/* ===== NAVIGATION STYLES ===== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.nav-container {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

/* ===== BRAND/LOGO ===== */
.nav-brand {
    flex-shrink: 0;
}

.brand-link {
    display: block;
    text-decoration: none;
    color: inherit;
    transition: transform var(--transition-fast);
}

.brand-link:hover {
    transform: scale(1.02);
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.brand-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-blue);
    flex-shrink: 0;
    transition: color var(--transition-fast);
}

.brand-text {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--gray-900);
    letter-spacing: -0.025em;
    transition: color var(--transition-fast);
}

/* ===== DESKTOP NAVIGATION LINKS ===== */
.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    margin: 0 var(--space-8);
}

.nav-link {
    position: relative;
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    color: var(--gray-700);
    text-decoration: none;
    padding: var(--space-2) 0;
    transition: color var(--transition-fast);
}

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

.nav-link.active {
    color: var(--primary-blue);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* ===== CTA BUTTON ===== */
.nav-cta {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

/* Login Button - Modern Square Design */
.btn-login {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    background: var(--primary-blue);
    color: var(--white);
    padding: 10px 24px;
    border-radius: 4px;
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    border: none;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.01em;
}

.btn-login::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn-login:hover {
    background: #1e40af;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-login:hover::before {
    opacity: 1;
}

.btn-login:active {
    transform: translateY(0);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.btn-login .btn-text {
    white-space: nowrap;
    position: relative;
    z-index: 1;
}

/* ===== MOBILE MENU TOGGLE ===== */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    width: 30px;
    height: 30px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.hamburger-line {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--gray-700);
    margin: 2px 0;
    transition: all var(--transition-base);
    border-radius: 1px;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ===== MOBILE MENU ===== */
.mobile-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

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

.mobile-menu-content {
    padding: var(--space-6) var(--space-4);
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.mobile-nav-link {
    font-size: var(--text-lg);
    font-weight: var(--font-medium);
    color: var(--gray-700);
    text-decoration: none;
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--gray-100);
    transition: color var(--transition-fast);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    color: var(--primary-blue);
}

.mobile-nav-link:last-child {
    border-bottom: none;
}

.mobile-cta {
    padding-top: var(--space-4);
    border-top: 1px solid var(--gray-200);
}

/* Mobile Login Button - Modern Square Design */
.btn-login-mobile {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    width: 100%;
    background: var(--primary-blue);
    color: var(--white);
    padding: 14px var(--space-6);
    border-radius: 4px;
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    border: none;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.01em;
}

.btn-login-mobile::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn-login-mobile:hover {
    background: #1e40af;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-login-mobile:hover::before {
    opacity: 1;
}

.btn-login-mobile:active {
    transform: scale(0.98);
}

.btn-login-mobile span {
    position: relative;
    z-index: 1;
}

/* ===== RESPONSIVE UTILITIES ===== */
.desktop-only {
    display: flex;
}

.mobile-only {
    display: none;
}

/* ===== RESPONSIVE BREAKPOINTS ===== */
@media (max-width: 1023px) {
    .desktop-only {
        display: none;
    }
    
    .mobile-only {
        display: flex;
    }
    
    .nav-container {
        padding: 0 var(--space-4);
    }
}

@media (max-width: 767px) {
    .nav-container {
        height: 60px;
        padding: 0 var(--space-3);
    }
    
    .brand-icon {
        width: 28px;
        height: 28px;
    }
    
    .brand-text {
        font-size: var(--text-lg);
    }
    
    .btn-login {
        padding: 8px 18px;
        font-size: var(--text-xs);
    }
    
    .mobile-menu-content {
        padding: var(--space-4);
    }
}

/* ===== ANIMATIONS ===== */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mobile-menu.active {
    animation: slideDown var(--transition-base);
}

/* ===== ACCESSIBILITY ===== */
.nav-link:focus,
.btn-login:focus,
.mobile-menu-toggle:focus,
.mobile-nav-link:focus,
.btn-login-mobile:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

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

/* ===== HIGH CONTRAST MODE ===== */
@media (prefers-contrast: high) {
    .navbar {
        border-bottom: 2px solid var(--gray-900);
    }
    
    .nav-link {
        color: var(--gray-900);
    }
    
    .btn-login,
    .btn-login-mobile {
        border: 2px solid var(--gray-900);
    }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
    .navbar,
    .nav-link,
    .btn-login,
    .btn-login-mobile,
    .mobile-menu,
    .hamburger-line,
    .brand-link,
    .brand-icon,
    .brand-text {
        transition: none;
    }
    
    .btn-login::before,
    .btn-login-mobile::before {
        display: none;
    }
}

/* ===== PERFECT DARK MODE ===== */
@media (prefers-color-scheme: dark) {
    /* Navbar background and blur */
    .navbar {
        background: rgba(15, 23, 42, 0.95);
        border-bottom: 1px solid var(--dark-border);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
    }
    
    .navbar.scrolled {
        background: rgba(15, 23, 42, 0.98);
        box-shadow: var(--shadow-dark-sm);
        border-bottom: 1px solid var(--dark-surface);
    }
    
    /* Brand styling */
    .brand-text {
        color: var(--dark-text);
    }
    
    .brand-icon {
        color: var(--blue-400);
    }
    
    /* Navigation links */
    .nav-link {
        color: var(--dark-text-secondary);
    }
    
    .nav-link:hover,
    .nav-link.active {
        color: var(--blue-400);
    }
    
    .nav-link::after {
        background: var(--blue-400);
    }
    
    /* Login button - dark mode */
    .btn-login {
        background: var(--blue-600);
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    }
    
    .btn-login:hover {
        background: var(--blue-500);
        box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
    }
    
    /* Mobile menu toggle */
    .hamburger-line {
        background: var(--dark-text-secondary);
    }
    
    .mobile-menu-toggle[aria-expanded="true"] .hamburger-line {
        background: var(--blue-400);
    }
    
    /* Mobile menu */
    .mobile-menu {
        background: rgba(15, 23, 42, 0.98);
        border-bottom: 1px solid var(--dark-border);
        box-shadow: var(--shadow-dark-lg);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
    }
    
    .mobile-nav-link {
        color: var(--dark-text-secondary);
        border-bottom-color: var(--dark-surface);
    }
    
    .mobile-nav-link:hover,
    .mobile-nav-link.active {
        color: var(--blue-400);
    }
    
    .mobile-cta {
        border-top-color: var(--dark-border);
    }
    
    /* Mobile Login button - dark mode */
    .btn-login-mobile {
        background: var(--blue-600);
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    }
    
    .btn-login-mobile:hover {
        background: var(--blue-500);
        box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
    }
    
    /* Focus states for dark mode */
    .nav-link:focus,
    .btn-login:focus,
    .mobile-menu-toggle:focus,
    .mobile-nav-link:focus,
    .btn-login-mobile:focus {
        outline-color: var(--blue-400);
    }
    
    /* High contrast adjustments for dark mode */
    @media (prefers-contrast: high) {
        .navbar {
            background: var(--dark-bg);
            border-bottom: 2px solid var(--dark-text);
        }
        
        .brand-text,
        .nav-link,
        .mobile-nav-link {
            color: var(--dark-text);
        }
        
        .btn-login,
        .btn-login-mobile {
            border: 2px solid var(--dark-text);
        }
        
        .hamburger-line {
            background: var(--dark-text);
        }
    }
}