/*
|--------------------------------------------------------------------------
| VABCORE Header and Navigation Polish
|--------------------------------------------------------------------------
|
| Enhances the existing site header, desktop navigation and mobile menu
| without changing the current HTML structure.
|
*/

/*
|--------------------------------------------------------------------------
| Header Foundation
|--------------------------------------------------------------------------
*/

.site-header {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: var(--z-header);
    width: 100%;
    border-bottom: 1px solid transparent;
    background: transparent;
    transition:
        background-color var(--transition-base),
        border-color var(--transition-base),
        box-shadow var(--transition-base),
        backdrop-filter var(--transition-base),
        transform var(--transition-base);
}

.site-header::before {
    position: absolute;
    inset: 0;
    z-index: -1;
    background:
        linear-gradient(
            180deg,
            rgba(5, 17, 38, 0.34),
            rgba(5, 17, 38, 0.08)
        );
    content: "";
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.site-header.is-scrolled {
    border-bottom-color: rgba(255, 255, 255, 0.09);
    background: rgba(5, 17, 38, 0.76);
    box-shadow:
        0 14px 38px rgba(0, 0, 0, 0.16),
        inset 0 1px 0 rgba(255, 255, 255, 0.035);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.site-header.is-scrolled::before {
    opacity: 1;
}

.site-header.is-hidden {
    transform: translateY(-105%);
}

/*
|--------------------------------------------------------------------------
| Navbar
|--------------------------------------------------------------------------
*/

.navbar {
    position: relative;
    display: flex;
    min-height: var(--header-height);
    align-items: center;
    justify-content: space-between;
    gap: 30px;
    transition:
        min-height var(--transition-base),
        padding var(--transition-base);
}

.site-header.is-scrolled .navbar {
    min-height: 76px;
}

/*
|--------------------------------------------------------------------------
| Brand Polish
|--------------------------------------------------------------------------
*/

.brand {
    position: relative;
    display: inline-flex;
    min-width: 0;
    align-items: center;
    gap: 13px;
    color: var(--color-white);
    isolation: isolate;
}

.brand::before {
    position: absolute;
    inset: -9px -12px;
    z-index: -1;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.055);
    content: "";
    opacity: 0;
    transform: scale(0.94);
    transition:
        opacity var(--transition-base),
        transform var(--transition-smooth);
}

.brand:hover::before,
.brand:focus-visible::before {
    opacity: 1;
    transform: scale(1);
}

.brand-mark {
    position: relative;
    display: grid;
    width: 50px;
    height: 50px;
    flex: 0 0 50px;
    place-items: center;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 15px;
    background:
        linear-gradient(
            145deg,
            rgba(255, 255, 255, 0.14),
            rgba(255, 255, 255, 0.055)
        );
    box-shadow:
        0 12px 30px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.12);
    color: var(--color-white);
    font-family: var(--font-heading);
    font-size: 1.42rem;
    font-weight: var(--font-weight-extrabold);
    transition:
        background var(--transition-base),
        border-color var(--transition-base),
        box-shadow var(--transition-base),
        transform var(--transition-bounce);
}

.brand-mark::after {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(
            120deg,
            transparent 18%,
            rgba(255, 255, 255, 0.3) 48%,
            transparent 78%
        );
    content: "";
    transform: translateX(-130%);
    transition: transform 700ms ease;
}

.brand:hover .brand-mark {
    border-color: rgba(34, 199, 255, 0.42);
    background:
        linear-gradient(
            145deg,
            rgba(15, 111, 255, 0.5),
            rgba(34, 199, 255, 0.15)
        );
    box-shadow:
        0 16px 36px rgba(0, 0, 0, 0.24),
        var(--glow-accent-soft);
    transform: rotate(-3deg) scale(1.035);
}

.brand:hover .brand-mark::after {
    transform: translateX(130%);
}

.brand-text {
    display: flex;
    min-width: 0;
    flex-direction: column;
}

.brand-text strong {
    color: var(--color-white);
    font-family: var(--font-heading);
    font-size: 1.13rem;
    font-weight: var(--font-weight-extrabold);
    line-height: 1.08;
    letter-spacing: 0.025em;
}

.brand-text small {
    margin-top: 3px;
    color: #9eb1c8;
    font-size: 0.61rem;
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}

/*
|--------------------------------------------------------------------------
| Desktop Navigation
|--------------------------------------------------------------------------
*/

