/* Professional Navigation Styles for 河南一一科技 - DingTalk Design System */

/* DingTalk Color Variables */
:root {
    --dingtalk-primary: #3B74F2;
    --dingtalk-primary-hover: #2E5CE6;
    --dingtalk-primary-dark: #1C4ED8;
    --dingtalk-primary-light: #EDF1FF;
    --dingtalk-primary-rgb: 59, 116, 242;
    --dingtalk-secondary: #FF6A00;
    --dingtalk-secondary-hover: #E55A00;
    --dingtalk-text-primary: #1D2129;
    --dingtalk-text-secondary: #4E5969;
    --dingtalk-text-tertiary: #86909C;
    --dingtalk-border: #E5E6EB;
    --dingtalk-border-hover: #C9CDD4;
    --dingtalk-bg: #FFFFFF;
    --dingtalk-bg-hover: #F7F8FA;
    --dingtalk-bg-secondary: #FAFBFC;
    --dingtalk-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
    --dingtalk-shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.16);
    --dingtalk-shadow-base: 0 1px 3px rgba(0, 0, 0, 0.1);
    --dingtalk-radius: 6px;
}

/* Navigation Base Styles */
#main-nav {
    background: #1e3a8a;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(59, 116, 242, 0.2);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    min-height: 60px;
}

.nav-container {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 0 2rem;
    box-sizing: border-box;
}

.nav-left {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.nav-center {
    display: flex;
    align-items: center;
    gap: 2rem;
    flex: 1;
    justify-content: center;
    white-space: nowrap;
}

.nav-right {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

@media (max-width: 1200px) {
    .nav-container {
        padding: 0 1.5rem;
    }

    .nav-center {
        gap: 1.5rem;
    }
}

@media (max-width: 1024px) {
    .nav-container {
        padding: 0 1rem;
    }

    .nav-center {
        gap: 1.2rem;
    }
}

@media (max-width: 900px) {
    .nav-container {
        padding: 0 0.8rem;
    }

    .nav-center {
        gap: 1rem;
    }
}

#main-nav.scrolled {
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--dingtalk-border);
    box-shadow: var(--dingtalk-shadow);
}

#main-nav.scrolled .nav-text {
    color: var(--dingtalk-text-primary);
}

#main-nav.scrolled .nav-link {
    color: var(--dingtalk-text-secondary);
}

#main-nav.scrolled .nav-link:hover {
    color: var(--dingtalk-primary);
}

#main-nav.scrolled .nav-link.active {
    color: var(--dingtalk-primary);
    font-weight: 600;
}

#main-nav.scrolled .hamburger-line {
    background: var(--dingtalk-text-secondary);
}

.nav-text {
    color: white;
    transition: color 0.3s ease;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    flex-shrink: 0;
}

.nav-logo {
    flex-shrink: 0;
}

.nav-logo img {
    height: 2.5rem;
    width: auto;
}

.nav-cta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.nav-cta-button {
    background: var(--dingtalk-secondary);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.85rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--dingtalk-shadow);
    white-space: nowrap;
    text-decoration: none;
}

.nav-cta-button:hover {
    background: var(--dingtalk-secondary-hover);
    transform: translateY(-1px);
    box-shadow: var(--dingtalk-shadow-hover);
}

@media (min-width: 1200px) {
    .nav-cta-button {
        padding: 0.75rem 1.5rem;
        font-size: 0.95rem;
    }
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    overflow: hidden;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    padding: 0.6rem 0.8rem;
    position: relative;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    border-radius: 6px;
    white-space: nowrap;
    font-size: 0.9rem;
    min-width: fit-content;
    flex-shrink: 0;
}

@media (min-width: 1200px) {
    .nav-link {
        padding: 0.75rem 1rem;
        font-size: 1rem;
    }

    .nav-links {
        gap: 0.75rem;
    }
}

.nav-link:hover {
    color: white;
    background: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
    color: white;
    background: rgba(255, 255, 255, 0.15);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--dingtalk-secondary);
    border-radius: 2px;
}

