/* ============================================================================
   RESPONSIVE NAVIGATION WITH DROPDOWN SUPPORT
   Mobile-first approach with collapsible navigation and dropdown menus
   ============================================================================ */

/* ===== BASE NAVIGATION (All Screens) ===== */
.nav {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-light);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.nav-logo img {
    height: 4rem;
    display: block;
    transition: height var(--transition-base);
}

/* ===== HAMBURGER MENU BUTTON (Mobile Only) ===== */
.nav-hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    z-index: 1001;
    position: relative;
}

.hamburger-icon {
    width: 28px;
    height: 20px;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.hamburger-icon span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* Hamburger Animation when Open */
.nav-hamburger.active .hamburger-icon span:nth-child(1) {
    transform: translateY(8.5px) rotate(45deg);
}

.nav-hamburger.active .hamburger-icon span:nth-child(2) {
    opacity: 0;
}

.nav-hamburger.active .hamburger-icon span:nth-child(3) {
    transform: translateY(-8.5px) rotate(-45deg);
}

/* ===== NAVIGATION LINKS (Desktop) ===== */
.nav-links {
    display: flex;
    gap: var(--spacing-2xl);
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
}

.nav-links > li {
    position: relative;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-base);
    font-size: var(--font-size-md);
    padding: var(--spacing-sm) 0;
    display: block;
}

.nav-links a:hover {
    color: var(--primary-blue);
}

.nav-links a.active {
    color: var(--primary-blue);
    font-weight: var(--font-weight-semibold);
}

/* ===== DROPDOWN MENU (Desktop) ===== */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-md);
    padding: var(--spacing-sm) 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: color var(--transition-base);
    font-family: inherit;
}

.nav-dropdown-toggle:hover {
    color: var(--primary-blue);
}

.dropdown-arrow {
    transition: transform var(--transition-base);
}

.nav-dropdown.active .dropdown-arrow {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: var(--spacing-sm);
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    list-style: none;
    padding: var(--spacing-sm) 0;
    min-width: 240px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--transition-base), 
                visibility var(--transition-base),
                transform var(--transition-base);
    z-index: 1000;
}

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

.nav-dropdown-menu li {
    margin: 0;
}

.nav-dropdown-menu a {
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    font-size: var(--font-size-md);
    transition: background-color var(--transition-base), color var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-dropdown-menu a:hover {
    background-color: var(--bg-secondary);
    color: var(--primary-blue);
}

/* Coming Soon Badge */
.badge {
    font-size: var(--font-size-xs);
    background: var(--primary-blue);
    color: white;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-weight: var(--font-weight-semibold);
}

.nav-dropdown-menu a.coming-soon {
    color: var(--text-secondary);
    cursor: default;
}

.nav-dropdown-menu a.coming-soon:hover {
    background-color: transparent;
    color: var(--text-secondary);
}

/* ===== MOBILE RESPONSIVE STYLES ===== */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 var(--spacing-md);
    }

    /* Show hamburger button */
    .nav-hamburger {
        display: block;
    }

    /* Smaller logo on mobile */
    .nav-logo img {
        height: 3rem;
    }

    /* Mobile Menu Overlay */
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-primary);
        flex-direction: column;
        gap: 0;
        padding: 80px var(--spacing-xl) var(--spacing-xl);
        box-shadow: var(--shadow-lg);
        transition: right var(--transition-slower);
        overflow-y: auto;
        z-index: 1000;
        align-items: stretch;
    }

    /* Show menu when active */
    .nav-links.active {
        right: 0;
    }

    /* Mobile menu links styling */
    .nav-links > li {
        width: 100%;
        border-bottom: 1px solid var(--border-light);
    }

    .nav-links > li:last-child {
        border-bottom: none;
    }

    .nav-links a {
        padding: var(--spacing-lg) 0;
        font-size: var(--font-size-lg);
        color: var(--text-primary);
    }

    .nav-links a:hover,
    .nav-links a.active {
        color: var(--primary-blue);
        padding-left: var(--spacing-sm);
    }

    /* Mobile Dropdown Styling */
    .nav-dropdown-toggle {
        width: 100%;
        padding: var(--spacing-lg) 0;
        font-size: var(--font-size-lg);
        color: var(--text-primary);
        justify-content: space-between;
    }

    .nav-dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        border-radius: 0;
        margin: 0;
        padding: 0;
        background: var(--bg-secondary);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base);
    }

    .nav-dropdown.active .nav-dropdown-menu {
        max-height: 400px;
        padding: var(--spacing-sm) 0;
    }

    .nav-dropdown-menu a {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-md);
    }

    /* Backdrop overlay when menu is open */
    .nav-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--transition-slower), visibility var(--transition-slower);
        z-index: 999;
    }

    .nav-backdrop.active {
        opacity: 1;
        visibility: visible;
    }
}

/* ===== TABLET (768px - 1024px) ===== */
@media (min-width: 768px) and (max-width: 1024px) {
    .nav-links {
        gap: var(--spacing-lg);
    }

    .nav-links a,
    .nav-dropdown-toggle {
        font-size: var(--font-size-sm);
    }
}

/* ===== SMALL MOBILE (< 400px) ===== */
@media (max-width: 400px) {
    .nav-logo img {
        height: 2.5rem;
    }

    .nav-links {
        width: 100%;
        right: -100%;
    }
}

/* ===== ACCESSIBILITY IMPROVEMENTS ===== */

/* Focus styles for keyboard navigation */
.nav-hamburger:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

.nav-links a:focus,
.nav-dropdown-toggle:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Prevent body scroll when mobile menu is open */
body.nav-open {
    overflow: hidden;
}

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

/* ===== PRINT STYLES ===== */
@media print {
    .nav-hamburger,
    .nav-backdrop,
    .nav-dropdown-menu {
        display: none !important;
    }

    .nav-links {
        position: static;
        display: flex;
        flex-direction: row;
        height: auto;
        width: auto;
    }
}