/**
 * IoncureX Navigation Bar CSS
 * 
 * Mobile-first, minimal animation navigation styling
 */

/* ===== CSS VARIABLES (Extending existing design system) ===== */
:root {
    /* Navigation specific colors */
    --navbar-height: 70px;
    --navbar-bg: var(--color-background-primary);
    --navbar-bg-scrolled: rgba(255, 255, 255, 0.95);
    --navbar-bg-mobile: rgba(255, 255, 255, 0.98);
    --navbar-border: var(--color-border);
    --navbar-text: var(--color-text-primary);
    --navbar-text-hover: var(--color-accent);
    --navbar-text-active: var(--color-primary);
    --navbar-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
    --navbar-shadow-scrolled: 0 4px 20px rgba(0, 0, 0, 0.12);
    
    /* Mobile menu overlay */
    --mobile-overlay-bg: rgba(0, 0, 0, 0.5);
    --mobile-menu-bg: var(--color-background-primary);
    --mobile-border: var(--color-border);
}

/* ===== NAVIGATION BAR BASE STYLES ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--navbar-bg);
    border-bottom: 1px solid var(--navbar-border);
    transition: all var(--transition-base);
    backdrop-filter: saturate(180%) blur(10px);
    -webkit-backdrop-filter: saturate(180%) blur(10px);
}

.navbar-container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: var(--navbar-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* ===== LOGO/BRAND STYLES ===== */
.navbar-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.navbar-logo {
    font-family: var(--font-family-serif);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--navbar-text);
    letter-spacing: -0.02em;
    text-decoration: none;
}

.navbar-brand:hover .navbar-logo {
    color: var(--navbar-text-hover);
    transform: translateX(2px);
}

/* ===== MOBILE MENU TOGGLE ===== */
.navbar-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    width: 40px;
    height: 40px;
}

.navbar-toggle:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.navbar-toggle-icon {
    width: 24px;
    height: 2px;
    background-color: var(--navbar-text);
    margin: 3px 0;
    transition: all var(--transition-base);
    border-radius: 2px;
}

/* Mobile menu toggle states */
.navbar.nav-open .navbar-toggle-icon:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.navbar.nav-open .navbar-toggle-icon:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.navbar.nav-open .navbar-toggle-icon:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ===== NAVIGATION LINKS ===== */
.navbar-nav {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--navbar-text);
    text-decoration: none;
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
}

.nav-link:hover {
    color: var(--navbar-text-hover);
    background-color: rgba(0, 0, 0, 0.03);
    transform: translateY(-1px);
}

.nav-link.active {
    color: var(--navbar-text-active);
    font-weight: 600;
}

/* Active link indicator */
.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 2px;
    background: var(--navbar-text-active);
    border-radius: 2px;
}

/* ===== SCROLL STATES ===== */
.navbar.navbar-scrolled {
    background-color: var(--navbar-bg-scrolled);
    border-bottom-color: rgba(0, 0, 0, 0.1);
    box-shadow: var(--navbar-shadow-scrolled);
}

.navbar.navbar-hidden {
    transform: translateY(-100%);
}

/* ===== MOBILE STYLES ===== */
@media (max-width: 991px) {
    .navbar-toggle {
        display: flex;
    }
    
    .navbar-nav {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        background-color: var(--mobile-menu-bg);
        border-top: 1px solid var(--mobile-border);
        flex-direction: column;
        gap: 0;
        padding: var(--spacing-md);
        box-shadow: var(--navbar-shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
        max-height: calc(100vh - var(--navbar-height));
        overflow-y: auto;
    }
    
    .navbar.nav-open .navbar-nav {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-item {
        width: 100%;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }
    
    .nav-item:last-child {
        border-bottom: none;
    }
    
    .nav-link {
        width: 100%;
        justify-content: flex-start;
        padding: var(--spacing-lg);
        font-size: var(--font-size-lg);
        border-radius: var(--radius-sm);
    }
    
    .nav-link:hover {
        background-color: rgba(0, 0, 0, 0.05);
    }
    
    .navbar-brand {
        padding: var(--spacing-md);
    }
    
    .navbar-logo {
        font-size: var(--font-size-2xl);
    }
    
    /* Mobile menu overlay */
    .navbar.nav-open::before {
        content: '';
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        bottom: 0;
        background-color: var(--mobile-overlay-bg);
        z-index: 999;
        opacity: 0;
        transition: opacity var(--transition-base);
    }
    
    .navbar.nav-open::before {
        opacity: 1;
    }
}

/* ===== TABLET STYLES ===== */
@media (min-width: 768px) and (max-width: 991px) {
    .navbar-container {
        padding: 0 var(--spacing-xl);
    }
    
    .navbar-nav {
        gap: var(--spacing-lg);
    }
    
    .nav-link {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-base);
    }
}

/* ===== DESKTOP STYLES ===== */
@media (min-width: 992px) {
    .navbar-container {
        padding: 0 var(--spacing-2xl);
    }
    
    .navbar-nav {
        gap: var(--spacing-lg);
    }
    
    .nav-link {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-base);
    }
    
    .nav-link:hover::before {
        content: '';
        position: absolute;
        top: -2px;
        left: -8px;
        right: -8px;
        bottom: -2px;
        background: rgba(0, 0, 0, 0.02);
        border-radius: var(--radius-md);
        z-index: -1;
        opacity: 0;
        transition: opacity var(--transition-base);
    }
    
    .nav-link:hover {
        transform: none;
    }
}

/* ===== LARGE SCREEN STYLES ===== */
@media (min-width: 1200px) {
    .navbar-container {
        padding: 0 var(--spacing-3xl);
    }
    
    .navbar-nav {
        gap: var(--spacing-xl);
    }
    
    .nav-link {
        padding: var(--spacing-sm) var(--spacing-xl);
        font-size: var(--font-size-base);
    }
}

/* ===== ACCESSIBILITY STYLES ===== */
.navbar-toggle:focus,
.nav-link:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .navbar {
        border-bottom: 2px solid var(--color-border-dark);
    }
    
    .navbar-toggle-icon {
        background-color: var(--color-text-primary);
    }
    
    .nav-link.active {
        outline: 2px solid var(--navbar-text-active);
        outline-offset: -2px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .navbar,
    .navbar-toggle,
    .navbar-toggle-icon,
    .nav-link,
    .navbar-nav {
        transition: none;
    }
    
    .navbar.navbar-hidden {
        display: none;
    }
}

/* ===== DROPDOWN SUPPORT (Future Enhancement) ===== */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    position: relative;
}

.dropdown-toggle::after {
    content: '▼';
    font-size: 0.6rem;
    margin-left: var(--spacing-xs);
    opacity: 0.6;
    transition: transform var(--transition-base);
}

.dropdown-open .dropdown-toggle::after {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--color-background-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    z-index: 1001;
}

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

.dropdown-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--color-text-primary);
    text-decoration: none;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.dropdown-item:last-child {
    border-bottom: none;
}

.dropdown-item:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--navbar-text-hover);
}

/* ===== RESPONSIVE TYPOGRAPHY ===== */
@media (max-width: 480px) {
    .navbar-logo {
        font-size: var(--font-size-xl);
    }
    
    .nav-link {
        font-size: var(--font-size-base);
        padding: var(--spacing-md);
    }
}

/* ===== PERFORMANCE OPTIMIZATION ===== */
.navbar {
    will-change: transform, background-color, box-shadow;
}

.navbar-nav {
    will-change: transform, opacity;
}

/* ===== PRINT STYLES ===== */
@media print {
    .navbar {
        display: none !important;
    }
}