/* ============================================
   主题切换 Switch 组件（固定在右上角）
   浅色 / 暗黑模式切换
   ============================================ */

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-full);
  padding: 5px 10px;
  cursor: pointer;
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast),
              background var(--transition-base);
  -webkit-tap-highlight-color: transparent;
}

.theme-toggle:hover {
  border-color: var(--accent-purple);
  box-shadow: var(--shadow-glow);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

/* === 图标（太阳 / 月亮）=== */
.theme-toggle__icon {
  font-size: 14px;
  line-height: 1;
  transition: opacity var(--transition-base), transform var(--transition-base);
  user-select: none;
}

.theme-toggle__icon--sun {
  opacity: 1;
  transform: scale(1);
}

.theme-toggle__icon--moon {
  opacity: 0.45;
  transform: scale(0.85);
}

/* 暗黑模式下：月亮高亮、太阳淡出 */
[data-theme="dark"] .theme-toggle__icon--sun {
  opacity: 0.45;
  transform: scale(0.85);
}

[data-theme="dark"] .theme-toggle__icon--moon {
  opacity: 1;
  transform: scale(1);
}

/* === 滑动轨道 === */
.theme-toggle__track {
  position: relative;
  width: 44px;
  height: 24px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.25);
  transition: background var(--transition-base);
  flex-shrink: 0;
}

/* === 滑块 === */
.theme-toggle__thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  transition: transform var(--transition-base), background var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 浅色模式：滑块在左侧（太阳侧） */
.theme-toggle__thumb {
  transform: translateX(0);
}

/* 暗黑模式：滑块滑动到右侧（月亮侧） */
[data-theme="dark"] .theme-toggle__thumb {
  transform: translateX(20px);
  background: #1a2233;
}

/* 滑块上的小图标（随主题变化） */
.theme-toggle__thumb::after {
  content: '☀';
  font-size: 11px;
  line-height: 1;
  color: var(--accent-yellow);
  transition: opacity var(--transition-fast);
}

[data-theme="dark"] .theme-toggle__thumb::after {
  content: '☾';
  color: var(--accent-cyan);
}

/* === 移动端适配 === */
@media (max-width: 640px) {
  .theme-toggle {
    padding: 4px 8px;
    gap: var(--space-xs);
  }

  .theme-toggle__track {
    width: 38px;
    height: 22px;
  }

  .theme-toggle__thumb {
    width: 16px;
    height: 16px;
  }

  [data-theme="dark"] .theme-toggle__thumb {
    transform: translateX(16px);
  }

  /* 移动端隐藏文字标签，仅保留图标+轨道以节省空间 */
  .theme-toggle__label {
    display: none;
  }
}

/* === 全局主题过渡（切换瞬间启用，避免影响 hover 动画）=== */
html.theme-transition,
html.theme-transition *,
html.theme-transition *::before,
html.theme-transition *::after {
  transition: background-color 0.4s ease,
              border-color 0.4s ease,
              color 0.4s ease,
              fill 0.4s ease,
              stroke 0.4s ease,
              box-shadow 0.4s ease !important;
}