/* Dropdown & Mega Menu Styles - DingTalk Design */
.nav-dropdown {
    position: relative;
}

/* Enhanced styles for anchor-based dropdown triggers */
a.dropdown-trigger,
a.nav-link.dropdown-trigger {
    text-decoration: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    user-select: none;
}

.dropdown-trigger:hover .fa-chevron-down {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 280px;
    max-height: 70vh;
    background: var(--dingtalk-bg);
    border-radius: 8px;
    box-shadow: var(--dingtalk-shadow-hover);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    margin-top: 0.5rem;
    border: 1px solid var(--dingtalk-border);
    overflow: hidden;
}

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

.dropdown-content {
    padding: 0.5rem;
    max-height: 60vh;
    overflow-y: auto;
    overscroll-behavior: contain;
}

.dropdown-content::-webkit-scrollbar {
    width: 4px;
}

.dropdown-content::-webkit-scrollbar-track {
    background: var(--dingtalk-bg-hover);
    border-radius: 2px;
}

.dropdown-content::-webkit-scrollbar-thumb {
    background: var(--dingtalk-text-tertiary);
    border-radius: 2px;
}

.dropdown-content::-webkit-scrollbar-thumb:hover {
    background: var(--dingtalk-text-secondary);
}

.dropdown-item {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--dingtalk-text-secondary);
    text-decoration: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    border-radius: 6px;
    margin-bottom: 2px;
}

.dropdown-item:hover {
    background: var(--dingtalk-primary-light);
    color: var(--dingtalk-primary);
}

.dropdown-item.active {
    color: var(--dingtalk-primary);
    background: var(--dingtalk-primary-light);
}

/* Mega Menu Styles */
.mega-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 700px;
    max-width: 90vw;
    max-height: 80vh;
    background: var(--dingtalk-bg);
    border-radius: 12px;
    box-shadow: var(--dingtalk-shadow-hover);
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(-8px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    margin-top: 0.5rem;
    border: 1px solid var(--dingtalk-border);
    overflow: hidden;
}

.nav-dropdown:hover .mega-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.mega-menu-content {
    padding: 2rem;
    max-height: 75vh;
    overflow-y: auto;
    overscroll-behavior: contain;
}

.mega-menu-content::-webkit-scrollbar {
    width: 6px;
}

.mega-menu-content::-webkit-scrollbar-track {
    background: var(--dingtalk-bg-hover);
    border-radius: 3px;
}

.mega-menu-content::-webkit-scrollbar-thumb {
    background: var(--dingtalk-text-tertiary);
    border-radius: 3px;
}

.mega-menu-content::-webkit-scrollbar-thumb:hover {
    background: var(--dingtalk-text-secondary);
}

.mega-menu-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--dingtalk-border);
}

.mega-menu-main-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dingtalk-primary);
    margin-bottom: 0.5rem;
}

.mega-menu-subtitle {
    color: var(--dingtalk-text-tertiary);
    font-size: 0.875rem;
    font-weight: 500;
}

.mega-menu-sections {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.mega-menu-section {
    display: flex;
    flex-direction: column;
}

.mega-menu-section-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dingtalk-text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 2px solid var(--dingtalk-primary);
    position: relative;
}

.mega-menu-section-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--dingtalk-secondary);
}

.mega-menu-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

/* Products Grid - 3 columns for compact layout */
.products-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

/* Services and About Grid - 2 columns */
.services-mega-menu .mega-menu-grid,
.about-mega-menu .mega-menu-grid {
    grid-template-columns: repeat(2, 1fr);
}

.mega-menu-card {
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    background: var(--dingtalk-bg);
    border: 1px solid var(--dingtalk-border);
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.mega-menu-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--dingtalk-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.mega-menu-card:hover {
    background: var(--dingtalk-bg-hover);
    border-color: var(--dingtalk-primary);
    transform: translateY(-2px);
    box-shadow: var(--dingtalk-shadow-hover);
}

