll for wide tables. */
  .opt-table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .opt-table thead, .opt-table tbody, .opt-table tr { width: max-content; min-width: 100%; }

  /* Menu tree — slim cards. */
  .menu-tree-wrap { padding: 0.9rem; margin-top: 1rem; }
  ul.menu-tree > li { padding: 0.7rem 0.75rem; }
  ul.menu-tree ul { padding-left: 0.4rem; }
  ul.menu-tree ul li { padding: 0.35rem 0.4rem; }
  .menu-tree .desc { font-size: 0.88rem; }
  .menu-tree .sub { font-size: 0.8rem; padding: 0.5rem 0.6rem; }

  /* Hardware port-map: keep the photo readable, drop the SVG schematic on tiny screens. */
  .hb-portmap { padding: 0.65rem; }
  .hb-portmap__svg { display: none; }
  .hb-portmap__legend {
    grid-template-columns: 1fr;
    font-size: 0.84rem;
  }

  .hb-pager {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 0.45rem;
    padding: 0.55rem 0 0;
  }
  .hb-pager__link--prev,
  .hb-pager__link--next,
  .hb-pager__link--hub {
    grid-column: 1;
    align-items: center !important;
    text-align: center !important;
  }
}

@media (max-width: 520px) {
  .hb-hero__eyebrow { font-size: 0.65rem; letter-spacing: 0.22em; }
  .hb-hero__title,
  .hb-hero__title a { font-size: clamp(1.8rem, 9vw, 2.3rem); }
  canvas.led-matrix { max-width: 210px; }
  .hb-led-row { flex-direction: column; align-items: stretch; }
  .hb-led-row .hb-led-wrap {
    margin: 0 auto;
    width: min(18rem, calc(100vw - 2.5rem));
    aspect-ratio: 1;
    max-width: 100%;
  }
  h2 { font-size: 1.78rem; }
  .handbook-page > .handbook-page__title { font-size: 2.3rem; }
  .hb-sub > p.lede { font-size: 0.95rem; }
  .menu-tree .node { font-size: 0.72rem; padding: 0.16rem 0.42rem; }
  ul.menu-tree > li > .node { font-size: 0.78rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hb-card__link,
  .hb-pager__link,
  .hb-sidebar__link {
    transition: none;
  }
  .hb-card__link:hover {
    transform: none;
  }
}

/* ---- Beginner-first rewrite additions ---- */
.hb-sidebar__group {
  margin: 0.35rem 0 0.25rem;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #3a6478;
  padding: 0.35rem 1.25rem 0;
}
.hb-sidebar__section--start .hb-sidebar__group { color: #0a4f73; }
.hb-sidebar__section--compose .hb-sidebar__group { color: #9a4a18; }
.hb-sidebar__section--operate .hb-sidebar__group { color: #1e6a48; }
.hb-sidebar__section .hb-sidebar__group:first-child { margin-top: 0.15rem; }

/* Three-column "What you see / What to do / What changes" */
.hb-triplet {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1rem 0 1.25rem;
}
.hb-triplet--quad {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
@media (max-width: 820px) {
  .hb-triplet { grid-template-columns: 1fr; }
  .hb-triplet--quad { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.hb-triplet__cell {
  background: var(--surface);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.85rem 0.85rem;
  min-width: 0;
}
.hb-triplet__cell h6 {
  margin: 0 0 0.35rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.hb-triplet__cell--see h6 { color: #0b7a5b; }
.hb-triplet__cell--do  h6 { color: #b75418; }
.hb-triplet__cell--get h6 { color: #6431a8; }
.hb-triplet__cell p { margin: 0; font-size: 0.88rem; color: #2f2d38; line-height: 1.5; }

/* Voice ladder (colour reference) */
.hb-voices {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 0.55rem;
  margin: 1rem 0 1.5rem;
}
.hb-voice {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.45rem 0.6rem;
  background: var(--surface);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
}
.hb-voice__dot {
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  box-shadow: 0 0 0 2px rgba(0,0,0,0.25);
  flex-shrink: 0;
}
.hb-voice__num {
  font-weight: 700;
  color: var(--card-ink);
  font-variant-numeric: tabular-nums;
  min-width: 1.5rem;
}
.hb-voice__desc { color: var(--muted); font-size: 0.78rem; line-height: 1.35; }

/* Full-width handbook figures (e.g. annotated hardware photo) */
.hb-figure {
  margin: 0.85rem 0 1.5rem;
  padding: 0;
}
.hb-figure--full {
  width: 100%;
  max-width: none;
}
.hb-figure img {
  display: block;
  width: 100%;
  height: auto;
  background: #ececef;
}

/* Hardware port map (SVG outline) */
.hb-portmap {
  width: 100%;
  max-width: 46rem;
  display: block;
  margin: 1rem auto 1.5rem;
  background: var(--surface);
  border: 1px solid var(--panel-edge);
  border-radius: 0;
  padding: 1rem;
}
.hb-portmap svg { width: 100%; height: auto; display: block; }
.hb-portmap__photo {
  margin: 0 0 1rem;
  text-align: center;
}
.hb-portmap__photo img {
  max-width: 100%;
  height: auto;
  border-radius: 0;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.12);
  background: #f4f4f6;
}
.hb-portmap__photo figcaption {
  margin-top: 0.55rem;
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
}
.hb-portmap__svg { margin-top: 0.5rem; opacity: 0.97; }
.hb-portmap__legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 0.45rem 0.75rem;
  margin-top: 0.85rem;
  font-size: 0.82rem;
}
.hb-portmap__legend dt {
  font-weight: 700;
  color: var(--accent);
  display: inline-block;
  min-width: 1.4rem;
}
.hb-portmap__legend dd {
  margin: 0 0 0.25rem;
  color: #2f2d38;
}

