Alfred
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fm-rds-tx
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Go-based FM stereo transmitter with RDS, Windows-first and cross-platform
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fm-rds-tx/internal/control/ui.html

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  1. <!DOCTYPE html>

  2. <html lang="en">

  3. <head>

  4. <meta charset="utf-8">

  5. <meta name="viewport" content="width=device-width, initial-scale=1">

  6. <title>fm-rds-tx</title>

  7. <style>

  8. @import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600;700&family=Archivo+Black&display=swap');

  9. 

  10. :root {

  11.   --bg: #0a0a0c;

  12.   --bg-2: #0f1015;

  13.   --surface: #111116;

  14.   --surface2: #18181e;

  15.   --surface3: #1f2028;

  16.   --border: #2a2a35;

  17.   --border-strong: #3a3a49;

  18.   --text: #d4d4dc;

  19.   --text-dim: #8b8b99;

  20.   --text-muted: #666674;

  21.   --accent: #ff3b30;

  22.   --accent-glow: #ff3b3044;

  23.   --green: #30d158;

  24.   --green-glow: #30d15844;

  25.   --amber: #ff9f0a;

  26.   --amber-glow: #ff9f0a44;

  27.   --blue: #0a84ff;

  28.   --blue-glow: #0a84ff33;

  29.   --mono: 'JetBrains Mono', monospace;

  30.   --display: 'Archivo Black', sans-serif;

  31.   --radius: 8px;

  32.   --shadow: 0 10px 30px rgba(0,0,0,.25);

  33. }

  34. 

  35. * { box-sizing: border-box; margin: 0; padding: 0; }

  36. html { color-scheme: dark; }

  37. body {

  38.   background:

  39.     radial-gradient(circle at top right, rgba(10,132,255,.06), transparent 28%),

  40.     radial-gradient(circle at top left, rgba(255,59,48,.06), transparent 30%),

  41.     var(--bg);

  42.   color: var(--text);

  43.   font-family: var(--mono);

  44.   font-size: 13px;

  45.   line-height: 1.5;

  46.   min-height: 100vh;

  47.   overflow-x: hidden;

  48. }

  49. 

  50. body::before {

  51.   content: '';

  52.   position: fixed; inset: 0;

  53.   background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255,255,255,0.015) 2px, rgba(255,255,255,0.015) 4px);

  54.   pointer-events: none;

  55.   z-index: 1000;

  56. }

  57. 

  58. button, input { font: inherit; }

  59. button { user-select: none; }

  60. 

  61. .app {

  62.   max-width: 1120px;

  63.   margin: 0 auto;

  64.   padding: 18px;

  65. }

  66. 

  67. .header {

  68.   display: flex;

  69.   align-items: flex-start;

  70.   justify-content: space-between;

  71.   gap: 18px;

  72.   padding: 8px 0 22px;

  73.   border-bottom: 1px solid var(--border);

  74.   margin-bottom: 18px;

  75. }

  76. .header-main {

  77.   display: flex;

  78.   flex-direction: column;

  79.   gap: 8px;

  80. }

  81. .header h1 {

  82.   font-family: var(--display);

  83.   font-size: 24px;

  84.   letter-spacing: 2px;

  85.   text-transform: uppercase;

  86.   color: var(--accent);

  87.   text-shadow: 0 0 20px var(--accent-glow), 0 0 40px var(--accent-glow);

  88. }

  89. .header-sub {

  90.   display: flex;

  91.   flex-wrap: wrap;

  92.   gap: 8px;

  93. }

  94. .badge {

  95.   display: inline-flex;

  96.   align-items: center;

  97.   gap: 8px;

  98.   min-height: 28px;

  99.   padding: 0 10px;

  100.   border: 1px solid var(--border);

  101.   border-radius: 999px;

  102.   background: rgba(255,255,255,0.02);

  103.   color: var(--text-dim);

  104.   font-size: 11px;

  105.   text-transform: uppercase;

  106.   letter-spacing: .8px;

  107. }

  108. .badge strong {

  109.   color: var(--text);

  110.   font-weight: 700;

  111. }

  112. .header-status {

  113.   display: flex;

  114.   align-items: center;

  115.   gap: 10px;

  116.   padding-top: 6px;

  117. }

  118. 

  119. .led {

  120.   width: 10px;

  121.   height: 10px;

  122.   border-radius: 50%;

  123.   background: #333;

  124.   box-shadow: none;

  125.   transition: all .25s ease;

  126.   flex-shrink: 0;

  127. }

  128. .led.on-green {

  129.   background: var(--green);

  130.   box-shadow: 0 0 8px var(--green), 0 0 20px var(--green-glow);

  131. }

  132. .led.on-red {

  133.   background: var(--accent);

  134.   box-shadow: 0 0 8px var(--accent), 0 0 20px var(--accent-glow);

  135. }

  136. .led.on-amber {

  137.   background: var(--amber);

  138.   box-shadow: 0 0 8px var(--amber), 0 0 20px var(--amber-glow);

  139. }

  140. .led.on-blue {

  141.   background: var(--blue);

  142.   box-shadow: 0 0 8px var(--blue), 0 0 20px var(--blue-glow);

  143. }

  144. 

  145. .status-text {

  146.   font-size: 10px;

  147.   color: var(--text-dim);

  148.   text-transform: uppercase;

  149.   letter-spacing: 1.2px;

  150. }

  151. 

  152. .layout {

  153.   display: grid;

  154.   grid-template-columns: minmax(0, 1.35fr) minmax(310px, .75fr);

  155.   gap: 14px;

  156.   align-items: start;

  157. }

  158. .stack { display: flex; flex-direction: column; gap: 12px; }

  159. 

  160. .card {

  161.   background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));

  162.   border: 1px solid var(--border);

  163.   border-radius: var(--radius);

  164.   box-shadow: var(--shadow);

  165. }

  166. 

  167. .hero {

  168.   padding: 16px;

  169.   position: relative;

  170.   overflow: hidden;

  171. }

  172. .hero.tx-live::after {

  173.   content: '';

  174.   position: absolute;

  175.   inset: -40%;

  176.   background: radial-gradient(circle, rgba(48,209,88,.12), transparent 55%);

  177.   animation: pulseGlow 2.8s ease-in-out infinite;

  178.   pointer-events: none;

  179. }

  180. .hero.tx-busy::after {

  181.   content: '';

  182.   position: absolute;

  183.   inset: -50%;

  184.   background: conic-gradient(from 0deg, transparent, rgba(255,159,10,.12), transparent 45%);

  185.   animation: spinWash 2s linear infinite;

  186.   pointer-events: none;

  187. }

  188. @keyframes pulseGlow {

  189.   0%, 100% { transform: scale(.95); opacity: .45; }

  190.   50% { transform: scale(1.05); opacity: .8; }

  191. }

  192. @keyframes spinWash {

  193.   from { transform: rotate(0deg); }

  194.   to { transform: rotate(360deg); }

  195. }

  196. @keyframes blinkSoft {

  197.   0%, 100% { opacity: 1; }

  198.   50% { opacity: .55; }

  199. }

  200. 

  201. .tx-bar {

  202.   position: relative;

  203.   z-index: 1;

  204.   display: grid;

  205.   grid-template-columns: minmax(180px, 250px) 1fr auto;

  206.   gap: 14px;

  207.   align-items: center;

  208. }

  209. 

  210. .freq-display-wrap {

  211.   display: flex;

  212.   flex-direction: column;

  213.   gap: 6px;

  214. }

  215. .freq-display-label {

  216.   font-size: 10px;

  217.   text-transform: uppercase;

  218.   letter-spacing: 1.4px;

  219.   color: var(--text-dim);

  220. }

  221. .freq-display {

  222.   font-family: var(--display);

  223.   font-size: 38px;

  224.   color: var(--green);

  225.   text-shadow: 0 0 15px var(--green-glow);

  226.   letter-spacing: 1px;

  227.   line-height: 1;

  228. }

  229. .freq-display .unit {

  230.   font-family: var(--mono);

  231.   font-size: 14px;

  232.   color: var(--text-dim);

  233.   margin-left: 5px;

  234. }

  235. 

  236. .freq-note {

  237.   display: flex;

  238.   gap: 12px;

  239.   margin-top: 6px;

  240.   font-size: 11px;

  241.   color: var(--text-muted);

  242.   text-transform: uppercase;

  243.   letter-spacing: 1px;

  244. }

  245. .freq-note-item {

  246.   display: inline-flex;

  247.   align-items: center;

  248.   gap: 4px;

  249. }

  250. .freq-note.mismatch .freq-note-item {

  251.   color: var(--amber);

  252. }

  253. 

  254. .tx-actions {

  255.   display: flex;

  256.   flex-wrap: wrap;

  257.   gap: 10px;

  258. }

  259. 

  260. .tx-btn, .ghost-btn, .apply-btn, .preset-btn, .danger-btn {

  261.   min-height: 40px;

  262.   padding: 0 18px;

  263.   border-radius: var(--radius);

  264.   border: 1px solid var(--border);

  265.   background: var(--surface2);

  266.   color: var(--text);

  267.   cursor: pointer;

  268.   font-size: 12px;

  269.   font-weight: 700;

  270.   text-transform: uppercase;

  271.   letter-spacing: 1px;

  272.   transition: all .16s ease;

  273. }

  274. .tx-btn:hover, .ghost-btn:hover, .apply-btn:hover, .preset-btn:hover, .danger-btn:hover {

  275.   transform: translateY(-1px);

  276.   border-color: var(--border-strong);

  277. }

  278. .tx-btn:disabled, .ghost-btn:disabled, .apply-btn:disabled, .preset-btn:disabled, .danger-btn:disabled {

  279.   opacity: .45;

  280.   cursor: not-allowed;

  281.   transform: none;

  282. }

  283. .tx-btn.start { border-color: var(--green); color: var(--green); }

  284. .tx-btn.start:hover:not(:disabled) { background: rgba(48,209,88,.1); }

  285. .tx-btn.stop { border-color: var(--accent); color: var(--accent); }

  286. .tx-btn.stop:hover:not(:disabled) { background: rgba(255,59,48,.1); }

  287. .ghost-btn { color: var(--text-dim); }

  288. .danger-btn {

  289.   border-color: rgba(255,59,48,.45);

  290.   color: var(--accent);

  291.   background: rgba(255,59,48,.04);

  292. }

  293. .danger-btn:hover:not(:disabled) {

  294.   background: rgba(255,59,48,.12);

  295. }

  296. 

  297. .tx-state-wrap {

  298.   display: flex;

  299.   flex-direction: column;

  300.   align-items: flex-end;

  301.   gap: 6px;

  302. }

  303. .tx-state {

  304.   font-size: 11px;

  305.   text-transform: uppercase;

  306.   letter-spacing: 2px;

  307.   color: var(--text-dim);

  308. }

  309. .tx-state.running { color: var(--green); animation: blinkSoft 2s ease-in-out infinite; }

  310. .tx-state.idle, .tx-state.stopped { color: var(--text-dim); }

  311. .tx-state.starting, .tx-state.stopping, .tx-state.working { color: var(--amber); animation: blinkSoft 1.1s ease-in-out infinite; }

  312. .tx-state.error { color: var(--accent); }

  313. .status-hint {

  314.   font-size: 10px;

  315.   color: var(--text-muted);

  316.   text-align: right;

  317. }

  318. 

  319. .quick-grid {

  320.   position: relative;

  321.   z-index: 1;

  322.   display: grid;

  323.   grid-template-columns: repeat(5, minmax(0, 1fr));

  324.   gap: 10px;

  325.   margin-top: 16px;

  326. }

  327. .quick-item {

  328.   padding: 12px;

  329.   border: 1px solid var(--border);

  330.   border-radius: var(--radius);

  331.   background: var(--bg-2);

  332. }

  333. .quick-item .label {

  334.   font-size: 9px;

  335.   text-transform: uppercase;

  336.   letter-spacing: 1.4px;

  337.   color: var(--text-dim);

  338.   margin-bottom: 6px;

  339. }

  340. .quick-item .value {

  341.   font-size: 18px;

  342.   font-weight: 700;

  343.   color: var(--text);

  344. }

  345. .quick-item .value.warn { color: var(--amber); }

  346. .quick-item .value.err { color: var(--accent); }

  347. .quick-item .value.good { color: var(--green); }

  348. 

  349. .signal-grid {

  350.   position: relative;

  351.   z-index: 1;

  352.   display: grid;

  353.   grid-template-columns: repeat(3, minmax(0, 1fr));

  354.   gap: 10px;

  355.   margin-top: 12px;

  356. }

  357. .signal-card {

  358.   padding: 12px;

  359.   border: 1px solid var(--border);

  360.   border-radius: var(--radius);

  361.   background: var(--bg-2);

  362. }

  363. .signal-head {

  364.   display: flex;

  365.   align-items: center;

  366.   justify-content: space-between;

  367.   gap: 10px;

  368.   margin-bottom: 8px;

  369. }

  370. .signal-title {

  371.   font-size: 10px;

  372.   color: var(--text-dim);

  373.   text-transform: uppercase;

  374.   letter-spacing: 1.2px;

  375. }

  376. .signal-value {

  377.   font-size: 11px;

  378.   color: var(--text);

  379.   font-weight: 700;

  380. }

  381. .meter {

  382.   width: 100%;

  383.   height: 10px;

  384.   border-radius: 999px;

  385.   background: #171821;

  386.   border: 1px solid var(--border);

  387.   overflow: hidden;

  388. }

  389. .meter-fill {

  390.   height: 100%;

  391.   width: 0%;

  392.   transition: width .25s ease, background-color .25s ease;

  393.   background: linear-gradient(90deg, var(--green), #5cff90);

  394. }

  395. .meter-fill.warn {

  396.   background: linear-gradient(90deg, var(--amber), #ffc45b);

  397. }

  398. .meter-fill.err {

  399.   background: linear-gradient(90deg, var(--accent), #ff6b63);

  400. }

  401. .spark {

  402.   width: 100%;

  403.   height: 34px;

  404.   margin-top: 10px;

  405.   border-radius: 6px;

  406.   background: rgba(255,255,255,0.01);

  407.   border: 1px solid rgba(255,255,255,0.03);

  408. }

  409. .spark path.line {

  410.   fill: none;

  411.   stroke-width: 2;

  412.   stroke-linecap: round;

  413.   stroke-linejoin: round;

  414. }

  415. .spark path.area {

  416.   opacity: .14;

  417. }

  418. .spark.good path.line { stroke: var(--green); }

  419. .spark.good path.area { fill: var(--green); }

  420. .spark.warn path.line { stroke: var(--amber); }

  421. .spark.warn path.area { fill: var(--amber); }

  422. .spark.err path.line { stroke: var(--accent); }

  423. .spark.err path.area { fill: var(--accent); }

  424. 

