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=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;600&display=swap');

  9. 

  10. :root {

  11.   --bg: #f7f8fb;

  12.   --bg-2: #eef0f3;

  13.   --surface: #ffffff;

  14.   --surface2: #f4f6f8;

  15.   --surface3: #e8ecf1;

  16.   --border: #d7dcdf;

  17.   --border-strong: #bcc5ce;

  18.   --text: #111724;

  19.   --text-dim: #4c5a6a;

  20.   --text-muted: #6b7683;

  21.   --accent: #1f4d9d;

  22.   --accent-soft: rgba(31, 77, 157, 0.08);

  23.   --green: #0d944a;

  24.   --green-soft: rgba(13, 148, 74, 0.1);

  25.   --amber: #b7791f;

  26.   --amber-soft: rgba(183, 121, 31, 0.12);

  27.   --red: #b03030;

  28.   --red-soft: rgba(176, 48, 48, 0.1);

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

  30.   --display: 'Inter', sans-serif;

  31.   --radius: 8px;

  32.   --shadow: 0 8px 24px rgba(15,23,42,0.08);

  33. }

  34. 

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

  36. html { color-scheme: light; }

  37. body {

  38.   background: linear-gradient(180deg, #fbfcfe 0%, var(--bg) 100%);

  39.   color: var(--text);

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

  41.   font-size: 14px;

  42.   line-height: 1.5;

  43.   min-height: 100vh;

  44.   overflow-x: hidden;

  45. }

  46. 

  47. button, input { font: inherit; }

  48. button { user-select: none; }

  49. 

  50. .app {

  51.   max-width: 1200px;

  52.   margin: 0 auto;

  53.   padding: 24px;

  54. }

  55. 

  56. .header {

  57.   display: flex;

  58.   align-items: flex-start;

  59.   justify-content: space-between;

  60.   gap: 18px;

  61.   padding: 4px 0 20px;

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

  63.   margin-bottom: 20px;

  64. }

  65. .header-main {

  66.   display: flex;

  67.   flex-direction: column;

  68.   gap: 8px;

  69. }

  70. .header h1 {

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

  72.   font-size: 28px;

  73.   font-weight: 800;

  74.   letter-spacing: -0.03em;

  75.   text-transform: none;

  76.   color: var(--text);

  77. }

  78. .header-note {

  79.   font-size: 13px;

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

  81. }

  82. .header-sub {

  83.   display: flex;

  84.   flex-wrap: wrap;

  85.   gap: 8px;

  86. }

  87. .badge {

  88.   display: inline-flex;

  89.   align-items: center;

  90.   gap: 8px;

  91.   min-height: 28px;

  92.   padding: 0 10px;

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

  94.   border-radius: 999px;

  95.   background: var(--surface2);

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

  97.   font-size: 11px;

  98.   text-transform: uppercase;

  99.   letter-spacing: .08em;

  100. }

  101. .badge strong {

  102.   color: var(--text);

  103.   font-weight: 700;

  104. }

  105. .header-status {

  106.   display: flex;

  107.   align-items: center;

  108.   gap: 10px;

  109.   padding-top: 6px;

  110. }

  111. 

  112. .led {

  113.   width: 10px;

  114.   height: 10px;

  115.   border-radius: 50%;

  116.   background: #333;

  117.   box-shadow: none;

  118.   transition: all .25s ease;

  119.   flex-shrink: 0;

  120. }

  121. .led.on-green {

  122.   background: var(--green);

  123.   box-shadow: 0 0 0 3px rgba(13,148,74,0.16);

  124. }

  125. .led.on-red {

  126.   background: var(--red);

  127.   box-shadow: 0 0 0 3px rgba(176,48,48,0.14);

  128. }

  129. .led.on-amber {

  130.   background: var(--amber);

  131.   box-shadow: 0 0 0 3px rgba(183,121,31,0.14);

  132. }

  133. .led.on-blue {

  134.   background: var(--accent);

  135.   box-shadow: 0 0 0 3px rgba(31,77,157,0.14);

  136. }

  137. 

  138. .status-text {

  139.   font-size: 10px;

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

  141.   text-transform: uppercase;

  142.   letter-spacing: .08em;

  143. }

  144. 

  145. .tab-bar {

  146.   display: flex;

  147.   gap: 6px;

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

  149.   padding-bottom: 0;

  150.   margin: 0 0 20px;

  151.   flex-wrap: wrap;

  152.   position: sticky;

  153.   top: 0;

  154.   background: rgba(247,248,251,.92);

  155.   backdrop-filter: blur(8px);

  156.   z-index: 10;

  157. }

  158. .tab-btn {

  159.   border: none;

  160.   border-bottom: 3px solid transparent;

  161.   border-radius: 0;

  162.   background: transparent;

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

  164.   font-size: 13px;

  165.   font-weight: 700;

  166.   padding: 12px 16px 11px;

  167.   cursor: pointer;

  168.   transition: color .16s ease, border-color .16s ease, background-color .16s ease;

  169. }

  170. .tab-btn.active {

  171.   border-bottom-color: var(--accent);

  172.   background: transparent;

  173.   color: var(--accent);

  174. }

  175. .tab-btn:focus-visible {

  176.   outline: 2px solid var(--accent);

  177.   outline-offset: 2px;

  178. }

  179. .tab-panels {

  180.   display: flex;

  181.   flex-direction: column;

  182.   gap: 14px;

  183. }

  184. .tab-panel {

  185.   display: none;

  186. }

  187. .tab-panel.active {

  188.   display: block;

  189. }

  190. .tab-columns {

  191.   display: grid;

  192.   gap: 16px;

  193. }

  194. .tab-columns.two {

  195.   grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);

  196. }

  197. .tab-columns.one {

  198.   grid-template-columns: 1fr;

  199. }

  200. 

  201. 

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

  203. 

  204. .card {

  205.   background: var(--surface);

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

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

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

  209. }

  210. 

  211. .hero {

  212.   padding: 16px;

  213. }

  214. 

  215. .tx-bar {

  216.   position: relative;

  217.   z-index: 1;

  218.   display: grid;

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

  220.   gap: 14px;

  221.   align-items: center;

  222. }

  223. 

  224. .freq-display-wrap {

  225.   display: flex;

  226.   flex-direction: column;

  227.   gap: 6px;

  228. }

  229. .freq-display-label {

  230.   font-size: 10px;

  231.   text-transform: uppercase;

  232.   letter-spacing: .08em;

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

  234. }

  235. .freq-display {

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

  237.   font-size: 40px;

  238.   color: var(--text);

  239.   letter-spacing: -0.04em;

  240.   line-height: 1;

  241.   font-weight: 800;

  242. }

  243. .freq-display .unit {

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

  245.   font-size: 14px;

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

  247.   margin-left: 5px;

  248. }

  249. 

  250. .freq-note {

  251.   display: flex;

  252.   gap: 12px;

  253.   margin-top: 6px;

  254.   font-size: 11px;

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

  256.   text-transform: uppercase;

  257.   letter-spacing: .08em;

  258. }

  259. .freq-note-item {

  260.   display: inline-flex;

  261.   align-items: center;

  262.   gap: 4px;

  263. }

  264. .freq-note.mismatch .freq-note-item {

  265.   color: var(--amber);

  266. }

  267. 

  268. .tx-actions {

  269.   display: flex;

  270.   flex-wrap: wrap;

  271.   gap: 10px;

  272. }

  273. 

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

  275.   min-height: 40px;

  276.   padding: 0 18px;

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

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

  279.   background: var(--surface2);

  280.   color: var(--text);

  281.   cursor: pointer;

  282.   font-size: 12px;

  283.   font-weight: 700;

  284.   text-transform: uppercase;

  285.   letter-spacing: .08em;

  286.   transition: all .16s ease;

  287. }

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

  289.   transform: translateY(-1px);

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

  291. }

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

  293.   opacity: .45;

  294.   cursor: not-allowed;

  295.   transform: none;

  296. }

  297. .tx-btn.start { background: var(--green); color: #fff; border-color: transparent; }

  298. .tx-btn.start:hover:not(:disabled) { background: #0b7f40; }

  299. .tx-btn.stop { background: #fff; color: var(--red); border-color: rgba(176,48,48,.35); }

  300. .tx-btn.stop:hover:not(:disabled) { background: var(--red-soft); }

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

  302. .danger-btn {

  303.   border-color: rgba(176,48,48,.35);

  304.   color: var(--red);

  305.   background: var(--red-soft);

  306. }

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

  308.   background: rgba(176,48,48,.16);

  309. }

  310. 

  311. .tx-state-wrap {

  312.   display: flex;

  313.   flex-direction: column;

  314.   align-items: flex-end;

  315.   gap: 6px;

  316. }

  317. .tx-state {

  318.   font-size: 11px;

  319.   text-transform: uppercase;

  320.   letter-spacing: 2px;

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

  322. }

  323. .tx-state.running { color: var(--green); }

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

  325. .tx-state.starting, .tx-state.stopping, .tx-state.working { color: var(--amber); }

  326. .tx-state.error { color: var(--red); }

  327. .status-hint {

  328.   font-size: 10px;

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

  330.   text-align: right;

  331. }

  332. 

  333. .quick-grid {

  334.   position: relative;

  335.   z-index: 1;

  336.   display: grid;

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

  338.   gap: 10px;

  339.   margin-top: 16px;

  340. }

  341. .quick-item {

  342.   padding: 12px;

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

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

  345.   background: var(--surface2);

  346. }

  347. .quick-item .label {

  348.   font-size: 9px;

  349.   text-transform: uppercase;

  350.   letter-spacing: .08em;

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

  352.   margin-bottom: 6px;

  353. }

  354. .quick-item .value {

  355.   font-size: 18px;

  356.   font-weight: 700;

  357.   color: var(--text);

  358. }

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

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

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

  362. 

  363. .signal-grid {

  364.   position: relative;

  365.   z-index: 1;

  366.   display: grid;

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

  368.   gap: 10px;

  369.   margin-top: 12px;

  370. }

  371. .signal-card {

  372.   padding: 12px;

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

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

  375.   background: var(--surface2);

  376. }

  377. .signal-head {

  378.   display: flex;

  379.   align-items: center;

  380.   justify-content: space-between;

  381.   gap: 10px;

  382.   margin-bottom: 8px;

  383. }

  384. .signal-title {

  385.   font-size: 10px;

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

  387.   text-transform: uppercase;

  388.   letter-spacing: .08em;

  389. }

  390. .signal-value {

  391.   font-size: 11px;

  392.   color: var(--text);

  393.   font-weight: 700;

  394. }

  395. .meter {

  396.   width: 100%;

  397.   height: 10px;

  398.   border-radius: 999px;

  399.   background: #e7ebf0;

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

  401.   overflow: hidden;

  402. }

  403. .meter-fill {

  404.   height: 100%;

  405.   width: 0%;

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

  407.   background: linear-gradient(90deg, var(--green), #3dbd75);

  408. }

  409. .meter-fill.warn {

  410.   background: linear-gradient(90deg, var(--amber), #d9a14a);

  411. }

  412. .meter-fill.err {

  413.   background: linear-gradient(90deg, var(--red), #d85c5c);

  414. }

  415. .spark {

  416.   width: 100%;

  417.   height: 34px;

  418.   margin-top: 10px;

  419.   border-radius: 6px;

  420.   background: #f7f9fb;

  421.   border: 1px solid #e3e8ee;

  422. }

  423. .spark path.line {

  424.   fill: none;

  425.   stroke-width: 2;

  426.   stroke-linecap: round;

  427.   stroke-linejoin: round;

  428. }

  429. .spark path.area {

  430.   opacity: .14;

  431. }

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

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

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

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

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

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

  438. 

  439. .panel {

  440.   overflow: hidden;

  441. }

  442. .panel-head {

  443.   display: flex;

  444.   align-items: center;

  445.   gap: 8px;

  446.   padding: 12px 14px;

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

  448.   background: var(--surface2);

  449.   cursor: pointer;

  450.   user-select: none;

  451. }

  452. .panel-head h2 {

  453.   font-size: 11px;

  454.   font-weight: 700;

  455.   text-transform: uppercase;

  456.   letter-spacing: 1.6px;

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

  458. }

  459. .panel-head .meta {

  460.   margin-left: auto;

  461.   margin-right: 8px;

  462.   font-size: 10px;

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

  464.   text-transform: uppercase;

  465.   letter-spacing: 1px;

  466. }

  467. .panel-head .chevron {

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

  469.   transition: transform .2s ease;

  470.   font-size: 10px;

  471. }

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

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

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

  475. 

  476. .section-note {

  477.   font-size: 11px;

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

  479.   margin-bottom: 12px;

  480. }

  481. .shortcuts-grid {

  482.   display: grid;

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

  484.   gap: 8px 12px;

  485. }

  486. .shortcut-line {

  487.   display: flex;

  488.   align-items: center;

  489.   justify-content: space-between;

  490.   gap: 12px;

  491.   padding: 7px 0;

  492.   border-bottom: 1px solid #e6eaef;

  493. }

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

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

  496. .shortcut-line .keys {

  497.   display: inline-flex;

  498.   gap: 6px;

  499.   flex-wrap: wrap;

  500. }

  501. .kbd {

  502.   min-width: 28px;

  503.   padding: 3px 7px;

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

  505.   border-bottom-width: 2px;

  506.   border-radius: 6px;

  507.   background: var(--surface2);

  508.   font-size: 10px;

  509.   color: var(--text);

  510.   text-align: center;

  511. }

  512. 

