/* Makers Making Change brand theme.
     Verified against the official MMC logo (wrench-heart red #EE343F,
     navy #26225F) and Neil Squire brand guide (blue #0072ce). */
:root {
  --mmc-red: #ee343f; /* logo/mark accent — kept for non-text use */
  --mmc-red-dark: #be2a32; /* 5.89:1 on white — passes WCAG AA for --btn-text */
  --mmc-navy: #26225f;
  --mmc-blue: #0072ce;
  --bg: #f5f7f8;
  --panel: #ffffff;
  --accent: var(--mmc-red-dark);
  --accent2: var(--mmc-red-dark);
  --text: #3a3f42;
  --muted: #45525e;
  --danger: #b3261e;
  --border: #d7dde2;
  --field: #ffffff;
  --value-bg: #f0f3f5;
  --success: #1e7d46;
  --info: var(--mmc-blue);
  --warning: #c77700;
  --focus: #0072ce;
  --btn-text: #ffffff;
  --log-bg: #22272b;
  --log-text: #e8edf4;
  --log-tx: #6cb6ff;
  --log-rx: #4fc08d;
  --log-err: #ff8a80;
  --log-info: #9fb0c3;
}
/* A .light-mode class means the user explicitly picked light in-app, so the
   dark OS theme must not win. Gate every dark rule on its absence. */
@media (prefers-color-scheme: dark) {
  :root:not(.light-mode) {
    color-scheme: dark;
    --bg: #10151c;
    --panel: #1a2230;
    --accent: var(--mmc-red-dark);
    --accent2: #d63a42; /* 4.62:1 on white — passes WCAG AA for --btn-text */
    --text: #e8edf4;
    --muted: #93a1b5;
    --danger: #ff8a80;
    --border: #2c3a50;
    --field: #0d1117;
    --value-bg: #0d1117;
    --success: #4fc08d;
    --info: #6cb6ff;
    --warning: #ffb74d;
    --focus: #8ecbff;
    --log-bg: #0d1117;
  }
  :root:not(.light-mode) .unsupported {
    background: color-mix(in srgb, var(--danger) 16%, transparent);
    color: var(--danger);
  }
  :root:not(.light-mode)::-webkit-scrollbar {
    width: 8px;
  }
  :root:not(.light-mode)::-webkit-scrollbar-track {
    background: transparent;
  }
  :root:not(.light-mode)::-webkit-scrollbar-thumb {
    background: #3a4a60;
    border-radius: 4px;
  }
  :root:not(.light-mode)::-webkit-scrollbar-thumb:hover {
    background: #4a5a70;
  }
}
/* Forced light on a dark OS: restore UA-light form controls/scrollbars. */
html.light-mode {
  color-scheme: light;
}
html.dark-mode {
  color-scheme: dark;
  --bg: #10151c;
  --panel: #1a2230;
  --accent: var(--mmc-red-dark);
  --accent2: #d63a42; /* 4.62:1 on white — passes WCAG AA for --btn-text */
  --text: #e8edf4;
  --muted: #93a1b5;
  --danger: #ff8a80;
  --border: #2c3a50;
  --field: #0d1117;
  --value-bg: #0d1117;
  --success: #4fc08d;
  --info: #6cb6ff;
  --warning: #ffb74d;
  --focus: #8ecbff;
  --log-bg: #0d1117;
}
html.dark-mode .unsupported {
  background: color-mix(in srgb, var(--danger) 16%, transparent);
  color: var(--danger);
}
html.dark-mode ::-webkit-scrollbar {
  width: 8px;
}
html.dark-mode ::-webkit-scrollbar-track {
  background: transparent;
}
html.dark-mode ::-webkit-scrollbar-thumb {
  background: #3a4a60;
  border-radius: 4px;
}
html.dark-mode ::-webkit-scrollbar-thumb:hover {
  background: #4a5a70;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    'Segoe UI',
    Roboto,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.5;
}
a {
  color: var(--info);
}
header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 20px;
  background: color-mix(in srgb, var(--panel) 90%, transparent);
  border-bottom: 2px solid var(--accent);
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: box-shadow 0.2s ease;
}
header.scrolled {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}
@media (prefers-color-scheme: dark) {
  header.scrolled {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  }
}
html.dark-mode header.scrolled {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}
header h1 {
  font-size: 1.15rem;
  margin: 0;
}
header .logo {
  height: 36px;
  width: auto;
  border-radius: 6px;
  flex-shrink: 0;
  animation: logoFadeIn 0.6s ease;
}
header .logo.played {
  animation: none;
  opacity: 1;
}
header .logo:hover {
  opacity: 0.85;
}
@keyframes logoFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
header .status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 4px 12px 4px 8px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--value-bg);
  color: var(--muted);
  margin-left: auto;
}
.conn-banner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background: color-mix(in srgb, var(--danger) 14%, transparent);
  border-bottom: 1px solid var(--danger);
  color: var(--danger);
  font-size: 0.9rem;
  font-weight: 500;
}
.conn-banner[hidden] {
  display: none;
}
.conn-banner .conn-banner-msg {
  flex: 1;
}
.conn-banner button {
  flex-shrink: 0;
  min-height: 34px;
  padding: 6px 14px;
  font-size: 0.85rem;
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}
.conn-banner button:hover {
  background: color-mix(in srgb, var(--danger) 14%, transparent);
}
#btnConnBannerDismiss {
  min-width: 36px;
  padding: 6px 10px;
  font-size: 1.1rem;
  line-height: 1;
}
header .status::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
  flex-shrink: 0;
}
header .status.connected {
  background: color-mix(in srgb, var(--success) 12%, transparent);
  border-color: var(--success);
  color: var(--success);
}
header .status.connected::before {
  background: var(--success);
}
.header-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}
.header-actions button {
  padding: 8px 16px;
  font-size: 0.9rem;
  min-height: 40px;
}
main {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px;
  display: grid;
  gap: 0;
  scroll-margin-top: 72px;
}
.row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 12px 0;
  flex-wrap: wrap;
}
.row label {
  min-width: 200px;
  font-weight: 500;
