/**
 * 解 - 智能多模型聚合解题平台
 * 主样式文件 - 黑色科技感主题
 * 设计语言参考 Google AI Studio
 */

/* ========== CSS 变量定义 ========== */
:root {
  /* 主色调 - 黑色系 */
  --color-bg-primary: #0a0a0a;
  --color-bg-secondary: #111111;
  --color-bg-tertiary: #1a1a1a;
  --color-bg-card: #141414;
  --color-bg-hover: #1f1f1f;
  
  /* 边框颜色 */
  --color-border: #2a2a2a;
  --color-border-light: #333333;
  --color-border-focus: #4a4a4a;
  
  /* 文字颜色 */
  --color-text-primary: #ffffff;
  --color-text-secondary: #a0a0a0;
  --color-text-tertiary: #666666;
  --color-text-muted: #4a4a4a;
  
  /* 强调色 - 银白色系 */
  --color-accent: #d0d0d0;
  --color-accent-hover: #e8e8e8;
  --color-accent-light: rgba(220, 220, 220, 0.15);
  
  /* 渐变色 - 银白渐变 */
  --gradient-primary: linear-gradient(135deg, #a8b5c4 0%, #e8ecf1 100%);
  --gradient-accent: linear-gradient(135deg, #9ca3af 0%, #e5e7eb 100%);
  --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
  
  /* 状态颜色 */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #d0d0d0;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(200, 200, 200, 0.25);
  
  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* 间距 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  
  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease;
  
  /* 字体 */
  --font-family: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ========== 基础重置 ========== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 不规则格子背景效果 - 类似 Google AI Studio */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #0a0a0a;
  background-image: 
    /* 大格子层 */
    linear-gradient(90deg, transparent 0%, transparent 50%, rgba(40, 40, 40, 0.5) 50%, rgba(40, 40, 40, 0.5) 100%),
    linear-gradient(180deg, transparent 0%, transparent 50%, rgba(35, 35, 35, 0.3) 50%, rgba(35, 35, 35, 0.3) 100%),
    /* 中等格子层 */
    linear-gradient(90deg, rgba(50, 50, 50, 0.4) 0%, rgba(50, 50, 50, 0.4) 25%, transparent 25%, transparent 75%, rgba(45, 45, 45, 0.3) 75%),
    linear-gradient(180deg, rgba(55, 55, 55, 0.3) 0%, rgba(55, 55, 55, 0.3) 33%, transparent 33%, transparent 66%, rgba(48, 48, 48, 0.25) 66%),
    /* 小格子细节层 */
    linear-gradient(90deg, rgba(60, 60, 60, 0.2) 0%, rgba(60, 60, 60, 0.2) 12.5%, transparent 12.5%, transparent 37.5%, rgba(58, 58, 58, 0.15) 37.5%, rgba(58, 58, 58, 0.15) 62.5%, transparent 62.5%, transparent 87.5%, rgba(52, 52, 52, 0.2) 87.5%),
    /* 随机高亮点缀 */
    radial-gradient(ellipse 80px 60px at 15% 20%, rgba(70, 70, 70, 0.4) 0%, transparent 100%),
    radial-gradient(ellipse 60px 80px at 85% 30%, rgba(65, 65, 65, 0.35) 0%, transparent 100%),
    radial-gradient(ellipse 100px 70px at 45% 80%, rgba(55, 55, 55, 0.3) 0%, transparent 100%),
    radial-gradient(ellipse 70px 90px at 75% 70%, rgba(60, 60, 60, 0.25) 0%, transparent 100%);
  background-size: 
    200px 200px,
    150px 150px,
    120px 120px,
    100px 100px,
    80px 80px,
    100% 100%,
    100% 100%,
    100% 100%,
    100% 100%;
  pointer-events: none;
  z-index: -1;
}

/* 渐变遮罩 - 格子向下渐变为纯黑 */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    transparent 15%,
    rgba(10, 10, 10, 0.4) 25%,
    rgba(10, 10, 10, 0.7) 35%,
    rgba(10, 10, 10, 0.9) 45%,
    #0a0a0a 55%
  );
  pointer-events: none;
  z-index: -1;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ========== 头部导航 ========== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-xl);
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-text {
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 400;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* 语言选择器 */
.language-selector select {
  appearance: none;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm) var(--spacing-lg) var(--spacing-sm) var(--spacing-md);
  color: var(--color-text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a0a0a0' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
}

.language-selector select:hover {
  border-color: var(--color-border-light);
  background-color: var(--color-bg-hover);
}

.language-selector select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent-light);
}

/* 图标按钮 */
.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-border-light);
  color: var(--color-text-primary);
}

