/* NetLab: quiet surfaces, a single teal action colour and a 4px spacing scale. */
:root {
  color-scheme: light;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --f-disp: 'Barlow', 'Segoe UI', system-ui, sans-serif;
  --bg: #eef2f3;
  --chrome: #f8fafb;
  --panel: #ffffff;
  --panel-2: #f1f5f5;
  --fg: #182f35;
  --muted: #52676e;
  --faint: #60767d;
  --accent: #087b72;
  --accent-2: #06665f;
  --accent-soft: #e0f2ee;
  --ok: #17713d;
  --warn: #8b5c00;
  --bad: #b52e3a;
  --canvas: #f4f7f7;
  --grid: #d2dede;
  --shadow: 0 2px 4px #152f3510, 0 12px 32px #152f350c;
}
:root[data-theme='dark'] {
  color-scheme: dark;
  --faint: #9cb3b5;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    color-scheme: dark;
    --faint: #9cb3b5;
  }
}
body {
  font-size: 14px;
  line-height: 1.5;
}
button,
a,
input,
select,
textarea {
  -webkit-tap-highlight-color: transparent;
}
button {
  transition:
    background-color 0.15s,
    border-color 0.15s;
}
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}
#app {
  grid-template-columns: 216px minmax(0, 1fr) min(var(--insp-w, 368px), 60vw);
  grid-template-rows: 72px minmax(0, 1fr) min(var(--sim-h, 216px), 65vh);
}
.top {
  gap: 8px;
  padding-inline: 24px;
  background: var(--panel);
}
.brand {
  gap: 12px;
}
.brand-copy {
  display: grid;
  gap: 5px;
}
.brand h1 {
  font: 600 24px/1 var(--f-body);
  letter-spacing: -0.6px;
}
.brand h1 small {
  font: 500 10px var(--f-mono);
  color: var(--muted);
  letter-spacing: 0;
  margin-left: 6px;
}
.brand span {
  text-transform: none;
  letter-spacing: 0;
  font: 400 12px/1.3 var(--f-body);
}
.btn {
  height: 36px;
  font: 600 13px/1 var(--f-body);
  letter-spacing: 0;
  border-radius: 9px;
}
.btn.sm {
  min-height: 30px;
  font-size: 12px;
}
.btn.ghost {
  color: var(--muted);
}
.btn.primary {
  box-shadow: 0 2px 4px #082d2b12;
}
.pal {
  padding: 20px 12px;
  gap: 24px;
}
.pal h2 {
  font: 600 10px/1.2 var(--f-body);
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}
.pal-item {
  padding: 10px 4px;
  border: 1px solid var(--line);
  background: var(--panel);
}
.pal-item span {
  font: 500 12px/1.2 var(--f-body);
}
.pal-item:hover {
  border-color: var(--accent);
}
.pal-item .pi {
  width: 38px;
  height: 38px;
  border: 0;
}
.pal-item .pi svg {
  width: 27px;
  height: 27px;
}
#palVendor,
.theme-field select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px;
  background: var(--panel);
  font-size: 12px;
  height: 38px;
}
.cable-btn b {
  font-size: 12px;
}
.cable-btn small {
  font-size: 11px;
}
.insp {
  background: var(--panel);
}
.insp-head {
  padding: 16px 12px;
  background: var(--panel);
}
.seg {
  padding: 3px;
  gap: 2px;
  border-radius: 9px;
}
.seg button {
  font: 600 11px/1.3 var(--f-body);
  padding: 7px 10px;
}
.insp-body {
  padding: 24px 20px;
  gap: 24px;
}
.sec {
  gap: 12px;
}
.sec > h3 {
  font-size: 10px;
  letter-spacing: 0.1em;
}
.welcome h2 {
  font: 600 30px/1.12 var(--f-body);
  letter-spacing: -1px;
  margin: 8px 0 4px;
  max-width: 15ch;
}
.welcome > p {
  font-size: 14px;
  line-height: 1.6;
}
.eyebrow {
  color: var(--accent);
  font: 600 10px/1 var(--f-body);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.welcome {
  padding: 20px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, var(--accent-soft), var(--panel));
}
.welcome .btn {
  justify-content: center;
  margin-top: 8px;
}
.steps {
  gap: 14px;
}
.steps li {
  font-size: 13px;
}
.try button {
  padding: 12px;
