/* Navigation Styles */
.header {
    position: sticky;
    top: 0;
    z-index: 50;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e5e7eb;
}

.nav {
    height: 4rem;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Brand */
.nav-brand {
    display: flex;
    align-items: center;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: #111827;
    font-weight: 700;
    font-size: 1.25rem;
    transition: color 0.3s ease;
}

.brand-link:hover {
    color: #2563eb;
}

.brand-icon {
    width: 2rem;
    height: 2rem;
    color: #2563eb;
}

.brand-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: #111827;
}

/* Navigation Menu */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    text-decoration: none;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.nav-link:hover {
    color: #2563eb;
    background: #f3f4f6;
}

.nav-link-active {
    color: #2563eb;
    background: #dbeafe;
}

.nav-link-active::after {
    content: '';
    position: absolute;
    bottom: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
    width: 0.5rem;
    height: 0.5rem;
    background: #2563eb;
    border-radius: 50%;
}

/* Navigation Actions */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.auth-buttons {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* User Menu */
.user-menu {
    position: relative;
}

.user-dropdown {
    position: relative;
}

.user-button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.user-button:hover {
    background: #f9fafb;
    border-color: #2563eb;
}

.user-icon {
    width: 1rem;
    height: 1rem;
    color: #6b7280;
}

.chevron-icon {
    width: 0.875rem;
    height: 0.875rem;
    color: #6b7280;
    transition: transform 0.3s ease;
}

.user-button.active .chevron-icon {
    transform: rotate(180deg);
}

.user-dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    min-width: 12rem;
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    z-index: 10;
    animation: dropdownSlide 0.2s ease-out;
}

@keyframes dropdownSlide {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    color: #374151;
    text-decoration: none;
    border: none;
    background: none;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.dropdown-item:hover {
    background: #f3f4f6;
    color: #2563eb;
}

.dropdown-item:first-child {
    border-top-left-radius: 0.5rem;
    border-top-right-radius: 0.5rem;
}

.dropdown-item:last-child {
    border-bottom-left-radius: 0.5rem;
    border-bottom-right-radius: 0.5rem;
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 1.5rem;
    height: 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.hamburger-line {
    width: 100%;
    height: 2px;
    background: #374151;
    border-radius: 1px;
    transition: all 0.3s ease;
}

.mobile-menu-btn.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Navigation */
.mobile-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border-top: 1px solid #e5e7eb;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    animation: mobileSlide 0.3s ease-out;
}

@keyframes mobileSlide {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mobile-nav-menu {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-weight: 500;
    color: #374151;
    text-decoration: none;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.mobile-nav-link:hover {
    color: #2563eb;
    background: #f3f4f6;
}

.mobile-nav-link.active {
    color: #2563eb;
    background: #dbeafe;
}

.mobile-nav-actions {
    padding: 1rem;
    border-top: 1px solid #f3f4f6;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .nav-actions .auth-buttons {
        display: none;
    }
    
    .nav-actions .user-menu {
        display: none;
    }
}

@media (max-width: 640px) {
    .nav-container {
        padding: 0 0.75rem;
    }
    
    .brand-text {
        font-size: 1.125rem;
    }
    
    .brand-icon {
        width: 1.75rem;
        height: 1.75rem;
    }
}

/* Navigation Scroll Effect */
.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
}

/* Focus States */
.nav-link:focus,
.user-button:focus,
.mobile-menu-btn:focus {
    outline: 2px solid #2563eb;
    outline-offset: 2px;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .nav-link:hover,
    .nav-link-active {
        background: #000;
        color: #fff;
    }
    
    .user-button:hover {
        background: #000;
        color: #fff;
        border-color: #000;
    }
}