/* ===========================================================
   苏教版二年级数学下册 · 第六单元《两、三位数的加法和减法》
   动手互动实验室专属样式
   所有选择器均收拢在 .b1lab-wrap.b6lab-wrap 独立作用域内
   严格遵循：无外网链接、保证 ≥44px 触控热区、支持 375px 窄屏与减少动态效果
   =========================================================== */
/* 本章配色：主色统一为公共的薄荷绿，思维挑战用紫色（色值同 b1-lab.css） */
.b1lab-wrap.b6lab-wrap {
  --b6-primary: #18B28E;
  --b6-primary-dark: #0F8A6D;
  --b6-primary-light: #E6FBF5;
  --b6-coral: #E11D48;
  --b6-coral-light: #FFE4E6;
  --b6-blue: #0284C7;
  --b6-blue-dark: #0369A1;
  --b6-blue-light: #E0F2FE;
  --b6-emerald: #059669;
  --b6-emerald-light: #D1FAE5;
  --b6-amber: #D97706;
  --b6-amber-light: #FEF3C7;
  --b6-purple: #7C5CFA;
  --b6-purple-light: #EFEAFF;
  --b6-ink: #1E293B;
  --b6-slate: #64748B;
  --b6-line: #CBD5E1;
  --b6-card-bg: #FFFFFF;
  --b6-radius: 18px;
}

.b1lab-wrap.b6lab-wrap [tabindex]:focus-visible {
  outline: 3px solid #2563EB;
  outline-offset: 2px;
}

/* 舞台内的工具栏：重置、撤销、重做、提示（按钮用公共的 .btn-tool） */
.b1lab-wrap.b6lab-wrap .b6-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1.5px dashed #E2E8F0;
}

.b1lab-wrap.b6lab-wrap .b6-tools-left {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.b1lab-wrap.b6lab-wrap .b6-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
  background: var(--b6-primary-light);
  color: var(--b6-primary-dark);
  border: 1.5px solid #7FD9BF;
}

.b1lab-wrap.b6lab-wrap.wisdom-mode .b6-status-pill {
  background: var(--b6-purple-light);
  color: var(--b6-purple);
  border-color: #C9BCFF;
}

/* 舞台内各题型通用容器 */
.b1lab-wrap.b6lab-wrap .b6-board {
  background: #FAFAFA;
  border: 2px solid #E2E8F0;
  border-radius: 16px;
  padding: 14px;
  margin-bottom: 14px;
}

/* 提示条 */
.b1lab-wrap.b6lab-wrap .b6-hint-banner {
  background: #E6FBF5;
  border-left: 4px solid var(--b6-primary);
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 12px;
  font-size: 14.5px;
  line-height: 1.5;
  color: #0F5E4A;
  display: flex;
  align-items: center;
  gap: 8px;
}

.b1lab-wrap.b6lab-wrap.wisdom-mode .b6-hint-banner {
  background: #EFEAFF;
  border-left-color: var(--b6-purple);
  color: #3B2A99;
}

/* 竖式计算排版系统 (Column Arithmetic) */
.b1lab-wrap.b6lab-wrap .vertical-math-box {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  background: #FFFFFF;
  border: 2px solid #BDEFE0;
  border-radius: 16px;
  padding: 14px 18px;
  box-shadow: 0 4px 12px rgba(24, 178, 142, 0.08);
  margin: 0 auto;
}

.b1lab-wrap.b6lab-wrap .vmath-grid {
  display: grid;
  grid-template-columns: 36px repeat(4, 46px);
  row-gap: 4px;
  column-gap: 4px;
  align-items: center;
  justify-items: center;
  font-family: "SF Pro Rounded", "Comic Sans MS", "PingFang SC", system-ui, sans-serif;
  font-size: 24px;
  font-weight: 800;
  color: #1E293B;
}

.b1lab-wrap.b6lab-wrap .vmath-header {
  font-size: 13px;
  font-weight: 800;
  color: #94A3B8;
  padding-bottom: 2px;
}

.b1lab-wrap.b6lab-wrap .vmath-carry-row,
.b1lab-wrap.b6lab-wrap .vmath-borrow-row {
  min-height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 900;
}

.b1lab-wrap.b6lab-wrap .vmath-carry-dot {
  color: #18B28E;
  background: #E6FBF5;
  border-radius: 999px;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 4px rgba(24, 178, 142, 0.25);
  animation: b6PopIn 0.3s ease;
}

.b1lab-wrap.b6lab-wrap .vmath-borrow-dot {
  color: #DC2626;
  font-size: 26px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  animation: b6PopIn 0.3s ease;
}