  font-size: 12px;
}
.try code {
  font-size: 11px;
}
.toolbar {
  top: 56px;
  left: 16px;
}
.zoomrow {
  top: 56px;
  right: 16px;
}
.canvas-caption {
  position: absolute;
  inset: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  height: 44px;
  padding: 0 20px;
  color: var(--muted);
  font-size: 11px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  pointer-events: none;
}
.canvas-caption b {
  color: var(--fg);
  font-weight: 600;
}
#networkStats {
  margin-left: auto;
  font-family: var(--f-mono);
  font-size: 10px;
}
.status-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}
.canvas-footer {
  position: absolute;
  inset: auto 0 0;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 16px;
  font-size: 10px;
  color: var(--muted);
  background: var(--panel);
  border-top: 1px solid var(--line);
  pointer-events: none;
}
.canvas-empty {
  position: absolute;
  inset: 120px 16px 60px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  justify-content: center;
  text-align: center;
  pointer-events: none;
}
.canvas-empty h1 {
  font: 600 28px/1.15 var(--f-body);
  letter-spacing: -0.6px;
  margin: 0;
}
.canvas-empty p {
  margin: 0;
  color: var(--muted);
  max-width: 35ch;
}
.canvas-empty button {
  pointer-events: auto;
}
.dev:focus-visible .halo {
  stroke: var(--accent);
  stroke-width: 3px;
  fill: none;
}
.dev:focus-visible {
  outline: none;
}
.dname {
  font-size: 13px;
  font-weight: 600;
}
.dip {
  font-size: 10px;
}
.simhead {
  padding: 12px 16px;
  gap: 6px;
  background: var(--panel);
}
.clock {
  font-size: 10px;
}
.evdetail {
  padding: 16px;
}
.evrow {
  font-size: 11px;
  min-height: 30px;
}
.lesson {
  padding: 16px;
  gap: 12px;
}
.lesson h4 {
  font-size: 17px;
  line-height: 1.3;
}
.lesson:not(.active) .primary {
  background: var(--panel);
  color: var(--accent);
  border-color: var(--line);
  box-shadow: none;
}
.learning-summary {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
}
.learning-summary progress {
  accent-color: var(--accent);
  width: 100px;
  height: 6px;
}
.theme-field {
  display: grid;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
}
.modal-bg {
  width: 100vw;
  height: 100dvh;
  max-width: none;
  max-height: none;
  border: 0;
  margin: 0;
  color: var(--fg);
  background: transparent;
}
.modal-bg::backdrop {
  background: #051b22aa;
  backdrop-filter: blur(3px);
}
.modal {
  padding: 28px;
  gap: 16px;
}
.modal p {
  margin: 0;
  color: var(--muted);
}
.modal textarea {
  width: 100%;
}
.modal .row {
  flex-wrap: wrap;
}
.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  padding: 12px;
  background: var(--panel);
  color: var(--accent);
  z-index: 200;
}
.skip-link:focus {
  top: 12px;
}
.mobile-nav {
  display: none;
}
#stage {
  scroll-margin-top: 80px;
}
@media (max-width: 1180px) and (min-width: 901px) {
  #app {
    grid-template-columns: 180px minmax(0, 1fr) min(var(--insp-w, 320px), 55vw);
  }
  .top {
    padding-inline: 16px;
  }
  .brand span {
    display: none;
  }
  .canvas-footer > span:last-child {
    display: none;
  }
  .zoomrow {
    top: auto;
    bottom: 48px;
  }
  .toolbar {
    max-width: calc(100% - 32px);
  }
}
@media (max-width: 900px) {
  body {
    overflow: hidden;
  }
  #app {
    height: calc(100dvh - 60px);
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto 148px minmax(0, 1fr);
    grid-template-areas: 'top' 'pal' 'stage';
  }
  .top {
    padding: 12px;
    gap: 4px;
  }
  .brand {
    width: 100%;
