body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

.tab-content { display: none; }
.tab-content.active { display: block; }

.phase-content { display: none; }
.phase-content.active { display: block; }

#sidebar-nav .nav-btn.active {
    background-color: rgba(59, 130, 246, 0.15);
    color: #3b82f6;
    font-weight: 700;
}