/* ============ 可视化画布与控件样式 ============ */

.viz-canvas {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  height: 100%;
  min-height: 420px;
}

/* 画布区域 */
.viz-board {
  position: relative;
  flex: 1;
  min-height: 320px;
  border-radius: 14px;
  overflow: hidden;
  background:
    radial-gradient(
      1200px 500px at 20% -10%,
      color-mix(in srgb, var(--color-icon-blue) 5%, transparent),
      transparent 60%
    ),
    var(--color-surface, light-dark(#ffffff, #171717));
  border: 1px solid var(--color-border);
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.04);
}

.viz-board svg {
  display: block;
  touch-action: none;
  user-select: none;
}

.viz-board-bg {
  fill: transparent;
  cursor: grab;
}

.viz-board-bg:active {
  cursor: grabbing;
}

/* 网格与坐标轴 */
.viz-grid-line {
  stroke: var(--color-border);
  stroke-width: 1;
  opacity: 0.6;
}

.viz-axis {
  stroke: var(--color-text-secondary);
  stroke-width: 1.4;
}

.viz-axis-arrow {
  fill: none;
  stroke: var(--color-text-secondary);
  stroke-width: 1.4;
}

.viz-tick {
  font-size: 11px;
  fill: var(--color-text-secondary);
  font-family: inherit;
  user-select: none;
}

/* 点 */
.viz-point-hit {
  fill: transparent;
  cursor: grab;
}

.viz-point--drag .viz-point-dot {
  cursor: grab;
  stroke: light-dark(#ffffff, #171717);
  stroke-width: 2;
  transition: r 0.12s ease;
}

.viz-point--drag:hover .viz-point-dot {
  r: 8;
}

.viz-point--drag:active .viz-point-hit,
.viz-point--drag:active .viz-point-dot {
  cursor: grabbing;
}

.viz-label {
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  user-select: none;
  pointer-events: none;
}

.viz-angle-text {
  font-size: 12px;
  font-weight: 600;
  user-select: none;
  pointer-events: none;
}

/* ============ 控件条 ============ */

.viz-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-accent-muted) 55%, transparent);
}

/* 滑杆 */
.viz-slider {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--color-text-primary);
}

.viz-slider__label {
  font-weight: 600;
  white-space: nowrap;
}

.viz-slider input[type="range"] {
  width: 150px;
  cursor: pointer;
}

.viz-slider__value {
  min-width: 3ch;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  text-align: right;
}

/* 只读数值 */
.viz-readout {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-size: 13px;
  padding: 4px 10px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--color-accent-muted) 80%, transparent);
}

.viz-readout__label {
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.viz-readout__value {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* 分段切换 */
.viz-toggle-group {
  display: inline-flex;
  border: 1px solid var(--color-border);
  border-radius: 9px;
  overflow: hidden;
}

.viz-toggle {
  appearance: none;
  border: none;
  background: transparent;
  padding: 5px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-family: inherit;
}

.viz-toggle + .viz-toggle {
  border-left: 1px solid var(--color-border);
}

.viz-toggle[data-active] {
  background: var(--color-accent);
  color: light-dark(#ffffff, #171717);
}

/* 3D 画布 */
.viz-board--3d {
  min-height: 380px;
}

.viz-board--3d canvas {
  border-radius: 14px;
}

/* 全屏时的容器背景 */
.viz-canvas:fullscreen {
  background: light-dark(#fafafa, #0a0a0a);
  padding: 20px;
}

/* 课件加载中 */
.viz-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
  color: var(--color-text-secondary);
  font-size: 14px;
}

/* 知识讲解 + 操作提示 */
.viz-notes {
  display: grid;
  gap: 14px;
}

@media (min-width: 720px) {
  .viz-notes {
    grid-template-columns: 1.4fr 1fr;
    gap: 20px;
  }
}

.viz-notes__block {
  min-width: 0;
}

.viz-notes__title {
  margin: 0 0 6px;
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
}

.viz-notes__body {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--color-text-primary);
}