.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 5%;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.fg-lab-banner {
    height: 90px;
    width: auto;
}

.header-button-div {
    display: flex;
}

.header-button {
    position: relative;
    color: white;
    text-decoration: none;
    padding: 6px 6px;
    margin-left: 22px;
    border-radius: 5px;
    transition: color 0.3s ease;
}

.header-button::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    height: 2px;
    width: 100%;
    background-color: #2bff87;
    transform: scaleX(0);
    transform-origin: right; /* default: animate from left to right */
    transition: transform 0.3s ease, transform-origin 0s;
}

.header-button:hover {
    color: #2bff87;
}

.header-button:hover::after {
    transform: scaleX(1);
    transform-origin: left; /* keep origin fixed for consistent direction */
}



/* Hamburger mobile menu */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    z-index: 110;
}

.hamburger span {
    height: 3px;
    width: 30px;
    background: white;
    margin: 4px 0;
    transition: 0.3s;
}

/* Hamburger "X" transformation */
.hamburger.open span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}
.hamburger.open span:nth-child(2) {
    opacity: 0;
}
.hamburger.open span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}

/* Slide-in menu */
.mobile-menu {
    position: fixed;
    top: 100px; /* same as header height */
    right: -100%;
    width: 100%;
    height: calc(100vh - 10px);
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: start;
    transition: right 0.3s ease;
    z-index: 120;
}

.mobile-menu a {
    margin: 15px 0;
    font-size: 24px;
}

/* Open state */
.mobile-menu.open {
    right: 0;
}



/* Responsive rules */
@media (max-width: 1024px) {
    .header {
        padding: 8px 2%;
    }
    .fg-lab-logo {
        height: 70px;
        width: auto;
    }
}

@media (max-width: 768px) {
    .header-button-div {
        display: none;
    }

    .hamburger {
        display: flex;
    }
}