.yz-converter-container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0; box-sizing: border-box; }
.yz-control-row { margin-bottom: 20px; text-align: center; }
.yz-mode-selector { display: inline-flex; align-items: center; justify-content: center; gap: 10px; }
.yz-text-label { padding: 10px 24px; font-size: 15px; font-weight: 500; color: #333; min-width: 100px; text-align: center; border-radius: 6px; background: #f5f5f5; height: 44px; display: flex; align-items: center; justify-content: center; }
.yz-switch-btn { padding: 8px; border: 1px solid #e0e0e0; border-radius: 6px; background: transparent; cursor: pointer; transition: all 0.3s ease; display: flex; align-items: center; justify-content: center; width: 44px; height: 44px; box-sizing: border-box; }
.yz-switch-btn:hover { border-color: #4a6cf7; background-color: rgba(74, 108, 247, 0.1); }
.yz-switch-btn:active { transform: scale(0.95); }
.yz-switch-btn svg { color: #666; }
.yz-switch-btn:hover svg { color: #4a6cf7; }
.yz-row { display: flex; flex-wrap: wrap; gap: 20px; margin-bottom: 20px; }
.yz-col { flex: 1; min-width: 300px; }
.yz-textarea-wrapper { position: relative; border: 1px solid #e8e8e8; border-radius: 6px; background: #fff; transition: border-color 0.3s; }
.yz-textarea-wrapper:focus-within { border-color: #4a6cf7; }
.yz-textarea { width: 100%; padding: 16px; border: none; resize: vertical; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif; font-size: 15px; line-height: 1.6; color: #333; background: transparent; box-sizing: border-box; }
.yz-textarea:focus { outline: none; }
.yz-textarea::placeholder { color: #bfbfbf; }
.yz-char-count { position: absolute; bottom: 10px; right: 12px; font-size: 12px; color: #8c8c8c; background: rgba(255, 255, 255, 0.9); padding: 2px 8px; border-radius: 10px; pointer-events: none; }
/* 复制按钮已调整到左下角 */
.yz-copy-btn { position: absolute; bottom: 8px; left: 12px; width: 28px; height: 28px; border: 1px solid #d9d9d9; border-radius: 4px; background: #fff; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.2s ease; }
.yz-copy-btn:hover { background: #f5f5f5; border-color: #bfbfbf; }
.yz-copy-btn:hover svg { color: #4a6cf7; }
.yz-copy-btn:active { transform: scale(0.95); }
.yz-copy-btn svg { color: #666; }
.yz-copy-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.yz-copy-btn:disabled:hover { background: #fff; border-color: #d9d9d9; }
.yz-loading-overlay { position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: rgba(255, 255, 255, 0.9); display: flex; flex-direction: column; align-items: center; justify-content: center; z-index: 10; border-radius: 6px; }
.yz-loading-spinner { width: 40px; height: 40px; border: 3px solid #f3f3f3; border-top: 3px solid #4a6cf7; border-radius: 50%; animation: yz-spin 1s linear infinite; margin-bottom: 12px; }
.yz-loading-text { font-size: 14px; color: #666; }
@keyframes yz-spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
#seo-intro {
  width: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: #333;
  box-sizing: border-box;
  background: #f9f9f9;
  border-radius: 6px;
  padding: 20px;
  margin: 20px 0 0 0;
}
#seo-intro h2 {
  margin: 0 0 12px 0;
  font-size: 18px;
  font-weight: 600;
  color: #333;
  padding-bottom: 12px;
  border-bottom: 2px solid #4a6cf7;
}
#seo-intro h3 {
  margin: 20px 0 10px 0;
  font-size: 16px;
  font-weight: 500;
  color: #333;
  position: relative;
  padding-left: 10px;
}
#seo-intro h3:before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  width: 4px;
  height: 16px;
  background: #4a6cf7;
  border-radius: 2px;
}
#seo-intro p {
  margin: 0 0 15px 0;
  font-size: 14px;
  color: #666;
  line-height: 1.6;
}
#seo-intro ul, #seo-intro ol {
  margin: 10px 0;
  padding-left: 24px;
}
#seo-intro li {
  margin: 8px 0;
  font-size: 14px;
  line-height: 1.6;
  color: #555;
  padding-left: 4px;
}
#seo-intro ul li:before {
  content: '•';
  color: #4a6cf7;
  font-weight: bold;
  display: inline-block;
  width: 1em;
  margin-left: -1em;
}
#seo-intro ol li {
  counter-increment: list-counter;
  padding-left: 8px;
}
#seo-intro ol {
  counter-reset: list-counter;
}
#seo-intro ol li:before {
  content: counter(list-counter) '.';
  color: #4a6cf7;
  font-weight: 500;
  margin-right: 6px;
}
#seo-intro strong {
  font-weight: 500;
  color: #333;
}
#seo-intro h3:first-of-type {
  margin-top: 0;
}
#seo-intro p:last-child {
  margin-top: 20px;
  padding-top: 15px;
  border-top: 1px solid #e8e8e8;
  color: #888;
  font-size: 13px;
  font-style: italic;
}