[hidden] {
  display: none !important;
}
/* Read by screen readers, not shown. */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
:root {
  --bg: #f6f5f1;
  --card: #ffffff;
  --ink: #1d1d1b;
  --quiet: #6b6a64;
  --line: #dddbd3;
  --accent: #2a63c7;
  --ok: #1d7444;
  --bad: #c2412d;
  --warn: #8f5d0c;
  --on-accent: #ffffff;
  --on-bad: #ffffff;
  --code-bg: #f1efe8;
  --ch1: #2f6fdb;
  --ch2: #e0662f;
  --ch3: #2ea672;
  --ch4: #1f3a68;
  --ch5: #9a5bd1;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a19;
    --card: #232321;
    --ink: #ecebe6;
    --quiet: #a3a29b;
    --line: #3a3a37;
    --accent: #6b9cf0;
    --ok: #5cc28d;
    --bad: #f07a63;
    --warn: #e0b04f;
    --on-accent: #0f1d36;
    --on-bad: #2b0c06;
    --code-bg: #2b2b29;
    --ch1: #6b9cf0;
    --ch2: #f08a5a;
    --ch3: #5cc28d;
    --ch4: #a9bde6;
    --ch5: #c093ec;
  }
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font:
    15px/1.5 -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    system-ui,
    sans-serif;
}
main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 16px 64px;
}
header.top {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  margin: 0 -16px 20px;
  padding: 12px 16px;
}
.top-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}
h1 {
  font-size: 20px;
  margin: 0;
  margin-right: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo {
  flex: none;
}
h2 {
  font-size: 17px;
  margin: 0;
}
.card > h2 {
  margin-bottom: 8px;
}
h3 {
  font-size: 14px;
  margin: 16px 0 8px;
  color: var(--quiet);
  font-weight: 600;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 16px;
}
.badge {
  font-size: 12px;
  padding: 1px 8px;
  border-radius: 99px;
  border: 1px solid var(--line);
  color: var(--quiet);
}
.badge.sim {
  border-color: var(--warn);
  color: var(--warn);
}
p {
  margin: 6px 0;
}
.note {
  color: var(--quiet);
  font-size: 13px;
}
button {
  font: inherit;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  border-radius: 8px;
  padding: 7px 13px;
  cursor: pointer;
}
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
button.danger {
  background: var(--bad);
  border-color: var(--bad);
  color: var(--on-bad);
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
button.small {
  padding: 3px 9px;
  font-size: 13px;
}
button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
input,
select {
  max-width: 100%;
  font: inherit;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 8px;
}
input[type='number'] {
  width: 64px;
}
input[type='time'] {
  width: 8.5em; /* room for AM/PM in English */
}
input[type='range'] {
  width: 100%;
}
.row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin: 8px 0;
}
.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--quiet);
}
.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--line);
}
.dot.on {
  background: var(--ok);
}
.obs {
  border-top: 1px dashed var(--line);
  margin-top: 14px;
  padding-top: 10px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}
.obs input[type='text'] {
  flex: 1;
  min-width: 200px;
}
.obs .saved {
  font-size: 13px;
  color: var(--ok);
}
.last {
  font-size: 13px;
  margin-top: 6px;
}
.last.ok {
  color: var(--ok);
}
.last.bad {
  color: var(--bad);
}
.sliders {
  display: grid;
  grid-template-columns: 48px 1fr 56px;
  gap: 6px 12px;
  align-items: center;
  max-width: 560px;
}
.sliders label {
  font-weight: 600;
}
.sliders output {
  font-variant-numeric: tabular-nums;
  text-align: right;
}
#log {
  height: 300px;
  overflow: auto;
  background: var(--code-bg);
  border-radius: 8px;
  padding: 8px;
  font:
    12px/1.6 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
}
.log-row {
  display: grid;
  grid-template-columns: 150px 52px 40px 1fr;
  gap: 8px;
}
.log-time,
.log-test {
  color: var(--quiet);
}
.log-kind {
  font-weight: 600;
}
.log-text {
  word-break: break-all;
}
.k-tx .log-kind {
  color: var(--accent);
}
.k-ack .log-kind,
.k-obs-ok .log-kind {
  color: var(--ok);
}
.k-nack .log-kind,
.k-error .log-kind,
.k-obs-bad .log-kind {