.mega-menu-card:hover::before {
    transform: scaleX(1);
}

.mega-menu-card-icon {
    width: 3rem;
    height: 3rem;
    background: var(--dingtalk-secondary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.mega-menu-card:hover .mega-menu-card-icon {
    background: var(--dingtalk-secondary-hover);
    transform: scale(1.05);
}

.mega-menu-card-content {
    flex: 1;
}

.mega-menu-card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dingtalk-text-primary);
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.mega-menu-card:hover .mega-menu-card-title {
    color: var(--dingtalk-primary);
}

.mega-menu-card-desc {
    color: var(--dingtalk-text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

/* Compact cards for products */
.mega-menu-card.compact {
    padding: 1rem;
}

.mega-menu-card.compact .mega-menu-card-icon {
    width: 2.5rem;
    height: 2.5rem;
    margin-bottom: 0.75rem;
}

.mega-menu-card.compact .mega-menu-card-title {
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.mega-menu-card.compact .mega-menu-card-desc {
    font-size: 0.75rem;
}

/* Featured cards for tech section */
.mega-menu-card.featured {
    padding: 1.5rem;
    background: var(--dingtalk-primary-light);
    border-color: var(--dingtalk-primary);
}

.mega-menu-card.featured .mega-menu-card-icon {
    background: var(--dingtalk-primary);
}

.mega-menu-card-features {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.feature-tag {
    background: var(--dingtalk-primary-light);
    color: var(--dingtalk-primary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

/* CTA Button - DingTalk Style */
.cta-button {
    background: var(--dingtalk-secondary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--dingtalk-shadow);
}

.cta-button:hover {
    background: var(--dingtalk-secondary-hover);
    transform: translateY(-1px);
    box-shadow: var(--dingtalk-shadow-hover);
}

/* Mobile Menu Styles - DingTalk Design */
.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 2.5rem;
    height: 2.5rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.hamburger-line {
    width: 1.5rem;
    height: 2px;
    background: rgba(255, 255, 255, 0.9);
    margin: 2px 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center;
}

#main-nav.scrolled .hamburger-line {
    background: var(--dingtalk-text-secondary);
}

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

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 998;
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 360px;
    max-width: 90vw;
    height: 100%;
    background: var(--dingtalk-bg);
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 999;
    overflow-y: auto;
    box-shadow: var(--dingtalk-shadow-hover);
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-menu-content {
    padding: 2rem 1.5rem;
    padding-top: 5rem;
}

.mobile-menu-item {
    display: block;
    padding: 1rem 0;
    color: var(--dingtalk-text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    border-bottom: 1px solid var(--dingtalk-border);
    transition: color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-menu-item:hover {
    color: var(--dingtalk-primary);
}

.mobile-menu-item.active {
    color: var(--dingtalk-primary);
    font-weight: 600;
}

/* Mobile Accordion - DingTalk Style */
.mobile-accordion-item {
    border-bottom: 1px solid var(--dingtalk-border);
}

.mobile-accordion-trigger,
a.mobile-accordion-trigger {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    background: none;
    border: none;
    color: var(--dingtalk-text-primary);
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    text-align: left;
    text-decoration: none;
    transition: color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-accordion-trigger:hover {
    color: var(--dingtalk-primary);
}

.mobile-accordion-trigger .fa-chevron-down {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--dingtalk-text-tertiary);
}

.mobile-accordion-trigger[aria-expanded="true"] .fa-chevron-down {
    transform: rotate(180deg);
    color: var(--dingtalk-primary);
}

.mobile-accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-accordion-content.active {
    max-height: 600px;
}

.mobile-submenu-item {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--dingtalk-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    margin-left: 1rem;
    border-left: 2px solid transparent;
    border-radius: 4px;
}

.mobile-submenu-item:hover {
    color: var(--dingtalk-primary);
    border-left-color: var(--dingtalk-primary);
    background: var(--dingtalk-primary-light);
}

.mobile-submenu-item.active {
    color: var(--dingtalk-primary);
    border-left-color: var(--dingtalk-primary);
    background: var(--dingtalk-primary-light);
    font-weight: 600;
}