  513. .preset-row {

  514.   display: flex;

  515.   flex-wrap: wrap;

  516.   gap: 8px;

  517.   margin-bottom: 12px;

  518. }

  519. .preset-btn {

  520.   min-height: 34px;

  521.   padding: 0 12px;

  522.   font-size: 11px;

  523.   letter-spacing: .08em;

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

  525. }

  526. .preset-btn.active {

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

  528.   color: var(--accent);

  529.   background: var(--accent-soft);

  530. }

  531. .preset-btn.rds {

  532.   text-transform: none;

  533.   font-weight: 600;

  534. }

  535. 

  536. .ctrl-row {

  537.   display: flex;

  538.   align-items: center;

  539.   gap: 12px;

  540.   padding: 10px 0;

  541.   border-bottom: 1px solid #e6eaef;

  542. }

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

  544. .ctrl-label-wrap {

  545.   min-width: 130px;

  546.   display: flex;

  547.   flex-direction: column;

  548.   gap: 2px;

  549. }

  550. .ctrl-label {

  551.   font-size: 11px;

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

  553.   text-transform: uppercase;

  554.   letter-spacing: .8px;

  555. }

  556. .ctrl-sub {

  557.   font-size: 10px;

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

  559. }

  560. .ctrl-input {

  561.   flex: 1;

  562.   display: flex;

  563.   align-items: center;

  564.   gap: 10px;

  565. }

  566. 

  567. input[type="range"] {

  568.   -webkit-appearance: none;

  569.   appearance: none;

  570.   flex: 1;

  571.   height: 6px;

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

  573.   border-radius: 999px;

  574.   outline: none;

  575. }

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

  577.   -webkit-appearance: none;

  578.   width: 16px;

  579.   height: 16px;

  580.   border-radius: 50%;

  581.   background: var(--text);

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

  583.   cursor: pointer;

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

  585. }

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

  587.   background: var(--accent);

  588.   transform: scale(1.06);

  589. }

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

  591.   background: #fff;

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

  593.   border-radius: 6px;

  594.   color: var(--text);

  595.   padding: 8px 10px;

  596.   outline: none;

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

  598. }

  599. input[type="number"] {

  600.   width: 92px;

  601.   text-align: right;

  602. }

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

  604. input:focus {

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

  606.   box-shadow: 0 0 0 3px rgba(31,77,157,.12);

  607. }

  608. input.input-dirty {

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

  610.   box-shadow: 0 0 0 3px rgba(183,121,31,.08);

  611. }

  612. input.input-error {

  613.   border-color: var(--red);

  614.   box-shadow: 0 0 0 3px rgba(176,48,48,.14);

  615.   background: rgba(176,48,48,.04);

  616. }

  617. .val-display {

  618.   min-width: 64px;

  619.   text-align: right;

  620.   font-size: 12px;

  621.   font-weight: 700;

  622.   color: var(--text);

  623. }

  624. .unit-label {

  625.   font-size: 11px;

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

  627.   min-width: 44px;

  628. }

  629. .field-error {

  630.   display: none;

  631.   margin-top: 8px;

  632.   font-size: 11px;

  633.   color: var(--accent);

  634. }

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

  636. 

  637. .toggle-row {

  638.   display: flex;

  639.   align-items: center;

  640.   justify-content: space-between;

  641.   gap: 14px;

  642.   padding: 12px 0;

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

  644. }

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

  646. .toggle-copy {

  647.   display: flex;

  648.   flex-direction: column;

  649.   gap: 3px;

  650. }

  651. .toggle-copy .title {

  652.   font-size: 12px;

  653.   color: var(--text);

  654.   font-weight: 700;

  655. }

  656. .toggle-copy .sub {

  657.   font-size: 10px;

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

  659. }

  660. .toggle-ctl {

  661.   display: flex;

  662.   align-items: center;

  663.   gap: 10px;

  664. }

  665. .toggle {

  666.   position: relative;

  667.   width: 42px;

  668.   height: 24px;

  669.   background: var(--border);

  670.   border-radius: 999px;

  671.   cursor: pointer;

  672.   transition: all .2s ease;

  673.   flex-shrink: 0;

  674. }

  675. .toggle::after {

  676.   content: '';

  677.   position: absolute;

  678.   top: 3px;

  679.   left: 3px;

  680.   width: 18px;

  681.   height: 18px;

  682.   background: var(--text);

  683.   border-radius: 50%;

  684.   transition: transform .2s ease;

  685. }

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

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

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

  689. .toggle-state {

  690.   min-width: 52px;

  691.   text-align: right;

  692.   font-size: 11px;

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

  694.   text-transform: uppercase;

  695.   letter-spacing: 1px;

  696. }

  697. 

  698. .rds-grid {

  699.   display: grid;

  700.   gap: 12px;

  701. }

  702. .rds-field {

  703.   display: flex;

  704.   flex-direction: column;

  705.   gap: 6px;

  706. }

  707. .rds-input {

  708.   width: 100%;

  709.   background: #fff;

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

  711.   border-radius: 6px;

  712.   color: var(--accent);

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

  714.   font-size: 15px;

  715.   font-weight: 700;

  716.   padding: 10px 12px;

  717.   outline: none;

  718.   letter-spacing: 2px;

  719.   text-transform: uppercase;

  720. }

  721. .rds-input.rt {

  722.   color: var(--text);

  723.   text-transform: none;

  724.   letter-spacing: .5px;

  725.   font-size: 12px;

  726.   font-weight: 500;

  727. }

  728. .rds-charcount {

  729.   font-size: 10px;

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

  731.   text-align: right;

  732. }

  733. 

  734. .actions-row {

  735.   display: flex;

  736.   gap: 10px;

  737.   flex-wrap: wrap;

  738.   margin-top: 14px;

  739. }

  740. .apply-btn {

  741.   background: var(--accent);

  742.   border-color: transparent;

  743.   color: #fff;

  744. }

  745. .apply-btn.secondary {

  746.   background: var(--surface2);

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

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

  749. }

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

  751. 

  752. .sidebar-card {

  753.   padding: 14px;

  754. }

  755. .sidebar-section + .sidebar-section {

  756.   margin-top: 14px;

  757.   padding-top: 14px;

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

  759. }

  760. .sidebar-title {

  761.   font-size: 11px;

  762.   text-transform: uppercase;

  763.   letter-spacing: .08em;

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

  765.   margin-bottom: 10px;

  766. }

  767. .kv {

  768.   display: grid;

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

  770.   gap: 8px 12px;

  771.   align-items: start;

  772. }

  773. .kv .k {

  774.   font-size: 10px;

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

  776.   text-transform: uppercase;

  777.   letter-spacing: .08em;

  778. }

  779. .kv .v {

  780.   font-size: 12px;

  781.   color: var(--text);

  782.   word-break: break-word;

  783. }

  784. .health-line {

  785.   display: flex;

  786.   align-items: center;

  787.   justify-content: space-between;

  788.   gap: 10px;

  789.   padding: 8px 0;

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

  791. }

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

  793. .health-line .name {

  794.   font-size: 11px;

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

  796. }

  797. .health-line .val {

  798.   font-size: 11px;

  799.   color: var(--text);

  800.   text-align: right;

  801. }

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

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

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

  805. .health-trend {

  806.   margin-top: 10px;

  807. }

  808. .health-trend-label {

  809.   font-size: 10px;

  810.   text-transform: uppercase;

  811.   letter-spacing: .08em;

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

  813.   margin-bottom: 6px;

  814. }

  815. 

  816. .fault-history {

  817.   margin-top: 12px;

  818.   padding: 10px;

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

  820.   border-radius: 6px;

  821.   background: #fbfcfd;

  822.   font-size: 11px;

  823.   max-height: 180px;

  824.   overflow-y: auto;

  825.   line-height: 1.3;

  826. }

  827. .fault-history-entry {

  828.   display: flex;

  829.   justify-content: space-between;

  830.   gap: 10px;

  831.   padding: 4px 0;

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

  833. }

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

  835.   border-bottom: none;

  836. }

  837. .fault-history-entry .fault-history-time {

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

  839. }

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

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

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

  843. .fault-history-desc {

  844.   font-size: 10px;

  845.   flex: 1;

  846.   text-transform: uppercase;

  847.   letter-spacing: 0.5px;

  848. }

  849. .fault-history-empty {

  850.   padding: 6px 0;

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

  852.   font-size: 11px;

  853. }

  854. .transition-history {

  855.   margin-top: 12px;

  856.   padding: 10px;

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

  858.   border-radius: 6px;

  859.   background: var(--surface);

  860.   font-size: 11px;

  861.   max-height: 180px;

  862.   overflow-y: auto;

  863.   line-height: 1.3;

  864. }

  865. .transition-history-entry {

  866.   display: flex;

  867.   justify-content: space-between;

  868.   gap: 10px;

  869.   padding: 4px 0;

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

  871. }

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

  873.   border-bottom: none;

  874. }

  875. .transition-history-entry .transition-history-time {

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

  877. }

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

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

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

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

  882. .transition-history-desc {

  883.   font-size: 10px;

  884.   flex: 1;

  885.   text-transform: uppercase;

  886.   letter-spacing: 0.5px;

  887. }

  888. .transition-history-empty {

  889.   padding: 6px 0;

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

  891.   font-size: 11px;

  892. }

  893. .section-note.reset-hint {

  894.   font-size: 11px;

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

  896.   margin-top: 10px;

  897. }

  898. 

  899. .log {

  900.   background: #fbfcfd;

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

  902.   border-radius: 6px;

  903.   padding: 10px;

  904.   font-size: 11px;

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

  906.   max-height: 220px;

  907.   overflow-y: auto;

  908.   white-space: pre-wrap;

  909.   word-break: break-word;

  910. }

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

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

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

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

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

  916. .empty-log {

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

  918. }

  919. 

  920. .toast {

  921.   position: fixed;

  922.   right: 16px;

  923.   bottom: 16px;

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

  925.   padding: 12px 15px;

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

  927.   font-size: 12px;

  928.   font-weight: 700;

  929.   z-index: 2000;

  930.   transform: translateY(60px);

  931.   opacity: 0;

  932.   transition: all .25s ease;

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

  934. }

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

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

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

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

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

  940. 

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

  942.   .tab-columns.two {

  943.     grid-template-columns: 1fr;

  944.   }

  945.   .tab-bar {

  946.     margin: 0 -12px 18px;

  947.   }

  948.   .tx-bar {

  949.     grid-template-columns: 1fr;

  950.     align-items: stretch;

  951.   }

  952.   .tx-state-wrap {

  953.     align-items: flex-start;

  954.   }

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

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

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

  958. }

  959. 

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

  961.   .tab-columns.two {

  962.     grid-template-columns: 1fr;

  963.   }

  964.   .tab-bar {

  965.     margin: 0 -12px 14px;

  966.   }

  967.   .app { padding: 12px; }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  986. }

  987. </style>

  988. </head>

  989. <body>

  990. <div class="app">

  991.   <div class="header">

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

  993.       <h1>FM-RDS-TX Control Plane</h1>

  994.       <div class="header-note">Overview first, controls second, diagnostics when needed.</div>

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

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

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

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

  999.       </div>

  1000.     </div>

  1001.     <div class="header-status">

  1002.       <div class="led" id="led-conn"></div>

  1003.       <div class="status-text" id="conn-label">connecting</div>

  1004.     </div>

  1005.   </div>

  1006. 

  1007. 

  1008.   <div class="tab-bar">

  1009.     <button class="tab-btn active" data-tab="overview" type="button">Overview</button>

  1010.     <button class="tab-btn" data-tab="control" type="button">Transmission Control</button>

  1011.     <button class="tab-btn" data-tab="diagnostics" type="button">Diagnostics &amp; Health</button>

  1012.     <button class="tab-btn" data-tab="activity" type="button">Activity &amp; Logs</button>

  1013.   </div>

  1014. 

  1015.   <div class="tab-panels">

  1016.     <section class="tab-panel active" data-tab-panel="overview">

  1017.       <div class="tab-columns two">

  1018.         <div class="stack">

  1019.       <div class="card hero" id="hero-card">

  1020.         <div class="tx-bar">

  1021.           <div class="freq-display-wrap">

  1022.             <div class="freq-display-label">Carrier</div>

  1023.             <div class="freq-display" id="freq-display">---.-<span class="unit">MHz</span></div>

  1024.             <div class="freq-note" id="freq-note">

  1025.               <span class="freq-note-item" id="freq-applied">Applied: --</span>

  1026.               <span class="freq-note-item" id="freq-desired">Desired: --</span>

  1027.             </div>

  1028.           </div>

  1029. 

  1030.           <div class="tx-actions">

  1031.             <button class="tx-btn start" id="btn-start" type="button">TX ON</button>

  1032.             <button class="tx-btn stop" id="btn-stop" type="button">TX OFF</button>

  1033.             <button class="ghost-btn" id="btn-refresh" type="button">Refresh</button>

  1034.           </div>

  1035. 

  1036.           <div class="tx-state-wrap">

  1037.             <div class="tx-state idle" id="tx-state">IDLE</div>

  1038.             <div class="status-hint" id="tx-hint">Awaiting runtime data</div>

  1039.           </div>

  1040.         </div>

  1041. 

  1042.         <div class="quick-grid">

  1043.           <div class="quick-item">

  1044.             <div class="label">Chunks</div>

  1045.             <div class="value" id="t-chunks">--</div>

  1046.           </div>

  1047.           <div class="quick-item">

  1048.             <div class="label">Samples</div>

  1049.             <div class="value" id="t-samples">--</div>

  1050.           </div>

  1051.           <div class="quick-item">

  1052.             <div class="label">Underruns</div>

  1053.             <div class="value" id="t-underruns">--</div>

  1054.           </div>

  1055.           <div class="quick-item">

  1056.             <div class="label">Uptime</div>

  1057.             <div class="value" id="t-uptime">--</div>

  1058.           </div>

  1059.           <div class="quick-item">

  1060.             <div class="label">Rate</div>

  1061.             <div class="value" id="t-rate">--</div>

  1062.           </div>

  1063.         </div>

  1064. 

