/* 全局重置和基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --neon-pink: #ff0080;
  --neon-cyan: #00ffff;
  --neon-yellow: #ffff00;
  --neon-green: #39ff14;
  --neon-purple: #bf00ff;
  --neon-orange: #ff6600;
  --dark-bg: #0a0a0f;
  --dark-secondary: #151520;
  --dark-tertiary: #1e1e2e;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --gradient-1: linear-gradient(135deg, #ff0080 0%, #ff6600 100%);
  --gradient-2: linear-gradient(135deg, #00ffff 0%, #ff0080 100%);
  --gradient-3: linear-gradient(135deg, #bf00ff 0%, #00ffff 100%);
}

body {
  font-family: 'Orbitron', 'Rajdhani', 'Noto Sans SC', sans-serif;
  background: var(--dark-bg);
  color: var(--text-primary);
  line-height: 1.8;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(0, 255, 255, 0.03) 2px,
      rgba(0, 255, 255, 0.03) 4px
    );
  pointer-events: none;
  z-index: 9999;
}

/* 导航栏样式 */
.navbar {
  background: rgba(10, 10, 15, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--neon-cyan);
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
}

.navbar-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-logo {
  font-size: 28px;
  font-weight: 900;
  color: var(--neon-pink);
  text-decoration: none;
  text-shadow: 0 0 10px var(--neon-pink), 0 0 20px var(--neon-pink);
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: 'Orbitron', sans-serif;
}

.navbar-logo .panda-icon {
  font-size: 36px;
  animation: pandaBounce 2s ease-in-out infinite;
}

@keyframes pandaBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: 30px;
}

.navbar-menu li a {
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 16px;
  padding: 8px 16px;
  border-radius: 8px;
  transition: all 0.3s ease;
  position: relative;
}

.navbar-menu li a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--gradient-2);
  transition: width 0.3s ease;
}

.navbar-menu li a:hover {
  color: var(--neon-cyan);
  text-shadow: 0 0 10px var(--neon-cyan);
}

.navbar-menu li a:hover::before {
  width: 80%;
}

.navbar-toggle {
  display: none;
  background: none;
  border: 2px solid var(--neon-cyan);
  font-size: 24px;
  cursor: pointer;
  color: var(--neon-cyan);
  padding: 8px;
  border-radius: 8px;
}

.theme-toggle {
  background: none;
  border: 2px solid var(--neon-purple);
  font-size: 20px;
  cursor: pointer;
  color: var(--neon-purple);
  padding: 8px 12px;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background: var(--neon-purple);
  color: var(--dark-bg);
  box-shadow: 0 0 20px var(--neon-purple);
}

/* 英雄区域 */
.hero {
  padding: 80px 0;
  text-align: center;
  background: linear-gradient(180deg, var(--dark-bg) 0%, var(--dark-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 50%, rgba(255, 0, 128, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero h1 {
  font-size: 64px;
  font-weight: 900;
  margin-bottom: 20px;
  background: linear-gradient(90deg, var(--neon-pink), var(--neon-cyan), var(--neon-yellow));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  font-family: 'Orbitron', sans-serif;
  animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
  from { filter: drop-shadow(0 0 20px rgba(255, 0, 128, 0.5)); }
  to { filter: drop-shadow(0 0 40px rgba(0, 255, 255, 0.5)); }
}

.hero p {
  font-size: 20px;
  max-width: 700px;
  margin: 0 auto 40px;
  color: var(--text-secondary);
}

.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  text-align: center;
  font-family: 'Rajdhani', sans-serif;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.btn-primary {
  background: var(--gradient-1);
  color: white;
  border: 2px solid var(--neon-pink);
  box-shadow: 0 0 20px rgba(255, 0, 128, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(255, 0, 128, 0.6);
}

.btn-secondary {
  background: var(--gradient-2);
  color: var(--dark-bg);
  border: 2px solid var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.4);
}

.btn-secondary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 255, 255, 0.6);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--neon-cyan);
  color: var(--neon-cyan);
}

.btn-outline:hover {
  background: rgba(0, 255, 255, 0.1);
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.4);
}