.nav-wrapper {
    display: flex;
    min-width: 0;
    align-items: center;
    gap: 28px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 29px;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    position: relative;
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    padding: 8px 0;
    color: rgba(255, 255, 255, 0.78);
    font-family: var(--font-heading);
    font-size: 0.84rem;
    font-weight: var(--font-weight-semibold);
    transition:
        color var(--transition-base),
        text-shadow var(--transition-base),
        transform var(--transition-base);
}

.nav-menu a::before {
    position: absolute;
    right: 50%;
    bottom: 3px;
    left: 50%;
    height: 2px;
    border-radius: var(--radius-pill);
    background:
        linear-gradient(
            90deg,
            var(--color-primary-light),
            var(--color-accent)
        );
    box-shadow: 0 0 12px rgba(34, 199, 255, 0.35);
    content: "";
    opacity: 0;
    transition:
        right var(--transition-smooth),
        left var(--transition-smooth),
        opacity var(--transition-base);
}

.nav-menu a:hover,
.nav-menu a:focus-visible,
.nav-menu a.active,
.nav-menu a[aria-current="page"] {
    color: var(--color-white);
    text-shadow: 0 0 18px rgba(34, 199, 255, 0.2);
    transform: translateY(-1px);
}

.nav-menu a:hover::before,
.nav-menu a:focus-visible::before,
.nav-menu a.active::before,
.nav-menu a[aria-current="page"]::before {
    right: 0;
    left: 0;
    opacity: 1;
}

.nav-menu a:focus-visible {
    border-radius: 8px;
    outline: none;
    box-shadow: var(--focus-ring-accent);
}

/*
|--------------------------------------------------------------------------
| Header CTA
|--------------------------------------------------------------------------
*/

.nav-cta {
    min-height: 46px;
    padding: 11px 22px;
    box-shadow:
        0 12px 28px rgba(15, 111, 255, 0.25);
    white-space: nowrap;
}

.nav-cta:hover {
    box-shadow:
        0 18px 38px rgba(15, 111, 255, 0.36),
        var(--glow-accent-soft);
}

/*
|--------------------------------------------------------------------------
| Mobile Navigation Toggle
|--------------------------------------------------------------------------
*/

.nav-toggle {
    position: relative;
    display: none;
    width: 47px;
    height: 47px;
    padding: 0;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.075);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.08);
    color: var(--color-white);
    cursor: pointer;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition:
        background var(--transition-base),
        border-color var(--transition-base),
        box-shadow var(--transition-base),
        transform var(--transition-base);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
    border-color: rgba(34, 199, 255, 0.4);
    background: rgba(34, 199, 255, 0.12);
    box-shadow: var(--glow-accent-soft);
}

.nav-toggle:active {
    transform: scale(0.96);
}

.nav-toggle:focus-visible {
    outline: none;
    box-shadow:
        var(--glow-accent-soft),
        var(--focus-ring-accent);
}

.nav-toggle i {
    font-size: 1.15rem;
    transition:
        opacity var(--transition-fast),
        transform var(--transition-smooth);
}

.nav-toggle[aria-expanded="true"] i {
    transform: rotate(90deg);
}

/*
|--------------------------------------------------------------------------
| Mobile Navigation
|--------------------------------------------------------------------------
*/

@media (max-width: 860px) {
    .site-header {
        background: rgba(5, 17, 38, 0.72);
        border-bottom-color: rgba(255, 255, 255, 0.07);
        backdrop-filter: blur(18px);
        -webkit-backdrop-filter: blur(18px);
    }

    .navbar,
    .site-header.is-scrolled .navbar {
        min-height: var(--header-height-mobile);
    }

    .nav-toggle {
        display: grid;
        place-items: center;
    }

    .nav-wrapper {
        position: fixed;
        top: calc(var(--header-height-mobile) + 10px);
        right: 18px;
        left: 18px;
        display: block;
        max-height: 0;
        overflow: hidden;
        padding: 0 18px;
        border: 1px solid rgba(255, 255, 255, 0);
        border-radius: 22px;
        background:
            linear-gradient(
                145deg,
                rgba(7, 22, 47, 0.98),
                rgba(8, 39, 83, 0.97)
            );
        box-shadow:
            0 30px 80px rgba(0, 0, 0, 0.34),
            inset 0 1px 0 rgba(255, 255, 255, 0.06);
        visibility: hidden;
        opacity: 0;
        transform: translateY(-15px) scale(0.98);
        transform-origin: top center;
        backdrop-filter: blur(24px);
        -webkit-backdrop-filter: blur(24px);
        transition:
            max-height 500ms ease,
            padding 500ms ease,
            border-color var(--transition-base),
            visibility 0s linear 500ms,
            opacity var(--transition-base),
            transform var(--transition-smooth);
    }

