.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-line);
}

.topbar {
    color: var(--color-white);
    background: var(--color-dark);
    font-size: 0.88rem;
}

.topbar__inner,
.header-main,
.main-nav__inner {
    display: flex;
    align-items: center;
}

.topbar__inner {
    justify-content: space-between;
    min-height: 34px;
    gap: 16px;
}

.header-main {
    min-height: 82px;
    gap: 24px;
}

.brand {
    display: inline-flex;
    align-items: center;
    flex: 0 0 auto;
    gap: 12px;
}

.brand__logo {
    display: block;
    width: auto;
    height: 52px;
    max-width: 260px;
    object-fit: contain;
}

.brand__logo:not([src]),
.brand__logo[src=""] {
    display: none;
}

.brand__fallback {
    display: none;
    align-items: center;
    gap: 12px;
}

.brand__mark {
    display: grid;
    width: 44px;
    height: 44px;
    place-items: center;
    border-radius: var(--radius);
    color: var(--color-white);
    background: var(--color-primary);
    font-weight: 800;
}

.brand__text {
    display: grid;
    gap: 2px;
}

.brand__text small {
    color: var(--color-muted);
    font-size: 0.78rem;
}

.search-form {
    display: flex;
    flex: 1;
    min-width: 220px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--color-white);
}

.search-form input {
    width: 100%;
    min-height: 44px;
    border: 0;
    padding: 0 14px;
    font: inherit;
    outline: none;
}

.search-form button,
.header-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border: 0;
    padding: 0 18px;
    color: var(--color-white);
    background: var(--color-primary);
    font-weight: 700;
    cursor: pointer;
}

.header-action {
    border-radius: var(--radius);
    white-space: nowrap;
}

.main-nav {
    border-top: 1px solid var(--color-line);
}

.main-nav__inner {
    min-height: 46px;
    gap: 24px;
    overflow-x: auto;
}

.main-nav a {
    color: var(--color-muted);
    font-weight: 700;
    white-space: nowrap;
}

.main-nav a:hover {
    color: var(--color-primary);
}

@media (max-width: 820px) {
    .header-main {
        align-items: stretch;
        flex-direction: column;
        padding: 14px 0;
        gap: 14px;
    }

    .brand__logo {
        height: 46px;
        max-width: 230px;
    }

    .topbar__inner {
        align-items: flex-start;
        flex-direction: column;
        justify-content: center;
        padding: 8px 0;
    }
}