}
.value {
  font-family: ui-monospace, 'Cascadia Mono', Consolas, monospace;
  font-variant-numeric: tabular-nums;
  min-width: 80px;
  text-align: center;
  background: var(--value-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 1rem;
}
.value.loading {
  color: var(--muted);
  animation: pulse 1.2s ease-in-out infinite;
}
.value.err {
  color: var(--danger);
}
@keyframes pulse {
  50% {
    opacity: 0.35;
  }
}
@media (prefers-reduced-motion: reduce) {
  .value.loading {
    animation: none;
    opacity: 0.6;
  }
}
button {
  background: var(--accent);
  color: var(--btn-text);
  font-weight: 600;
  border: 0;
  border-radius: 8px;
  padding: 12px 20px;
  font-size: 1rem;
  cursor: pointer;
  min-height: 48px;
  min-width: 48px;
  transition:
    background 0.15s ease,
    transform 0.1s ease;
  position: relative;
}
button:hover:not(:disabled) {
  background: var(--accent2);
}
button:active:not(:disabled) {
  transform: scale(0.98);
}
button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.btn--loading {
  color: transparent !important;
  pointer-events: none;
}
.btn--loading::after {
  content: '';
  position: absolute;
  inset: 0;
  margin: auto;
  width: 20px;
  height: 20px;
  border: 2.5px solid var(--btn-text);
  border-top-color: transparent;
  border-radius: 50%;
  animation: btnSpin 0.6s linear infinite;
}
.secondary.btn--loading::after {
  border-color: var(--text);
  border-top-color: transparent;
}
@keyframes btnSpin {
  to {
    transform: rotate(360deg);
  }
}
button.secondary {
  background: var(--value-bg);
  color: var(--text);
  border: 1px solid var(--border);
}
button.secondary:hover:not(:disabled) {
  background: var(--border);
  border-color: var(--muted);
}
button.danger {
  background: var(--danger);
  color: var(--btn-text);
}
:where(button, select, input, summary, a):focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}
input[type='number'],
select {
  width: 160px;
  padding: 10px 12px;
  background: var(--field);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  min-height: 48px;
}
#log {
  background: var(--log-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  height: 200px;
  overflow-y: auto;
  font-family: ui-monospace, monospace;
  font-size: 0.92rem;
  white-space: pre-wrap;
  color: var(--log-text);
  line-height: 1.6;
}
.log-tx {
  color: var(--log-tx);
}
.log-rx {
  color: var(--log-rx);
}
.log-err {
  color: var(--log-err);
}
.log-info {
  color: var(--log-info);
}
.unsupported {
  background: color-mix(in srgb, var(--danger) 12%, transparent);
  border: 1px solid var(--danger);
  border-radius: 8px;
  padding: 16px;
  margin: 20px;
  color: var(--danger);
}
.hint {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 8px;
  line-height: 1.5;
}
.spacer {
  height: 12px;
}
.row-hint {
  margin: 0;
}
.hub-remote {
  /* Stays on one line on wider views; .row's flex-wrap handles narrow ones. */
  flex-wrap: wrap;
  row-gap: 10px;
}
/* ---- Remote Hub mirrored screen ---- */
.hub-screen {
  background: var(--log-bg);
  color: var(--log-text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  max-width: 340px;
  font-family: ui-monospace, 'Cascadia Mono', Consolas, monospace;
}
.hub-screen-header {
  margin: 0 0 8px;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.hub-screen-header:empty {
  display: none;
}
.hub-screen-items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}
.hub-screen-items li {
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.95rem;
}
.hub-screen-items li::before {
  content: '  ';
  white-space: pre;
}
.hub-screen-items li.selected::before {
  content: '> ';
}
.hub-screen-items li.selected {
  background: color-mix(in srgb, var(--log-text) 18%, transparent);
  font-weight: 700;
}
.hub-screen-items li.current {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.hub-screen-note {
  margin: 8px 0 0;
  font-size: 0.85rem;
  color: var(--log-info);
}
.hub-screen-note[hidden] {
  display: none;
}
.progress {
  color: var(--info);
  font-size: 0.95rem;
  min-height: 1.2em;
}
#loadProgress {
  width: 100%;
}
#loadProgressLabel {
  font-size: 0.85rem;
  color: var(--muted);
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}
.notice {
  padding: 12px 16px;
  border-left: 3px solid var(--info);
  background: var(--value-bg);
  color: var(--muted);
  border-radius: 0 8px 8px 0;
}
/* An empty .notice has no border/background — used by the health-check details
   slot, which only renders text during and immediately after a run. */
.notice:empty {
  padding: 0;
  border: 0;
  background: transparent;
}
/* The health-check status line fades out after a clean pass instead of
   vanishing abruptly; cancelled by health.js if a new run starts. */
#healthDetails {
  transition: opacity 0.4s ease;
}
#healthDetails.fade-out {
  opacity: 0;
}
#loadProgressRow[hidden] {
  display: none;
}
#loadProgressRow.fade-out {
  opacity: 0;
  transition: opacity 0.5s ease;
}
.error {
  color: var(--danger);
  min-height: 1.2em;
}
details {
  margin-top: 14px;
}
summary {
  cursor: pointer;
  color: var(--info);
  font-weight: 600;
  font-size: 1rem;
  padding: 4px 0;
}
footer {
  max-width: 960px;
  margin: 28px auto 0;
  padding: 10px 20px 28px;
  text-align: center;
  border-top: 2px solid var(--accent);
}
footer p {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.6;
}
@media (max-width: 560px) {
  main {
    padding: 14px;
  }
  .row label {
    min-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
    backdrop-filter: none !important;
    will-change: auto !important;
  }
}

