:root {
  --primary: #6366f1;
  --primary-light: #818cf8;
  --secondary: #1e293b;
  --accent: #ec4899;
  --accent-light: #f472b6;
  --bg: #f8fafc;
  --card: #ffffff;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0
}

body {
  font-family: "Segoe UI", Roboto, "Microsoft Yahei", sans-serif;
  background: linear-gradient(135deg, #1a2a6c, #b21f1f);
  padding: 20px;
  color: var(--secondary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.container {
  width: 95%;
  max-width: 1200px;
  background: rgba(255, 255, 255, 0.97);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

header {
  padding: 24px;
  background: linear-gradient(90deg, var(--secondary), var(--primary));
  color: white;
  text-align: center;
}

header h1 {
  font-size: 1.6rem;
  margin-bottom: 6px
}

header p {
  opacity: 0.95
}

.content {
  display: flex;
  gap: 12px;
  padding: 20px;
  align-items: flex-start;
}

.triangle-section {
  flex: 3;
  background: linear-gradient(180deg, #f8f9fa, #eef2f7);
  padding: 18px;
  border-right: 2px dashed var(--primary);
  min-height: 520px;
}

.triangle-wrapper {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 480px;
}

/* SVG 覆盖层 */
.connections-svg {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  /* 不阻挡鼠标事件 */
  z-index: 1;
}

/* 数字容器在 SVG 之上 */
.triangle-container {
  position: relative;
  z-index: 2;
  padding: 10px;
  overflow: auto;
}

/* 每一行 */
.pascal-line {
  display: flex;
  align-items: flex-end;
  margin-bottom: 24px;
  width: 100%;
}

/* 显示三角形时的行间距 */
.sierpinski-active .pascal-line {
  margin-bottom: 0px;
}

/* 行号 */
.row-label {
  width: 72px;
  display: flex;
  justify-content: flex-end;
  padding-right: 12px;
  font-weight: 600;
  color: var(--secondary);
}

/* 数字行 */
.pascal-row {
  display: flex;
  justify-content: center;
  flex: 1;
  gap: 10px;
  position: relative;
  padding-bottom: 10px;
  min-height: 70px;
}

/* 数字格子样式 - 默认圆形 */
.pascal-number {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), #2980b9);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.18);
  cursor: pointer;
  position: relative;
  transition: transform .18s ease, box-shadow .18s ease;
}

/* 圆角方形样式 - 用于对称线连接的元素 */
.pascal-number.rounded-square {
  border-radius: 15px;
  background: linear-gradient(135deg, var(--accent), #c0392b);
  box-shadow: 0 0 15px rgba(231, 76, 60, 0.5);
}

/* 六边形样式 */
.pascal-number.hexagon {
  border-radius: 0;
  clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
}

/* 三角形样式 - 用于谢尔宾斯三角的奇数元素 */
.pascal-number.triangle {
  width: 74px;
  height: 74px;
  margin: -5px;
  border-radius: 0;
  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
  background: linear-gradient(135deg, #8e44ad, #9b59b6);
  box-shadow: 0 0 15px rgba(142, 68, 173, 0.5);
}

/* 自然数文本颜色 */
.pascal-number.highlight-natural {
  color: #3366cc;
}

/* 三角数文本颜色 */
.pascal-number.highlight-triangular {
  color: #d324fa;
}

/* 四面体数文本颜色 */
.pascal-number.highlight-tetrahedral {
  color: #cc3366;
}

.pascal-number:hover {
  transform: scale(1.08);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.24);
  background: linear-gradient(135deg, var(--accent), #c0392b);
}

.pascal-number .katex {
  line-height: 1 !important;
}

/* 控制侧栏 */
.controls-container {
  flex: 1;
  min-width: 300px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 6px 18px;
}

.control-panel,
.info-panel {
  background: var(--card);
  padding: 14px;
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

.control-panel h2,
.info-panel h2 {
  margin-bottom: 10px;
  color: var(--secondary)
}

.controls label {
  display: block;
  margin-bottom: 12px;
  font-weight: 600
}

.controls input[type="number"] {
  width: 80px;
  padding: 6px;
  margin-left: 8px
}

.btn-row {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap
}

button {
  padding: 8px 12px;
  border-radius: 8px;
  border: none;
  background: linear-gradient(90deg, var(--primary), #2980b9);
  color: white;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.12);
}

button:active {
  transform: translateY(2px)
}

.info-content {
  font-size: 0.95rem;
  line-height: 1.6
}

.instructions ul {
  padding-left: 18px
}

.katex-display {
  background: white;
  padding: 8px;
  border-radius: 8px;
  overflow: auto
}

