.header {
    position: sticky;
    top: 0;
    z-index: 40;
    background: rgba(11, 18, 32, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border, #374151);
}

.header__inner {
    max-width: 1360px;
    margin: 0 auto;
    padding: 10px 20px;
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
    position: relative;
}

.header__group {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.header__group-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 9px 14px;
    border-radius: 12px;
    border: 1px solid var(--border, #374151);
    background: var(--surface, #111827);
    color: var(--text, #e5e7eb);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    cursor: pointer;
    transition: 0.15s ease;
}

.header__group-button:hover,
.header__group-button:focus-visible,
.header__group.is-active .header__group-button {
    border-color: var(--border-soft, #4b5563);
    background: var(--surface-soft, #1f2937);
    outline: none;
}

.header__group-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 240px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 10px;
    border-radius: 12px;
    border: 1px solid var(--border, #374151);
    background: var(--surface, #111827);
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.12);
    z-index: 50;
}

.header__group-menu.is-open,
.header__group:hover .header__group-menu,
.header__group:focus-within .header__group-menu {
    display: flex;
}

.header__link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 9px 14px;
    border-radius: 10px;
    border: 1px solid var(--border, #374151);
    background: var(--surface, #111827);
    color: var(--text, #e5e7eb);
    text-decoration: none;
    font-weight: 700;
    transition: 0.15s ease;
}

.header__link:hover {
    border-color: var(--border-soft, #4b5563);
    background: var(--surface-soft, #1f2937);
    transform: translateY(-1px);
}

.header__link.is-active {
    border-color: var(--primary, #3b82f6);
    background: var(--primary-soft, #1e3a8a);
    color: #bfdbfe;
}