/* ============================================
   图片水印工具 - 样式表
   设计系统：Apple macOS / iOS 风格
   ============================================ */

/* === CSS 变量（设计令牌） === */
:root {
  /* 颜色系统 - 暗色模式（默认） */
  --bg-primary: #000000;
  --bg-secondary: #1c1c1e;
  --bg-elevated: #2c2c2e;
  --bg-glass: rgba(28, 28, 30, 0.7);
  --bg-glass-hover: rgba(44, 44, 46, 0.7);
  --bg-input: #1c1c1e;
  --bg-input-focus: #2c2c2e;

  --text-primary: #f5f5f7;
  --text-secondary: #86868b;
  --text-tertiary: #6e6e73;
  --text-accent: #0a84ff;

  --border-color: rgba(255, 255, 255, 0.15);
  --border-color-hover: rgba(255, 255, 255, 0.25);
  --border-focus: #0a84ff;

  --accent-primary: #0a84ff;
  --accent-secondary: #5e5ce6;
  --accent-gradient: #0a84ff;
  --accent-glow: transparent;

  --danger: #ff453a;
  --success: #32d74b;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: none;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* 间距 */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-2xl: 32px;

  /* 动画 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.25, 0.1, 0.25, 1);

  /* 字体 */
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 布局 */
  --header-height: 52px;
  --footer-height: 0px;
  --panel-width: 320px;
}

/* 亮色模式 */
[data-theme="light"] {
  --bg-primary: #f5f5f7;
  --bg-secondary: #ffffff;
  --bg-elevated: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.8);
  --bg-glass-hover: rgba(245, 245, 247, 0.8);
  --bg-input: #ffffff;
  --bg-input-focus: #ffffff;

  --text-primary: #1d1d1f;
  --text-secondary: #86868b;
  --text-tertiary: #a1a1a6;
  --text-accent: #0066cc;

  --border-color: rgba(0, 0, 0, 0.1);
  --border-color-hover: rgba(0, 0, 0, 0.2);
  --border-focus: #0066cc;

  --accent-primary: #0071e3;
  --accent-secondary: #5e5ce6;
  --accent-gradient: #0071e3;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08);
  
  --danger: #e30000;
  --success: #34c759;
}

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

/* 强制隐藏，修复 flex 覆盖 hidden 属性的问题 */
[hidden] {
  display: none !important;
}

html {
  height: 100%;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  height: 100%;
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* === 滚动条（自定义） === */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

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

/* === 顶部导航栏 === */
.header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-xl);
  background: var(--bg-glass);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
}

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

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

.logo-icon {
  width: 20px;
  height: 20px;
  color: var(--text-primary);
}

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

.logo h1 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  line-height: 1;
  margin: 0;
  margin-right: 4px;
}

/* 隐私徽章（Apple 安全风） */
.privacy-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 0.68rem;
  line-height: 1;
  font-weight: 500;
  color: #34c759; /* Apple Green */
  background: rgba(52, 199, 89, 0.1);
  border: 1px solid rgba(52, 199, 89, 0.2);
  padding: 4px 8px;
  border-radius: 12px;
  letter-spacing: 0.02em;
  transform: translateY(1px); /* 微调视觉居中 */
}

[data-theme="dark"] .privacy-badge {
  color: #30d158;
  background: rgba(48, 209, 88, 0.15);
  border-color: rgba(48, 209, 88, 0.25);
}

.privacy-icon {
  width: 10px;
  height: 10px;
  stroke: currentColor;
}

/* 主题切换按钮 */
.btn-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-normal);
}

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

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

/* 主题图标切换 */
.icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* === 主内容区域 === */
.main-content {
  flex: 1;
  display: flex;
  overflow: hidden;
  height: calc(100vh - var(--header-height) - var(--footer-height));
}

/* === 左侧控制面板 === */
.control-panel {
  width: var(--panel-width);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

