body { transition: background-color 0.3s, color 0.3s; }
.tab-content { display: none; }
.tab-content.active { display: block; }
.modal { display: none; }
.modal.active { display: flex; }
.scrollbar-none::-webkit-scrollbar { display: none; }
.loader { border-top-color: #3b82f6; animation: spinner 1.5s linear infinite; }
@keyframes spinner { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }