/* LeonSim Workbench
   Layout: a one-screen engineering workbench - spec on the left, the part in the middle, the
   answer (KPIs) and display controls on the right; on phones the 3D view comes first and the
   panels become tabs underneath.  Neutrals are cool steel greys; the accent is the copper of a
   cold plate.  Field colour ramps (inferno, viridis) live in colormaps.js. */
:root {
  --bg: #eef1f4;          /* page ground: cool steel white */
  --panel: #fbfcfd;       /* panes */
  --ink: #17202a;         /* primary text */
  --muted: #586472;       /* secondary text, axis labels */
  --line: #d6dce3;        /* hairlines, input borders */
  --accent: #a8501f;      /* copper: primary action, focus */
  --accent-ink: #ffffff;
  --accent-soft: #f6e7dd;
  --viewport: #e3e8ed;    /* 3D background (read by viewer.js) */
  --solid: #9aa4af;       /* part in material view */
  --fluid: #2f7fc8;       /* coolant in material view */
  --stream: #22313f;      /* streamlines when not coloured by speed */
  --ok: #2c7a4b; --ok-soft: #e1f1e7;
  --warn: #9a6400; --warn-soft: #fbf0d9;
  --crit: #b3261e; --crit-soft: #fae3e1;
  --font-display: "Barlow Semi Condensed", "Arial Narrow", "Roboto Condensed", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --step--1: 0.78rem; --step-0: 0.875rem; --step-1: 1rem; --step-2: 1.25rem; --step-3: 1.6rem;
  --radius: 6px;
  --gutter: 16px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f141a; --panel: #151c24; --ink: #e5eaef; --muted: #98a4b1; --line: #29333e;
    --accent: #e0864f; --accent-ink: #1a1009; --accent-soft: #3a2416;
    --viewport: #0b1015; --solid: #8c96a1; --fluid: #4d9de6; --stream: #dfe7ee;
    --ok: #63c58b; --ok-soft: #14301f; --warn: #e2b04a; --warn-soft: #33270d; --crit: #f0857c; --crit-soft: #3a1714;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f141a; --panel: #151c24; --ink: #e5eaef; --muted: #98a4b1; --line: #29333e;
  --accent: #e0864f; --accent-ink: #1a1009; --accent-soft: #3a2416;
  --viewport: #0b1015; --solid: #8c96a1; --fluid: #4d9de6; --stream: #dfe7ee;
  --ok: #63c58b; --ok-soft: #14301f; --warn: #e2b04a; --warn-soft: #33270d; --crit: #f0857c; --crit-soft: #3a1714;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 var(--step-0)/1.45 var(--font-body);
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }

/* ---------------------------------------------------------------- frame */
.app {
  height: 100%;
  display: grid;
  grid-template-columns: minmax(300px, 25rem) minmax(0, 1fr) minmax(280px, 21rem);
  grid-template-rows: auto minmax(0, 1fr);
  grid-template-areas: "bar bar bar" "spec view results";
}
.bar {
  grid-area: bar;
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 8px var(--gutter);
  border-bottom: 1px solid var(--line); background: var(--panel);
}
.brand { display: flex; align-items: baseline; gap: 8px; margin-right: 8px; }
.brand b { font: 600 var(--step-2)/1 var(--font-display); letter-spacing: 0.01em; }
.brand span { font: 500 var(--step--1)/1 var(--font-display); text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); }
.bar .case-pick { display: flex; align-items: center; gap: 8px; min-width: 0; }
.bar label, .label {
  font: 600 var(--step--1)/1 var(--font-display); text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted);
}
.bar select { max-width: 16rem; }
.status { margin-left: auto; display: flex; align-items: center; gap: 8px; min-width: 0; color: var(--muted); font-size: var(--step--1); }
.status .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); flex: none; }
.status[data-state="running"] .dot, .status[data-state="queued"] .dot { background: var(--accent); animation: pulse 1.2s ease-in-out infinite; }
.status[data-state="done"] .dot { background: var(--ok); }
.status[data-state="error"] .dot { background: var(--crit); }
@keyframes pulse { 50% { opacity: 0.3; } }
@media (prefers-reduced-motion: reduce) { .status .dot { animation: none !important; } }
.mode-chip { font: 600 var(--step--1)/1 var(--font-display); letter-spacing: 0.08em; text-transform: uppercase;
  padding: 4px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }

.pane { background: var(--panel); overflow: auto; min-width: 0; }
.pane.spec { grid-area: spec; border-right: 1px solid var(--line); }
.pane.results { grid-area: results; border-left: 1px solid var(--line); }
.pane section { padding: 14px var(--gutter); border-bottom: 1px solid var(--line); display: grid; gap: 10px; min-width: 0; }
.pane h2 {
  margin: 0; font: 600 var(--step-1)/1.1 var(--font-display); letter-spacing: 0.06em; text-transform: uppercase;
  display: flex; align-items: center; justify-content: space-between; gap: 8px; text-wrap: balance;
}
.pane h2 small { font: 500 var(--step--1)/1 var(--font-body); letter-spacing: 0; text-transform: none; color: var(--muted); }
.hint { margin: 0; color: var(--muted); font-size: var(--step--1); }

/* ---------------------------------------------------------------- controls */
select, input[type="number"], input[type="text"] {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 6px 8px; min-width: 0;
}
input[type="range"] { accent-color: var(--accent); width: 100%; }
.row > input[type="range"].grow { flex: 1 1 6rem; width: auto; min-width: 0; }
input[type="checkbox"] { accent-color: var(--accent); width: 16px; height: 16px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 1px solid var(--line); background: var(--panel); border-radius: var(--radius);
  padding: 7px 12px; cursor: pointer; font-weight: 500; text-decoration: none; color: var(--ink);
}
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.btn.primary:hover { filter: brightness(1.06); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; filter: none; }
.btn.small { padding: 4px 8px; font-size: var(--step--1); }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.row > .grow { flex: 1 1 8rem; min-width: 0; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.seg button { border: 0; background: transparent; padding: 5px 10px; cursor: pointer; font: 600 var(--step--1)/1.2 var(--font-display);
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.seg button + button { border-left: 1px solid var(--line); }
.seg button[aria-pressed="true"] { background: var(--accent-soft); color: var(--accent); }
.check { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.check[aria-disabled="true"] { opacity: 0.45; cursor: default; }

/* spec editor */
.editor-wrap { position: relative; }
#spec {
  width: 100%; min-height: 18rem; height: 42vh; resize: vertical;
  font: 400 12.5px/1.55 var(--font-mono); tab-size: 2; white-space: pre; overflow: auto;
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 12px;
}
#spec[readonly] { opacity: 0.9; }
.msg { font-size: var(--step--1); padding: 6px 10px; border-radius: var(--radius); display: flex; gap: 8px; align-items: flex-start; }
.msg::before { font: 700 var(--step--1)/1.4 var(--font-mono); }
.msg.ok { background: var(--ok-soft); color: var(--ok); }
.msg.ok::before { content: "✓"; }
.msg.err { background: var(--crit-soft); color: var(--crit); }
.msg.err::before { content: "!"; }
.msg.info { background: var(--accent-soft); color: var(--accent); }
.msg.info::before { content: "i"; }
.params { display: grid; grid-template-columns: minmax(0, 1fr) 7.5rem; gap: 6px 10px; align-items: center; }
.params label { font-family: var(--font-mono); font-size: var(--step--1); overflow-wrap: anywhere; }
.params input { width: 100%; font-variant-numeric: tabular-nums; }
.params input.changed { border-color: var(--accent); background: var(--accent-soft); }
#log:empty { display: none; }
#log {
  margin: 0; max-height: 10rem; overflow: auto; font: 400 11.5px/1.5 var(--font-mono); color: var(--muted);
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 10px; white-space: pre-wrap;
}