.btn-icon .icon {
  width: 20px;
  height: 20px;
}

/* ========== 主内容区 ========== */
.main-content {
  flex: 1;
  padding: var(--spacing-xl);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* ========== Hero 区域 ========== */
.hero-section {
  text-align: center;
  padding: var(--spacing-2xl) 0;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.gradient-text {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ========== 上传区域 ========== */
.upload-section {
  margin-bottom: var(--spacing-xl);
}

.upload-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.upload-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  background: var(--color-bg-card);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  min-height: 280px;
}

.upload-box:hover,
.upload-box.drag-over {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

.upload-box.drag-over {
  transform: scale(1.01);
}

.upload-icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-tertiary);
  transition: color var(--transition-normal);
}

.upload-box:hover .upload-icon {
  color: var(--color-accent);
}

.upload-icon svg {
  width: 100%;
  height: 100%;
}

.upload-text {
  font-size: 1.125rem;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.upload-hint {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

/* 上传按钮组 - 放在虚线框外部 */
.upload-buttons {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  justify-content: center;
  margin-top: var(--spacing-lg);
}

/* 移动端样式 */
@media (max-width: 768px) {
  .upload-buttons {
    width: 100%;
    justify-content: center;
  }
  
  /* 移动端上传按钮居中显示 */
  .upload-btn {
    width: 100%;
    max-width: 280px;
  }
  
  /* 移动端隐藏拍照按钮 - 系统会自动提供拍照/相册选择 */
  .btn.camera-btn {
    display: none !important;
  }
}

/* ========== 按钮样式 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #1a1a1a;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-border-light);
}

.btn-text {
  background: transparent;
  color: var(--color-accent);
  padding: var(--spacing-xs) var(--spacing-sm);
}

.btn-text:hover {
  background: var(--color-accent-light);
}

.btn-icon-svg {
  width: 18px;
  height: 18px;
}

/* ========== 预览区域 ========== */
.preview-container {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.preview-header h3 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-primary);
}

.btn-close {
  width: 32px;
  height: 32px;
  border: none;
}

.btn-close svg {
  width: 16px;
  height: 16px;
}

.preview-image-wrapper {
  padding: var(--spacing-lg);
  display: flex;
  justify-content: center;
  background: var(--color-bg-secondary);
  max-height: 400px;
  overflow: auto;
}

.preview-image-wrapper img {
  max-width: 100%;
  max-height: 360px;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.preview-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

/* ========== 题目模式切换 ========== */
.mode-toggle {
  display: flex;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  padding: 3px;
  margin-right: auto;
  border: 1px solid var(--color-border);
}

.mode-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.mode-btn:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-hover);
}

.mode-btn.active {
  background: var(--color-accent);
  color: white;
  box-shadow: var(--shadow-sm);
}

.mode-btn.active:hover {
  background: var(--color-accent-hover);
}

.mode-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* 模式按钮 Tooltip */
.mode-btn {
  position: relative;
}

.mode-btn .tooltip {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 0;
  padding: 8px 12px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  pointer-events: none;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

/* 第一个按钮的 tooltip 左对齐 */
.mode-btn:first-child .tooltip {
  left: 0;
  transform: none;
}

.mode-btn:first-child .tooltip::after,
.mode-btn:first-child .tooltip::before {
  left: 20px;
  transform: none;
}

/* 第二个按钮的 tooltip 右对齐 */
.mode-btn:last-child .tooltip {
  left: auto;
  right: 0;
  transform: none;
}

.mode-btn:last-child .tooltip::after,
.mode-btn:last-child .tooltip::before {
  left: auto;
  right: 20px;
  transform: none;
}

.mode-btn .tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 20px;
  border: 6px solid transparent;
  border-top-color: var(--color-border);
}

.mode-btn .tooltip::before {
  content: '';
  position: absolute;
  top: 100%;
  left: 20px;
  border: 5px solid transparent;
  border-top-color: var(--color-bg-tertiary);
  z-index: 1;
}

.mode-btn:hover .tooltip {
  opacity: 1;
  visibility: visible;
}

/* ========== 卡片区域通用样式 ========== */
.section-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-xl);
  overflow: hidden;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
}

.section-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.section-title h2 {
  font-size: 1rem;
  font-weight: 600;
}

.section-icon {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
}

/* ========== OCR 识别区域 ========== */
.ocr-content {
  padding: var(--spacing-lg);
}

.ocr-text {
  min-height: 100px;
  padding: var(--spacing-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text-primary);
  white-space: pre-wrap;
  word-break: break-word;
}