/* ---- feature visualizations ---- */
.viz-wrap {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  flex-wrap: wrap;
  margin-top: 10px;
}
.plot {
  position: relative;
  width: 260px;
  height: 260px;
  border-radius: 14px;
  border: 1px solid var(--border);
  flex: 0 0 auto;
  overflow: hidden;
  background:
    linear-gradient(var(--border) 1px, transparent 1px) 0 0 / 20% 20%,
    linear-gradient(90deg, var(--border) 1px, transparent 1px) 0 0 / 20% 20%,
    var(--value-bg);
}
.plot .axis-x {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: color-mix(in srgb, var(--info) 45%, transparent);
}
.plot .axis-y {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: color-mix(in srgb, var(--info) 45%, transparent);
}
.plot .ring {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  border: 1.5px dashed color-mix(in srgb, var(--info) 55%, transparent);
  border-radius: 50%;
}
.plot .dot {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition:
    left 0.25s ease,
    top 0.25s ease;
}
.plot .dot.raw {
  width: 18px;
  height: 18px;
  background: var(--info);
}
.plot .dot.neutral {
  background: var(--success);
}
.plot .dot.corner {
  background: transparent;
  border: 2px solid var(--muted);
}
.plot .dot.corner.pending {
  border-color: var(--accent);
  animation: pulse 1s ease-in-out infinite;
}
.plot .dot.corner.captured {
  background: var(--accent);
  border-color: var(--accent);
}
.plot .dot[hidden],
.plot .ring[hidden] {
  display: none;
}
.plot-legend {
  font-size: 0.9rem;
  color: var(--muted);
  display: grid;
  gap: 8px;
  align-content: start;
}
.plot-legend .chip {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: middle;
}
.chip--info {
  background: var(--info);
}
.chip--success {
  background: var(--success);
}
.chip--muted {
  background: transparent;
  border: 2px solid var(--muted);
  position: relative;
}
.chip--muted::after {
  content: '';
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--muted);
  opacity: 0.35;
}
.chip--accent {
  background: var(--accent);
}
.gauge {
  position: relative;
  height: 32px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--value-bg);
  overflow: hidden;
  margin: 12px 0 6px;
}
.gauge .fill {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 0;
  background: linear-gradient(90deg, color-mix(in srgb, var(--info) 55%, transparent), var(--info));
  transition:
    left 0.2s ease,
    width 0.2s ease;
}
.gauge .zero {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 3px;
  background: color-mix(in srgb, var(--text) 45%, transparent);
  border-radius: 2px;
}
.gauge .mark {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent);
}
.gauge-scale {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 10px;
}
.meter {
  display: inline-flex;
  gap: 5px;
}
.meter span {
  width: 16px;
  height: 24px;
  border-radius: 4px;
  background: var(--value-bg);
  border: 1px solid var(--border);
  transition: background 0.2s ease;
}
.meter span.on {
  background: linear-gradient(180deg, var(--info), var(--mmc-blue));
  border-color: transparent;
}

