.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.92);
    -webkit-backdrop-filter: blur(24px);
    backdrop-filter: blur(24px);
    border-top: 4px solid #2b3342;
    height: var(--header-height);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.08);
    transition: background-color var(--transition-speed);
}

.site-header.is-dropdown-visible {
    background-color: var(--color-white);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
    height: var(--header-height);
    padding: 0 var(--container-padding);
    box-sizing: border-box;
}

.header-logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    margin-right: 1rem;
}

.header-logo-img {
    width: 250px;
    height: 46px;
    object-fit: contain;
    object-position: left center;
}

.header-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    min-width: 0;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    height: var(--header-height);
}

.nav-link {
    display: flex;
    align-items: center;
    height: var(--header-height);
    padding: 0 12px;
    font-size: 16px;
    font-weight: 500;
    line-height: 24px;
    color: var(--color-text);
    white-space: nowrap;
    transition: color var(--transition-speed);
}

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

.nav-item--button .nav-link {
    color: var(--color-text);
}

.nav-item--button.is-active .nav-link,
.nav-item--button .nav-link[aria-current="page"],
.nav-item--dropdown.is-section-active .nav-link {
    color: var(--color-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
    margin-left: auto;
    justify-content: flex-end;
}

.header-action {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    transition: color var(--transition-speed), background-color var(--transition-speed);
}

.header-action--eportal {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    background-color: var(--color-primary);
    border-radius: 50%;
    color: var(--color-white);
}

.header-action--eportal:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
}

.header-action--eportal img {
    width: 24px;
    height: 24px;
    display: block;
}

.header-action--icon {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    border-radius: 50%;
    background-color: transparent;
}

.header-action--icon img {
    width: 24px;
    height: 24px;
    display: block;
}

.header-action--icon:hover {
    background-color: rgba(0, 0, 0, 0.04);
}

.header-mobile-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 8px;
}

.hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    transition: transform var(--transition-speed), opacity var(--transition-speed);
}

.header-mobile-toggle.is-active .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.header-mobile-toggle.is-active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.header-mobile-toggle.is-active .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 1200px) {
    .nav-link {
        padding: 0 8px;
        font-size: 15px;
    }
}

@media (max-width: 1050px) {
    .header-logo-img {
        width: 210px;
        height: 39px;
    }

    .nav-link {
        padding: 0 6px;
        font-size: 14px;
    }
}

@media (max-width: 900px) {
    .header-logo {
        width: auto;
    }

    .header-actions {
        width: auto;
    }

    .header-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: var(--color-white);
        box-shadow: var(--shadow-md);
        padding: 1.5rem;
        transform: translateY(-120%);
        opacity: 0;
        visibility: hidden;
        transition: transform var(--transition-speed), opacity var(--transition-speed), visibility var(--transition-speed);
    }

    .header-nav.is-open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
    }

    .nav-item {
        height: auto;
        width: 100%;
    }

    .nav-link {
        height: auto;
        padding: 0.75rem 0;
        font-size: 16px;
        width: 100%;
    }

    .header-mobile-toggle {
        display: flex;
    }

    .header-action--icon {
        display: none;
    }

    .header-logo-img {
        width: 180px;
        height: 33px;
    }
}

@media (max-width: 480px) {
    .header-logo-img {
        width: 160px;
        height: 30px;
    }

    .header-action--eportal {
        width: 40px;
        height: 40px;
    }
}