  425. .panel {

  426.   overflow: hidden;

  427. }

  428. .panel-head {

  429.   display: flex;

  430.   align-items: center;

  431.   gap: 8px;

  432.   padding: 12px 14px;

  433.   border-bottom: 1px solid var(--border);

  434.   background: var(--surface2);

  435.   cursor: pointer;

  436.   user-select: none;

  437. }

  438. .panel-head h2 {

  439.   font-size: 11px;

  440.   font-weight: 700;

  441.   text-transform: uppercase;

  442.   letter-spacing: 1.6px;

  443.   color: var(--text-dim);

  444. }

  445. .panel-head .meta {

  446.   margin-left: auto;

  447.   margin-right: 8px;

  448.   font-size: 10px;

  449.   color: var(--text-muted);

  450.   text-transform: uppercase;

  451.   letter-spacing: 1px;

  452. }

  453. .panel-head .chevron {

  454.   color: var(--text-dim);

  455.   transition: transform .2s ease;

  456.   font-size: 10px;

  457. }

  458. .panel-head.collapsed .chevron { transform: rotate(-90deg); }

  459. .panel-body { padding: 14px; }

  460. .panel-body.collapsed { display: none; }

  461. 

  462. .section-note {

  463.   font-size: 11px;

  464.   color: var(--text-muted);

  465.   margin-bottom: 12px;

  466. }

  467. .shortcuts-grid {

  468.   display: grid;

  469.   grid-template-columns: repeat(2, minmax(0, 1fr));

  470.   gap: 8px 12px;

  471. }

  472. .shortcut-line {

  473.   display: flex;

  474.   align-items: center;

  475.   justify-content: space-between;

  476.   gap: 12px;

  477.   padding: 7px 0;

  478.   border-bottom: 1px solid #1a1a22;

  479. }

  480. .shortcut-line:last-child { border-bottom: none; }

  481. .shortcut-line .name { font-size: 11px; color: var(--text-dim); }

  482. .shortcut-line .keys {

  483.   display: inline-flex;

  484.   gap: 6px;

  485.   flex-wrap: wrap;

  486. }

  487. .kbd {

  488.   min-width: 28px;

  489.   padding: 3px 7px;

  490.   border: 1px solid var(--border);

  491.   border-bottom-width: 2px;

  492.   border-radius: 6px;

  493.   background: var(--bg-2);

  494.   font-size: 10px;

  495.   color: var(--text);

  496.   text-align: center;

  497. }

  498. 

  499. .preset-row {

  500.   display: flex;

  501.   flex-wrap: wrap;

  502.   gap: 8px;

  503.   margin-bottom: 12px;

  504. }

  505. .preset-btn {

  506.   min-height: 34px;

  507.   padding: 0 12px;

  508.   font-size: 11px;

  509.   letter-spacing: .8px;

  510.   color: var(--text-dim);

  511. }

  512. .preset-btn.active {

  513.   border-color: var(--blue);

  514.   color: var(--blue);

  515.   background: rgba(10,132,255,.08);

  516. }

  517. .preset-btn.rds {

  518.   text-transform: none;

  519.   font-weight: 600;

  520. }

  521. 

  522. .ctrl-row {

  523.   display: flex;

  524.   align-items: center;

  525.   gap: 12px;

  526.   padding: 10px 0;

  527.   border-bottom: 1px solid #1a1a22;

  528. }

  529. .ctrl-row:last-child { border-bottom: none; }

  530. .ctrl-label-wrap {

  531.   min-width: 130px;

  532.   display: flex;

  533.   flex-direction: column;

  534.   gap: 2px;

  535. }

  536. .ctrl-label {

  537.   font-size: 11px;

  538.   color: var(--text-dim);

  539.   text-transform: uppercase;

  540.   letter-spacing: .8px;

  541. }

  542. .ctrl-sub {

  543.   font-size: 10px;

  544.   color: var(--text-muted);

  545. }

  546. .ctrl-input {

  547.   flex: 1;

  548.   display: flex;

  549.   align-items: center;

  550.   gap: 10px;

  551. }

  552. 

  553. input[type="range"] {

  554.   -webkit-appearance: none;

  555.   appearance: none;

  556.   flex: 1;

  557.   height: 6px;

  558.   background: linear-gradient(90deg, var(--border), var(--surface3));

  559.   border-radius: 999px;

  560.   outline: none;

  561. }

  562. input[type="range"]::-webkit-slider-thumb {

  563.   -webkit-appearance: none;

  564.   width: 16px;

  565.   height: 16px;

  566.   border-radius: 50%;

  567.   background: var(--text);

  568.   border: 2px solid var(--bg);

  569.   cursor: pointer;

  570.   transition: background .15s ease, transform .15s ease;

  571. }

  572. input[type="range"]::-webkit-slider-thumb:hover {

  573.   background: var(--accent);

  574.   transform: scale(1.06);

  575. }

  576. input[type="number"], input[type="text"] {

  577.   background: var(--bg);

  578.   border: 1px solid var(--border);

  579.   border-radius: 6px;

  580.   color: var(--text);

  581.   padding: 8px 10px;

  582.   outline: none;

  583.   transition: border-color .15s ease, box-shadow .15s ease, background-color .15s ease;

  584. }

  585. input[type="number"] {

  586.   width: 92px;

  587.   text-align: right;

  588. }

  589. input[type="text"] { width: 100%; }

  590. input:focus {

  591.   border-color: var(--accent);

  592.   box-shadow: 0 0 0 3px rgba(255,59,48,.12);

  593. }

  594. input.input-dirty {

  595.   border-color: var(--amber);

  596.   box-shadow: 0 0 0 3px rgba(255,159,10,.08);

  597. }

  598. input.input-error {

  599.   border-color: var(--accent);

  600.   box-shadow: 0 0 0 3px rgba(255,59,48,.14);

  601.   background: rgba(255,59,48,.04);

  602. }

  603. .val-display {

  604.   min-width: 64px;

  605.   text-align: right;

  606.   font-size: 12px;

  607.   font-weight: 700;

  608.   color: var(--text);

  609. }

  610. .unit-label {

  611.   font-size: 11px;

  612.   color: var(--text-dim);

  613.   min-width: 44px;

  614. }

  615. .field-error {

  616.   display: none;

  617.   margin-top: 8px;

  618.   font-size: 11px;

  619.   color: var(--accent);

  620. }

  621. .field-error.show { display: block; }

  622. 

  623. .toggle-row {

  624.   display: flex;

  625.   align-items: center;

  626.   justify-content: space-between;

  627.   gap: 14px;

  628.   padding: 12px 0;

  629.   border-bottom: 1px solid #1a1a22;

  630. }

  631. .toggle-row:last-child { border-bottom: none; }

  632. .toggle-copy {

  633.   display: flex;

  634.   flex-direction: column;

  635.   gap: 3px;

  636. }

  637. .toggle-copy .title {

  638.   font-size: 12px;

  639.   color: var(--text);

  640.   font-weight: 700;

  641. }

  642. .toggle-copy .sub {

  643.   font-size: 10px;

  644.   color: var(--text-muted);

  645. }

  646. .toggle-ctl {

  647.   display: flex;

  648.   align-items: center;

  649.   gap: 10px;

  650. }

  651. .toggle {

  652.   position: relative;

  653.   width: 42px;

  654.   height: 24px;

  655.   background: var(--border);

  656.   border-radius: 999px;

  657.   cursor: pointer;

  658.   transition: all .2s ease;

  659.   flex-shrink: 0;

  660. }

  661. .toggle::after {

  662.   content: '';

  663.   position: absolute;

  664.   top: 3px;

  665.   left: 3px;

  666.   width: 18px;

  667.   height: 18px;

  668.   background: var(--text);

  669.   border-radius: 50%;

  670.   transition: transform .2s ease;

  671. }

  672. .toggle.on { background: var(--green); }

  673. .toggle.on::after { transform: translateX(18px); }

  674. .toggle.busy { opacity: .55; pointer-events: none; }

  675. .toggle-state {

  676.   min-width: 52px;

  677.   text-align: right;

  678.   font-size: 11px;

  679.   color: var(--text-dim);

  680.   text-transform: uppercase;

  681.   letter-spacing: 1px;

  682. }

  683. 

  684. .rds-grid {

  685.   display: grid;

  686.   gap: 12px;

  687. }

  688. .rds-field {

  689.   display: flex;

  690.   flex-direction: column;

  691.   gap: 6px;

  692. }

  693. .rds-input {

  694.   width: 100%;

  695.   background: var(--bg);

  696.   border: 1px solid var(--border);

  697.   border-radius: 6px;

  698.   color: var(--green);

  699.   font-family: var(--mono);

  700.   font-size: 15px;

  701.   font-weight: 700;

  702.   padding: 10px 12px;

  703.   outline: none;

  704.   letter-spacing: 2px;

  705.   text-transform: uppercase;

  706. }

  707. .rds-input.rt {

  708.   color: var(--text);

  709.   text-transform: none;

  710.   letter-spacing: .5px;

  711.   font-size: 12px;

  712.   font-weight: 500;

  713. }

  714. .rds-charcount {

  715.   font-size: 10px;

  716.   color: var(--text-dim);

  717.   text-align: right;

  718. }

  719. 

  720. .actions-row {

  721.   display: flex;

  722.   gap: 10px;

  723.   flex-wrap: wrap;

  724.   margin-top: 14px;

  725. }

  726. .apply-btn {

  727.   background: var(--accent);

  728.   border-color: transparent;

  729.   color: #fff;

  730. }

  731. .apply-btn.secondary {

  732.   background: var(--surface2);

  733.   color: var(--text-dim);

  734.   border-color: var(--border);

  735. }

  736. .apply-btn.ok { background: var(--green); color: var(--bg); }

  737. 

  738. .sidebar-card {

  739.   padding: 14px;

  740. }

  741. .sidebar-section + .sidebar-section {

  742.   margin-top: 14px;

  743.   padding-top: 14px;

  744.   border-top: 1px solid var(--border);

  745. }

  746. .sidebar-title {

  747.   font-size: 11px;

  748.   text-transform: uppercase;

  749.   letter-spacing: 1.4px;

  750.   color: var(--text-dim);

  751.   margin-bottom: 10px;

  752. }

  753. .kv {

  754.   display: grid;

  755.   grid-template-columns: auto 1fr;

  756.   gap: 8px 12px;

  757.   align-items: start;

  758. }

  759. .kv .k {

  760.   font-size: 10px;

  761.   color: var(--text-muted);

  762.   text-transform: uppercase;

  763.   letter-spacing: 1px;

  764. }

  765. .kv .v {

  766.   font-size: 12px;

  767.   color: var(--text);

  768.   word-break: break-word;

  769. }

  770. .health-line {

  771.   display: flex;

  772.   align-items: center;

  773.   justify-content: space-between;

  774.   gap: 10px;

  775.   padding: 8px 0;

  776.   border-bottom: 1px solid #1a1a22;

  777. }

  778. .health-line:last-child { border-bottom: none; }

  779. .health-line .name {

  780.   font-size: 11px;

  781.   color: var(--text-dim);

  782. }

  783. .health-line .val {

  784.   font-size: 11px;

  785.   color: var(--text);

  786.   text-align: right;

  787. }

  788. .health-line .val.good { color: var(--green); }

  789. .health-line .val.warn { color: var(--amber); }

  790. .health-line .val.err { color: var(--accent); }

  791. .health-trend {

  792.   margin-top: 10px;

  793. }

  794. .health-trend-label {

  795.   font-size: 10px;

  796.   text-transform: uppercase;

  797.   letter-spacing: 1px;

  798.   color: var(--text-muted);

  799.   margin-bottom: 6px;

  800. }

  801. 

  802. .fault-history {

  803.   margin-top: 12px;

  804.   padding: 10px;

  805.   border: 1px solid var(--border);

  806.   border-radius: 6px;

  807.   background: var(--surface1);

  808.   font-size: 11px;

  809.   max-height: 180px;

  810.   overflow-y: auto;

  811.   line-height: 1.3;

  812. }

  813. .fault-history-entry {

  814.   display: flex;

  815.   justify-content: space-between;

  816.   gap: 10px;

  817.   padding: 4px 0;

  818.   border-bottom: 1px solid rgba(255, 255, 255, 0.08);

  819. }

  820. .fault-history-entry:last-child {

  821.   border-bottom: none;

  822. }

  823. .fault-history-entry .fault-history-time {

  824.   color: var(--text-dim);

  825. }

  826. .fault-history-entry.ok { color: var(--green); }

  827. .fault-history-entry.warn { color: var(--amber); }

  828. .fault-history-entry.err { color: var(--accent); }

  829. .fault-history-desc {

  830.   font-size: 10px;

  831.   flex: 1;

  832.   text-transform: uppercase;

  833.   letter-spacing: 0.5px;

  834. }

  835. .fault-history-empty {

  836.   padding: 6px 0;

  837.   color: var(--text-muted);

  838.   font-size: 11px;

  839. }

  840. .transition-history {

  841.   margin-top: 12px;

  842.   padding: 10px;

  843.   border: 1px solid var(--border);

  844.   border-radius: 6px;

  845.   background: var(--surface);

  846.   font-size: 11px;

  847.   max-height: 180px;

  848.   overflow-y: auto;

  849.   line-height: 1.3;

  850. }

  851. .transition-history-entry {

  852.   display: flex;

  853.   justify-content: space-between;

  854.   gap: 10px;

  855.   padding: 4px 0;

  856.   border-bottom: 1px solid rgba(255, 255, 255, 0.08);

  857. }

  858. .transition-history-entry:last-child {

  859.   border-bottom: none;

  860. }

  861. .transition-history-entry .transition-history-time {

  862.   color: var(--text-dim);

  863. }

  864. .transition-history-entry.good { color: var(--green); }

  865. .transition-history-entry.warn { color: var(--amber); }

  866. .transition-history-entry.err { color: var(--accent); }

  867. .transition-history-entry.info { color: var(--text); }

  868. .transition-history-desc {

  869.   font-size: 10px;

  870.   flex: 1;

  871.   text-transform: uppercase;

  872.   letter-spacing: 0.5px;

  873. }

  874. .transition-history-empty {

  875.   padding: 6px 0;

  876.   color: var(--text-muted);

  877.   font-size: 11px;

  878. }

  879. .section-note.reset-hint {

  880.   font-size: 11px;

  881.   color: var(--text-dim);

  882.   margin-top: 10px;

  883. }

  884. 

