.nsh-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 40;
    background: var(--nsh-theme-header-bg);
    border-bottom: 1px solid var(--nsh-theme-header-border);
    box-shadow: var(--nsh-theme-header-shadow);
    backdrop-filter: saturate(140%) blur(10px);
    -webkit-backdrop-filter: saturate(140%) blur(10px);
    transition: background-color var(--nsh-duration-base) ease, border-color var(--nsh-duration-base) ease, box-shadow var(--nsh-duration-base) ease, transform var(--nsh-duration-base) ease;
}

.nsh-header::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    height: 2px;
    pointer-events: none;
    transform-origin: left center;
    transform: scaleX(var(--nsh-scroll-progress, 0));
    background: linear-gradient(90deg, #1d4ed8 0%, #0284c7 56%, #f59e0b 100%);
    opacity: 0.85;
    transition: transform 0.22s ease;
}

.nsh-header.is-scrolled {
    background: var(--nsh-theme-header-bg-strong);
    box-shadow: var(--nsh-theme-header-shadow-strong);
}

.nsh-header .nsh-container {
    width: var(--nsh-header-container);
}

.nsh-header__bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    min-height: 76px;
    transition: min-height var(--nsh-duration-base) ease;
}

.nsh-header.is-scrolled .nsh-header__bar {
    min-height: 72px;
}

.nsh-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
    max-width: min(52%, 580px);
}

.nsh-brand__mark {
    width: 44px;
    aspect-ratio: 1 / 1;
    height: auto;
    border-radius: 999px;
    background: var(--nsh-primary);
    color: var(--nsh-theme-on-accent);
    overflow: hidden;
    flex-shrink: 0;
    transition: transform var(--nsh-duration-base) ease, box-shadow var(--nsh-duration-base) ease;
}

.nsh-header.is-scrolled .nsh-brand__mark {
    transform: scale(0.96);
    box-shadow: 0 8px 18px rgba(16, 42, 107, 0.22);
}

.nsh-brand__logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
}

.nsh-brand__copy {
    min-width: 0;
    display: grid;
    gap: 3px;
}

.nsh-brand__copy strong {
    color: var(--nsh-primary);
    font-size: clamp(0.98rem, 1.08vw, 1.12rem);
    font-weight: 700;
    line-height: 1.15;
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
    max-width: 34ch;
}

.nsh-brand__copy small {
    color: var(--nsh-warm);
    font-size: clamp(0.84rem, 0.84vw, 0.95rem);
    line-height: 1.2;
    max-width: 36ch;
}

.nsh-nav {
    margin-left: auto;
    flex: 0 1 auto;
}

.nsh-nav__list {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 4px;
}

.nsh-nav__item {
    position: relative;
}

.nsh-nav__compound {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    min-height: 40px;
    padding: 0 4px 0 2px;
    border-radius: 12px;
    color: var(--nsh-primary);
    transition: background-color var(--nsh-duration-slow) ease, color var(--nsh-duration-slow) ease, box-shadow var(--nsh-duration-slow) ease;
}

.nsh-nav__item.has-children:hover .nsh-nav__compound,
.nsh-nav__item.has-children.is-open .nsh-nav__compound,
.nsh-nav__item.has-children .nsh-nav__compound.is-current {
    background: var(--nsh-theme-nav-hover-bg);
    color: var(--nsh-primary);
}

.nsh-nav__link {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
    padding: 0 12px;
    border-radius: 10px;
    color: var(--nsh-primary);
    font-size: 0.86rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    transition: background-color var(--nsh-duration-slow) ease, color var(--nsh-duration-slow) ease;
}

.nsh-nav__item.has-children .nsh-nav__link {
    min-height: auto;
    padding: 0 10px 0 12px;
    color: inherit;
    background: transparent;
}

.nsh-nav__link:hover,
.nsh-nav__link.is-active {
    background: var(--nsh-theme-nav-hover-bg);
    color: var(--nsh-primary);
}

.nsh-nav__item.has-children .nsh-nav__link:hover,
.nsh-nav__item.has-children .nsh-nav__link.is-active {
    background: transparent;
    color: inherit;
}

.nsh-nav__toggle {
    width: 30px;
    height: 30px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: inherit;
    cursor: pointer;
    display: inline-grid;
    place-items: center;
    transition: background-color var(--nsh-duration-slow) ease, color var(--nsh-duration-slow) ease;
}

.nsh-nav__toggle:hover {
    background: var(--nsh-theme-nav-toggle-hover-bg);
}

.nsh-nav__dropdown {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    min-width: 220px;
    padding: 10px;
    display: grid;
    gap: 6px;
    background: var(--nsh-surface);
    border-radius: 14px;
    border: 1px solid var(--nsh-line);
    box-shadow: var(--nsh-shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(6px);
    transition: opacity var(--nsh-duration-slow) ease 0.08s, transform var(--nsh-duration-slow) ease 0.08s;
}

