#ai_header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

#ai_header .navbar {
    padding: 1.5rem 0 !important;
    transition: padding 0.3s ease;
}

#ai_header.scrolled .navbar {
    padding: 0.5rem 0 !important;
}

#ai_header .nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

/* Brand */
#ai_header .nav-brand {
    display: flex;
    align-items: center;
}

#ai_header .brand-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

#ai_header .brand-logo {
    width: auto;
    height: 120px !important;
    max-width: 240px;
    object-fit: contain;
    display: block;
    transform: scale(1.5) translateX(-30px) !important;
    transform-origin: left center;
    margin: -15px 0 -15px -35px !important;
    transition: height 0.3s ease, transform 0.3s ease, margin 0.3s ease;
}

#ai_header.scrolled .brand-logo {
    height: 80px !important;
    transform: scale(1.3) translateX(-25px) !important;
    margin: -10px 0 -10px -30px !important;
}

#ai_header .brand-text {
    display: flex;
    flex-direction: column;
}

#ai_header .site-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--brand-dark);
    line-height: 1;
}

#ai_header .brand-tagline {
    font-size: 0.75rem;
    color: var(--brand-neutral);
    margin-top: 0.125rem;
}

/* Navigation */
#ai_header .site-navigation-1 {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
    margin: 0;
    padding: 0;
    flex: 1;
    justify-content: center;
}

#ai_header .nav-item {
    position: relative;
}

#ai_header .nav-link {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 0.75rem;
    color: var(--brand-dark);
    font-weight: 500;
    font-size: 0.9rem;
    white-space: nowrap;
    transition: all 0.3s ease;
    border-radius: 0.5rem;
}

#ai_header .nav-link:hover {
    color: var(--brand-primary);
    background: var(--medical-blue-light);
}

#ai_header .dropdown-arrow {
    font-size: 0.75rem;
    transition: transform 0.3s ease;
}

#ai_header .dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

/* Dropdown Menu */
#ai_header .dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    border-radius: 0.75rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    padding: 0.5rem;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    list-style: none;
    margin-top: 0.5rem;
}

#ai_header .dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#ai_header .dropdown-menu li {
    margin: 0;
}

#ai_header .dropdown-menu a {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--brand-dark);
    transition: all 0.3s ease;
    border-radius: 0.5rem;
    font-size: 0.9rem;
}

#ai_header .dropdown-menu a:hover {
    background: var(--medical-blue-light);
    color: var(--brand-primary);
}

/* Action Buttons */
#ai_header .nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

#ai_header .site-button {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    background: transparent;
    color: var(--brand-dark);
    white-space: nowrap;
}

#ai_header .search-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.5rem;
    padding: 0;
}

#ai_header .search-btn:hover,
#ai_header .cart-btn:hover {
    background: var(--medical-blue-light);
    color: var(--brand-primary);
}

#ai_header .cart-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.5rem;
    padding: 0;
    position: relative;
}

#ai_header .header-signin:hover {
    background: var(--medical-blue-light);
    color: var(--brand-primary);
}

#ai_header .header-subscribe {
    background: var(--brand-primary);
    color: white;
}

#ai_header .header-subscribe:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* Mobile Menu Toggle */
#ai_header .mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

#ai_header .mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--brand-dark);
    transition: all 0.3s ease;
    margin: 0 auto;
}

#ai_header .mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

#ai_header .mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

#ai_header .mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Navigation */
#ai_header .mobile-nav {
    display: none;
    position: fixed;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

#ai_header .mobile-nav.active {
    max-height: 80vh;
    overflow-y: auto;
}

#ai_header .mobile-navigation {
    list-style: none;
    padding: 1rem;
    margin: 0;
}

#ai_header .mobile-navigation li {
    margin: 0;
}

#ai_header .mobile-navigation a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--brand-dark);
    font-weight: 500;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

#ai_header .mobile-navigation a:hover {
    background: var(--medical-blue-light);
    color: var(--brand-primary);
}

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

#ai_header .dropdown-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

#ai_header .dropdown-toggle i {
    transition: transform 0.3s ease;
    font-size: 0.75rem;
}

#ai_header .has-submenu.active .dropdown-toggle i {
    transform: rotate(180deg);
}

#ai_header .mobile-submenu {
    display: none;
    list-style: none;
    padding: 0;
    margin: 0;
    background: var(--medical-gray);
    border-radius: 0.5rem;
    margin-top: 0.5rem;
}

#ai_header .has-submenu.active .mobile-submenu {
    display: block;
}

#ai_header .mobile-submenu a {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
}

#ai_header .mobile-actions {
    padding: 0 1rem 1rem;
    display: flex;
    gap: 0.75rem;
}

#ai_header .mobile-actions .site-button {
    flex: 1;
    text-align: center;
    padding: 0.75rem;
}

/* Responsive */
@media (max-width: 1200px) {
    #ai_header .nav-link {
        font-size: 0.85rem;
        padding: 0.4rem 0.6rem;
    }

    #ai_header .site-button {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}

@media (max-width: 968px) {
    #ai_header .site-navigation-1,
    #ai_header .nav-actions {
        display: none;
    }

    #ai_header .mobile-menu-toggle {
        display: flex;
    }

    #ai_header .mobile-nav {
        display: block;
    }

    #ai_header .nav-wrapper {
        gap: 1rem;
        justify-content: space-between;
    }

    #ai_header .nav-brand {
        margin-right: auto;
    }

    #ai_header .brand-link {
        justify-content: flex-start;
    }
}

@media (max-width: 480px) {
    #ai_header .brand-logo {
        height: 80px;
        max-width: 160px;
        transform: scale(1.3);
        transform-origin: left center;
        margin: -10px 0 -10px -10px;
    }

    #ai_header .site-title {
        font-size: 1.15rem;
    }

    #ai_header .brand-tagline {
        font-size: 0.7rem;
    }
}

/* Scrolled State */
#ai_header.scrolled {
    background: rgba(255, 255, 255, 1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    border-bottom: 2px solid var(--brand-gold);
}

body.scrolled {
    padding-top: 80px;
}

/* Page type detection for header visibility */
body {
    padding-top: 80px; /* Account for fixed header */
}


/* Faster 2.0 ecommerce cart badge integration. */
#ai_header .cart-count {
    position: absolute;
    top: -0.25rem;
    right: -0.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.125rem;
    height: 1.125rem;
    padding: 0 0.3rem;
    border-radius: 999px;
    background: var(--brand-primary);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    line-height: 1;
}

#ai_header .cart-count[hidden] {
    display: none;
}

#ai_header .mobile-actions .cart-btn {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
}

#ai_header .mobile-actions .cart-count {
    position: static;
}