.btn-small {
  padding: 8px 16px;
  font-size: 14px;
}

/* 卡片样式 */
.card {
  background: var(--dark-secondary);
  border-radius: 16px;
  padding: 30px;
  margin-bottom: 30px;
  border: 1px solid rgba(0, 255, 255, 0.2);
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.1);
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--neon-cyan);
  box-shadow: 0 10px 40px rgba(0, 255, 255, 0.2);
}

.card h2, .card h3 {
  color: var(--neon-cyan);
  margin-bottom: 20px;
  font-family: 'Orbitron', sans-serif;
}

/* 进度信息 */
.progress-info {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 30px;
}

.progress-item {
  text-align: center;
  padding: 20px;
  background: var(--dark-tertiary);
  border-radius: 12px;
  border: 1px solid rgba(255, 0, 128, 0.3);
}

.progress-label {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.progress-value {
  font-size: 32px;
  font-weight: 900;
  color: var(--neon-pink);
  text-shadow: 0 0 10px var(--neon-pink);
  font-family: 'Orbitron', sans-serif;
}

.progress-container {
  width: 100%;
  height: 12px;
  background: var(--dark-tertiary);
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(0, 255, 255, 0.3);
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--neon-pink), var(--neon-cyan));
  border-radius: 20px;
  transition: width 0.5s ease;
  box-shadow: 0 0 10px var(--neon-pink);
}

/* 学习路径 */
.learning-path {
  margin: 60px 0;
}

.learning-path h2 {
  text-align: center;
  margin-bottom: 40px;
  font-size: 36px;
  color: var(--neon-yellow);
  text-shadow: 0 0 20px var(--neon-yellow);
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 25px;
}

.path-item {
  background: var(--dark-secondary);
  border-radius: 16px;
  padding: 25px;
  border: 2px solid transparent;
  transition: all 0.3s ease;
  text-align: center;
}

.path-item:hover {
  transform: translateY(-5px);
  border-color: var(--neon-cyan);
  box-shadow: 0 10px 30px rgba(0, 255, 255, 0.3);
}

.path-icon {
  font-size: 48px;
  margin-bottom: 15px;
}

.path-item h3 {
  color: var(--neon-pink);
  margin-bottom: 10px;
  font-family: 'Orbitron', sans-serif;
  font-size: 18px;
}

.path-item p {
  color: var(--text-secondary);
  font-size: 14px;
}

/* 旧版时间线布局（已弃用，保留兼容）*/
.path-timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 0;
}

.path-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--neon-pink), var(--neon-cyan), var(--neon-yellow));
  border-radius: 2px;
  box-shadow: 0 0 20px rgba(255, 0, 128, 0.5);
}

.path-content {
  flex: 1;
  max-width: 380px;
  padding: 25px;
  background: var(--dark-secondary);
  border-radius: 16px;
  border: 2px solid var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.2);
  margin: 0 40px;
  position: relative;
  transition: all 0.3s ease;
}

.path-content:hover {
  transform: scale(1.05);
  box-shadow: 0 0 40px rgba(0, 255, 255, 0.4);
}

.path-dot {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--neon-cyan);
  border: 4px solid var(--dark-bg);
  box-shadow: 0 0 20px var(--neon-cyan);
  z-index: 1;
}

.path-item.completed .path-dot {
  background: var(--neon-green);
  box-shadow: 0 0 20px var(--neon-green);
}

/* 数据集卡片 */
.datasets-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 25px;
  margin: 30px 0;
}

.dataset-card {
  background: var(--dark-secondary);
  border-radius: 16px;
  padding: 25px;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
}

.dataset-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0, 255, 255, 0.1), transparent);
  transition: left 0.5s ease;
}

.dataset-card:hover::before {
  left: 100%;
}

.dataset-card:hover {
  transform: translateY(-5px);
  border-color: var(--neon-cyan);
  box-shadow: 0 10px 30px rgba(0, 255, 255, 0.3);
}

.dataset-card.active {
  border-color: var(--neon-green);
  box-shadow: 0 0 30px rgba(57, 255, 20, 0.3);
}

.dataset-name {
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--neon-yellow);
  font-family: 'Orbitron', sans-serif;
  font-size: 18px;
}

.dataset-description {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 15px;
}

.dataset-fields {
  padding-top: 15px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 13px;
  color: var(--neon-cyan);
}

