/* ============================================
   Code Lab - 终末地风格代码练习区域
   深色主题 / 磨砂玻璃质感 / 发光边框
   ============================================ */

/* ---------- 整体容器 ---------- */
.code-lab {
  position: relative;
  width: 100%;
  border-radius: 12px;
  background: rgba(51, 51, 51, 0.5);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.code-lab:hover {
  border-color: rgba(0, 229, 255, 0.2);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.06), 0 0 60px rgba(0, 229, 255, 0.03);
}

/* ---------- 课程内容 / 知识点区域 ---------- */
.code-lab-content {
  padding: 20px 24px;
  color: #B0B0B0;
  font-size: 15px;
  line-height: 1.7;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.code-lab-content h3 {
  color: #FFFFFF;
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 12px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.code-lab-content h3::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 18px;
  border-radius: 2px;
  background: linear-gradient(180deg, #F9D342, #00E5FF);
}

.code-lab-content p {
  margin: 0 0 8px 0;
}

.code-lab-content code {
  background: rgba(0, 229, 255, 0.1);
  color: #00E5FF;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 13px;
}

.code-lab-content ul,
.code-lab-content ol {
  margin: 8px 0;
  padding-left: 20px;
}

.code-lab-content li {
  margin-bottom: 4px;
}

/* ---------- 发光圆点 ---------- */
.code-lab-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #F9D342;
    box-shadow: 0 0 6px rgba(249, 211, 66, 0.6);
    animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ---------- 空状态提示 ---------- */
.code-lab-empty-state {
    color: #555555;
    font-style: italic;
    font-size: 13px;
    padding: 20px;
    text-align: center;
}

/* ---------- 代码编辑区 ---------- */
.code-lab-editor {
  display: flex;
  flex-direction: column;
}

/* --- 工具栏 --- */
.code-lab-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: rgba(0, 0, 0, 0.25);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  gap: 12px;
  flex-wrap: wrap;
}

/* 文件标签 */
.code-lab-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #7A7A7A;
  font-size: 13px;
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  user-select: none;
}

.code-lab-tab::before {
  content: '';
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #F9D342;
  box-shadow: 0 0 6px rgba(249, 211, 66, 0.4);
}

/* 按钮组 */
.code-lab-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 通用按钮基础 */
.code-lab-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
  cursor: pointer;
  color: #FFFFFF;
  transition: all 0.2s ease;
  user-select: none;
  white-space: nowrap;
}

.code-lab-btn:active {
  transform: scale(0.96);
}

/* 运行代码 - 绿色 */
.code-lab-btn-run {
  background: #22c55e;
  box-shadow: 0 0 12px rgba(34, 197, 94, 0.3);
}

.code-lab-btn-run:hover {
  background: #16a34a;
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.5);
}

/* 清除内容 - 橙色 */
.code-lab-btn-clear {
  background: #f97316;
  box-shadow: 0 0 12px rgba(249, 115, 22, 0.3);
}

.code-lab-btn-clear:hover {
  background: #ea580c;
  box-shadow: 0 0 20px rgba(249, 115, 22, 0.5);
}

/* 参考答案 - 紫色 */
.code-lab-btn-ref {
  background: #a855f7;
  box-shadow: 0 0 12px rgba(168, 85, 247, 0.3);
}

.code-lab-btn-ref:hover {
  background: #9333ea;
  box-shadow: 0 0 20px rgba(168, 85, 247, 0.5);
}

.code-lab-btn-ref.is-active {
  background: #7e22ce;
  box-shadow: 0 0 20px rgba(168, 85, 247, 0.5);
}

/* --- 代码输入框（textarea + 行号） --- */
.code-lab-textarea-wrap {
  position: relative;
  display: flex;
  min-height: 200px;
  background: #0A0A0A;
}

/* 行号 */
.code-lab-line-numbers {
  flex-shrink: 0;
  width: 48px;
  padding: 14px 8px 14px 0;
  text-align: right;
  color: #555555;
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 13px;
  line-height: 20.8px;  /* 13px * 1.6 = 20.8px */
  user-select: none;
  overflow: hidden;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
  background: #0A0A0A;
  white-space: pre;
}

