.screen { display: none; width: 100%; min-height: 100vh; }
.screen.active { display: block; }

.topbar {
    position: sticky; top: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    height: 60px; padding: 0 28px;
    background: var(--bg-topbar);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 1px 24px rgba(0, 0, 0, 0.25);
}
.topbar-left { display: flex; align-items: center; gap: 10px; }
.topbar-center { flex: 1; max-width: 440px; margin: 0 24px; }
.topbar-right { display: flex; align-items: center; gap: 8px; }
.topbar-title { font-size: 1rem; font-weight: 600; letter-spacing: .5px; }

.logo-small {
    width: 32px; height: 32px; border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--accent), var(--purple));
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 14px; color: #fff;
    box-shadow: 0 0 16px var(--accent-glow);
}

.system-bar {
    display: flex; gap: 14px; padding: 22px 28px 10px;
    overflow-x: auto; scrollbar-width: none;
}
.system-bar::-webkit-scrollbar { display: none; }

.services-wrap {
    padding: 14px 28px 48px;
}

.category-group { margin-bottom: 42px; }
.category-title {
    font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 2px; color: var(--text-muted);
    margin-bottom: 18px; padding-left: 16px;
    position: relative;
}
.category-title::before {
    content: '';
    position: absolute; left: 0; top: 50%; transform: translateY(-50%);
    width: 3px; height: 14px; border-radius: 2px;
    background: var(--cat-color, var(--accent));
}
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 14px;
}

@media (max-width: 768px) {
    .topbar { padding: 0 14px; height: 56px; }
    .topbar-center { max-width: none; margin: 0 8px; }
    .system-bar { padding: 14px; gap: 10px; }
    .services-wrap { padding: 8px 14px 24px; }
    .services-grid { grid-template-columns: 1fr; }
    .category-group { margin-bottom: 28px; }
}