.b1lab-wrap.b6lab-wrap .vmath-borrow-btn {
  background: #FEF2F2;
  border: 1.5px dashed #F87171;
  color: #EF4444;
  font-size: 20px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  min-height: 28px;
  border-radius: 999px;
  cursor: pointer;
  touch-action: manipulation;
  transition: all 0.15s ease;
  padding: 0;
}

.b1lab-wrap.b6lab-wrap .vmath-borrow-btn:hover {
  background: #FEE2E2;
  border-color: #DC2626;
  transform: scale(1.1);
}

.b1lab-wrap.b6lab-wrap .vmath-borrow-btn:focus-visible {
  outline: 3px solid #DC2626;
  outline-offset: 2px;
}

.b1lab-wrap.b6lab-wrap .vmath-borrow-btn.dot-active {
  background: #DC2626;
  border: 1.5px solid #DC2626;
  color: #FFFFFF;
  font-size: 26px;
  animation: b6PopIn 0.3s ease;
}

.b1lab-wrap.b6lab-wrap .vmath-op {
  font-size: 24px;
  font-weight: 900;
  color: var(--b6-primary);
}

.b1lab-wrap.b6lab-wrap .vmath-line {
  grid-column: 1 / -1;
  width: 100%;
  height: 3px;
  background: #334155;
  border-radius: 2px;
  margin: 4px 0;
}

.b1lab-wrap.b6lab-wrap .vmath-cell {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
}

.b1lab-wrap.b6lab-wrap .vmath-input-cell {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed #CBD5E1;
  border-radius: 10px;
  background: #F8FAFC;
  cursor: pointer;
  font-size: 24px;
  font-weight: 900;
  color: var(--b6-primary-dark);
  transition: all 0.15s ease;
}

.b1lab-wrap.b6lab-wrap .vmath-input-cell.active {
  border-color: var(--b6-primary);
  background: #E6FBF5;
  box-shadow: 0 0 0 3px rgba(24, 178, 142, 0.2);
}

.b1lab-wrap.b6lab-wrap .vmath-input-cell.filled {
  border-style: solid;
  border-color: #7FD9BF;
  background: #E6FBF5;
}

/* B1: 计数棒与数位板工坊 */
.b1lab-wrap.b6lab-wrap .b1-stick-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: center;
  padding: 10px;
  background: #FFFFFF;
  border: 1.5px solid #FED7AA;
  border-radius: 14px;
  min-height: 60px;
}

.b1lab-wrap.b6lab-wrap .bundle-stick {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 52px;
  background: linear-gradient(180deg, #FDBA74 0%, #EA580C 100%);
  border-radius: 8px;
  color: #FFFFFF;
  font-size: 11px;
  font-weight: 900;
  box-shadow: 0 2px 4px rgba(234, 88, 12, 0.3);
}

.b1lab-wrap.b6lab-wrap .hundred-flat {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, #FDE047 0%, #CA8A04 100%);
  border: 2px solid #A16207;
  border-radius: 10px;
  color: #713F12;
  font-size: 13px;
  font-weight: 900;
  box-shadow: 0 3px 8px rgba(202, 138, 4, 0.35);
  animation: b6Glow 1.2s ease-in-out infinite alternate;
}

/* B2: 估算天平与购物比较条 */
.b1lab-wrap.b6lab-wrap .b2-estimate-board {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.b1lab-wrap.b6lab-wrap .b2-items-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  width: 100%;
}

.b1lab-wrap.b6lab-wrap .b2-item-card {
  flex: 1 1 150px;
  max-width: 220px;
  background: #FFFFFF;
  border: 2px solid #E2E8F0;
  border-radius: 14px;
  padding: 10px;
  text-align: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.b1lab-wrap.b6lab-wrap .b2-scale-box {
  width: 100%;
  max-width: 440px;
  background: #FFFFFF;
  border: 2px solid #E2E8F0;
  border-radius: 16px;
  padding: 14px;
  text-align: center;
}

.b1lab-wrap.b6lab-wrap .b2-scale-beam {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px;
  background: #F8FAFC;
  border-radius: 12px;
  margin-top: 8px;
}

/* B5: 双向镜像天平 */
.b1lab-wrap.b6lab-wrap .b5-balance-arena {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.b1lab-wrap.b6lab-wrap .b5-pan {
  flex: 1 1 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #FFFFFF;
  border: 2px solid #E2E8F0;
  border-radius: 16px;
  padding: 12px;
}

.b1lab-wrap.b6lab-wrap .b5-pan.matched {
  border-color: #86EFAC;
  background: #F0FDF4;
}

/* B8: 逆向拼图拼合机 */
.b1lab-wrap.b6lab-wrap .b8-puzzle-box {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 14px;
}

.b1lab-wrap.b6lab-wrap .b8-puzzle-piece {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-radius: 12px;
  background: #E0F2FE;
  border: 2px solid #38BDF8;
  color: #0369A1;
  font-size: 16px;
  font-weight: 800;
  box-shadow: 0 2px 6px rgba(2, 132, 199, 0.15);
}

