:root {
  color-scheme: dark;
  --bg: #1b1d22;
  --panel: #23262d;
  --panel-2: #2c3038;
  --border: #3a3f4a;
  --text: #e4e6eb;
  --muted: #959cab;
  --faint: #5f6673;
  --accent: #4f8cff;
  --wire: #8a93a3;
  --on: #39d98a;
  --error: #ff5c5c;
  --warn: #f2b84b;
  --run: #2fbf71;
  --prog: #4f8cff;
  --mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
  /* Height of the rung wire from the top of a series; every ladder symbol lines up on it. */
  --wire-y: 30px;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  display: flex;
  flex-direction: column;
  font: 14px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

h2 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 10px;
}

h3 {
  font-size: 13px;
  margin: 14px 0 8px;
}

/* -- controls -------------------------------------------------------------- */

button,
.button {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  font: inherit;
  cursor: pointer;
}

button:hover:not(:disabled),
.button:hover {
  border-color: var(--accent);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

button.danger {
  border-color: #7a3434;
  color: #ffb3b3;
  margin-top: 6px;
}

button.small {
  padding: 2px 8px;
  font-size: 12px;
}

button.link {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  text-decoration: underline;
}

.icon-button {
  padding: 4px 8px;
}

select,
input,
textarea {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 8px;
  font: inherit;
}

select:disabled,
input:disabled,
textarea:disabled {
  opacity: 0.6;
}

/* Greyed-out choices, e.g. I/O whose pin is already used by another address. */
option:disabled {
  color: var(--faint);
}

.muted {
  color: var(--muted);
}
.ok-text {
  color: var(--on);
}
.error-text {
  color: var(--error);
}
.warn-text {
  color: var(--warn);
}
.hidden {
  display: none !important;
}

/* -- toolbar, banner, status bar --------------------------------------------- */

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  padding: 8px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.toolbar h1 {
  font-size: 17px;
  margin: 0;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

#port-select {
  max-width: 260px;
}

.mode-switch {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.mode-switch button {
  border: none;
  border-radius: 0;
  padding: 6px 16px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.mode-switch button[data-mode="PROGRAM"].active {
  background: var(--prog);
  color: #fff;
  opacity: 1;
}

.mode-switch button[data-mode="RUN"].active {
  background: var(--run);
  color: #fff;
  opacity: 1;
}

.controller-state {
  margin-left: auto;
  font-size: 13px;
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
}
.controller-state.offline {
  color: var(--muted);
}
.controller-state.run {
  color: var(--run);
  border-color: var(--run);
}
.controller-state.prog {
  color: var(--prog);
  border-color: var(--prog);
}

.banner {
  padding: 6px 16px;
  font-size: 13px;
  border-bottom: 1px solid var(--border);
}
.banner.info {
  background: #22262e;
  color: var(--muted);
}
.banner.run {
  background: rgba(47, 191, 113, 0.12);
  color: #8fe3b6;
}
.banner.prog {
  background: rgba(79, 140, 255, 0.12);
  color: #a9c5ff;
}
.banner.error {
  background: rgba(255, 92, 92, 0.15);
  color: #ffb3b3;
}

.statusbar {
  display: flex;
  gap: 18px;
  padding: 5px 16px;
  font-size: 12px;
  background: var(--panel);
  border-top: 1px solid var(--border);
}

/* -- layout -------------------------------------------------------------------- */

.layout {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 210px 1fr 310px;
}

.palette,
.properties {
  background: var(--panel);
  padding: 12px;
  overflow-y: auto;
}

.palette {
  border-right: 1px solid var(--border);
}

.properties {
  border-left: 1px solid var(--border);
}

.workspace {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.tabs {
  display: flex;
  gap: 2px;
  padding: 8px 12px 0;
  border-bottom: 1px solid var(--border);
}

.tabs button {
  border-radius: 6px 6px 0 0;
  border-bottom: none;
  background: transparent;
  color: var(--muted);
}

.tabs button.active {
  background: var(--panel);
  color: var(--text);
}

.view {
  flex: 1;
  overflow: auto;
  padding: 14px;
}

/* -- palette --------------------------------------------------------------------- */

.palette-group h3 {
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 12px 0 6px;
}

.palette-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 5px 8px;
  margin-bottom: 4px;
  background: var(--panel-2);
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: grab;
  user-select: none;
}

.palette-item:hover {
  border-color: var(--accent);
}

.palette-item.disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.palette-item .mnemonic {
  min-width: 34px;
  font: 600 13px var(--mono);
  color: #7fc4ff;
}

.palette-item small {
  color: var(--muted);
  font-size: 11px;
}

/* -- ladder ------------------------------------------------------------------------ */

.rung {
  margin-bottom: 12px;
}

.rung-comment {
  margin: 0 0 2px 42px;
  color: #9fd29f;
  font-size: 12px;
  white-space: pre-wrap;
  cursor: pointer;
}

