header {
    height: 80px;
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: background 0.3s ease;
}

header.scrolled {
    background: var(--background);
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    background: var(--secondary);
    padding: 0 0.5rem;
}

footer {
    background: var(--secondary);
    color: var(--primary);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.grid-asymmetric {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-md);
}