@media (max-width: 768px) {
    .header-container {
        min-height: 72px;
    }

    .brand img {
        width: 46px;
    }

    .brand span {
        font-size: 1.2rem;
    }

    .menu-toggle {
        display: block;
    }

    .site-nav {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: var(--color-white);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow);
    }

    .site-nav.is-open {
        display: flex;
    }

    .site-nav a {
        padding: 16px 24px;
        border-top: 1px solid var(--color-border);
    }

    .nav-button {
        margin: 16px 24px 20px;
        text-align: center;
    }
}
@media (max-width: 900px) {
    .feature-grid {
        grid-template-columns: 1fr;
    }
}