.mobile-submenu-section {
    margin-bottom: 1.5rem;
}

.mobile-submenu-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--dingtalk-text-tertiary);
    margin: 1rem 1rem 0.5rem 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.mobile-cta-container {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--dingtalk-border);
}

.mobile-cta-button {
    display: block;
    width: 100%;
    padding: 0.875rem 1.5rem;
    background: var(--dingtalk-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--dingtalk-radius);
    font-weight: 600;
    font-size: 0.95rem;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--dingtalk-shadow-base);
    margin-bottom: 0.75rem;
}

.mobile-cta-button:hover {
    background: var(--dingtalk-primary-dark);
    box-shadow: var(--dingtalk-shadow-hover);
    transform: translateY(-1px);
}

.mobile-cta-button.secondary {
    background: transparent;
    color: var(--dingtalk-primary);
    border: 1.5px solid var(--dingtalk-primary);
    box-shadow: none;
}

.mobile-cta-button.secondary:hover {
    background: var(--dingtalk-primary-light);
    border-color: var(--dingtalk-primary-dark);
}

/* Responsive Adjustments */
@media (max-width: 1200px) {
    .mega-menu {
        min-width: 700px;
        max-width: 90vw;
    }

    .solutions-mega-menu .mega-menu-grid,
    .services-mega-menu .mega-menu-grid,
    .about-mega-menu .mega-menu-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 1024px) {
    .mega-menu {
        min-width: 600px;
        max-width: 85vw;
    }

    .mega-menu-content {
        padding: 2rem;
    }

    .solutions-mega-menu .mega-menu-grid,
    .services-mega-menu .mega-menu-grid,
    .about-mega-menu .mega-menu-grid,
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .tech-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .mega-menu {
        min-width: 500px;
        max-width: 95vw;
    }

    .mega-menu-content {
        padding: 1.5rem;
    }

    .mega-menu-header {
        margin-bottom: 2rem;
        padding-bottom: 1rem;
    }

    .mega-menu-main-title {
        font-size: 1.5rem;
    }

    .mega-menu-sections {
        gap: 2rem;
    }

    .solutions-mega-menu .mega-menu-grid,
    .services-mega-menu .mega-menu-grid,
    .about-mega-menu .mega-menu-grid,
    .products-grid,
    .tech-grid {
        grid-template-columns: 1fr;
    }

    .mega-menu-card {
        padding: 1.25rem;
    }

    .mega-menu-card.compact {
        padding: 1rem;
    }

    .mega-menu-card.featured {
        padding: 1.5rem;
    }
}

@media (max-width: 640px) {

    .dropdown-menu,
    .mega-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: transparent;
        margin-top: 0;
        min-width: auto;
        max-width: none;
        width: 100%;
        border-radius: 0;
        border: none;
    }

    .mega-menu-content {
        padding: 1rem;
    }

    .mega-menu-header {
        text-align: left;
        margin-bottom: 1.5rem;
        padding-bottom: 0.75rem;
    }

    .mega-menu-main-title {
        font-size: 1.25rem;
    }

    .mega-menu-subtitle {
        font-size: 0.875rem;
    }

    .mega-menu-card {
        padding: 1rem;
        background: white;
        border: 1px solid #E5E7EB;
        border-radius: 8px;
    }

    .mega-menu-card-icon {
        width: 2.5rem;
        height: 2.5rem;
        margin-bottom: 0.75rem;
    }

    .mega-menu-card-title {
        font-size: 1rem;
    }

    .mega-menu-card-desc {
        font-size: 0.875rem;
    }
}

/* Enhanced Responsive Navigation */
@media (max-width: 1024px) {
    .nav-link {
        padding: 0.5rem 0.6rem;
        font-size: 0.85rem;
    }

    .nav-links {
        gap: 0.25rem;
    }

    .nav-cta-button {
        padding: 0.5rem 0.8rem;
        font-size: 0.8rem;
    }
}

@media (max-width: 900px) {
    .nav-link {
        padding: 0.4rem 0.5rem;
        font-size: 0.8rem;
    }