/* 代码编辑器 */
.editor-container {
  margin: 30px 0;
  background: var(--dark-secondary);
  border-radius: 16px;
  overflow: hidden;
  border: 2px solid var(--neon-purple);
  box-shadow: 0 0 30px rgba(191, 0, 255, 0.3);
}

.editor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--dark-tertiary);
  padding: 15px 25px;
  border-bottom: 2px solid var(--neon-purple);
}

.editor-title {
  font-weight: 700;
  color: var(--neon-purple);
  font-family: 'Orbitron', sans-serif;
}

.editor-actions {
  display: flex;
  gap: 12px;
}

#editor, #challenge-editor {
  height: 450px;
  font-size: 15px;
}

.CodeMirror {
  height: 100%;
  font-family: 'Fira Code', 'Consolas', monospace;
  font-size: 15px;
  background: var(--dark-tertiary) !important;
}

.CodeMirror-gutters {
  background: var(--dark-tertiary) !important;
  border-right: 1px solid var(--neon-purple) !important;
}

.editor-output {
  margin-top: 0;
  background: var(--dark-tertiary);
  padding: 25px;
  min-height: 250px;
  border-top: 2px solid var(--neon-purple);
  font-family: 'Fira Code', monospace;
  font-size: 14px;
}

.editor-output h3 {
  color: var(--neon-green);
  margin-bottom: 15px;
  font-family: 'Orbitron', sans-serif;
}

.editor-output table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
}

.editor-output th, .editor-output td {
  padding: 12px;
  text-align: left;
  border: 1px solid rgba(0, 255, 255, 0.3);
}

.editor-output th {
  background: var(--dark-bg);
  color: var(--neon-cyan);
  font-weight: 600;
}

.editor-output tr:hover {
  background: rgba(0, 255, 255, 0.05);
}

/* 代码示例 */
.examples-container {
  margin: 30px 0;
}

.examples-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 25px;
  flex-wrap: wrap;
}

.example-tab {
  padding: 10px 20px;
  background: var(--dark-secondary);
  border: 2px solid var(--neon-orange);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--neon-orange);
  font-weight: 600;
  font-family: 'Rajdhani', sans-serif;
}

.example-tab:hover {
  background: rgba(255, 102, 0, 0.1);
  transform: translateY(-2px);
}

.example-tab.active {
  background: var(--neon-orange);
  color: var(--dark-bg);
  box-shadow: 0 0 20px rgba(255, 102, 0, 0.4);
}

.examples-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 20px;
}

.example-item {
  background: var(--dark-secondary);
  border-radius: 12px;
  padding: 20px;
  border: 1px solid rgba(255, 102, 0, 0.3);
  transition: all 0.3s ease;
}

.example-item:hover {
  transform: translateY(-3px);
  border-color: var(--neon-orange);
  box-shadow: 0 10px 30px rgba(255, 102, 0, 0.2);
}

.example-title {
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--neon-orange);
  font-family: 'Orbitron', sans-serif;
}

.example-code {
  font-family: 'Fira Code', monospace;
  font-size: 13px;
  background: var(--dark-bg);
  padding: 15px;
  border-radius: 8px;
  margin-bottom: 15px;
  overflow-x: auto;
  color: var(--neon-green);
  border: 1px solid rgba(57, 255, 20, 0.2);
}

/* 函数速查表 */
.cheatsheet-container {
  position: sticky;
  top: 100px;
  background: var(--dark-secondary);
  border-radius: 16px;
  padding: 25px;
  border: 2px solid var(--neon-yellow);
  box-shadow: 0 0 20px rgba(255, 255, 0, 0.2);
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.cheatsheet-title {
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--neon-yellow);
  font-family: 'Orbitron', sans-serif;
  font-size: 20px;
}

.cheatsheet-search {
  margin-bottom: 20px;
}

.cheatsheet-search input {
  width: 100%;
  padding: 12px 15px;
  background: var(--dark-tertiary);
  border: 2px solid rgba(255, 255, 0, 0.3);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: 'Fira Code', monospace;
  font-size: 14px;
  transition: all 0.3s ease;
}

