:root {
  --bg-panel: rgba(18, 24, 29, 0.84);
  --bg-panel-border: rgba(255, 255, 255, 0.13);
  --text-main: #f3f6f8;
  --text-muted: #9eb0bd;
  --accent: #e0533c;
  --accent-soft: rgba(224, 83, 60, 0.22);
  --accent-green: #4fb477;
  --accent-amber: #f0a23b;
  --radius: 12px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #0d151b;
  color: var(--text-main);
  font-family: var(--font-sans);
}

#app {
  position: relative;
  width: 100vw;
  height: 100vh;
}

#sim-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
}

#sim-canvas.cursor-throw {
  cursor: crosshair;
}

#sim-canvas.cursor-shock {
  cursor: cell;
}

#sim-canvas.cursor-grabbing {
  cursor: grabbing;
}

/* Top bar */
.hud-top {
  position: absolute;
  top: 12px;
  left: 14px;
  right: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 18px;
  background: var(--bg-panel);
  backdrop-filter: blur(12px);
  border: 1px solid var(--bg-panel-border);
  border-radius: var(--radius);
  pointer-events: auto;
  z-index: 10;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #ff8269, #c92d1d);
  box-shadow: 0 0 12px rgba(224, 83, 60, 0.7);
}

.brand h1 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand .subtitle {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.telemetry {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.stat-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.stat-val {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
}

/* Side panels */
.hud-panel {
  position: absolute;
  top: 76px;
  width: 280px;
  max-height: calc(100vh - 90px);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px;
  background: var(--bg-panel);
  backdrop-filter: blur(12px);
  border: 1px solid var(--bg-panel-border);
  border-radius: var(--radius);
  z-index: 10;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.38);
}

.hud-left {
  left: 14px;
}

.hud-right {
  right: 14px;
}

.panel-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.panel-section:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.panel-section h2 {
  font-size: 0.73rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
}

/* Tool selector */
.tool-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}

.tool-btn {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 8px 10px 8px 34px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tool-btn:hover {
  background: rgba(255, 255, 255, 0.09);
}

.tool-btn.active {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.tool-key {
  position: absolute;
  left: 9px;
  top: 9px;
  width: 18px;
  height: 18px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.12);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.tool-btn.active .tool-key {
  background: var(--accent);
}

.tool-name {
  font-size: 0.82rem;
  font-weight: 600;
}

.tool-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.25;
}

/* Pills */
.pill-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
}

.pill {
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.11);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  font-size: 0.74rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.14s ease;
}

.pill:hover {
  background: rgba(255, 255, 255, 0.1);
}

.pill.active {
  background: rgba(79, 180, 119, 0.25);
  border-color: var(--accent-green);
  color: #fff;
}

/* Action buttons */
.action-row {
  display: flex;
  gap: 6px;
}

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

.action-btn {
  flex: 1;
  padding: 7px 9px;
  border-radius: 7px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(79, 180, 119, 0.22);
  color: #fff;
  font-size: 0.76rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.action-btn:hover {
  background: rgba(79, 180, 119, 0.36);
}

.action-btn.warn {
  background: rgba(240, 162, 59, 0.24);
  border-color: rgba(240, 162, 59, 0.55);
}

.action-btn.warn:hover {
  background: rgba(240, 162, 59, 0.4);
}

.action-btn.secondary {
  background: rgba(255, 255, 255, 0.06);
}

.action-btn.secondary:hover {
  background: rgba(255, 255, 255, 0.14);
}

/* Sliders */
.slider-row {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.slider-head {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
}

.slider-head span {
  color: var(--text-muted);
}

.slider-head strong {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-main);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent-green);
  cursor: pointer;
}

/* Checkboxes */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.77rem;
  color: var(--text-main);
  cursor: pointer;
}

.toggle-row input {
  accent-color: var(--accent);
  cursor: pointer;
}

.hint-box {
  background: rgba(255, 255, 255, 0.04);
  padding: 8px 10px !important;
  border-radius: 8px;
  font-size: 0.73rem;
  line-height: 1.38;
  color: var(--text-muted);
}

.hint-box strong {
  color: #fff;
}

@media (max-width: 1024px) {
  .hud-panel {
    width: 240px;
  }
  .brand .subtitle {
    display: none;
  }
}