  885. .log {

  886.   background: var(--bg);

  887.   border: 1px solid var(--border);

  888.   border-radius: 6px;

  889.   padding: 10px;

  890.   font-size: 10px;

  891.   color: var(--text-dim);

  892.   max-height: 220px;

  893.   overflow-y: auto;

  894.   white-space: pre-wrap;

  895.   word-break: break-word;

  896. }

  897. .log .entry { padding: 3px 0; }

  898. .log .entry.err { color: var(--accent); }

  899. .log .entry.ok { color: var(--green); }

  900. .log .entry.warn { color: var(--amber); }

  901. .log .entry.info { color: var(--blue); }

  902. .empty-log {

  903.   color: var(--text-muted);

  904. }

  905. 

  906. .toast {

  907.   position: fixed;

  908.   right: 16px;

  909.   bottom: 16px;

  910.   max-width: min(420px, calc(100vw - 24px));

  911.   padding: 12px 15px;

  912.   border-radius: var(--radius);

  913.   font-size: 12px;

  914.   font-weight: 700;

  915.   z-index: 2000;

  916.   transform: translateY(60px);

  917.   opacity: 0;

  918.   transition: all .25s ease;

  919.   box-shadow: var(--shadow);

  920. }

  921. .toast.show { transform: translateY(0); opacity: 1; }

  922. .toast.ok { background: var(--green); color: var(--bg); }

  923. .toast.err { background: var(--accent); color: #fff; }

  924. .toast.info { background: var(--blue); color: #fff; }

  925. .toast.warn { background: var(--amber); color: #141414; }

  926. 

  927. @media (max-width: 980px) {

  928.   .layout { grid-template-columns: 1fr; }

  929.   .tx-bar {

  930.     grid-template-columns: 1fr;

  931.     align-items: stretch;

  932.   }

  933.   .tx-state-wrap {

  934.     align-items: flex-start;

  935.   }

  936.   .status-hint { text-align: left; }

  937.   .quick-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  938.   .signal-grid { grid-template-columns: 1fr; }

  939. }

  940. 

  941. @media (max-width: 640px) {

  942.   .app { padding: 12px; }

  943.   .header { flex-direction: column; align-items: stretch; gap: 10px; }

  944.   .header h1 { font-size: 22px; }

  945.   .header-sub { gap: 6px; }

  946.   .badge { width: 100%; justify-content: space-between; }

  947.   .quick-grid { grid-template-columns: 1fr 1fr; gap: 8px; }

  948.   .quick-item { padding: 10px; }

  949.   .quick-item .value { font-size: 16px; }

  950.   .ctrl-row { flex-direction: column; align-items: stretch; }

  951.   .ctrl-label-wrap { min-width: auto; }

  952.   .ctrl-input { flex-wrap: wrap; }

  953.   input[type="number"] { width: 100%; text-align: left; }

  954.   .actions-row, .tx-actions { flex-direction: column; }

  955.   .tx-btn, .ghost-btn, .apply-btn, .preset-btn, .danger-btn { width: 100%; }

  956.   .panel-head { padding: 11px 12px; }

  957.   .panel-body, .sidebar-card { padding: 12px; }

  958.   .freq-display { font-size: 31px; }

  959.   .preset-row { flex-direction: column; }

  960.   .shortcuts-grid { grid-template-columns: 1fr; }

  961. }

  962. </style>

  963. </head>

  964. <body>

  965. <div class="app">

  966.   <div class="header">

  967.     <div class="header-main">

  968.       <h1>FM-RDS-TX</h1>

  969.       <div class="header-sub">

  970.         <div class="badge"><span>Backend</span><strong id="badge-backend">--</strong></div>

  971.         <div class="badge"><span>Mode</span><strong id="badge-mode">Control Plane</strong></div>

  972.         <div class="badge"><span>Live Config</span><strong id="badge-live">--</strong></div>

  973.       </div>

  974.     </div>

  975.     <div class="header-status">

  976.       <div class="led" id="led-conn"></div>

  977.       <div class="status-text" id="conn-label">connecting</div>

  978.     </div>

  979.   </div>

  980. 

  981.   <div class="layout">

  982.     <div class="stack">

  983.       <div class="card hero" id="hero-card">

  984.         <div class="tx-bar">

  985.           <div class="freq-display-wrap">

  986.             <div class="freq-display-label">Carrier</div>

  987.             <div class="freq-display" id="freq-display">---.-<span class="unit">MHz</span></div>

  988.             <div class="freq-note" id="freq-note">

  989.               <span class="freq-note-item" id="freq-applied">Applied: --</span>

  990.               <span class="freq-note-item" id="freq-desired">Desired: --</span>

  991.             </div>

  992.           </div>

  993. 

  994.           <div class="tx-actions">

  995.             <button class="tx-btn start" id="btn-start" type="button">TX ON</button>

  996.             <button class="tx-btn stop" id="btn-stop" type="button">TX OFF</button>

  997.             <button class="ghost-btn" id="btn-refresh" type="button">Refresh</button>

  998.           </div>

  999. 

  1000.           <div class="tx-state-wrap">

  1001.             <div class="tx-state idle" id="tx-state">IDLE</div>

  1002.             <div class="status-hint" id="tx-hint">Awaiting runtime data</div>

  1003.           </div>

  1004.         </div>

  1005. 

  1006.         <div class="quick-grid">

  1007.           <div class="quick-item">

  1008.             <div class="label">Chunks</div>

  1009.             <div class="value" id="t-chunks">--</div>

  1010.           </div>

  1011.           <div class="quick-item">

  1012.             <div class="label">Samples</div>

  1013.             <div class="value" id="t-samples">--</div>

  1014.           </div>

  1015.           <div class="quick-item">

  1016.             <div class="label">Underruns</div>

  1017.             <div class="value" id="t-underruns">--</div>

  1018.           </div>

  1019.           <div class="quick-item">

  1020.             <div class="label">Uptime</div>

  1021.             <div class="value" id="t-uptime">--</div>

  1022.           </div>

  1023.           <div class="quick-item">

  1024.             <div class="label">Rate</div>

  1025.             <div class="value" id="t-rate">--</div>

  1026.           </div>

  1027.         </div>

  1028. 

  1029.         <div class="signal-grid">

  1030.           <div class="signal-card">

  1031.             <div class="signal-head">

  1032.               <div class="signal-title">Audio Buffer</div>

  1033.               <div class="signal-value" id="meter-audio-text">--</div>

  1034.             </div>

  1035.             <div class="meter"><div class="meter-fill" id="meter-audio-fill"></div></div>

  1036.             <svg class="spark good" id="spark-audio" viewBox="0 0 160 34" preserveAspectRatio="none"></svg>

  1037.           </div>

  1038.           <div class="signal-card">

  1039.             <div class="signal-head">

  1040.               <div class="signal-title">Stream Health</div>

  1041.               <div class="signal-value" id="meter-stream-text">--</div>

  1042.             </div>

  1043.             <div class="meter"><div class="meter-fill" id="meter-stream-fill"></div></div>

  1044.             <svg class="spark warn" id="spark-underruns" viewBox="0 0 160 34" preserveAspectRatio="none"></svg>

  1045.           </div>

  1046.           <div class="signal-card">

  1047.             <div class="signal-head">

  1048.               <div class="signal-title">TX Activity</div>

  1049.               <div class="signal-value" id="meter-tx-text">--</div>

  1050.             </div>

  1051.             <div class="meter"><div class="meter-fill" id="meter-tx-fill"></div></div>

  1052.             <svg class="spark good" id="spark-tx" viewBox="0 0 160 34" preserveAspectRatio="none"></svg>

  1053.           </div>

  1054.         </div>

  1055.       </div>

  1056. 

  1057.       <div class="card panel" data-panel-key="frequency">

  1058.         <div class="panel-head" data-panel>

  1059.           <div class="led on-green" style="width:6px;height:6px"></div>

  1060.           <h2>Frequency</h2>

  1061.           <div class="meta" id="freq-meta">Live-tunable</div>

  1062.           <span class="chevron">▼</span>

  1063.         </div>

  1064.         <div class="panel-body">

  1065.           <div class="section-note">Tune the RF carrier without restarting the control plane. Draft values stay local until you apply them.</div>

  1066. 

  1067.           <div class="preset-row" id="freq-presets">

  1068.             <button class="preset-btn" type="button" data-freq-preset="87.6">87.6 MHz</button>

  1069.             <button class="preset-btn" type="button" data-freq-preset="94.5">94.5 MHz</button>

  1070.             <button class="preset-btn" type="button" data-freq-preset="99.5">99.5 MHz</button>

  1071.             <button class="preset-btn" type="button" data-freq-preset="100.0">100.0 MHz</button>

  1072.             <button class="preset-btn" type="button" data-freq-preset="107.9">107.9 MHz</button>

  1073.           </div>

  1074. 

  1075.           <div class="ctrl-row">

  1076.             <div class="ctrl-label-wrap">

  1077.               <span class="ctrl-label">TX Freq</span>

  1078.               <span class="ctrl-sub">Valid range 65–110 MHz</span>

  1079.             </div>

  1080.             <div class="ctrl-input">

  1081.               <input type="range" min="65" max="110" step="0.1" id="freq-slider">

  1082.               <input type="number" min="65" max="110" step="0.1" id="freq-num">

  1083.               <span class="unit-label">MHz</span>

  1084.             </div>

  1085.           </div>

  1086.           <div class="field-error" id="freq-error"></div>

  1087.           <div class="actions-row">

  1088.             <button class="apply-btn" id="freq-apply" type="button">Apply Frequency</button>

  1089.             <button class="apply-btn secondary" id="freq-reset" type="button">Reset</button>

  1090.           </div>

  1091.         </div>

  1092.       </div>

  1093. 

  1094.       <div class="card panel" data-panel-key="switches">

  1095.         <div class="panel-head" data-panel>

  1096.           <div class="led on-green" style="width:6px;height:6px"></div>

  1097.           <h2>Switches</h2>

  1098.           <div class="meta">Live</div>

  1099.           <span class="chevron">▼</span>

  1100.         </div>

  1101.         <div class="panel-body">

  1102.           <div class="section-note">These switches apply immediately and show a busy state while the request is in flight.</div>

  1103. 

  1104.           <div class="toggle-row">

  1105.             <div class="toggle-copy">

  1106.               <div class="title">Stereo</div>

  1107.               <div class="sub">19 kHz pilot + 38 kHz DSB-SC</div>

  1108.             </div>

  1109.             <div class="toggle-ctl">

  1110.               <div class="toggle" id="tog-stereo" data-toggle="stereoEnabled" role="switch" aria-checked="false" tabindex="0"></div>

  1111.               <div class="toggle-state" id="stereo-label">--</div>

  1112.             </div>

  1113.           </div>

  1114. 

  1115.           <div class="toggle-row">

  1116.             <div class="toggle-copy">

  1117.               <div class="title">RDS</div>

  1118.               <div class="sub">57 kHz subcarrier encoder</div>

  1119.             </div>

  1120.             <div class="toggle-ctl">

  1121.               <div class="toggle" id="tog-rds" data-toggle="rdsEnabled" role="switch" aria-checked="false" tabindex="0"></div>

  1122.               <div class="toggle-state" id="rds-label">--</div>

  1123.             </div>

  1124.           </div>

  1125. 

  1126.           <div class="toggle-row">

  1127.             <div class="toggle-copy">

  1128.               <div class="title">Limiter</div>

  1129.               <div class="sub">MPX peak protection</div>

  1130.             </div>

  1131.             <div class="toggle-ctl">

  1132.               <div class="toggle" id="tog-limiter" data-toggle="limiterEnabled" role="switch" aria-checked="false" tabindex="0"></div>

  1133.               <div class="toggle-state" id="limiter-label">--</div>

  1134.             </div>

  1135.           </div>

  1136.         </div>

  1137.       </div>

  1138. 

  1139.       <div class="card panel" data-panel-key="rds">

  1140.         <div class="panel-head" data-panel>

  1141.           <div class="led on-amber" style="width:6px;height:6px"></div>

  1142.           <h2>RDS Text</h2>

  1143.           <div class="meta" id="rds-meta">PS + RT</div>

  1144.           <span class="chevron">▼</span>

  1145.         </div>

  1146.         <div class="panel-body">

  1147.           <div class="section-note">Edit Program Service and RadioText without losing in-progress typing when the page refreshes itself.</div>

  1148. 

  1149.           <div class="preset-row" id="rds-presets">

  1150.             <button class="preset-btn rds" type="button" data-rds-ps="FMRTX" data-rds-rt="fm-rds-tx live">Station ID</button>

  1151.             <button class="preset-btn rds" type="button" data-rds-ps="ONAIR" data-rds-rt="Now broadcasting">On Air</button>

  1152.             <button class="preset-btn rds" type="button" data-rds-ps="LIVE" data-rds-rt="Live set in progress">Live Set</button>

  1153.             <button class="preset-btn rds" type="button" data-rds-ps="TEST" data-rds-rt="RDS test transmission">Test</button>

  1154.           </div>

  1155. 

  1156.           <div class="rds-grid">

  1157.             <div class="rds-field">

  1158.               <span class="ctrl-label">Program Service (PS)</span>

  1159.               <input type="text" class="rds-input" id="rds-ps" maxlength="8" placeholder="STATION" spellcheck="false">

  1160.               <div class="rds-charcount"><span id="ps-count">0</span>/8</div>

  1161.               <div class="field-error" id="ps-error"></div>

  1162.             </div>

  1163.             <div class="rds-field">

  1164.               <span class="ctrl-label">RadioText (RT)</span>

  1165.               <input type="text" class="rds-input rt" id="rds-rt" maxlength="64" placeholder="Now playing..." spellcheck="false">

  1166.               <div class="rds-charcount"><span id="rt-count">0</span>/64</div>

  1167.               <div class="field-error" id="rt-error"></div>

  1168.             </div>

  1169.           </div>

  1170.           <div class="actions-row">

  1171.             <button class="apply-btn" id="rds-apply" type="button">Apply RDS Text</button>

  1172.             <button class="apply-btn secondary" id="rds-reset" type="button">Reset</button>

  1173.           </div>

  1174.         </div>

  1175.       </div>

  1176.     </div>

  1177. 

