:root {
  --bg: #08090a;
  --panel: #0f1011;
  --surface: #151619;
  --surface-2: #1b1c20;
  --border: rgba(255, 255, 255, 0.08);
  --border-subtle: rgba(255, 255, 255, 0.05);
  --text: #f7f8f8;
  --secondary: #d0d6e0;
  --muted: #8a8f98;
  --dim: #62666d;
  --accent: #7170ff;
  --accent-hover: #828fff;
  --green: #4ade80;
  --yellow: #facc15;
  --red: #fb7185;
  --purple: #c084fc;
}

* { box-sizing: border-box; }

html, body { min-height: 100%; }

body {
  margin: 0;
  background: radial-gradient(circle at 72% 20%, rgba(113,112,255,.08), transparent 35%), var(--bg);
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-feature-settings: "cv01", "ss03";
}

button, input { font: inherit; }

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
}

.control-panel {
  padding: 28px 24px;
  background: rgba(15, 16, 17, .94);
  border-right: 1px solid var(--border-subtle);
  overflow-y: auto;
}

.brand-block { margin-bottom: 28px; }
.eyebrow {
  color: var(--accent-hover);
  font: 500 10px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: .14em;
}

h1, h2, p { margin-top: 0; }
h1 {
  margin: 8px 0 10px;
  font-size: 27px;
  line-height: 1.1;
  font-weight: 510;
  letter-spacing: -.6px;
}
.brand-block p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}
code, .mono { font-family: "SFMono-Regular", Consolas, monospace; }

fieldset {
  margin: 0 0 18px;
  padding: 0;
  border: 0;
}
legend, .legend h2 {
  width: 100%;
  margin-bottom: 9px;
  color: var(--secondary);
  font-size: 12px;
  font-weight: 590;
}
.field-grid { display: grid; gap: 9px; }
.field-grid.two { grid-template-columns: 1fr 1fr; }
label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 11px;
}
input {
  width: 100%;
  min-width: 0;
  padding: 9px 10px;
  color: var(--text);
  background: rgba(255,255,255,.025);
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
}
input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(113,112,255,.15);
}

.derived-value {
  display: flex;
  justify-content: space-between;
  margin-top: 9px;
  padding: 8px 10px;
  color: var(--dim);
  background: rgba(255,255,255,.018);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  font-size: 11px;
}
.derived-value output { color: var(--secondary); font-family: "SFMono-Regular", Consolas, monospace; }

.actions { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
button {
  min-height: 38px;
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  cursor: pointer;
  color: var(--text);
}
button.primary { background: #5e6ad2; border-color: #6874df; }
button.primary:hover { background: var(--accent-hover); }
button.secondary { background: rgba(255,255,255,.03); }
button.secondary:hover { background: rgba(255,255,255,.06); }
.form-error {
  margin: 0 0 12px;
  padding: 9px 10px;
  color: #fecdd3;
  background: rgba(251,113,133,.1);
  border: 1px solid rgba(251,113,133,.24);
  border-radius: 6px;
  font-size: 12px;
}

.legend {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
}
.legend > div { display: flex; align-items: center; gap: 9px; margin: 8px 0; color: var(--muted); font-size: 11px; }
.swatch { width: 8px; height: 8px; border-radius: 50%; flex: 0 0 auto; }
.swatch.convergent { background: #80b59e; opacity: .6; }
.swatch.unresolved { background: #baac78; opacity: .6; }
.swatch.divergent { background: #b98693; opacity: .6; }
.swatch.fixed { background: #7dd3fc; box-shadow: 0 0 0 3px rgba(125,211,252,.14); }
.swatch.orbit { background: #fff1b8; border-radius: 2px; width: 15px; height: 3px; }

.workspace {
  min-width: 0;
  display: flex;
  flex-direction: column;
  padding: 26px 30px 18px;
}
.workspace-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 16px;
}
.workspace-header h2 { margin: 6px 0 0; font-size: 21px; font-weight: 510; letter-spacing: -.3px; }
.status-cluster { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 12px; }
.stage-badge {
  padding: 5px 9px;
  color: #c7d2fe;
  background: rgba(113,112,255,.12);
  border: 1px solid rgba(113,112,255,.22);
  border-radius: 999px;
}

.plot-frame {
  position: relative;
  flex: 1 1 auto;
  min-height: 560px;
  overflow: hidden;
  background: #0b0c0e;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: inset 0 0 28px rgba(0,0,0,.28), 0 8px 28px rgba(0,0,0,.18);
}
.plot-frame canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
#interaction-canvas { cursor: crosshair; touch-action: none; }
#vector-minimap { position: absolute; right: 12px; bottom: 12px; width: min(220px, 36%); aspect-ratio: 1; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; background: #0b0c0e; }
#vector-minimap span { position: absolute; z-index: 1; top: 6px; left: 8px; font-size: 11px; color: var(--muted); pointer-events: none; }
#vector-parameter-canvas { cursor: crosshair; }
.plot-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--dim);
  font-size: 13px;
  pointer-events: none;
}
.plot-empty[hidden] { display: none; }
.plot-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 11px 2px 0;
  color: var(--dim);
  font-size: 11px;
}

@media (max-width: 880px) {
  .app-shell { grid-template-columns: 1fr; }
  .control-panel { border-right: 0; border-bottom: 1px solid var(--border); }
  .workspace { min-height: 720px; padding: 22px 16px; }
  .plot-frame { min-height: 520px; }
}

/* Mode and presentation-only two-plane explorer. */
[hidden] { display: none !important; }
select { width: 100%; padding: 10px; color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: 6px; font: inherit; }
.mode-menu { margin-bottom: 22px; }
.help { color: var(--muted); font-size: 12px; line-height: 1.6; }
.point-entry { display: grid; gap: 9px; margin: 18px 0; }
.point-entry button:disabled { opacity: .5; cursor: wait; }
#explorer-form .actions { margin-top: 12px; }
.explorer-plots { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; }
.explorer-plots h3 { display: flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 38px; font-size: 13px; font-weight: 500; color: var(--secondary); }
.explorer-frame { position: relative; aspect-ratio: 1; overflow: hidden; border: 1px solid var(--border); border-radius: 12px; background: #0b0c0e; }
.explorer-frame canvas { display: block; width: 100%; height: 100%; position: absolute; inset: 0; }
#parameter-canvas { cursor: crosshair; }
#explorer-status { font-size: 12px; color: var(--muted); }
.selection-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 12px 0; font: 11px/1.6 monospace; }
.selection-row button { min-height: 30px; padding: 5px; font-size: 10px; }
@media (max-width: 1100px) { .explorer-plots { grid-template-columns: 1fr; } }

@media (max-width: 520px) {
  .field-grid.two { grid-template-columns: 1fr; }
  .workspace-header { align-items: flex-start; gap: 14px; flex-direction: column; }
  .status-cluster { width: 100%; justify-content: space-between; }
  .plot-footer { flex-direction: column; gap: 5px; }
}