body {
    background-color: #0f172a;
    color: white;
    font-family: 'Segoe UI', system-ui, sans-serif;
    margin: 0;
    overflow: hidden;
    overscroll-behavior: none;
    touch-action: none;
    -webkit-overflow-scrolling: touch;
    user-select: none;
}

#app {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100dvh;
    display: flex;
    flex-direction: column;
}

.top-bar {
    height: 50px;
    background: #1e293b;
    border-bottom: 1px solid #334155;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 15px;
    z-index: 50;
    flex-shrink: 0;
}

.canvas-area {
    flex-grow: 1;
    position: relative;
    background: #0f172a;
    overflow: hidden;
    touch-action: none;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: default;
    touch-action: none;
}
canvas.interactive { cursor: pointer; }