body {
    text-align: center;
    font-family: 'Segoe UI', Tahoma, sans-serif;
    margin: 0;
    padding: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #89f7fe, #66a6ff);
    transition: background-color 0.5s ease;
    user-select: none;
}

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

button {
    padding: 12px 28px;
    font-size: 18px;
    font-weight: bold;
    color: white;
    background: linear-gradient(90deg, #ff6a00, #ee0979);
    border: none;
    border-radius: 30px;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    user-select: none;
}

button:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0,0,0,0.4);
    user-select: none;
}

button:active {
    transform: scale(0.95);
    user-select: none;
}

.controls {
    margin-top: 20px;
    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;
}