  1178.     <div class="stack">

  1179.       <div class="card sidebar-card">

  1180.         <div class="sidebar-section">

  1181.           <div class="sidebar-title">System Snapshot</div>

  1182.           <div class="kv">

  1183.             <div class="k">Backend</div><div class="v" id="info-backend">--</div>

  1184.             <div class="k">Frequency</div><div class="v" id="info-freq">--</div>

  1185.             <div class="k">Pre-emphasis</div><div class="v" id="info-preemph">--</div>

  1186.             <div class="k">FM Mod</div><div class="v" id="info-fmmod">--</div>

  1187.             <div class="k">Live Config</div><div class="v" id="info-live">--</div>

  1188.           </div>

  1189.         </div>

  1190. 

  1191.         <div class="sidebar-section">

  1192.           <div class="sidebar-title">Health</div>

  1193.           <div class="health-line"><div class="name">HTTP</div><div class="val" id="health-http">--</div></div>

  1194.           <div class="health-line"><div class="name">Runtime</div><div class="val" id="health-runtime">--</div></div>

  1195.           <div class="health-line"><div class="name">State Age</div><div class="val" id="health-state-age">--</div></div>

  1196.           <div class="health-line"><div class="name">Runtime Signal</div><div class="val" id="health-indicator">--</div></div>

  1197.           <div class="health-line"><div class="name">Runtime Alert</div><div class="val" id="health-alert">--</div></div>

  1198.           <div class="health-line"><div class="name">Transitions (D/M/F)</div><div class="val" id="health-transitions">--</div></div>

  1199.           <div class="health-line"><div class="name">Fault Count</div><div class="val" id="health-fault-count">--</div></div>

  1200.           <div class="health-line"><div class="name">Last Fault</div><div class="val" id="health-last-fault">--</div></div>

  1201.           <div class="health-line"><div class="name">Audio Buffer</div><div class="val" id="health-audio">--</div></div>

  1202.           <div class="health-line"><div class="name">Buffer Duration</div><div class="val" id="health-buffer-duration">--</div></div>

  1203.           <div class="health-line"><div class="name">High Watermark</div><div class="val" id="health-buffer-highwater">--</div></div>

  1204.           <div class="health-line"><div class="name">Queue Fill</div><div class="val" id="health-queue-fill">--</div></div>

  1205.           <div class="health-line"><div class="name">Underrun Streak</div><div class="val" id="health-underrun-streak">--</div></div>

  1206.           <div class="health-line"><div class="name">Last Update</div><div class="val" id="health-last">--</div></div>

  1207.           <div class="health-trend">

  1208.             <div class="health-trend-label">High Watermark Trend</div>

  1209.             <svg class="spark warn" id="spark-high-watermark" viewBox="0 0 160 34" preserveAspectRatio="none"></svg>

  1210.           </div>

  1211.           <div class="health-trend">

  1212.             <div class="health-trend-label">Queue Fill Trend</div>

  1213.             <svg class="spark good" id="spark-queue-fill" viewBox="0 0 160 34" preserveAspectRatio="none"></svg>

  1214.           </div>

  1215.         </div>

  1216.       </div>

  1217. 

  1218. 

  1219.         <div class="sidebar-section">

  1220.           <div class="sidebar-title">Control Audit</div>

  1221.           <div class="section-note">Counts of 4xx rejects recorded by the control plane APIs.</div>

  1222.           <div class="kv">

  1223.             <div class="k">Rejects total</div><div class="v" id="audit-total">--</div>

  1224.             <div class="k">405 Method Not Allowed</div><div class="v" id="audit-methodNotAllowed">--</div>

  1225.             <div class="k">415 Unsupported Media Type</div><div class="v" id="audit-unsupportedMediaType">--</div>

  1226.             <div class="k">413 Request Too Large</div><div class="v" id="audit-bodyTooLarge">--</div>

  1227.             <div class="k">400 Unexpected Body</div><div class="v" id="audit-unexpectedBody">--</div>

  1228.           </div>

  1229.         </div>

  1230. 

  1231.       <div class="card panel" data-panel-key="shortcuts">

  1232.         <div class="panel-head" data-panel>

  1233.           <h2>Shortcuts</h2>

  1234.           <div class="meta">keyboard</div>

  1235.           <span class="chevron">▼</span>

  1236.         </div>

  1237.         <div class="panel-body">

  1238.           <div class="section-note">Fast control, as long as you're not typing in an input field.</div>

  1239.           <div class="shortcuts-grid">

  1240.             <div>

  1241.               <div class="shortcut-line"><span class="name">Start TX</span><span class="keys"><span class="kbd">t</span></span></div>

  1242.               <div class="shortcut-line"><span class="name">Stop TX</span><span class="keys"><span class="kbd">Shift</span><span class="kbd">t</span></span></div>

  1243.               <div class="shortcut-line"><span class="name">Refresh</span><span class="keys"><span class="kbd">r</span></span></div>

  1244.             </div>

  1245.             <div>

  1246.               <div class="shortcut-line"><span class="name">Next Freq Preset</span><span class="keys"><span class="kbd">]</span></span></div>

  1247.               <div class="shortcut-line"><span class="name">Prev Freq Preset</span><span class="keys"><span class="kbd">[</span></span></div>

  1248.               <div class="shortcut-line"><span class="name">Apply Draft</span><span class="keys"><span class="kbd">Enter</span></span></div>

  1249.             </div>

  1250.           </div>

  1251.         </div>

  1252.       </div>

  1253. 

  1254.       <div class="card panel" data-panel-key="danger">

  1255.         <div class="panel-head" data-panel>

  1256.           <h2>Danger Zone</h2>

  1257.           <div class="meta">tx control</div>

  1258.           <span class="chevron">▼</span>

  1259.         </div>

  1260.         <div class="panel-body">

  1261.           <div class="section-note">Fast emergency controls. Nothing hidden here — just clearer separation from normal controls.</div>

  1262.           <div class="actions-row" style="margin-top:0">

  1263.             <button class="danger-btn" id="danger-stop" type="button">Emergency Stop TX</button>

  1264.             <button class="danger-btn" id="danger-refresh" type="button">Hard Refresh Runtime</button>

  1265.             <button class="danger-btn secondary" id="danger-reset-fault" type="button">Reset Fault</button>

  1266. 

  1267.           </div>

  1268.           <div class="section-note reset-hint" id="reset-hint">

  1269.             Reset Fault moves the runtime back to DEGRADED while the queue settles before running again.

  1270.           </div>

  1271.         </div>

  1272.       </div>

  1273. 

  1274.       <div class="card panel" data-panel-key="transition-history">

  1275.         <div class="panel-head" data-panel>

  1276.           <h2>Transition History</h2>

  1277.           <div class="meta">recent state shifts</div>

  1278.           <span class="chevron"></span>

  1279.         </div>

  1280.         <div class="panel-body">

  1281.           <div class="section-note">Keeps runtime escalations visible without scrolling the activity log.</div>

  1282.           <div class="transition-history" id="transition-history">

  1283.             <div class="transition-history-empty">No transitions yet.</div>

  1284.           </div>

  1285.         </div>

  1286.       </div>

  1287. 

  1288.       <div class="card panel" data-panel-key="fault-history">

  1289.         <div class="panel-head" data-panel>

  1290.           <h2>Fault History</h2>

  1291.           <div class="meta">recent faults</div>

  1292.           <span class="chevron">▼</span>

  1293.         </div>

  1294.         <div class="panel-body">

  1295.           <div class="section-note">Recent fault events for quick ops situational awareness.</div>

  1296.           <div class="fault-history" id="fault-history">

  1297.             <div class="fault-history-empty">No faults yet.</div>

  1298.           </div>

  1299.         </div>

  1300.       </div>

  1301. 

  1302.       <div class="card panel" data-panel-key="log">

  1303.         <div class="panel-head" data-panel>

  1304.           <h2>Activity Log</h2>

  1305.           <div class="meta" id="log-meta">recent events</div>

  1306.           <span class="chevron">▼</span>

  1307.         </div>

  1308.         <div class="panel-body">

  1309.           <div class="actions-row" style="margin-top:0;margin-bottom:12px">

  1310.             <button class="ghost-btn" id="btn-clear-log" type="button">Clear Log</button>

  1311.           </div>

  1312.           <div class="log" id="log"><div class="empty-log">No events yet.</div></div>

  1313.         </div>

  1314.       </div>

  1315.     </div>

  1316.   </div>

  1317. </div>

  1318. 

  1319. <div class="toast" id="toast"></div>

  1320. 

  1321. <script>

  1322. const $ = (id) => document.getElementById(id);

  1323. 

  1324. const runtimePollMs = 1000;

  1325. const configPollMs = 8000;

  1326. const mobileMq = window.matchMedia('(max-width: 640px)');

  1327. const freqPresetValues = [87.6, 94.5, 99.5, 100.0, 107.9];

  1328. const sparkHistoryLimit = 40;

  1329. const transitionHistoryLimit = 6;

  1330. 

  1331. const state = {

  1332.   server: {

  1333.     config: null,

  1334.     runtime: null,

  1335.     lastConfigAt: 0,

  1336.     lastRuntimeAt: 0,

  1337.     configOk: false,

  1338.     runtimeOk: false,

  1339.   },

  1340.   lastRuntimeState: '',

  1341.   draft: {

  1342.     frequencyMHz: undefined,

  1343.     ps: undefined,

  1344.     radioText: undefined,

  1345.   },

  1346.   errors: {

  1347.     frequencyMHz: '',

  1348.     ps: '',

  1349.     radioText: '',

  1350.   },

  1351.   dirty: new Set(),

  1352.   pendingRequests: 0,

  1353.   txBusy: false,

  1354.   faultResetBusy: false,

  1355.   toggleBusy: {},

  1356.   pollersStarted: false,

  1357.   mobilePanelsApplied: false,

  1358.   charts: {

  1359.     audio: [],

  1360.     underruns: [],

  1361.     tx: [],

  1362.     highWatermark: [],

  1363.     queueFill: [],

  1364.   },

  1365.   runtimeTransitions: [],

  1366.   freqPresetIndex: 0,

  1367. };

  1368. 

  1369. const fields = {

  1370.   frequencyMHz: { section: 'freq', equal: (a,b) => nearlyEqual(a,b,0.0001) },

  1371.   ps: { section: 'rds', equal: (a,b) => String(a ?? '') === String(b ?? '') },

  1372.   radioText: { section: 'rds', equal: (a,b) => String(a ?? '') === String(b ?? '') },

  1373. };

  1374. 

  1375. function nearlyEqual(a, b, eps = 1e-9) {

  1376.   if (a == null && b == null) return true;

  1377.   if (a == null || b == null) return false;

  1378.   return Math.abs(Number(a) - Number(b)) <= eps;

  1379. }

  1380. 

  1381. function nowTs() { return Date.now(); }

  1382. 

  1383. function serverValue(key) {

  1384.   const cfg = state.server.config;

  1385.   if (!cfg) return undefined;

  1386.   switch (key) {

  1387.     case 'frequencyMHz': return cfg.fm?.frequencyMHz;

  1388.     case 'ps': return cfg.rds?.ps ?? '';

  1389.     case 'radioText': return cfg.rds?.radioText ?? '';

  1390.     case 'stereoEnabled': return cfg.fm?.stereoEnabled;

  1391.     case 'rdsEnabled': return cfg.rds?.enabled;

  1392.     case 'limiterEnabled': return cfg.fm?.limiterEnabled;

  1393.     default: return undefined;

  1394.   }

  1395. }

  1396. 

  1397. function effectiveValue(key) {

  1398.   return state.dirty.has(key) ? state.draft[key] : serverValue(key);

  1399. }

  1400. 

  1401. function validateField(key, value) {

  1402.   switch (key) {

  1403.     case 'frequencyMHz': {

  1404.       if (value == null || Number.isNaN(Number(value))) return 'Enter a valid number.';

  1405.       const num = Number(value);

  1406.       if (num < 65 || num > 110) return 'Frequency must stay between 65 and 110 MHz.';

  1407.       return '';

  1408.     }

  1409.     case 'ps': {

  1410.       const text = String(value ?? '');

  1411.       if (text.length > 8) return 'PS is limited to 8 characters.';

  1412.       return '';

  1413.     }

  1414.     case 'radioText': {

  1415.       const text = String(value ?? '');

  1416.       if (text.length > 64) return 'RadioText is limited to 64 characters.';

  1417.       return '';

  1418.     }

  1419.     default:

  1420.       return '';

  1421.   }

  1422. }

  1423. 

  1424. function sectionHasErrors(section) {

  1425.   return Object.entries(fields).some(([key, meta]) => meta.section === section && state.errors[key]);

  1426. }

  1427. 

  1428. function setDirty(key, value) {

  1429.   state.draft[key] = value;

  1430.   state.errors[key] = validateField(key, value);

  1431.   const current = serverValue(key);

  1432.   const equal = !state.errors[key] && fields[key].equal(value, current);

  1433.   if (equal) {

  1434.     state.dirty.delete(key);

  1435.     state.draft[key] = undefined;

  1436.   } else {

  1437.     state.dirty.add(key);

  1438.   }

  1439.   if (key === 'frequencyMHz' && typeof value === 'number') syncFreqPresetIndex(value);

  1440.   render();

  1441. }

  1442. 

  1443. function clearDirty(keys) {

  1444.   for (const key of keys) {

  1445.     state.dirty.delete(key);

  1446.     state.draft[key] = undefined;

  1447.     state.errors[key] = '';

  1448.   }

  1449.   render();

  1450. }

  1451. 

  1452. function isDirtySection(section) {

  1453.   for (const key of state.dirty) {

  1454.     if (fields[key]?.section === section) return true;

  1455.   }

  1456.   return false;

  1457. }

  1458. 