  1065.         <div class="signal-grid">

  1066.           <div class="signal-card">

  1067.             <div class="signal-head">

  1068.               <div class="signal-title">Audio Buffer</div>

  1069.               <div class="signal-value" id="meter-audio-text">--</div>

  1070.             </div>

  1071.             <div class="meter"><div class="meter-fill" id="meter-audio-fill"></div></div>

  1072.             <svg class="spark good" id="spark-audio" viewBox="0 0 160 34" preserveAspectRatio="none"></svg>

  1073.           </div>

  1074.           <div class="signal-card">

  1075.             <div class="signal-head">

  1076.               <div class="signal-title">Stream Health</div>

  1077.               <div class="signal-value" id="meter-stream-text">--</div>

  1078.             </div>

  1079.             <div class="meter"><div class="meter-fill" id="meter-stream-fill"></div></div>

  1080.             <svg class="spark warn" id="spark-underruns" viewBox="0 0 160 34" preserveAspectRatio="none"></svg>

  1081.           </div>

  1082.           <div class="signal-card">

  1083.             <div class="signal-head">

  1084.               <div class="signal-title">TX Activity</div>

  1085.               <div class="signal-value" id="meter-tx-text">--</div>

  1086.             </div>

  1087.             <div class="meter"><div class="meter-fill" id="meter-tx-fill"></div></div>

  1088.             <svg class="spark good" id="spark-tx" viewBox="0 0 160 34" preserveAspectRatio="none"></svg>

  1089.           </div>

  1090.         </div>

  1091.       </div>

  1092. 

  1093. 

  1094.         </div>

  1095.         <div class="stack">

  1096.           <div class="card sidebar-card">

  1097.         <div class="sidebar-section">

  1098.           <div class="sidebar-title">Runtime Snapshot</div>

  1099.           <div class="kv">

  1100.             <div class="k">Backend</div><div class="v" id="info-backend">--</div>

  1101.             <div class="k">Frequency</div><div class="v" id="info-freq">--</div>

  1102.             <div class="k">Runtime Age</div><div class="v" id="info-runtime-age">--</div>

  1103.             <div class="k">Last Alert</div><div class="v" id="info-last-alert">--</div>

  1104.             <div class="k">Live Config</div><div class="v" id="info-live">--</div>

  1105.           </div>

  1106.         </div>

  1107. 

  1108.         <div class="sidebar-section">

  1109.           <div class="sidebar-title">Signal Notes</div>

  1110.           <div class="section-note">Overview stays compact: primary state here, deep diagnostics in the dedicated tab.</div>

  1111.           <div class="kv">

  1112.             <div class="k">Pre-emphasis</div><div class="v" id="info-preemph">--</div>

  1113.             <div class="k">FM Mod</div><div class="v" id="info-fmmod">--</div>

  1114.           </div>

  1115.         </div>

  1116. 

  1117.           </div>

  1118.         </div>

  1119.       </div>

  1120.     </section>

  1121. 

  1122.     <section class="tab-panel" data-tab-panel="control">

  1123.       <div class="tab-columns two">

  1124.         <div class="stack">

  1125.       <div class="card panel" data-panel-key="frequency">

  1126.         <div class="panel-head" data-panel>

  1127.           <div class="led on-green" style="width:6px;height:6px"></div>

  1128.           <h2>Frequency</h2>

  1129.           <div class="meta" id="freq-meta">Live-tunable</div>

  1130.           <span class="chevron">▼</span>

  1131.         </div>

  1132.         <div class="panel-body">

  1133.           <div class="section-note">Tune the RF carrier without restarting the control plane. Draft values stay local until you apply them.</div>

  1134. 

  1135.           <div class="preset-row" id="freq-presets">

  1136.             <button class="preset-btn" type="button" data-freq-preset="87.6">87.6 MHz</button>

  1137.             <button class="preset-btn" type="button" data-freq-preset="94.5">94.5 MHz</button>

  1138.             <button class="preset-btn" type="button" data-freq-preset="99.5">99.5 MHz</button>

  1139.             <button class="preset-btn" type="button" data-freq-preset="100.0">100.0 MHz</button>

  1140.             <button class="preset-btn" type="button" data-freq-preset="107.9">107.9 MHz</button>

  1141.           </div>

  1142. 

  1143.           <div class="ctrl-row">

  1144.             <div class="ctrl-label-wrap">

  1145.               <span class="ctrl-label">TX Freq</span>

  1146.               <span class="ctrl-sub">Valid range 65–110 MHz</span>

  1147.             </div>

  1148.             <div class="ctrl-input">

  1149.               <input type="range" min="65" max="110" step="0.1" id="freq-slider">

  1150.               <input type="number" min="65" max="110" step="0.1" id="freq-num">

  1151.               <span class="unit-label">MHz</span>

  1152.             </div>

  1153.           </div>

  1154.           <div class="field-error" id="freq-error"></div>

  1155.           <div class="actions-row">

  1156.             <button class="apply-btn" id="freq-apply" type="button">Apply Frequency</button>

  1157.             <button class="apply-btn secondary" id="freq-reset" type="button">Reset</button>

  1158.           </div>

  1159.         </div>

  1160.       </div>

  1161. 

  1162. 

  1163.       <div class="card panel" data-panel-key="switches">

  1164.         <div class="panel-head" data-panel>

  1165.           <div class="led on-green" style="width:6px;height:6px"></div>

  1166.           <h2>Switches</h2>

  1167.           <div class="meta">Live</div>

  1168.           <span class="chevron">▼</span>

  1169.         </div>

  1170.         <div class="panel-body">

  1171.           <div class="section-note">These switches apply immediately and show a busy state while the request is in flight.</div>

  1172. 

  1173.           <div class="toggle-row">

  1174.             <div class="toggle-copy">

  1175.               <div class="title">Stereo</div>

  1176.               <div class="sub">19 kHz pilot + 38 kHz DSB-SC</div>

  1177.             </div>

  1178.             <div class="toggle-ctl">

  1179.               <div class="toggle" id="tog-stereo" data-toggle="stereoEnabled" role="switch" aria-checked="false" tabindex="0"></div>

  1180.               <div class="toggle-state" id="stereo-label">--</div>

  1181.             </div>

  1182.           </div>

  1183. 

  1184.           <div class="toggle-row">

  1185.             <div class="toggle-copy">

  1186.               <div class="title">RDS</div>

  1187.               <div class="sub">57 kHz subcarrier encoder</div>

  1188.             </div>

  1189.             <div class="toggle-ctl">

  1190.               <div class="toggle" id="tog-rds" data-toggle="rdsEnabled" role="switch" aria-checked="false" tabindex="0"></div>

  1191.               <div class="toggle-state" id="rds-label">--</div>

  1192.             </div>

  1193.           </div>

  1194. 

  1195.           <div class="toggle-row">

  1196.             <div class="toggle-copy">

  1197.               <div class="title">Limiter</div>

  1198.               <div class="sub">MPX peak protection</div>

  1199.             </div>

  1200.             <div class="toggle-ctl">

  1201.               <div class="toggle" id="tog-limiter" data-toggle="limiterEnabled" role="switch" aria-checked="false" tabindex="0"></div>

  1202.               <div class="toggle-state" id="limiter-label">--</div>

  1203.             </div>

  1204.           </div>

  1205.         </div>

  1206.       </div>

  1207. 

  1208. 

  1209.       <div class="card panel" data-panel-key="rds">

  1210.         <div class="panel-head" data-panel>

  1211.           <div class="led on-amber" style="width:6px;height:6px"></div>

  1212.           <h2>RDS Text</h2>

  1213.           <div class="meta" id="rds-meta">PS + RT</div>

  1214.           <span class="chevron">▼</span>

  1215.         </div>

  1216.         <div class="panel-body">

  1217.           <div class="section-note">Edit Program Service and RadioText without losing in-progress typing when the page refreshes itself.</div>

  1218. 

  1219.           <div class="preset-row" id="rds-presets">

  1220.             <button class="preset-btn rds" type="button" data-rds-ps="FMRTX" data-rds-rt="fm-rds-tx live">Station ID</button>

  1221.             <button class="preset-btn rds" type="button" data-rds-ps="ONAIR" data-rds-rt="Now broadcasting">On Air</button>

  1222.             <button class="preset-btn rds" type="button" data-rds-ps="LIVE" data-rds-rt="Live set in progress">Live Set</button>

  1223.             <button class="preset-btn rds" type="button" data-rds-ps="TEST" data-rds-rt="RDS test transmission">Test</button>

  1224.           </div>

  1225. 

  1226.           <div class="rds-grid">

  1227.             <div class="rds-field">

  1228.               <span class="ctrl-label">Program Service (PS)</span>

  1229.               <input type="text" class="rds-input" id="rds-ps" maxlength="8" placeholder="STATION" spellcheck="false">

  1230.               <div class="rds-charcount"><span id="ps-count">0</span>/8</div>

  1231.               <div class="field-error" id="ps-error"></div>

  1232.             </div>

  1233.             <div class="rds-field">

  1234.               <span class="ctrl-label">RadioText (RT)</span>

  1235.               <input type="text" class="rds-input rt" id="rds-rt" maxlength="64" placeholder="Now playing..." spellcheck="false">

  1236.               <div class="rds-charcount"><span id="rt-count">0</span>/64</div>

  1237.               <div class="field-error" id="rt-error"></div>

  1238.             </div>

  1239.           </div>

  1240.           <div class="actions-row">

  1241.             <button class="apply-btn" id="rds-apply" type="button">Apply RDS Text</button>

  1242.             <button class="apply-btn secondary" id="rds-reset" type="button">Reset</button>

  1243.           </div>

  1244.         </div>

  1245.       </div>

  1246. 

  1247.         </div>

  1248.         <div class="stack">

  1249.       <div class="card panel" data-panel-key="shortcuts">

  1250.         <div class="panel-head" data-panel>

  1251.           <h2>Shortcuts</h2>

  1252.           <div class="meta">keyboard</div>

  1253.           <span class="chevron">▼</span>

  1254.         </div>

  1255.         <div class="panel-body">

  1256.           <div class="section-note">Fast control reference. Shortcuts stay out of the main operator path.</div>

  1257.           <div class="shortcuts-grid">

  1258.             <div>

  1259.               <div class="shortcut-line"><span class="name">Start TX</span><span class="keys"><span class="kbd">t</span></span></div>

  1260.               <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>

  1261.               <div class="shortcut-line"><span class="name">Refresh</span><span class="keys"><span class="kbd">r</span></span></div>

  1262.             </div>

  1263.             <div>

  1264.               <div class="shortcut-line"><span class="name">Next Freq Preset</span><span class="keys"><span class="kbd">]</span></span></div>

  1265.               <div class="shortcut-line"><span class="name">Prev Freq Preset</span><span class="keys"><span class="kbd">[</span></span></div>

  1266.               <div class="shortcut-line"><span class="name">Apply Draft</span><span class="keys"><span class="kbd">Enter</span></span></div>

  1267.             </div>

  1268.           </div>

  1269.         </div>

  1270.       </div>

  1271. 

  1272. 

  1273.       <div class="card panel" data-panel-key="danger">

  1274.         <div class="panel-head" data-panel>

  1275.           <h2>Danger Zone</h2>

  1276.           <div class="meta">tx control</div>

  1277.           <span class="chevron">▼</span>

  1278.         </div>

  1279.         <div class="panel-body">

  1280.           <div class="section-note">Fast emergency controls. Nothing hidden here — just clearer separation from normal controls.</div>

  1281.           <div class="actions-row" style="margin-top:0">

  1282.             <button class="danger-btn" id="danger-stop" type="button">Emergency Stop TX</button>

  1283.             <button class="danger-btn" id="danger-refresh" type="button">Hard Refresh Runtime</button>

  1284.             <button class="danger-btn secondary" id="danger-reset-fault" type="button">Reset Fault</button>

  1285. 

  1286.           </div>

  1287.           <div class="section-note reset-hint" id="reset-hint">

  1288.             Reset Fault moves the runtime back to DEGRADED while the queue settles before running again.

  1289.           </div>

  1290.         </div>

  1291.       </div>

  1292. 

  1293. 

  1294.         </div>

  1295.       </div>

  1296.     </section>

  1297. 

