/* Navigation - Apple Design System */

nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    box-shadow: 0 0.5px 0 0 var(--apple-separator);
    z-index: 1000;
    padding: var(--spacing-md) 0;
    transition: all var(--transition-base), background-color 0.3s ease;
    margin: 0;
}

@media (prefers-color-scheme: dark) {
    nav {
        background: rgba(0, 0, 0, 0.8);
    }
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-sizing: border-box;
    width: 100%;
}

.logo {
    font-size: var(--font-size-title-2);
    font-weight: 600;
    letter-spacing: -0.5px;
}

.logo a {
    text-decoration: none;
    color: var(--apple-label);
    transition: opacity var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
    display: inline-block;
}

.logo a:hover {
    opacity: 0.7;
}

.logo a:active {
    opacity: 0.5;
}

.nav-links {
    display: flex;
    gap: var(--spacing-xl);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links li {
    margin: 0;
    padding: 0;
}

.nav-links a {
    text-decoration: none;
    color: var(--apple-label);
    font-size: var(--font-size-body);
    font-weight: 400;
    letter-spacing: -0.41px;
    transition: color var(--transition-fast);
    padding: var(--spacing-xs) 0;
    -webkit-tap-highlight-color: transparent;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--apple-accent);
    transition: width var(--transition-fast);
}

.nav-links a:hover {
    color: var(--apple-accent);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-links a:active {
    opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
    nav {
        padding: var(--spacing-sm) 0;
        width: 100%;
        box-sizing: border-box;
    }
    
    .nav-container {
        padding: 0 var(--spacing-md);
        width: 100%;
        box-sizing: border-box;
    }
    
    .logo {
        font-size: var(--font-size-title-3);
    }
    
    .logo a {
        font-size: var(--font-size-title-3);
    }
    
    .nav-links {
        display: none;
    }
    
    .logo a {
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
    }
}

@media (max-width: 480px) {
    nav {
        padding: var(--spacing-xs) 0;
    }
    
    .nav-container {
        padding: 0 var(--spacing-sm);
    }
    
    .logo {
        font-size: var(--font-size-headline);
    }
    
    .logo a {
        font-size: var(--font-size-headline);
    }
}