  1459. function getSectionPatch(section) {

  1460.   const patch = {};

  1461.   for (const key of state.dirty) {

  1462.     if (fields[key]?.section === section && !state.errors[key]) patch[key] = state.draft[key];

  1463.   }

  1464.   return patch;

  1465. }

  1466. 

  1467. async function api(path, opts) {

  1468.   const response = await fetch(path, opts);

  1469.   const text = await response.text();

  1470.   if (!response.ok) {

  1471.     throw new Error(text.trim() || `HTTP ${response.status}`);

  1472.   }

  1473.   if (!text) return {};

  1474.   try {

  1475.     return JSON.parse(text);

  1476.   } catch {

  1477.     return { ok: true, raw: text };

  1478.   }

  1479. }

  1480. 

  1481. function setConnection(ok, mode) {

  1482.   const led = $('led-conn');

  1483.   const label = $('conn-label');

  1484.   if (ok) {

  1485.     led.className = 'led on-green';

  1486.     label.textContent = mode || 'connected';

  1487.   } else {

  1488.     led.className = 'led on-red';

  1489.     label.textContent = mode || 'offline';

  1490.   }

  1491. }

  1492. 

  1493. async function loadConfig({ silent = false } = {}) {

  1494.   try {

  1495.     const cfg = await api('/config');

  1496.     state.server.config = cfg;

  1497.     state.server.configOk = true;

  1498.     state.server.lastConfigAt = nowTs();

  1499.     syncFreqPresetIndex(cfg.fm?.frequencyMHz);

  1500.     setConnection(true, state.pendingRequests > 0 ? 'busy' : 'connected');

  1501.     render();

  1502.     if (!silent) log('Config synced from server', 'info');

  1503.     return cfg;

  1504.   } catch (error) {

  1505.     state.server.configOk = false;

  1506.     if (!state.server.runtimeOk) setConnection(false, 'offline');

  1507.     render();

  1508.     if (!silent) log('Config load failed: ' + error.message, 'err');

  1509.     throw error;

  1510.   }

  1511. }

  1512. 

  1513. async function loadRuntime({ silent = true } = {}) {

  1514.   try {

  1515.     const runtime = await api('/runtime');

  1516.     state.server.runtime = runtime;

  1517.     state.server.runtimeOk = true;

  1518.     state.server.lastRuntimeAt = nowTs();

  1519.     const syncedTransitions = syncTransitionHistoryFromEngine(runtime.engine);

  1520.     notifyRuntimeTransition(runtime.engine, !syncedTransitions);

  1521.     pushHistory(runtime);

  1522.     setConnection(true, state.pendingRequests > 0 ? 'busy' : 'connected');

  1523.     render();

  1524.     return runtime;

  1525.   } catch (error) {

  1526.     state.server.runtimeOk = false;

  1527.     if (!state.server.configOk) setConnection(false, 'offline');

  1528.     render();

  1529.     if (!silent) log('Runtime load failed: ' + error.message, 'err');

  1530.     throw error;

  1531.   }

  1532. }

  1533. 

  1534. function pushHistory(runtime) {

  1535.   const engine = runtime.engine || {};

  1536.   const driver = runtime.driver || {};

  1537.   const audio = runtime.audioStream || {};

  1538.   pushChart(state.charts.audio, typeof audio.buffered === 'number' ? audio.buffered : 0);

  1539.   const highWatermarkDurationSeconds = Number(audio.highWatermarkDurationSeconds);

  1540.   const normalizedHighWatermark = Number.isFinite(highWatermarkDurationSeconds) ? highWatermarkDurationSeconds : 0;

  1541.   pushChart(state.charts.highWatermark, normalizedHighWatermark);

  1542.   const queueFill = Number(engine.queue?.fillLevel ?? 0);

  1543.   pushChart(state.charts.queueFill, Number.isFinite(queueFill) ? queueFill : 0);

  1544.   pushChart(state.charts.underruns, Number(engine.underruns ?? driver.underruns ?? 0));

  1545.   const txState = String(engine.state || 'idle').toLowerCase();

  1546.   pushChart(state.charts.tx, txState === 'running' ? 1 : state.txBusy ? 0.55 : 0.05);

  1547. }

  1548. 

  1549. function pushTransitionHistory(from, to, severity) {

  1550.   if (!from || !to) return;

  1551.   const entry = {

  1552.     from: normalizeRuntimeState(from),

  1553.     to: normalizeRuntimeState(to),

  1554.     severity: severity || 'info',

  1555.     time: nowTs(),

  1556.   };

  1557.   state.runtimeTransitions.unshift(entry);

  1558.   if (state.runtimeTransitions.length > transitionHistoryLimit) {

  1559.     state.runtimeTransitions.splice(transitionHistoryLimit);

  1560.   }

  1561.   updateTransitionHistory();

  1562. }

  1563. 

  1564. function transitionEntryTime(value) {

  1565.   if (value == null) return nowTs();

  1566.   if (typeof value === 'number') return value;

  1567.   const parsed = Date.parse(String(value));

  1568.   return Number.isNaN(parsed) ? nowTs() : parsed;

  1569. }

  1570. 

  1571. function syncTransitionHistoryFromEngine(engine) {

  1572.   const entries = Array.isArray(engine?.transitionHistory) ? engine.transitionHistory : null;

  1573.   if (!entries) return false;

  1574.   const sliceStart = Math.max(0, entries.length - transitionHistoryLimit);

  1575.   const trimmed = entries.slice(sliceStart);

  1576.   const normalized = trimmed.map((entry) => ({

  1577.     from: normalizeRuntimeState(entry?.from),

  1578.     to: normalizeRuntimeState(entry?.to),

  1579.     severity: String(entry?.severity || 'info').toLowerCase(),

  1580.     time: transitionEntryTime(entry?.time),

  1581.   }));

  1582.   normalized.reverse();

  1583.   state.runtimeTransitions = normalized;

  1584.   updateTransitionHistory();

  1585.   return true;

  1586. }

  1587. 

  1588. function transitionSeverityClass(severity) {

  1589.   switch (String(severity || '').toLowerCase()) {

  1590.     case 'err':

  1591.       return 'err';

  1592.     case 'warn':

  1593.       return 'warn';

  1594.     case 'ok':

  1595.     case 'good':

  1596.       return 'good';

  1597.     default:

  1598.       return 'info';

  1599.   }

  1600. }

  1601. 

  1602. function updateTransitionHistory() {

  1603.   const container = $('transition-history');

  1604.   if (!container) return;

  1605.   if (!state.runtimeTransitions.length) {

  1606.     container.innerHTML = '<div class="transition-history-empty">No transitions yet.</div>';

  1607.     return;

  1608.   }

  1609.   const rows = state.runtimeTransitions.map((entry) => {

  1610.     const when = entry?.time ? new Date(entry.time) : null;

  1611.     const timeLabel = when && !Number.isNaN(when.getTime()) ? when.toLocaleTimeString() : '--:--';

  1612.     const desc = `${entry.from.toUpperCase()} → ${entry.to.toUpperCase()}`;

  1613.     const severityClass = transitionSeverityClass(entry.severity);

  1614.     return `<div class="transition-history-entry ${severityClass}"><span class="transition-history-time">${timeLabel}</span><span class="transition-history-desc">${desc}</span></div>`;

  1615.   });

  1616.   container.innerHTML = rows.join('');

  1617. }

  1618. 

  1619. function pushChart(arr, value) {

  1620.   arr.push(Number.isFinite(value) ? value : 0);

  1621.   if (arr.length > sparkHistoryLimit) arr.splice(0, arr.length - sparkHistoryLimit);

  1622. }

  1623. 

  1624. function setConnectionBusy() {

  1625.   setConnection(true, 'busy');

  1626. }

  1627. 

  1628. function beginRequest() {

  1629.   state.pendingRequests += 1;

  1630.   setConnectionBusy();

  1631.   render();

  1632. }

  1633. 

  1634. function endRequest() {

  1635.   state.pendingRequests = Math.max(0, state.pendingRequests - 1);

  1636.   if (state.server.configOk || state.server.runtimeOk) {

  1637.     setConnection(true, state.pendingRequests > 0 ? 'busy' : 'connected');

  1638.   }

  1639.   render();

  1640. }

  1641. 

  1642. async function sendPatch(patch, { successMessage = 'Applied', clearKeys = [] } = {}) {

  1643.   beginRequest();

  1644.   try {

  1645.     const result = await api('/config', {

  1646.       method: 'POST',

  1647.       headers: { 'Content-Type': 'application/json' },

  1648.       body: JSON.stringify(patch),

  1649.     });

  1650.     if (state.server.config) mergeLocalConfigPatch(patch);

  1651.     clearDirty(clearKeys);

  1652.     render();

  1653.     toast(successMessage + (result.live ? ' · live' : ''), 'ok');

  1654.     log('PATCH ' + JSON.stringify(patch) + (result.live ? ' [live]' : ' [saved]'), 'ok');

  1655.     await Promise.allSettled([

  1656.       loadConfig({ silent: true }),

  1657.       loadRuntime({ silent: true }),

  1658.     ]);

  1659.     return result;

  1660.   } catch (error) {

  1661.     toast(error.message, 'err');

  1662.     log('PATCH failed: ' + error.message, 'err');

  1663.     throw error;

  1664.   } finally {

  1665.     endRequest();

  1666.   }

  1667. }

  1668. 

  1669. function mergeLocalConfigPatch(patch) {

  1670.   const cfg = state.server.config || {};

  1671.   cfg.fm ||= {};

  1672.   cfg.rds ||= {};

  1673.   for (const [key, value] of Object.entries(patch)) {

  1674.     switch (key) {

  1675.       case 'frequencyMHz': cfg.fm.frequencyMHz = value; break;

  1676.       case 'stereoEnabled': cfg.fm.stereoEnabled = value; break;

  1677.       case 'limiterEnabled': cfg.fm.limiterEnabled = value; break;

  1678.       case 'rdsEnabled': cfg.rds.enabled = value; break;

  1679.       case 'ps': cfg.rds.ps = value; break;

  1680.       case 'radioText': cfg.rds.radioText = value; break;

  1681.     }

  1682.   }

  1683. }

  1684. 

  1685. async function applySection(section) {

  1686.   if (sectionHasErrors(section)) {

  1687.     toast('Fix the highlighted fields first', 'warn');

  1688.     log(section.toUpperCase() + ' apply blocked by validation errors', 'warn');

  1689.     render();

  1690.     return;

  1691.   }

  1692.   const patch = getSectionPatch(section);

  1693.   const keys = Object.keys(patch);

  1694.   if (!keys.length) {

  1695.     toast('No changes to apply', 'info');

  1696.     return;

  1697.   }

  1698.   let message = 'Applied';

  1699.   if (section === 'freq') message = 'Frequency updated';

  1700.   if (section === 'rds') message = 'RDS text updated';

  1701.   await sendPatch(patch, { successMessage: message, clearKeys: keys });

  1702. }

  1703. 

  1704. function resetSection(section) {

  1705.   const keys = Object.keys(fields).filter((key) => fields[key].section === section);

  1706.   clearDirty(keys);

  1707.   log(section.toUpperCase() + ' draft reset', 'warn');

  1708.   toast('Draft reset', 'info');

  1709. }

  1710. 

  1711. async function setToggle(key, nextValue) {

  1712.   if (state.toggleBusy[key]) return;

  1713.   state.toggleBusy[key] = true;

  1714.   render();

  1715.   try {

  1716.     await sendPatch({ [key]: nextValue }, {

  1717.       successMessage: key.replace(/Enabled$/, '') + ' ' + (nextValue ? 'enabled' : 'disabled'),

  1718.       clearKeys: [],

  1719.     });

  1720.   } finally {

  1721.     state.toggleBusy[key] = false;

  1722.     render();

  1723.   }

  1724. }

  1725. 

  1726. async function txAction(action) {

  1727.   if (state.txBusy) return;

  1728.   state.txBusy = true;

  1729.   render();

  1730.   beginRequest();

  1731.   try {

  1732.     await api(`/tx/${action}`, { method: 'POST' });

  1733.     toast(action === 'start' ? 'TX started' : 'TX stopped', 'ok');

  1734.     log('TX ' + action + ' request accepted', 'ok');

  1735.     await Promise.allSettled([

  1736.       loadRuntime({ silent: true }),

  1737.       loadConfig({ silent: true }),

  1738.     ]);

  1739.   } catch (error) {

  1740.     toast(error.message, 'err');

  1741.     log('TX ' + action + ' failed: ' + error.message, 'err');

  1742.   } finally {

  1743.     state.txBusy = false;

  1744.     endRequest();

  1745.     render();

  1746.   }

  1747. }

  1748. 

  1749. async function resetFaultAction() {

  1750.   if (state.faultResetBusy) return;

  1751.   state.faultResetBusy = true;

  1752.   render();

  1753.   beginRequest();

  1754.   try {

  1755.     await api('/runtime/fault/reset', { method: 'POST' });

  1756.     toast('Fault reset', 'ok');

  1757.     log('Fault reset request accepted', 'ok');

  1758.     await loadRuntime({ silent: true });

  1759.   } catch (error) {

  1760.     toast(error.message, 'err');

  1761.     log('Fault reset failed: ' + error.message, 'err');

  1762.   } finally {

  1763.     state.faultResetBusy = false;

  1764.     endRequest();

  1765.     render();

  1766.   }

  1767. }

  1768. 

  1769. function fmt(n) {

  1770.   if (n == null) return '--';

  1771.   if (n >= 1e9) return (n / 1e9).toFixed(2) + 'G';

  1772.   if (n >= 1e6) return (n / 1e6).toFixed(2) + 'M';

  1773.   if (n >= 1e3) return (n / 1e3).toFixed(1) + 'k';

  1774.   return String(n);

  1775. }

  1776. 

  1777. function fmtTime(seconds) {

  1778.   if (!seconds || seconds <= 0) return '--';

  1779.   const h = Math.floor(seconds / 3600);

  1780.   const m = Math.floor((seconds % 3600) / 60);

  1781.   const s = Math.floor(seconds % 60);

  1782.   if (h > 0) return `${h}h ${m}m`;

  1783.   if (m > 0) return `${m}m ${s}s`;

  1784.   return `${s}s`;

  1785. }

  1786. 