  1298.     <section class="tab-panel" data-tab-panel="diagnostics">

  1299.       <div class="tab-columns two">

  1300.         <div class="stack">

  1301.           <div class="card sidebar-card">

  1302.         <div class="sidebar-section">

  1303.           <div class="sidebar-title">Health</div>

  1304.           <div class="health-line"><div class="name">HTTP</div><div class="val" id="health-http">--</div></div>

  1305.           <div class="health-line"><div class="name">Runtime</div><div class="val" id="health-runtime">--</div></div>

  1306.           <div class="health-line"><div class="name">State Age</div><div class="val" id="health-state-age">--</div></div>

  1307.           <div class="health-line"><div class="name">Runtime Signal</div><div class="val" id="health-indicator">--</div></div>

  1308.           <div class="health-line"><div class="name">Runtime Alert</div><div class="val" id="health-alert">--</div></div>

  1309.           <div class="health-line"><div class="name">Transitions (D/M/F)</div><div class="val" id="health-transitions">--</div></div>

  1310.           <div class="health-line"><div class="name">Fault Count</div><div class="val" id="health-fault-count">--</div></div>

  1311.           <div class="health-line"><div class="name">Last Fault</div><div class="val" id="health-last-fault">--</div></div>

  1312.           <div class="health-line"><div class="name">Audio Buffer</div><div class="val" id="health-audio">--</div></div>

  1313.           <div class="health-line"><div class="name">Buffer Duration</div><div class="val" id="health-buffer-duration">--</div></div>

  1314.           <div class="health-line"><div class="name">High Watermark</div><div class="val" id="health-buffer-highwater">--</div></div>

  1315.           <div class="health-line"><div class="name">Queue Fill</div><div class="val" id="health-queue-fill">--</div></div>

  1316.           <div class="health-line"><div class="name">Underrun Streak</div><div class="val" id="health-underrun-streak">--</div></div>

  1317.           <div class="health-line"><div class="name">Last Update</div><div class="val" id="health-last">--</div></div>

  1318.           <div class="health-trend">

  1319.             <div class="health-trend-label">High Watermark Trend</div>

  1320.             <svg class="spark warn" id="spark-high-watermark" viewBox="0 0 160 34" preserveAspectRatio="none"></svg>

  1321.           </div>

  1322.           <div class="health-trend">

  1323.             <div class="health-trend-label">Queue Fill Trend</div>

  1324.             <svg class="spark good" id="spark-queue-fill" viewBox="0 0 160 34" preserveAspectRatio="none"></svg>

  1325.           </div>

  1326.         </div>

  1327.           </div>

  1328.           <div class="card sidebar-card">

  1329.         <div class="sidebar-section">

  1330.           <div class="sidebar-title">Control Audit</div>

  1331.           <div class="section-note">Counts of 4xx rejects recorded by the control plane APIs.</div>

  1332.           <div class="kv">

  1333.             <div class="k">Rejects total</div><div class="v" id="audit-total">--</div>

  1334.             <div class="k">405 Method Not Allowed</div><div class="v" id="audit-methodNotAllowed">--</div>

  1335.             <div class="k">415 Unsupported Media Type</div><div class="v" id="audit-unsupportedMediaType">--</div>

  1336.             <div class="k">413 Request Too Large</div><div class="v" id="audit-bodyTooLarge">--</div>

  1337.             <div class="k">400 Unexpected Body</div><div class="v" id="audit-unexpectedBody">--</div>

  1338.           </div>

  1339.         </div>

  1340. 

  1341. 

  1342.           </div>

  1343.         </div>

  1344.         <div class="stack">

  1345.       <div class="card panel" data-panel-key="transition-history">

  1346.         <div class="panel-head" data-panel>

  1347.           <h2>Transition History</h2>

  1348.           <div class="meta">recent state shifts</div>

  1349.           <span class="chevron"></span>

  1350.         </div>

  1351.         <div class="panel-body">

  1352.           <div class="section-note">Keeps runtime escalations visible without scrolling the activity log.</div>

  1353.           <div class="transition-history" id="transition-history">

  1354.             <div class="transition-history-empty">No transitions yet.</div>

  1355.           </div>

  1356.         </div>

  1357.       </div>

  1358. 

  1359. 

  1360.       <div class="card panel" data-panel-key="fault-history">

  1361.         <div class="panel-head" data-panel>

  1362.           <h2>Fault History</h2>

  1363.           <div class="meta">recent faults</div>

  1364.           <span class="chevron">▼</span>

  1365.         </div>

  1366.         <div class="panel-body">

  1367.           <div class="section-note">Recent fault events for quick ops situational awareness.</div>

  1368.           <div class="fault-history" id="fault-history">

  1369.             <div class="fault-history-empty">No faults yet.</div>

  1370.           </div>

  1371.         </div>

  1372.       </div>

  1373. 

  1374. 

  1375.         </div>

  1376.       </div>

  1377.     </section>

  1378. 

  1379.     <section class="tab-panel" data-tab-panel="activity">

  1380.       <div class="tab-columns one">

  1381.         <div class="stack">

  1382.       <div class="card panel" data-panel-key="log">

  1383.         <div class="panel-head" data-panel>

  1384.           <h2>Activity Log</h2>

  1385.           <div class="meta" id="log-meta">recent events</div>

  1386.           <span class="chevron">▼</span>

  1387.         </div>

  1388.         <div class="panel-body">

  1389.           <div class="actions-row" style="margin-top:0;margin-bottom:12px">

  1390.             <button class="ghost-btn" id="btn-clear-log" type="button">Clear Log</button>

  1391.           </div>

  1392.           <div class="log" id="log"><div class="empty-log">No events yet.</div></div>

  1393.         </div>

  1394.       </div>

  1395.         </div>

  1396.       </div>

  1397.     </section>

  1398.   </div>

  1399. </div>

  1400. 

  1401. <div class="toast" id="toast"></div>

  1402. 

  1403. <script>

  1404. const $ = (id) => document.getElementById(id);

  1405. 

  1406. const runtimePollMs = 1000;

  1407. const configPollMs = 8000;

  1408. const mobileMq = window.matchMedia('(max-width: 640px)');

  1409. const freqPresetValues = [87.6, 94.5, 99.5, 100.0, 107.9];

  1410. const sparkHistoryLimit = 40;

  1411. const transitionHistoryLimit = 6;

  1412. 

  1413. const state = {

  1414.   server: {

  1415.     config: null,

  1416.     runtime: null,

  1417.     lastConfigAt: 0,

  1418.     lastRuntimeAt: 0,

  1419.     configOk: false,

  1420.     runtimeOk: false,

  1421.   },

  1422.   lastRuntimeState: '',

  1423.   draft: {

  1424.     frequencyMHz: undefined,

  1425.     ps: undefined,

  1426.     radioText: undefined,

  1427.   },

  1428.   errors: {

  1429.     frequencyMHz: '',

  1430.     ps: '',

  1431.     radioText: '',

  1432.   },

  1433.   dirty: new Set(),

  1434.   pendingRequests: 0,

  1435.   txBusy: false,

  1436.   faultResetBusy: false,

  1437.   toggleBusy: {},

  1438.   pollersStarted: false,

  1439.   mobilePanelsApplied: false,

  1440.   charts: {

  1441.     audio: [],

  1442.     underruns: [],

  1443.     tx: [],

  1444.     highWatermark: [],

  1445.     queueFill: [],

  1446.   },

  1447.   runtimeTransitions: [],

  1448.   freqPresetIndex: 0,

  1449. };

  1450. 

  1451. const fields = {

  1452.   frequencyMHz: { section: 'freq', equal: (a,b) => nearlyEqual(a,b,0.0001) },

  1453.   ps: { section: 'rds', equal: (a,b) => String(a ?? '') === String(b ?? '') },

  1454.   radioText: { section: 'rds', equal: (a,b) => String(a ?? '') === String(b ?? '') },

  1455. };

  1456. 

  1457. function nearlyEqual(a, b, eps = 1e-9) {

  1458.   if (a == null && b == null) return true;

  1459.   if (a == null || b == null) return false;

  1460.   return Math.abs(Number(a) - Number(b)) <= eps;

  1461. }

  1462. 

  1463. function nowTs() { return Date.now(); }

  1464. 

  1465. function serverValue(key) {

  1466.   const cfg = state.server.config;

  1467.   if (!cfg) return undefined;

  1468.   switch (key) {

  1469.     case 'frequencyMHz': return cfg.fm?.frequencyMHz;

  1470.     case 'ps': return cfg.rds?.ps ?? '';

  1471.     case 'radioText': return cfg.rds?.radioText ?? '';

  1472.     case 'stereoEnabled': return cfg.fm?.stereoEnabled;

  1473.     case 'rdsEnabled': return cfg.rds?.enabled;

  1474.     case 'limiterEnabled': return cfg.fm?.limiterEnabled;

  1475.     default: return undefined;

  1476.   }

  1477. }

  1478. 

  1479. function effectiveValue(key) {

  1480.   return state.dirty.has(key) ? state.draft[key] : serverValue(key);

  1481. }

  1482. 

  1483. function validateField(key, value) {

  1484.   switch (key) {

  1485.     case 'frequencyMHz': {

  1486.       if (value == null || Number.isNaN(Number(value))) return 'Enter a valid number.';

  1487.       const num = Number(value);

  1488.       if (num < 65 || num > 110) return 'Frequency must stay between 65 and 110 MHz.';

  1489.       return '';

  1490.     }

  1491.     case 'ps': {

  1492.       const text = String(value ?? '');

  1493.       if (text.length > 8) return 'PS is limited to 8 characters.';

  1494.       return '';

  1495.     }

  1496.     case 'radioText': {

  1497.       const text = String(value ?? '');

  1498.       if (text.length > 64) return 'RadioText is limited to 64 characters.';

  1499.       return '';

  1500.     }

  1501.     default:

  1502.       return '';

  1503.   }

  1504. }

  1505. 

  1506. function sectionHasErrors(section) {

  1507.   return Object.entries(fields).some(([key, meta]) => meta.section === section && state.errors[key]);

  1508. }

  1509. 

  1510. function setDirty(key, value) {

  1511.   state.draft[key] = value;

  1512.   state.errors[key] = validateField(key, value);

  1513.   const current = serverValue(key);

  1514.   const equal = !state.errors[key] && fields[key].equal(value, current);

  1515.   if (equal) {

  1516.     state.dirty.delete(key);

  1517.     state.draft[key] = undefined;

  1518.   } else {

  1519.     state.dirty.add(key);

  1520.   }

  1521.   if (key === 'frequencyMHz' && typeof value === 'number') syncFreqPresetIndex(value);

  1522.   render();

  1523. }

  1524. 

  1525. function clearDirty(keys) {

  1526.   for (const key of keys) {

  1527.     state.dirty.delete(key);

  1528.     state.draft[key] = undefined;

  1529.     state.errors[key] = '';

  1530.   }

  1531.   render();

  1532. }

  1533. 

  1534. function isDirtySection(section) {

  1535.   for (const key of state.dirty) {

  1536.     if (fields[key]?.section === section) return true;

  1537.   }

  1538.   return false;

  1539. }

  1540. 

  1541. function getSectionPatch(section) {

  1542.   const patch = {};

  1543.   for (const key of state.dirty) {

  1544.     if (fields[key]?.section === section && !state.errors[key]) patch[key] = state.draft[key];

  1545.   }

  1546.   return patch;

  1547. }

  1548. 

  1549. async function api(path, opts) {

  1550.   const response = await fetch(path, opts);

  1551.   const text = await response.text();

  1552.   if (!response.ok) {

  1553.     throw new Error(text.trim() || `HTTP ${response.status}`);

  1554.   }

  1555.   if (!text) return {};

  1556.   try {

  1557.     return JSON.parse(text);

  1558.   } catch {

  1559.     return { ok: true, raw: text };

  1560.   }

  1561. }

  1562. 

  1563. function setConnection(ok, mode) {

  1564.   const led = $('led-conn');

  1565.   const label = $('conn-label');

  1566.   if (ok) {

  1567.     led.className = 'led on-green';

  1568.     label.textContent = mode || 'connected';

  1569.   } else {

  1570.     led.className = 'led on-red';

  1571.     label.textContent = mode || 'offline';

  1572.   }

  1573. }

  1574. 

  1575. async function loadConfig({ silent = false } = {}) {

  1576.   try {

  1577.     const cfg = await api('/config');

  1578.     state.server.config = cfg;

  1579.     state.server.configOk = true;

  1580.     state.server.lastConfigAt = nowTs();

  1581.     syncFreqPresetIndex(cfg.fm?.frequencyMHz);

  1582.     setConnection(true, state.pendingRequests > 0 ? 'busy' : 'connected');

  1583.     render();

  1584.     if (!silent) log('Config synced from server', 'info');

  1585.     return cfg;

  1586.   } catch (error) {

  1587.     state.server.configOk = false;

  1588.     if (!state.server.runtimeOk) setConnection(false, 'offline');

  1589.     render();

  1590.     if (!silent) log('Config load failed: ' + error.message, 'err');

  1591.     throw error;

  1592.   }

  1593. }

  1594. 

  1595. async function loadRuntime({ silent = true } = {}) {

  1596.   try {

  1597.     const runtime = await api('/runtime');

  1598.     state.server.runtime = runtime;

  1599.     state.server.runtimeOk = true;

  1600.     state.server.lastRuntimeAt = nowTs();

  1601.     const syncedTransitions = syncTransitionHistoryFromEngine(runtime.engine);

  1602.     notifyRuntimeTransition(runtime.engine, !syncedTransitions);

  1603.     pushHistory(runtime);

  1604.     setConnection(true, state.pendingRequests > 0 ? 'busy' : 'connected');

  1605.     render();

  1606.     return runtime;

  1607.   } catch (error) {

  1608.     state.server.runtimeOk = false;

  1609.     if (!state.server.configOk) setConnection(false, 'offline');

  1610.     render();

  1611.     if (!silent) log('Runtime load failed: ' + error.message, 'err');

  1612.     throw error;

  1613.   }

  1614. }

  1615. 

  1616. function pushHistory(runtime) {

  1617.   const engine = runtime.engine || {};

  1618.   const driver = runtime.driver || {};

  1619.   const audio = runtime.audioStream || {};

  1620.   pushChart(state.charts.audio, typeof audio.buffered === 'number' ? audio.buffered : 0);

  1621.   const highWatermarkDurationSeconds = Number(audio.highWatermarkDurationSeconds);

  1622.   const normalizedHighWatermark = Number.isFinite(highWatermarkDurationSeconds) ? highWatermarkDurationSeconds : 0;

  1623.   pushChart(state.charts.highWatermark, normalizedHighWatermark);

  1624.   const queueFill = Number(engine.queue?.fillLevel ?? 0);

  1625.   pushChart(state.charts.queueFill, Number.isFinite(queueFill) ? queueFill : 0);

  1626.   pushChart(state.charts.underruns, Number(engine.underruns ?? driver.underruns ?? 0));

  1627.   const txState = String(engine.state || 'idle').toLowerCase();

  1628.   pushChart(state.charts.tx, txState === 'running' ? 1 : state.txBusy ? 0.55 : 0.05);

  1629. }

  1630. 

