/* --- 基础变量定义 (浅色模式默认) --- */
:root {
  /* 浅色模式颜色 */
  --bg-color: #e5eeff;
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-shadow: rgba(100, 100, 200, 0.15);
  --primary-color: #4a90e2;
  --primary-hover: #3a7bc8;
  --text: #2c3e50;
  --text-dark: #2c3e50;
  --text-light: #ffffff;
  --text-muted: #7f8c8d;
  --white-high: rgba(255, 255, 255, 0.9);
  --white-medium: rgba(255, 255, 255, 0.6);
  --white-low: rgba(255, 255, 255, 0.35);
  --modal-bg: rgba(255, 255, 255, 0.85);
  --modal-close-btn-bg: rgba(255, 255, 255, 0.95);
  --success-color: #4caf50;
  --success-hover: #45a049;
  --error-color: #d32f2f;
  --error-hover: #c62828;
  --toast-bg: rgba(50, 50, 50, 0.85);
  --toast-text: white;
  /* Loader 颜色 */
  --loader-border: rgba(74, 144, 226, 0.2);
  --loader-top: #4a90e2;
  /* 模型标签颜色 */
  --tag-strong-bg: #4a90e2;
  --tag-strong-text: #ffffff;
  --tag-free-bg: #4caf50;
  --tag-free-text: #ffffff;
}

* {
  -webkit-tap-highlight-color: transparent;
  user-select: none !important;
}

/* --- 深色模式变量覆盖 --- */
@media (prefers-color-scheme: dark) {
  :root {
    /* 深色模式颜色 */
    --bg-color: #1a1a2e; /* 深蓝/黑色背景 */
    --glass-bg: rgba(30, 30, 46, 0.8); /* 更深的半透明背景 */
    --glass-border: rgba(255, 255, 255, 0.1); /* 更淡的边框 */
    --glass-shadow: rgba(0, 0, 0, 0.3); /* 更深的阴影 */
    --primary-color: #5b9bd5; /* 调亮一点的主色 */
    --primary-hover: #4a8ac4;
    --text: #ffffff;
    --text-dark: #e0e0e0; /* 浅灰色文字 */
    --text-light: #ffffff;
    --text-muted: #a0a0a0; /* 更淡的提示文字 */
    --white-high: rgba(255, 255, 255, 0.15); /* 深色下的浅色高亮 */
    --white-medium: rgba(255, 255, 255, 0.1); /* 深色下的中等浅色 */
    --white-low: rgba(255, 255, 255, 0.05); /* 深色下的低浅色 */
    --modal-bg: rgba(40, 40, 60, 0.85); /* 深色弹窗背景 */
    --modal-close-btn-bg: rgba(50, 50, 70, 0.95); /* 深色关闭按钮背景 */
    --success-color: #66bb6a; /* 深色下更亮的成功色 */
    --success-hover: #55aa55;
    --error-color: #ef5350; /* 深色下更亮的错误色 */
    --error-hover: #e53935;
    --toast-bg: rgba(200, 200, 200, 0.85); /* 深色下 Toast 背景 (浅灰) */
    --toast-text: #1a1a2e; /* 深色下 Toast 文字 (深色) */
    /* 深色模式 Loader 颜色 */
    --loader-border: rgba(91, 155, 213, 0.2);
    --loader-top: #5b9bd5;
    /* 深色模式模型标签颜色 */
    --tag-strong-bg: #5b9bd5;
    --tag-strong-text: #ffffff;
    --tag-free-bg: #66bb6a;
    --tag-free-text: #ffffff;
  }
}

/* --- 其余样式保持不变，使用变量 --- */
* {
  box-sizing: border-box;
}

/* --- 模型标签样式 --- */
.model-tag {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  margin-left: 8px;
  vertical-align: middle;
  transition: all 0.3s ease;
}

.model-tag.strong {
  background-color: var(--tag-strong-bg);
  color: var(--tag-strong-text);
  border: 2px solid white;
}

.model-tag.free {
  background-color: var(--tag-free-bg);
  border: 2px solid white;
  color: var(--tag-free-text);
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background-color: var(--bg-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text-dark); /* 设置默认文字颜色 */
  transition: background-color 0.3s ease, color 0.3s ease; /* 平滑过渡 */
  user-select: none !important;
}