/* Hardware page: photo + schematic side by side on wide viewports (SVG is hidden ≤900px). */
@media (min-width: 901px) {
  .hb-portmap {
    display: grid;
    grid-template-columns: minmax(0, 3fr) minmax(0, 7fr);
    gap: 1rem 1.25rem;
    align-items: start;
    max-width: 58rem;
  }
  .hb-portmap__legend {
    grid-column: 1 / -1;
    margin-top: 0.35rem;
  }
  .hb-portmap__photo {
    margin: 0;
  }
  .hb-portmap__svg {
    margin-top: 0;
  }
}

/* Step-by-step "first beat" walkthrough */
.hb-steps {
  display: grid;
  gap: 0.85rem;
  margin: 1rem 0 1.5rem;
  counter-reset: hbstep;
}
.hb-step {
  display: grid;
  grid-template-columns: 2.85rem 1fr;
  gap: 0.85rem;
  align-items: start;
  padding: 0.35rem 0;
  background: transparent;
  border: none;
  border-radius: 0;
}
.hb-step::before {
  counter-increment: hbstep;
  content: counter(hbstep);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.6rem;
  height: 2.6rem;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  font-weight: 700;
  font-size: 1.1rem;
}
.hb-step--v1::before { background: #ff0000; color: #fff; }
.hb-step--v2::before { background: #ff4500; color: #fff; }
.hb-step--v3::before { background: #ffff00; color: #1a1a06; }
.hb-step--v4::before { background: #00c800; color: #0a1a0a; }
.hb-step--v5::before { background: #00ffff; color: #062028; }
.hb-step--v6::before { background: #0000ff; color: #fff; }
.hb-step--v7::before { background: #ff00ff; color: #fff; }
.hb-step h4 { margin: 0 0 0.25rem; font-size: 1rem; color: var(--card-ink); }
.hb-step p { margin: 0; font-size: 0.9rem; color: #2f2d38; }
.hb-step__hint { margin-top: 0.4rem; font-size: 0.8rem; color: var(--muted); font-style: italic; }

/* FAQ for troubleshooting */
.hb-faq { margin: 1rem 0; }
.hb-faq details {
  background: var(--surface);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius-sm);
  margin: 0.5rem 0;
  padding: 0.65rem 0.85rem;
}
.hb-faq details[open] {
  border-color: rgba(37,99,235,0.3);
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
.hb-faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--card-ink);
  list-style: none;
}
.hb-faq summary::before {
  content: "▸ ";
  color: var(--accent);
  display: inline-block;
  transition: transform 0.15s;
  margin-right: 0.25rem;
}
.hb-faq details[open] summary::before { content: "▾ "; }
.hb-faq details p { margin: 0.5rem 0 0.25rem; font-size: 0.9rem; }

/* Reference grid (was menu-led-atlas) */
.hb-ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(11rem, 1fr));
  gap: 0.85rem;
  margin: 1rem 0;
}
.hb-ref-card {
  background: var(--surface);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.6rem 0.75rem;
  text-align: center;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, transform 0.12s;
}
.hb-ref-card:hover {
  border-color: rgba(37,99,235,0.3);
  transform: translateY(-1px);
}
.hb-ref-card canvas {
  width: 100%;
  max-width: 144px;
  height: auto;
  aspect-ratio: 1;
  display: block;
  margin: 0 auto 0.4rem;
  background: var(--led-chassis);
  border-radius: 0;
  padding: 0.35rem;
}
.hb-ref-card__name {
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--card-ink);
}
.hb-ref-card__desc {
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0.15rem;
  line-height: 1.35;
}

/* ADSR envelope diagram */
.hb-adsr {
  width: 100%;
  max-width: 30rem;
  background: var(--surface);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  margin: 1rem 0;
}
.hb-adsr svg { width: 100%; height: auto; display: block; }

/* Synth chain diagram */
.hb-chain {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
  margin: 1rem 0 1.25rem;
  padding: 0.75rem 0.85rem;
  background: var(--surface);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}
.hb-chain__node {
  padding: 0.35rem 0.65rem;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 0;
  font-weight: 600;
  color: var(--card-ink);
}
.hb-chain__arrow { color: var(--muted); font-weight: 700; }

/* Callout for warnings */
.hb-warn {
  background: linear-gradient(135deg, rgba(255,170,140,0.35), rgba(255,220,170,0.25));
  border: 1px solid rgba(200,100,30,0.3);
  border-left: 3px solid #b75418;
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.9rem;
  margin: 1rem 0;
  font-size: 0.92rem;
  color: var(--card-ink);
}
.hb-warn strong { color: #8a3a0a; }

