/* Header Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-bg-primary);
    border-bottom: var(--border-width) solid var(--color-border);
    z-index: var(--z-fixed);
    transition: all var(--duration-base) var(--ease-out);
}

.header--scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* Ensure mobile toggle visibility when scrolled */
.header--scrolled .nav__toggle-line {
    background-color: var(--color-text-primary);
}

.header--scrolled .nav__logo {
    color: var(--color-text-primary);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--container-padding);
    min-height: 60px;
}

/* Brand/Logo */
.nav__brand {
    z-index: var(--z-fixed);
}

.nav__logo {
    font-family: var(--font-family-heading);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    text-decoration: none;
    letter-spacing: -0.025em;
    transition: color var(--duration-base) var(--ease-out);
}

.nav__logo:hover {
    color: var(--color-text-secondary);
}

/* Navigation Menu */
.nav__menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav__item {
    margin: 0;
}

.nav__link {
    font-family: var(--font-family-heading);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--duration-base) var(--ease-out);
    position: relative;
}

.nav__link:hover,
.nav__link--active {
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
}

.nav__link:focus {
    outline: 2px solid var(--color-text-primary);
    outline-offset: 2px;
}

/* Mobile Toggle Button */
.nav__toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: var(--z-fixed);
}

.nav__toggle-line {
    width: 20px;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: all var(--duration-base) var(--ease-out);
    transform-origin: center;
}

.nav__toggle-line:not(:last-child) {
    margin-bottom: 4px;
}

/* Mobile menu open state */
.nav__toggle--open .nav__toggle-line:nth-child(1) {
    transform: rotate(45deg) translate(3px, 3px);
}

.nav__toggle--open .nav__toggle-line:nth-child(2) {
    opacity: 0;
}

.nav__toggle--open .nav__toggle-line:nth-child(3) {
    transform: rotate(-45deg) translate(3px, -3px);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg-primary);
    transform: translateX(100%);
    transition: transform var(--duration-slow) var(--ease-out);
    z-index: var(--z-modal);
    display: block;
}

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



.mobile-menu__list {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    gap: var(--spacing-2xl);
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-menu__item {
    margin: 0;
}

.mobile-menu__link {
    font-family: var(--font-family-heading);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-sm);
    transition: all var(--duration-base) var(--ease-out);
}

.mobile-menu__link:hover,
.mobile-menu__link:focus {
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
}

/* Responsive Navigation Styles */
/* Mobile and Tablet (up to 1024px) */
@media screen and (max-width: 1024px) {
    /* Show hamburger menu button */
    .nav__toggle {
        display: flex !important;
    }
    
    /* Hide desktop navigation menu */
    .nav__menu {
        display: none !important;
    }
    
    /* Mobile menu stays off-screen by default (controlled by transform) */
    .mobile-menu {
        display: block !important;
    }
    
    /* Prevent body scroll when menu is open */
    body.nav-open {
        overflow: hidden;
    }
}

/* Desktop (1025px and above) */
@media screen and (min-width: 1025px) {
    /* Show desktop navigation menu */
    .nav__menu {
        display: flex !important;
        gap: var(--spacing-xl);
    }
    
    /* Hide hamburger menu button */
    .nav__toggle {
        display: none !important;
    }
    
    /* Hide mobile menu completely */
    .mobile-menu {
        display: none !important;
    }
    
    /* Desktop navigation link styles */
    .nav__link {
        font-size: var(--font-size-sm);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

/* Force correct mobile navigation display - Debug Styles */
@media screen and (max-width: 1024px) {
    /* Ensure hamburger is visible on mobile */
    .header .nav__toggle,
    #header .nav__toggle,
    nav .nav__toggle {
        display: flex !important;
        visibility: visible !important;
        opacity: 1 !important;
    }
    
    /* Ensure desktop menu is hidden on mobile */
    .header .nav__menu,
    #header .nav__menu,
    nav .nav__menu,
    #nav-menu {
        display: none !important;
        visibility: hidden !important;
    }
}

/* Smooth scroll offset for fixed header */
html {
    scroll-padding-top: 80px;
}

/* Active link indicator */
.nav__link--active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background-color: var(--color-text-primary);
    border-radius: 50%;
}

@media (max-width: 1024px) {
    .nav__link--active::after {
        display: none;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .header {
        border-bottom-width: var(--border-width-thick);
    }
    
    .nav__link:hover,
    .nav__link--active {
        background-color: var(--color-text-primary);
        color: var(--color-bg-primary);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .nav__menu,
    .nav__toggle-line,
    .nav__link {
        transition: none;
    }
}