/* Dark Mode 支持 */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --border-color: #e5e7eb;
  --shadow-color: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --text-primary: #e2e8f0;
  --text-secondary: #cbd5e1;
  --border-color: rgba(148, 163, 184, 0.2);
  --shadow-color: rgba(0, 0, 0, 0.3);
}

/* 应用颜色变量 */
body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s, color 0.3s;
}

/* Dark Mode 切换按钮 */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
  z-index: 100;
}

.theme-toggle:hover {
  box-shadow: 0 4px 6px var(--shadow-color);
  transform: scale(1.1);
}

/* 图像调整 (深色模式) */
[data-theme="dark"] img {
  opacity: 0.9;
}