/* Tip callout (subtler) */
.hb-tip {
  background: linear-gradient(135deg, rgba(180,230,200,0.35), rgba(190,220,255,0.25));
  border: 1px solid rgba(40,140,90,0.3);
  border-left: 3px solid #0b7a5b;
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.9rem;
  margin: 1rem 0;
  font-size: 0.92rem;
  color: var(--card-ink);
}
.hb-tip strong { color: #0b7a5b; }

/* Welcome: sticky top-right; body copy wraps around it */
.hb-welcome-top {
  display: block;
  margin: 0;
}
.hb-welcome-top::after {
  content: "";
  display: table;
  clear: both;
}
.hb-welcome-top > .hb-sticky {
  float: right;
  width: min(17.5rem, 46%);
  max-width: 17.5rem;
  margin: 0.15rem 0 1.1rem 1.5rem;
}
@media (max-width: 820px) {
  .hb-welcome-top > .hb-sticky {
    float: none;
    width: 100%;
    max-width: 22rem;
    margin: 0 0 1.25rem;
  }
}

/* Yellow sticky-note callout (version heads-up, etc.) */
.hb-sticky {
  position: relative;
  max-width: 28rem;
  margin: 0.75rem 0 1.75rem;
  padding: 1.1rem 1.15rem 1.2rem;
  background:
    linear-gradient(180deg, #fff7a8 0%, #ffe566 72%, #f5d84a 100%);
  border: none;
  border-radius: 0;
  box-shadow:
    2px 3px 0 rgba(120, 90, 20, 0.12),
    4px 8px 18px rgba(80, 60, 10, 0.18);
  color: #3a3218;
  font-size: 0.74rem;
  line-height: 1.5;
  transform: rotate(-1.2deg);
  transform-origin: top left;
}
.hb-sticky::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 1.35rem;
  height: 1.35rem;
  background:
    linear-gradient(225deg, transparent 48%, rgba(0, 0, 0, 0.08) 48%),
    linear-gradient(225deg, #f4f0e6 50%, transparent 50%);
  box-shadow: -1px 1px 2px rgba(80, 60, 10, 0.12);
}
.hb-sticky p { margin: 0 0 0.65rem; }
.hb-sticky p:last-child { margin-bottom: 0; }
.hb-sticky strong { color: #5a3e00; }

@media (max-width: 720px) {
  .hb-sticky {
    max-width: none;
    transform: rotate(-0.6deg);
  }
}

/* Secondary detail — quieter than .hb-tip */
.hb-further {
  margin: 0.65rem 0 0;
  padding: 0.45rem 0 0.45rem 0.75rem;
  border-left: 2px solid var(--panel-edge);
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--muted);
}
.hb-further strong { font-weight: 600; color: #5a5868; }
.hb-further a { color: #4a6a82; }

/* Gesture code reference */
.hb-gest {
  display: inline-block;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  background: #f0f0f0;
  border: 1px solid var(--panel-edge);
  border-radius: 0;
  padding: 0.05rem 0.4rem;
  font-size: 0.85em;
  color: #4b2382;
  font-weight: 600;
}


/* ======================================================================
   BRAND PASS — light theme, TŒRN wordmark via Bebas Neue,
   brand-aligned accents (cyan topline + red highlight) on a clean white UI.
   ====================================================================== */

/* ---------- Inline product name (body type, not logo) ---------- */
.hb-brand {
  font: inherit;
  letter-spacing: inherit;
  text-transform: none;
  color: inherit;
  -webkit-text-stroke: 0;
  paint-order: normal;
}
.hb-sidebar__logo {
  font-family: var(--font-logo);
  font-weight: 400;
  letter-spacing: -0.02em;
  font-size: 3.83rem;
  text-transform: uppercase;
  line-height: 1;
  color: #000;
  -webkit-text-stroke: 0.35px #000;
  paint-order: stroke fill;
}
.hb-sidebar__logo:hover { color: #000; }
.hb-sidebar__group {
  font-family: var(--font-tech);
  letter-spacing: 0.22em;
  font-size: 0.6rem;
}

.hb-hero {
  background:
    linear-gradient(135deg, rgba(46, 185, 255, 0.07), rgba(255, 59, 48, 0.04) 70%, transparent),
    #ffffff;
  border: 1px solid var(--panel-edge);
  padding: 1.4rem 1.5rem 1.2rem;
  position: relative;
  overflow: hidden;
}
.hb-hero--compact { padding: 0.9rem 1.5rem 0.8rem; }
.hb-hero--compact .hb-hero__title,
.hb-hero--compact .hb-hero__title a { font-size: clamp(2.4rem, 5vw, 3.4rem); line-height: 1; }
.hb-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 28%, rgba(46, 185, 255, 0.18), transparent 45%),
    radial-gradient(circle at 84% 78%, rgba(255, 59, 48, 0.12), transparent 50%);
  pointer-events: none;
}
.hb-hero > * { position: relative; }
.hb-hero__eyebrow {
  font-family: var(--font-tech);
  color: var(--brand-topline);
  letter-spacing: 0.28em;
}
.hb-hero__title,
.hb-hero__title a {
  font-family: var(--font-logo);
  font-weight: 400;
  font-size: clamp(2.6rem, 5.5vw, 3.6rem);
  letter-spacing: -0.02em;
  color: #000;
  text-transform: uppercase;
  line-height: 1;
  margin: 0.2rem 0 0;
}
.hb-hero__title a:hover { color: #000; }