.code-lab-textarea {
  flex: 1;
  width: 100%;
  padding: 14px 16px;
  background: #111318;
  color: #e8e8e8;
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 13px;
  line-height: 20.8px;  /* 固定值，与行号一致 */
  border: 1px solid rgba(255,255,255,0.06);
  outline: none;
  resize: vertical;
  min-height: 200px;
  tab-size: 4;
  -moz-tab-size: 4;
  white-space: pre;
  overflow-x: auto;
}

.code-lab-textarea::placeholder {
  color: #7A7A7A;
}

.code-lab-textarea::selection {
  background: rgba(0, 229, 255, 0.2);
}

/* ---------- 运行结果区 ---------- */
.code-lab-output {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.code-lab-output-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 500;
  color: #B0B0B0;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  user-select: none;
}

.code-lab-output-header::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 6px rgba(34, 197, 94, 0.5);
}

.code-lab-output-body {
  padding: 14px 16px;
  min-height: 60px;
  max-height: 400px;
  overflow-y: auto;
  background: #0D0D0D;
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 13px;
  line-height: 1.6;
  color: #B0B0B0;
  white-space: pre-wrap;
  word-break: break-all;
}

/* 空状态提示 */
.code-lab-output-body.is-empty::before {
  content: '点击 "运行代码" 查看输出结果...';
  color: #7A7A7A;
  font-style: italic;
}

/* 运行成功状态 */
.code-lab-output-body.is-success {
  color: #22c55e;
}

/* 运行动画 - 逐行显示 */
.code-lab-output-line {
  display: block;
  opacity: 0;
  transform: translateY(4px);
  animation: codeLabFadeIn 0.15s ease forwards;
}

@keyframes codeLabFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 参考答案区 ---------- */
.code-lab-reference {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.code-lab-reference.is-visible {
  max-height: 600px;
}

.code-lab-reference-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 500;
  color: #B0B0B0;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  user-select: none;
}

.code-lab-reference-header::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #a855f7;
  box-shadow: 0 0 6px rgba(168, 85, 247, 0.5);
}

.code-lab-reference-body {
  padding: 14px 16px;
  background: #111318;
  border-left: 3px solid #a855f7;
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 13px;
  line-height: 1.6;
  color: #d4d4d4;
  white-space: pre-wrap;
  word-break: break-all;
  overflow-x: auto;
}

/* ---------- 滚动条美化 ---------- */
.code-lab-textarea-wrap::-webkit-scrollbar,
.code-lab-output-body::-webkit-scrollbar,
.code-lab-reference-body::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.code-lab-textarea-wrap::-webkit-scrollbar-track,
.code-lab-output-body::-webkit-scrollbar-track,
.code-lab-reference-body::-webkit-scrollbar-track {
  background: transparent;
}

.code-lab-textarea-wrap::-webkit-scrollbar-thumb,
.code-lab-output-body::-webkit-scrollbar-thumb,
.code-lab-reference-body::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 3px;
}

.code-lab-textarea-wrap::-webkit-scrollbar-thumb:hover,
.code-lab-output-body::-webkit-scrollbar-thumb:hover,
.code-lab-reference-body::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ---------- 响应式适配 ---------- */
@media (max-width: 640px) {
  .code-lab-content {
    padding: 16px;
    font-size: 14px;
  }

  .code-lab-toolbar {
    padding: 8px 12px;
    gap: 8px;
  }

  .code-lab-actions {
    gap: 6px;
  }

  .code-lab-btn {
    padding: 5px 10px;
    font-size: 12px;
  }

  .code-lab-line-numbers {
    width: 36px;
    font-size: 12px;
  }

  .code-lab-textarea {
    font-size: 12px;
    padding: 12px;
  }

  .code-lab-output-body,
  .code-lab-reference-body {
    font-size: 12px;
    padding: 12px;
  }
}