/* Header & Navigation */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    z-index: 1000;
    transition: background 0.3s ease;

    /* Glassmorphism */
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 50px;
    /* Adjust based on nav height */
    width: auto;
    object-fit: contain;
}

/* Desktop Nav */
.main-nav ul {
    display: flex;
    gap: var(--spacing-lg);
}

.main-nav a {
    position: relative;
    font-weight: 500;
    transition: color 0.3s ease;
}

.main-nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
}

.main-nav a:hover {
    color: var(--accent-color);
}

.main-nav a:hover::after {
    width: 100%;
}

/* Submenu */
.has-submenu {
    position: relative;
}

.submenu {
    position: absolute;
    top: 100%;
    left: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    flex-direction: column !important;
    gap: 0 !important;
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    padding: var(--spacing-sm) 0;
    border-radius: 4px;
}

.has-submenu:hover .submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.submenu li a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    white-space: nowrap;
}

.submenu li a:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* Burger Menu (Hidden on Desktop) */
.burger-menu {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

/* Mobile Styles */
@media (max-width: 768px) {
    .burger-menu {
        display: block;
        position: relative;
        width: 30px;
        height: 20px;
    }

    .burger-menu::before,
    .burger-menu::after,
    .burger-menu span {
        content: '';
        position: absolute;
        left: 0;
        width: 100%;
        height: 2px;
        background: var(--text-color);
        transition: all 0.3s ease;
    }

    .burger-menu::before {
        top: 0;
    }

    .burger-menu span {
        top: 9px;
    }

    .burger-menu::after {
        bottom: 0;
    }

    /* Burger Animation State */
    .burger-menu.active::before {
        transform: rotate(45deg);
        top: 9px;
    }

    .burger-menu.active span {
        opacity: 0;
    }

    .burger-menu.active::after {
        transform: rotate(-45deg);
        bottom: 9px;
    }


    .main-nav {
        position: fixed;
        top: 0;
        left: 0;
        /* Full screen overlay */
        width: 100%;
        height: 100vh;
        background: rgba(5, 5, 5, 0.95);
        /* Deep dark background */
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        padding-top: 0;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        z-index: 999;
        /* Behind burger */
    }

    .main-nav.active {
        opacity: 1;
        visibility: visible;
        pointer-events: all;
    }

    .main-nav ul {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-xl);
    }

    .main-nav li {
        opacity: 0;
        transform: translateY(20px);
        transition: all 0.4s ease;
    }

    /* Staggered Animation */
    .main-nav.active li:nth-child(1) {
        transition-delay: 0.1s;
    }

    .main-nav.active li:nth-child(2) {
        transition-delay: 0.2s;
    }

    .main-nav.active li:nth-child(3) {
        transition-delay: 0.3s;
    }

    .main-nav.active li:nth-child(4) {
        transition-delay: 0.4s;
    }

    .main-nav.active li {
        opacity: 1;
        transform: translateY(0);
    }

    .main-nav a {
        font-size: 2rem;
        /* Larger font */
        font-weight: 300;
        text-transform: uppercase;
        letter-spacing: 2px;
        color: rgba(255, 255, 255, 0.8);
    }

    .main-nav a:hover {
        color: var(--accent-color);
        transform: scale(1.1);
        display: inline-block;
    }

    .main-nav a::after {
        display: none;
        /* No underline on mobile, scale instead */
    }

    .has-submenu:hover .submenu {
        display: flex;
        position: static;
        background: rgba(255, 255, 255, 0.05);
        width: 100%;
        margin-top: 10px;
        opacity: 1;
        visibility: visible;
        transform: none;
        border: none;
    }

    .submenu li a {
        font-size: 1.2rem;
        padding: 10px;
    }
}