/* ---------------------------------------------------------------------------
   Nirnay — theme and layout.

   The custom properties on :root are the single source of truth for colour.
   src/ui/plots.js reads them off document.documentElement with getComputedStyle,
   so the canvases and the chrome around them always agree.
   --------------------------------------------------------------------------- */

:root {
  color-scheme: light;

  /* Plot palette — also consumed by src/ui/plots.js. */
  --bg: #ffffff;        /* paper: plot ground and panel fill */
  --panel: #ffffff;
  --grid: #e7eaee;      /* hairline graph rule */
  --axis: #98a1ac;
  --fg: #171b21;
  --muted: #616b78;
  --accent: #1f4e9c;    /* ink-blue pen: the response */
  --accent-2: #b03a2e;  /* oxide-red pen: reference and limits */
  --warn: #9a6b1f;      /* ochre: tolerance band */
  --ok: #1b7a4b;        /* green: pass */
  --danger: #b03a2e;

  /* Shell-only tokens. */
  --panel-2: #f4f5f7;   /* desk: page ground behind the paper */
  --line: #dbdfe5;
  --line-soft: #eceef1;
  --radius: 2px;

  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", SFMono-Regular, Menlo, Consolas,
          "Liberation Mono", monospace;
}


*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  background: var(--panel-2);   /* was: var(--bg) */
  color: var(--fg);
  font: 14px/1.5 var(--sans);
  -webkit-font-smoothing: antialiased;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

code {
  font-family: var(--mono);
  font-size: 0.92em;
  color: var(--accent);
  background: var(--panel-2);
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  padding: 0 4px;
}

/* --------------------------------------------------------------------- header */

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px 24px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
}

.topbar h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.tagline {
  margin: 5px 0 0;
  max-width: 84ch;
  color: var(--muted);
  font-size: 12.5px;
}

.status {
  margin: 2px 0 0;
  flex: 0 0 auto;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel-2);
  color: var(--muted);
  font: 11.5px/1 var(--mono);
  letter-spacing: 0.01em;
}

.status::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--muted);
  vertical-align: -1px;
}

.status[data-state="on"] {
  color: var(--ok);
  border-color: color-mix(in srgb, var(--ok) 40%, var(--line));
}

.status[data-state="on"]::before {
  background: var(--ok);
}

.status[data-state="error"] {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 45%, var(--line));
}

.status[data-state="error"]::before {
  background: var(--danger);
}

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

.bench {
  display: grid;
  gap: 14px;
  padding: 14px;
  grid-template-columns: 320px minmax(0, 1fr) 320px;
  grid-template-areas: "controls plots readout";
  align-items: start;
}

.col-controls {
  grid-area: controls;
}

.col-plots {
  grid-area: plots;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-content: start;
}

.col-readout {
  grid-area: readout;
}

.col-controls,
.col-readout {
  display: grid;
  gap: 14px;
  align-content: start;
}

/* Two sidebars plus two plots side by side stops fitting well below this. */
@media (max-width: 1280px) {
  .bench {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    grid-template-areas:
      "controls readout"
      "plots plots";
  }
}

@media (max-width: 820px) {
  .bench {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "controls"
      "plots"
      "readout";
  }

  .col-plots {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* --------------------------------------------------------------------- panels */

.panel {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.panel > h2 {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.panel-sub {
  margin: -4px 0 12px;
  color: var(--muted);
  font: 12px/1.4 var(--mono);
}

.foot {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 11.5px;
  line-height: 1.45;
}

.field-error {
  margin: 8px 0 0;
  color: var(--danger);
  font-size: 12px;
  line-height: 1.4;
}

/* --------------------------------------------------------------------- inputs */

.field + .field,
.gain + .gain,
.gain + .field {
  margin-top: 12px;
}

.field > label,
.gain > label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 5px;
  font-size: 12px;
  font-weight: 500;
}

/* The symbol and its subscript have to be one flex item, or space-between pushes
   them to opposite ends of the label. */
.gain-name {
  white-space: nowrap;
}

.hint,
.qual {
  color: var(--muted);
  font-size: 11px;
  font-weight: 400;
}

.gain-inputs {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 88px;
  gap: 10px;
  align-items: center;
}

input[type="number"],
input[type="text"],
select {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel-2);
  color: var(--fg);
  font: 13px/1.3 var(--mono);
  font-variant-numeric: tabular-nums;
}

input[type="number"]:hover,
input[type="text"]:hover,
select:hover {
  border-color: var(--axis);
}

button {
  width: 100%;
  margin-top: 12px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel-2);
  color: var(--fg);
  font: 500 12.5px var(--sans);
  cursor: pointer;
}

button:hover {
  border-color: var(--axis);
}

button:active {
  background: #080d13;
}

.btn-primary {
  border-color: color-mix(in srgb, var(--accent) 50%, var(--line));
  color: var(--accent);
}