.cheatsheet-search input:focus {
  outline: none;
  border-color: var(--neon-yellow);
  box-shadow: 0 0 15px rgba(255, 255, 0, 0.3);
}

.cheatsheet-search input::placeholder {
  color: var(--text-secondary);
}

.cheatsheet-category {
  margin-bottom: 20px;
}

.cheatsheet-category-title {
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--neon-yellow);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px;
  background: var(--dark-tertiary);
  border-radius: 8px;
  transition: all 0.3s ease;
}

.cheatsheet-category-title:hover {
  background: rgba(255, 255, 0, 0.1);
}

.cheatsheet-functions {
  list-style: none;
  margin-left: 10px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.cheatsheet-functions.expanded {
  max-height: 600px;
}

.cheatsheet-function {
  margin-bottom: 8px;
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 6px;
  transition: all 0.2s ease;
  color: var(--text-secondary);
  font-size: 14px;
  font-family: 'Fira Code', monospace;
}

.cheatsheet-function:hover {
  background: var(--dark-tertiary);
  color: var(--neon-cyan);
  padding-left: 18px;
}

/* 挑战卡片 */
.challenges-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 25px;
  margin: 30px 0;
}

.challenge-card {
  background: var(--dark-secondary);
  border-radius: 16px;
  padding: 25px;
  transition: all 0.3s ease;
  cursor: pointer;
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
}

.challenge-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-1);
}

.challenge-card:hover {
  transform: translateY(-5px);
  border-color: var(--neon-pink);
  box-shadow: 0 10px 30px rgba(255, 0, 128, 0.3);
}

.challenge-card.completed {
  border-color: var(--neon-green);
}

.challenge-card.completed::before {
  background: var(--neon-green);
}

.challenge-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.challenge-title {
  font-weight: 700;
  color: var(--text-primary);
  font-family: 'Orbitron', sans-serif;
}

.challenge-difficulty {
  padding: 5px 15px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.difficulty-easy {
  background: rgba(57, 255, 20, 0.2);
  color: var(--neon-green);
  border: 1px solid var(--neon-green);
}

.difficulty-medium {
  background: rgba(255, 255, 0, 0.2);
  color: var(--neon-yellow);
  border: 1px solid var(--neon-yellow);
}

.difficulty-hard {
  background: rgba(255, 0, 128, 0.2);
  color: var(--neon-pink);
  border: 1px solid var(--neon-pink);
}

.challenge-description {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

/* 数据探索 */
.upload-area {
  border: 3px dashed var(--neon-cyan);
  border-radius: 16px;
  padding: 60px;
  text-align: center;
  margin-bottom: 40px;
  transition: all 0.3s ease;
  background: var(--dark-secondary);
  position: relative;
  overflow: hidden;
}

.upload-area::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0, 255, 255, 0.05), transparent);
  transition: left 0.5s ease;
}

.upload-area:hover::before {
  left: 100%;
}

.upload-area:hover {
  border-color: var(--neon-pink);
  background: rgba(255, 0, 128, 0.05);
  transform: scale(1.02);
}

.upload-area.dragover {
  border-color: var(--neon-green);
  background: rgba(57, 255, 20, 0.1);
}

.upload-icon {
  font-size: 64px;
  margin-bottom: 20px;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.upload-text {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

/* 表格样式 */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(0, 255, 255, 0.3);
}

.data-table th, .data-table td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid rgba(0, 255, 255, 0.2);
}

.data-table th {
  background: var(--dark-tertiary);
  color: var(--neon-cyan);
  font-weight: 600;
  font-family: 'Orbitron', sans-serif;
}

.data-table tr:hover {
  background: rgba(0, 255, 255, 0.05);
}

/* 加载动画 */
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 60px;
}

.loading-panda {
  font-size: 80px;
  animation: pandaEat 1.5s ease-in-out infinite;
}

@keyframes pandaEat {
  0%, 100% { transform: rotate(0deg) scale(1); }
  25% { transform: rotate(-10deg) scale(1.1); }
  50% { transform: rotate(0deg) scale(1); }
  75% { transform: rotate(10deg) scale(1.1); }
}