/* 可滚动内容区 */
.panel-scroll {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-lg) var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* 专门针对操作面板滚动条变细 */
.panel-scroll::-webkit-scrollbar {
  width: 2.5px; /* 改得更细，原全局为 6px */
}
.panel-scroll::-webkit-scrollbar-thumb {
  background: rgba(134, 134, 139, 0.4); /* 半透明灰色 */
  border-radius: 4px;
}
.panel-scroll::-webkit-scrollbar-thumb:hover {
  background: rgba(134, 134, 139, 0.8);
}

/* 面板分区 */
.panel-section {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15); /* 加深整体阴影 */
  border: 1px solid rgba(255, 255, 255, 0.08); /* 边缘高光 */
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.panel-section:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

[data-theme="light"] .panel-section {
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

[data-theme="light"] .panel-section:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.section-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.section-icon {
  width: 14px;
  height: 14px;
  color: var(--text-secondary);
}

/* === 拖拽上传区域 === */
.drop-zone {
  border: 1.5px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  background: var(--bg-input);
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent-primary);
  background: var(--border-color);
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.drop-icon {
  width: 32px;
  height: 32px;
  color: var(--text-secondary);
  transition: color var(--transition-normal);
}

.drop-zone:hover .drop-icon {
  color: var(--accent-primary);
}

.drop-text {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
}

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

.drop-formats {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  margin-top: var(--space-xs);
}

/* 已上传文件信息 */
.file-info {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--border-color);
  border-radius: var(--radius-md);
}

.file-info-preview {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  border: 1px solid var(--border-color);
}

.file-info-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.file-info-detail {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.file-name {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-size {
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.btn-icon-small {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.btn-icon-small:hover {
  background: rgba(255, 59, 48, 0.1);
  color: var(--danger);
}

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

/* === 表单控件 === */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.value-display {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  background: none;
  padding: 0;
}

/* 文本输入 & 文本域 */
.form-input {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 0.85rem;
  resize: vertical;
  transition: all var(--transition-normal);
  outline: none;
}

.form-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(10, 132, 255, 0.2);
}

[data-theme="light"] .form-input:focus {
  box-shadow: 0 0 0 2px rgba(0, 113, 227, 0.2);
}

.form-input::placeholder {
  color: var(--text-secondary);
}

/* 下拉选择 */
.form-select {
  width: 100%;
  padding: 6px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
  transition: all var(--transition-normal);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%2386868b' stroke-width='2.5'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
}

.form-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(10, 132, 255, 0.2);
}

/* 滑块（range） */
.form-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--border-color);
  border-radius: 4px;
  outline: none;
  cursor: pointer;
  margin: 10px 0;
  overflow: visible;
}

.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #ffffff;
  cursor: pointer;
  border: 1px solid rgba(0,0,0,0.1);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  transition: transform var(--transition-fast);
}

.form-range::-webkit-slider-thumb:active {
  transform: scale(1.1);
}

/* 颜色选择器行 */
.color-picker-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.form-color {
  -webkit-appearance: none;
  appearance: none;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
  background: none;
  padding: 0;
  overflow: hidden;
}

.form-color::-webkit-color-swatch-wrapper {
  padding: 0;
}

.form-color::-webkit-color-swatch {
  border: none;
  border-radius: 50%;
}

.color-presets {
  display: flex;
  gap: var(--space-sm);
}

.color-preset {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.1);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.color-preset:hover {
  transform: scale(1.15);
}

[data-theme="dark"] .color-preset {
  border-color: rgba(255,255,255,0.1);
}

/* 模板标签（chips） */
.template-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chip {
  padding: 4px 10px;
  border: 1px solid var(--border-color);
  border-radius: 14px;
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-family);
  white-space: nowrap;
}

.chip:hover {
  background: var(--border-color-hover);
}

.chip.active {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

/* === 折叠面板样式（Apple Disclosure 风格） === */
.export-details {
  margin-top: var(--space-sm);
}

.export-details summary {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.export-details summary:hover {
  background: var(--border-color);
  color: var(--text-primary);
}

.export-details summary::-webkit-details-marker {
  display: none;
}

/* SF Symbols 风格的雪佛龙箭头 */
.export-details summary::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-right: 1.5px solid var(--text-tertiary);
  border-bottom: 1.5px solid var(--text-tertiary);
  transform: rotate(-45deg);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.export-details[open] summary::before {
  transform: rotate(45deg);
}