  color: var(--bad);
}
.k-session {
  border-top: 1px solid var(--line);
  margin-top: 4px;
  padding-top: 4px;
}
#drop {
  border: 1.5px dashed var(--line);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
  color: var(--quiet);
}
#drop.over {
  border-color: var(--accent);
  color: var(--ink);
}
#drop label {
  color: var(--accent);
  cursor: pointer;
  text-decoration: underline;
}
.modes {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 8px 0;
}
.mode-item {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  padding: 6px 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.mode-item.sel {
  border-color: var(--accent);
}
.mode-item .meta {
  color: var(--quiet);
  font-size: 13px;
  margin-right: auto;
}
.warnings {
  color: var(--warn);
  margin: 6px 0;
  padding-left: 20px;
  font-size: 13px;
}
.chart svg {
  width: 100%;
  height: auto;
  display: block;
}
.chart .grid {
  stroke: var(--line);
  stroke-width: 1;
}
.chart .tick {
  fill: var(--quiet);
  font-size: 11px;
}
.legend {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 13px;
}
.legend i {
  width: 16px;
  height: 3px;
  border-radius: 2px;
  display: inline-block;
  margin-right: 5px;
  vertical-align: middle;
}
.table-wrap {
  overflow-x: auto;
  position: relative; /* keeps the hidden .sr-only header text inside the scroller */
}
table {
  border-collapse: collapse;
  font-size: 13px;
}
th,
td {
  text-align: left;
  padding: 3px 6px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
th {
  color: var(--quiet);
  font-weight: 600;
}
td.jumps label {
  margin-right: 6px;
  font-size: 12px;
  color: var(--quiet);
}
code {
  background: var(--code-bg);
  padding: 1px 4px;
  border-radius: 4px;
}
.warn-box {
  background: color-mix(in srgb, var(--bad) 12%, transparent);
  border: 1px solid var(--bad);
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 16px;
}
.sim-box {
  background: color-mix(in srgb, var(--warn) 14%, transparent);
  border: 1px solid var(--warn);
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 16px;
}
a {
  color: var(--accent);
}
.lead {
  margin: 0 0 16px;
  color: var(--quiet);
}
/* Collapsible cards (Settings, Advanced): the h2 sits inside the summary. */
details.fold > summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  color: inherit;
}
details.fold > summary::-webkit-details-marker {
  display: none;
}
details.fold > summary::before {
  content: '▸';
  font-size: 18px;
  line-height: 1;
  color: var(--quiet);
  transition: transform 0.15s;
}
details.fold[open] > summary::before {
  transform: rotate(90deg);
}
details.fold > summary h2 {
  margin: 0;
}
details.fold[open] > summary {
  margin-bottom: 8px;
}
details summary {
  cursor: pointer;
  color: var(--quiet);
}
.progress {
  font-variant-numeric: tabular-nums;
}
.warn-text {
  color: var(--warn);
}
.mode-item .badge {
  font-size: 11px;
}
.badge.safe {
  border-color: var(--ok);
  color: var(--ok);
}
.badge.danger {
  border-color: var(--bad);
  color: var(--bad);
}
.mode-item .actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.spacer {
  flex: 1;
}
.editor-svg {
  width: 100%;
  height: auto;
  display: block;
  touch-action: none;
  user-select: none;
}
.editor-svg .grid {
  stroke: var(--line);
  stroke-width: 1;
}
.editor-svg .tick {
  fill: var(--quiet);
  font-size: 11px;
}
.preview {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  margin: 8px 0;
  background: var(--code-bg);
}
.preview .grow {
  flex: 1;
  min-width: 160px;
  display: flex;
}
.preview .grow input {
  flex: 1;
}
#preview-clock {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  min-width: 3.5em;
}
.seg {
  display: inline-flex;
  gap: 4px;
  flex-wrap: wrap;
}
.seg label {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px 8px;
  cursor: pointer;
  background: var(--card);
}
.seg label:has(input:checked) {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}
.seg label:has(input:focus-visible) {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.seg input {
  margin: 0 4px 0 0;