    .nav-links {
        gap: 0.1rem;
    }

    .nav-cta-button {
        padding: 0.4rem 0.6rem;
        font-size: 0.75rem;
    }

    .nav-text {
        font-size: 0.9rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-cta {
        display: none;
    }

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

    #main-nav {
        padding: 0.75rem 1rem;
    }

    .nav-container {
        padding: 0 0.5rem;
    }

    .nav-logo img {
        height: 2rem;
    }

    .nav-text {
        font-size: 1rem;
    }

    /* Hide mega menus on mobile */
    .mega-menu {
        display: none !important;
    }
}

@media (max-width: 480px) {
    .mobile-menu {
        width: 100%;
        max-width: 100vw;
    }

    .mobile-menu-content {
        padding: 1.5rem 1rem;
        padding-top: 4rem;
    }

    .mobile-accordion-content.active {
        max-height: 400px;
    }
}

@media (min-width: 769px) {
    .mobile-menu-toggle {
        display: none;
    }

    .mobile-menu {
        display: none;
    }

    .mobile-menu-overlay {
        display: none;
    }
}

/* Enhanced Animation Performance */
.nav-item,
.mega-menu,
.dropdown-item,
.mobile-menu,
.mobile-accordion-content,
.mega-menu-card,
.nav-cta-button,
.mobile-cta-button {
    will-change: transform;
}

/* Enhanced Accessibility */
.mega-menu:focus-within {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-item:focus-within .mega-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-link:focus {
    outline: 2px solid var(--dingtalk-primary);
    outline-offset: 2px;
    border-radius: var(--dingtalk-radius);
}

.mobile-accordion-trigger:focus {
    outline: 2px solid var(--dingtalk-primary);
    outline-offset: 2px;
    border-radius: var(--dingtalk-radius);
}

.nav-cta-button:focus,
.mobile-cta-button:focus {
    outline: 2px solid var(--dingtalk-primary-dark);
    outline-offset: 2px;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Custom Scrollbar Styling for Mega Menus */
.mega-menu-container::-webkit-scrollbar {
    width: 8px;
}

.mega-menu-container::-webkit-scrollbar-track {
    background: var(--dingtalk-bg-secondary);
    border-radius: 4px;
}

.mega-menu-container::-webkit-scrollbar-thumb {
    background: var(--dingtalk-border-hover);
    border-radius: 4px;
    transition: background 0.2s ease;
}

.mega-menu-container::-webkit-scrollbar-thumb:hover {
    background: var(--dingtalk-text-tertiary);
}

.mobile-menu::-webkit-scrollbar {
    width: 6px;
}

.mobile-menu::-webkit-scrollbar-track {
    background: transparent;
}

.mobile-menu::-webkit-scrollbar-thumb {
    background: var(--dingtalk-border);
    border-radius: 3px;
}

/* Loading Animation */
.nav-loading {
    position: relative;
    overflow: hidden;
}

.nav-loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent,
            rgba(var(--dingtalk-primary-rgb), 0.15),
            transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        left: -100%;
    }

    100% {
        left: 100%;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .nav-link {
        border: 1px solid transparent;
    }

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

    .mega-menu-card {
        border: 2px solid var(--dingtalk-border);
    }
}

/* Print Styles */
@media print {

    .mega-menu,
    .mobile-menu,
    .mobile-menu-overlay,
    .nav-cta,
    .mobile-cta-container {
        display: none !important;
    }

    #main-nav {
        position: static !important;
        background: white !important;
        box-shadow: none !important;
        border-bottom: 2px solid #000;
    }
}

/* Enhanced Focus Management */
.mega-menu-card:focus-within {
    transform: translateY(-2px);
    box-shadow: var(--dingtalk-shadow-hover);
}

.mobile-submenu-item:focus {
    outline: 2px solid var(--dingtalk-primary);
    outline-offset: 1px;
    background: var(--dingtalk-primary-light);
}

/* Smooth Scroll Behavior */
html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}