.glass-container {
  width: 90%;
  max-width: 550px;
  margin-top: 40px;
  padding: 30px;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 20px;
  box-shadow: 0 8px 32px 0 var(--glass-shadow);
  border: 1px solid var(--glass-border);
  box-sizing: border-box;
  transition: background 0.3s ease, border 0.3s ease, box-shadow 0.3s ease; /* 平滑过渡 */
}

h1 {
  font-size: 28px;
  color: var(--text-dark);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  text-align: center;
  margin-top: 0 !important;
  margin-bottom: 20px !important;
}

/* --- 选项卡样式 --- */
.tabs {
  display: flex;
  margin-bottom: 20px;
  border-radius: 12px;
  overflow: hidden;
  background: var(--white-low);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.03);
}

.tab-button {
  flex: 1;
  padding: 12px 0;
  border: none;
  background: none;
  color: var(--text-muted);
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  outline: none;
  position: relative;
  z-index: 1;
}

.tab-button.active {
  color: var(--text-dark);
  font-weight: 600;
}

.tab-button::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--primary-color);
  transform: scaleX(0);
  transition: transform 0.3s ease;
  z-index: -1;
}

.tab-button.active::after {
  transform: scaleX(1);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- 单词查询样式 --- */
.input-section {
  display: flex;
  flex-direction: column;
  margin-bottom: 25px;
  flex-grow: 1;
  width: 100%;
  padding: 15px 10px 10px 15px;
  border: none;
  border-radius: 12px;
  background: var(--white-medium);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  font-size: 16px;
  color: var(--text-dark);
  outline: none;
  box-sizing: border-box;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.input-wrapper {
  display: flex;
  gap: 12px;
}

.main-input {
  border: none;
  outline: none;
  background: transparent;
  width: 100%;
  font-family: sans-serif;
  color: var(--text);
}

.main-input::placeholder {
  color: var(--text-muted);
}

.button-container {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 10px;
}

.main-button {
  height: 40px;
  width: 40px;
  border: none;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--primary-color);
  color: white;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease,
    background-color 0.3s ease;
  outline: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-appearance: none;
  appearance: none;
  touch-action: manipulation;
}

.main-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
  background-color: var(--primary-hover);
}

.main-button:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.ai-translate-button {
  height: 40px;
  width: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  border: none;
  border-radius: 50%;
  color: var(--text-dark);
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  outline: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-appearance: none;
  appearance: none;
  touch-action: manipulation;
  background: none;
}

.ai-translate-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
}

.ai-translate-button:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#resultSection {
  min-height: 60px;
  padding: 15px;
  border-radius: 12px;
  background: var(--white-low);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.03);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: flex-start;
  margin-bottom: 15px;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.result-item {
  display: inline-block;
  padding: 6px 12px;
  background-color: var(--white-high);
  color: var(--text-dark);
  border-radius: 20px;
  font-size: 14px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  transition: transform 0.2s ease, box-shadow 0.2s ease,
    background-color 0.3s ease, color 0.3s ease;
  cursor: pointer;
  user-select: none !important;
  opacity: 0;
  transform: translateY(10px);
  animation: fadeInUp 0.3s forwards;
}

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

.result-item.exiting {
  animation: fadeOutDown 0.3s forwards;
}

@keyframes fadeOutDown {
  to {
    opacity: 0;
    transform: translateY(10px);
  }
}

.result-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.placeholder-text {
  color: var(--text-muted);
  font-style: italic;
  font-size: 15px;
}

.ai-text {
  color: var(--text-muted);
  font-size: 15px;
  display: flex;
  align-items: center;
}

.add-button-container {
  display: flex;
  justify-content: center;
}

#addButton {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: none;
  background-color: var(--primary-color);
  color: white;
  font-size: 24px;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease,
    background-color 0.3s ease, opacity 0.3s ease;
  flex-shrink: 0;
  opacity: 0;
  transform: scale(0.8);
  outline: none;
  -webkit-tap-highlight-color: transparent;
  /* 移动端优化 */
  -webkit-appearance: none;
  appearance: none;
  touch-action: manipulation; /* 禁用双击缩放 */
}

