body[data-theme="xmas"] .stage { background: radial-gradient(120% 80% at 50% 110%, #3b0d14 0%, #120a10 45%, #05070b 100%); }
body[data-theme="xmas"] .gradient-text.xmas { background: linear-gradient(135deg, #f87171, #fbbf24); -webkit-background-clip: text; background-clip: text; color: transparent; }
body[data-theme="xmas"] .gt-btn:not(.ghost) { background: linear-gradient(135deg, #ef4444, #f59e0b); box-shadow: 0 0.5em 1.6em rgba(239, 68, 68, 0.4), inset 0 -0.2em 0 rgba(0, 0, 0, 0.18); }