.main-header {
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.85) 0%, rgba(0, 0, 0, 0) 100%);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 30px 0;
    font-family: 'Montserrat', sans-serif;
    transition: background-color 0.3s ease;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-logo {
    font-size: 2rem;
    font-weight: 700;
    text-decoration: none;
    color: #ffffff;
    display: flex;
    align-items: center;
    letter-spacing: -1px;
}

.header-logo sup {
    color: #ffffff;
    font-size: 1.2rem;
    top: -0.5em;
    margin-right: 2px;
}

.header-nav>ul {
    list-style: none;
    display: flex;
    gap: 40px;
    margin: 0;
    padding: 0;
}

.header-nav>ul>li>a {
    text-decoration: none;
    color: #4be2ff;
    /* Vibrant cyan from screenshot */
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 1.5px;
    transition: color 0.3s ease;
    text-transform: uppercase;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
    /* Shadow for depth */
    white-space: nowrap;
    display: flex;
    align-items: center;
}

.header-nav ul li a:hover {
    color: #ffffff;
}

.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    color: #ffffff;
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 1100;
}

/* Dropdown Menu Styling */
.has-dropdown {
    position: relative;
}

.dropdown-caret {
    font-size: 0.7em;
    margin-left: 6px;
    vertical-align: middle;
    opacity: 0.8;
    transition: transform 0.3s ease;
    display: inline-block;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #000000;
    min-width: 320px;
    padding: 15px 0;
    list-style: none;
    display: none;
    /* Hidden by default */
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border-top: 2px solid #4be2ff;
    z-index: 1001;
}

/* Visibility Rules */
@media (hover: hover) {
    .has-dropdown:hover>.dropdown-menu {
        display: flex;
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .has-dropdown:hover>a .dropdown-caret {
        transform: rotate(180deg);
    }
}

.has-dropdown.active>.dropdown-menu {
    display: flex !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
}

.has-dropdown.active>a .dropdown-caret {
    transform: rotate(180deg) !important;
}

.dropdown-menu li {
    padding: 0 !important;
    margin: 0 !important;
}

.dropdown-menu li:not(:last-child) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.dropdown-menu li a {
    padding: 15px 25px !important;
    color: #4be2ff !important;
    font-size: 0.9rem !important;
    font-weight: 500 !important;
    text-transform: none !important;
    letter-spacing: 0.5px !important;
    display: block !important;
    width: 100% !important;
    transition: background 0.2s ease, color 0.2s ease !important;
    text-shadow: none !important;
}

.dropdown-menu li a:hover {
    background: rgba(75, 226, 255, 0.05);
    color: #ffffff !important;
}

@media (max-width: 768px) {
    .header-container {
        flex-direction: row;
        /* Keep logo and hamburger in line */
        justify-content: space-between;
        padding: 15px 30px;
    }

    .header-logo {
        font-size: 1.6rem;
    }

    .mobile-nav-toggle {
        display: block;
        /* Show on mobile */
    }

    .header-nav {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: #000000;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        opacity: 0;
        visibility: hidden;
        transition: all 0.4s ease;
        z-index: 1050;
    }

    .header-nav.nav-open {
        opacity: 1;
        visibility: visible;
    }

    .header-nav>ul {
        flex-direction: column;
        gap: 25px;
        align-items: center;
        width: 100%;
    }

    .header-nav>ul>li {
        width: 100%;
        text-align: center;
    }

    .header-nav>ul>li>a {
        font-size: 1.3rem;
        letter-spacing: 2px;
        display: block;
        padding: 15px 0;
    }

    /* Mobile Dropdown Styling within Hamburger */
    .header-nav .dropdown-menu {
        display: none !important;
        position: static !important;
        opacity: 1 !important;
        visibility: visible !important;
        transform: none !important;
        min-width: 100% !important;
        box-shadow: none !important;
        border: none !important;
        background: rgba(255, 255, 255, 0.03) !important;
        padding: 0 !important;
    }

    .header-nav .has-dropdown.active>.dropdown-menu {
        display: flex !important;
        padding: 10px 0 !important;
    }

    .dropdown-menu li a {
        padding: 12px 0 !important;
        text-align: center;
        font-size: 1rem !important;
    }
}