/* ---------- Headings & body refinements ---------- */
h2 {
  font-family: var(--font-logo);
  font-weight: 400;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: #000;
}
h2 span:not(.hb-brand):not(.hb-mention) { color: var(--brand-red); }
h2 .hb-mention,
h2 .hb-mention .hb-ico { color: inherit; }

code, .hb-gest {
  font-family: var(--font-tech);
  background: rgba(46, 185, 255, 0.08);
  border: 1px solid rgba(46, 185, 255, 0.22);
  color: #0c5a82;
  border-radius: 0;
  padding: 0.05rem 0.4rem;
  font-size: 0.85em;
  font-weight: 500;
}

/* ---------- Sidebar ---------- */
.hb-sidebar { background: var(--sidebar-bg); border-right: 1px solid var(--sidebar-line); }
.hb-sidebar__link--active {
  background: var(--sidebar-active-bg);
  border: none;
}
.hb-sidebar__link:hover {
  background: var(--sidebar-hover-bg);
}

/* ---------- Pager ---------- */
.hb-pager__dir { font-family: var(--font-tech); }

/* ---------- Reference cards ---------- */
.hb-ref-card:hover {
  border-color: rgba(46, 185, 255, 0.45);
  background: rgba(46, 185, 255, 0.04);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(14, 22, 34, 0.08);
}

/* ---------- Callouts (re-tuned to match brand) ---------- */
.hb-tip {
  background: linear-gradient(135deg, rgba(46, 185, 255, 0.1), rgba(52, 199, 89, 0.08));
  border: 1px solid rgba(46, 185, 255, 0.3);
}
.hb-tip strong { color: #0c5a82; }
.hb-warn {
  background: linear-gradient(135deg, rgba(255, 59, 48, 0.08), rgba(255, 140, 0, 0.05));
  border: 1px solid rgba(255, 59, 48, 0.32);
}
.hb-warn strong { color: var(--brand-red); }
.note {
  background: linear-gradient(135deg, rgba(46, 185, 255, 0.1), rgba(255, 59, 48, 0.06));
}

/* ---------- Encoders: neutral (RGB-lit, no fixed colour) ----------
   The encoder rings on the device are full-colour RGB LEDs whose colour
   changes per page/voice. Don't pin them to voice colours in the cheat-sheet. */
.enc--1 .enc__n,
.enc--2 .enc__n,
.enc--3 .enc__n,
.enc--4 .enc__n,
.hb-enc--1 .kn,
.hb-enc--2 .kn,
.hb-enc--3 .kn,
.hb-enc--4 .kn {
  background: linear-gradient(135deg, #2eb9ff 0%, #34c759 35%, #ffcc00 65%, #ff3b30 100%);
  color: #fff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  box-shadow: 0 0 0 2px rgba(14, 22, 34, 0.85) inset, 0 0 8px rgba(46, 185, 255, 0.25);
}

/* Audio-path SVG graphs */
.ap-graph {
  margin: 1rem 0 1.35rem;
  padding: 0.65rem 0.4rem 0.4rem;
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--panel-edge);
  -webkit-overflow-scrolling: touch;
}
.ap-svg { display: block; max-width: none; height: auto; }
.ap-nlabel {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 10px;
  font-weight: 700;
  pointer-events: none;
}
.ap-nsub, .ap-elabel {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 8px;
  pointer-events: none;
}
.ap-elabel { fill: #5b6878; }
.ap-node:hover rect { filter: brightness(0.97); }
.ap-code { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: 0.82em; }



