:root {
  color-scheme: dark;
  /* Near-black canvas — electric blue must punch (ref control UI) */
  --bg-0: #020304;
  --bg-1: #050608;
  --bg-2: #0a0c10;
  --bg-3: #10141c;
  --panel: rgba(6, 8, 12, 0.96);
  --panel-border: rgba(90, 140, 210, 0.18);
  --text: #f4f8ff;
  --muted: #8fa0b8;
  --faint: #5a6a82;
  /* Electric blue stack — primary graph language */
  --accent: #3db4ff;
  --accent-2: #1a8cff;
  --accent-3: #7ec8ff;
  --accent-glow: rgba(61, 180, 255, 0.55);
  --accent-soft: rgba(61, 180, 255, 0.16);
  --accent-line: rgba(61, 180, 255, 0.7);
  /* Contrast spark — gold lift, still secondary */
  --spark: #f0c14d;
  --spark-soft: rgba(240, 193, 77, 0.14);
  --spark-line: rgba(240, 193, 77, 0.45);
  --warn: #f5b942;
  --danger: #ff6b7a;
  --ok: #3dde9a;
  --node-bg: rgba(8, 11, 18, 0.98);
  --node-border: rgba(70, 150, 230, 0.38);
  --edge-idle: rgba(50, 150, 255, 0.42);
  --edge-live: rgba(70, 190, 255, 1);
  --shadow: 0 22px 56px rgba(0, 0, 0, 0.72);
  --radius: 14px;
  --font: "Segoe UI", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --mono: "Cascadia Code", "Consolas", ui-monospace, monospace;
  --header-h: 56px;
  --footer-h: 34px;
  --split: 58%;
}

* {
  box-sizing: border-box;
}

html,
body,
#root {
  width: 100%;
  height: 100%;
  margin: 0;
}

body {
  font-family: var(--font);
  background:
    radial-gradient(1100px 520px at 12% -12%, rgba(26, 140, 255, 0.14), transparent 58%),
    radial-gradient(800px 420px at 88% 0%, rgba(61, 180, 255, 0.09), transparent 52%),
    radial-gradient(640px 380px at 76% 10%, rgba(240, 193, 77, 0.04), transparent 50%),
    var(--bg-0);
  color: var(--text);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

button,
input,
textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

.app-shell {
  display: grid;
  grid-template-rows: var(--header-h) 1fr var(--footer-h);
  height: 100%;
  min-height: 0;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, var(--split)) 6px minmax(0, calc(100% - var(--split) - 6px));
  min-height: 0;
  height: 100%;
}

.pane {
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  overflow: hidden;
}

.pane-left {
  border-left: none;
  border-radius: 0 0 0 0;
}

.pane-right {
  border-right: none;
}

.splitter {
  background: linear-gradient(180deg, transparent, rgba(77, 179, 255, 0.28), transparent);
  cursor: col-resize;
  position: relative;
}

.splitter::after {
  content: "";
  position: absolute;
  inset: 0 -3px;
}

.splitter:hover,
.splitter:active {
  background: linear-gradient(180deg, transparent, rgba(77, 179, 255, 0.62), transparent);
}

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--panel-border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent);
}

.pane-title {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.pane-title strong {
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.pane-title span {
  font-size: 11px;
  color: var(--muted);
}

.pane-body {
  flex: 1;
  min-height: 0;
  position: relative;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.02em;
}

.badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--faint);
}

.badge.live .dot {
  background: var(--ok);
  box-shadow: 0 0 10px rgba(52, 211, 153, 0.8);
}

.badge.warn .dot {
  background: var(--warn);
}

.badge.spark {
  border-color: var(--spark-line);
  color: var(--spark);
  background: var(--spark-soft);
}

.mono {
  font-family: var(--mono);
}

.muted {
  color: var(--muted);
}

.faint {
  color: var(--faint);
}