.ocr-text:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent-light);
}

.ocr-text[contenteditable="true"] {
  cursor: text;
}

/* ========== 模型解答区域 ========== */
.model-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.status-text {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.status-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.models-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
}

/* 模型卡片 */
.model-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.model-card:hover {
  border-color: var(--color-border-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.model-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.model-name {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  font-size: 0.9375rem;
}

.model-icon {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: white;
  overflow: hidden;
  flex-shrink: 0;
}

.model-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.model-icon-fallback {
  display: none;
  width: 100%;
  height: 100%;
  align-items: center;
  justify-content: center;
}

/* Fallback 背景色 */
.model-icon.glm .model-icon-fallback { background: linear-gradient(135deg, #6366f1, #4f46e5); }
.model-icon.kimi .model-icon-fallback { background: linear-gradient(135deg, #1a1a2e, #16213e); }
.model-icon.gpt .model-icon-fallback { background: linear-gradient(135deg, #10a37f, #1a7f64); }
.model-icon.deepseek .model-icon-fallback { background: linear-gradient(135deg, #0ea5e9, #06b6d4); }
.model-icon.qwen .model-icon-fallback { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }
.model-icon.doubao .model-icon-fallback { background: linear-gradient(135deg, #ff4d4f, #cf1322); }
.model-icon.gemma .model-icon-fallback { background: linear-gradient(135deg, #4285f4, #34a853); }

.model-status-badge {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
}

.model-status-badge.loading {
  background: var(--color-accent-light);
  color: #a855f7; /* 紫色 */
}

.model-status-badge.success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
}

.model-status-badge.error {
  background: rgba(239, 68, 68, 0.1);
  color: var(--color-error);
}

.model-card-content {
  padding: var(--spacing-md);
  min-height: 120px;
  max-height: 200px;
  overflow-y: auto;
}

.model-answer {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

/* MathJax 公式样式 */
.model-answer .MathJax,
.final-answer .MathJax {
  font-size: 1em !important;
}

.model-answer mjx-container,
.final-answer mjx-container {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
}

.model-answer mjx-container[display="true"],
.final-answer mjx-container[display="true"] {
  margin: 0.5em 0 !important;
  padding: 0.5em;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
}

.model-answer.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-tertiary);
}

.loading-dots {
  display: flex;
  gap: 4px;
}

.loading-dots span {
  width: 6px;
  height: 6px;
  background: var(--color-text-tertiary);
  border-radius: 50%;
  animation: bounce 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1); }
}

/* ========== 最终答案区域 ========== */
.result-card {
  border-color: var(--color-success);
  box-shadow: 0 0 30px rgba(16, 185, 129, 0.1);
}

.result-card .section-header {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.05));
}

.confidence-badge {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) var(--spacing-md);
  background: rgba(16, 185, 129, 0.1);
  border-radius: 100px;
}

.confidence-label {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.confidence-value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-success);
}

.result-content {
  padding: var(--spacing-lg);
}

.final-answer {
  padding: var(--spacing-lg);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
  max-height: 400px;
  overflow-y: auto;
}

.final-answer h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin: var(--spacing-md) 0 var(--spacing-sm);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid var(--color-border);
}

.final-answer h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-accent);
  margin: var(--spacing-sm) 0;
}

.final-answer p {
  margin: var(--spacing-sm) 0;
  color: var(--color-text-secondary);
}

.final-answer li {
  margin: var(--spacing-xs) 0;
  padding-left: var(--spacing-sm);
  color: var(--color-text-secondary);
}

/* MathJax 公式样式 */
.final-answer .MathJax {
  font-size: 1.1em !important;
}

.model-answer h3,
.model-answer h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin: var(--spacing-xs) 0;
}

.model-answer p {
  margin: var(--spacing-xs) 0;
}

.answer-analysis {
  padding: var(--spacing-md);
  background: rgba(200, 200, 200, 0.08);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.answer-analysis h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.answer-analysis p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.result-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

/* ========== 页脚 ========== */
.footer {
  padding: var(--spacing-lg) var(--spacing-xl);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.footer-text {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

.footer-divider {
  margin: 0 var(--spacing-sm);
  color: var(--color-border);
}

/* ========== Toast 通知 ========== */
.toast-container {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 10000; /* 确保在模态框之上 */
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.3s ease;
}

.toast.success { border-left: 3px solid var(--color-success); }
.toast.error { border-left: 3px solid var(--color-error); }
.toast.info { border-left: 3px solid var(--color-info); }

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* ========== 图片裁切模态框 ========== */
.crop-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  animation: fadeIn 0.2s ease;
}

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

.crop-modal-content {
  background: var(--color-bg-primary);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 900px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.crop-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg) var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
}

