/* 主题过渡 */
*,
*::before,
*::after {
  transition: background-color 0.3s ease, 
              border-color 0.3s ease, 
              box-shadow 0.3s ease,
              color 0.2s ease;
}

/* 主题变量 */
:root {
  /* 深色主题（默认） */
  --bg-primary: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  --bg-secondary: rgba(255, 255, 255, 0.05);
  --bg-tertiary: rgba(255, 255, 255, 0.08);
  --bg-input: rgba(255, 255, 255, 0.06);
  --bg-hover: rgba(255, 255, 255, 0.12);
  --bg-header: rgba(0, 0, 0, 0.25);

  --border-primary: rgba(255, 255, 255, 0.1);
  --border-secondary: rgba(255, 255, 255, 0.15);
  --border-focus: rgba(102, 126, 234, 0.5);

  --text-primary: #e0e0e0;
  --text-secondary: #aaa;
  --text-muted: #666;
  --text-dim: #555;

  --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --accent-primary: #667eea;
  --accent-secondary: #764ba2;

  --scrollbar-track: rgba(255, 255, 255, 0.03);
  --scrollbar-thumb: rgba(255, 255, 255, 0.15);
  --scrollbar-hover: rgba(255, 255, 255, 0.25);

  --shadow-card: 0 20px 40px rgba(0, 0, 0, 0.3);
  --shadow-accent: 0 4px 15px rgba(102, 126, 234, 0.3);

  --card-bg: rgba(255, 255, 255, 0.06);
  --card-border: rgba(255, 255, 255, 0.1);
  --input-bg: rgba(255, 255, 255, 0.06);
  --input-border: rgba(255, 255, 255, 0.1);
  --tag-bg: rgba(255, 255, 255, 0.06);
  --tag-bg-hover: rgba(255, 255, 255, 0.12);
}

/* 浅色主题 */
[data-theme="light"] {
  --bg-primary: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
  --bg-secondary: rgba(0, 0, 0, 0.03);
  --bg-tertiary: rgba(0, 0, 0, 0.05);
  --bg-input: rgba(0, 0, 0, 0.04);
  --bg-hover: rgba(0, 0, 0, 0.08);
  --bg-header: rgba(255, 255, 255, 0.8);

  --border-primary: rgba(0, 0, 0, 0.1);
  --border-secondary: rgba(0, 0, 0, 0.15);
  --border-focus: rgba(102, 126, 234, 0.5);

  --text-primary: #1a1a2e;
  --text-secondary: #555;
  --text-muted: #888;
  --text-dim: #aaa;

  --scrollbar-track: rgba(0, 0, 0, 0.03);
  --scrollbar-thumb: rgba(0, 0, 0, 0.15);
  --scrollbar-hover: rgba(0, 0, 0, 0.25);

  --shadow-card: 0 20px 40px rgba(0, 0, 0, 0.1);
  --shadow-accent: 0 4px 15px rgba(102, 126, 234, 0.2);

  --card-bg: #ffffff;
  --card-border: rgba(0, 0, 0, 0.06);
  --input-bg: #ffffff;
  --input-border: rgba(0, 0, 0, 0.08);
  --tag-bg: #ffffff;
  --tag-bg-hover: #f8f9ff;
}

/* 主题切换按钮 */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  z-index: 1000;
}

.theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  transform: scale(1.05);
}

.theme-toggle svg {
  width: 22px;
  height: 22px;
  transition: transform 0.3s ease;
}

.theme-toggle:hover svg {
  transform: rotate(15deg);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute;
  transition: opacity 0.3s, transform 0.3s;
}

.theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(-90deg);
}

.theme-toggle .icon-moon {
  opacity: 1;
  transform: rotate(0deg);
}

[data-theme="light"] .theme-toggle .icon-sun {
  opacity: 1;
  transform: rotate(0deg);
}

[data-theme="light"] .theme-toggle .icon-moon {
  opacity: 0;
  transform: rotate(90deg);
}

/* 浅色主题下的统计徽章 */
[data-theme="light"] .stat-badge.deleted {
  background: rgba(239, 68, 68, 0.15);
  color: #dc2626;
}

[data-theme="light"] .stat-badge.added {
  background: rgba(34, 197, 94, 0.15);
  color: #16a34a;
}

[data-theme="light"] .stat-badge.modified {
  background: rgba(234, 179, 8, 0.15);
  color: #ca8a04;
}

[data-theme="light"] .stat-badge.time {
  background: rgba(99, 102, 241, 0.15);
  color: #4f46e5;
}

/* 返回首页按钮（工具栏内） */
.home-btn-inline {
  text-decoration: none;
}

.home-btn-inline:hover {
  text-decoration: none;
}