#addButton.show {
  opacity: 1;
  transform: scale(1);
}

#addButton:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
  background-color: var(--primary-hover);
}

#addButton:active {
  transform: scale(1);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* --- 整句查询样式 --- */
#sentenceInput {
  border: none;
  outline: none;
  background-color: transparent;
  resize: none;
  overflow: hidden; /* 不显示滚动条 */
  line-height: 1.5;
  min-height: 80px; /* 设置最小高度 */
}

#sentenceInput::placeholder {
  color: var(--text-muted);
}

#sentenceResultSection {
  min-height: 60px;
  padding: 15px;
  border-radius: 12px;
  background: var(--white-low);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.03);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.word-result-group {
  margin-bottom: 20px;
}

.word-result-group:last-child {
  margin-bottom: 0;
}

.word-label {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-dark);
  margin-bottom: 10px;
  display: block;
}

.word-results {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: flex-start;
}

/* --- 公共加载器样式 --- */
.loader-container {
  display: none;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 60px;
}

.loader-container.show {
  display: flex;
}

.loader {
  width: 40px;
  height: 40px;
  border: 5px solid var(--loader-border); /* 使用变量 */
  border-top: 5px solid var(--loader-top); /* 使用变量 */
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* --- 模态框样式 --- */
#addModal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.2); /* 浅色模式 */
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  justify-content: center;
  align-items: center;
  opacity: 0;
  animation: modalFadeIn 0.25s cubic-bezier(0.33, 1, 0.68, 1) forwards;
}

/* 深色模式下 modal 背景调整 */
@media (prefers-color-scheme: dark) {
  #addModal {
    background-color: rgba(0, 0, 0, 0.4); /* 深色模式下背景 */
  }
}

#addModal.show {
  display: flex !important;
}

#addModal.closing {
  animation: modalFadeOut 0.2s cubic-bezier(0.55, 0.085, 0.68, 0.53) forwards;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes modalFadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

.modal-content {
  background: var(--modal-bg);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border-radius: 20px;
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.25); /* 浅色模式 */
  border: 1px solid var(--glass-border);
  padding: 30px;
  width: 90%;
  max-width: 450px;
  box-sizing: border-box;
  transform: scale(0.8);
  animation: modalSlideIn 0.2s linear forwards;
  font-family: Arial, Helvetica, sans-serif;
  transition: background 0.3s ease, border 0.3s ease, box-shadow 0.3s ease;
}

/* 深色模式下 modal-content 阴影调整 */
@media (prefers-color-scheme: dark) {
  .modal-content {
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3); /* 深色模式 */
  }
}

#addModal.closing .modal-content {
  animation: modalSlideOut 0.2s linear forwards;
}

@keyframes modalSlideIn {
  from {
    transform: scale(0.8);
  }
  to {
    transform: scale(1);
  }
}

@keyframes modalSlideOut {
  from {
    transform: scale(1);
  }
  to {
    transform: scale(0.8);
  }
}

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

.modal-title {
  font-size: 22px;
  color: var(--text-dark);
  margin: 0;
}

.close {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background-color: var(--modal-close-btn-bg);
  color: var(--text-muted);
  font-size: 20px;
  font-weight: bold;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s ease, color 0.2s ease;
  border: none;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  outline: none;
  -webkit-tap-highlight-color: transparent;
  /* 移动端优化 */
  -webkit-appearance: none;
  appearance: none;
  touch-action: manipulation; /* 禁用双击缩放 */
}

.close:hover,
.close:focus {
  background-color: var(--white-high);
  color: var(--text-dark);
}

.modal-description {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.5;
}

#newDefinitionInput {
  flex-grow: 1;
  width: 100%;
  height: 80px;
  padding: 10px 15px;
  border: none;
  border-radius: 12px;
  background: var(--white-medium);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  font-size: 16px;
  font-family: inherit;
  color: var(--text-dark);
  outline: none;
  box-sizing: border-box;
  transition: background 0.3s ease, box-shadow 0.3s ease;
  resize: none;
  overflow-y: auto;
}