  1631. function pushTransitionHistory(from, to, severity) {

  1632.   if (!from || !to) return;

  1633.   const entry = {

  1634.     from: normalizeRuntimeState(from),

  1635.     to: normalizeRuntimeState(to),

  1636.     severity: severity || 'info',

  1637.     time: nowTs(),

  1638.   };

  1639.   state.runtimeTransitions.unshift(entry);

  1640.   if (state.runtimeTransitions.length > transitionHistoryLimit) {

  1641.     state.runtimeTransitions.splice(transitionHistoryLimit);

  1642.   }

  1643.   updateTransitionHistory();

  1644. }

  1645. 

  1646. function transitionEntryTime(value) {

  1647.   if (value == null) return nowTs();

  1648.   if (typeof value === 'number') return value;

  1649.   const parsed = Date.parse(String(value));

  1650.   return Number.isNaN(parsed) ? nowTs() : parsed;

  1651. }

  1652. 

  1653. function syncTransitionHistoryFromEngine(engine) {

  1654.   const entries = Array.isArray(engine?.transitionHistory) ? engine.transitionHistory : null;

  1655.   if (!entries) return false;

  1656.   const sliceStart = Math.max(0, entries.length - transitionHistoryLimit);

  1657.   const trimmed = entries.slice(sliceStart);

  1658.   const normalized = trimmed.map((entry) => ({

  1659.     from: normalizeRuntimeState(entry?.from),

  1660.     to: normalizeRuntimeState(entry?.to),

  1661.     severity: String(entry?.severity || 'info').toLowerCase(),

  1662.     time: transitionEntryTime(entry?.time),

  1663.   }));

  1664.   normalized.reverse();

  1665.   state.runtimeTransitions = normalized;

  1666.   updateTransitionHistory();

  1667.   return true;

  1668. }

  1669. 

  1670. function transitionSeverityClass(severity) {

  1671.   switch (String(severity || '').toLowerCase()) {

  1672.     case 'err':

  1673.       return 'err';

  1674.     case 'warn':

  1675.       return 'warn';

  1676.     case 'ok':

  1677.     case 'good':

  1678.       return 'good';

  1679.     default:

  1680.       return 'info';

  1681.   }

  1682. }

  1683. 

  1684. function updateTransitionHistory() {

  1685.   const container = $('transition-history');

  1686.   if (!container) return;

  1687.   if (!state.runtimeTransitions.length) {

  1688.     container.innerHTML = '<div class="transition-history-empty">No transitions yet.</div>';

  1689.     return;

  1690.   }

  1691.   const rows = state.runtimeTransitions.map((entry) => {

  1692.     const when = entry?.time ? new Date(entry.time) : null;

  1693.     const timeLabel = when && !Number.isNaN(when.getTime()) ? when.toLocaleTimeString() : '--:--';

  1694.     const desc = `${entry.from.toUpperCase()} → ${entry.to.toUpperCase()}`;

  1695.     const severityClass = transitionSeverityClass(entry.severity);

  1696.     return `<div class="transition-history-entry ${severityClass}"><span class="transition-history-time">${timeLabel}</span><span class="transition-history-desc">${desc}</span></div>`;

  1697.   });

  1698.   container.innerHTML = rows.join('');

  1699. }

  1700. 

  1701. function pushChart(arr, value) {

  1702.   arr.push(Number.isFinite(value) ? value : 0);

  1703.   if (arr.length > sparkHistoryLimit) arr.splice(0, arr.length - sparkHistoryLimit);

  1704. }

  1705. 

  1706. function setConnectionBusy() {

  1707.   setConnection(true, 'busy');

  1708. }

  1709. 

  1710. function beginRequest() {

  1711.   state.pendingRequests += 1;

  1712.   setConnectionBusy();

  1713.   render();

  1714. }

  1715. 

  1716. function endRequest() {

  1717.   state.pendingRequests = Math.max(0, state.pendingRequests - 1);

  1718.   if (state.server.configOk || state.server.runtimeOk) {

  1719.     setConnection(true, state.pendingRequests > 0 ? 'busy' : 'connected');

  1720.   }

  1721.   render();

  1722. }

  1723. 

  1724. async function sendPatch(patch, { successMessage = 'Applied', clearKeys = [] } = {}) {

  1725.   beginRequest();

  1726.   try {

  1727.     const result = await api('/config', {

  1728.       method: 'POST',

  1729.       headers: { 'Content-Type': 'application/json' },

  1730.       body: JSON.stringify(patch),

  1731.     });

  1732.     if (state.server.config) mergeLocalConfigPatch(patch);

  1733.     clearDirty(clearKeys);

  1734.     render();

  1735.     toast(successMessage + (result.live ? ' · live' : ''), 'ok');

  1736.     log('PATCH ' + JSON.stringify(patch) + (result.live ? ' [live]' : ' [saved]'), 'ok');

  1737.     await Promise.allSettled([

  1738.       loadConfig({ silent: true }),

  1739.       loadRuntime({ silent: true }),

  1740.     ]);

  1741.     return result;

  1742.   } catch (error) {

  1743.     toast(error.message, 'err');

  1744.     log('PATCH failed: ' + error.message, 'err');

  1745.     throw error;

  1746.   } finally {

  1747.     endRequest();

  1748.   }

  1749. }

  1750. 

  1751. function mergeLocalConfigPatch(patch) {

  1752.   const cfg = state.server.config || {};

  1753.   cfg.fm ||= {};

  1754.   cfg.rds ||= {};

  1755.   for (const [key, value] of Object.entries(patch)) {

  1756.     switch (key) {

  1757.       case 'frequencyMHz': cfg.fm.frequencyMHz = value; break;

  1758.       case 'stereoEnabled': cfg.fm.stereoEnabled = value; break;

  1759.       case 'limiterEnabled': cfg.fm.limiterEnabled = value; break;

  1760.       case 'rdsEnabled': cfg.rds.enabled = value; break;

  1761.       case 'ps': cfg.rds.ps = value; break;

  1762.       case 'radioText': cfg.rds.radioText = value; break;

  1763.     }

  1764.   }

  1765. }

  1766. 

  1767. async function applySection(section) {

  1768.   if (sectionHasErrors(section)) {

  1769.     toast('Fix the highlighted fields first', 'warn');

  1770.     log(section.toUpperCase() + ' apply blocked by validation errors', 'warn');

  1771.     render();

  1772.     return;

  1773.   }

  1774.   const patch = getSectionPatch(section);

  1775.   const keys = Object.keys(patch);

  1776.   if (!keys.length) {

  1777.     toast('No changes to apply', 'info');

  1778.     return;

  1779.   }

  1780.   let message = 'Applied';

  1781.   if (section === 'freq') message = 'Frequency updated';

  1782.   if (section === 'rds') message = 'RDS text updated';

  1783.   await sendPatch(patch, { successMessage: message, clearKeys: keys });

  1784. }

  1785. 

  1786. function resetSection(section) {

  1787.   const keys = Object.keys(fields).filter((key) => fields[key].section === section);

  1788.   clearDirty(keys);

  1789.   log(section.toUpperCase() + ' draft reset', 'warn');

  1790.   toast('Draft reset', 'info');

  1791. }

  1792. 

  1793. async function setToggle(key, nextValue) {

  1794.   if (state.toggleBusy[key]) return;

  1795.   state.toggleBusy[key] = true;

  1796.   render();

  1797.   try {

  1798.     await sendPatch({ [key]: nextValue }, {

  1799.       successMessage: key.replace(/Enabled$/, '') + ' ' + (nextValue ? 'enabled' : 'disabled'),

  1800.       clearKeys: [],

  1801.     });

  1802.   } finally {

  1803.     state.toggleBusy[key] = false;

  1804.     render();

  1805.   }

  1806. }

  1807. 

  1808. async function txAction(action) {

  1809.   if (state.txBusy) return;

  1810.   state.txBusy = true;

  1811.   render();

  1812.   beginRequest();

  1813.   try {

  1814.     await api(`/tx/${action}`, { method: 'POST' });

  1815.     toast(action === 'start' ? 'TX started' : 'TX stopped', 'ok');

  1816.     log('TX ' + action + ' request accepted', 'ok');

  1817.     await Promise.allSettled([

  1818.       loadRuntime({ silent: true }),

  1819.       loadConfig({ silent: true }),

  1820.     ]);

  1821.   } catch (error) {

  1822.     toast(error.message, 'err');

  1823.     log('TX ' + action + ' failed: ' + error.message, 'err');

  1824.   } finally {

  1825.     state.txBusy = false;

  1826.     endRequest();

  1827.     render();

  1828.   }

  1829. }

  1830. 

  1831. async function resetFaultAction() {

  1832.   if (state.faultResetBusy) return;

  1833.   state.faultResetBusy = true;

  1834.   render();

  1835.   beginRequest();

  1836.   try {

  1837.     await api('/runtime/fault/reset', { method: 'POST' });

  1838.     toast('Fault reset', 'ok');

  1839.     log('Fault reset request accepted', 'ok');

  1840.     await loadRuntime({ silent: true });

  1841.   } catch (error) {

  1842.     toast(error.message, 'err');

  1843.     log('Fault reset failed: ' + error.message, 'err');

  1844.   } finally {

  1845.     state.faultResetBusy = false;

  1846.     endRequest();

  1847.     render();

  1848.   }

  1849. }

  1850. 

  1851. function fmt(n) {

  1852.   if (n == null) return '--';

  1853.   if (n >= 1e9) return (n / 1e9).toFixed(2) + 'G';

  1854.   if (n >= 1e6) return (n / 1e6).toFixed(2) + 'M';

  1855.   if (n >= 1e3) return (n / 1e3).toFixed(1) + 'k';

  1856.   return String(n);

  1857. }

  1858. 

  1859. function fmtTime(seconds) {

  1860.   if (!seconds || seconds <= 0) return '--';

  1861.   const h = Math.floor(seconds / 3600);

  1862.   const m = Math.floor((seconds % 3600) / 60);

  1863.   const s = Math.floor(seconds % 60);

  1864.   if (h > 0) return `${h}h ${m}m`;

  1865.   if (m > 0) return `${m}m ${s}s`;

  1866.   return `${s}s`;

  1867. }

  1868. 

  1869. function fmtDurationSeconds(value) {

  1870.   if (!Number.isFinite(value) || value < 0) return '--';

  1871.   if (value >= 1) return `${value.toFixed(2)} s`;

  1872.   return `${(value * 1000).toFixed(0)} ms`;

  1873. }

  1874. 

  1875. function fmtBool(v) {

  1876.   return v == null ? '--' : (v ? 'ON' : 'OFF');

  1877. }

  1878. 

  1879. function fmtFreq(v) {

  1880.   return typeof v === 'number' ? v.toFixed(1) + ' MHz' : '--';

  1881. }

  1882. 

  1883. function fmtPercent(v) {

  1884.   if (typeof v !== 'number') return '--';

  1885.   return (v * 100).toFixed(0) + '%';

  1886. }

  1887. 

  1888. function ageString(ts) {

  1889.   if (!ts) return '--';

  1890.   const diff = Math.max(0, Math.floor((nowTs() - ts) / 1000));

  1891.   if (diff < 2) return 'just now';

  1892.   if (diff < 60) return diff + 's ago';

  1893.   const m = Math.floor(diff / 60);

  1894.   if (m < 60) return m + 'm ago';

  1895.   const h = Math.floor(m / 60);

  1896.   return h + 'h ago';

  1897. }

  1898. 

  1899. function updateText(id, text) {

  1900.   const el = $(id);

  1901.   if (el && el.textContent !== String(text)) el.textContent = text;

  1902. }

  1903. 

  1904. function updateHTML(id, html) {

  1905.   const el = $(id);

  1906.   if (el && el.innerHTML !== html) el.innerHTML = html;

  1907. }

  1908. 

  1909. function syncDirtyInput(id, key, transform = (v) => v) {

  1910.   const el = $(id);

  1911.   if (!el) return;

  1912.   const dirty = state.dirty.has(key);

  1913.   const desired = dirty ? transform(state.draft[key]) : transform(serverValue(key));

  1914.   const asString = desired == null ? '' : String(desired);

  1915.   const isFocused = document.activeElement === el;

  1916.   if (!isFocused || !dirty) {

  1917.     if (el.value !== asString) el.value = asString;

  1918.   }

  1919.   el.classList.toggle('input-dirty', dirty && !state.errors[key]);

  1920.   el.classList.toggle('input-error', !!state.errors[key]);

  1921. }

  1922. 

  1923. function renderFieldErrors() {

  1924.   renderFieldError('freq-error', state.errors.frequencyMHz);

  1925.   renderFieldError('ps-error', state.errors.ps);

  1926.   renderFieldError('rt-error', state.errors.radioText);

  1927. }

  1928. 

  1929. function renderFieldError(id, message) {

  1930.   const el = $(id);

  1931.   el.textContent = message || '';

  1932.   el.classList.toggle('show', !!message);

  1933. }

  1934. 