/* TŒRN handbook: brand typography, neutral greys and chapter-group colours. */
:root {
  --page-bg: #ebebeb;
  --page-bg-deep: #e7e7e4;
  --surface: #ffffff;
  --card: var(--surface);
  --panel: #f4f4f2;
  --card-ink: #1a1a1c;
  --text: #3a3a40;
  --muted: #5e5e66;
  --panel-edge: #d3d3d0;
  --panel-edge-strong: #bcbcb9;
  --accent: #d92d24;
  --accent-strong: #b4211a;
  --accent-soft: #ff3b3014;
  --brand-red: #ff3b30;
  --brand-topline: #2eb9ff;
  --sidebar-bg: #f4f4f2;
  --sidebar-line: #d3d3d0;
  --sidebar-hover-bg: #e7e7e4;
  --sidebar-active-bg: #1a1a1c;
  --sidebar-w: 17rem;
  --hb-layout-max: 1600px;
  --font-display: "Bebas Neue", "Arial Narrow", Arial, sans-serif;
  --font-body: "Inter", Arial, sans-serif;
}
html { font-size: 100%; scroll-padding-top: 2rem; }
body { line-height: 1.7; }
p, ul, .lede, .enc__body, .hb-device__intro { color: var(--text); }
a { text-underline-offset: 0.2em; }
::selection { background: #ffcfb2; color: #1a1a1c; }
.hb-app { max-width: none; margin: 0; }
.hb-main__scroll { overflow-x: clip; }
.wrap { max-width: 76rem; margin: 0 auto; padding: 2.3rem clamp(1.5rem, 4.5vw, 4.5rem) 3rem; }
.hb-chapter-meta {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.75rem;
  padding-bottom: 1rem; margin-bottom: 3.4rem; border-bottom: 1px solid var(--panel-edge-strong);
  font: 400 0.65rem/1.5 var(--font-tech); letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted);
}
.hb-chapter-meta a { color: var(--text); text-decoration: none; }
.hb-chapter-meta a:hover { color: var(--accent); }
.hb-sidebar { scrollbar-width: thin; scrollbar-color: #bcbeb1 transparent; }
.hb-sidebar__brand { padding: 2rem 1.5rem 1.15rem; border-bottom: 0; margin-bottom: 0; }
.hb-sidebar__search {
  padding: 0 1.5rem 1.25rem;
  border-bottom: 1px solid var(--sidebar-line);
  margin-bottom: 0.7rem;
}
.hb-sidebar__search-input {
  background: #fff;
  border-color: var(--panel-edge);
  font: 400 0.78rem/1.35 var(--font-body);
  padding: 0.55rem 0.7rem;
}
.hb-sidebar__search-btn {
  width: 2.35rem;
  background: #1a1a1c;
  border-color: #1a1a1c;
  color: #fafaf4;
}
.hb-sidebar__search-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.hb-sidebar__logo { font-size: 3.2rem; }
.hb-sidebar__kicker { font: 400 0.6rem/1.6 var(--font-tech); letter-spacing: 0.2em; margin-top: 0.65rem; }

