:root {
  --bg: #07110c;
  --bg2: #0c1a12;
  --panel: #0f2418;
  --panel-border: #1e3d2a;
  --copper: #c47a3a;
  --copper-dim: #8a5528;
  --trace: #3d9b5f;
  --trace-hot: #7dff9a;
  --led: #ff3b4a;
  --text: #d8f0df;
  --muted: #7a9a84;
  --accent: #e8b86d;
  --danger: #e85d5d;
  --ok: #4fd67a;
  --font: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", "Consolas", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  overflow: hidden;
}

#app {
  display: grid;
  grid-template-columns: 280px 1fr;
  height: 100%;
}

#sidebar {
  background:
    linear-gradient(180deg, rgba(196, 122, 58, 0.06), transparent 120px),
    var(--bg2);
  border-right: 1px solid var(--panel-border);
  overflow-y: auto;
  padding: 14px 12px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.brand {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 6px 4px 10px;
  border-bottom: 1px solid var(--panel-border);
}

.brand .logo {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 30% 30%, #2a5a3a, #0d2216);
  border: 1px solid var(--copper-dim);
  font-size: 22px;
}

.brand h1 {
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--accent);
}

.brand p {
  font-size: 0.72rem;
  color: var(--muted);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 10px;
}

.panel h2 {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 8px;
}

.palette {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.palette button {
  appearance: none;
  border: 1px solid var(--panel-border);
  background: #0a1a12;
  color: var(--text);
  border-radius: 8px;
  padding: 8px 6px;
  font-size: 0.72rem;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, background 0.15s;
}

.palette button:hover,
.palette button.active {
  border-color: var(--copper);
  background: #142a1c;
}

.palette button .tag {
  display: block;
  color: var(--muted);
  font-size: 0.62rem;
  margin-top: 2px;
}

.tools, .sim-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tool, .sim-row button, .primary {
  appearance: none;
  border: 1px solid var(--panel-border);
  background: #0a1a12;
  color: var(--text);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 0.78rem;
  cursor: pointer;
}

.tool.active, .primary {
  background: linear-gradient(180deg, #2f6a42, #1d4a2e);
  border-color: #3d9b5f;
}

.sim-row button:hover, .tool:hover {
  border-color: var(--copper);
}

.speed {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 8px;
  font-size: 0.72rem;
  color: var(--muted);
}

.speed input, .speed select {
  width: 100%;
  accent-color: var(--trace);
  background: #0a1a12;
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 6px 8px;
  font-size: 0.78rem;
}

.muted { color: var(--muted); font-size: 0.75rem; margin-top: 6px; }

.alerts {
  color: var(--danger);
  font-size: 0.7rem;
  margin-top: 6px;
  max-height: 4.5em;
  overflow: auto;
  line-height: 1.35;
}

#tooltip {
  position: absolute;
  pointer-events: none;
  z-index: 5;
  background: rgba(7, 17, 12, 0.92);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 6px 8px;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--text);
  white-space: pre;
  transform: translate(12px, 12px);
}

#props-dialog {
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  background: var(--panel);
  color: var(--text);
  padding: 14px 16px;
  min-width: min(320px, 90vw);
}
#props-dialog::backdrop { background: rgba(0,0,0,0.55); }
#props-dialog h3 { color: var(--accent); font-size: 0.95rem; margin-bottom: 10px; }
#props-fields label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 8px;
}
#props-fields input[type="number"],
#props-fields input[type="text"],
#props-fields input[type="checkbox"] {
  background: #0a1a12;
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 6px 8px;
}

.tips ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.72rem;
  color: var(--muted);
}

.tips li::before {
  content: "› ";
  color: var(--copper);
}

#workspace {
  position: relative;
  background:
    radial-gradient(ellipse at 20% 10%, rgba(61, 155, 95, 0.08), transparent 50%),
    radial-gradient(ellipse at 80% 90%, rgba(196, 122, 58, 0.07), transparent 45%),
    var(--bg);
  overflow: hidden;
}

#c {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
}

#hud {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 12px;
  display: flex;
  gap: 12px;
  align-items: center;
  pointer-events: none;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  background: rgba(7, 17, 12, 0.72);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 8px 12px;
  backdrop-filter: blur(6px);
}

#hud-tool {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

#hud-info { flex: 1; }
#hud-fps { color: var(--trace); }

@media (max-width: 820px) {
  #app { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
  #sidebar {
    max-height: 38vh;
    border-right: none;
    border-bottom: 1px solid var(--panel-border);
  }
}