/* ---- Mobile & touch refinements ---- */
button,
select,
input,
summary {
  touch-action: manipulation;
}
.plot {
  width: min(300px, 100%);
  height: auto;
  aspect-ratio: 1 / 1;
}
@media (pointer: coarse) {
  button,
  input[type='number'],
  select {
    min-height: 52px;
  }
  summary {
    display: inline-block;
    padding: 12px 0;
  }
  #notification {
    bottom: 16px;
    right: 16px;
    left: 16px;
    max-width: none;
  }
  .floating-gear {
    width: 64px;
    height: 64px;
    bottom: 20px;
    right: 20px;
  }
  .floating-gear svg {
    width: 30px;
    height: 30px;
  }
  .appearance-popup {
    bottom: calc(64px + 20px + 12px);
    right: 20px;
  }
  .appearance-popup::after,
  .appearance-popup::before {
    right: 20px;
  }
}
@media (max-width: 700px) {
  header {
    padding: 8px 12px;
    gap: 6px;
  }
  header .logo {
    height: 28px;
  }
  header h1 {
    font-size: 1rem;
  }
  header .status {
    font-size: 0.8rem;
    padding: 3px 10px 3px 6px;
  }
  header .status::before {
    width: 6px;
    height: 6px;
  }
  .header-actions button {
    padding: 6px 12px;
    font-size: 0.85rem;
    min-height: 36px;
  }
  main {
    padding: 12px;
  }
  .row {
    gap: 10px;
  }
  .row label {
    min-width: 100%;
    margin-bottom: -2px;
  }
  input[type='number'],
  select {
    flex: 1 1 140px;
    width: auto;
  }
  .viz-wrap {
    gap: 14px;
  }
  .plot {
    margin: 0 auto;
  }
  .plot-legend {
    width: 100%;
  }
  #log {
    height: 160px;
  }
  .meter span {
    width: 12px;
    height: 20px;
  }
  footer {
    padding: 8px 16px 24px;
  }
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---- Toast notification ---- */
#notification {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px 12px 20px;
  border-radius: 12px;
  background: var(--danger);
  color: var(--btn-text);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.4;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.2);
  max-width: 420px;
}
#notification[hidden] {
  display: none;
}
#notification.warning {
  background: var(--info);
  color: #fff;
}
#notification .notif-msg {
  flex: 1;
}
#notification .notif-close {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.2);
  border: 0;
  border-radius: 8px;
  color: var(--btn-text);
  font-size: 1.2rem;
  cursor: pointer;
  min-height: unset;
  min-width: unset;
  transition: background 0.15s ease;
}
#notification .notif-close:hover {
  background: rgba(255, 255, 255, 0.35);
}
/* ---- Native dialog ---- */
dialog {
  padding: 28px 32px 20px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--panel);
  color: var(--text);
  max-width: 420px;
  width: 90vw;
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.18);
}
dialog::backdrop {
  background: rgba(0, 0, 0, 0.45);
}
@media (prefers-color-scheme: dark) {
  dialog::backdrop {
    background: rgba(0, 0, 0, 0.65);
  }
}
html.dark-mode dialog::backdrop {
  background: rgba(0, 0, 0, 0.65);
}
dialog[open] {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
dialog p {
  margin: 0;
  line-height: 1.5;
}
#confirmActions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 8px;
}
#confirmActions button {
  min-width: 100px;
  min-height: 44px;
  justify-content: center;
}
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 100;
  background: var(--panel);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 8px;
  border: 2px solid var(--focus);
  font-weight: 600;
  text-decoration: none;
}
.skip-link:focus {
  top: 8px;
}
main:focus {
  outline: none;
}
main:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: -3px;
}

