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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f8f9fa;
  color: #222;
  min-height: 100vh;
}

/* 视图切换 */
.view { width: 100%; }
.hidden { display: none !important; }

/* 容器 */
.container {
  margin: 0 auto;
  padding: 40px 20px;
}
.container--labels { max-width: 600px; }
.container--quiz   { max-width: 700px; }

/* 标题 */
.page-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
}

/* 标签网格 */
.label-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
@media (max-width: 480px) {
  .label-grid { grid-template-columns: repeat(2, 1fr); }
}

.label-card {
  background: #fff;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  padding: 16px 12px;
  text-align: center;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
  overflow-wrap: break-word;
}
.label-card:hover { border-color: #aaa; }
.label-card:focus-visible { outline: 2px solid #222; outline-offset: 2px; }
.label-card.selected {
  background: linear-gradient(135deg, rgba(255,122,0,0.88), rgba(255,80,0,0.78));
  border-color: rgba(255,106,0,0.55);
  color: #fff;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 4px 14px rgba(255,106,0,0.28), inset 0 1px 0 rgba(255,255,255,0.28);
}

/* 错误提示 */
.error-msg {
  color: #e53e3e;
  font-size: 14px;
  margin-bottom: 12px;
}

/* 开始按钮区 */
.start-bar {
  display: flex;
  justify-content: flex-end;
  margin-top: 24px;
}

/* 按钮 */
.btn {
  padding: 8px 20px;
  border: none;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.15s;
}
.btn:focus-visible { outline: 2px solid rgba(255,106,0,0.7); outline-offset: 2px; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn--primary {
  background: linear-gradient(135deg, rgba(255,122,0,0.92), rgba(255,80,0,0.82));
  color: #fff;
  border: 1px solid rgba(255,106,0,0.45);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(255,106,0,0.22), inset 0 1px 0 rgba(255,255,255,0.28);
}
.btn--primary:hover:not(:disabled) {
  background: linear-gradient(135deg, rgba(255,138,20,0.96), rgba(255,96,0,0.88));
  box-shadow: 0 4px 16px rgba(255,106,0,0.36), inset 0 1px 0 rgba(255,255,255,0.32);
}
.btn--secondary {
  background: #f0f0f0;
  color: #555;
  border: 1px solid #e0e0e0;
}
.btn--secondary:hover:not(:disabled) {
  background: linear-gradient(135deg, rgba(255,122,0,0.92), rgba(255,80,0,0.82));
  color: #fff;
  border-color: rgba(255,106,0,0.45);
  box-shadow: 0 2px 10px rgba(255,106,0,0.22), inset 0 1px 0 rgba(255,255,255,0.28);
}
.btn-link {
  background: none;
  border: none;
  color: #555;
  font-size: 14px;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
}
.btn-link:hover { color: #222; }
.btn-link:focus-visible { outline: 2px solid #222; outline-offset: 2px; }

/* 问答顶部栏 */
.quiz-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.topbar-label {
  font-size: 13px;
  color: #888;
  font-weight: 500;
}

/* 卡片 */
.card {
  background: #fff;
  border-radius: 8px;
  padding: 20px 24px;
  border: 1px solid #e8e8e8;
  margin-bottom: 12px;
  min-height: 80px;
}

/* Chip */
.chip {
  display: inline-block;
  background: #f0f0f0;
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 12px;
  color: #555;
  margin-bottom: 16px;
}

/* 输入区 */
.answer-input {
  width: 100%;
  min-height: 100px;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 12px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
  transition: border-color 0.15s;
}
.answer-input:focus {
  border-color: #aaa;
  box-shadow: 0 0 0 2px rgba(34,34,34,0.2);
}

/* 按钮行 */
.btn-row {
  display: flex;
  justify-content: space-between;
  margin-top: 12px;
  margin-bottom: 20px;
}

/* 答案区 */
.answer-area {
  background: #fff;
  border-radius: 8px;
  padding: 20px 24px;
  border: 1px solid #e8e8e8;
  margin-top: 4px;
  overflow: hidden;
}
.thinking {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #888;
  font-size: 13px;
  padding: 4px 0 8px;
}
.thinking-dots {
  display: flex;
  gap: 4px;
}
.thinking-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #bbb;
  animation: thinking-bounce 1.2s infinite ease-in-out;
}
.thinking-dots span:nth-child(2) { animation-delay: 0.2s; }
.thinking-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes thinking-bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.4; }
  40%            { transform: translateY(-5px); opacity: 1; }
}