  1935. function setMeter(fillId, textId, ratio, text, mode = 'good') {

  1936.   const fill = $(fillId);

  1937.   const pct = Math.max(0, Math.min(100, Math.round((ratio ?? 0) * 100)));

  1938.   fill.style.width = pct + '%';

  1939.   fill.className = 'meter-fill' + (mode === 'warn' ? ' warn' : mode === 'err' ? ' err' : '');

  1940.   updateText(textId, text);

  1941. }

  1942. 

  1943. function applyMobilePanelDefaults() {

  1944.   if (!mobileMq.matches || state.mobilePanelsApplied) return;

  1945.   state.mobilePanelsApplied = true;

  1946.   document.querySelectorAll('.panel[data-panel-key]').forEach((panel) => {

  1947.     const key = panel.dataset.panelKey;

  1948.     const head = panel.querySelector('.panel-head');

  1949.     const body = panel.querySelector('.panel-body');

  1950.     const keepOpen = key === 'frequency' || key === 'danger';

  1951.     head.classList.toggle('collapsed', !keepOpen);

  1952.     body.classList.toggle('collapsed', !keepOpen);

  1953.   });

  1954. }

  1955. 

  1956. function syncFreqPresetIndex(value) {

  1957.   if (typeof value !== 'number') return;

  1958.   let closestIndex = 0;

  1959.   let closestDistance = Infinity;

  1960.   freqPresetValues.forEach((freq, idx) => {

  1961.     const dist = Math.abs(freq - value);

  1962.     if (dist < closestDistance) {

  1963.       closestDistance = dist;

  1964.       closestIndex = idx;

  1965.     }

  1966.   });

  1967.   state.freqPresetIndex = closestIndex;

  1968. }

  1969. 

  1970. function cycleFreqPreset(direction) {

  1971.   state.freqPresetIndex = (state.freqPresetIndex + direction + freqPresetValues.length) % freqPresetValues.length;

  1972.   const next = freqPresetValues[state.freqPresetIndex];

  1973.   setDirty('frequencyMHz', next);

  1974.   toast(`Preset ${next.toFixed(1)} MHz loaded`, 'info');

  1975. }

  1976. 

  1977. function refreshPresetButtons() {

  1978.   const effectiveFreq = effectiveValue('frequencyMHz');

  1979.   document.querySelectorAll('[data-freq-preset]').forEach((btn) => {

  1980.     const value = Number(btn.dataset.freqPreset);

  1981.     btn.classList.toggle('active', typeof effectiveFreq === 'number' && nearlyEqual(value, effectiveFreq, 0.05));

  1982.   });

  1983. }

  1984. 

  1985. function updateHeroState(engineState) {

  1986.   const hero = $('hero-card');

  1987.   hero.classList.remove('tx-live', 'tx-busy');

  1988.   if (state.txBusy || ['starting', 'stopping'].includes(engineState)) {

  1989.     hero.classList.add('tx-busy');

  1990.   } else if (engineState === 'running') {

  1991.     hero.classList.add('tx-live');

  1992.   }

  1993. }

  1994. 

  1995. function drawSparkline(svgId, values, mode = 'good', maxOverride = null) {

  1996.   const svg = $(svgId);

  1997.   if (!svg) return;

  1998.   svg.className = `spark ${mode}`;

  1999.   const width = 160;

  2000.   const height = 34;

  2001.   const points = values.length ? values : [0, 0];

  2002.   const max = maxOverride != null ? maxOverride : Math.max(...points, 1);

  2003.   const min = 0;

  2004.   const step = points.length <= 1 ? width : width / (points.length - 1);

  2005.   const coords = points.map((value, i) => {

  2006.     const x = i * step;

  2007.     const norm = max === min ? 0 : (value - min) / (max - min || 1);

  2008.     const y = height - 4 - norm * (height - 8);

  2009.     return [x, y];

  2010.   });

  2011.   const line = coords.map(([x, y], i) => `${i === 0 ? 'M' : 'L'}${x.toFixed(2)},${y.toFixed(2)}`).join(' ');

  2012.   const area = `${line} L ${width},${height} L 0,${height} Z`;

  2013.   svg.innerHTML = `<path class="area" d="${area}"></path><path class="line" d="${line}"></path>`;

  2014. }

  2015. 

  2016. function render() {

  2017.   const cfg = state.server.config || {};

  2018.   const runtime = state.server.runtime || {};

  2019.   const engine = runtime.engine || {};

  2020.   const driver = runtime.driver || {};

  2021.   const audioStream = runtime.audioStream || null;

  2022. 

  2023.   const appliedRaw = engine.appliedFrequencyMHz;

  2024.   const appliedFreq = Number.isFinite(Number(appliedRaw)) ? Number(appliedRaw) : null;

  2025.   const desiredRaw = cfg.fm?.frequencyMHz;

  2026.   const desiredFreq = Number.isFinite(Number(desiredRaw)) ? Number(desiredRaw) : null;

  2027.   const displayFreq = appliedFreq ?? effectiveValue('frequencyMHz') ?? desiredFreq;

  2028.   updateHTML('freq-display', `${typeof displayFreq === 'number' ? displayFreq.toFixed(1) : '---.-'}<span class="unit">MHz</span>`);

  2029.   const appliedLabel = appliedFreq != null ? `Applied ${appliedFreq.toFixed(1)} MHz` : 'Applied --';

  2030.   const desiredLabel = desiredFreq != null ? `Desired ${desiredFreq.toFixed(1)} MHz` : 'Desired --';

  2031.   updateText('freq-applied', appliedLabel);

  2032.   updateText('freq-desired', desiredLabel);

  2033.   const noteEl = $('freq-note');

  2034.   if (noteEl) {

  2035.     const mismatch = appliedFreq != null && desiredFreq != null && !nearlyEqual(appliedFreq, desiredFreq, 0.001);

  2036.     noteEl.classList.toggle('mismatch', mismatch);

  2037.   }

  2038. 

  2039.   updateText('badge-backend', cfg.backend?.kind || cfg.backend || '--');

  2040.   updateText('badge-mode', engine.state && engine.state !== 'idle' ? 'TX Active' : 'Control Plane');

  2041.   updateText('badge-live', state.server.runtimeOk ? 'Connected' : 'Waiting');

  2042. 

  2043.   updateText('t-chunks', fmt(engine.chunksProduced));

  2044.   updateText('t-samples', fmt(engine.totalSamples));

  2045.   updateText('t-uptime', fmtTime(engine.uptimeSeconds));

  2046.   updateText('t-rate', driver.effectiveSampleRateHz ? (driver.effectiveSampleRateHz / 1000).toFixed(0) + 'k' : '--');

  2047.   const underruns = engine.underruns ?? driver.underruns;

  2048.   const underrunEl = $('t-underruns');

  2049.   underrunEl.textContent = underruns == null ? '--' : String(underruns);

  2050.   underrunEl.className = 'value' + (underruns > 0 ? ' err' : underruns === 0 ? ' good' : '');

  2051. 

  2052.   const txStateValue = String(engine.state || 'idle').toLowerCase();

  2053.   const txState = state.txBusy ? 'WORKING…' : txStateValue.toUpperCase();

  2054.   const txClass = state.txBusy ? 'working' : txStateValue;

  2055.   $('tx-state').textContent = txState;

  2056.   $('tx-state').className = 'tx-state ' + txClass;

  2057.   updateText('tx-hint', engine.lastError ? `Last error: ${engine.lastError}` : (state.txBusy ? 'Command in progress' : 'Runtime polled every 1s'));

  2058.   updateHeroState(txStateValue);

  2059. 

  2060.   const startDisabled = state.txBusy || txStateValue === 'running';

  2061.   const stopDisabled = state.txBusy || ['idle', 'stopped', ''].includes(txStateValue);

  2062.   $('btn-start').disabled = startDisabled;

  2063.   $('btn-stop').disabled = stopDisabled;

  2064.   $('btn-refresh').disabled = state.pendingRequests > 0;

  2065.   $('danger-stop').disabled = stopDisabled;

  2066.   $('danger-refresh').disabled = state.pendingRequests > 0;

  2067.   const resetFaultBtn = $('danger-reset-fault');

  2068.   if (resetFaultBtn) {

  2069.     const resetDisabled = state.faultResetBusy || !state.server.runtimeOk;

  2070.     resetFaultBtn.disabled = resetDisabled;

  2071.     resetFaultBtn.textContent = state.faultResetBusy ? 'Resetting…' : 'Reset Fault';

  2072.   }

  2073. 

  2074.   syncDirtyInput('freq-slider', 'frequencyMHz', (v) => typeof v === 'number' ? v.toFixed(1) : '100.0');

  2075.   syncDirtyInput('freq-num', 'frequencyMHz', (v) => typeof v === 'number' ? v.toFixed(1) : '100.0');

  2076.   syncDirtyInput('rds-ps', 'ps', (v) => String(v ?? ''));

  2077.   syncDirtyInput('rds-rt', 'radioText', (v) => String(v ?? ''));

  2078. 

  2079.   const psValue = String(effectiveValue('ps') ?? cfg.rds?.ps ?? '');

  2080.   const rtValue = String(effectiveValue('radioText') ?? cfg.rds?.radioText ?? '');

  2081.   updateText('ps-count', psValue.length);

  2082.   updateText('rt-count', rtValue.length);

  2083.   renderFieldErrors();

  2084.   refreshPresetButtons();

  2085. 

  2086.   renderToggle('stereoEnabled', 'tog-stereo', 'stereo-label');

  2087.   renderToggle('rdsEnabled', 'tog-rds', 'rds-label');

  2088.   renderToggle('limiterEnabled', 'tog-limiter', 'limiter-label');

  2089. 

  2090.   const freqDirty = isDirtySection('freq');

  2091.   $('freq-apply').disabled = !freqDirty || sectionHasErrors('freq');

  2092.   $('freq-reset').disabled = !freqDirty;

  2093.   const rdsDirty = isDirtySection('rds');

  2094.   $('rds-apply').disabled = !rdsDirty || sectionHasErrors('rds');

  2095.   $('rds-reset').disabled = !rdsDirty;

  2096. 

  2097.   updateText('freq-meta', sectionHasErrors('freq') ? 'Validation error' : (freqDirty ? 'Unsaved changes' : 'Live-tunable'));

  2098.   updateText('rds-meta', sectionHasErrors('rds') ? 'Validation error' : (rdsDirty ? `${Object.keys(getSectionPatch('rds')).length} unsaved` : 'PS + RT'));

  2099. 

  2100.   updateText('info-backend', cfg.backend?.kind || cfg.backend || '--');

  2101.   updateText('info-freq', fmtFreq(cfg.fm?.frequencyMHz));

  2102.   updateText('info-preemph', cfg.fm?.preEmphasisTauUS ? `${cfg.fm.preEmphasisTauUS} µs` : 'Off');

  2103.   updateText('info-fmmod', fmtBool(cfg.fm?.fmModulationEnabled));

  2104.   updateText('info-runtime-age', ageString(state.server.lastRuntimeAt));

  2105.   updateText('info-last-alert', engine.runtimeAlert ? engine.runtimeAlert : (engine.lastError ? engine.lastError : 'None'));

  2106.   updateText('info-live', engine.state ? `${String(engine.state).toUpperCase()} / ${state.server.runtimeOk ? 'runtime ok' : 'runtime pending'}` : (state.server.configOk ? 'config only' : '--'));

  2107. 

  2108.   updateHealth(engine, driver, audioStream);

  2109.   updateControlAudit(runtime.controlAudit);

  2110.   updateFaultHistory(engine);

  2111.   updateTransitionHistory();

  2112.   updateResetHint(engine);

  2113.   updateMeters(engine, driver, audioStream);

  2114.   const highWatermarkDurationSecondsRaw = audioStream?.highWatermarkDurationSeconds;

  2115.   const highWatermarkDurationSeconds = Number(highWatermarkDurationSecondsRaw);

  2116.   const highWatermarkFramesRaw = audioStream?.highWatermark;

  2117.   const highWatermarkFrames = Number.isFinite(Number(highWatermarkFramesRaw)) ? Number(highWatermarkFramesRaw) : 0;

  2118.   const capacityRaw = audioStream?.capacity;

  2119.   const capacity = Number.isFinite(Number(capacityRaw)) ? Number(capacityRaw) : 0;

  2120.   const bufferedDurationSecondsRaw = audioStream?.bufferedDurationSeconds;

  2121.   const bufferedDurationSeconds = Number(bufferedDurationSecondsRaw);

  2122.   const hasBufferedDuration = Number.isFinite(bufferedDurationSeconds);

  2123.   const hasHighWatermarkDuration = Number.isFinite(highWatermarkDurationSeconds);

  2124.   const highWatermarkRatio = capacity > 0 ? Math.min(1, highWatermarkFrames / capacity) : 0;

  2125.   let highWatermarkMode = 'good';

  2126.   if (highWatermarkRatio >= 0.95) highWatermarkMode = 'err';

  2127.   else if (highWatermarkRatio >= 0.65) highWatermarkMode = 'warn';

  2128.   const sparkHighWatermarkMax = Math.max(

  2129.     1,

  2130.     hasHighWatermarkDuration ? highWatermarkDurationSeconds : 0,

  2131.     hasBufferedDuration ? bufferedDurationSeconds : 0

  2132.   );

  2133.   const queueHealthRaw = String(engine.queue?.health || '').toLowerCase();

  2134.   let queueSparkMode = 'good';

  2135.   if (queueHealthRaw === 'critical') queueSparkMode = 'err';

  2136.   else if (queueHealthRaw === 'low') queueSparkMode = 'warn';

  2137.   drawSparkline('spark-audio', state.charts.audio, 'good', 1);

  2138.   drawSparkline('spark-high-watermark', state.charts.highWatermark, highWatermarkMode, sparkHighWatermarkMax);

  2139.   drawSparkline('spark-queue-fill', state.charts.queueFill, queueSparkMode, 1);

  2140.   drawSparkline('spark-underruns', state.charts.underruns, underruns > 0 ? 'err' : 'warn');

  2141.   drawSparkline('spark-tx', state.charts.tx, txStateValue === 'running' ? 'good' : 'warn', 1);

  2142.   applyMobilePanelDefaults();

  2143. }

  2144. 