/* 高亮动画（点击时） */
.highlight {
  animation: highlightAnim 1s ease;
}

@keyframes highlightAnim {
  0% {
    transform: scale(1)
  }

  50% {
    transform: scale(1.18);
    box-shadow: 0 0 0 8px rgba(231, 76, 60, 0.18)
  }

  100% {
    transform: scale(1)
  }
}

/* 响应式 */
@media (max-width:900px) {
  .content {
    flex-direction: column
  }

  .triangle-section {
    border-right: none;
    border-bottom: 2px dashed var(--primary)
  }

  .controls-container {
    min-width: unset
  }
}



/* 斐波那契数列高亮样式 */
.highlight-fibonacci {
  background-color: rgba(233, 30, 99, 0.3);
  box-shadow: 0 0 8px rgba(233, 30, 99, 0.5);
  animation: fibonacciPulse 1.5s infinite;
}

@keyframes fibonacciPulse {
  0% {
    background-color: rgba(233, 30, 99, 0.3);
    transform: scale(1);
  }
  50% {
    background-color: rgba(233, 30, 99, 0.6);
    transform: scale(1.05);
  }
  100% {
    background-color: rgba(233, 30, 99, 0.3);
    transform: scale(1);
  }
}

/* 自然数高亮样式 */
.highlight-natural {
  background-color: rgba(33, 150, 243, 0.3);
  box-shadow: 0 0 8px rgba(33, 150, 243, 0.5);
  animation: naturalPulse 2s infinite;
}

@keyframes naturalPulse {
  0% {
    background-color: rgba(33, 150, 243, 0.3);
    transform: scale(1);
  }
  50% {
    background-color: rgba(33, 150, 243, 0.6);
    transform: scale(1.05);
  }
  100% {
    background-color: rgba(33, 150, 243, 0.3);
    transform: scale(1);
  }
}

/* 三角数高亮样式 */
.highlight-triangular {
  background-color: rgba(76, 175, 80, 0.3);
  box-shadow: 0 0 8px rgba(76, 175, 80, 0.5);
  animation: triangularPulse 2.5s infinite;
}

@keyframes triangularPulse {
  0% {
    background-color: rgba(76, 175, 80, 0.3);
    transform: scale(1);
  }
  50% {
    background-color: rgba(76, 175, 80, 0.6);
    transform: scale(1.05);
  }
  100% {
    background-color: rgba(76, 175, 80, 0.3);
    transform: scale(1);
  }
}

/* 四面体数高亮样式 */
.highlight-tetrahedral {
  background-color: rgba(156, 39, 176, 0.3);
  box-shadow: 0 0 8px rgba(156, 39, 176, 0.5);
  animation: tetrahedralPulse 3s infinite;
}

@keyframes tetrahedralPulse {
  0% {
    background-color: rgba(156, 39, 176, 0.3);
    transform: scale(1);
  }
  50% {
    background-color: rgba(156, 39, 176, 0.6);
    transform: scale(1.05);
  }
  100% {
    background-color: rgba(156, 39, 176, 0.3);
    transform: scale(1);
  }
}

/* 数学规律高亮文本颜色 */
.natural { color: #27ae60; }
.triangular { color: #8e44ad; }
.tetrahedral { color: #c0392b; }

/* 数学规律信息面板样式 */
.pattern-info {
  background-color: rgba(255, 255, 255, 0.9);
  border-radius: 8px;
  padding: 15px;
  margin-bottom: 20px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.pattern-header {
  padding: 10px 15px;
  border-radius: 6px;
  margin-bottom: 15px;
  text-align: center;
  color: white;
  font-weight: bold;
}

.pattern-header h3 {
  margin: 0;
  font-size: 1.2rem;
}

.pattern-content {
  font-size: 0.95rem;
  line-height: 1.6;
}

.pattern-description {
  margin-bottom: 15px;
  color: #333;
}

.pattern-formula,
.pattern-detailed-formula,
.pattern-example {
  margin-bottom: 15px;
}

.pattern-formula strong,
.pattern-detailed-formula strong,
.pattern-example strong {
  display: block;
  margin-bottom: 5px;
  color: #555;
}

/* 不同数学规律的颜色主题 */
.fibonacci-pattern {
  background-color: #e74c3c;
}

.natural-pattern {
  background-color: #27ae60;
}

.triangular-pattern {
  background-color: #8e44ad;
}

.tetrahedral-pattern {
  background-color: #c0392b;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .pattern-info {
    padding: 10px;
    margin-bottom: 15px;
  }
  
  .pattern-header h3 {
    font-size: 1.1rem;
  }
  
  .pattern-content {
    font-size: 0.9rem;
  }
}


.connection-line {
  stroke: black;
  stroke-width: 1px;
  fill: none;
}

#fib-panel {
  position: absolute;
  top: 0;
  right: -80px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  font-size: 16px;
}

#fib-panel .fib-number {
  margin: 5px 0;
}