#newDefinitionInput::placeholder {
  color: var(--text-muted);
}

#newDefinitionInput:focus {
  background: var(--white-high);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.modal-button-container {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

#submitDefinitionButton {
  flex: 1;
  height: 42px;
  padding: 0 15px;
  border: none;
  border-radius: 12px;
  background-color: var(--primary-color);
  color: white;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease,
    background-color 0.3s ease;
  outline: none;
  -webkit-tap-highlight-color: transparent;
  /* 移动端优化 */
  -webkit-appearance: none;
  appearance: none;
  touch-action: manipulation; /* 禁用双击缩放 */
}

#submitDefinitionButton:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
  background-color: var(--primary-hover);
}

#submitDefinitionButton:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#submitDefinitionButton.success {
  background-color: var(--success-color);
}
#submitDefinitionButton.success:hover {
  background-color: var(--success-hover);
}

#submitDefinitionButton.error {
  background-color: var(--error-color);
}
#submitDefinitionButton.error:hover {
  background-color: var(--error-hover);
}

/* --- Toast 样式 --- */
#toast {
  position: fixed;
  top: 45%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  background: var(--toast-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--toast-text);
  padding: 12px 20px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  gap: 10px;
  opacity: 0;
  z-index: 1001;
  transition: opacity 0.3s ease, transform 0.3s ease;
  font-size: 14px;
  pointer-events: none;
}

#toast.show {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  fill: var(--success-color);
}

/* --- Footer 样式 --- */
footer {
  margin-top: auto;
  padding: 20px;
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
  width: 100%;
  box-sizing: border-box;
  transition: color 0.3s ease;
}

footer a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

footer a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

footer p {
  margin: 5px 0;
}

/* --- 新增样式 --- */
.no-result-link {
  color: var(--primary-color);
  text-decoration: none;
  cursor: pointer;
}

.no-result-link:hover {
  text-decoration: underline;
}

/* 补充图标按钮样式 */
.add-icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--white-high);
  color: var(--text-dark);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  cursor: pointer;
  margin-left: 10px;
  vertical-align: middle;
}

.add-icon-button svg {
  width: 16px;
  height: 16px;
}
.model-selector-container {
  position: relative;
  margin-right: 10px;
}

.model-selector-button {
  background: var(--white-medium);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 8px 15px;
  color: var(--text-dark);
  font-size: 14px;
  outline: none;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s ease;
}

.model-selector-button:hover {
  background: var(--white-high);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.model-selector-button:focus {
  box-shadow: 0 0 0 2px var(--primary-color);
}

/* 自定义弹窗 */
.model-selector-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  animation: modalFadeIn 0.25s cubic-bezier(0.33, 1, 0.68, 1) forwards;
}

.model-selector-modal.show {
  display: flex !important;
  opacity: 1;
}

.model-selector-modal.closing {
  animation: modalFadeOut 0.2s cubic-bezier(0.55, 0.085, 0.68, 0.53) forwards;
}

.model-selector-content {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 20px;
  box-shadow: 0 8px 32px 0 var(--glass-shadow);
  border: 1px solid var(--glass-border);
  padding: 20px;
  width: 90%;
  max-width: 320px;
  transform: scale(0.8);
  animation: modalSlideIn 0.2s linear forwards;
  transition: background 0.3s ease, border 0.3s ease, box-shadow 0.3s ease;
}

.model-selector-modal.closing .model-selector-content {
  animation: modalSlideOut 0.2s linear forwards;
}

.model-selector-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 15px;
  text-align: center;
}

.model-selector-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.model-option {
  background: var(--white-medium);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 12px 15px;
  color: var(--text-dark);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none !important;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
}

.model-option:hover {
  background: var(--white-high);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.model-option.selected {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* 焦点提示样式 */
.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  z-index: 1001;
  margin-bottom: 5px;
  pointer-events: none;
}

/* 只在hover时显示tooltip，移除focus状态显示 */
.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
}

/* 移除按钮焦点轮廓 */
.main-button:focus,
.ai-translate-button:focus,
.model-selector-button:focus {
  outline: none;
  box-shadow: none;
}

