* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    overflow: hidden;
    background: linear-gradient(160deg, #1d3557 0%, #457b9d 60%, #70c5ce 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: "Segoe UI", system-ui, sans-serif;
    user-select: none;
}

canvas {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
    cursor: pointer;
    touch-action: manipulation;
    /* Keep crisp on high-DPI screens */
    image-rendering: crisp-edges;
}