.rung-row {
  display: flex;
  gap: 8px;
}

.rung-num {
  flex: none;
  width: 34px;
  padding-top: calc(var(--wire-y) - 6px);
  text-align: right;
  font-family: var(--mono);
  color: var(--muted);
  cursor: pointer;
}

.rung-num.warning {
  color: var(--warn);
}

.rung-num.error {
  color: var(--error);
  font-weight: 700;
}

.rung.selected .rung-num {
  color: var(--accent);
  font-weight: 700;
}

/* Power rails on both sides. */
.rung-body {
  flex: 1;
  display: flex;
  min-width: max-content;
  padding: 4px 0 6px;
  border-left: 3px solid var(--wire);
  border-right: 3px solid var(--wire);
}

.rung.selected .rung-body {
  border-color: var(--accent);
}

/* A row of elements in series, with the wire drawn behind them. */
.series {
  display: flex;
  align-items: flex-start;
  flex: 1;
  min-height: 52px;
  background: linear-gradient(var(--wire), var(--wire)) 0 calc(var(--wire-y) - 1px) / 100% 2px no-repeat;
}

.series.main {
  padding: 0 6px;
}

.series.main.empty::after {
  content: "Drop instructions here";
  margin: calc(var(--wire-y) - 9px) 0 0 16px;
  padding: 0 6px;
  background: var(--bg);
  color: var(--faint);
  font-size: 12px;
}

.series.drag-over {
  outline: 1px dashed var(--accent);
  outline-offset: -1px;
}

.series.drop-end {
  box-shadow: inset -3px 0 0 var(--accent);
}

.el {
  position: relative;
  flex: none;
  margin: 0 6px;
  border-radius: 4px;
  cursor: pointer;
  user-select: none;
}

.el.drop-before {
  box-shadow: -5px 0 0 -2px var(--accent);
}

.el.dragging {
  opacity: 0.4;
}

.el.selected {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.el.error {
  background-color: rgba(255, 92, 92, 0.14);
}

.el.warning {
  background-color: rgba(242, 184, 75, 0.1);
}

/* Contacts and coils: tag name above the wire, symbol on it, alias below. */
.contact,
.coil {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 76px;
  color: var(--wire);
}

.tagname {
  max-width: 140px;
  height: 20px;
  line-height: 20px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font: 12px/20px var(--mono);
  color: var(--text);
}

.sym {
  width: 60px;
  height: 20px;
  background: var(--bg);
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  overflow: visible;
}

.sym text {
  fill: currentColor;
  stroke: none;
  font: 700 9px var(--mono);
  text-anchor: middle;
}

.alias {
  font: 10px var(--mono);
  color: var(--muted);
  white-space: nowrap;
}

.el.on {
  color: var(--on);
}

.el.on .tagname {
  color: var(--on);
}

.el.on .sym {
  filter: drop-shadow(0 0 3px rgba(57, 217, 138, 0.6));
}

/* Box instructions: the title row sits on the wire. */
.box {
  min-width: 160px;
  margin-top: calc(var(--wire-y) - 12px);
  margin-bottom: 4px;
  border: 2px solid var(--wire);
  background: var(--panel);
  font-size: 12px;
}

.box-title {
  height: 20px;
  padding: 0 8px;
  line-height: 20px;
  border-bottom: 1px solid var(--border);
  font: 700 12px/20px var(--mono);
  color: #7fc4ff;
}

.box-desc {
  padding: 2px 8px 0;
  color: var(--muted);
  font-size: 11px;
}

.box-row {
  display: flex;
  gap: 8px;
  padding: 1px 8px;
}

.box-row .lbl {
  min-width: 60px;
  color: var(--muted);
}

.box-row .op {
  flex: 1;
  font-family: var(--mono);
}

.box-row .val {
  font-family: var(--mono);
  color: var(--warn);
}

.box-bits {
  display: flex;
  gap: 4px;
  padding: 4px 8px 6px;
}

.bit {
  padding: 0 5px;
  border: 1px solid var(--border);
  border-radius: 3px;
  font: 600 10px/16px var(--mono);
  color: var(--muted);
}

.bit.on {
  background: var(--on);
  border-color: var(--on);
  color: #102018;
}

.box.on {
  border-color: var(--on);
}

.box.on .box-title {
  color: var(--on);
}

/* Branches: legs stacked vertically, joined by vertical wires on both sides. */
.branch {
  display: flex;
  flex-direction: column;
  border-radius: 0;
}

.branch.selected {
  outline-style: dashed;
}

.series.leg {
  position: relative;
  flex: none;
  padding: 0 12px 6px;
}

.series.leg.empty {
  min-width: 60px;
}

.leg::before,
.leg::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--wire);
}

.leg::before {
  left: 0;
}

.leg::after {
  right: 0;
}

.leg:first-child::before,
.leg:first-child::after {
  top: calc(var(--wire-y) - 1px);
}

.leg:last-child::before,
.leg:last-child::after {
  bottom: auto;
  height: calc(var(--wire-y) + 1px);
}

.leg:only-child::before,
.leg:only-child::after {
  display: none;
}

.add-rung {
  margin: 4px 0 0 42px;
}

/* -- properties ----------------------------------------------------------------- */