.crop-modal-header h3 {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin: 0;
}

.crop-modal-header .section-icon {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
}

.crop-modal-body {
  flex: 1;
  padding: var(--spacing-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.crop-container {
  width: 100%;
  max-height: 60vh;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.crop-container img {
  max-width: 100%;
  max-height: 60vh;
  display: block;
}

.crop-hint {
  margin-top: var(--spacing-md);
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  text-align: center;
}

.crop-modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) var(--spacing-xl);
  border-top: 1px solid var(--color-border);
}

/* Cropper.js 自定义样式 */
.cropper-container {
  /* 替换丑陋的灰白格子背景为渐变背景 */
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%) !important;
}

.cropper-bg {
  /* 隐藏默认的透明背景格子 */
  background: transparent !important;
}

.cropper-modal {
  /* 裁切区域外的遮罩 - 使用半透明深色 */
  background-color: rgba(0, 0, 0, 0.6) !important;
  backdrop-filter: blur(2px);
}

.cropper-view-box,
.cropper-face {
  border-radius: var(--radius-sm);
}

.cropper-view-box {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
  box-shadow: 0 0 20px rgba(200, 200, 200, 0.4);
}

.cropper-line {
  background-color: var(--color-accent);
}

.cropper-point {
  background-color: var(--color-accent);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  box-shadow: 0 0 6px rgba(200, 200, 200, 0.6);
}

.cropper-point.point-se {
  width: 12px;
  height: 12px;
}

.cropper-dashed {
  border-color: rgba(255, 255, 255, 0.5);
}

/* 裁切框内的网格线 */
.cropper-center {
  display: none;
}

/* ========== 响应式设计 ========== */
@media (max-width: 768px) {
  .header {
    padding: var(--spacing-md);
  }
  
  .logo-subtitle {
    display: none;
  }
  
  .main-content {
    padding: var(--spacing-md);
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-description {
    font-size: 1rem;
  }
  
  .upload-box {
    padding: var(--spacing-xl);
    min-height: 220px;
  }
  
  .models-grid {
    grid-template-columns: 1fr;
  }
  
  .preview-actions,
  .result-actions {
    flex-direction: column;
  }
  
  .preview-actions .btn,
  .result-actions .btn {
    width: 100%;
  }
  
  /* 裁切模态框移动端适配 */
  .crop-modal {
    padding: 0;
  }
  
  .crop-modal-content {
    max-height: 100vh;
    height: 100vh;
    border-radius: 0;
  }
  
  .crop-modal-header {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .crop-modal-header h3 {
    font-size: 1rem;
  }
  
  .crop-modal-body {
    padding: var(--spacing-sm);
    flex: 1;
  }
  
  .crop-container {
    max-height: 65vh;
    height: 65vh;
  }
  
  .crop-container img {
    max-height: 65vh;
  }
  
  .crop-hint {
    margin-top: var(--spacing-sm);
    font-size: 0.75rem;
  }
  
  .crop-modal-footer {
    padding: var(--spacing-sm) var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }
  
  .crop-modal-footer .btn {
    flex: 1;
    min-width: 80px;
    padding: var(--spacing-sm);
    font-size: 0.875rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.75rem;
  }
  
  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
}

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

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}

/* ========== 选中文本样式 ========== */
::selection {
  background: var(--color-accent);
  color: #1a1a1a;
}

/* ========== 登录按钮样式 ========== */
.btn-login {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--gradient-primary);
  color: #1a1a1a;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-login:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.btn-login .btn-icon-svg {
  width: 16px;
  height: 16px;
}

/* ========== 登录模态框样式 ========== */
.login-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
}

.login-modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
}

.login-modal-content {
  position: relative;
  width: 100%;
  max-width: 420px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), 0 0 60px rgba(200, 200, 200, 0.1);
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.login-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.login-title {
  font-size: 1.5rem;
  font-weight: 700;
}

.login-modal-body {
  padding: var(--spacing-lg);
}

/* 表单样式 */
.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 12px;
  width: 18px;
  height: 18px;
  color: var(--color-text-tertiary);
  pointer-events: none;
}

.input-wrapper input {
  width: 100%;
  padding: 12px 12px 12px 42px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
}

.input-wrapper input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

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

.toggle-password {
  position: absolute;
  right: 8px;
  padding: 6px;
  background: transparent;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
}

.toggle-password:hover {
  color: var(--color-text-secondary);
}

.toggle-password svg {
  width: 18px;
  height: 18px;
}

/* 表单选项 */
.form-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
}

.checkbox-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  cursor: pointer;
  color: var(--color-text-secondary);
}

