/* ========================================
   AI Chat - Modern Green Theme
   现代化绿色主题 - AI 对话界面
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800;900&family=Plus+Jakarta+Sans:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;700&display=swap');

/* ========================================
   CSS Variables - 绿色系配色方案
   ======================================== */
:root {
  /* 绿色系配色 - 与首页一致 */
  --ai-color-primary: #10b981;
  --ai-color-primary-dark: #059669;
  --ai-color-primary-light: #34d399;
  --ai-color-secondary: #14b8a6;

  /* 渐变 */
  --ai-gradient-primary: linear-gradient(135deg, #10b981 0%, #14b8a6 100%);
  --ai-gradient-hero: linear-gradient(180deg, #ecfdf5 0%, #d1fae5 100%);
  --ai-gradient-card: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(255,255,255,0.7) 100%);
  --ai-gradient-glow: radial-gradient(circle at center, rgba(16, 185, 129, 0.15) 0%, transparent 70%);

  /* 背景色 */
  --ai-bg-primary: #ffffff;
  --ai-bg-secondary: #f0fdf4;
  --ai-bg-glass: rgba(255, 255, 255, 0.85);
  --ai-bg-glass-dark: rgba(255, 255, 255, 0.95);

  /* 文字颜色 */
  --ai-text-primary: #022c22;
  --ai-text-secondary: #047857;
  --ai-text-muted: #64748b;
  --ai-text-light: #94a3b8;

  /* 阴影 - 绿色系 */
  --ai-shadow-sm: 0 1px 2px 0 rgba(16, 185, 129, 0.05);
  --ai-shadow-md: 0 4px 6px -1px rgba(16, 185, 129, 0.1), 0 2px 4px -2px rgba(16, 185, 129, 0.1);
  --ai-shadow-lg: 0 10px 15px -3px rgba(16, 185, 129, 0.15), 0 4px 6px -4px rgba(16, 185, 129, 0.1);
  --ai-shadow-xl: 0 20px 25px -5px rgba(16, 185, 129, 0.2), 0 8px 10px -6px rgba(16, 185, 129, 0.1);

  /* 间距 */
  --ai-spacing-xs: 0.5rem;
  --ai-spacing-sm: 0.75rem;
  --ai-spacing-md: 1rem;
  --ai-spacing-lg: 1.5rem;
  --ai-spacing-xl: 2rem;
  --ai-spacing-2xl: 3rem;

  /* 圆角 */
  --ai-radius-sm: 0.5rem;
  --ai-radius-md: 0.75rem;
  --ai-radius-lg: 1rem;
  --ai-radius-xl: 1.5rem;
  --ai-radius-full: 9999px;

  /* 动画 */
  --ai-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --ai-transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --ai-transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  /* 字体 */
  --ai-font-display: 'Outfit', sans-serif;
  --ai-font-body: 'Plus Jakarta Sans', 'Noto Sans SC', sans-serif;
}

/* ========================================
   全局样式
   ======================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--ai-font-body);
  background: var(--ai-gradient-hero);
  color: var(--ai-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   背景装饰 - 绿色系粒子效果
   ======================================== */
.ai-chat-container {
  min-height: 100vh;
  position: relative;
  background: var(--ai-gradient-hero);
}

/* 网格背景 */
.bg-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(rgba(16, 185, 129, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 185, 129, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: 1;
}

/* 柔和光晕效果 */
.bg-scanline {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at center, rgba(16, 185, 129, 0.05) 0%, transparent 70%);
  pointer-events: none;
  animation: ai-pulse 8s ease-in-out infinite;
  z-index: 2;
}

@keyframes ai-pulse {
  0%, 100% {
    opacity: 0.3;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(1.1);
  }
}

/* ========================================
   头部导航 - 与首页风格一致
   ======================================== */
.chat-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ai-bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(16, 185, 129, 0.1);
  box-shadow: var(--ai-shadow-sm);
  transition: all var(--ai-transition-base);
}

.chat-header.scrolled {
  background: var(--ai-bg-glass-dark);
  box-shadow: var(--ai-shadow-md);
}