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
  font-size: 12px;
  color: var(--muted);
}

.field select,
.field input,
.field textarea {
  width: 100%;
  color: var(--text);
}

code.neutral {
  display: block;
  padding: 6px 8px;
  background: var(--bg);
  border-radius: 6px;
  font: 12px var(--mono);
  color: var(--text);
  word-break: break-all;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}

.diagnostics {
  list-style: none;
  margin: 8px 0;
  padding: 0;
}

.diagnostics li {
  margin-bottom: 4px;
  padding: 5px 8px;
  border-left: 3px solid var(--error);
  background: rgba(255, 92, 92, 0.08);
  font-size: 12px;
  cursor: pointer;
}

.diagnostics li.warning {
  border-color: var(--warn);
  background: rgba(242, 184, 75, 0.08);
}

.tips {
  padding-left: 18px;
  color: var(--muted);
  font-size: 12px;
}

.leg-list {
  margin: 10px 0;
}

.leg-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
}

.leg-item code {
  font: 12px var(--mono);
  word-break: break-all;
}

/* -- tag and I/O tables ------------------------------------------------------- */

.view-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 10px;
}

.view-header h2 {
  margin: 0;
}

.view-header p {
  margin: 0;
  font-size: 12px;
}

table.grid {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.grid th {
  position: sticky;
  top: -14px;
  padding: 6px 8px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.grid td {
  padding: 4px 8px;
  border-bottom: 1px solid #2a2e36;
}

.grid input[type="text"],
.grid input[type="number"],
.grid select {
  width: 100%;
}

.grid select.type-select {
  min-width: 112px;
}

.grid tr.error td:first-child input {
  border-color: var(--error);
}

/* I/O points whose pin is taken by another address. */
.grid tr.unavailable td {
  color: var(--faint);
}

.grid td.live {
  font-family: var(--mono);
  white-space: nowrap;
}

.grid td.live.on {
  color: var(--on);
}

.grid td.live .bit {
  margin-left: 3px;
}

.bool-toggle,
.dint-edit {
  min-width: 44px;
  padding: 2px 8px;
  font-family: var(--mono);
}

.bool-toggle.on {
  background: var(--on);
  border-color: var(--on);
  color: #102018;
}

/* -- buttons used across pages ------------------------------------------------- */

.button.disabled {
  opacity: 0.45;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

button.small.danger {
  margin-top: 0;
}

.small {
  font-size: 12px;
}

/* -- user menu ------------------------------------------------------------------ */

.user-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}

.user-menu img {
  width: 24px;
  height: 24px;
  border-radius: 50%;
}

/* -- empty state ------------------------------------------------------------------ */

.empty-state {
  max-width: 460px;
  margin: 80px auto;
  text-align: center;
  color: var(--muted);
}

/* -- devices dialog ------------------------------------------------------------- */

.dialog {
  width: min(860px, 94vw);
  max-height: 88vh;
  padding: 16px 20px;
  overflow-y: auto;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.dialog::backdrop {
  background: rgba(0, 0, 0, 0.55);
}

.dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.dialog .grid td.actions {
  display: flex;
  gap: 6px;
  white-space: nowrap;
}

.dialog .grid tr.current td {
  background: rgba(79, 140, 255, 0.08);
}

.add-device {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}

.add-device input {
  flex: 1;
}

.provisioning {
  margin-bottom: 16px;
  padding: 12px 14px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: rgba(79, 140, 255, 0.07);
}

.provisioning h3 {
  margin-top: 0;
}

.provisioning pre {
  margin: 6px 0;
  padding: 8px 10px;
  background: var(--bg);
  border-radius: 6px;
  font: 12px var(--mono);
  white-space: pre-wrap;
  word-break: break-all;
}

.token-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.token-row code {
  padding: 4px 8px;
  background: var(--bg);
  border-radius: 6px;
  font: 13px var(--mono);
  word-break: break-all;
}

/* -- sign-in and sign-up pages ---------------------------------------------------- */

body.auth-page {
  align-items: center;
  justify-content: center;
}

.auth-card {
  width: min(420px, 92vw);
  margin: auto;
  padding: 28px 30px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.auth-card.wide {
  width: min(680px, 94vw);
}

.auth-card h1 {
  margin: 0 0 6px;
  font-size: 22px;
}

.auth-card h2 {
  margin-top: 18px;
}

.github-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 22px 0 14px;
  padding: 10px 14px;
  background: #f0f2f5;
  color: #1b1d22;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
}

.github-button:hover {
  background: #fff;
}

.auth-error {
  padding: 8px 10px;
  background: rgba(255, 92, 92, 0.12);
  border-left: 3px solid var(--error);
  color: #ffb3b3;
  font-size: 13px;
}

.identity {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 10px 0 16px;
  color: var(--muted);
}

.identity img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
}

.checkbox {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 6px 0 12px;
  font-size: 13px;
}

.auth-page a {
  color: #8db4ff;
}