/* CommTheorySim — bancada escura, cores de canal de osciloscópio */

:root {
  --bg: #0c0b09;
  --panel: #13120f;
  --panel-2: #1a1915;
  --raise: #201e19;
  --border: #2b2923;
  --rule: #22201b;
  --text: #ebe6da;
  --muted: #8c8676;
  --faint: #5c574b;
  --grid: #2e2b25;
  --plot-bg: #090806;
  --accent: #ffb020;      /* âmbar: destaque da interface */
  --accent-dim: #6b4a0c;

  /* Canais (convenção dos osciloscópios: CH1 amarelo, CH2 ciano, CH3 magenta, CH4 verde) */
  --c-msg: #f2d544;
  --c-mod: #4fd3e6;
  --c-env: #ff5ca8;
  --c-line: #62e08e;
  --c-car: #857e6c;
  --c-theory: #f3ead4;
  --c-noise: #ff7a3d;

  --font-sans: "IBM Plex Sans", ui-sans-serif, system-ui, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --font-serif: "IBM Plex Serif", "STIX Two Text", Georgia, serif;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 14px/1.5 var(--font-sans);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
::selection { background: var(--accent); color: var(--bg); }

/* ---------- Cabeçalho ---------- */
.top {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 10px 20px; background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 5;
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo { width: 40px; height: 20px; }
.logo path { fill: none; stroke: var(--accent); stroke-width: 2.2; stroke-linecap: round; }
.brand h1 { margin: 0; font: 600 17px/1.1 var(--font-mono); letter-spacing: -0.2px; }
.brand .sub { color: var(--muted); font: 11.5px var(--font-mono); letter-spacing: .3px; }

.tabs { display: flex; align-items: center; gap: 4px; }
.tabs .tabs-sep {
  color: var(--faint); font: 10.5px var(--font-mono); text-transform: uppercase; letter-spacing: 1.2px;
  margin: 0 6px 0 14px;
}
.tabs .tabs-sep:first-child { margin-left: 0; }
.tabs button {
  background: var(--panel-2); color: var(--muted);
  border: 1px solid var(--border); border-radius: 3px;
  padding: 6px 14px 7px; cursor: pointer;
  font: 600 13px var(--font-mono); letter-spacing: .5px;
  transition: color .12s, border-color .12s;
}
.tabs button:hover { color: var(--text); border-color: var(--faint); }
.tabs button.active {
  color: var(--accent); border-color: var(--accent-dim);
  box-shadow: inset 0 -2px 0 var(--accent);
  background: var(--raise);
}

/* ---------- Estrutura ---------- */
.layout { display: grid; grid-template-columns: 296px 1fr; min-height: calc(100vh - 53px); }
.panel {
  background: var(--panel); border-right: 1px solid var(--border);
  padding: 6px 18px 40px; overflow-y: auto;
  max-height: calc(100vh - 53px); position: sticky; top: 53px;
  counter-reset: grp;
  scrollbar-width: thin; scrollbar-color: var(--border) transparent;
}
.main { padding: 16px 20px 28px; min-width: 0; }

/* ---------- Controles ---------- */
.group { margin: 16px 0 6px; counter-increment: grp; }
.group h3 {
  display: flex; align-items: center; gap: 8px;
  margin: 0 0 10px; color: var(--muted);
  font: 500 10.5px var(--font-mono); text-transform: uppercase; letter-spacing: 1.2px;
}
.group h3::before { content: counter(grp, decimal-leading-zero); color: var(--accent); }
.group h3::after { content: ""; flex: 1; height: 1px; background: var(--rule); }

.ctl { margin-bottom: 12px; }
.ctl .row { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.ctl label { font-size: 13px; color: var(--text); }
.ctl .val { font: 500 12.5px var(--font-mono); color: var(--accent); font-variant-numeric: tabular-nums; white-space: nowrap; }
.ctl .help { color: var(--muted); font-size: 11.5px; margin-top: 3px; line-height: 1.4; }
.ctl .help:empty { display: none; }