.header-content {
  max-width: 1800px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ai-gradient-primary);
  border-radius: var(--ai-radius-md);
  color: white;
  box-shadow: var(--ai-shadow-md);
  transition: all var(--ai-transition-base);
}

.logo-icon:hover {
  transform: scale(1.05);
  box-shadow: var(--ai-shadow-lg);
}

.logo-icon svg {
  width: 28px;
  height: 28px;
}

.logo-text {
  font-family: var(--ai-font-display);
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--ai-gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1px;
}

.header-meta {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--ai-gradient-primary);
  color: white;
  border-radius: var(--ai-radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  box-shadow: var(--ai-shadow-md);
}

.status-dot {
  width: 8px;
  height: 8px;
  background: white;
  border-radius: 50%;
  animation: ai-blink 2s ease-in-out infinite;
}

@keyframes ai-blink {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(0.8);
  }
}

/* ========================================
   布局结构
   ======================================== */
.chat-layout {
  position: relative;
  z-index: 10;
  max-width: 1800px;
  margin: 0 auto;
  padding: 2rem;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 2rem;
  height: calc(100vh - 88px);
  max-height: calc(100vh - 88px);
}

/* ========================================
   左侧设置面板 - 毛玻璃卡片
   ======================================== */
.settings-panel {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.panel-section {
  background: var(--ai-bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--ai-radius-xl);
  padding: 1.5rem;
  transition: all var(--ai-transition-base);
}

.panel-section:hover {
  border-color: var(--ai-color-primary);
  box-shadow: var(--ai-shadow-lg);
  transform: translateY(-2px);
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--ai-font-display);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--ai-color-primary);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.section-title svg {
  width: 20px;
  height: 20px;
}

/* 模式选择器 */
.mode-selector {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.mode-option {
  cursor: pointer;
  position: relative;
}

.mode-option input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.mode-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--ai-bg-secondary);
  border: 2px solid transparent;
  border-radius: var(--ai-radius-lg);
  transition: all var(--ai-transition-base);
}

.mode-option:hover .mode-card {
  background: var(--ai-color-primary-light);
  background-opacity: 0.1;
  border-color: rgba(16, 185, 129, 0.3);
  transform: translateX(4px);
}

.mode-option input[type="radio"]:checked ~ .mode-card {
  background: var(--ai-gradient-primary);
  border-color: var(--ai-color-primary);
  box-shadow: var(--ai-shadow-lg);
}

.mode-option input[type="radio"]:checked ~ .mode-card .mode-name,
.mode-option input[type="radio"]:checked ~ .mode-card .mode-desc {
  color: white;
}

.mode-icon {
  font-size: 1.5rem;
}

.mode-name {
  font-family: var(--ai-font-display);
  font-weight: 600;
  color: var(--ai-text-primary);
  display: block;
}

.mode-desc {
  font-size: 0.75rem;
  color: var(--ai-text-muted);
  display: block;
}

/* 选项列表 */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.option-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: 0.75rem;
  background: var(--ai-bg-secondary);
  border-radius: var(--ai-radius-md);
  transition: all var(--ai-transition-base);
}

.option-item:hover {
  background: var(--ai-color-primary-light);
  background-opacity: 0.2;
  transform: translateX(4px);
}

.option-item input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.option-text {
  font-size: 0.875rem;
  color: var(--ai-text-secondary);
  font-weight: 500;
}

.option-toggle {
  width: 44px;
  height: 24px;
  background: var(--ai-text-muted);
  border-radius: var(--ai-radius-full);
  position: relative;
  transition: all var(--ai-transition-base);
}

.option-toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: white;
  border-radius: 50%;
  transition: all var(--ai-transition-base);
  box-shadow: var(--ai-shadow-sm);
}

.option-item input[type="checkbox"]:checked ~ .option-toggle {
  background: var(--ai-color-primary);
}

.option-item input[type="checkbox"]:checked ~ .option-toggle::after {
  left: 22px;
  background: white;
  box-shadow: var(--ai-shadow-md);
}