.checkbox-wrapper input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-accent);
}

.forgot-password {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.forgot-password:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* 提交按钮 */
.btn-full {
  width: 100%;
  justify-content: center;
  padding: 14px;
  font-size: 1rem;
}

/* 分隔线 */
.login-divider {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
}

.login-divider::before,
.login-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* 社交登录 */
.social-login {
  display: flex;
  gap: var(--spacing-sm);
}

.btn-social {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 12px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-social:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-border-light);
}

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

.btn-wechat:hover {
  border-color: #07c160;
  color: #07c160;
}

.btn-github:hover {
  border-color: #6e5494;
  color: #a78bfa;
}

/* 底部链接 */
.login-footer {
  margin-top: var(--spacing-lg);
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.register-link {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  margin-left: var(--spacing-xs);
}

.register-link:hover {
  text-decoration: underline;
}

/* 服务条款链接 */
.terms-link {
  color: var(--color-accent);
  text-decoration: none;
  margin-left: 4px;
}

.terms-link:hover {
  text-decoration: underline;
}

/* 密码强度指示器 */
.password-strength {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xs);
}

.strength-bar {
  flex: 1;
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
}

.strength-bar span {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 2px;
  transition: all var(--transition-normal);
}

.strength-bar.weak span {
  width: 33%;
  background: var(--color-error);
}

.strength-bar.medium span {
  width: 66%;
  background: var(--color-warning);
}

.strength-bar.strong span {
  width: 100%;
  background: var(--color-success);
}

.strength-text {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  min-width: 60px;
}

.strength-text.weak {
  color: var(--color-error);
}

.strength-text.medium {
  color: var(--color-warning);
}

.strength-text.strong {
  color: var(--color-success);
}

/* ========== 用户菜单样式 ========== */
.user-menu {
  position: relative;
}

.user-avatar-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 6px 12px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.user-avatar-btn:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-border-light);
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #1a1a1a;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
}

.user-name {
  font-size: 0.875rem;
  font-weight: 500;
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dropdown-arrow {
  width: 16px;
  height: 16px;
  color: var(--color-text-tertiary);
  transition: transform var(--transition-fast);
}

.user-avatar-btn:hover .dropdown-arrow {
  color: var(--color-text-secondary);
}

.user-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 240px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  z-index: 100;
}

.user-dropdown.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
}

.dropdown-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #1a1a1a;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 600;
  flex-shrink: 0;
}

.dropdown-info {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.dropdown-username {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dropdown-email {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dropdown-divider {
  height: 1px;
  background: var(--color-border);
  margin: 0;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--color-bg-hover);
  color: var(--color-text-primary);
}

.dropdown-item svg {
  width: 18px;
  height: 18px;
}

/* ========== OCR 加载和错误状态 ========== */
.ocr-loading {
  color: var(--color-text-secondary);
  font-style: italic;
}

.ocr-loading .loading-dots::after {
  content: '';
  animation: loadingDots 1.5s infinite;
}

@keyframes loadingDots {
  0% { content: ''; }
  25% { content: '.'; }
  50% { content: '..'; }
  75% { content: '...'; }
}

.ocr-error {
  color: var(--color-error);
  font-weight: 500;
}

.ocr-hint {
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
}

/* ========== 验证码输入框样式 ========== */
.input-with-btn {
  display: flex;
  gap: var(--spacing-sm);
}

.input-with-btn input {
  flex: 1;
}

.btn-send-code {
  flex-shrink: 0;
  padding: 0 var(--spacing-md);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-send-code:hover:not(:disabled) {
  background: var(--color-bg-hover);
  border-color: var(--color-primary);
}

.btn-send-code:disabled {
  color: var(--color-text-tertiary);
  cursor: not-allowed;
  opacity: 0.7;
}

/* ========== 输入框验证状态 ========== */
.input-valid {
  border-color: var(--color-success) !important;
}

.input-invalid {
  border-color: var(--color-error) !important;
}

.input-hint {
  font-size: 0.75rem;
  margin-top: var(--spacing-xs);
  min-height: 1rem;
}

.hint-success {
  color: var(--color-success);
}

.hint-error {
  color: var(--color-error);
}

/* 移动端适配 */
@media (max-width: 480px) {
  .user-name {
    display: none;
  }
  
  .user-avatar-btn {
    padding: 6px;
  }
  
  .login-modal-content {
    max-width: 100%;
    margin: var(--spacing-md);
    border-radius: var(--radius-md);
  }
  
  .social-login {
    flex-direction: column;
  }
  
  .btn-login span {
    display: none;
  }
  
  .btn-login {
    padding: var(--spacing-sm);
  }
}