/* AI Today - nút chuyển chế độ sáng/tối (token màu ở aitoday.css) */
html[data-theme="dark"] { color-scheme: dark; }
html[data-theme="light"] { color-scheme: light; }
.theme-toggle { display: inline-flex; align-items: center; justify-content: center; padding: 0; cursor: pointer; transition: color .15s, border-color .15s; }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .ic-sun { display: none; }
html[data-theme="dark"] .theme-toggle .ic-sun { display: block; }
html[data-theme="dark"] .theme-toggle .ic-moon { display: none; }