  2145. function renderToggle(key, toggleId, labelId) {

  2146.   const on = !!serverValue(key);

  2147.   const busy = !!state.toggleBusy[key];

  2148.   const el = $(toggleId);

  2149.   el.className = 'toggle' + (on ? ' on' : '') + (busy ? ' busy' : '');

  2150.   el.setAttribute('aria-checked', on ? 'true' : 'false');

  2151.   updateText(labelId, busy ? '...' : (on ? 'ON' : 'OFF'));

  2152. }

  2153. 

  2154. function runtimeStateClass(engineState) {

  2155.   const normalized = String(engineState || '').toLowerCase();

  2156.   if (!normalized) {

  2157.     return 'warn';

  2158.   }

  2159.   switch (normalized) {

  2160.     case 'faulted':

  2161.       return 'err';

  2162.     case 'muted':

  2163.     case 'degraded':

  2164.     case 'prebuffering':

  2165.     case 'arming':

  2166.     case 'stopping':

  2167.     case 'idle':

  2168.     case 'unknown':

  2169.       return 'warn';

  2170.     default:

  2171.       return 'good';

  2172.   }

  2173. }

  2174. 

  2175. 

  2176. 

  2177. function normalizeRuntimeState(stateName) {

  2178.   const normalized = (typeof stateName === 'string' ? stateName.trim().toLowerCase() : '');

  2179.   return normalized || 'idle';

  2180. }

  2181. 

  2182. function runtimeStateSeverity(stateName) {

  2183.   const normalized = normalizeRuntimeState(stateName);

  2184.   switch (normalized) {

  2185.     case 'running':

  2186.       return 'ok';

  2187.     case 'degraded':

  2188.     case 'muted':

  2189.       return 'warn';

  2190.     case 'faulted':

  2191.       return 'err';

  2192.     default:

  2193.       return 'info';

  2194.   }

  2195. }

  2196. 

  2197. function notifyRuntimeTransition(engine, pushHistory = true) {

  2198.   if (!engine) return;

  2199.   const next = normalizeRuntimeState(engine.state);

  2200.   const prev = state.lastRuntimeState;

  2201.   state.lastRuntimeState = next;

  2202.   if (!prev || prev === next) return;

  2203.   const severity = runtimeStateSeverity(next);

  2204.   if (pushHistory) {

  2205.     pushTransitionHistory(prev, next, severity);

  2206.   }

  2207.   const message = `Runtime ${prev.toUpperCase()} → ${next.toUpperCase()}`;

  2208.   const logLevel = severity === 'err' ? 'err' : (severity === 'warn' ? 'warn' : 'info');

  2209.   toast(message, severity);

  2210.   log(message, logLevel);

  2211. }

  2212. 

  2213. 

  2214. function updateHealth(engine, driver, audioStream) {

  2215.   engine = engine || {};

  2216.   driver = driver || {};

  2217.   updateText('health-http', state.server.configOk ? 'OK' : 'OFFLINE');

  2218.   $('health-http').className = 'val ' + (state.server.configOk ? 'good' : 'err');

  2219. 

  2220.   let runtimeLabel = 'WAITING';

  2221.   let runtimeClass = 'warn';

  2222.   if (state.server.runtimeOk) {

  2223.     const engineStateName = String(engine.state || 'unknown');

  2224.     runtimeLabel = engineStateName.toUpperCase();

  2225.     runtimeClass = runtimeStateClass(engineStateName);

  2226.   }

  2227.   updateText('health-runtime', runtimeLabel);

  2228.   $('health-runtime').className = 'val ' + runtimeClass;

  2229. 

  2230.   const durationSeconds = Number(engine.runtimeStateDurationSeconds);

  2231.   const durationLabel = Number.isFinite(durationSeconds) && durationSeconds > 0 ? fmtTime(durationSeconds) : '--';

  2232.   updateText('health-state-age', durationLabel);

  2233.   const stateAgeEl = $('health-state-age');

  2234.   if (stateAgeEl) {

  2235.     stateAgeEl.className = 'val ' + runtimeClass;

  2236.   }

  2237. 

  2238.   const runtimeIndicator = engine.runtimeIndicator;

  2239.   const indicatorLabels = {

  2240.     normal: 'Normal',

  2241.     degraded: 'Degraded',

  2242.     queueCritical: 'Queue critical',

  2243.   };

  2244.   const indicatorText = indicatorLabels[runtimeIndicator] || (runtimeIndicator ? runtimeIndicator : '--');

  2245.   let indicatorSeverity = '';

  2246.   if (runtimeIndicator === 'queueCritical') indicatorSeverity = 'err';

  2247.   else if (runtimeIndicator === 'degraded') indicatorSeverity = 'warn';

  2248.   else if (runtimeIndicator === 'normal') indicatorSeverity = 'good';

  2249.   const indicatorEl = $('health-indicator');

  2250.   if (indicatorEl) {

  2251.     indicatorEl.className = 'val' + (indicatorSeverity ? ' ' + indicatorSeverity : '');

  2252.   }

  2253.   updateText('health-indicator', indicatorText);

  2254. 

  2255.   const runtimeAlertRaw = (engine.runtimeAlert || '').trim();

  2256.   const hasAlert = !!runtimeAlertRaw;

  2257.   const alertEl = $('health-alert');

  2258.   if (alertEl) {

  2259.     alertEl.className = 'val ' + (hasAlert ? 'warn' : 'good');

  2260.   }

  2261.   updateText('health-alert', hasAlert ? runtimeAlertRaw : 'None');

  2262. 

  2263.   let audioLabel = 'N/A';

  2264.   let audioClass = 'val';

  2265.   if (audioStream) {

  2266.     const fill = typeof audioStream.buffered === 'number' ? audioStream.buffered : null;

  2267.     audioLabel = fill == null ? 'Unknown' : fmtPercent(fill);

  2268.     if (fill == null) audioClass = 'val';

  2269.     else if (fill < 0.05) audioClass = 'val err';

  2270.     else if (fill < 0.2) audioClass = 'val warn';

  2271.     else audioClass = 'val good';

  2272.   }

  2273.   updateText('health-audio', audioLabel);

  2274.   $('health-audio').className = audioClass;

  2275. 

  2276.   const bufferedDurationSeconds = Number(audioStream?.bufferedDurationSeconds);

  2277.   updateText('health-buffer-duration', fmtDurationSeconds(bufferedDurationSeconds));

  2278. 

  2279.   const highWatermarkRaw = audioStream?.highWatermark;

  2280.   const highWatermarkFrames = Number.isFinite(Number(highWatermarkRaw)) ? Number(highWatermarkRaw) : null;

  2281.   const highWatermarkDurationRaw = audioStream?.highWatermarkDurationSeconds;

  2282.   const highWatermarkDuration = Number.isFinite(Number(highWatermarkDurationRaw)) ? Number(highWatermarkDurationRaw) : null;

  2283.   let highWatermarkLabel = '--';

  2284.   if (highWatermarkDuration !== null) {

  2285.     highWatermarkLabel = fmtDurationSeconds(highWatermarkDuration);

  2286.     if (highWatermarkFrames !== null) {

  2287.       highWatermarkLabel += ` (${highWatermarkFrames} frames)`;

  2288.     }

  2289.   } else if (highWatermarkFrames !== null) {

  2290.     highWatermarkLabel = `${highWatermarkFrames} frames`;

  2291.   }

  2292.   updateText('health-buffer-highwater', highWatermarkLabel);

  2293. 

  2294.   const queueFill = Number(engine.queue?.fillLevel);

  2295.   const queueHealthRaw = String(engine.queue?.health || '').toLowerCase();

  2296.   const queueHealthLabel = queueHealthRaw ? queueHealthRaw[0].toUpperCase() + queueHealthRaw.slice(1) : '';

  2297.   let queueFillLabel = '--';

  2298.   if (Number.isFinite(queueFill)) {

  2299.     queueFillLabel = fmtPercent(queueFill);

  2300.     if (queueHealthLabel) queueFillLabel += ` · ${queueHealthLabel}`;

  2301.   } else if (queueHealthLabel) {

  2302.     queueFillLabel = queueHealthLabel;

  2303.   }

  2304.   updateText('health-queue-fill', queueFillLabel);

  2305.   const queueFillEl = $('health-queue-fill');

  2306.   if (queueFillEl) {

  2307.     let queueFillClass = 'good';

  2308.     if (queueHealthRaw === 'critical') queueFillClass = 'err';

  2309.     else if (queueHealthRaw === 'low') queueFillClass = 'warn';

  2310.     queueFillEl.className = 'val ' + queueFillClass;

  2311.   }

  2312. 

  2313.   const streakEl = $('health-underrun-streak');

  2314.   if (streakEl) {

  2315.     const streakRaw = driver?.underrunStreak;

  2316.     const streakMaxRaw = driver?.maxUnderrunStreak;

  2317.     const streakCurrent = Number.isFinite(Number(streakRaw)) ? Number(streakRaw) : null;

  2318.     const streakMax = Number.isFinite(Number(streakMaxRaw)) ? Number(streakMaxRaw) : null;

  2319.     let streakLabel = '--';

  2320.     if (streakCurrent != null) {

  2321.       streakLabel = String(streakCurrent);

  2322.       if (streakMax != null) {

  2323.         streakLabel += ` (max ${streakMax})`;

  2324.       }

  2325.     } else if (streakMax != null) {

  2326.       streakLabel = `Max ${streakMax}`;

  2327.     }

  2328.     let streakSeverity = '';

  2329.     if (streakCurrent != null || streakMax != null) {

  2330.       const highestStreak = Math.max(

  2331.         streakCurrent != null ? streakCurrent : 0,

  2332.         streakMax != null ? streakMax : 0

  2333.       );

  2334.       if (highestStreak >= 6) streakSeverity = ' err';

  2335.       else if (highestStreak > 0) streakSeverity = ' warn';

  2336.       else streakSeverity = ' good';

  2337.     }

  2338.     streakEl.textContent = streakLabel;

  2339.     streakEl.className = 'val' + streakSeverity;

  2340.   }

  2341. 

  2342.   const last = Math.max(state.server.lastConfigAt || 0, state.server.lastRuntimeAt || 0);

  2343.   updateText('health-last', ageString(last));

  2344. 

  2345.   const transitionsAvailable = engine.degradedTransitions != null || engine.mutedTransitions != null || engine.faultedTransitions != null;

  2346.   const transitionsText = transitionsAvailable ? `${Number(engine.degradedTransitions ?? 0)} / ${Number(engine.mutedTransitions ?? 0)} / ${Number(engine.faultedTransitions ?? 0)}` : '--';

  2347.   updateText('health-transitions', transitionsText);

  2348. 

  2349.   const faultCountValue = engine.faultCount != null ? Number(engine.faultCount) : 0;

  2350.   const hasFaultCount = engine.faultCount != null;

  2351.   updateText('health-fault-count', hasFaultCount ? String(faultCountValue) : '--');

  2352.   const faultCountEl = $('health-fault-count');

  2353.   if (faultCountEl) {

  2354.     faultCountEl.className = 'val' + (hasFaultCount ? (faultCountValue > 0 ? ' warn' : ' good') : '');

  2355.   }

  2356. 

  2357.   const lastFaultEl = $('health-last-fault');

  2358.   const lastFault = engine.lastFault;

  2359.   if (lastFaultEl) {

  2360.     if (lastFault) {

  2361.       const severity = String(lastFault.severity || '').toLowerCase();

  2362.       const severityClass = severity === 'faulted' ? 'err' : 'warn';

  2363.       const severityLabel = (lastFault.severity || 'Fault').toUpperCase();

  2364.       const reasonLabel = lastFault.reason ? ` ${lastFault.reason}` : '';

  2365.       const messageLabel = lastFault.message ? ` - ${lastFault.message}` : '';

  2366.       let whenLabel = '';

  2367.       if (lastFault.time) {

  2368.         const parsed = new Date(lastFault.time);

  2369.         if (!Number.isNaN(parsed.getTime())) {

  2370.           whenLabel = ` @ ${parsed.toLocaleTimeString()}`;

  2371.         }

  2372.       }

  2373.       const title = `${severityLabel}${reasonLabel}`;

  2374.       updateText('health-last-fault', `${title}${messageLabel}${whenLabel}`);

  2375.       lastFaultEl.className = 'val ' + severityClass;

  2376.     } else {

  2377.       lastFaultEl.className = 'val good';

  2378.       updateText('health-last-fault', 'None');

  2379.     }

  2380.   }

  2381. }

  2382. 

  2383. 

  2384. 

  2385. function updateControlAudit(audit) {

  2386.   const entries = [

  2387.     { key: 'methodNotAllowed', id: 'audit-methodNotAllowed' },

  2388.     { key: 'unsupportedMediaType', id: 'audit-unsupportedMediaType' },

  2389.     { key: 'bodyTooLarge', id: 'audit-bodyTooLarge' },

  2390.     { key: 'unexpectedBody', id: 'audit-unexpectedBody' },

  2391.   ];

  2392.   let total = 0;

  2393.   let hasData = false;

  2394.   entries.forEach(({ key, id }) => {

  2395.     const raw = audit && typeof audit[key] !== 'undefined' ? Number(audit[key]) : NaN;

  2396.     const value = Number.isFinite(raw) ? raw : null;

  2397.     if (value != null) {

  2398.       hasData = true;

  2399.       total += value;

  2400.     }

  2401.     setAuditValue(id, value);

  2402.   });

  2403.   setAuditValue('audit-total', hasData ? total : null);

  2404. }

  2405. 

