.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background-color: var(--color-dark);
    z-index: 1000;
}

.nav-logo {
    position: absolute;
    left: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-shrink: 0;
    text-decoration: none;
    color: var(--color-lightest);
}

.nav-logo img {
    height: 48px;
    width: auto;
}

.nav-brand {
    font-weight: var(--font-weight-bold);
    font-size: 1.1rem;
    white-space: nowrap;
}

.nav-links {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--color-lightest);
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-button);
    transition: background-color 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus {
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-toggle {
    display: none;
    position: absolute;
    right: 80px;
    top: 50%;
    transform: translateY(-50%);
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-lightest);
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-controls {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.theme-toggle,
.font-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-button);
    color: var(--color-lightest);
    background-color: transparent;
    transition: background-color 0.2s ease;
}

.theme-toggle:hover,
.font-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

.font-toggle {
    font-weight: var(--font-weight-semibold);
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-links {
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        transform: none;
        flex-direction: column;
        background-color: var(--color-dark);
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        display: none;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links a {
        width: 100%;
        text-align: center;
        padding: var(--spacing-md);
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-button);
    font-weight: var(--font-weight-medium);
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--color-darkest);
    color: var(--color-lightest);
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-secondary {
    background-color: var(--color-medium);
    color: var(--color-darkest);
}

.btn-secondary:hover {
    opacity: 0.9;
}

.card {
    background-color: var(--surface);
    border-radius: var(--radius-card);
    padding: var(--spacing-lg);
    border: 1px solid var(--border);
}