.hb-ask {
  margin: 0 0 2.5rem;
  padding: 0 0 2.25rem;
  border-bottom: 1px solid var(--panel-edge-strong);
}
.hb-ask__eyebrow {
  margin: 0 0 0.85rem;
  font: 400 0.62rem/1.5 var(--font-tech);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--section-ink, var(--muted));
}
.hb-ask__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.6rem, 5vw, 4.2rem);
  letter-spacing: 0.015em;
  text-transform: uppercase;
  line-height: 1.05;
  color: var(--card-ink);
}
.hb-ask__lede {
  margin: 0 0 1.5rem;
  max-width: 36rem;
  font-size: 1.02rem;
  color: var(--muted);
}
.hb-ask__form { margin: 0; }
.hb-ask__composer {
  background: var(--surface);
  border: 1px solid var(--panel-edge-strong);
  border-top: 3px solid var(--section-signal, var(--accent));
  box-shadow: 0 10px 28px rgba(26, 26, 28, 0.05);
}
.hb-ask__input {
  display: block;
  width: 100%;
  margin: 0;
  padding: 1.15rem 1.25rem 0.85rem;
  border: 0;
  resize: vertical;
  min-height: 4.5rem;
  background: transparent;
  color: var(--card-ink);
  font: 400 1.05rem/1.55 var(--font-body);
}
.hb-ask__input::placeholder { color: #8a8a92; }
.hb-ask__input:focus { outline: none; }
.hb-ask__composer:focus-within {
  border-color: var(--section-ink, var(--accent));
  box-shadow: 0 12px 32px rgba(26, 26, 28, 0.07);
}
.hb-ask__toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  padding: 0.75rem 1rem 0.9rem 1.25rem;
  border-top: 1px solid var(--panel-edge);
  background: var(--panel);
}
.hb-ask__hint {
  margin: 0;
  flex: 1 1 12rem;
  font: 400 0.68rem/1.45 var(--font-tech);
  letter-spacing: 0.04em;
  color: var(--muted);
}
.hb-ask__submit {
  appearance: none;
  margin: 0;
  padding: 0.65rem 1.25rem;
  border: 1px solid #1a1a1c;
  background: #1a1a1c;
  color: #fafaf4;
  font: 500 0.85rem/1 var(--font-body);
  letter-spacing: 0.02em;
  cursor: pointer;
}
.hb-ask__submit:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.hb-ask__submit:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.hb-search-results-section { margin: 0 0 2rem; }
.hb-search-status {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: 0.95rem;
}
.hb-search-status--err { color: #c52c24; }
.hb-search-status strong { color: var(--card-ink); font-weight: 600; }
.hb-search-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--panel-edge);
}
.hb-search-hit {
  margin: 0;
  border-bottom: 1px solid var(--panel-edge);
}
.hb-search-hit__link {
  display: grid;
  gap: 0.25rem;
  padding: 1.15rem 0.15rem 1.2rem;
  text-decoration: none;
  color: inherit;
}
.hb-search-hit__link:hover { background: var(--section-soft, var(--panel)); }
.hb-search-hit__link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.hb-search-hit__group {
  font: 400 0.6rem/1.4 var(--font-tech);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--section-ink, var(--muted));
}
.hb-search-hit__title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--card-ink);
  line-height: 1.15;
}
.hb-search-hit__section {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
}
.hb-search-hit__snip {
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--muted);
  max-width: 46rem;
}
.hb-search-hit mark {
  background: #ffcfb2;
  color: #1a1a1c;
  padding: 0 0.1em;
}
.hb-sidebar__section { background: transparent; padding-bottom: 0.8rem; }
.hb-sidebar__section .hb-sidebar__group {
  color: var(--muted); font: 500 0.62rem/1.5 var(--font-tech); letter-spacing: 0.08em;
  margin: 1.3rem 1.5rem 0.7rem;
}
.hb-sidebar__group span { color: var(--section-ink); }
.hb-sidebar__link { position: relative; grid-template-columns: 1rem 1fr; gap: 0.75rem; padding: 0.6rem 2.7rem 0.6rem 1.5rem; }
.hb-sidebar__link::after { content: attr(data-chapter); position: absolute; right: 1.1rem; top: 0.75rem; font: 400 0.58rem/1 var(--font-tech); color: var(--muted); }
.hb-sidebar__link-title { font-size: 0.8rem; font-weight: 500; letter-spacing: -0.01em; line-height: 1.4; }
.hb-sidebar__link-desc { font-size: 0.63rem; line-height: 1.4; margin-top: 0.15rem; color: var(--muted); }
.hb-sidebar__link-ico { color: var(--muted); margin-top: 0.1rem; }
.hb-sidebar__link:hover .hb-sidebar__link-ico { color: var(--accent); }
.hb-sidebar__section .hb-sidebar__link--active { background: var(--sidebar-active-bg); box-shadow: inset 3px 0 var(--section-signal); }
.hb-sidebar__section .hb-sidebar__link--active .hb-sidebar__link-title,
.hb-sidebar__section .hb-sidebar__link--active .hb-sidebar__link-ico { color: #fafaf4; }
.hb-sidebar__section .hb-sidebar__link--active .hb-sidebar__link-desc,
.hb-sidebar__link--active::after { color: #c1c3b5; }
.hb-sidebar__link--alert .hb-sidebar__link-title { color: var(--accent); }
.hb-sidebar__link--alert .hb-sidebar__link-desc { color: var(--muted); }
h2, .hb-sub > h2, .hb-sub > h3.hb-sub__title, .hb-subsection-heading {
  font-family: var(--font-display); font-weight: 400; font-size: clamp(1.6rem, 2.5vw, 2.1rem);
  line-height: 1.2; letter-spacing: 0.01em; text-transform: uppercase; -webkit-text-stroke: 0;
  color: var(--card-ink); margin-bottom: 1rem;
}
.handbook-page > .handbook-page__title, .wrap > header:not(.hb-hero) h1 {
  font-family: "Space Grotesk", sans-serif; font-weight: 400; font-size: clamp(3rem, 5.2vw, 4.7rem);
  text-transform: uppercase; letter-spacing: 0.015em; line-height: 1.04; -webkit-text-stroke: 0;
  color: var(--card-ink); margin: 0 0 1.5rem; text-wrap: balance;
}
.handbook-page__summary { font-size: 1.05rem; line-height: 1.7; max-width: 46rem; margin-bottom: 3.4rem; }
.hb-sub > p, .hb-sub > ul { max-width: 48rem; }
.hb-sub + hr, .hb-welcome-top + hr { margin: 3.5rem 0; border-color: var(--panel-edge-strong); }
.hb-device, .viz-panel { padding: 1.5rem; background: var(--surface); border-color: var(--panel-edge); }
.hb-device { margin: 1.5rem 0 2rem; border-top: 3px solid var(--section-signal); }
.hb-led-wrap { background: #20221e; padding: 1rem; border: 1px solid #3e4037; box-shadow: none; border-radius: 4px; }
.hb-led-label, .viz-caption, .viz-caption--below { color: var(--muted); font-size: 0.75rem; }
.hb-enc-grid { gap: 0; border: 1px solid var(--panel-edge); margin-top: 1.5rem; }
.hb-enc-card { background: transparent; border: 0; border-right: 1px solid var(--panel-edge); padding: 0.9rem 0.65rem; }
.hb-enc-card:last-child { border-right: 0; }
.hb-enc-card h5 { font: 500 0.68rem/1.4 var(--font-tech); margin-bottom: 1rem; }
.enc--1 .enc__n, .enc--2 .enc__n, .enc--3 .enc__n, .enc--4 .enc__n,
.hb-enc--1 .kn, .hb-enc--2 .kn, .hb-enc--3 .kn, .hb-enc--4 .kn {
  background: #292b25; color: #fafaf5; border-radius: 50%; box-shadow: none; text-shadow: none;
}
table.enc-act { font-size: 0.73rem; line-height: 1.65; }
table.enc-act tr { display: flex; flex-wrap: wrap; border-top: 1px solid var(--panel-edge); padding: 0.6rem 0; gap: 0.3rem; }
table.enc-act th, table.enc-act td { padding: 0; border: 0; background: transparent; }
table.enc-act th { flex: 0 0 28%; font: 500 0.64rem/1.8 var(--font-tech); color: var(--muted); }
table.enc-act td { flex: 1; min-width: 0; overflow-wrap: anywhere; }
table.enc-act td:nth-child(3) { flex: 0 0 100%; color: var(--muted); }
table.opt-table { font-size: 0.83rem; line-height: 1.6; }
table.opt-table th, table.opt-table td { padding: 0.7rem; border-width: 0 0 1px; }
table.opt-table th { background: var(--panel); }
code, .hb-gest { background: #e9eae2; border-color: #d6d8cc; color: #454b38; font-size: 0.8em; }
.hb-tip, .hb-warn, .note { background: #eeeee6; border: 1px solid var(--panel-edge); border-left: 3px solid #7b8662; padding: 1rem 1.2rem; }
.hb-warn { background: #f6e9df; border-left-color: var(--accent); }
.hb-tip strong, .note strong { color: #454e35; }
.hb-warn strong { color: var(--accent); }
.hb-sticky { transform: none; background: #f4f4f2; box-shadow: none; border: 1px solid var(--panel-edge); border-top: 3px solid var(--section-signal); padding: 1.2rem; font-size: 0.8rem; }
.hb-sticky::before { display: none; }
.hb-sticky strong { color: var(--card-ink); }
.hb-welcome-top { display: grid; grid-template-columns: minmax(0, 1fr) 16rem; gap: 0 2rem; }
.hb-welcome-top > .hb-sticky { float: none; grid-column: 2; grid-row: 1 / 3; width: 100%; max-width: none; margin: 0; align-self: start; }
.hb-welcome-top > p { grid-column: 1; margin: 0 0 1rem; }
.hb-welcome-top .lede { font-size: 1.05rem; }
.wrap > .hb-cover {
  display: grid; grid-template-columns: minmax(0, 1fr) 15rem; gap: 2rem; padding: 0 0 2.5rem;
  margin: 0 0 2.5rem; border-bottom: 1px solid var(--panel-edge-strong);
}
.hb-cover__copy { display: flex; flex-direction: column; }
.hb-cover__label { font: 400 0.62rem/1.5 var(--font-tech); text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); margin: 0 0 1.5rem; }
.wrap > .hb-cover h1 { font-size: clamp(3rem, 5.8vw, 5.5rem); max-width: 8em; margin: 0; }
.hb-cover__bottom { display: flex; justify-content: space-between; align-items: end; margin-top: auto; padding-top: 2.5rem; }
.hb-cover__bottom > span:first-child { font: 500 1.6rem/1 var(--font-display); letter-spacing: 0.02em; }
.hb-cover__bottom > span:last-child { font: 400 0.62rem/1.6 var(--font-tech); text-align: right; color: var(--muted); }
.hb-cover__matrix { aspect-ratio: var(--matrix-ratio, 2); padding: .75rem; background: #0e0e12; border-radius: 3px; align-self: center; }
.hb-cover__matrix canvas.led-matrix { display: block; width: 100%; height: auto; aspect-ratio: var(--matrix-ratio, 2); margin: 0; }
.hb-steps { gap: 0; }
.hb-step { grid-template-columns: 3rem 1fr; gap: 1rem; padding: 1.5rem 0; border-top: 1px solid var(--panel-edge); }
.hb-step::before { background: transparent; color: var(--accent); border: 1px solid var(--panel-edge-strong); border-radius: 0; font: 400 0.85rem/1 var(--font-tech); content: counter(hbstep, decimal-leading-zero); }
.hb-step h4 { font-family: var(--font-display); font-size: 1.2rem; font-weight: 500; }
.hb-step p { font-size: 0.95rem; }
.hb-pager { margin-top: 3.5rem; padding-top: 1.25rem; border-color: var(--panel-edge-strong); }
.hb-pager__link { min-height: 3rem; }
.hb-pager__name { font: 500 0.95rem/1.5 var(--font-display); }
.hb-ref-card:hover, .hb-card__link:hover { background: var(--panel); border-color: var(--panel-edge-strong); box-shadow: none; transform: none; }
.hb-faq details[open] { border-color: var(--panel-edge-strong); box-shadow: none; }
.hb-faq summary { min-height: 2rem; }
.hb-faq summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
@media (min-width: 901px) {
  .hb-sidebar { position: sticky; top: 0; height: 100dvh; overflow-y: auto; align-self: start; overscroll-behavior: contain; }
}
@media (min-width: 901px) and (max-width: 1200px) {
  .hb-enc-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hb-enc-card:nth-child(2n) { border-right: 0; }
  .hb-enc-card:nth-child(n+3) { border-top: 1px solid var(--panel-edge); }
  .hb-welcome-top { grid-template-columns: 1fr; }
  .hb-welcome-top > .hb-sticky { grid-column: 1; grid-row: auto; margin-bottom: 1.5rem; }
}
@media (max-width: 900px) {
  :root { --hb-mobile-bar-h: 4rem; }
  html { scroll-padding-top: calc(var(--hb-mobile-bar-h) + 1rem); }
  .wrap { padding: 1.5rem 1.25rem 2rem; }
  .hb-chapter-meta { margin-bottom: 2rem; font-size: 0.58rem; }
  .hb-mobile-bar { background: var(--page-bg); padding-left: 1.25rem; padding-right: 0.6rem; }
  .hb-mobile-bar__kicker { font-family: var(--font-tech); font-size: 0.58rem; }
  .hb-sidebar { box-shadow: 8px 0 32px #1a1a1c20; }
  .hb-sidebar__link { padding-top: 0.75rem; padding-bottom: 0.75rem; }
  .hb-sidebar__link-title { font-size: 0.9rem; }
  .hb-sidebar__link-desc { font-size: 0.7rem; }
  .handbook-page__summary { font-size: 0.98rem; margin-bottom: 2.5rem; }
  .hb-device { padding: 1rem; }
  .hb-enc-card:nth-child(2n) { border-right: 0; }
  .hb-enc-card:nth-child(n+3) { border-top: 1px solid var(--panel-edge); }
  .hb-welcome-top { grid-template-columns: 1fr; }
  .hb-welcome-top > .hb-sticky { grid-column: 1; grid-row: auto; margin-bottom: 1.5rem; }
  .wrap > .hb-cover { grid-template-columns: minmax(0, 1fr) 10rem; gap: 1.5rem; }
  .wrap > .hb-cover h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
}
@media (max-width: 540px) {
  .wrap > .hb-cover { grid-template-columns: 1fr; }
  .hb-cover__matrix { width: 100%; max-width: 15rem; justify-self: end; }
  .hb-cover__bottom { padding-top: 1.5rem; }
  .hb-enc-grid { grid-template-columns: 1fr; }
  .hb-enc-card { border-right: 0; }
  .hb-enc-card + .hb-enc-card { border-top: 1px solid var(--panel-edge); }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}
.wrap a:not([class]), .handbook-page__summary a { color: var(--accent); }
.wrap a:not([class]):hover, .handbook-page__summary a:hover { color: var(--accent-strong); }
.hb-enc-card h5 .kn { background: #292b25; color: #fafaf5; border-radius: 50%; }

