/* ===========================================================
   layout-style.css  --  SRAM 版图（Layout）教学页专用样式
   继承 style.css 中的全局变量与基础组件，不重复已有样式
   =========================================================== */

/* ===== 1. 版图层次颜色变量 ===== */
:root {
  --layer-active: #22c55e;
  --layer-active-dark: #166534;
  --layer-poly: #8b5cf6;
  --layer-poly-dark: #6d28d9;
  --layer-contact: #f59e0b;
  --layer-contact-dark: #d97706;
  --layer-metal1: #3b82f6;
  --layer-metal1-dark: #2563eb;
  --layer-via: #ef4444;
  --layer-via-dark: #dc2626;
  --layer-metal2: #06b6d4;
  --layer-metal2-dark: #0891b2;
  --layer-substrate: #94a3b8;
}

/* ===== 2. 层卡片网格 ===== */
.layer-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  margin-top: 1.5rem;
}

.layer-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.2rem;
  border-left: 4px solid var(--gray-light);
  transition: transform var(--transition), box-shadow var(--transition);
}

.layer-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* 按层着色的左边框 */
.layer-card[data-layer="active"]  { border-left-color: var(--layer-active); }
.layer-card[data-layer="poly"]    { border-left-color: var(--layer-poly); }
.layer-card[data-layer="contact"] { border-left-color: var(--layer-contact); }
.layer-card[data-layer="metal1"]  { border-left-color: var(--layer-metal1); }
.layer-card[data-layer="via"]     { border-left-color: var(--layer-via); }
.layer-card[data-layer="metal2"]  { border-left-color: var(--layer-metal2); }

.layer-card__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.layer-card[data-layer="active"]  .layer-card__title { color: var(--layer-active-dark); }
.layer-card[data-layer="poly"]    .layer-card__title { color: var(--layer-poly-dark); }
.layer-card[data-layer="contact"] .layer-card__title { color: var(--layer-contact-dark); }
.layer-card[data-layer="metal1"]  .layer-card__title { color: var(--layer-metal1-dark); }
.layer-card[data-layer="via"]     .layer-card__title { color: var(--layer-via-dark); }
.layer-card[data-layer="metal2"]  .layer-card__title { color: var(--layer-metal2-dark); }

.layer-card__desc {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.6;
}

.layer-card__tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
  margin-bottom: 0.5rem;
}

.layer-card[data-layer="active"]  .layer-card__tag { background: #dcfce7; color: var(--layer-active-dark); }
.layer-card[data-layer="poly"]    .layer-card__tag { background: #ede9fe; color: var(--layer-poly-dark); }
.layer-card[data-layer="contact"] .layer-card__tag { background: #fef3c7; color: var(--layer-contact-dark); }
.layer-card[data-layer="metal1"]  .layer-card__tag { background: #dbeafe; color: var(--layer-metal1-dark); }
.layer-card[data-layer="via"]     .layer-card__tag { background: #fee2e2; color: var(--layer-via-dark); }
.layer-card[data-layer="metal2"]  .layer-card__tag { background: #cffafe; color: var(--layer-metal2-dark); }

/* ===== 3. 层切换面板 ===== */
.layer-toggle-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
  margin-top: 1.5rem;
}

.layer-check-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.layer-check-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: opacity var(--transition);
}

.layer-check-item.unchecked {
  opacity: 0.45;
}

/* 自定义复选框 -- 使用层颜色 */
.layer-check-item input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--gray-light);
  border-radius: 4px;
  cursor: pointer;
  position: relative;
  transition: var(--transition);
  flex-shrink: 0;
}

.layer-check-item input[type="checkbox"]:checked {
  border-color: transparent;
}

.layer-check-item input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 5px;
  width: 4px;
  height: 8px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* 复选框颜色跟随层 */
.layer-check-item[data-layer="active"]  input:checked { background: var(--layer-active); }
.layer-check-item[data-layer="poly"]    input:checked { background: var(--layer-poly); }
.layer-check-item[data-layer="contact"] input:checked { background: var(--layer-contact); }
.layer-check-item[data-layer="metal1"]  input:checked { background: var(--layer-metal1); }
.layer-check-item[data-layer="via"]     input:checked { background: var(--layer-via); }
.layer-check-item[data-layer="metal2"]  input:checked { background: var(--layer-metal2); }

.layer-check-item label {
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--text);
}

.layer-desc-text {
  margin-top: 0.8rem;
  padding: 0.6rem 0.8rem;
  background: var(--bg-alt);
  border-radius: var(--radius);
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.6;
  min-height: 2.5rem;
}

/* ===== 4. 截面 SVG 区域 ===== */
.cross-section-wrap {
  background: white;
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
}

.cross-section-wrap svg rect,
.cross-section-wrap svg .layer-element {
  transition: opacity 0.4s ease, fill 0.4s ease;
}

/* ===== 5. 通孔演示步骤按钮 ===== */
.via-steps {
  display: flex;
  flex-direction: row;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
}

