body{
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden; /* ← CRITICAL: Prevents body scroll */
    font-family: var(--io-font-primary);
    background: var(--io-surface-base);
    color: var(--io-font-primary);
}

*{
    box-sizing: border-box;
}

#app {
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#app-content {
    flex: 1;
    overflow: hidden;
    background: var(--io-surface-base);
}

.titlebar {
    height: 40px;
    background: var(--io-surface-raised);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    flex-shrink: 0; /* ← Don't compress in flex layout */
    -webkit-app-region: drag;
    user-select: none !important;
}