:root {
  --ui-bg: rgba(13, 17, 23, 0.66);
  --ui-fg: #e6edf3;
  --ui-muted: #9fb2c7;
  --accent: #3ecf8e;
  --warn: #ffcc66;
}

* {
  box-sizing: border-box;
  user-select: none;
}

#ui-root {
  position: fixed;
  inset: 0;
  pointer-events: none;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, sans-serif;
  color: var(--ui-fg);
}

#hud-top {
  position: absolute;
  left: 12px;
  right: 12px;
  top: 10px;
  display: flex;
  gap: 10px;
  justify-content: center;
  pointer-events: none;
}

#hud-top .metric {
  background: var(--ui-bg);
  padding: 8px 10px;
  border-radius: 8px;
  display: flex;
  gap: 8px;
  align-items: baseline;
  backdrop-filter: blur(6px);
}

#hud-top .metric label {
  color: var(--ui-muted);
  font-size: 12px;
}
#hud-top .metric span {
  font-weight: 700;
}

#hud-right {
  position: absolute;
  right: 12px;
  top: 70px;
  width: 280px;
  pointer-events: none;
}

#hud-right .panel {
  background: var(--ui-bg);
  padding: 10px 12px;
  border-radius: 10px;
  backdrop-filter: blur(6px);
}

#hud-right .panel-title {
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}

#hud-right .row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--ui-fg);
  padding: 4px 0;
}
#hud-right label {
  color: var(--ui-muted);
}

#tool-panel {
  position: absolute;
  left: 12px;
  bottom: 14px;
  width: 320px;
  pointer-events: auto;
  background: var(--ui-bg);
  border-radius: 12px;
  padding: 12px;
  backdrop-filter: blur(6px);
}

#tool-panel .tool-header {
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--accent);
}

#tool-panel .tool-button {
  width: 100%;
  padding: 10px 12px;
  margin: 6px 0;
  border-radius: 10px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--ui-fg);
  font-weight: 600;
  cursor: pointer;
  transition: transform .05s ease-in-out, background .2s;
}
#tool-panel .tool-button:hover { background: rgba(255,255,255,0.12); }
#tool-panel .tool-button.selected {
  outline: 2px solid var(--accent);
  background: rgba(62,207,142,0.18);
}

#tool-panel .tool-footer {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
}

#tool-panel .secondary {
  background: transparent;
  color: var(--ui-muted);
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.18);
  cursor: pointer;
}
#tool-panel .secondary:hover {
  color: var(--ui-fg);
  border-color: rgba(255,255,255,0.3);
}

#tooltip {
  position: absolute;
  bottom: 110px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ui-bg);
  color: var(--ui-fg);
  padding: 8px 12px;
  border-radius: 10px;
  opacity: 0;
  transition: opacity .3s, transform .3s;
  pointer-events: none;
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255,255,255,0.1);
}
#tooltip.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(-6px);
}