/* ---------------------------------------------------------------- viewport */
.view { grid-area: view; position: relative; min-width: 0; min-height: 0; background: var(--viewport); }
#viewport { position: absolute; inset: 0; }
#viewport canvas { display: block; width: 100%; height: 100%; touch-action: none; }
.overlay { position: absolute; pointer-events: none; }
.overlay > * { pointer-events: auto; }
.ov-top { top: 10px; left: 10px; right: 10px; display: flex; justify-content: space-between; gap: 8px; flex-wrap: wrap; pointer-events: none; }
.ov-chip {
  background: color-mix(in srgb, var(--panel) 88%, transparent); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 6px 10px; font-size: var(--step--1); backdrop-filter: blur(6px);
}
.ov-title b { font: 600 var(--step-1)/1.2 var(--font-display); letter-spacing: 0.02em; }
.ov-title span { color: var(--muted); font-variant-numeric: tabular-nums; }
.views { display: flex; gap: 4px; }
.views .btn { padding: 4px 8px; font: 600 var(--step--1)/1.2 var(--font-display); letter-spacing: 0.06em; text-transform: uppercase;
  background: color-mix(in srgb, var(--panel) 88%, transparent); }
.legend { bottom: 12px; left: 10px; width: min(20rem, calc(100% - 20px)); }
.legend .ov-chip { display: grid; gap: 4px; }
.legend .lt { display: flex; justify-content: space-between; gap: 8px; }
.legend .lt b { font: 600 var(--step--1)/1.2 var(--font-display); letter-spacing: 0.06em; text-transform: uppercase; }
.legend canvas { width: 100%; height: 10px; border-radius: 2px; display: block; }
.legend .ticks { display: flex; justify-content: space-between; font: 400 11px/1.2 var(--font-mono); color: var(--muted); font-variant-numeric: tabular-nums; }
.probe { bottom: 12px; right: 10px; max-width: min(18rem, calc(100% - 20px)); font-variant-numeric: tabular-nums; }
.probe .ov-chip { font-family: var(--font-mono); font-size: 11.5px; }
.probe .pick-acts { display: flex; gap: 4px; margin-top: 6px; flex-wrap: wrap; font-family: var(--font-body); }
.probe .pick-acts .btn { padding: 3px 8px; }
.triad { top: 54px; right: 10px; width: 64px; height: 64px; pointer-events: none; }
.triad line { stroke-width: 2; stroke-linecap: round; }
.triad text { font: 600 11px var(--font-display); }
.veil { inset: 0; display: grid; place-items: center; background: color-mix(in srgb, var(--viewport) 70%, transparent); }
.veil .ov-chip { font-size: var(--step-0); max-width: 26rem; text-align: center; }
.fallback-img { max-width: 100%; max-height: 100%; }

