body {
    text-align: center;
    background: linear-gradient(135deg, #1a1a1a 0%, #0a0a0a 100%);
    color: #f5f5f5;
    font-family: 'Poppins', 'Segoe UI', 'Arial', sans-serif;
    font-size: 2rem;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

h1 {
    font-size: 3.5rem;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: #fff;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
    animation: fadeInDown 0.8s ease-out;
}

h2 {
    font-size: 1.5rem;
    font-weight: 400;
    color: #b8b8b8;
    margin-bottom: 2rem;
    letter-spacing: 1px;
    animation: fadeIn 1s ease-out;
}

.btn-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    max-width: 800px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    animation: fadeInUp 1s cubic-bezier(0.4, 0, 0.2, 1);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn {
    height: 50px;
    width: 50px;
    border-radius: 25px;
    border: none;
    margin: 1rem;
    position: relative;
    overflow: hidden;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
                background-color 0.2s ease-in-out,
                transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    cursor: pointer;
    will-change: transform, box-shadow, background-color;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0) 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.btn:hover::before {
    opacity: 1;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

.pink {
    background: linear-gradient(145deg, rgb(222, 91, 127), rgb(212, 81, 117));
}

.green {
    background: linear-gradient(145deg, rgb(99, 170, 194), rgb(89, 160, 184));
}

.orange {
    background: linear-gradient(145deg, rgb(255, 154, 69), rgb(250, 144, 59));
}

.blue {
    background: linear-gradient(145deg, rgb(129, 158, 255), rgb(119, 148, 248));
}

.flash {
    background: white !important;
    transform: scale(1.05) !important;
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.5) !important;
    transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
}

.userFlash {
    background: #2ecc71 !important;
    transform: scale(0.95) !important;
    transition: all 0.15s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
}

.btn:active {
    transform: scale(0.95) translateY(0);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    transition: all 0.1s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@media (min-width: 768px) {
    .btn {
        height: 200px;
        width: 200px;
    }
}

@media (min-width: 1024px) {
    .btn {
        height: 250px;
        width: 250px;
    }
}

@media (min-width: 1200px) {
    .btn {
        height: 300px;
        width: 300px;
    }
}

@media (max-width: 767px) {
    body {
        font-size: 1.5rem;
    }
    
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 1.2rem;
    }

    .btn {
        height: 120px;
        width: 120px;
        margin: 0.8rem;
    }
}