#menu-toggle {
    display: none;
}

.hamburger-menu {
    display: none;
}

.menu-btn {
    display: none;
    position: fixed;
    top: 30px;
    right: 20px;
    width: 50px;
    height: 50px;
    cursor: pointer;
    z-index: 1000;
}

.menu-btn span,
.menu-btn span:before,
.menu-btn span:after {
    content: '';
    display: block;
    width: 100%;
    height: 4px;
    background: #fff;
    position: absolute;
    transition: all 0.3s ease;
}

.menu-btn span {
    top: 50%;
    transform: translateY(-50%);
}

.menu-btn span:before {
    top: -10px;
}

.menu-btn span:after {
    bottom: -10px;
}

#menu-toggle:checked + .menu-btn span {
    background-color: transparent;
}

#menu-toggle:checked + .menu-btn span:before {
    transform: rotate(45deg);
    top: 0;
}

#menu-toggle:checked + .menu-btn span:after {
    transform: rotate(-45deg);
    bottom: 0;
}

.menu-box {
    display: none;
    position: fixed;
    top: 70px;
    right: 0;
    width: 200px;
    max-height: calc(100vh - 70px);
    overflow-y: auto;
    background: #555;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    z-index: 999;
    text-align: right;
    padding-right: 20px;
}

#menu-toggle:checked ~ .menu-box {
    display: block;
}

.menu-box li {
    display: block;
    padding: 10px 20px;
}

@media (min-width: 0) {
    .hamburger-menu {
        display: block;
    }

    .menu-btn {
        display: block;
    }

    header nav {
        display: none;
    }
}