/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2.5rem;
    background-color: var(--white);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 50;
    transition: background-color var(--transition), border-color var(--transition);
}

/* Glassmorphism for V2 Header */
.v2-theme header {
    background: var(--v2-glass) !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--v2-slate-100) !important;
}

body.dark header {
    background-color: var(--background-dark);
    border-bottom-color: var(--slate-800);
}

.header-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo-wrapper {
    display: flex;
    align-items: center;
    max-width: 200px;
}

.logo-img {
    height: auto;
    width: 100%;
    object-fit: contain;
}

nav {
    display: flex;
    align-items: center;
    gap: 2.25rem;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 600;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary);
}

.hamburger-btn {
    display: none;
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 2.25rem;
    padding: 0;
}

.hamburger-btn .material-symbols-outlined {
    font-size: 2.25rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    header {
        padding: 0.75rem 1rem;
    }

    .hamburger-btn {
        display: block;
    }

    nav.main-nav {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--white);
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        padding: 0 1.5rem;
        gap: 1.5rem; /* Better spacing for mobile */
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px) scale(0.98);
        transform-origin: top center;
        transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1), 
                    opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1), 
                    transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), 
                    padding 0.4s cubic-bezier(0.4, 0, 0.2, 1), 
                    border-top-color 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        border-top: 1px solid transparent;
    }

    nav.main-nav.active {
        max-height: 500px;
        opacity: 1;
        visibility: visible;
        transform: translateY(0) scale(1);
        padding: 2rem 1.5rem;
        border-top-color: var(--border-light);
    }

    nav.main-nav .btn {
        display: none !important;
    }

    nav.main-nav .nav-link {
        display: block;
        font-size: 1.25rem;
        font-weight: 700;
        padding: 0.5rem 0;
        border-bottom: 1px solid var(--border-light);
        opacity: 0;
        transform: translateY(10px);
        transition: opacity 0.4s ease, transform 0.4s ease;
    }
    
    nav.main-nav.active .nav-link {
        opacity: 1;
        transform: translateY(0);
    }

    /* Staggered entry animations */
    nav.main-nav.active .nav-link:nth-child(1) { transition-delay: 0.1s; }
    nav.main-nav.active .nav-link:nth-child(2) { transition-delay: 0.15s; }
    nav.main-nav.active .nav-link:nth-child(3) { transition-delay: 0.2s; }
    nav.main-nav.active .nav-link:nth-child(4) { transition-delay: 0.25s; }
    
    nav.main-nav .nav-link:last-of-type {
        border-bottom: none;
    }
    
    /* V2 theme support */
    .v2-theme nav.main-nav {
        background: var(--v2-glass);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
    }
}