}
.editor-svg .play-cursor {
  stroke: var(--ink);
  stroke-width: 2;
  pointer-events: none;
}
.editor-svg .now-line {
  stroke: var(--quiet);
  stroke-dasharray: 3 3;
}
.editor-svg .chart-hit {
  fill: transparent;
  cursor: crosshair;
}
.editor-svg .step-point {
  stroke: var(--card);
  stroke-width: 2;
  cursor: grab;
}
.editor-svg .step-point:hover,
.editor-svg .step-point:focus,
.editor-svg .step-point.focused {
  stroke: var(--ink);
  stroke-width: 2.5;
  outline: none;
}
#editor-table tr.focused td {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}
.level-field {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.level-field input[type='range'] {
  width: 140px;
}
.channel-cell {
  white-space: nowrap;
}
.seg-toggle {
  margin-left: 4px;
  min-width: 64px;
}
.seg-toggle.on {
  background: var(--ink);
  color: var(--card);
  border-color: var(--ink);
}
svg.swatch {
  display: inline-block;
  margin-right: 5px;
  vertical-align: middle;
}
.channel-btn.on {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}
.warnings .lead {
  list-style: none;
  margin-left: -20px;
  font-weight: 600;
}
#editor-message:empty {
  display: none;
}
#channel-fields .row input[type='color'] {
  width: 36px;
  height: 28px;
  padding: 0 2px;
}
.device-wrap {
  position: relative;
}
.menu {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  z-index: 10;
  min-width: 230px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
  padding: 6px 0;
  display: flex;
  flex-direction: column;
}
.menu button {
  border: 0;
  border-radius: 0;
  text-align: left;
  background: transparent;
  padding: 8px 14px;
}
.menu button:hover,
.menu button:focus {
  background: var(--code-bg);
  outline: none;
}
.danger-text {
  color: var(--bad);
}
#btn-connect.connected {
  background: var(--card);
  color: var(--ok);
  border-color: var(--ok);
}
.toast {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 20;
  max-width: 380px;
  background: var(--ink);
  color: var(--card);
  border-radius: 10px;
  padding: 12px 14px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast.bad {
  background: var(--bad);
  color: var(--on-bad);
}
.toast button {
  background: transparent;
  color: inherit;
  border-color: currentColor;
}
.toast button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
dialog {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  max-width: 480px;
  width: calc(100% - 32px);
  background: var(--card);
  color: var(--ink);
}
dialog::backdrop {
  background: rgba(0, 0, 0, 0.45);
}
dialog h2 {
  margin-top: 0;
}
.row.end {
  justify-content: flex-end;
  margin-top: 16px;
}
dialog progress {
  width: 100%;
  height: 10px;
}
.send-summary {
  margin: 8px 0;
  padding-left: 20px;
}

#unsupported {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}
#unsupported-text {
  flex: 1;
  min-width: 240px;
}
pre.commands {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px;
  font-size: 12px;
  white-space: pre-wrap;
  word-break: break-all;
  user-select: all;
}
#btn-connect.no-usb {
  background: transparent;
  color: var(--warn);
  border-color: var(--warn);
}
.welcome {
  padding: 8px 0;
}
.welcome h3 {
  margin-top: 0;
  color: inherit;
  font-size: 16px;
}
.choices {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 12px;
}
.choice {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: flex-start;
}
.choice .note {
  flex: 1;
}

/* Programs list and editor side by side on wide screens; stacked below. */
.lib-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px 24px;
}
@media (min-width: 1100px) {
  .lib-grid {
    grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
  }
  .lib-grid:has(#editor[hidden]) {
    grid-template-columns: 1fr;
  }
  .lib-main {
    border-left: 1px solid var(--line);
    padding-left: 24px;
  }
  .lib-grid:has(#editor[hidden]) .lib-main {
    display: none;
  }
  #editor-title {
    margin-top: 4px;
  }
  .lib-side .mode-item .actions {
    width: 100%;
    justify-content: flex-end;
  }
}
.row > label {
  max-width: 100%;
}