.nsh-nav__item:hover .nsh-nav__dropdown,
.nsh-nav__item.is-open .nsh-nav__dropdown {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.nsh-nav__dropdown-link {
    padding: 9px 11px;
    border-radius: 10px;
    color: var(--nsh-copy);
    font-size: 0.86rem;
    font-weight: 600;
    line-height: 1.35;
    letter-spacing: 0.01em;
    transition: background-color var(--nsh-duration-slow) ease, color var(--nsh-duration-slow) ease;
}

.nsh-nav__dropdown-link:hover {
    background: var(--nsh-theme-nav-hover-bg);
    color: var(--nsh-primary);
}

.nsh-header__actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nsh-header__actions .nsh-btn {
    min-height: 42px;
    padding: 0 18px;
    font-size: 0.88rem;
    white-space: nowrap;
    flex-shrink: 0;
}

.nsh-menu-toggle,
.nsh-mobile-close {
    display: none;
}

@media (max-width: 1080px) {
    .nsh-header .nsh-container {
        width: min(1220px, calc(100vw - 24px));
    }

    .nsh-nav,
    .nsh-header__actions .nsh-btn {
        display: none;
    }

    .nsh-menu-toggle,
    .nsh-mobile-close {
        display: inline-block;
    }

    .nsh-header__bar {
        min-height: 72px;
    }

    .nsh-brand {
        max-width: min(88vw, 560px);
    }
}

@media (max-width: 720px) {
    .nsh-header__bar {
        min-height: 68px;
        gap: 10px;
    }

    .nsh-brand {
        max-width: min(88vw, 420px);
    }

    .nsh-brand__copy small {
        display: none;
    }
}


/* SLTP stage 5: header/nav micro-interactions */
.nsh-nav__item.has-children:hover .nsh-nav__compound,
.nsh-nav__item.has-children.is-open .nsh-nav__compound,
.nsh-nav__item.has-children .nsh-nav__compound.is-current {
    box-shadow: 0 8px 18px rgba(16, 42, 107, 0.12);
}

.nsh-nav__link {
    position: relative;
}

.nsh-nav__link::after {
    content: "";
    position: absolute;
    left: 12px;
    right: 12px;
    bottom: 7px;
    height: 2px;
    border-radius: 999px;
    transform-origin: center;
    transform: scaleX(0);
    opacity: 0;
    background: linear-gradient(90deg, #1d4ed8 0%, #0284c7 60%, #f59e0b 100%);
    transition: transform 0.26s ease, opacity 0.26s ease;
}

.nsh-nav__item:not(.has-children) .nsh-nav__link:hover::after,
.nsh-nav__item:not(.has-children) .nsh-nav__link.is-active::after,
.nsh-nav__item.is-current:not(.has-children) .nsh-nav__link::after {
    transform: scaleX(1);
    opacity: 1;
}

.nsh-nav__dropdown {
    background: linear-gradient(170deg, rgba(255, 255, 255, 0.98), rgba(239, 246, 255, 0.94));
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.nsh-menu-toggle span,
.nsh-mobile-close span {
    transition: top var(--nsh-duration-fast) ease, transform var(--nsh-duration-fast) ease, opacity var(--nsh-duration-fast) ease;
}

body.nsh-menu-open .nsh-menu-toggle span:nth-child(1) {
    top: 23px;
    transform: rotate(45deg);
}

body.nsh-menu-open .nsh-menu-toggle span:nth-child(2) {
    opacity: 0;
}

body.nsh-menu-open .nsh-menu-toggle span:nth-child(3) {
    top: 23px;
    transform: rotate(-45deg);
}

.nsh-mobile-panel {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(239, 246, 255, 0.98));
    border-left: 1px solid rgba(29, 78, 216, 0.16);
}

.nsh-mobile-link,
.nsh-mobile-sublink {
    transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.nsh-mobile-link:hover,
.nsh-mobile-sublink:hover {
    transform: translateX(2px);
}

@media (prefers-reduced-motion: reduce) {
    .nsh-header,
    .nsh-header::after,
    .nsh-header__bar,
    .nsh-brand__mark,
    .nsh-nav__link,
    .nsh-nav__link::after,
    .nsh-nav__compound,
    .nsh-nav__dropdown,
    .nsh-mobile-panel,
    .nsh-menu-toggle span,
    .nsh-mobile-toggle,
    .nsh-mobile-link,
    .nsh-mobile-sublink {
        transition: none !important;
    }
}