.export-details[open] summary {
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.export-settings-content {
  padding: var(--space-sm) var(--space-sm) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  animation: detailsSlideIn 0.2s ease;
}

@keyframes detailsSlideIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* === 固定底部导出栏 === */
.export-bar {
  flex-shrink: 0;
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
  display: flex;
  gap: var(--space-sm);
  align-items: stretch;
}

/* 自定义下拉菜单 */
.custom-select {
  position: relative;
  flex-shrink: 0;
}

.custom-select-trigger {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 10px;
  height: 36px;
  min-width: 72px;
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.custom-select-trigger:hover {
  border-color: var(--border-color-hover);
}

.custom-select.open .custom-select-trigger {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(10, 132, 255, 0.15);
}

.custom-select-arrow {
  color: var(--text-tertiary);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.custom-select.open .custom-select-arrow {
  transform: rotate(180deg);
}

.custom-select-menu {
  display: none;
  position: absolute;
  bottom: calc(100% + 6px);
  left: 0;
  min-width: 160px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  padding: 4px;
  list-style: none;
  z-index: 200;
  animation: menuSlideIn 0.15s ease;
}

[data-theme="light"] .custom-select-menu {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.custom-select.open .custom-select-menu {
  display: block;
}

@keyframes menuSlideIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.custom-select-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-primary);
  border-radius: calc(var(--radius-md) - 4px);
  cursor: pointer;
  transition: background var(--transition-fast);
  gap: var(--space-md);
}

.custom-select-full {
  width: 100%;
}

.custom-select-full .custom-select-trigger {
  width: 100%;
  justify-content: space-between;
}

.custom-select-full .custom-select-menu {
  width: 100%;
}

.custom-select-item:hover {
  background: var(--border-color);
}

.custom-select-item.selected {
  color: var(--accent-primary);
}

.item-desc {
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--text-tertiary);
  margin-left: auto;
}

.custom-select-item.selected .item-desc {
  color: var(--text-secondary);
}

/* 导出按钮 */
.btn-export {
  flex: 1;
  padding: 10px 16px;
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.btn-export:hover:not(:disabled) {
  filter: brightness(1.1);
}

.btn-export:active:not(:disabled) {
  filter: brightness(0.95);
  transform: scale(0.99);
}

.btn-export:disabled {
  background: var(--border-color);
  color: var(--text-tertiary);
  cursor: not-allowed;
}

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

/* === 右侧预览区域 === */
.preview-area {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  overflow: hidden;
  background: var(--bg-primary);
}

/* 空状态 */
.empty-state {
  display: flex; /* 不必担心，因为加上了 [hidden] { display: none !important; } */
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  color: var(--text-secondary);
  text-align: center;
}

.empty-icon {
  width: 64px;
  height: 64px;
  opacity: 0.4;
  margin-bottom: var(--space-sm);
}

.empty-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.empty-hint {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* 预览容器 */
.preview-container {
  max-width: 100%;
  max-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.preview-container canvas {
  max-width: 100%;
  max-height: calc(100vh - var(--header-height) - var(--footer-height) - var(--space-xl) * 2);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  /* 棋盘格背景，表示透明区域 */
  background-image:
    linear-gradient(45deg, var(--bg-secondary) 25%, transparent 25%),
    linear-gradient(-45deg, var(--bg-secondary) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--bg-secondary) 75%),
    linear-gradient(-45deg, transparent 75%, var(--bg-secondary) 75%);
  background-size: 16px 16px;
  background-color: var(--bg-primary);
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}



/* === 响应式布局 === */
@media (max-width: 768px) {
  :root {
    --panel-width: 100%;
    --header-height: 48px;
    --footer-height: 40px;
  }

  .main-content {
    flex-direction: column;
    overflow-y: auto;
  }

  .control-panel {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    max-height: none;
  }