/* Group colours repeat in navigation, chapter rules and interaction accents. */
:root, body[data-hb-section="start"], .hb-sidebar__section--start {
  --section-signal: #2eb9ff;
  --section-ink: #08749e;
  --section-soft: #2eb9ff12;
}
body[data-hb-section="compose"], .hb-sidebar__section--compose {
  --section-signal: #ff3b30;
  --section-ink: #c52c24;
  --section-soft: #ff3b3010;
}
body[data-hb-section="operate"], .hb-sidebar__section--operate {
  --section-signal: #34c759;
  --section-ink: #21743a;
  --section-soft: #34c75912;
}
body { --accent: var(--section-ink); --accent-strong: var(--section-ink); --accent-soft: var(--section-soft); }
.hb-sidebar__section { background: var(--section-soft); }
.hb-sidebar__section .hb-sidebar__group { color: var(--section-ink); }
.hb-sidebar__link:hover { background: var(--section-soft); }
.hb-chapter-meta { border-bottom: 2px solid var(--section-signal); }
.hb-chapter-meta > span { color: var(--section-ink); }
.hb-tip, .note { background: var(--section-soft); border-left-color: var(--section-signal); }
.hb-tip strong, .note strong { color: var(--section-ink); }
.hb-warn { background: #ff3b300c; border-left-color: #ff3b30; }
.hb-warn strong { color: #c52c24; }
.hb-cover__label { color: var(--section-ink); }
.hb-cover__bottom > span:first-child { font-family: var(--font-logo); font-size: 2.2rem; }
.hb-step h4 { font-weight: 400; font-size: 1.5rem; letter-spacing: 0.015em; }
.hb-pager__name { font-family: var(--font-body); }

