.site-header {
    position: sticky;
    top: 0;
    z-index: var(--k-z-sticky);
    border-bottom: 1px solid rgba(216, 224, 230, .78);
    background: rgba(255, 255, 255, .88);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    transition: box-shadow var(--k-duration-normal) var(--k-ease-standard);
}
.site-header.is-scrolled { box-shadow: 0 8px 30px rgba(14, 28, 40, .055); }
.site-header__inner {
    min-height: var(--k-header-height);
    display: grid;
    grid-template-columns: minmax(170px, 220px) 1fr auto;
    align-items: center;
    gap: clamp(1rem, 2.4vw, 2rem);
}
.site-brand { display: inline-flex; align-items: center; text-decoration: none; }
.site-brand img { display: block; width: min(100%, 205px); height: auto; }
.desktop-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: clamp(.8rem, 1.6vw, 1.45rem);
}
.desktop-nav a, .header-login {
    position: relative;
    color: var(--k-ink-700);
    font-size: .86rem;
    font-weight: var(--k-weight-medium);
    text-decoration: none;
    white-space: nowrap;
}
.desktop-nav a::after, .header-login::after {
    content: "";
    position: absolute;
    left: 0; right: 100%; bottom: -.55rem;
    height: 1px;
    background: var(--k-blue-500);
    transition: right var(--k-duration-normal) var(--k-ease-standard);
}
.desktop-nav a:hover, .header-login:hover { color: var(--k-ink-950); }
.desktop-nav a:hover::after, .header-login:hover::after { right: 0; }
.site-header__actions { display: flex; align-items: center; gap: .75rem; }
.language-control { display: grid; gap: .35rem; color: var(--k-text-secondary); font-size: var(--k-text-xs); }
.language-select {
    min-height: 38px;
    max-width: 148px;
    border: 1px solid var(--k-border);
    border-radius: var(--k-radius-pill);
    background: var(--k-white);
    color: var(--k-ink-700);
    padding: .45rem 2rem .45rem .75rem;
}
.language-select:focus-visible { outline: 3px solid var(--k-focus); outline-offset: 2px; }
.mobile-menu-button {
    display: none;
    width: 42px; height: 42px;
    border: 1px solid var(--k-border);
    border-radius: 50%;
    background: var(--k-white);
    align-items: center; justify-content: center; flex-direction: column;
    gap: 4px; cursor: pointer;
}
.mobile-menu-button span { width: 17px; height: 1.5px; background: var(--k-ink-900); transition: transform .2s ease, opacity .2s ease; }
.mobile-menu-button[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.mobile-menu-button[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.mobile-menu-button[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }
.mobile-navigation {
    border-top: 1px solid var(--k-border);
    background: rgba(255,255,255,.98);
}
.mobile-navigation__inner { padding-block: 1rem 1.4rem; display: grid; gap: .2rem; }
.mobile-navigation a {
    padding: .78rem .2rem;
    color: var(--k-ink-900);
    font-weight: var(--k-weight-medium);
    text-decoration: none;
}
.mobile-navigation__separator { height: 1px; background: var(--k-border); margin: .6rem 0; }

@media (max-width: 1120px) {
    .site-header__inner { grid-template-columns: minmax(150px, 190px) 1fr auto; }
    .desktop-nav { gap: .85rem; }
    .desktop-nav a { font-size: .8rem; }
    .language-control--desktop { display: none; }
}
@media (max-width: 880px) {
    .site-header__inner { display: flex; justify-content: space-between; }
    .desktop-nav, .header-login, .header-demo { display: none; }
    .mobile-menu-button { display: flex; }
    .site-brand img { width: 178px; }
}
@media (max-width: 430px) {
    .site-brand img { width: 155px; }
}

.site-header{padding-top:env(safe-area-inset-top)}
.mobile-navigation{overscroll-behavior:contain}
.mobile-menu-button{min-width:44px;min-height:44px}