/* Slider estilo fader */
input[type=range] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 18px; margin: 4px 0 0; background: transparent; cursor: pointer;
}
input[type=range]::-webkit-slider-runnable-track { height: 2px; background: var(--border); }
input[type=range]::-moz-range-track { height: 2px; background: var(--border); }
input[type=range]::-moz-range-progress { height: 2px; background: var(--accent-dim); }
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 10px; height: 16px; margin-top: -7px;
  background: var(--text); border: 1px solid var(--bg); border-radius: 2px;
  box-shadow: inset 0 -2px 0 var(--accent);
}
input[type=range]::-moz-range-thumb {
  width: 10px; height: 16px; background: var(--text); border: 1px solid var(--bg); border-radius: 2px;
  box-shadow: inset 0 -2px 0 var(--accent);
}
input[type=range]:hover::-webkit-slider-thumb { background: #fff; }
input[type=range]:focus-visible { outline: 1px dashed var(--accent); outline-offset: 2px; }

select, .ctl input[type=text] {
  width: 100%; margin-top: 5px;
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 3px;
  padding: 6px 8px; font: 13px var(--font-sans);
}
select:hover, .ctl input[type=text]:hover { border-color: var(--faint); }
select:focus, .ctl input[type=text]:focus { outline: none; border-color: var(--accent-dim); }
.ctl input[type=text] { font-family: var(--font-mono); }

.presets { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 12px; }
.btn {
  background: transparent; color: var(--text);
  border: 1px solid var(--border); border-radius: 3px;
  padding: 4px 9px; cursor: pointer; font: 12px var(--font-mono);
}
.btn:hover { border-color: var(--accent-dim); color: var(--accent); }
.btn.small { padding: 3px 8px; font-size: 11.5px; }

.chk { display: inline-flex; align-items: center; gap: 7px; font-size: 13px; cursor: pointer; }
.chk input { accent-color: var(--accent); margin: 0; }

/* ---------- Leituras (tipo display de instrumento) ---------- */
.cards {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(168px, 1fr));
  gap: 1px; padding: 1px; margin-bottom: 14px;
}
.card { background: var(--panel); padding: 9px 12px 10px; outline: 1px solid var(--border); }
.card .k { color: var(--muted); font: 500 10px var(--font-mono); text-transform: uppercase; letter-spacing: 1px; }
.card .v { font: 500 18px/1.3 var(--font-mono); font-variant-numeric: tabular-nums; margin-top: 2px; }
.card .s { color: var(--muted); font-size: 11.5px; font-variant-numeric: tabular-nums; line-height: 1.35; }

/* ---------- Equações (caderno) ---------- */
.equation {
  border-left: 2px solid var(--accent);
  padding: 4px 0 4px 16px; margin: 0 0 14px;
  font: 15.5px/1.6 var(--font-serif);
}
.equation .eq { margin: 1px 0; }
.equation .where { color: var(--muted); font: 12.5px/1.5 var(--font-sans); margin-top: 4px; max-width: 900px; }

.notes:empty { display: none; }
.notes { margin-bottom: 12px; }
.notes div {
  border: 1px solid #4a3410; border-left: 3px solid var(--accent);
  background: #1a1408; color: #f3d9a4;
  padding: 7px 12px; font-size: 13px; margin-bottom: 6px; border-radius: 2px;
}

/* ---------- Painéis de gráficos ---------- */
.plots {
  background: var(--panel); border: 1px solid var(--border); border-radius: 3px;
  padding: 8px 12px 6px; margin-bottom: 14px;
}
.plots-bar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; padding: 2px 2px 8px; }
.bar-title {
  font: 600 11px var(--font-mono); text-transform: uppercase; letter-spacing: 1.4px; color: var(--text);
  padding-right: 12px; border-right: 1px solid var(--border);
}
.plots-bar .hint { color: var(--faint); font: 11px var(--font-mono); flex: 1; }