  1787. function fmtDurationSeconds(value) {

  1788.   if (!Number.isFinite(value) || value < 0) return '--';

  1789.   if (value >= 1) return `${value.toFixed(2)} s`;

  1790.   return `${(value * 1000).toFixed(0)} ms`;

  1791. }

  1792. 

  1793. function fmtBool(v) {

  1794.   return v == null ? '--' : (v ? 'ON' : 'OFF');

  1795. }

  1796. 

  1797. function fmtFreq(v) {

  1798.   return typeof v === 'number' ? v.toFixed(1) + ' MHz' : '--';

  1799. }

  1800. 

  1801. function fmtPercent(v) {

  1802.   if (typeof v !== 'number') return '--';

  1803.   return (v * 100).toFixed(0) + '%';

  1804. }

  1805. 

  1806. function ageString(ts) {

  1807.   if (!ts) return '--';

  1808.   const diff = Math.max(0, Math.floor((nowTs() - ts) / 1000));

  1809.   if (diff < 2) return 'just now';

  1810.   if (diff < 60) return diff + 's ago';

  1811.   const m = Math.floor(diff / 60);

  1812.   if (m < 60) return m + 'm ago';

  1813.   const h = Math.floor(m / 60);

  1814.   return h + 'h ago';

  1815. }

  1816. 

  1817. function updateText(id, text) {

  1818.   const el = $(id);

  1819.   if (el && el.textContent !== String(text)) el.textContent = text;

  1820. }

  1821. 

  1822. function updateHTML(id, html) {

  1823.   const el = $(id);

  1824.   if (el && el.innerHTML !== html) el.innerHTML = html;

  1825. }

  1826. 

  1827. function syncDirtyInput(id, key, transform = (v) => v) {

  1828.   const el = $(id);

  1829.   if (!el) return;

  1830.   const dirty = state.dirty.has(key);

  1831.   const desired = dirty ? transform(state.draft[key]) : transform(serverValue(key));

  1832.   const asString = desired == null ? '' : String(desired);

  1833.   const isFocused = document.activeElement === el;

  1834.   if (!isFocused || !dirty) {

  1835.     if (el.value !== asString) el.value = asString;

  1836.   }

  1837.   el.classList.toggle('input-dirty', dirty && !state.errors[key]);

  1838.   el.classList.toggle('input-error', !!state.errors[key]);

  1839. }

  1840. 

  1841. function renderFieldErrors() {

  1842.   renderFieldError('freq-error', state.errors.frequencyMHz);

  1843.   renderFieldError('ps-error', state.errors.ps);

  1844.   renderFieldError('rt-error', state.errors.radioText);

  1845. }

  1846. 

  1847. function renderFieldError(id, message) {

  1848.   const el = $(id);

  1849.   el.textContent = message || '';

  1850.   el.classList.toggle('show', !!message);

  1851. }

  1852. 

  1853. function setMeter(fillId, textId, ratio, text, mode = 'good') {

  1854.   const fill = $(fillId);

  1855.   const pct = Math.max(0, Math.min(100, Math.round((ratio ?? 0) * 100)));

  1856.   fill.style.width = pct + '%';

  1857.   fill.className = 'meter-fill' + (mode === 'warn' ? ' warn' : mode === 'err' ? ' err' : '');

  1858.   updateText(textId, text);

  1859. }

  1860. 

  1861. function applyMobilePanelDefaults() {

  1862.   if (!mobileMq.matches || state.mobilePanelsApplied) return;

  1863.   state.mobilePanelsApplied = true;

  1864.   document.querySelectorAll('.panel[data-panel-key]').forEach((panel) => {

  1865.     const key = panel.dataset.panelKey;

  1866.     const head = panel.querySelector('.panel-head');

  1867.     const body = panel.querySelector('.panel-body');

  1868.     const keepOpen = key === 'frequency' || key === 'danger';

  1869.     head.classList.toggle('collapsed', !keepOpen);

  1870.     body.classList.toggle('collapsed', !keepOpen);

  1871.   });

  1872. }

  1873. 

  1874. function syncFreqPresetIndex(value) {

  1875.   if (typeof value !== 'number') return;

  1876.   let closestIndex = 0;

  1877.   let closestDistance = Infinity;

  1878.   freqPresetValues.forEach((freq, idx) => {

  1879.     const dist = Math.abs(freq - value);

  1880.     if (dist < closestDistance) {

  1881.       closestDistance = dist;

  1882.       closestIndex = idx;

  1883.     }

  1884.   });

  1885.   state.freqPresetIndex = closestIndex;

  1886. }

  1887. 

  1888. function cycleFreqPreset(direction) {

  1889.   state.freqPresetIndex = (state.freqPresetIndex + direction + freqPresetValues.length) % freqPresetValues.length;

  1890.   const next = freqPresetValues[state.freqPresetIndex];

  1891.   setDirty('frequencyMHz', next);

  1892.   toast(`Preset ${next.toFixed(1)} MHz loaded`, 'info');

  1893. }

  1894. 

  1895. function refreshPresetButtons() {

  1896.   const effectiveFreq = effectiveValue('frequencyMHz');

  1897.   document.querySelectorAll('[data-freq-preset]').forEach((btn) => {

  1898.     const value = Number(btn.dataset.freqPreset);

  1899.     btn.classList.toggle('active', typeof effectiveFreq === 'number' && nearlyEqual(value, effectiveFreq, 0.05));

  1900.   });

  1901. }

  1902. 

  1903. function updateHeroState(engineState) {

  1904.   const hero = $('hero-card');

  1905.   hero.classList.remove('tx-live', 'tx-busy');

  1906.   if (state.txBusy || ['starting', 'stopping'].includes(engineState)) {

  1907.     hero.classList.add('tx-busy');

  1908.   } else if (engineState === 'running') {

  1909.     hero.classList.add('tx-live');

  1910.   }

  1911. }

  1912. 

  1913. function drawSparkline(svgId, values, mode = 'good', maxOverride = null) {

  1914.   const svg = $(svgId);

  1915.   if (!svg) return;

  1916.   svg.className = `spark ${mode}`;

  1917.   const width = 160;

  1918.   const height = 34;

  1919.   const points = values.length ? values : [0, 0];

  1920.   const max = maxOverride != null ? maxOverride : Math.max(...points, 1);

  1921.   const min = 0;

  1922.   const step = points.length <= 1 ? width : width / (points.length - 1);

  1923.   const coords = points.map((value, i) => {

  1924.     const x = i * step;

  1925.     const norm = max === min ? 0 : (value - min) / (max - min || 1);

  1926.     const y = height - 4 - norm * (height - 8);

  1927.     return [x, y];

  1928.   });

  1929.   const line = coords.map(([x, y], i) => `${i === 0 ? 'M' : 'L'}${x.toFixed(2)},${y.toFixed(2)}`).join(' ');

  1930.   const area = `${line} L ${width},${height} L 0,${height} Z`;

  1931.   svg.innerHTML = `<path class="area" d="${area}"></path><path class="line" d="${line}"></path>`;

  1932. }

  1933. 

  1934. function render() {

  1935.   const cfg = state.server.config || {};

  1936.   const runtime = state.server.runtime || {};

  1937.   const engine = runtime.engine || {};

  1938.   const driver = runtime.driver || {};

  1939.   const audioStream = runtime.audioStream || null;

  1940. 

  1941.   const appliedRaw = engine.appliedFrequencyMHz;

  1942.   const appliedFreq = Number.isFinite(Number(appliedRaw)) ? Number(appliedRaw) : null;

  1943.   const desiredRaw = cfg.fm?.frequencyMHz;

  1944.   const desiredFreq = Number.isFinite(Number(desiredRaw)) ? Number(desiredRaw) : null;

  1945.   const displayFreq = appliedFreq ?? effectiveValue('frequencyMHz') ?? desiredFreq;

  1946.   updateHTML('freq-display', `${typeof displayFreq === 'number' ? displayFreq.toFixed(1) : '---.-'}<span class="unit">MHz</span>`);

  1947.   const appliedLabel = appliedFreq != null ? `Applied ${appliedFreq.toFixed(1)} MHz` : 'Applied --';

  1948.   const desiredLabel = desiredFreq != null ? `Desired ${desiredFreq.toFixed(1)} MHz` : 'Desired --';

  1949.   updateText('freq-applied', appliedLabel);

  1950.   updateText('freq-desired', desiredLabel);

  1951.   const noteEl = $('freq-note');

  1952.   if (noteEl) {

  1953.     const mismatch = appliedFreq != null && desiredFreq != null && !nearlyEqual(appliedFreq, desiredFreq, 0.001);

  1954.     noteEl.classList.toggle('mismatch', mismatch);

  1955.   }

  1956. 

  1957.   updateText('badge-backend', cfg.backend?.kind || cfg.backend || '--');

  1958.   updateText('badge-mode', engine.state && engine.state !== 'idle' ? 'TX Active' : 'Control Plane');

  1959.   updateText('badge-live', state.server.runtimeOk ? 'Connected' : 'Waiting');

  1960. 

  1961.   updateText('t-chunks', fmt(engine.chunksProduced));

  1962.   updateText('t-samples', fmt(engine.totalSamples));

  1963.   updateText('t-uptime', fmtTime(engine.uptimeSeconds));

  1964.   updateText('t-rate', driver.effectiveSampleRateHz ? (driver.effectiveSampleRateHz / 1000).toFixed(0) + 'k' : '--');

  1965.   const underruns = engine.underruns ?? driver.underruns;

  1966.   const underrunEl = $('t-underruns');

  1967.   underrunEl.textContent = underruns == null ? '--' : String(underruns);

  1968.   underrunEl.className = 'value' + (underruns > 0 ? ' err' : underruns === 0 ? ' good' : '');

  1969. 

  1970.   const txStateValue = String(engine.state || 'idle').toLowerCase();

  1971.   const txState = state.txBusy ? 'WORKING…' : txStateValue.toUpperCase();

  1972.   const txClass = state.txBusy ? 'working' : txStateValue;

  1973.   $('tx-state').textContent = txState;

  1974.   $('tx-state').className = 'tx-state ' + txClass;

  1975.   updateText('tx-hint', engine.lastError ? `Last error: ${engine.lastError}` : (state.txBusy ? 'Command in progress' : 'Runtime polled every 1s'));

  1976.   updateHeroState(txStateValue);

  1977. 

  1978.   const startDisabled = state.txBusy || txStateValue === 'running';

  1979.   const stopDisabled = state.txBusy || ['idle', 'stopped', ''].includes(txStateValue);

  1980.   $('btn-start').disabled = startDisabled;

  1981.   $('btn-stop').disabled = stopDisabled;

  1982.   $('btn-refresh').disabled = state.pendingRequests > 0;

  1983.   $('danger-stop').disabled = stopDisabled;

  1984.   $('danger-refresh').disabled = state.pendingRequests > 0;

  1985.   const resetFaultBtn = $('danger-reset-fault');

  1986.   if (resetFaultBtn) {

  1987.     const resetDisabled = state.faultResetBusy || !state.server.runtimeOk;

  1988.     resetFaultBtn.disabled = resetDisabled;

  1989.     resetFaultBtn.textContent = state.faultResetBusy ? 'Resetting…' : 'Reset Fault';

  1990.   }

  1991. 

  1992.   syncDirtyInput('freq-slider', 'frequencyMHz', (v) => typeof v === 'number' ? v.toFixed(1) : '100.0');

  1993.   syncDirtyInput('freq-num', 'frequencyMHz', (v) => typeof v === 'number' ? v.toFixed(1) : '100.0');

  1994.   syncDirtyInput('rds-ps', 'ps', (v) => String(v ?? ''));

  1995.   syncDirtyInput('rds-rt', 'radioText', (v) => String(v ?? ''));

  1996. 

  1997.   const psValue = String(effectiveValue('ps') ?? cfg.rds?.ps ?? '');

  1998.   const rtValue = String(effectiveValue('radioText') ?? cfg.rds?.radioText ?? '');

  1999.   updateText('ps-count', psValue.length);

  2000.   updateText('rt-count', rtValue.length);

  2001.   renderFieldErrors();

  2002.   refreshPresetButtons();

  2003. 

  2004.   renderToggle('stereoEnabled', 'tog-stereo', 'stereo-label');

  2005.   renderToggle('rdsEnabled', 'tog-rds', 'rds-label');

  2006.   renderToggle('limiterEnabled', 'tog-limiter', 'limiter-label');

  2007. 

  2008.   const freqDirty = isDirtySection('freq');

  2009.   $('freq-apply').disabled = !freqDirty || sectionHasErrors('freq');

  2010.   $('freq-reset').disabled = !freqDirty;

  2011.   const rdsDirty = isDirtySection('rds');

  2012.   $('rds-apply').disabled = !rdsDirty || sectionHasErrors('rds');

  2013.   $('rds-reset').disabled = !rdsDirty;

  2014. 

  2015.   updateText('freq-meta', sectionHasErrors('freq') ? 'Validation error' : (freqDirty ? 'Unsaved changes' : 'Live-tunable'));

  2016.   updateText('rds-meta', sectionHasErrors('rds') ? 'Validation error' : (rdsDirty ? `${Object.keys(getSectionPatch('rds')).length} unsaved` : 'PS + RT'));

  2017. 

  2018.   updateText('info-backend', cfg.backend?.kind || cfg.backend || '--');

  2019.   updateText('info-freq', fmtFreq(cfg.fm?.frequencyMHz));

  2020.   updateText('info-preemph', cfg.fm?.preEmphasisTauUS ? `${cfg.fm.preEmphasisTauUS} µs` : 'Off');

  2021.   updateText('info-fmmod', fmtBool(cfg.fm?.fmModulationEnabled));

  2022.   updateText('info-live', engine.state ? `${String(engine.state).toUpperCase()} / ${state.server.runtimeOk ? 'runtime ok' : 'runtime pending'}` : (state.server.configOk ? 'config only' : '--'));

  2023. 