    margin-bottom: 8px;
  }
  .brand svg {
    width: 28px;
    height: 28px;
  }
  .brand h1 {
    font-size: 22px;
  }
  .brand span {
    display: block;
  }
  .brand-copy {
    display: flex;
    align-items: baseline;
    gap: 12px;
  }
  .brand h1 small {
    display: none;
  }
  .top .btn {
    padding: 0 9px;
    font-size: 12px;
    min-height: 36px;
  }
  .top #btnUndo,
  .top #btnRedo {
    width: 32px;
    padding: 0 6px;
  }
  .top #btnSettings svg {
    display: none;
  }
  .topmenu {
    margin-left: auto;
  }
  .pop {
    position: fixed;
    right: 12px;
    top: 112px;
    max-width: calc(100vw - 24px);
  }
  .pal {
    display: flex;
    height: 148px;
    padding: 12px;
    gap: 16px;
  }
  .pal h2 {
    margin-bottom: 8px;
  }
  .pal-item {
    width: 72px;
    padding: 8px 4px;
    min-height: 82px;
  }
  .pal-grid {
    gap: 6px;
  }
  .pal .cables {
    align-items: start;
  }
  .pal .cable-btn {
    min-height: 76px;
  }
  .insp,
  .sim {
    display: none;
    min-height: 0;
  }
  .mobile-nav {
    position: fixed;
    inset: auto 0 0;
    height: 60px;
    display: flex;
    align-items: center;
    padding: 6px 12px;
    gap: 8px;
    border-top: 1px solid var(--line);
    background: var(--panel);
    z-index: 30;
  }
  .mobile-nav button {
    flex: 1;
    min-height: 44px;
    border-radius: 10px;
    border: 0;
    color: var(--muted);
    background: transparent;
    font-size: 12px;
    font-weight: 600;
  }
  .mobile-nav button[aria-pressed='true'] {
    background: var(--accent-soft);
    color: var(--accent);
  }
  body[data-mobile-view='inspect'] #app {
    grid-template-rows: auto minmax(0, 1fr);
    grid-template-areas: 'top' 'insp';
  }
  body[data-mobile-view='sim'] #app {
    grid-template-rows: auto minmax(0, 1fr);
    grid-template-areas: 'top' 'sim';
  }
  body[data-mobile-view='inspect'] .insp,
  body[data-mobile-view='sim'] .sim {
    display: flex;
    flex-direction: column;
  }
  body:not([data-mobile-view='build']) .pal,
  body:not([data-mobile-view='build']) .stage-wrap {
    display: none;
  }
  .insp-body {
    overflow: auto;
    flex: 1;
  }
  .simbody {
    flex: 1;
    min-height: 0;
  }
  .simhead {
    flex-wrap: wrap;
  }
  .canvas-caption {
    padding-inline: 12px;
  }
  .canvas-footer > span:last-child {
    display: none;
  }
  .zoomrow {
    top: auto;
    bottom: 44px;
  }
  .toolbar {
    top: 56px;
    left: 12px;
    gap: 0;
    padding: 3px;
  }
  .tb {
    width: 32px;
    height: 36px;
  }
  .canvas-empty {
    top: 110px;
  }
  .toasts {
    position: fixed;
    bottom: 76px;
    max-width: calc(100vw - 32px);
  }
  .modal {
    padding: 20px;
  }
  .modal textarea {
    height: 180px;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.brand h1 {
  margin: 0;
}
.chip.off {
  opacity: 1;
  color: var(--muted);
  border-style: dashed;
}
.boot-status {
  position: fixed;
  inset: 0;
  z-index: 150;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 16px;
  padding: 24px;
  background: var(--panel);
  color: var(--fg);
  text-align: center;
}

.ptag[class*='paint-'] {
  background: var(--panel-2);
  color: var(--fg);
  border-left: 3px solid var(--swatch);
}
@media (max-width: 480px) {
  .top #btnNew svg,
  .top #btnSample svg,
  .top #btnIO svg {
    display: none;
  }
}

.vendorbar[class*='vendor-'] {
  background: var(--panel-2);
  color: var(--fg);
  border-left: 3px solid var(--vendor-mark);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}