/* ---- Connection guide overlay ---- */
#connectGuide {
  position: fixed;
  inset: 0;
  z-index: 250;
}
#connectGuide[hidden] {
  display: none;
}
.guide-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.guide-card {
  position: absolute;
  top: calc(56px + 10px);
  right: 24px;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.15);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  animation: guideFadeIn 0.2s ease;
}
@keyframes guideFadeIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.guide-card p {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 500;
  white-space: nowrap;
  line-height: 1.4;
}
.guide-card kbd {
  font-family: ui-monospace, monospace;
  background: var(--value-bg);
  padding: 2px 7px;
  border-radius: 5px;
  border: 1px solid var(--border);
  font-size: 0.88rem;
  font-weight: 600;
}
.guide-card button {
  flex-shrink: 0;
  min-height: 34px;
  padding: 6px 14px;
  font-size: 0.85rem;
}
@media (prefers-color-scheme: dark) {
  .guide-backdrop {
    background: rgba(0, 0, 0, 0.5);
  }
  .guide-card {
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.4);
  }
}
html.dark-mode .guide-backdrop {
  background: rgba(0, 0, 0, 0.5);
}
html.dark-mode .guide-card {
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.4);
}
@media (max-width: 700px) {
  .guide-card {
    top: calc(44px + 8px);
    right: 12px;
    padding: 12px 16px;
    gap: 10px;
  }
  .guide-card p {
    white-space: normal;
  }
}
@media (prefers-reduced-motion: reduce) {
  .guide-card {
    animation: none;
  }
}
/* ---- additions: live diagnostic pads ---- */
.diag-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 100px;
  min-height: 52px;
  padding: 10px 18px;
  border-radius: 10px;
  border: 2px solid var(--border);
  background: var(--value-bg);
  color: var(--muted);
  font-weight: 600;
  font-size: 0.95rem;
  transition:
    background 0.15s ease,
    color 0.15s ease,
    border-color 0.15s ease;
}
.diag-key.on {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--btn-text);
}
.plot .dot.out {
  background: var(--accent);
}