  2024.   updateHealth(engine, driver, audioStream);

  2025.   updateControlAudit(runtime.controlAudit);

  2026.   updateFaultHistory(engine);

  2027.   updateTransitionHistory();

  2028.   updateResetHint(engine);

  2029.   updateMeters(engine, driver, audioStream);

  2030.   const highWatermarkDurationSecondsRaw = audioStream?.highWatermarkDurationSeconds;

  2031.   const highWatermarkDurationSeconds = Number(highWatermarkDurationSecondsRaw);

  2032.   const highWatermarkFramesRaw = audioStream?.highWatermark;

  2033.   const highWatermarkFrames = Number.isFinite(Number(highWatermarkFramesRaw)) ? Number(highWatermarkFramesRaw) : 0;

  2034.   const capacityRaw = audioStream?.capacity;

  2035.   const capacity = Number.isFinite(Number(capacityRaw)) ? Number(capacityRaw) : 0;

  2036.   const bufferedDurationSecondsRaw = audioStream?.bufferedDurationSeconds;

  2037.   const bufferedDurationSeconds = Number(bufferedDurationSecondsRaw);

  2038.   const hasBufferedDuration = Number.isFinite(bufferedDurationSeconds);

  2039.   const hasHighWatermarkDuration = Number.isFinite(highWatermarkDurationSeconds);

  2040.   const highWatermarkRatio = capacity > 0 ? Math.min(1, highWatermarkFrames / capacity) : 0;

  2041.   let highWatermarkMode = 'good';

  2042.   if (highWatermarkRatio >= 0.95) highWatermarkMode = 'err';

  2043.   else if (highWatermarkRatio >= 0.65) highWatermarkMode = 'warn';

  2044.   const sparkHighWatermarkMax = Math.max(

  2045.     1,

  2046.     hasHighWatermarkDuration ? highWatermarkDurationSeconds : 0,

  2047.     hasBufferedDuration ? bufferedDurationSeconds : 0

  2048.   );

  2049.   const queueHealthRaw = String(engine.queue?.health || '').toLowerCase();

  2050.   let queueSparkMode = 'good';

  2051.   if (queueHealthRaw === 'critical') queueSparkMode = 'err';

  2052.   else if (queueHealthRaw === 'low') queueSparkMode = 'warn';

  2053.   drawSparkline('spark-audio', state.charts.audio, 'good', 1);

  2054.   drawSparkline('spark-high-watermark', state.charts.highWatermark, highWatermarkMode, sparkHighWatermarkMax);

  2055.   drawSparkline('spark-queue-fill', state.charts.queueFill, queueSparkMode, 1);

  2056.   drawSparkline('spark-underruns', state.charts.underruns, underruns > 0 ? 'err' : 'warn');

  2057.   drawSparkline('spark-tx', state.charts.tx, txStateValue === 'running' ? 'good' : 'warn', 1);

  2058.   applyMobilePanelDefaults();

  2059. }

  2060. 

  2061. function renderToggle(key, toggleId, labelId) {

  2062.   const on = !!serverValue(key);

  2063.   const busy = !!state.toggleBusy[key];

  2064.   const el = $(toggleId);

  2065.   el.className = 'toggle' + (on ? ' on' : '') + (busy ? ' busy' : '');

  2066.   el.setAttribute('aria-checked', on ? 'true' : 'false');

  2067.   updateText(labelId, busy ? '...' : (on ? 'ON' : 'OFF'));

  2068. }

  2069. 

  2070. function runtimeStateClass(engineState) {

  2071.   const normalized = String(engineState || '').toLowerCase();

  2072.   if (!normalized) {

  2073.     return 'warn';

  2074.   }

  2075.   switch (normalized) {

  2076.     case 'faulted':

  2077.       return 'err';

  2078.     case 'muted':

  2079.     case 'degraded':

  2080.     case 'prebuffering':

  2081.     case 'arming':

  2082.     case 'stopping':

  2083.     case 'idle':

  2084.     case 'unknown':

  2085.       return 'warn';

  2086.     default:

  2087.       return 'good';

  2088.   }

  2089. }

  2090. 

  2091. 

  2092. 

  2093. function normalizeRuntimeState(stateName) {

  2094.   const normalized = (typeof stateName === 'string' ? stateName.trim().toLowerCase() : '');

  2095.   return normalized || 'idle';

  2096. }

  2097. 

  2098. function runtimeStateSeverity(stateName) {

  2099.   const normalized = normalizeRuntimeState(stateName);

  2100.   switch (normalized) {

  2101.     case 'running':

  2102.       return 'ok';

  2103.     case 'degraded':

  2104.     case 'muted':

  2105.       return 'warn';

  2106.     case 'faulted':

  2107.       return 'err';

  2108.     default:

  2109.       return 'info';

  2110.   }

  2111. }

  2112. 

  2113. function notifyRuntimeTransition(engine, pushHistory = true) {

  2114.   if (!engine) return;

  2115.   const next = normalizeRuntimeState(engine.state);

  2116.   const prev = state.lastRuntimeState;

  2117.   state.lastRuntimeState = next;

  2118.   if (!prev || prev === next) return;

  2119.   const severity = runtimeStateSeverity(next);

  2120.   if (pushHistory) {

  2121.     pushTransitionHistory(prev, next, severity);

  2122.   }

  2123.   const message = `Runtime ${prev.toUpperCase()} → ${next.toUpperCase()}`;

  2124.   const logLevel = severity === 'err' ? 'err' : (severity === 'warn' ? 'warn' : 'info');

  2125.   toast(message, severity);

  2126.   log(message, logLevel);

  2127. }

  2128. 

  2129. 

  2130. function updateHealth(engine, driver, audioStream) {

  2131.   engine = engine || {};

  2132.   driver = driver || {};

  2133.   updateText('health-http', state.server.configOk ? 'OK' : 'OFFLINE');

  2134.   $('health-http').className = 'val ' + (state.server.configOk ? 'good' : 'err');

  2135. 

  2136.   let runtimeLabel = 'WAITING';

  2137.   let runtimeClass = 'warn';

  2138.   if (state.server.runtimeOk) {

  2139.     const engineStateName = String(engine.state || 'unknown');

  2140.     runtimeLabel = engineStateName.toUpperCase();

  2141.     runtimeClass = runtimeStateClass(engineStateName);

  2142.   }

  2143.   updateText('health-runtime', runtimeLabel);

  2144.   $('health-runtime').className = 'val ' + runtimeClass;

  2145. 

  2146.   const durationSeconds = Number(engine.runtimeStateDurationSeconds);

  2147.   const durationLabel = Number.isFinite(durationSeconds) && durationSeconds > 0 ? fmtTime(durationSeconds) : '--';

  2148.   updateText('health-state-age', durationLabel);

  2149.   const stateAgeEl = $('health-state-age');

  2150.   if (stateAgeEl) {

  2151.     stateAgeEl.className = 'val ' + runtimeClass;

  2152.   }

  2153. 

  2154.   const runtimeIndicator = engine.runtimeIndicator;

  2155.   const indicatorLabels = {

  2156.     normal: 'Normal',

  2157.     degraded: 'Degraded',

  2158.     queueCritical: 'Queue critical',

  2159.   };

  2160.   const indicatorText = indicatorLabels[runtimeIndicator] || (runtimeIndicator ? runtimeIndicator : '--');

  2161.   let indicatorSeverity = '';

  2162.   if (runtimeIndicator === 'queueCritical') indicatorSeverity = 'err';

  2163.   else if (runtimeIndicator === 'degraded') indicatorSeverity = 'warn';

  2164.   else if (runtimeIndicator === 'normal') indicatorSeverity = 'good';

  2165.   const indicatorEl = $('health-indicator');

  2166.   if (indicatorEl) {

  2167.     indicatorEl.className = 'val' + (indicatorSeverity ? ' ' + indicatorSeverity : '');

  2168.   }

  2169.   updateText('health-indicator', indicatorText);

  2170. 

  2171.   const runtimeAlertRaw = (engine.runtimeAlert || '').trim();

  2172.   const hasAlert = !!runtimeAlertRaw;

  2173.   const alertEl = $('health-alert');

  2174.   if (alertEl) {

  2175.     alertEl.className = 'val ' + (hasAlert ? 'warn' : 'good');

  2176.   }

  2177.   updateText('health-alert', hasAlert ? runtimeAlertRaw : 'None');

  2178. 

  2179.   let audioLabel = 'N/A';

  2180.   let audioClass = 'val';

  2181.   if (audioStream) {

  2182.     const fill = typeof audioStream.buffered === 'number' ? audioStream.buffered : null;

  2183.     audioLabel = fill == null ? 'Unknown' : fmtPercent(fill);

  2184.     if (fill == null) audioClass = 'val';

  2185.     else if (fill < 0.05) audioClass = 'val err';

  2186.     else if (fill < 0.2) audioClass = 'val warn';

  2187.     else audioClass = 'val good';

  2188.   }

  2189.   updateText('health-audio', audioLabel);

  2190.   $('health-audio').className = audioClass;

  2191. 

  2192.   const bufferedDurationSeconds = Number(audioStream?.bufferedDurationSeconds);

  2193.   updateText('health-buffer-duration', fmtDurationSeconds(bufferedDurationSeconds));

  2194. 

  2195.   const highWatermarkRaw = audioStream?.highWatermark;

  2196.   const highWatermarkFrames = Number.isFinite(Number(highWatermarkRaw)) ? Number(highWatermarkRaw) : null;

  2197.   const highWatermarkDurationRaw = audioStream?.highWatermarkDurationSeconds;

  2198.   const highWatermarkDuration = Number.isFinite(Number(highWatermarkDurationRaw)) ? Number(highWatermarkDurationRaw) : null;

  2199.   let highWatermarkLabel = '--';

  2200.   if (highWatermarkDuration !== null) {

  2201.     highWatermarkLabel = fmtDurationSeconds(highWatermarkDuration);

  2202.     if (highWatermarkFrames !== null) {

  2203.       highWatermarkLabel += ` (${highWatermarkFrames} frames)`;

  2204.     }

  2205.   } else if (highWatermarkFrames !== null) {

  2206.     highWatermarkLabel = `${highWatermarkFrames} frames`;

  2207.   }

  2208.   updateText('health-buffer-highwater', highWatermarkLabel);

  2209. 

  2210.   const queueFill = Number(engine.queue?.fillLevel);

  2211.   const queueHealthRaw = String(engine.queue?.health || '').toLowerCase();

  2212.   const queueHealthLabel = queueHealthRaw ? queueHealthRaw[0].toUpperCase() + queueHealthRaw.slice(1) : '';

  2213.   let queueFillLabel = '--';

  2214.   if (Number.isFinite(queueFill)) {

  2215.     queueFillLabel = fmtPercent(queueFill);

  2216.     if (queueHealthLabel) queueFillLabel += ` · ${queueHealthLabel}`;

  2217.   } else if (queueHealthLabel) {

  2218.     queueFillLabel = queueHealthLabel;

  2219.   }

  2220.   updateText('health-queue-fill', queueFillLabel);

  2221.   const queueFillEl = $('health-queue-fill');

  2222.   if (queueFillEl) {

  2223.     let queueFillClass = 'good';

  2224.     if (queueHealthRaw === 'critical') queueFillClass = 'err';

  2225.     else if (queueHealthRaw === 'low') queueFillClass = 'warn';

  2226.     queueFillEl.className = 'val ' + queueFillClass;

  2227.   }

  2228. 

  2229.   const streakEl = $('health-underrun-streak');

  2230.   if (streakEl) {

  2231.     const streakRaw = driver?.underrunStreak;

  2232.     const streakMaxRaw = driver?.maxUnderrunStreak;

  2233.     const streakCurrent = Number.isFinite(Number(streakRaw)) ? Number(streakRaw) : null;

  2234.     const streakMax = Number.isFinite(Number(streakMaxRaw)) ? Number(streakMaxRaw) : null;

  2235.     let streakLabel = '--';

  2236.     if (streakCurrent != null) {

  2237.       streakLabel = String(streakCurrent);

  2238.       if (streakMax != null) {

  2239.         streakLabel += ` (max ${streakMax})`;

  2240.       }

  2241.     } else if (streakMax != null) {

  2242.       streakLabel = `Max ${streakMax}`;

  2243.     }

  2244.     let streakSeverity = '';

  2245.     if (streakCurrent != null || streakMax != null) {

  2246.       const highestStreak = Math.max(

  2247.         streakCurrent != null ? streakCurrent : 0,

  2248.         streakMax != null ? streakMax : 0

  2249.       );

  2250.       if (highestStreak >= 6) streakSeverity = ' err';

  2251.       else if (highestStreak > 0) streakSeverity = ' warn';

  2252.       else streakSeverity = ' good';

  2253.     }

  2254.     streakEl.textContent = streakLabel;

  2255.     streakEl.className = 'val' + streakSeverity;

  2256.   }

  2257. 

  2258.   const last = Math.max(state.server.lastConfigAt || 0, state.server.lastRuntimeAt || 0);

  2259.   updateText('health-last', ageString(last));

  2260. 

  2261.   const transitionsAvailable = engine.degradedTransitions != null || engine.mutedTransitions != null || engine.faultedTransitions != null;

  2262.   const transitionsText = transitionsAvailable ? `${Number(engine.degradedTransitions ?? 0)} / ${Number(engine.mutedTransitions ?? 0)} / ${Number(engine.faultedTransitions ?? 0)}` : '--';

  2263.   updateText('health-transitions', transitionsText);

  2264. 

  2265.   const faultCountValue = engine.faultCount != null ? Number(engine.faultCount) : 0;

  2266.   const hasFaultCount = engine.faultCount != null;

  2267.   updateText('health-fault-count', hasFaultCount ? String(faultCountValue) : '--');

  2268.   const faultCountEl = $('health-fault-count');

  2269.   if (faultCountEl) {

  2270.     faultCountEl.className = 'val' + (hasFaultCount ? (faultCountValue > 0 ? ' warn' : ' good') : '');

  2271.   }

  2272. 

  2273.   const lastFaultEl = $('health-last-fault');

  2274.   const lastFault = engine.lastFault;

  2275.   if (lastFaultEl) {

  2276.     if (lastFault) {

  2277.       const severity = String(lastFault.severity || '').toLowerCase();

  2278.       const severityClass = severity === 'faulted' ? 'err' : 'warn';

  2279.       const severityLabel = (lastFault.severity || 'Fault').toUpperCase();

  2280.       const reasonLabel = lastFault.reason ? ` ${lastFault.reason}` : '';

  2281.       const messageLabel = lastFault.message ? ` - ${lastFault.message}` : '';

  2282.       let whenLabel = '';

  2283.       if (lastFault.time) {

  2284.         const parsed = new Date(lastFault.time);

  2285.         if (!Number.isNaN(parsed.getTime())) {

  2286.           whenLabel = ` @ ${parsed.toLocaleTimeString()}`;

  2287.         }

  2288.       }

  2289.       const title = `${severityLabel}${reasonLabel}`;

  2290.       updateText('health-last-fault', `${title}${messageLabel}${whenLabel}`);

  2291.       lastFaultEl.className = 'val ' + severityClass;

  2292.     } else {

  2293.       lastFaultEl.className = 'val good';

  2294.       updateText('health-last-fault', 'None');

  2295.     }

  2296.   }

  2297. }

  2298. 