  2406. function setAuditValue(id, count) {

  2407.   const el = $(id);

  2408.   if (!el) return;

  2409.   if (count == null) {

  2410.     el.textContent = '--';

  2411.     el.className = 'val';

  2412.     return;

  2413.   }

  2414.   el.textContent = String(count);

  2415.   el.className = 'val ' + (count > 0 ? 'warn' : 'good');

  2416. }

  2417. 

  2418. function updateFaultHistory(engine) {

  2419.   const container = $('fault-history');

  2420.   if (!container) return;

  2421.   const history = Array.isArray(engine?.faultHistory) ? engine.faultHistory : [];

  2422.   if (!history.length) {

  2423.     container.innerHTML = '<div class="fault-history-empty">No faults recorded yet.</div>';

  2424.     return;

  2425.   }

  2426.   const rows = history.slice().reverse().map((entry) => {

  2427.     const when = entry?.time ? new Date(entry.time) : null;

  2428.     const timeLabel = when && !Number.isNaN(when.getTime()) ? when.toLocaleTimeString() : '--:--';

  2429.     const severity = String(entry?.severity || 'warn').toLowerCase();

  2430.     const severityLabel = String(entry?.severity || 'Fault').toUpperCase();

  2431.     const reasonLabel = entry?.reason ? ` ${entry.reason}` : '';

  2432.     const messageLabel = entry?.message ? ` · ${entry.message}` : '';

  2433.     return `<div class="fault-history-entry ${severity}"><span class="fault-history-time">${timeLabel}</span><span class="fault-history-desc">${severityLabel}${reasonLabel}${messageLabel}</span></div>`;

  2434.   });

  2435.   container.innerHTML = rows.join('');

  2436. }

  2437. 

  2438. function updateResetHint(engine) {

  2439.   const hint = $('reset-hint');

  2440.   if (!hint) return;

  2441.   const stateName = String(engine?.state || '').toLowerCase();

  2442.   let text = 'Manual fault reset drops runtime to DEGRADED while the queue recovers.';

  2443.   if (stateName === 'faulted') {

  2444.     text = 'Faulted: reset moves runtime back to DEGRADED until the queue settles.';

  2445.   } else if (stateName === 'muted' || stateName === 'degraded') {

  2446.     text = 'Reset Fault keeps the runtime in DEGRADED so the queue can recover before running again.';

  2447.   }

  2448.   const durationSeconds = Number(engine?.runtimeStateDurationSeconds);

  2449.   const durationLabel = Number.isFinite(durationSeconds) && durationSeconds > 0 ? fmtTime(durationSeconds) : null;

  2450.   const ageHint = durationLabel ? ` State age ${durationLabel}.` : '';

  2451.   hint.textContent = text + ageHint;

  2452. }

  2453. 

  2454. function updateMeters(engine, driver, audioStream) {

  2455.   if (audioStream && typeof audioStream.buffered === 'number') {

  2456.     const ratio = Math.max(0, Math.min(1, audioStream.buffered));

  2457.     const mode = ratio < 0.05 ? 'err' : ratio < 0.2 ? 'warn' : 'good';

  2458.     setMeter('meter-audio-fill', 'meter-audio-text', ratio, fmtPercent(ratio), mode);

  2459.   } else {

  2460.     setMeter('meter-audio-fill', 'meter-audio-text', 0, 'N/A', 'warn');

  2461.   }

  2462. 

  2463.   const underruns = Number(engine.underruns ?? driver.underruns ?? 0);

  2464.   const healthRatio = underruns <= 0 ? 1 : Math.max(0, 1 - Math.min(underruns, 10) / 10);

  2465.   const healthMode = underruns === 0 ? 'good' : underruns < 3 ? 'warn' : 'err';

  2466.   setMeter('meter-stream-fill', 'meter-stream-text', healthRatio, underruns === 0 ? 'Clean' : `${underruns} underrun${underruns === 1 ? '' : 's'}`, healthMode);

  2467. 

  2468.   const txState = String(engine.state || 'idle').toLowerCase();

  2469.   const activeRatio = txState === 'running' ? 1 : state.txBusy ? 0.55 : 0.08;

  2470.   const activeMode = txState === 'running' ? 'good' : state.txBusy ? 'warn' : 'err';

  2471.   const activeText = txState === 'running' ? 'Live' : state.txBusy ? 'Working' : 'Idle';

  2472.   setMeter('meter-tx-fill', 'meter-tx-text', activeRatio, activeText, activeMode);

  2473. }

  2474. 

  2475. function toast(msg, type = 'info') {

  2476.   const t = $('toast');

  2477.   t.textContent = msg;

  2478.   t.className = 'toast ' + type + ' show';

  2479.   clearTimeout(t._timer);

  2480.   t._timer = setTimeout(() => t.classList.remove('show'), 2600);

  2481. }

  2482. 

  2483. function log(message, type = '') {

  2484.   const logEl = $('log');

  2485.   const empty = logEl.querySelector('.empty-log');

  2486.   if (empty) empty.remove();

  2487.   const row = document.createElement('div');

  2488.   row.className = 'entry ' + type;

  2489.   row.textContent = `${new Date().toLocaleTimeString()}  ${message}`;

  2490.   logEl.appendChild(row);

  2491.   while (logEl.children.length > 250) logEl.removeChild(logEl.firstChild);

  2492.   logEl.scrollTop = logEl.scrollHeight;

  2493. }

  2494. 

  2495. function bindTabs() {

  2496.   const buttons = Array.from(document.querySelectorAll('.tab-btn[data-tab]'));

  2497.   const panels = Array.from(document.querySelectorAll('.tab-panel[data-tab-panel]'));

  2498.   const activate = (tab) => {

  2499.     buttons.forEach((btn) => btn.classList.toggle('active', btn.dataset.tab === tab));

  2500.     panels.forEach((panel) => panel.classList.toggle('active', panel.dataset.tabPanel === tab));

  2501.   };

  2502.   buttons.forEach((btn) => btn.addEventListener('click', () => activate(btn.dataset.tab)));

  2503. }

  2504. 

  2505. function bindPanels() {

  2506.   document.querySelectorAll('[data-panel]').forEach((head) => {

  2507.     head.addEventListener('click', () => {

  2508.       head.classList.toggle('collapsed');

  2509.       head.nextElementSibling.classList.toggle('collapsed');

  2510.     });

  2511.   });

  2512. }

  2513. 

  2514. function bindInputs() {

  2515.   $('freq-slider').addEventListener('input', (e) => {

  2516.     const value = Number(e.target.value);

  2517.     setDirty('frequencyMHz', value);

  2518.   });

  2519.   $('freq-num').addEventListener('input', (e) => {

  2520.     const value = Number(e.target.value);

  2521.     if (!Number.isNaN(value)) setDirty('frequencyMHz', value);

  2522.     else {

  2523.       state.errors.frequencyMHz = 'Enter a valid number.';

  2524.       render();

  2525.     }

  2526.   });

  2527. 

  2528.   $('rds-ps').addEventListener('input', (e) => setDirty('ps', e.target.value.toUpperCase().slice(0, 8)));

  2529.   $('rds-rt').addEventListener('input', (e) => setDirty('radioText', e.target.value.slice(0, 64)));

  2530. 

  2531.   $('freq-apply').addEventListener('click', () => applySection('freq'));

  2532.   $('rds-apply').addEventListener('click', () => applySection('rds'));

  2533.   $('freq-reset').addEventListener('click', () => resetSection('freq'));

  2534.   $('rds-reset').addEventListener('click', () => resetSection('rds'));

  2535. 

  2536.   $('btn-start').addEventListener('click', () => txAction('start'));

  2537.   $('btn-stop').addEventListener('click', () => txAction('stop'));

  2538.   $('danger-stop').addEventListener('click', () => txAction('stop'));

  2539.   $('btn-refresh').addEventListener('click', manualRefresh);

  2540.   $('danger-refresh').addEventListener('click', manualRefresh);

  2541.   $('danger-reset-fault').addEventListener('click', () => resetFaultAction());

  2542. 

  2543.   document.querySelectorAll('.toggle[data-toggle]').forEach((toggle) => {

  2544.     const key = toggle.dataset.toggle;

  2545.     const handler = () => setToggle(key, !serverValue(key));

  2546.     toggle.addEventListener('click', handler);

  2547.     toggle.addEventListener('keydown', (e) => {

  2548.       if (e.key === 'Enter' || e.key === ' ') {

  2549.         e.preventDefault();

  2550.         handler();

  2551.       }

  2552.     });

  2553.   });

  2554. 

  2555.   document.querySelectorAll('[data-freq-preset]').forEach((btn) => {

  2556.     btn.addEventListener('click', () => {

  2557.       const value = Number(btn.dataset.freqPreset);

  2558.       setDirty('frequencyMHz', value);

  2559.       toast(`Frequency preset ${value.toFixed(1)} MHz loaded`, 'info');

  2560.     });

  2561.   });

  2562. 

  2563.   document.querySelectorAll('[data-rds-ps]').forEach((btn) => {

  2564.     btn.addEventListener('click', () => {

  2565.       setDirty('ps', btn.dataset.rdsPs || '');

  2566.       setDirty('radioText', btn.dataset.rdsRt || '');

  2567.       toast('RDS preset loaded', 'info');

  2568.     });

  2569.   });

  2570. 

  2571.   $('btn-clear-log').addEventListener('click', () => {

  2572.     $('log').innerHTML = '<div class="empty-log">No events yet.</div>';

  2573.     toast('Log cleared', 'info');

  2574.   });

  2575. }

  2576. 

  2577. async function manualRefresh() {

  2578.   beginRequest();

  2579.   try {

  2580.     await Promise.allSettled([

  2581.       loadConfig({ silent: true }),

  2582.       loadRuntime({ silent: true }),

  2583.     ]);

  2584.     toast('Refreshed', 'info');

  2585.     log('Manual refresh completed', 'info');

  2586.   } finally {

  2587.     endRequest();

  2588.   }

  2589. }

  2590. 

  2591. function startPollers() {

  2592.   if (state.pollersStarted) return;

  2593.   state.pollersStarted = true;

  2594.   setInterval(() => { loadRuntime({ silent: true }); }, runtimePollMs);

  2595.   setInterval(() => { loadConfig({ silent: true }); }, configPollMs);

  2596. }

  2597. 

  2598. function bindResponsiveBehavior() {

  2599.   const listener = () => {

  2600.     if (!mobileMq.matches) {

  2601.       state.mobilePanelsApplied = false;

  2602.       return;

  2603.     }

  2604.     applyMobilePanelDefaults();

  2605.   };

  2606.   if (mobileMq.addEventListener) mobileMq.addEventListener('change', listener);

  2607.   else mobileMq.addListener(listener);

  2608. }

  2609. 

  2610. function isTypingContext(target) {

  2611.   if (!target) return false;

  2612.   const tag = (target.tagName || '').toLowerCase();

  2613.   return tag === 'input' || tag === 'textarea' || target.isContentEditable;

  2614. }

  2615. 

  2616. function bindKeyboardShortcuts() {

  2617.   window.addEventListener('keydown', (e) => {

  2618.     if (isTypingContext(e.target)) {

  2619.       if (e.key !== 'Enter') return;

  2620.       if (state.dirty.has('frequencyMHz')) {

  2621.         e.preventDefault();

  2622.         applySection('freq');

  2623.       } else if (isDirtySection('rds')) {

  2624.         e.preventDefault();

  2625.         applySection('rds');

  2626.       }

  2627.       return;

  2628.     }

  2629. 

  2630.     if (e.key === 't' && !e.shiftKey) {

  2631.       e.preventDefault();

  2632.       txAction('start');

  2633.       return;

  2634.     }

  2635.     if ((e.key === 'T') || (e.key === 't' && e.shiftKey)) {

  2636.       e.preventDefault();

  2637.       txAction('stop');

  2638.       return;

  2639.     }

  2640.     if (e.key.toLowerCase() === 'r') {

  2641.       e.preventDefault();

  2642.       manualRefresh();

  2643.       return;

  2644.     }

  2645.     if (e.key === '[') {

  2646.       e.preventDefault();

  2647.       cycleFreqPreset(-1);

  2648.       return;

  2649.     }

  2650.     if (e.key === ']') {

  2651.       e.preventDefault();

  2652.       cycleFreqPreset(1);

  2653.       return;

  2654.     }

  2655.     if (e.key === 'Enter') {

  2656.       e.preventDefault();

  2657.       if (state.dirty.has('frequencyMHz')) applySection('freq');

  2658.       else if (isDirtySection('rds')) applySection('rds');

  2659.     }

  2660.   });

  2661. }

  2662. 

  2663. async function init() {

  2664.   bindTabs();

  2665.   bindPanels();

  2666.   bindInputs();

  2667.   bindResponsiveBehavior();

  2668.   bindKeyboardShortcuts();

  2669.   render();

  2670.   log('fm-rds-tx control UI booting', 'info');

  2671. 

  2672.   await Promise.allSettled([

  2673.     loadConfig({ silent: false }),

  2674.     loadRuntime({ silent: true }),

  2675.   ]);

  2676. 

  2677.   render();

  2678.   startPollers();

  2679.   log('Polling active: runtime 1s, config 8s', 'ok');

  2680.   log('Keyboard shortcuts armed', 'info');

  2681. }

  2682. 

  2683. init();

  2684. </script>

  2685. </body>

  2686. </html>