/* ---- Circle navigation (joystick/sip-puff accessible) ---- */
.circle-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  padding: 14px 20px 10px;
  flex-wrap: wrap;
}
.circle-trigger {
  width: 84px;
  height: 84px;
  border-radius: 18px;
  border: 2px solid var(--border);
  background: var(--panel);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  cursor: pointer;
  padding: 0;
  min-height: 84px;
  min-width: 84px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  gap: 3px;
  transition:
    background 0.15s ease,
    color 0.15s ease,
    border-color 0.15s ease;
}
.circle-trigger .circle-icon {
  font-size: 2rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.circle-trigger .circle-icon svg {
  width: 1em;
  height: 1em;
  display: block;
}
.circle-trigger .circle-label {
  font-size: 0.72rem;
  opacity: 0.8;
  white-space: nowrap;
  max-width: 80px;
  overflow: hidden;
  text-overflow: ellipsis;
}
.circle-trigger:hover {
  background: var(--value-bg);
  color: var(--text);
  border-color: var(--muted);
}
.circle-trigger.active {
  background: var(--accent);
  color: var(--btn-text);
  border-color: var(--accent);
}
.circle-trigger.active .circle-label {
  opacity: 1;
}

/* ---- Section cards (collapsible) ---- */
.section-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: clip;
  max-height: 0;
  opacity: 0;
  transition:
    max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1),
    opacity 0.25s ease;
  margin: 0;
}
.section-card + .section-card {
  margin-top: 0;
}
.section-card.open {
  opacity: 1;
  padding-bottom: 20px;
}
/* Serial-dependent cards are de-emphasized until a device connects */
.section-card.card-off.open {
  opacity: 0.55;
}
.circle-trigger.dimmed {
  opacity: 0.45;
  cursor: not-allowed;
}
.circle-trigger.dimmed:hover {
  background: var(--panel);
  color: var(--muted);
  border-color: var(--border);
  transform: none;
}

/* ---- Self-test live narration panel (LED / buzzer) ---- */
.selftest-panel {
  margin-top: 10px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--value-bg);
}
/* Groups the four diagnostic activities into visually distinct boxes. */
.diag-group {
  margin-top: 14px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--value-bg);
}
.diag-group .diag-title {
  margin: 0 0 10px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}
/* Inside a diag-group, direct children carry no extra outer margin. */
.diag-group > :not(.diag-title) {
  margin-left: 0;
  margin-right: 0;
}
.diag-group > .row:first-of-type {
  margin-top: 4px;
}
.diag-group > .spacer {
  display: none; /* replaced by the group border */
}
.selftest-title {
  margin: 0 0 10px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}
.selftest-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}
.selftest-steps li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--muted);
  padding: 4px 0;
  transition: opacity 0.2s ease;
}
.selftest-steps li::before {
  content: '';
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--border);
  flex-shrink: 0;
  transition: all 0.2s ease;
}
.selftest-steps li.done {
  color: var(--success);
}
.selftest-steps li.done::before {
  background: var(--success);
  border-color: var(--success);
}
.selftest-steps li.active {
  color: var(--text);
  font-weight: 600;
}
.selftest-steps li.active::before {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 20%, transparent);
}
.selftest-live {
  min-height: 1em;
}

/* ---- Health check per-subsystem cards ---- */
.health-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
  margin: 14px 0 4px;
}
/* display:grid above beats the UA's [hidden] { display:none } (author origin
   wins), so the hidden attribute alone never hid the grid — stale results
   stayed visible after a disconnect/reconnect. Honor it explicitly. */
.health-grid[hidden] {
  display: none;
}
.health-cell {
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--value-bg);
  font-size: 0.95rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
}
.health-cell[data-state='running'] {
  border-color: var(--info);
  color: var(--text);
}
.health-cell[data-state='ok'] {
  border-color: color-mix(in srgb, var(--success) 40%, transparent);
  color: var(--success);
}
.health-cell[data-state='warn'] {
  border-color: color-mix(in srgb, var(--warning, #c77700) 50%, transparent);
  color: var(--warning, #c77700);
}
.health-cell[data-state='err'] {
  border-color: var(--danger);
  color: var(--danger);
  background: color-mix(in srgb, var(--danger) 8%, transparent);
}

/* ---- Calibration step strip ---- */
.cal-steps {
  list-style: none;
  padding: 0;
  margin: 8px 0 14px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 6px;
}
/* The author display:grid above beats the UA's [hidden] { display: none }
   rule (author origin wins), so the strip was visible even while no
   calibration was running. Honor the attribute explicitly. */
.cal-steps[hidden] {
  display: none;
}
.cal-steps li {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 44px;
  padding: 6px 10px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--value-bg);
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  transition: all 0.2s ease;
}
.cal-steps li.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--btn-text);
}
.cal-steps li.done {
  background: color-mix(in srgb, var(--success) 15%, transparent);
  border-color: var(--success);
  color: var(--success);
}
.cal-steps li.pending {
  opacity: 0.55;
}
@media (max-width: 700px) {
  .cal-steps li {
    font-size: 0.72rem;
    padding: 6px 8px;
  }
}

/* ---- Connect stage (header indicator) ---- */
.connect-stage {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  padding: 4px 12px;
  border-radius: 14px;
  background: var(--value-bg);
  border: 1px solid var(--border);
  animation: stageIn 0.2s ease;
}
.connect-stage[data-stage='loading'] {
  color: var(--info);
  border-color: var(--info);
}
.connect-stage[data-stage='ready'] {
  color: var(--success);
  border-color: var(--success);
}
.connect-stage[data-stage='failed'] {
  color: var(--danger);
  border-color: var(--danger);
}
@keyframes stageIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .connect-stage,
  .selftest-steps li,
  .cal-steps li {
    transition: none;
    animation: none;
  }
}

