body {
    margin: 0;
    height: 100vh;
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #ff9a9e, #fad0c4);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    color: white;
    user-select: none;
}

h1 {
    margin-top: 20px;
    text-shadow: 2px 2px 6px rgba(0,0,0,0.3);
    user-select: none;
}

#score, #timer {
    font-size: 20px;
    background: rgba(0,0,0,0.3);
    padding: 8px 16px;
    border-radius: 20px;
    margin: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    user-select: none;
}

#circle {
    position: absolute;
    width: 70px;
    height: 70px;
    background: radial-gradient(circle, #ff6a00, #ee0979);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(255, 105, 180, 0.8);
    animation: pulse 1s infinite;
    transition: transform 0.1s ease;user-select: none;
}

#circle:hover {
    transform: scale(1.1);
    user-select: none;
}

@keyframes pulse {
    0% { box-shadow: 0 0 15px rgba(255, 105, 180, 0.8); }
    50% { box-shadow: 0 0 30px rgba(255, 105, 180, 1); }
    100% { box-shadow: 0 0 15px rgba(255, 105, 180, 0.8); }
}

.controls {
    margin-top: 20px;
    z-index: 10;
    user-select: none;
}

.back-btn {
    display: inline-block;
    text-decoration: none;
    padding: 10px 18px;
    border-radius: 10px;
    background: rgba(255,255,255,0.9);
    color: #3a3a3a;
    box-shadow: 0 6px 18px rgba(0,0,0,0.15);
    font-weight: bold;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    user-select: none;
}

.back-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 24px rgba(0,0,0,0.18);
    user-select: none;
}