/* 数据结构演示 — 复用 demo 布局，补充 DS 专用样式 */

.ds-stage {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  min-height: 280px;
  margin-bottom: 16px;
}

.ds-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 16px;
}

.ds-controls label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.ds-controls input[type="number"],
.ds-controls input[type="text"] {
  width: 72px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 0.875rem;
}

.ds-log {
  margin-top: 12px;
  padding: 10px 12px;
  background: var(--bg-sidebar);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  min-height: 2.4em;
  line-height: 1.5;
}

/* 数组 / 栈 / 队列 — 条形块 */
.ds-bar-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: flex-end;
  justify-content: center;
  min-height: 120px;
  padding: 12px 0;
}

.ds-bar-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.ds-bar {
  min-width: 44px;
  padding: 10px 8px;
  background: var(--primary-soft);
  border: 2px solid var(--primary);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-weight: 600;
  font-size: 0.9rem;
  text-align: center;
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
}

.ds-bar.highlight {
  background: var(--primary);
  color: var(--text-on-primary);
  transform: translateY(-4px);
}

.ds-bar.muted {
  opacity: 0.45;
  border-color: var(--border-strong);
}

.ds-idx {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* 栈 — 竖向 */
.ds-stack-col {
  flex-direction: column-reverse;
  align-items: center;
  min-height: 220px;
  justify-content: flex-start;
}

.ds-stack-col .ds-bar {
  width: 100px;
}

.ds-stack-top {
  font-size: 0.75rem;
  color: var(--warning);
  font-weight: 600;
  margin-bottom: 8px;
}

/* 队列 — 横向带指针 */
.ds-queue-wrap {
  position: relative;
  padding-top: 28px;
}

.ds-queue-ptr {
  position: absolute;
  top: 0;
  font-size: 0.72rem;
  color: var(--accent);
  font-weight: 600;
  transform: translateX(-50%);
}

/* 字符串 */
.ds-char-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  justify-content: center;
}

.ds-char {
  width: 36px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-weight: 600;
  background: var(--bg-elevated);
}

.ds-char.match {
  border-color: var(--success);
  background: rgba(5, 150, 105, 0.15);
}

/* Canvas 容器 */
.ds-canvas-wrap {
  display: flex;
  justify-content: center;
  overflow: auto;
}

.ds-canvas-wrap canvas {
  max-width: 100%;
  border-radius: var(--radius-sm);
}

.ds-vis-panel {
  display: none;
}

.ds-vis-panel.active {
  display: block;
}

.algo-main:has(#ds-vis-panel.active) {
  max-width: 960px;
}