.ivf-header {
    position: relative;
    z-index: 100;

    min-height: var(--ivf-header-height);

    display: flex;
    align-items: center;

    background: rgba(255, 255, 255, 0.98);

    border-bottom: 1px solid rgba(226, 232, 240, 0.85);
}

.ivf-header-inner {
    min-height: var(--ivf-header-height);

    display: flex;
    align-items: center;
    gap: 24px;
}

.ivf-brand {
    flex: 0 0 auto;

    display: inline-flex;
    align-items: center;
    gap: 11px;
}

.ivf-brand-mark {
    position: relative;

    width: 38px;
    height: 42px;

    flex: 0 0 38px;
}

.ivf-cross-v,
.ivf-cross-h {
    position: absolute;
    display: block;

    background: var(--ivf-blue);
    border-radius: 2px;
}

.ivf-cross-v {
    width: 7px;
    height: 38px;

    top: 2px;
    left: 15px;
}

.ivf-cross-h {
    width: 30px;
    height: 7px;

    top: 11px;
    left: 4px;
}

.ivf-brand-text {
    display: flex;
    flex-direction: column;

    line-height: 1.1;
}

.ivf-brand-text strong {
    color: var(--ivf-blue);

    font-size: 1rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.ivf-brand-text small {
    margin-top: 5px;

    color: var(--ivf-muted);

    font-size: 0.72rem;
    font-weight: 500;
}

.ivf-nav {
    margin-left: auto;

    display: flex;
    align-items: center;
    gap: 20px;
}

.ivf-nav-link {
    position: relative;

    padding: 30px 0 27px;

    color: #3e4b5f;

    font-size: 0.87rem;
    font-weight: 650;

    white-space: nowrap;

    transition: color var(--ivf-transition);
}

.ivf-nav-link:hover,
.ivf-nav-link.is-active {
    color: var(--ivf-blue);
}

.ivf-nav-link.is-active::after {
    content: "";

    position: absolute;

    left: 0;
    right: 0;
    bottom: 20px;

    height: 2px;

    background: var(--ivf-blue);
    border-radius: 2px;
}

.ivf-header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ivf-header-actions .ivf-button {
    min-height: 40px;

    padding: 9px 14px;

    font-size: 0.82rem;
}

.ivf-menu-toggle {
    display: none;

    width: 44px;
    height: 44px;

    padding: 9px;

    border: 0;
    border-radius: 8px;

    background: transparent;

    cursor: pointer;
}

.ivf-menu-toggle span {
    display: block;

    width: 25px;
    height: 2px;

    margin: 5px auto;

    background: var(--ivf-text);

    border-radius: 10px;

    transition:
        transform var(--ivf-transition),
        opacity var(--ivf-transition);
}