.main-header {
    background: var(--primary-color);
    box-shadow: var(--shadow);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.nav-link.active {
    background: var(--accent-color);
}

.nav-link.categories,
.nav-link.recipes {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.6rem 1.2rem;
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.nav-link.categories:hover,
.nav-link.recipes:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.2);
}

.nav-link.categories::after,
.nav-link.recipes::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
    transform-origin: right;
}

.nav-link.categories:hover::after,
.nav-link.recipes:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.logout-link {
    background: rgba(231, 76, 60, 0.1);
    color: #e74c3c;
    border: 1px solid #e74c3c;
}

.logout-link:hover {
    background: #e74c3c;
    color: white;
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .nav-menu {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .nav-link {
        padding: 0.5rem;
        font-size: 0.9rem;
    }

    .nav-link.categories,
    .nav-link.recipes {
        padding: 0.5rem 1rem;
        width: calc(50% - 0.5rem);
        justify-content: center;
    }
}