    .nav-wrapper.open {
        max-height: calc(100vh - 110px);
        overflow-y: auto;
        padding: 18px;
        border-color: rgba(255, 255, 255, 0.12);
        visibility: visible;
        opacity: 1;
        transform: translateY(0) scale(1);
        transition-delay: 0s;
    }

    .nav-menu {
        display: grid;
        gap: 5px;
    }

    .nav-menu li {
        margin: 0 !important;
        opacity: 0;
        transform: translateY(-8px);
        transition:
            opacity var(--transition-base),
            transform var(--transition-smooth);
    }

    .nav-wrapper.open .nav-menu li {
        opacity: 1;
        transform: translateY(0);
    }

    .nav-wrapper.open .nav-menu li:nth-child(1) {
        transition-delay: 60ms;
    }

    .nav-wrapper.open .nav-menu li:nth-child(2) {
        transition-delay: 100ms;
    }

    .nav-wrapper.open .nav-menu li:nth-child(3) {
        transition-delay: 140ms;
    }

    .nav-wrapper.open .nav-menu li:nth-child(4) {
        transition-delay: 180ms;
    }

    .nav-wrapper.open .nav-menu li:nth-child(5) {
        transition-delay: 220ms;
    }

    .nav-wrapper.open .nav-menu li:nth-child(6) {
        transition-delay: 260ms;
    }

    .nav-menu a,
    .site-header .nav-menu a {
        display: flex;
        min-height: 48px;
        justify-content: flex-start;
        padding: 12px 14px;
        border: 1px solid transparent;
        border-radius: 13px;
        color: #c9d5e5;
        font-size: 0.91rem;
        transform: none;
    }

    .nav-menu a::before {
        top: 50%;
        right: auto;
        bottom: auto;
        left: 0;
        width: 3px;
        height: 20px;
        opacity: 0;
        transform: translateY(-50%) scaleY(0.45);
        transition:
            opacity var(--transition-base),
            transform var(--transition-smooth);
    }

    .nav-menu a:hover,
    .nav-menu a:focus-visible,
    .nav-menu a.active,
    .nav-menu a[aria-current="page"] {
        border-color: rgba(34, 199, 255, 0.12);
        background: rgba(34, 199, 255, 0.09);
        color: var(--color-white);
        transform: none;
    }

    .nav-menu a:hover::before,
    .nav-menu a:focus-visible::before,
    .nav-menu a.active::before,
    .nav-menu a[aria-current="page"]::before {
        right: auto;
        left: 0;
        opacity: 1;
        transform: translateY(-50%) scaleY(1);
    }

    .nav-wrapper .nav-cta {
        display: flex;
        width: 100%;
        margin-top: 13px;
    }

    body.mobile-menu-open {
        overflow: hidden;
    }

    body.mobile-menu-open::after {
        position: fixed;
        inset: 0;
        z-index: calc(var(--z-header) - 1);
        background: rgba(2, 9, 21, 0.52);
        content: "";
        backdrop-filter: blur(3px);
        -webkit-backdrop-filter: blur(3px);
    }
}

/*
|--------------------------------------------------------------------------
| Small Mobile
|--------------------------------------------------------------------------
*/

@media (max-width: 420px) {
    .brand {
        gap: 10px;
    }

    .brand-mark {
        width: 44px;
        height: 44px;
        flex-basis: 44px;
        border-radius: 13px;
        font-size: 1.24rem;
    }

    .brand-text strong {
        font-size: 1rem;
    }

    .brand-text small {
        font-size: 0.53rem;
        letter-spacing: 0.1em;
    }

    .nav-toggle {
        width: 44px;
        height: 44px;
    }

    .nav-wrapper {
        right: 12px;
        left: 12px;
    }
}

/*
|--------------------------------------------------------------------------
| Touch Devices
|--------------------------------------------------------------------------
*/

@media (hover: none) {
    .brand:hover .brand-mark,
    .nav-menu a:hover {
        transform: none;
    }
}

/*
|--------------------------------------------------------------------------
| Reduced Motion
|--------------------------------------------------------------------------
*/

@media (prefers-reduced-motion: reduce) {
    .site-header,
    .site-header::before,
    .navbar,
    .brand::before,
    .brand-mark,
    .brand-mark::after,
    .nav-menu a,
    .nav-menu a::before,
    .nav-toggle,
    .nav-toggle i,
    .nav-wrapper,
    .nav-menu li {
        transition: none !important;
    }

    .brand:hover .brand-mark,
    .nav-menu a:hover,
    .site-header.is-hidden {
        transform: none;
    }
}