.site-header {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    transition: all var(--transition-base);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
    padding: 0.75rem 0;
}

.header-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--text-main);
    text-decoration: none;
    transition: all var(--transition-base);
}

.logo:hover {
    color: var(--accent-color);
    transform: scale(1.05);
}

.logo .logo-icon {
    width: 32px !important;
    height: 32px !important;
    max-width: 32px;
    max-height: 32px;
    min-width: 32px;
    border-radius: 8px;
    object-fit: contain;
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.logo:hover .logo-icon {
    transform: rotate(-5deg) scale(1.1);
}

.footer-logo .logo-icon {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    object-fit: contain;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex: 1;
    justify-content: center;
}

.main-nav>a,
.main-nav>.dropdown>a {
    color: var(--text-sub);
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
}

.main-nav>a:hover,
.main-nav>.dropdown>a:hover {
    color: var(--text-main);
    background: var(--glass-bg);
}

.main-nav>a.active {
    color: var(--accent-color);
    background: var(--accent-light);
}

/* ==================== DROPDOWN & MEGA MENU ==================== */
.dropdown {
    position: relative;
}

.dropdown>a {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* ==================== SIMPLE DROPDOWN MENU (used on tool pages) ==================== */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    min-width: 200px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15), 0 4px 12px rgba(0, 0, 0, 0.08);
    padding: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: var(--z-dropdown);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.dropdown:hover>.dropdown-menu,
.dropdown:focus-within>.dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* Bridge gap to prevent menu from closing when moving mouse down */
.dropdown::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 0.5rem;
    background: transparent;
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 0.85rem;
    color: var(--text-sub);
    font-size: 0.85rem;
    font-weight: var(--font-medium);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
}

.dropdown-menu a i {
    font-size: 0.9rem;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.dropdown-menu a:hover {
    color: var(--accent-color);
    background: var(--accent-light);
    transform: translateX(4px);
}

.dropdown-menu a.active {
    color: var(--accent-color);
    background: var(--accent-light);
}

/* Hide simple dropdown menu during scroll */
.dropdown.scrolling>.dropdown-menu {
    opacity: 0 !important;
    visibility: hidden !important;
    transform: translateX(-50%) translateY(-8px) !important;
}

.dropdown-arrow {
    font-size: 0.65rem;
    transition: transform 0.3s ease;
}

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

/* Mega Menu Panel */
.mega-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    width: 100%;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15), 0 4px 12px rgba(0, 0, 0, 0.08);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: var(--z-dropdown);
    overflow: hidden;
}

.site-header.scrolled .mega-menu {
    top: 56px;
}

.mega-dropdown:hover .mega-menu,
.mega-dropdown:focus-within .mega-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.mega-dropdown::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 1rem;
    background: transparent;
}

/* Mega Menu Inner Container */
.mega-menu-inner {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 1.5rem 2rem;
}

/* Mega Menu Columns */
.mega-menu-column {
    padding: 0 1rem;
    border-right: 1px solid var(--border-color);
}

.mega-menu-column:last-child {
    border-right: none;
}

/* Category Header */
.mega-menu-category-header {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.6rem;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-main);
    border-radius: var(--radius-md);
    position: relative;
}

.mega-menu-category-header i {
    font-size: 1rem;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

/* Category-specific icon colors */
.mega-menu-column:nth-child(1) .mega-menu-category-header i {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.mega-menu-column:nth-child(2) .mega-menu-category-header i {
    color: #8b5cf6;
    background: rgba(139, 92, 246, 0.1);
}

.mega-menu-column:nth-child(3) .mega-menu-category-header i {
    color: #3b82f6;
    background: rgba(59, 130, 246, 0.1);
}

.mega-menu-column:nth-child(4) .mega-menu-category-header i {
    color: #10b981;
    background: rgba(16, 185, 129, 0.1);
}

.mega-menu-column:nth-child(5) .mega-menu-category-header i {
    color: #f59e0b;
    background: rgba(245, 158, 11, 0.1);
}

/* Tool Links */
.mega-menu-column a {
    display: block;
    padding: 0.45rem 0.75rem;
    color: var(--text-sub);
    font-size: 0.82rem;
    font-weight: 400;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    text-decoration: none;
    border-left: 2px solid transparent;
}

.mega-menu-column a:hover {
    color: var(--accent-color);
    background: var(--accent-light);
    border-left-color: var(--accent-color);
    padding-left: 1rem;
}

/* Scrolling state - hide mega menu */
.mega-dropdown.scrolling .mega-menu {
    opacity: 0 !important;
    visibility: hidden !important;
    transform: translateY(-8px) !important;
}

/* ==================== MOBILE MEGA MENU SECTIONS ==================== */
.mobile-mega-section {
    margin: 0;
}

.mobile-mega-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-main);
    font-size: var(--text-lg);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--transition-base);
}

.mobile-mega-toggle span {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.mobile-mega-toggle span i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.mobile-mega-arrow {
    font-size: 0.8rem;
    color: var(--text-muted);
    transition: transform 0.3s ease;
}