/* W1: 凑整泡泡连线 */
.b1lab-wrap.b6lab-wrap .w1-bubble-arena {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  align-items: center;
  padding: 14px;
}

.b1lab-wrap.b6lab-wrap .w1-bubble {
  min-height: 52px;
  min-width: 72px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 2.5px solid #C9BCFF;
  background: #EFEAFF;
  color: #5B38DF;
  font-size: 20px;
  font-weight: 900;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(124, 92, 250, 0.15);
  transition: all 0.2s ease;
}

.b1lab-wrap.b6lab-wrap .w1-bubble.selected {
  background: #7C5CFA;
  color: #FFFFFF;
  border-color: #5B21B6;
  transform: scale(1.08);
}

.b1lab-wrap.b6lab-wrap .w1-bubble.merged {
  background: #FDE047;
  color: #713F12;
  border-color: #EAB308;
  animation: b6PopIn 0.3s ease;
}

/* W2: 破墨迹数谜 */
.b1lab-wrap.b6lab-wrap .w2-ink-box {
  width: 44px;
  height: 44px;
  background: #1E293B;
  color: #F8FAFC;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 900;
  cursor: pointer;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.5);
}

.b1lab-wrap.b6lab-wrap .w2-ink-box.solved {
  background: #DC2626;
  color: #FFFFFF;
}

/* 数字键盘 (Keypad) */
.b1lab-wrap.b6lab-wrap .b6-keypad {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 12px;
}

.b1lab-wrap.b6lab-wrap .b6-key {
  min-height: 44px;
  min-width: 44px;
  padding: 6px 12px;
  border-radius: 10px;
  border: 1.5px solid #CBD5E1;
  background: #FFFFFF;
  color: #1E293B;
  font-size: 18px;
  font-weight: 800;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
  transition: all 0.15s ease;
}

.b1lab-wrap.b6lab-wrap .b6-key:hover {
  background: #F1F5F9;
  border-color: #94A3B8;
}

.b1lab-wrap.b6lab-wrap .b6-key.action-key {
  background: #E6FBF5;
  color: var(--b6-primary-dark);
  border-color: #7FD9BF;
}

/* 反馈条的样子用公共的 .feedback-msg；这里只管空的时候不占位，以及答对的绿色版本 */
.b1lab-wrap.b6lab-wrap .feedback-msg:empty {
  display: none;
}

.b1lab-wrap.b6lab-wrap .feedback-msg.ok {
  background: #F0FDF4;
  border-color: #86EFAC;
  color: #166534;
}

/* 选项按钮：外观用公共的 .btn-choice，这里只管排版 */
.b1lab-wrap.b6lab-wrap .choices-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 14px;
}

.b1lab-wrap.b6lab-wrap .choice-btn {
  width: 100%;
  min-width: 44px;
  line-height: 1.4;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 10px;
}

.b1lab-wrap.b6lab-wrap .choice-marker {
  width: 24px;
  height: 24px;
  border-radius: 999px;
  border: 2px solid #94A3B8;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 800;
  color: #64748B;
  flex-shrink: 0;
}

/* 动画特效定义 */
@keyframes b6PopIn {
  0% { transform: scale(0.92); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes b6Glow {
  0% { box-shadow: 0 0 6px rgba(234, 88, 12, 0.3); }
  100% { box-shadow: 0 0 16px rgba(234, 88, 12, 0.75); }
}

/* 响应用户系统偏好：减少动态效果 */
@media (prefers-reduced-motion: reduce) {
  .b1lab-wrap.b6lab-wrap *,
  .b1lab-wrap.b6lab-wrap *::before,
  .b1lab-wrap.b6lab-wrap *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* 移动端 375px 窄屏适配规范 */
@media (max-width: 600px) {
  .b1lab-wrap.b6lab-wrap .vmath-grid {
    grid-template-columns: 28px repeat(4, 38px);
    font-size: 20px;
  }
  .b1lab-wrap.b6lab-wrap .vmath-cell,
  .b1lab-wrap.b6lab-wrap .vmath-input-cell {
    width: 38px;
    height: 44px;
    font-size: 20px;
  }
  .b1lab-wrap.b6lab-wrap .vmath-op {
    font-size: 20px;
  }
  .b1lab-wrap.b6lab-wrap .vertical-math-box {
    padding: 10px 8px;
  }
  .b1lab-wrap.b6lab-wrap .b6-toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }
  .b1lab-wrap.b6lab-wrap .b6-tools-left {
    justify-content: center;
  }
  .b1lab-wrap.b6lab-wrap .b6-status-pill {
    align-self: center;
  }
}