/* 模型选择 */
.model-select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--ai-bg-secondary);
  border: 2px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--ai-radius-md);
  color: var(--ai-text-primary);
  font-family: var(--ai-font-body);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--ai-transition-base);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2310b981'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1rem;
  padding-right: 3rem;
}

.model-select:hover {
  border-color: var(--ai-color-primary);
  background-color: var(--ai-color-primary-light);
  background-opacity: 0.1;
}

.model-select:focus {
  outline: none;
  border-color: var(--ai-color-primary);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

/* 统计面板 */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.stat-item {
  text-align: center;
  padding: 1rem;
  background: var(--ai-bg-secondary);
  border-radius: var(--ai-radius-lg);
  transition: all var(--ai-transition-base);
}

.stat-item:hover {
  background: var(--ai-color-primary-light);
  background-opacity: 0.2;
  transform: translateY(-2px);
}

.stat-value {
  display: block;
  font-family: var(--ai-font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ai-color-primary);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--ai-text-muted);
  display: block;
  margin-top: 0.25rem;
  font-weight: 500;
}

/* ========================================
   主聊天区域 - 毛玻璃容器
   ======================================== */
.chat-main {
  display: flex;
  flex-direction: column;
  background: var(--ai-bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--ai-radius-xl);
  overflow: hidden;
  height: 100%;
  max-height: 100%;
  box-shadow: var(--ai-shadow-lg);
}

/* ========================================
   翻译模式
   ======================================== */
.translate-container {
  padding: 2rem;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.translate-box {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.lang-selector {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.lang-select {
  flex: 1;
  padding: 0.75rem 1rem;
  background: var(--ai-bg-secondary);
  border: 2px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--ai-radius-md);
  color: var(--ai-text-primary);
  font-family: var(--ai-font-body);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--ai-transition-base);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2310b981'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1rem;
  padding-right: 3rem;
}

.lang-select:hover {
  border-color: var(--ai-color-primary);
}

.lang-select:focus {
  outline: none;
  border-color: var(--ai-color-primary);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.swap-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ai-gradient-primary);
  border: none;
  border-radius: var(--ai-radius-md);
  color: white;
  cursor: pointer;
  transition: all var(--ai-transition-base);
  box-shadow: var(--ai-shadow-md);
}

.swap-btn:hover {
  transform: rotate(180deg);
  box-shadow: var(--ai-shadow-lg);
}

.swap-btn svg {
  width: 20px;
  height: 20px;
}

.translate-inputs {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: start;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

#translate-input,
.output-area {
  width: 100%;
  padding: 1rem;
  background: var(--ai-bg-secondary);
  border: 2px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--ai-radius-lg);
  color: var(--ai-text-primary);
  font-family: var(--ai-font-body);
  font-size: 0.9375rem;
  line-height: 1.8;
  resize: none;
  transition: all var(--ai-transition-base);
}

#translate-input:focus,
.output-area:focus {
  outline: none;
  border-color: var(--ai-color-primary);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.output-area {
  min-height: 200px;
  max-height: 400px;
  overflow-y: auto;
}

.output-area .placeholder {
  color: var(--ai-text-muted);
}

.input-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--ai-text-muted);
}

.char-count {
  font-family: var(--ai-font-display);
  font-weight: 600;
}

.action-btn {
  padding: 0.5rem 1rem;
  background: transparent;
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--ai-radius-md);
  color: var(--ai-color-primary);
  font-family: var(--ai-font-display);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--ai-transition-base);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.action-btn:hover {
  background: var(--ai-gradient-primary);
  border-color: transparent;
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--ai-shadow-md);
}

.action-btn svg {
  width: 14px;
  height: 14px;
}

.translate-action {
  display: flex;
  align-items: center;
  padding-top: 2rem;
}

.translate-btn {
  width: 60px;
  height: 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--ai-gradient-primary);
  border: none;
  border-radius: 50%;
  color: white;
  font-family: var(--ai-font-display);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--ai-transition-base);
  box-shadow: var(--ai-shadow-lg);
}

