.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.grid {
    display: grid;
    gap: var(--spacing-4);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(1, 1fr); }
.grid-4 { grid-template-columns: repeat(2, 1fr); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-between { justify-content: space-between; }
.flex-center { justify-content: center; align-items: center; }
.align-center { align-items: center; }
.gap-2 { gap: var(--spacing-2); }
.gap-4 { gap: var(--spacing-4); }

/* Top Header */
.top-bar {
    position: sticky;
    top: 0;
    background: var(--color-surface);
    height: 64px;
    box-shadow: var(--shadow-sm);
    z-index: 100;
    display: flex;
    align-items: center;
}

.brand {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.top-bar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

/* Desktop Nav (hidden on mobile) */
.desktop-nav { display: none; }

/* Bottom Nav (Mobile) */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-surface);
    height: 64px;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-shadow: 0 -4px 16px rgba(0,0,0,0.05);
    z-index: 100;
    padding-bottom: env(safe-area-inset-bottom);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: var(--text-xs);
    font-weight: 500;
    gap: 4px;
    width: 20%;
    position: relative;
    transition: color var(--transition-fast);
}

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

.nav-icon {
    font-size: 24px;
}

.cart-badge {
    position: absolute;
    top: -4px;
    right: 12px;
    background: var(--color-accent);
    color: white;
    font-size: 10px;
    font-weight: 700;
    height: 18px;
    min-width: 18px;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 4px;
}

/* Page Content */
.page-content {
    padding-top: var(--spacing-4);
    padding-bottom: 90px; /* Space for bottom nav */
    min-height: calc(100vh - 64px);
}

/* Footer (hidden on mobile) */
.footer {
    display: none;
}

/* Media Queries */
@media (min-width: 768px) {
    .container { padding: 0 var(--spacing-6); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1024px) {
    .container { padding: 0 var(--spacing-8); }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    
    .bottom-nav { display: none; }
    .desktop-nav { 
        display: flex; 
        align-items: center;
        gap: var(--spacing-6);
    }
    
    .desktop-nav a {
        color: var(--color-text-primary);
        font-weight: 500;
    }
    
    .desktop-nav a.active {
        color: var(--color-primary);
    }
    
    .page-content {
        padding-bottom: var(--spacing-10);
    }
    
    .footer {
        display: block;
        background: var(--color-surface);
        padding: var(--spacing-10) 0;
        margin-top: var(--spacing-10);
        border-top: 1px solid var(--color-border);
    }
}