.section-card h2 {
  margin: 20px 24px 16px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}
.section-card > *:not(h2):not(.hint) {
  margin: 12px 24px;
}
.section-card > .hint {
  margin: 8px 24px 12px;
}

/* ---- Responsive ---- */
@media (max-width: 700px) {
  .circle-nav {
    gap: 6px;
    padding: 10px 10px 6px;
  }
  .circle-trigger {
    width: 66px;
    height: 66px;
    min-height: 66px;
    min-width: 66px;
    border-radius: 14px;
  }
  .circle-trigger .circle-icon {
    font-size: 1.6rem;
  }
  .circle-trigger .circle-label {
    font-size: 0.67rem;
  }
}

/* ---- Toggle switch (used in popup) ---- */
.toggle {
  position: relative;
  width: 52px;
  height: 28px;
  border-radius: 14px;
  background: var(--border);
  cursor: pointer;
  min-width: 52px;
  min-height: 28px;
  padding: 0;
  border: none;
  transition: background 0.2s ease;
}
.toggle::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.2s ease;
}
.toggle:hover:not(:disabled) {
  background: var(--border);
}
.toggle[aria-pressed='true'] {
  background: var(--success);
}
.toggle[aria-pressed='true']:hover:not(:disabled) {
  background: var(--success);
}
.toggle[aria-pressed='true']::after {
  transform: translateX(24px);
}
.toggle-label {
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 600;
  min-width: 32px;
}

/* ---- Floating appearance button ---- */
.floating-gear {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 300;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: var(--btn-text);
  border: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
  cursor: pointer;
  min-width: unset;
  min-height: unset;
  transition:
    transform 0.2s ease,
    background 0.15s ease,
    box-shadow 0.2s ease;
}
.floating-gear svg {
  width: 26px;
  height: 26px;
  display: block;
}
.floating-gear:hover {
  background: var(--accent2);
  transform: scale(1.06);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25);
}
.floating-gear:active {
  transform: scale(0.96);
}
.floating-gear.active {
  background: var(--accent2);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}
html.dark-mode .floating-gear {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}
@media (max-width: 560px) {
  .floating-gear {
    bottom: 16px;
    right: 16px;
  }
}

/* ---- Appearance popup ---- */
.appearance-popup {
  position: fixed;
  z-index: 299;
  bottom: calc(56px + 24px + 12px);
  right: 24px;
  width: 280px;
  max-height: 70vh;
  overflow-y: auto;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  opacity: 0;
  visibility: hidden;
  transform-origin: bottom right;
  transform: translateY(8px) scale(0.95);
  transition:
    opacity 0.2s ease,
    transform 0.2s ease,
    visibility 0.2s ease;
}
.appearance-popup::after {
  content: '';
  position: absolute;
  top: 100%;
  right: 24px;
  width: 0;
  height: 0;
  border: 8px solid transparent;
  border-top-color: var(--border);
}
.appearance-popup::before {
  content: '';
  position: absolute;
  top: 100%;
  right: 24px;
  width: 0;
  height: 0;
  z-index: 1;
  border: 7px solid transparent;
  border-top-color: var(--panel);
  margin: 0 0 0 1px;
  transform: translateY(-2px);
}
.appearance-popup.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}
.popup-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.popup-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.popup-row span {
  font-weight: 500;
  font-size: 0.9rem;
  flex: 1;
}
.popup-colors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 16px;
}
.pc-row {
  display: flex;
  align-items: center;
  gap: 6px;
}
.pc-row label {
  font-size: 0.82rem;
  color: var(--muted);
  min-width: 44px;
}
.pc-row input[type='color'] {
  width: 36px;
  height: 28px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--field);
  cursor: pointer;
  min-height: 28px;
}
.pc-row input[type='color']::-webkit-color-swatch-wrapper {
  padding: 1px;
}
.pc-row input[type='color']::-webkit-color-swatch {
  border: none;
  border-radius: 4px;
}
.popup-reset {
  width: 100%;
  padding: 10px;
  font-size: 0.85rem;
  min-height: 40px;
}
html.dark-mode .appearance-popup {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}
@media (max-width: 560px) {
  .appearance-popup {
    right: 16px;
    width: 260px;
  }
  .appearance-popup::after,
  .appearance-popup::before {
    right: 16px;
  }
}