.translate-btn:hover {
  transform: scale(1.1);
  box-shadow: var(--ai-shadow-xl);
}

.translate-btn svg {
  width: 24px;
  height: 24px;
}

/* ========================================
   普通对话模式
   ======================================== */
.chat-container {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.chat-messages {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* 消息样式 */
.message {
  display: flex;
  gap: 1rem;
  animation: ai-message-slide 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes ai-message-slide {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message.user {
  flex-direction: row-reverse;
}

.message-content {
  max-width: 70%;
  padding: 1rem 1.5rem;
  border-radius: var(--ai-radius-xl);
  position: relative;
  box-shadow: var(--ai-shadow-sm);
}

.message.assistant .message-content {
  background: var(--ai-bg-secondary);
  border: 1px solid rgba(16, 185, 129, 0.2);
  color: var(--ai-text-primary);
}

.message.user .message-content {
  background: var(--ai-gradient-primary);
  color: white;
  border: none;
  box-shadow: var(--ai-shadow-md);
}

.message.system .message-content {
  max-width: 100%;
  background: transparent;
  border: none;
  padding: 0;
  box-shadow: none;
}

.message-content {
  word-wrap: break-word;
  line-height: 1.6;
}

.message-content p {
  margin-bottom: 0.5rem;
}

.message-content p:last-child {
  margin-bottom: 0;
}

.message-content pre {
  background: rgba(0, 0, 0, 0.05);
  border-radius: var(--ai-radius-md);
  padding: 1rem;
  overflow-x: auto;
  margin: 0.5rem 0;
  border: 1px solid rgba(16, 185, 129, 0.1);
}

.message-content code {
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
  font-size: 0.875rem;
  background: rgba(16, 185, 129, 0.1);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
}

.message-content pre code {
  background: transparent;
  padding: 0;
}

/* 欢迎消息 */
.welcome-message {
  text-align: center;
  padding: 3rem 2rem;
}

.welcome-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  animation: ai-bounce 1s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.welcome-message h3 {
  font-family: var(--ai-font-display);
  font-size: 1.75rem;
  font-weight: 700;
  background: var(--ai-gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.welcome-message p {
  color: var(--ai-text-secondary);
  margin-bottom: 0.5rem;
  font-size: 1.025rem;
}

.feature-list {
  list-style: none;
  display: inline-flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 1.5rem 0;
  text-align: left;
}

.feature-list li {
  padding: 0.75rem 1rem;
  background: var(--ai-bg-secondary);
  border-radius: var(--ai-radius-md);
  color: var(--ai-text-secondary);
  font-weight: 500;
  transition: all var(--ai-transition-base);
}

.feature-list li:hover {
  background: var(--ai-color-primary-light);
  background-opacity: 0.2;
  transform: translateX(8px);
}

.hint {
  font-size: 0.875rem;
  color: var(--ai-text-muted);
  margin-top: 1.5rem !important;
  font-weight: 500;
}

/* 输入区域 */
.chat-input-area {
  padding: 1.5rem 2rem;
  border-top: 1px solid rgba(16, 185, 129, 0.1);
  background: var(--ai-bg-glass-dark);
}

.input-container {
  position: relative;
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  background: var(--ai-bg-secondary);
  border: 2px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--ai-radius-xl);
  padding: 0.75rem;
  transition: all var(--ai-transition-base);
}

.input-container:focus-within {
  border-color: var(--ai-color-primary);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

#chat-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--ai-text-primary);
  font-family: var(--ai-font-body);
  font-size: 0.9375rem;
  line-height: 1.6;
  resize: none;
  min-height: 44px;
  max-height: 200px;
}

#chat-input:focus {
  outline: none;
}

#chat-input::placeholder {
  color: var(--ai-text-muted);
}

.input-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.input-hint {
  font-size: 0.75rem;
  color: var(--ai-text-muted);
  font-family: var(--ai-font-display);
  font-weight: 600;
}