  .panel-scroll {
    overflow-y: visible;
  }

  .export-bar {
    position: sticky;
    bottom: 0;
    z-index: 50;
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
  }


  .preview-area {
    min-height: 40vh;
    padding: var(--space-lg);
  }

  .preview-container canvas {
    max-height: 50vh;
  }

  .header {
    padding: 0 var(--space-lg);
  }

  .empty-state {
    padding: var(--space-xl);
  }

  .empty-icon {
    width: 48px;
    height: 48px;
  }

  .empty-title {
    font-size: 0.9rem;
  }

  .empty-hint {
    font-size: 0.8rem;
  }

  .footer-content span {
    font-size: 0.68rem;
  }
}

@media (max-width: 480px) {
  .template-chips {
    gap: var(--space-xs);
  }

  .chip {
    padding: 3px 8px;
    font-size: 0.7rem;
  }

  .color-presets {
    gap: var(--space-xs);
  }

  .color-preset {
    width: 20px;
    height: 20px;
  }

  .format-segmented {
    font-size: 0.72rem;
  }

  .export-format-select {
    font-size: 0.75rem;
    padding-left: 8px;
    padding-right: 22px;
  }

  .custom-select-trigger {
    font-size: 0.75rem;
    min-width: 60px;
    padding: 0 8px;
  }

  .format-option span {
    padding: 4px 6px;
    font-size: 0.72rem;
  }

  .btn-export {
    font-size: 0.82rem;
    padding: 9px 12px;
  }
}

/* === 全页面拖拽覆盖层 === */
.global-drop-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

[data-theme="light"] .global-drop-overlay {
  background: rgba(255, 255, 255, 0.6);
}

.global-drop-overlay.active {
  opacity: 1;
}

.global-drop-overlay-content {
  padding: var(--space-xl) var(--space-2xl);
  background: var(--bg-elevated);
  border-radius: var(--radius-xl);
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.global-drop-overlay-content p {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* === 关于弹窗（模态框） === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  animation: modalFadeIn 0.2s ease;
}

[data-theme="light"] .modal-overlay {
  background: rgba(0, 0, 0, 0.3);
}

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

.modal-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  width: 340px;
  max-width: 90vw;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  animation: modalSlideIn 0.25s ease;
  overflow: hidden;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-header {
  text-align: center;
  padding: var(--space-xl) var(--space-xl) var(--space-md);
}

.modal-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  margin-bottom: var(--space-md);
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  margin-bottom: 2px;
}

.modal-subtitle {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.modal-version {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--text-tertiary);
  background: var(--border-color);
  padding: 2px 8px;
  border-radius: 10px;
}

.modal-body {
  padding: 0 var(--space-xl) var(--space-lg);
}

.modal-body > p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
  text-align: center;
  margin-bottom: var(--space-md);
}

.modal-features {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  background: var(--bg-input);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.modal-feature {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.78rem;
  color: var(--text-primary);
}

.modal-feature svg {
  color: var(--accent-primary);
  flex-shrink: 0;
}

.modal-footer {
  padding: 0 var(--space-xl) var(--space-xl);
}

.modal-close-btn {
  width: 100%;
  padding: 10px;
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  filter: brightness(1.1);
}

.modal-close-btn:active {
  filter: brightness(0.95);
  transform: scale(0.99);
}

/* === SEO 语义内容区域 === */
/* 该区域包含面向搜索引擎的文本内容，视觉上通过折叠隐藏不影响应用UI */
.seo-content {
  height: 0;
  overflow: hidden;
  position: absolute;
  left: -9999px;
  /* 以下属性确保爬虫能正常解析该区域 */
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
}

.seo-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-xl);
}

.seo-content h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: var(--space-lg) 0 var(--space-sm);
}

.seo-content p {
  margin-bottom: var(--space-sm);
}

.seo-content ul {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
}

.seo-content li {
  margin-bottom: var(--space-xs);
}

.seo-content details {
  margin-bottom: var(--space-sm);
}

.seo-content summary {
  font-weight: 500;
  cursor: pointer;
}

.seo-copyright {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: var(--space-lg);
  text-align: center;
}