body {
    background: #0f0c29;
    background: linear-gradient(135deg, #485563, #29323c);
    color: #fff;
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
}
.container {
    margin: 40px auto;
    background: rgba(35,35,51,0.85);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.18);
    padding: 36px 24px 32px 24px;
    width: 420px;
    text-align: center;
}
h1 {
    margin-top: 0;
    letter-spacing: 2px;
}
#gameCanvas {
    background-color: #18243a;
    border: 2px solid #3d6978;
    border-radius: 6px;
    margin: 15px 0 8px;
}
#score {
    font-size: 1.25em;
    margin: 14px 0;
    font-weight: 500;
    color: #ffeb3b;
}
#restartBtn {
    font-size: 1em;
    background: #40c057;
    border: none;
    border-radius: 4px;
    color: #222;
    padding: 8px 16px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.2s;
}
#restartBtn:hover {
    background: #37b24d;
}
@media (max-width: 500px) {
    .container {
        width: 98vw;
        padding: 10px 0 14px 0;
    }
    #gameCanvas {
        width: 95vw !important;
        height: 95vw !important;
        max-width: 390px;
        max-height: 390px;
    }
}