@import url('https://fonts.googleapis.com/css2?family=Knewave&family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,600;0,700;1,100;1,200;1,300;1,400;1,500&display=swap');

/* Chỉ reset tối thiểu cho nút back */
.back {
    font-family: "Poppins", sans-serif;
    position: fixed;
    top: 20px;
    left: 20px;

    padding: 1.3em 3em;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 2.5px;
    font-weight: 500;

    color: #000;
    background-color: #fff;

    border-radius: 45px;
    box-shadow: 0px 8px 15px rgba(0, 0, 0, 0.1);

    text-decoration: none;
    cursor: pointer;
    outline: none;
    border: none;

    display: inline-block;
    transition: all 0.3s ease;
    z-index: 999;
}

/* Hover effect */
.back:hover {
    background-color: #23c483;
    box-shadow: 0px 15px 20px rgba(46, 229, 157, 0.4);
    color: #fff;
    transform: translateY(-7px);
}

/* Active */
.back:active {
    transform: translateY(-1px);
}

/* Responsive */
@media (max-width: 600px) {
    .back {
        padding: 1em 2em;
        font-size: 12px;
    }
}