.loading-text {
  color: var(--neon-cyan);
  font-size: 18px;
  margin-top: 20px;
  font-family: 'Orbitron', sans-serif;
  animation: blink 1s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* 庆祝特效 */
.confetti {
  position: fixed;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  animation: confettiFall 3s ease-in-out forwards;
  z-index: 10000;
}

@keyframes confettiFall {
  0% {
    transform: translateY(-100vh) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}

/* 熊猫动画元素 */
.panda-float {
  position: fixed;
  font-size: 40px;
  animation: float 3s ease-in-out infinite;
  z-index: 100;
  pointer-events: none;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(10deg); }
}

/* 霓虹发光效果 */
.neon-text {
  text-shadow: 
    0 0 5px currentColor,
    0 0 10px currentColor,
    0 0 20px currentColor,
    0 0 40px currentColor;
}

.neon-box {
  box-shadow: 
    0 0 5px currentColor,
    0 0 10px currentColor,
    0 0 20px currentColor;
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 48px;
  }
  
  .navbar-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--dark-secondary);
    flex-direction: column;
    align-items: center;
    padding: 30px;
    transform: translateY(-100%);
    transition: transform 0.3s ease;
    opacity: 0;
    visibility: hidden;
    border-bottom: 2px solid var(--neon-cyan);
  }
  
  .navbar-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .navbar-toggle {
    display: block;
  }
  
  .path-timeline::before {
    left: 20px;
  }
  
  .path-item {
    flex-direction: row !important;
    padding-left: 60px;
    text-align: left !important;
  }
  
  .path-dot {
    left: 20px;
  }
  
  .path-content {
    margin: 0 0 0 30px;
    max-width: 100%;
  }
  
  .progress-info {
    grid-template-columns: 1fr;
  }
  
  .datasets-grid,
  .examples-list,
  .challenges-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 36px;
  }
  
  .hero p {
    font-size: 16px;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: 15px;
  }
  
  .btn {
    width: 100%;
    max-width: 300px;
  }
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--dark-tertiary);
}

::-webkit-scrollbar-thumb {
  background: var(--neon-purple);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--neon-cyan);
}

/* 功能模块卡片 */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 25px;
  margin: 30px 0;
}

.module-card {
  background: var(--dark-secondary);
  border-radius: 16px;
  padding: 30px;
  border: 2px solid transparent;
  transition: all 0.3s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.module-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-1);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.module-card:hover::after {
  transform: scaleX(1);
}

.module-card:hover {
  transform: translateY(-5px);
  border-color: var(--neon-pink);
  box-shadow: 0 10px 30px rgba(255, 0, 128, 0.3);
}

.module-icon {
  font-size: 48px;
  margin-bottom: 15px;
}

.module-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--neon-cyan);
  margin-bottom: 10px;
  font-family: 'Orbitron', sans-serif;
}

.module-description {
  font-size: 14px;
  color: var(--text-secondary);
}

/* 测验组件 */
.quiz-container {
  background: var(--dark-secondary);
  border-radius: 16px;
  padding: 30px;
  border: 2px solid var(--neon-purple);
  margin: 20px 0;
}

.quiz-question {
  font-size: 18px;
  color: var(--text-primary);
  margin-bottom: 20px;
  font-weight: 600;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quiz-option {
  padding: 15px 20px;
  background: var(--dark-tertiary);
  border: 2px solid var(--neon-purple);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--text-primary);
}

.quiz-option:hover {
  background: rgba(191, 0, 255, 0.1);
  border-color: var(--neon-cyan);
}

.quiz-option.correct {
  background: rgba(57, 255, 20, 0.2);
  border-color: var(--neon-green);
  color: var(--neon-green);
}

.quiz-option.incorrect {
  background: rgba(255, 0, 128, 0.2);
  border-color: var(--neon-pink);
  color: var(--neon-pink);
}

/* 熊猫助手 */
.panda-assistant {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 70px;
  height: 70px;
  background: var(--gradient-1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  cursor: pointer;
  box-shadow: 0 0 30px rgba(255, 0, 128, 0.5);
  transition: all 0.3s ease;
  z-index: 1000;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.panda-assistant:hover {
  transform: scale(1.1);
  box-shadow: 0 0 50px rgba(255, 0, 128, 0.7);
}