.via-step-btn {
  background: white;
  border: 2px solid var(--gray-light);
  padding: 0.5rem 1.2rem;
  font-size: 0.9rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 600;
  color: var(--text-light);
  transition: var(--transition);
  position: relative;
}

.via-step-btn:hover {
  border-color: var(--primary-light);
  color: var(--primary);
}

.via-step-btn.active {
  background: var(--layer-via);
  color: white;
  border-color: var(--layer-via);
}

/* 步骤编号小徽章 */
.via-step-btn::before {
  content: attr(data-step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--gray-lighter);
  color: var(--text-light);
  font-size: 0.72rem;
  font-weight: 700;
  margin-right: 0.4rem;
  vertical-align: middle;
}

.via-step-btn.active::before {
  background: rgba(255, 255, 255, 0.3);
  color: white;
}

/* ===== 6. 通孔演示状态说明 ===== */
.via-status {
  background: white;
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
  min-height: 70px;
}

.via-status h3 {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 0.4rem;
}

.via-status p {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* ===== 7. 对称性对比布局 ===== */
.compare-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.layout-example {
  background: white;
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.layout-example h3 {
  text-align: center;
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 0.8rem;
}

.layout-example svg {
  display: block;
  margin: 0 auto;
  max-width: 100%;
}

.layout-good {
  border-left: 4px solid var(--green);
}

.layout-bad {
  border-left: 4px solid var(--red);
}

/* ===== 8. 层堆叠可视化（伪 3D） ===== */
.stack-3d {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding: 1.5rem;
}

.stack-3d .stack-layer {
  width: 80%;
  padding: 0.6rem 1rem;
  text-align: center;
  font-size: 0.82rem;
  font-weight: 600;
  color: white;
  border-radius: 4px;
  position: relative;
  transform: perspective(600px) rotateX(15deg);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
  transition: transform var(--transition), box-shadow var(--transition);
}

.stack-3d .stack-layer:hover {
  transform: perspective(600px) rotateX(5deg) translateY(-4px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

/* ===== 9. 单元版图图例 ===== */
.cell-layout-wrap {
  background: white;
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
}

.cell-layout-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 0.8rem;
  padding: 0.5rem 0;
}

.legend-swatch {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--text-light);
}

.legend-swatch::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* 图例色块通过 class 着色 */
.legend-swatch.swatch-active::before   { background: var(--layer-active); }
.legend-swatch.swatch-poly::before     { background: var(--layer-poly); }
.legend-swatch.swatch-contact::before  { background: var(--layer-contact); }
.legend-swatch.swatch-metal1::before   { background: var(--layer-metal1); }
.legend-swatch.swatch-via::before      { background: var(--layer-via); }
.legend-swatch.swatch-metal2::before   { background: var(--layer-metal2); }
.legend-swatch.swatch-substrate::before { background: var(--layer-substrate); }

/* ===== 10. 版图悬浮提示 ===== */
.layout-tooltip {
  position: absolute;
  background: #1e293b;
  color: white;
  border-radius: var(--radius);
  padding: 0.4rem 0.7rem;
  font-size: 0.78rem;
  line-height: 1.4;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
  white-space: nowrap;
  z-index: 50;
}

.layout-tooltip.visible {
  opacity: 1;
}

/* ===== 11. 通孔电荷流动动画 ===== */
@keyframes viaChargeFlow {
  0%   { offset-distance: 0%; }
  100% { offset-distance: 100%; }
}

/* ===== 12. 层元素显示 / 隐藏 / 高亮动画 ===== */
.layer-element {
  transition: opacity 0.4s ease, filter 0.4s ease;
}

.layer-element.hidden {
  opacity: 0.1;
  filter: grayscale(1);
}

.layer-element.highlight {
  filter: brightness(1.2) drop-shadow(0 0 4px currentColor);
}

/* ===== 13. 响应式调整 ===== */
@media (max-width: 768px) {
  .layer-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .compare-layout {
    grid-template-columns: 1fr;
  }

  .layer-toggle-panel {
    grid-template-columns: 1fr;
  }

  .via-steps {
    flex-wrap: wrap;
  }
}

@media (max-width: 480px) {
  .layer-cards {
    grid-template-columns: 1fr;
  }
}

/* ===== 14. 通孔演示步骤指示器 ===== */
.via-step-indicator {
  display: flex;
  align-items: center;
  gap: 0;
  margin-bottom: 1rem;
}

.via-step-indicator .step-dot {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 700;
  background: var(--gray-lighter);
  color: var(--gray);
  transition: var(--transition);
  flex-shrink: 0;
}

.via-step-indicator .step-dot.active {
  background: var(--layer-via);
  color: white;
}

.via-step-indicator .step-dot.completed {
  background: var(--layer-active);
  color: white;
}

.via-step-indicator .step-line {
  flex: 1;
  height: 2px;
  background: var(--gray-lighter);
  min-width: 16px;
}

.via-step-indicator .step-line.active {
  background: var(--layer-via);
}

.via-step-indicator .step-line.completed {
  background: var(--layer-active);
}