/* Panel selection changes the actual LED count, preserving square pixel spacing. */
.hb-chapter-meta { align-items: center; }
.hb-layout-choice { display: flex; align-items: center; gap: .4rem; margin-left: auto; }
.hb-layout-choice > span { margin-right: .3rem; }
.hb-layout-choice button { font: inherit; color: var(--text); background: transparent; border: 1px solid var(--panel-edge-strong); border-radius: 3px; padding: .45rem .6rem; min-height: 36px; cursor: pointer; }
.hb-layout-choice button[aria-pressed="true"] { color: #fff; background: var(--card-ink); border-color: var(--card-ink); }
.hb-layout-choice button:focus-visible { outline: 2px solid var(--section-signal); outline-offset: 3px; }
canvas.led-matrix, .hb-led-wrap canvas.led-matrix { aspect-ratio: var(--matrix-ratio, 2); }
.hb-led-wrap, .hb-led-row .hb-led-wrap { aspect-ratio: auto; }
html[data-matrix-width="32"] .hb-led-wrap { width: min(28rem, 100%); }
html[data-matrix-width="32"] .hb-led-row .hb-led-wrap { width: min(22rem, 100%); }
html[data-matrix-width="32"] canvas.led-matrix { max-width: 100%; }
html[data-matrix-width="32"] .wrap > .hb-cover { grid-template-columns: minmax(0, 1fr) minmax(12rem, 22rem); }
@media (min-width: 901px) and (max-width: 1200px) {
  html[data-matrix-width="32"] .wrap > .hb-cover { grid-template-columns: minmax(0, 1fr); }
  html[data-matrix-width="32"] .hb-cover__matrix { width: 100%; max-width: 22rem; justify-self: start; }
}
@media (max-width: 900px) {
  .hb-chapter-meta { gap: .75rem; }
  .hb-layout-choice { flex-basis: 100%; margin: 0; }
  html[data-matrix-width="32"] .wrap > .hb-cover { grid-template-columns: minmax(0, 1fr); }
  html[data-matrix-width="32"] .hb-cover__matrix { max-width: 22rem; justify-self: start; }
}