.bv-header {
    position: sticky;
    top: 0;
    z-index: 30;
    /* Solid background, not translucent+backdrop-filter: filter/backdrop-filter on this
       ancestor would establish a new containing block for the position:fixed mobile menu
       panel below, sizing it to the header's own ~64px height instead of the viewport. */
    background: var(--bv-surface);
    border-bottom: 1px solid var(--bv-border);
}

.bv-header__inner {
    max-width: var(--bv-max-width);
    margin: 0 auto;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.bv-header__brand {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-width: 0;
    flex: 1;
}

.bv-logo {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    line-height: 1.2;
    min-width: 0;
}

.bv-logo__full {
    font-weight: 800;
    font-size: 1.05rem;
    letter-spacing: 0.02em;
    color: var(--bv-primary-dark);
}

.bv-logo__short {
    display: none;
    font-weight: 800;
    font-size: 1.05rem;
    color: var(--bv-primary-dark);
}

.bv-logo__tagline {
    font-size: 0.75rem;
    color: var(--bv-text-muted);
}

.bv-menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    border: 1px solid var(--bv-border);
    border-radius: var(--bv-radius-sm);
    background: var(--bv-surface);
    cursor: pointer;
}

.bv-menu-toggle span {
    width: 18px;
    height: 2px;
    background: var(--bv-primary-dark);
    border-radius: 999px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.bv-menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.bv-menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.bv-menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.bv-header__menu {
    display: flex;
    align-items: center;
    gap: 20px;
    flex: 2;
    justify-content: flex-end;
    flex-wrap: wrap;
}

.bv-nav {
    display: flex;
    align-items: center;
    gap: 18px;
    flex-wrap: wrap;
}

.bv-nav a {
    text-decoration: none;
    color: var(--bv-text);
    font-weight: 500;
    font-size: 0.92rem;
    white-space: nowrap;
}

.bv-nav a:hover, .bv-nav a[aria-current="page"] {
    color: var(--bv-primary-dark);
}

.bv-header__search {
    position: relative;
    display: flex;
    align-items: center;
    gap: 4px;
    background: var(--bv-background);
    border: 1px solid var(--bv-border);
    border-radius: 999px;
    padding: 4px 4px 4px 14px;
}

.bv-header__search input {
    border: 0;
    background: transparent;
    outline: none;
    width: 200px;
    min-height: 36px;
}

.bv-header__search button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: var(--bv-primary);
    color: #fff;
    cursor: pointer;
}

.bv-header__cta {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding: 0 18px;
    border-radius: var(--bv-radius-sm);
    background: var(--bv-primary);
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    white-space: nowrap;
}

.bv-header__cta:hover {
    background: var(--bv-primary-dark);
}

@media (max-width: 960px) {
    .bv-logo__full { display: none; }
    .bv-logo__short { display: block; }
    .bv-logo__tagline { display: none; }

    .bv-menu-toggle { display: flex; }

    .bv-header__menu {
        position: fixed;
        top: 64px;
        right: 0;
        bottom: 0;
        left: 0;
        z-index: 40;
        background: var(--bv-surface);
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        padding: 20px 16px 32px;
        gap: 16px;
        overflow-y: auto;
        border-top: 1px solid var(--bv-border);
    }

    .bv-header__menu[hidden] { display: none; }

    .bv-nav {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
    }

    .bv-nav a {
        padding: 12px 8px;
        border-bottom: 1px solid var(--bv-border);
    }

    .bv-header__search input { width: 100%; flex: 1; }
}