.btn-primary:hover {
  border-color: var(--accent);
}

/* Range inputs need per-engine pseudo-elements; the rules cannot be merged, because a
   selector list containing one unknown pseudo-element drops the whole rule. */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 20px;
  margin: 0;
  background: transparent;
  cursor: ew-resize;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 2px;
  background: var(--grid);
}

input[type="range"]::-moz-range-track {
  height: 4px;
  border-radius: 2px;
  background: var(--grid);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  margin-top: -5px;
  border: 2px solid var(--panel);
  border-radius: 50%;
  background: var(--accent);
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border: 2px solid var(--panel);
  border-radius: 50%;
  background: var(--accent);
}

/* Set by src/ui/controls.js when the gain sits outside the slider's 0..50 span, so a
   pinned thumb never reads as the real value. */
input[type="range"][data-clamped="true"]::-webkit-slider-thumb {
  background: var(--warn);
}

input[type="range"][data-clamped="true"]::-moz-range-thumb {
  background: var(--warn);
}

/* ---------------------------------------------------------------------- plots */

.plot-card {
  margin: 0;
  padding: 10px 12px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.plot-wide {
  grid-column: 1 / -1;
}

.plot-card figcaption {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 3px 10px;
  margin-bottom: 8px;
}

.plot-card h2 {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.cap-note {
  color: var(--muted);
  font-size: 11px;
}

canvas {
  display: block;
  width: 100%;
  border-radius: 6px;
  background: var(--panel-2);
}

#step-canvas {
  height: 252px;
}

#bode-canvas,
#pz-canvas {
  height: 320px;
}

/* -------------------------------------------------------------------- metrics */

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 4px;
}

.badge {
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: 5px;
  font: 600 10.5px/1.2 var(--mono);
  letter-spacing: 0.1em;
  color: var(--muted);
}

.badge[data-stable="true"] {
  color: var(--ok);
  border-color: color-mix(in srgb, var(--ok) 45%, var(--line));
  background: color-mix(in srgb, var(--ok) 12%, transparent);
}

.badge[data-stable="false"] {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 50%, var(--line));
  background: color-mix(in srgb, var(--danger) 14%, transparent);
}

.badge[data-pass="true"] {
  color: var(--ok);
  border-color: color-mix(in srgb, var(--ok) 45%, var(--line));
  background: color-mix(in srgb, var(--ok) 12%, transparent);
}

.badge[data-pass="false"] {
  color: var(--warn);
  border-color: color-mix(in srgb, var(--warn) 40%, var(--line));
  background: color-mix(in srgb, var(--warn) 10%, transparent);
}

.metric-group > h3 {
  margin: 14px 0 6px;
  padding-top: 10px;
  border-top: 1px solid var(--line-soft);
  color: var(--muted);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.metrics {
  margin: 0;
}

.metric {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 10px;
  padding: 3px 0;
}

.metric dt {
  color: var(--muted);
  font-size: 12px;
}

.metric dd {
  display: flex;
  align-items: baseline;
  justify-content: flex-end;
  gap: 6px;
  margin: 0;
}

.metric .value {
  color: var(--fg);
  font: 13px/1.3 var(--mono);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.metric .unit {
  min-width: 3.4em;
  color: var(--muted);
  font-size: 10.5px;
  text-align: left;
}

/* The dominant pole prints as "a + bj" and needs the whole row. */
.metric-wide {
  grid-template-columns: minmax(0, 1fr);
}

.metric-wide dd {
  justify-content: flex-start;
}

.metric-wide .unit {
  min-width: 0;
}

.chip {
  padding: 3px 6px;
  border-radius: 4px;
  background: var(--grid);
  color: var(--muted);
  font: 600 9.5px/1.2 var(--mono);
  letter-spacing: 0.1em;
}

.chip[data-pass="true"] {
  background: var(--ok);
  color: #04160f;
}

.chip[data-pass="false"] {
  background: var(--danger);
  color: #1c0406;
}

/* ------------------------------------------------------------------ agent log */

.log {
  max-height: 250px;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.log-empty {
  margin: 0;
  color: var(--muted);
  font-size: 11.5px;
  line-height: 1.45;
}

.log-line {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 8px;
  margin: 0;
  padding: 5px 0 5px 8px;
  border-left: 2px solid transparent;
  border-bottom: 1px solid var(--line-soft);
  font: 11.5px/1.45 var(--mono);
}

/* Newest entry only — a static marker rather than an animation, so it reads cleanly on video. */
.log-line:first-child {
  border-left-color: var(--accent);
}

.log-line:last-child {
  border-bottom: 0;
}

.log-time {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.log-msg {
  color: var(--fg);
  overflow-wrap: anywhere;
}

/* ----------------------------------------------------------------- agent note */

.panel-note p {
  margin: 0 0 9px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.panel-note p:last-child {
  margin-bottom: 0;
}

.panel-note strong {
  color: var(--fg);
  font-weight: 600;
}