.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: 18px;
    font-weight: bold;
    text-align: center;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: 8px;
    background: #d32f2f;
    color: white;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease-in-out;
}

.btn::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 300%;
    height: 300%;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transform-origin: center;
    z-index: 0;
}

.btn:hover {
    background: #ff5722;
    box-shadow: 0 0 15px rgba(255, 87, 34, 0.7), 0 0 40px rgba(255, 87, 34, 0.5);
}

.btn:hover::before {
    width: 0;
    height: 0;
    opacity: 0;
}

.btn:active {
    transform: scale(0.98);
}

.btn:focus {
    outline: none;
}

a.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: 18px;
    font-weight: bold;
    text-align: center;
    text-decoration: none;
    border-radius: 8px;
    background: #d32f2f;
    color: white;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease-in-out;
}