.model-selector-button:focus {
  box-shadow: 0 0 0 2px var(--primary-color);
}

/* 自定义弹窗 - 添加打开关闭动画 */
.model-selector-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  animation: modalFadeIn 0.25s cubic-bezier(0.33, 1, 0.68, 1) forwards;
}

.model-selector-modal.show {
  display: flex !important;
  opacity: 1;
}

.model-selector-modal.closing {
  animation: modalFadeOut 0.2s cubic-bezier(0.55, 0.085, 0.68, 0.53) forwards;
}

.model-selector-content {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 20px;
  box-shadow: 0 8px 32px 0 var(--glass-shadow);
  border: 1px solid var(--glass-border);
  padding: 20px;
  width: 90%;
  max-width: 320px;
  transform: scale(0.8);
  animation: modalSlideIn 0.2s linear forwards;
  transition: background 0.3s ease, border 0.3s ease, box-shadow 0.3s ease;
}

.model-selector-modal.closing .model-selector-content {
  animation: modalSlideOut 0.2s linear forwards;
}

.model-selector-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 15px;
  text-align: center;
}

.model-selector-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.model-option {
  background: var(--white-medium);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 12px 15px;
  color: var(--text-dark);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.model-option:hover {
  background: var(--white-high);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.model-option.selected {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* 焦点提示样式 */
.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  z-index: 1001;
  margin-bottom: 5px;
  pointer-events: none;
}

/* 只在hover时显示tooltip，移除focus状态显示 */
.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
}

/* 移除按钮焦点轮廓 */
.main-button:focus,
.ai-translate-button:focus,
.model-selector-button:focus {
  outline: none;
  box-shadow: none;
}

.model-selector-button:focus {
  box-shadow: 0 0 0 2px var(--primary-color);
}

/* 自定义弹窗 - 添加打开关闭动画 */
.model-selector-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  animation: modalFadeIn 0.25s cubic-bezier(0.33, 1, 0.68, 1) forwards;
}

.model-selector-modal.show {
  display: flex !important;
  opacity: 1;
}

.model-selector-content {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 20px;
  box-shadow: 0 8px 32px 0 var(--glass-shadow);
  border: 1px solid var(--glass-border);
  padding: 20px;
  width: 90%;
  max-width: 320px;
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

.model-selector-modal.show .model-selector-content {
  transform: scale(1);
}

.model-selector-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 15px;
  text-align: center;
}

.model-selector-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.model-option {
  background: var(--white-medium);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 12px 15px;
  color: var(--text-dark);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.model-option:hover {
  background: var(--white-high);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.model-option.selected {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* 焦点提示样式 */
.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  z-index: 1001;
  margin-bottom: 5px;
  pointer-events: none;
}

/* 只在hover时显示tooltip，移除focus状态显示 */
.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
}

/* 移除按钮焦点轮廓 */
.main-button:focus,
.ai-translate-button:focus,
.model-selector-button:focus {
  outline: none;
  box-shadow: none;
}

.model-selector-button:focus {
  box-shadow: 0 0 0 2px var(--primary-color);
}

/* 自定义弹窗 - 添加打开关闭动画 */
.model-selector-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  animation: modalFadeIn 0.25s cubic-bezier(0.33, 1, 0.68, 1) forwards;
}

.model-selector-modal.show {
  display: flex !important;
  opacity: 1;
}

.model-selector-modal.closing {
  animation: modalFadeOut 0.2s cubic-bezier(0.55, 0.085, 0.68, 0.53) forwards;
}

.model-selector-content {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 20px;
  box-shadow: 0 8px 32px 0 var(--glass-shadow);
  border: 1px solid var(--glass-border);
  padding: 20px;
  width: 90%;
  max-width: 320px;
  transform: scale(0.8);
  animation: modalSlideIn 0.2s linear forwards;
  transition: background 0.3s ease, border 0.3s ease, box-shadow 0.3s ease;
}

.model-selector-modal.closing .model-selector-content {
  animation: modalSlideOut 0.2s linear forwards;
}

.model-selector-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 15px;
  text-align: center;
}

.model-selector-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.model-option {
  background: var(--white-medium);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 12px 15px;
  color: var(--text-dark);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.model-option:hover {
  background: var(--white-high);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.model-option.selected {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}