.typewriter {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
  line-height: 1.6;
  color: #555;
  white-space: pre-wrap;
  word-break: break-all;
  background: none;
  border: none;
  padding: 0;
  margin: 0;
}

.answer-section { margin-bottom: 20px; }
.answer-section:last-child { margin-bottom: 0; }

.answer-section-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 700;
  color: #222;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid #eee;
}
.answer-icon { font-size: 16px; line-height: 1; }

.answer-section-body { color: #333; }

/* Markdown 样式（通用） */
.markdown-body { line-height: 1.7; font-size: 15px; }
.markdown-body h1, .markdown-body h2, .markdown-body h3 {
  margin: 16px 0 8px;
  font-weight: 600;
}
.markdown-body p { margin-bottom: 10px; }
.markdown-body ul, .markdown-body ol {
  padding-left: 20px;
  margin-bottom: 10px;
}
.markdown-body li { margin-bottom: 4px; }
.markdown-body code {
  background: #f5f5f5;
  border-radius: 3px;
  padding: 2px 5px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
}
.markdown-body pre {
  background: #f5f5f5;
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  margin-bottom: 12px;
}
.markdown-body pre code {
  background: none;
  padding: 0;
  font-size: 13px;
}
.markdown-body blockquote {
  border-left: 3px solid #e0e0e0;
  padding-left: 12px;
  color: #666;
  margin-bottom: 10px;
}
.markdown-body table {
  border-collapse: collapse;
  width: 100%;
  margin-bottom: 12px;
}
.markdown-body th, .markdown-body td {
  border: 1px solid #e0e0e0;
  padding: 6px 12px;
  text-align: left;
}
.markdown-body th { background: #f5f5f5; font-weight: 600; }

/* 答案区 Markdown 增强样式 */
.answer-area .markdown-body {
  font-size: 15px;
  line-height: 1.8;
  color: #1a1a1a;
  word-break: break-word;
  overflow-wrap: break-word;
}

.answer-area .markdown-body h1 { font-size: 19px; margin: 20px 0 8px; padding-bottom: 6px; border-bottom: 1px solid #eee; }
.answer-area .markdown-body h2 { font-size: 17px; margin: 16px 0 6px; padding-bottom: 4px; border-bottom: 1px solid #eee; }
.answer-area .markdown-body h3 { font-size: 15px; margin: 14px 0 6px; color: #333; }

.answer-area .markdown-body p { margin-bottom: 12px; }

.answer-area .markdown-body ul { list-style: disc; padding-left: 20px; margin-bottom: 12px; }
.answer-area .markdown-body ul li { margin-bottom: 6px; }
.answer-area .markdown-body ol { padding-left: 20px; margin-bottom: 12px; }
.answer-area .markdown-body ol li { margin-bottom: 6px; }

.answer-area .markdown-body code {
  background: #f3f4f6;
  color: #374151;
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 13px;
  font-family: "SFMono-Regular", Consolas, monospace;
  word-break: break-all;
}

.answer-area .markdown-body pre {
  background: #f6f8fa;
  border: 1px solid #e8e8e8;
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  margin: 10px 0 14px;
  max-width: 100%;
}
.answer-area .markdown-body pre code {
  background: none;
  color: #24292e;
  font-size: 13px;
  line-height: 1.6;
  padding: 0;
  word-break: normal;
}

.answer-area .markdown-body blockquote {
  border-left: 3px solid #d0d0d0;
  padding: 8px 14px;
  color: #666;
  margin: 10px 0;
  background: #fafafa;
}
.answer-area .markdown-body blockquote p { margin-bottom: 0; }

.answer-area .markdown-body table {
  border-collapse: collapse;
  width: 100%;
  margin-bottom: 14px;
  display: block;
  overflow-x: auto;
}
.answer-area .markdown-body th {
  background: #f3f4f6;
  color: #222;
  font-weight: 600;
  padding: 8px 12px;
  border: 1px solid #e0e0e0;
  text-align: left;
}
.answer-area .markdown-body td {
  padding: 7px 12px;
  border: 1px solid #e0e0e0;
}
.answer-area .markdown-body tr:nth-child(even) td { background: #fafafa; }

.answer-area .markdown-body strong { font-weight: 600; color: #111; }
.answer-area .markdown-body em { font-style: italic; }