/* 熊猫提示气泡 */
.panda-tip {
  position: absolute;
  bottom: 90px;
  right: 0;
  background: var(--dark-secondary);
  border: 2px solid var(--neon-pink);
  border-radius: 12px;
  padding: 20px;
  max-width: 300px;
  box-shadow: 0 0 20px rgba(255, 0, 128, 0.3);
  animation: fadeIn 0.3s ease;
}

.panda-tip::after {
  content: '';
  position: absolute;
  bottom: -10px;
  right: 25px;
  width: 0;
  height: 0;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;
  border-top: 10px solid var(--neon-pink);
}

/* 徽章系统 */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--gradient-2);
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--dark-bg);
}

.badge-icon {
  font-size: 18px;
}

/* 代码片段收藏 */
.favorite-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(255, 255, 0, 0.2);
  border: 1px solid var(--neon-yellow);
  border-radius: 12px;
  font-size: 12px;
  color: var(--neon-yellow);
  margin-right: 8px;
  margin-bottom: 8px;
}

/* 动画类 */
.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.slide-in-left {
  animation: slideInLeft 0.5s ease forwards;
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-30px); }
  to { opacity: 1; transform: translateX(0); }
}

.scale-in {
  animation: scaleIn 0.3s ease forwards;
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1); }
}

/* 工具提示 */
.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  padding: 8px 12px;
  background: var(--dark-tertiary);
  border: 1px solid var(--neon-cyan);
  border-radius: 6px;
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
  bottom: calc(100% + 10px);
}

/* 统计卡片 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  margin: 30px 0;
}

.stat-card {
  background: var(--dark-secondary);
  border-radius: 12px;
  padding: 25px;
  text-align: center;
  border: 1px solid rgba(0, 255, 255, 0.2);
  transition: all 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-3px);
  border-color: var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
}

.stat-icon {
  font-size: 32px;
  margin-bottom: 10px;
}

.stat-value {
  font-size: 36px;
  font-weight: 900;
  color: var(--neon-pink);
  font-family: 'Orbitron', sans-serif;
}

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 5px;
}

@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 快捷键提示 */
.shortcut-hint {
  display: inline-block;
  padding: 4px 8px;
  background: var(--dark-tertiary);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  font-size: 12px;
  font-family: 'Fira Code', monospace;
  color: var(--text-secondary);
}

/* 标签页 */
.tab-container {
  margin: 30px 0;
}

.tab-header {
  display: flex;
  gap: 5px;
  margin-bottom: 20px;
  border-bottom: 2px solid var(--dark-tertiary);
}

.tab-button {
  padding: 12px 24px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
}

.tab-button::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-1);
  transition: width 0.3s ease;
}

.tab-button:hover {
  color: var(--text-primary);
}

.tab-button.active {
  color: var(--neon-pink);
}

.tab-button.active::after {
  width: 100%;
}

.tab-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-content.active {
  display: block;
}

/* 课程区域样式 */
.course-section {
  padding: 25px;
  background: var(--dark-tertiary);
  border-radius: 12px;
  margin-bottom: 20px;
  border: 1px solid rgba(0, 255, 255, 0.1);
  transition: all 0.3s ease;
}

.course-section:hover {
  border-color: rgba(0, 255, 255, 0.3);
  box-shadow: 0 5px 20px rgba(0, 255, 255, 0.1);
}

.course-section.highlight {
  border-color: var(--neon-orange);
  background: linear-gradient(135deg, rgba(255, 102, 0, 0.1) 0%, var(--dark-tertiary) 100%);
}

.course-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
}

.course-header h3 {
  margin-bottom: 0 !important;
}

.course-outline {
  margin-top: 20px;
  padding: 20px;
  background: var(--dark-bg);
  border-radius: 8px;
  border-left: 3px solid var(--neon-cyan);
}

.outline-block {
  padding: 15px;
  background: var(--dark-bg);
  border-radius: 8px;
  border: 1px solid rgba(0, 255, 255, 0.1);
}

.outline-block:hover {
  border-color: rgba(0, 255, 255, 0.3);
}

.course-highlights {
  margin-top: 20px;
  padding: 20px;
  background: rgba(57, 255, 20, 0.05);
  border-radius: 8px;
  border: 1px solid rgba(57, 255, 20, 0.2);
}