.mobile-mega-toggle.active .mobile-mega-arrow {
    transform: rotate(180deg);
}

.mobile-mega-toggle:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.mobile-mega-toggle:hover span i,
.mobile-mega-toggle:hover .mobile-mega-arrow {
    color: white;
}

.mobile-mega-links {
    display: none;
    padding: 0.5rem 0 0.5rem 1rem;
    flex-direction: column;
    gap: 0.25rem;
}

.mobile-mega-links.active {
    display: flex;
    animation: slideDownMega 0.3s ease;
}

.mobile-mega-links a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.7rem 1rem;
    background: transparent;
    border: none;
    border-left: 2px solid var(--border-color);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--text-sub);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    transition: all var(--transition-base);
}

.mobile-mega-links a:hover {
    background: var(--accent-light);
    color: var(--accent-color);
    border-left-color: var(--accent-color);
    transform: translateX(4px);
}

@keyframes slideDownMega {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

#theme-toggle {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    font-size: 1.2rem;
}

#theme-toggle:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: rotate(180deg);
}

.mobile-menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    font-size: 1.2rem;
}

.mobile-menu-toggle:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.mobile-menu-toggle.active {
    background: var(--accent-color);
    color: white;
}

.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-color);
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    overflow-y: auto;
    padding: var(--spacing-xl);
    padding-top: 5rem;
}

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

.mobile-menu-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: all var(--transition-base);
}

.mobile-menu-close:hover {
    background: var(--accent-color);
    color: white;
    transform: rotate(90deg);
}

.mobile-menu-nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.mobile-menu-nav a {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-main);
    font-size: var(--text-lg);
    font-weight: var(--font-medium);
    transition: all var(--transition-base);
}

.mobile-menu-nav a:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: translateX(8px);
}

.mobile-menu-nav a i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.mobile-menu-nav a:hover i {
    color: white;
}

.mobile-menu-category {
    margin-top: var(--spacing-lg);
}

.mobile-menu-category h3 {
    color: var(--text-sub);
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-sm);
}

.mobile-bottom-nav {
    display: none;

    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: rgba(26, 26, 30, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border-color);
    padding-bottom: env(safe-area-inset-bottom);

    z-index: var(--z-fixed);
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .mobile-bottom-nav {
    background: rgba(255, 255, 255, 0.95);
}

.mobile-bottom-nav-container {
    display: flex;
    justify-content: space-around;
    align-items: center;
    height: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.mobile-bottom-nav .nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    transition: all var(--transition-base);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    min-width: 60px;
    position: relative;
}

.mobile-bottom-nav .nav-item i {
    font-size: 1.25rem;
    transition: all var(--transition-base);
}

.mobile-bottom-nav .nav-item span {
    font-size: 0.7rem;
    transition: all var(--transition-base);
}

.mobile-bottom-nav .nav-item.active,
.mobile-bottom-nav .nav-item:active {
    color: var(--accent-color);
    transform: translateY(-3px);
}

.mobile-bottom-nav .nav-item.active i,
.mobile-bottom-nav .nav-item:active i {
    transform: scale(1.1);
}

@media (hover: hover) {
    .mobile-bottom-nav .nav-item:hover {
        color: var(--accent-color);
        background: var(--accent-light);
    }
}

.mobile-bottom-nav .nav-item.active::before {
    content: '';
    position: absolute;
    top: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 3px;
    background: var(--accent-color);
    border-radius: var(--radius-full);
}

@media (max-width: 1023px) {
    .main-nav {
        display: none;
    }

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

@media (max-width: 767px) {
    .site-header {
        padding: 0.75rem 0;
    }

    .logo {
        font-size: var(--text-lg);
    }

    .logo .logo-icon {
        width: 28px;
        height: 28px;
    }


    .mobile-bottom-nav {
        display: block;
    }


    body {
        padding-bottom: calc(60px + env(safe-area-inset-bottom));
    }


    #theme-toggle {
        display: none;
    }
}

@media (min-width: 1024px) {
    .mobile-menu-toggle {
        display: none;
    }

    .mobile-bottom-nav {
        display: none !important;
    }
}

.header-search {
    position: relative;
    max-width: 300px;
    flex: 1;
}

.header-search input {
    width: 100%;
    padding: 0.5rem 1rem;
    padding-left: 2.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-main);
    font-size: var(--text-sm);
    transition: all var(--transition-base);
}

.header-search input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.header-search i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

@media (max-width: 767px) {
    .header-search {
        display: none;
    }
}

.skip-to-main {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--accent-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    z-index: 9999;
    transition: top var(--transition-base);
}

.skip-to-main:focus {
    top: 1rem;
    left: 1rem;
}

[aria-label] {
    cursor: help;
}

.main-nav a:focus-visible,
.mobile-bottom-nav .nav-item:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.site-header {
    animation: slideDown 0.4s ease;
}

@keyframes fadeInMenu {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.mobile-menu-overlay.active .mobile-menu-nav {
    animation: fadeInMenu 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.mobile-bottom-nav {
    animation: slideUp 0.4s ease;
}