/* HAMBURGER MENU — Tablet & Mobile Only */

/* Hidden on desktop */
.hamburger-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 17px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
}

.hamburger-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: #000;
    border-radius: 1px;
    transform-origin: center;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Three lines → X */
.hamburger-btn.is-active span:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}
.hamburger-btn.is-active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.hamburger-btn.is-active span:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* TABLET & MOBILE (≤ 1024px) */
@media (max-width: 1024px) {

    /* Show hamburger */
    .hamburger-btn {
        display: flex;
        position: relative;
        z-index: 1002;
    }

    /* Header: logo left, hamburger right */
    header {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 0;
        position: relative;
        z-index: 1002;
    }

    /* Nav dropdown — hidden by default */
    header nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #ffffff;
        z-index: 1000;
        padding: 0 40px 15px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    }

    /* Nav dropdown — open state */
    header nav.nav-open {
        display: block;
    }

    /* Nav list */
    header nav ul {
        display: flex;
        flex-direction: column;
        gap: 0;
        list-style: none;
        padding: 0;
        margin: 0;
    }

    /* Nav links */
    header nav ul li a {
        display: block;
        position: relative;
        padding: 20px 0;
        font-size: 18px;
        font-weight: 600;
        color: #000;
        text-decoration: none;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        line-height: 1;
        transition: color 0.25s ease;
    }

    /* Reset visited link colour */
    header nav ul li a:visited {
        color: #000;
        text-decoration: none;
    }

    /* Animated underline — starts at 0, grows left to right on hover */
    header nav ul li a::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 0;
        height: 2px;
        background: #5c83e6;
        transition: width 0.3s ease;
    }

    /* Hover only */
    header nav ul li a:hover {
        color: #5c83e6;
    }

    header nav ul li a:hover::after {
        width: 100%;
    }
}

/* MOBILE (≤ 480px) */
@media (max-width: 480px) {

    header nav {
        padding: 0 25px 10px;
    }

    header nav ul li a {
        font-size: 16px;
        padding: 18px 0;
    }
}