.send-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ai-gradient-primary);
  border: none;
  border-radius: var(--ai-radius-lg);
  color: white;
  cursor: pointer;
  transition: all var(--ai-transition-base);
  box-shadow: var(--ai-shadow-md);
}

.send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.send-btn:not(:disabled):hover {
  transform: scale(1.05);
  box-shadow: var(--ai-shadow-lg);
}

.send-btn svg {
  width: 20px;
  height: 20px;
}

/* ========================================
   加载覆盖层
   ======================================== */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 1rem;
  z-index: 1000;
}

.loading-overlay.active {
  display: flex;
}

.loading-spinner {
  width: 60px;
  height: 60px;
  border: 3px solid rgba(16, 185, 129, 0.1);
  border-top-color: var(--ai-color-primary);
  border-radius: 50%;
  animation: ai-spin 0.8s linear infinite;
}

@keyframes ai-spin {
  to {
    transform: rotate(360deg);
  }
}

.loading-text {
  font-family: var(--ai-font-display);
  font-size: 0.875rem;
  color: var(--ai-color-primary);
  font-weight: 600;
  letter-spacing: 1px;
}

/* ========================================
   Toast 通知
   ======================================== */
.toast-container {
  position: fixed;
  top: 100px;
  right: 2rem;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  padding: 1rem 1.5rem;
  background: var(--ai-bg-glass-dark);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--ai-radius-lg);
  box-shadow: var(--ai-shadow-lg);
  animation: ai-toast-slide 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 300px;
}

@keyframes ai-toast-slide {
  from {
    opacity: 0;
    transform: translateX(100px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast.success {
  border-color: var(--ai-color-primary);
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(20, 184, 166, 0.1));
}

.toast.error {
  border-color: #ef4444;
  background: rgba(239, 68, 68, 0.1);
}

.toast-icon {
  font-size: 1.25rem;
}

.toast-message {
  flex: 1;
  font-size: 0.875rem;
  color: var(--ai-text-primary);
  font-weight: 500;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
  .chat-layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    padding: 1rem;
  }

  .settings-panel {
    order: 2;
    height: auto;
    max-height: none;
  }

  .chat-main {
    order: 1;
    height: calc(100vh - 88px - 2rem);
    max-height: calc(100vh - 88px - 2rem);
  }

  .translate-inputs {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
  }

  .translate-action {
    padding-top: 1rem;
  }

  .translate-btn {
    width: 100%;
    height: 50px;
    flex-direction: row;
  }

  .message-content {
    max-width: 85%;
  }
}

@media (max-width: 640px) {
  .header-content {
    padding: 1rem;
  }

  .logo-text {
    font-size: 1rem;
  }

  .status-badge {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
  }

  .chat-layout {
    padding: 0.5rem;
    height: calc(100vh - 88px);
    max-height: calc(100vh - 88px);
  }

  .chat-main {
    height: calc(100vh - 88px - 1rem);
    max-height: calc(100vh - 88px - 1rem);
  }

  .chat-messages {
    padding: 1rem;
  }

  .chat-input-area {
    padding: 1rem;
  }

  .message-content {
    max-width: 90%;
  }

  .toast-container {
    right: 1rem;
    left: 1rem;
  }

  .toast {
    min-width: auto;
  }

  .section-title {
    font-size: 0.8125rem;
  }

  .panel-section {
    padding: 1rem;
  }
}

/* ========================================
   滚动条样式 - 绿色系
   ======================================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--ai-bg-secondary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb {
  background: var(--ai-color-primary);
  border-radius: 4px;
  border: 2px solid var(--ai-bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--ai-color-primary-dark);
}

/* ========================================
   可访问性增强
   ======================================== */
:focus-visible {
  outline: 2px solid var(--ai-color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* 选中文本样式 */
::selection {
  background: var(--ai-color-primary);
  color: white;
}

::-moz-selection {
  background: var(--ai-color-primary);
  color: white;
}

/* ========================================
   动画优化 - 尊重用户偏好
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .bg-scanline {
    display: none;
  }

  .message {
    opacity: 1 !important;
    transform: none !important;
  }
}