/* ---------------------------------------------------------------- results */
.kpis { display: grid; gap: 14px; }
.kgroup { display: grid; gap: 2px; }
.kgroup h3 { margin: 0 0 4px; font: 600 var(--step--1)/1 var(--font-display); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted);
  display: flex; align-items: center; gap: 8px; }
.kgroup h3::after { content: ""; flex: 1; border-top: 1px solid var(--line); }
.kv { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; align-items: baseline; padding: 3px 0; }
.kv dt { color: var(--muted); min-width: 0; }
.kv dd { margin: 0; font: 500 var(--step-0)/1.3 var(--font-mono); font-variant-numeric: tabular-nums; text-align: right; }
.kv dd .u { color: var(--muted); font-weight: 400; margin-left: 3px; }
.kv dd .pm { color: var(--accent); font-weight: 400; margin-left: 4px; font-size: var(--step--1); }
.kv.hero dd { font: 600 var(--step-2)/1.1 var(--font-mono); }
.kv.stack { grid-template-columns: minmax(0, 1fr); gap: 2px; }
.kv.stack dd { text-align: left; font-size: var(--step--1); color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.pill { display: inline-flex; align-items: center; gap: 5px; font: 600 var(--step--1)/1 var(--font-display); letter-spacing: 0.06em; text-transform: uppercase;
  padding: 3px 7px; border-radius: 999px; }
.pill.ok { background: var(--ok-soft); color: var(--ok); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.crit { background: var(--crit-soft); color: var(--crit); }
.tablewrap { overflow-x: auto; }
table.modes { width: 100%; border-collapse: collapse; font: 400 var(--step--1)/1.3 var(--font-mono); font-variant-numeric: tabular-nums; }
table.modes th { text-align: left; font: 600 var(--step--1)/1.2 var(--font-display); letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted);
  padding: 4px 6px; border-bottom: 1px solid var(--line); }
table.modes td { padding: 4px 6px; border-bottom: 1px solid var(--line); white-space: nowrap; }
table.modes td:nth-child(2) { text-align: right; }
table.modes tbody tr { cursor: pointer; }
table.modes tbody tr:hover { background: var(--bg); }
table.modes tbody tr.on { background: var(--accent-soft); color: var(--accent); }
.timebar { display: flex; height: 8px; border-radius: 2px; overflow: hidden; background: var(--line); gap: 2px; }
.timebar i { display: block; height: 100%; background: var(--accent); opacity: 0.85; }
.timebar i:nth-child(2n) { opacity: 0.55; }
.timelegend { display: flex; flex-wrap: wrap; gap: 4px 12px; font-size: var(--step--1); color: var(--muted); font-variant-numeric: tabular-nums; }
.warnings { margin: 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.warnings li { background: var(--warn-soft); color: var(--warn); border-radius: var(--radius); padding: 6px 10px; font-size: var(--step--1);
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 8px; }
.warnings li::before { content: "▲"; font-size: 10px; line-height: 1.8; }
.files { display: flex; flex-wrap: wrap; gap: 6px; }
.disp-grid { display: grid; grid-template-columns: 6.5rem minmax(0, 1fr); gap: 8px 10px; align-items: center; }
.disp-grid .label { line-height: 1.3; }
.small-num { font: 400 var(--step--1)/1 var(--font-mono); color: var(--muted); font-variant-numeric: tabular-nums; min-width: 3.5rem; text-align: right; }

/* ---------------------------------------------------------------- phone and tablet */
.tabs { display: none; }
@media (max-width: 1100px) and (min-width: 761px) {
  .app { grid-template-columns: minmax(280px, 22rem) minmax(0, 1fr); grid-template-rows: auto minmax(0, 1fr) auto;
    grid-template-areas: "bar bar" "spec view" "spec results"; }
  .pane.results { border-left: 0; border-top: 1px solid var(--line); max-height: 40vh; }
}
@media (max-width: 760px) {
  html, body { height: auto; }
  .app { height: auto; display: flex; flex-direction: column; }
  .view { height: 58vh; min-height: 300px; order: 1; }
  .bar { order: 0; }
  .tabs { order: 2; display: flex; gap: 0; background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: env(safe-area-inset-top, 0px); z-index: 2; }
  .tabs button { flex: 1; border: 0; background: transparent; padding: 10px 4px; font: 600 var(--step--1)/1 var(--font-display); letter-spacing: 0.1em;
    text-transform: uppercase; color: var(--muted); border-bottom: 2px solid transparent; cursor: pointer; }
  .tabs button[aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }
  .pane { order: 3; border: 0 !important; overflow: visible; }
  .app[data-tab="spec"] .pane.results, .app[data-tab="results"] .pane.spec, .app[data-tab="display"] .pane.spec { display: none; }
  .app[data-tab="results"] #sec-display, .app[data-tab="display"] #sec-kpis, .app[data-tab="display"] #sec-warnings, .app[data-tab="display"] #sec-files { display: none; }
  #spec { height: 50vh; }
  .status { margin-left: 0; width: 100%; }
  .bar select { max-width: 100%; }
  .triad { top: auto; bottom: 64px; }
  .legend { width: min(14rem, calc(100% - 20px)); }
  .probe { bottom: 70px; }
}

/* harmonic response: frequency response chart */
svg.frf { width: 100%; height: auto; color: var(--accent, currentColor); margin-top: 6px; }
/* sweep table: the variant on display */
table.sweep tbody tr[aria-selected="true"] td { background: var(--accent-soft); }
table.sweep td, table.sweep th { white-space: nowrap; }