  2299. 

  2300. 

  2301. function updateControlAudit(audit) {

  2302.   const entries = [

  2303.     { key: 'methodNotAllowed', id: 'audit-methodNotAllowed' },

  2304.     { key: 'unsupportedMediaType', id: 'audit-unsupportedMediaType' },

  2305.     { key: 'bodyTooLarge', id: 'audit-bodyTooLarge' },

  2306.     { key: 'unexpectedBody', id: 'audit-unexpectedBody' },

  2307.   ];

  2308.   let total = 0;

  2309.   let hasData = false;

  2310.   entries.forEach(({ key, id }) => {

  2311.     const raw = audit && typeof audit[key] !== 'undefined' ? Number(audit[key]) : NaN;

  2312.     const value = Number.isFinite(raw) ? raw : null;

  2313.     if (value != null) {

  2314.       hasData = true;

  2315.       total += value;

  2316.     }

  2317.     setAuditValue(id, value);

  2318.   });

  2319.   setAuditValue('audit-total', hasData ? total : null);

  2320. }

  2321. 

  2322. function setAuditValue(id, count) {

  2323.   const el = $(id);

  2324.   if (!el) return;

  2325.   if (count == null) {

  2326.     el.textContent = '--';

  2327.     el.className = 'val';

  2328.     return;

  2329.   }

  2330.   el.textContent = String(count);

  2331.   el.className = 'val ' + (count > 0 ? 'warn' : 'good');

  2332. }

  2333. 

  2334. function updateFaultHistory(engine) {

  2335.   const container = $('fault-history');

  2336.   if (!container) return;

  2337.   const history = Array.isArray(engine?.faultHistory) ? engine.faultHistory : [];

  2338.   if (!history.length) {

  2339.     container.innerHTML = '<div class="fault-history-empty">No faults recorded yet.</div>';

  2340.     return;

  2341.   }

  2342.   const rows = history.slice().reverse().map((entry) => {

  2343.     const when = entry?.time ? new Date(entry.time) : null;

  2344.     const timeLabel = when && !Number.isNaN(when.getTime()) ? when.toLocaleTimeString() : '--:--';

  2345.     const severity = String(entry?.severity || 'warn').toLowerCase();

  2346.     const severityLabel = String(entry?.severity || 'Fault').toUpperCase();

  2347.     const reasonLabel = entry?.reason ? ` ${entry.reason}` : '';

  2348.     const messageLabel = entry?.message ? ` · ${entry.message}` : '';

  2349.     return `<div class="fault-history-entry ${severity}"><span class="fault-history-time">${timeLabel}</span><span class="fault-history-desc">${severityLabel}${reasonLabel}${messageLabel}</span></div>`;

  2350.   });

  2351.   container.innerHTML = rows.join('');

  2352. }

  2353. 

  2354. function updateResetHint(engine) {

  2355.   const hint = $('reset-hint');

  2356.   if (!hint) return;

  2357.   const stateName = String(engine?.state || '').toLowerCase();

  2358.   let text = 'Manual fault reset drops runtime to DEGRADED while the queue recovers.';

  2359.   if (stateName === 'faulted') {

  2360.     text = 'Faulted: reset moves runtime back to DEGRADED until the queue settles.';

  2361.   } else if (stateName === 'muted' || stateName === 'degraded') {

  2362.     text = 'Reset Fault keeps the runtime in DEGRADED so the queue can recover before running again.';

  2363.   }

  2364.   const durationSeconds = Number(engine?.runtimeStateDurationSeconds);

  2365.   const durationLabel = Number.isFinite(durationSeconds) && durationSeconds > 0 ? fmtTime(durationSeconds) : null;

  2366.   const ageHint = durationLabel ? ` State age ${durationLabel}.` : '';

  2367.   hint.textContent = text + ageHint;

  2368. }

  2369. 

  2370. function updateMeters(engine, driver, audioStream) {

  2371.   if (audioStream && typeof audioStream.buffered === 'number') {

  2372.     const ratio = Math.max(0, Math.min(1, audioStream.buffered));

  2373.     const mode = ratio < 0.05 ? 'err' : ratio < 0.2 ? 'warn' : 'good';

  2374.     setMeter('meter-audio-fill', 'meter-audio-text', ratio, fmtPercent(ratio), mode);

  2375.   } else {

  2376.     setMeter('meter-audio-fill', 'meter-audio-text', 0, 'N/A', 'warn');

  2377.   }

  2378. 

  2379.   const underruns = Number(engine.underruns ?? driver.underruns ?? 0);

  2380.   const healthRatio = underruns <= 0 ? 1 : Math.max(0, 1 - Math.min(underruns, 10) / 10);

  2381.   const healthMode = underruns === 0 ? 'good' : underruns < 3 ? 'warn' : 'err';

  2382.   setMeter('meter-stream-fill', 'meter-stream-text', healthRatio, underruns === 0 ? 'Clean' : `${underruns} underrun${underruns === 1 ? '' : 's'}`, healthMode);

  2383. 

  2384.   const txState = String(engine.state || 'idle').toLowerCase();

  2385.   const activeRatio = txState === 'running' ? 1 : state.txBusy ? 0.55 : 0.08;

  2386.   const activeMode = txState === 'running' ? 'good' : state.txBusy ? 'warn' : 'err';

  2387.   const activeText = txState === 'running' ? 'Live' : state.txBusy ? 'Working' : 'Idle';

  2388.   setMeter('meter-tx-fill', 'meter-tx-text', activeRatio, activeText, activeMode);

  2389. }

  2390. 

  2391. function toast(msg, type = 'info') {

  2392.   const t = $('toast');

  2393.   t.textContent = msg;

  2394.   t.className = 'toast ' + type + ' show';

  2395.   clearTimeout(t._timer);

  2396.   t._timer = setTimeout(() => t.classList.remove('show'), 2600);

  2397. }

  2398. 

  2399. function log(message, type = '') {

  2400.   const logEl = $('log');

  2401.   const empty = logEl.querySelector('.empty-log');

  2402.   if (empty) empty.remove();

  2403.   const row = document.createElement('div');

  2404.   row.className = 'entry ' + type;

  2405.   row.textContent = `${new Date().toLocaleTimeString()}  ${message}`;

  2406.   logEl.appendChild(row);

  2407.   while (logEl.children.length > 250) logEl.removeChild(logEl.firstChild);

  2408.   logEl.scrollTop = logEl.scrollHeight;

  2409. }

  2410. 

  2411. function bindPanels() {

  2412.   document.querySelectorAll('[data-panel]').forEach((head) => {

  2413.     head.addEventListener('click', () => {

  2414.       head.classList.toggle('collapsed');

  2415.       head.nextElementSibling.classList.toggle('collapsed');

  2416.     });

  2417.   });

  2418. }

  2419. 

  2420. function bindInputs() {

  2421.   $('freq-slider').addEventListener('input', (e) => {

  2422.     const value = Number(e.target.value);

  2423.     setDirty('frequencyMHz', value);

  2424.   });

  2425.   $('freq-num').addEventListener('input', (e) => {

  2426.     const value = Number(e.target.value);

  2427.     if (!Number.isNaN(value)) setDirty('frequencyMHz', value);

  2428.     else {

  2429.       state.errors.frequencyMHz = 'Enter a valid number.';

  2430.       render();

  2431.     }

  2432.   });

  2433. 

  2434.   $('rds-ps').addEventListener('input', (e) => setDirty('ps', e.target.value.toUpperCase().slice(0, 8)));

  2435.   $('rds-rt').addEventListener('input', (e) => setDirty('radioText', e.target.value.slice(0, 64)));

  2436. 

  2437.   $('freq-apply').addEventListener('click', () => applySection('freq'));

  2438.   $('rds-apply').addEventListener('click', () => applySection('rds'));

  2439.   $('freq-reset').addEventListener('click', () => resetSection('freq'));

  2440.   $('rds-reset').addEventListener('click', () => resetSection('rds'));

  2441. 

  2442.   $('btn-start').addEventListener('click', () => txAction('start'));

  2443.   $('btn-stop').addEventListener('click', () => txAction('stop'));

  2444.   $('danger-stop').addEventListener('click', () => txAction('stop'));

  2445.   $('btn-refresh').addEventListener('click', manualRefresh);

  2446.   $('danger-refresh').addEventListener('click', manualRefresh);

  2447.   $('danger-reset-fault').addEventListener('click', () => resetFaultAction());

  2448. 

  2449.   document.querySelectorAll('.toggle[data-toggle]').forEach((toggle) => {

  2450.     const key = toggle.dataset.toggle;

  2451.     const handler = () => setToggle(key, !serverValue(key));

  2452.     toggle.addEventListener('click', handler);

  2453.     toggle.addEventListener('keydown', (e) => {

  2454.       if (e.key === 'Enter' || e.key === ' ') {

  2455.         e.preventDefault();

  2456.         handler();

  2457.       }

  2458.     });

  2459.   });

  2460. 

  2461.   document.querySelectorAll('[data-freq-preset]').forEach((btn) => {

  2462.     btn.addEventListener('click', () => {

  2463.       const value = Number(btn.dataset.freqPreset);

  2464.       setDirty('frequencyMHz', value);

  2465.       toast(`Frequency preset ${value.toFixed(1)} MHz loaded`, 'info');

  2466.     });

  2467.   });

  2468. 

  2469.   document.querySelectorAll('[data-rds-ps]').forEach((btn) => {

  2470.     btn.addEventListener('click', () => {

  2471.       setDirty('ps', btn.dataset.rdsPs || '');

  2472.       setDirty('radioText', btn.dataset.rdsRt || '');

  2473.       toast('RDS preset loaded', 'info');

  2474.     });

  2475.   });

  2476. 

  2477.   $('btn-clear-log').addEventListener('click', () => {

  2478.     $('log').innerHTML = '<div class="empty-log">No events yet.</div>';

  2479.     toast('Log cleared', 'info');

  2480.   });

  2481. }

  2482. 

  2483. async function manualRefresh() {

  2484.   beginRequest();

  2485.   try {

  2486.     await Promise.allSettled([

  2487.       loadConfig({ silent: true }),

  2488.       loadRuntime({ silent: true }),

  2489.     ]);

  2490.     toast('Refreshed', 'info');

  2491.     log('Manual refresh completed', 'info');

  2492.   } finally {

  2493.     endRequest();

  2494.   }

  2495. }

  2496. 

  2497. function startPollers() {

  2498.   if (state.pollersStarted) return;

  2499.   state.pollersStarted = true;

  2500.   setInterval(() => { loadRuntime({ silent: true }); }, runtimePollMs);

  2501.   setInterval(() => { loadConfig({ silent: true }); }, configPollMs);

  2502. }

  2503. 

  2504. function bindResponsiveBehavior() {

  2505.   const listener = () => {

  2506.     if (!mobileMq.matches) {

  2507.       state.mobilePanelsApplied = false;

  2508.       return;

  2509.     }

  2510.     applyMobilePanelDefaults();

  2511.   };

  2512.   if (mobileMq.addEventListener) mobileMq.addEventListener('change', listener);

  2513.   else mobileMq.addListener(listener);

  2514. }

  2515. 

  2516. function isTypingContext(target) {

  2517.   if (!target) return false;

  2518.   const tag = (target.tagName || '').toLowerCase();

  2519.   return tag === 'input' || tag === 'textarea' || target.isContentEditable;

  2520. }

  2521. 

  2522. function bindKeyboardShortcuts() {

  2523.   window.addEventListener('keydown', (e) => {

  2524.     if (isTypingContext(e.target)) {

  2525.       if (e.key !== 'Enter') return;

  2526.       if (state.dirty.has('frequencyMHz')) {

  2527.         e.preventDefault();

  2528.         applySection('freq');

  2529.       } else if (isDirtySection('rds')) {

  2530.         e.preventDefault();

  2531.         applySection('rds');

  2532.       }

  2533.       return;

  2534.     }

  2535. 

  2536.     if (e.key === 't' && !e.shiftKey) {

  2537.       e.preventDefault();

  2538.       txAction('start');

  2539.       return;

  2540.     }

  2541.     if ((e.key === 'T') || (e.key === 't' && e.shiftKey)) {

  2542.       e.preventDefault();

  2543.       txAction('stop');

  2544.       return;

  2545.     }

  2546.     if (e.key.toLowerCase() === 'r') {

  2547.       e.preventDefault();

  2548.       manualRefresh();

  2549.       return;

  2550.     }

  2551.     if (e.key === '[') {

  2552.       e.preventDefault();

  2553.       cycleFreqPreset(-1);

  2554.       return;

  2555.     }

  2556.     if (e.key === ']') {

  2557.       e.preventDefault();

  2558.       cycleFreqPreset(1);

  2559.       return;

  2560.     }

  2561.     if (e.key === 'Enter') {

  2562.       e.preventDefault();

  2563.       if (state.dirty.has('frequencyMHz')) applySection('freq');

  2564.       else if (isDirtySection('rds')) applySection('rds');

  2565.     }

  2566.   });

  2567. }

  2568. 

  2569. async function init() {

  2570.   bindPanels();

  2571.   bindInputs();

  2572.   bindResponsiveBehavior();

  2573.   bindKeyboardShortcuts();

  2574.   render();

  2575.   log('fm-rds-tx control UI booting', 'info');

  2576. 

  2577.   await Promise.allSettled([

  2578.     loadConfig({ silent: false }),

  2579.     loadRuntime({ silent: true }),

  2580.   ]);

  2581. 

  2582.   render();

  2583.   startPollers();

  2584.   log('Polling active: runtime 1s, config 8s', 'ok');

  2585.   log('Keyboard shortcuts armed', 'info');

  2586. }

  2587. 

  2588. init();

  2589. </script>

  2590. </body>

  2591. </html>