/* BioUni+ overlay draw / highlight tool — fixed viewport canvas + FAB toolbar */

#drawCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 90040;
  pointer-events: none;
  touch-action: none;
  cursor: crosshair;
}

#drawCanvas.is-active {
  pointer-events: auto;
}

body.draw-mode-active {
  -webkit-user-select: none;
  user-select: none;
}

.draw-tool-fab {
  position: fixed;
  right: max(16px, env(safe-area-inset-right, 0px));
  bottom: max(16px, env(safe-area-inset-bottom, 0px));
  z-index: 90085;
  width: 52px;
  height: 52px;
  border: none;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #004e9f;
  color: #fff;
  box-shadow: 0 4px 18px rgba(0, 78, 159, 0.35);
  cursor: pointer;
  transition: background 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
}

.draw-tool-fab:hover {
  background: #0066cc;
  box-shadow: 0 6px 22px rgba(0, 78, 159, 0.42);
}

.draw-tool-fab:active {
  transform: scale(0.96);
}

.draw-tool-fab.is-active {
  background: #006d37;
  box-shadow: 0 4px 18px rgba(0, 109, 55, 0.35);
}

.draw-tool-fab:focus-visible {
  outline: 2px solid #004e9f;
  outline-offset: 3px;
}

.draw-tool-fab svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.draw-tool-toolbar {
  position: fixed;
  right: max(16px, env(safe-area-inset-right, 0px));
  bottom: calc(max(16px, env(safe-area-inset-bottom, 0px)) + 64px);
  z-index: 90086;
  width: min(280px, calc(100vw - 32px));
  padding: 12px;
  border-radius: 16px;
  border: 1px solid rgba(193, 198, 213, 0.55);
  background: rgba(255, 255, 255, 0.96);
  color: #191c1e;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.draw-tool-toolbar[hidden] {
  display: none;
}

.draw-tool-toolbar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.draw-tool-toolbar__title {
  margin: 0;
  font: 600 14px/1.2 system-ui, "Segoe UI", "Noto Sans TC", sans-serif;
}

.draw-tool-close {
  appearance: none;
  border: none;
  background: transparent;
  color: #414753;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
}

.draw-tool-close:hover {
  background: rgba(0, 0, 0, 0.06);
}

.draw-tool-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.draw-tool-tools .draw-tool-btn {
  flex: 1 1 calc(33.333% - 4px);
  min-width: 0;
  padding: 6px 4px;
  font-size: 11px;
}

.draw-tool-btn {
  flex: 1;
  appearance: none;
  border: 1.5px solid rgba(193, 198, 213, 0.7);
  border-radius: 10px;
  background: #f7f9fb;
  color: #414753;
  padding: 7px 8px;
  font: 600 12px/1.2 system-ui, "Segoe UI", sans-serif;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.draw-tool-btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  flex-shrink: 0;
}

.draw-tool-btn.is-active {
  border-color: #004e9f;
  background: #d7e3ff;
  color: #004e9f;
}

.draw-tool-colors {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 5px;
  margin-bottom: 10px;
}

.color-dot {
  appearance: none;
  width: 100%;
  aspect-ratio: 1;
  border-radius: 999px;
  border: 2px solid transparent;
  padding: 0;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.12);
}

.color-dot.active {
  border-color: #004e9f;
  box-shadow: 0 0 0 2px #fff, 0 0 0 4px #004e9f;
}

.color-dot[data-color="#ffffff"],
.color-dot[data-color="#facc15"],
.color-dot[data-color="#fcd34d"] {
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.2);
}

.draw-tool-width {
  margin-bottom: 10px;
}

.draw-tool-width label {
  display: block;
  margin-bottom: 6px;
  font: 500 12px/1.3 system-ui, "Segoe UI", sans-serif;
  color: #414753;
}

.draw-tool-width input[type="range"],
.draw-tool-opacity input[type="range"] {
  width: 100%;
  accent-color: #004e9f;
}

.draw-tool-opacity {
  margin-bottom: 10px;
}

.draw-tool-opacity label {
  display: block;
  margin-bottom: 6px;
  font: 500 12px/1.3 system-ui, "Segoe UI", "Noto Sans TC", sans-serif;
  color: #414753;
}

#drawCanvas.draw-canvas--eraser {
  cursor: cell;
}

.draw-tool-actions {
  display: flex;
  gap: 6px;
}

.draw-tool-action {
  flex: 1;
  appearance: none;
  border: 1.5px solid rgba(193, 198, 213, 0.7);
  border-radius: 10px;
  background: #fff;
  color: #414753;
  padding: 8px 10px;
  font: 600 12px/1.2 system-ui, "Segoe UI", sans-serif;
  cursor: pointer;
}

.draw-tool-action--danger {
  color: #ba1a1a;
  border-color: rgba(186, 26, 26, 0.35);
}

.draw-tool-action:hover {
  background: #f2f4f6;
}

@media (prefers-reduced-motion: reduce) {
  .draw-tool-fab,
  .draw-tool-btn,
  .draw-tool-action {
    transition: none;
  }
}

@media (max-width: 480px) {
  .draw-tool-colors {
    grid-template-columns: repeat(8, 1fr);
  }

  .draw-tool-toolbar {
    width: min(260px, calc(100vw - 24px));
    right: max(12px, env(safe-area-inset-right, 0px));
  }
}