.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 3px; overflow: hidden; }
.seg button {
  background: transparent; color: var(--muted); border: 0; border-right: 1px solid var(--border);
  padding: 4px 10px; cursor: pointer; font: 12px var(--font-mono);
}
.seg button:last-child { border-right: 0; }
.seg button:hover { color: var(--text); }
.seg button.active { background: var(--raise); color: var(--accent); }

/* Velocidade da varredura */
.speed { display: inline-flex; align-items: center; gap: 6px; font: 10.5px var(--font-mono); letter-spacing: .6px; color: var(--muted); }
.speed select { width: auto; margin: 0; padding: 3px 6px; font: 12px var(--font-mono); }
.slowmo { font: 11px var(--font-mono); color: var(--accent); font-variant-numeric: tabular-nums; }

/* RUN/STOP com LED */
.runstop {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 3px;
  padding: 4px 11px; cursor: pointer; font: 600 11.5px var(--font-mono); letter-spacing: 1px;
}
.runstop .led { width: 7px; height: 7px; border-radius: 50%; background: #e0443a; box-shadow: 0 0 6px #e0443a88; }
.runstop.running .led { background: #4fe07a; box-shadow: 0 0 7px #4fe07aaa; }
.runstop:hover { border-color: var(--faint); }

.plots-bar.analyzer { font: 11.5px var(--font-mono); color: var(--muted); gap: 12px; padding-top: 0; }
.plots-bar.analyzer:empty { display: none; }
.plots-bar.analyzer label { display: inline-flex; align-items: center; gap: 6px; text-transform: uppercase; letter-spacing: .6px; font-size: 10.5px; }
.plots-bar.analyzer select { width: auto; margin: 0; padding: 3px 6px; font: 12px var(--font-mono); text-transform: none; }
.plots-bar.analyzer .rbw { color: var(--accent); font-variant-numeric: tabular-nums; }

/* Gráfico individual */
.plot { margin-bottom: 8px; }
.plot-head { display: flex; align-items: baseline; gap: 12px; padding: 0 2px 2px; min-height: 20px; flex-wrap: wrap; }
.plot-title { font-size: 12.5px; font-weight: 500; color: var(--text); }
.plot-legend { display: inline-flex; gap: 12px; color: var(--muted); font: 11.5px var(--font-mono); flex-wrap: wrap; }
.plot-legend i { display: inline-block; width: 14px; height: 2px; margin-right: 5px; vertical-align: middle; }
.plot-readout { margin-left: auto; color: var(--muted); font: 11.5px var(--font-mono); font-variant-numeric: tabular-nums; }
.plot canvas { width: 100%; display: block; cursor: crosshair; touch-action: none; }

/* ---------- Texto explicativo ---------- */
.explain {
  color: var(--muted); font-size: 13.5px; line-height: 1.6;
  border-top: 1px solid var(--border); padding: 6px 2px 0;
}
.explain h4 {
  color: var(--text); margin: 10px 0 6px;
  font: 600 11px var(--font-mono); text-transform: uppercase; letter-spacing: 1.4px;
}
.explain ul { padding-left: 18px; margin: 0; max-width: 980px; }
.explain li { margin: 5px 0; }
.explain li::marker { color: var(--accent); }
.explain b { color: var(--text); font-weight: 600; }

.foot {
  display: flex; gap: 18px; flex-wrap: wrap; margin-top: 28px; padding-top: 12px;
  border-top: 1px solid var(--rule); color: var(--faint); font: 11.5px var(--font-mono);
}
.foot span:first-child { color: var(--muted); }

/* ---------- Telas estreitas ---------- */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .panel { position: static; max-height: none; border-right: 0; border-bottom: 1px solid var(--border); }
  .top { flex-direction: column; align-items: flex-start; position: static; }
  .tabs { flex-wrap: wrap; }
  .main { padding: 12px 14px 24px; }
  .plots-bar .hint { display: none; }
}