/* ============================================================
   Shared Navigation
   Single source of truth for the site header on every page.
   ============================================================ */

:root {
    --site-nav-top: calc(env(safe-area-inset-top, 0px) + 0.75rem);
    --site-nav-edge: max(1rem, calc((100vw - 1280px) / 2));
    --site-nav-height: 80px;
    --site-nav-bg: linear-gradient(180deg, rgba(7, 13, 34, 0.9), rgba(5, 9, 29, 0.8));
    --site-nav-border: rgba(132, 149, 255, 0.16);
}

.site-nav {
    position: fixed;
    top: var(--site-nav-top);
    left: var(--site-nav-edge);
    right: var(--site-nav-edge);
    z-index: 10050;
    display: grid;
    grid-template-columns: 56px minmax(0, 1fr) 56px;
    align-items: center;
    min-height: 80px;
    padding: 0.8rem 1.35rem;
    transition: min-height 0.25s ease, padding 0.25s ease;
}

.site-nav::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 0;
    border: 1px solid var(--site-nav-border);
    border-radius: 24px;
    background: var(--site-nav-bg);
    box-shadow: 0 18px 55px rgba(0, 0, 0, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(24px) saturate(1.35);
    -webkit-backdrop-filter: blur(24px) saturate(1.35);
    transition: background 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease, opacity 0.22s ease;
}

.site-nav.site-nav--scrolled {
    min-height: 72px;
    padding-top: 0.65rem;
    padding-bottom: 0.65rem;
}

.site-nav.site-nav--scrolled::before {
    border-color: rgba(132, 149, 255, 0.2);
    background: linear-gradient(180deg, rgba(8, 14, 38, 0.96), rgba(5, 9, 29, 0.92));
    box-shadow: 0 14px 46px rgba(0, 0, 0, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.site-nav__brand {
    position: relative;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    justify-self: start;
    text-decoration: none;
}

.site-nav__logo {
    width: 45px;
    height: 45px;
    border-radius: 10px;
    object-fit: cover;
    transition: transform 0.25s ease;
}

.site-nav__brand:hover .site-nav__logo {
    transform: scale(1.08) rotate(4deg);
}

.site-nav__menu {
    display: flex;
    align-items: center;
    justify-content: center;
    justify-self: center;
    gap: clamp(1.1rem, 2vw, 2.35rem);
    min-width: 0;
    position: relative;
    z-index: 2;
}

.site-nav__link {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0.45rem 0.75rem;
    color: var(--light-text, #e5e7eb);
    font-size: 1rem;
    font-weight: 700;
    line-height: 1;
    text-decoration: none;
    white-space: nowrap;
    transition: color 0.2s ease, text-shadow 0.2s ease;
}

.site-nav__link span {
    position: relative;
    z-index: 1;
}

.site-nav__link::before {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0.25rem;
    width: 100%;
    height: 2px;
    border-radius: 999px;
    background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
    box-shadow: 0 0 12px rgba(250, 204, 21, 0.45);
    transform: translateX(-50%) scaleX(0);
    transition: transform 0.25s ease;
}

.site-nav__link:hover,
.site-nav__link:focus-visible,
.site-nav__link.is-active {
    color: var(--accent-gold, #facc15);
    text-shadow: 0 0 18px rgba(250, 204, 21, 0.28);
}

.site-nav__link:hover::before,
.site-nav__link:focus-visible::before,
.site-nav__link.is-active::before {
    transform: translateX(-50%) scaleX(1);
}

.site-nav__toggle {
    position: relative;
    z-index: 3;
    display: none;
    justify-self: end;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 0;
    border-radius: 12px;
    background: transparent;
    color: var(--accent-gold, #facc15);
    cursor: pointer;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.site-nav__toggle span {
    position: absolute;
    width: 25px;
    height: 3px;
    border-radius: 999px;
    background: currentColor;
    box-shadow: 0 0 10px rgba(250, 204, 21, 0.35);
    transition: transform 0.25s ease, opacity 0.2s ease;
}

.site-nav__toggle span:nth-child(1) {
    transform: translateY(-8px);
}

.site-nav__toggle span:nth-child(3) {
    transform: translateY(8px);
}

.site-nav__toggle--open span:nth-child(1) {
    transform: rotate(45deg);
}

.site-nav__toggle--open span:nth-child(2) {
    opacity: 0;
}

.site-nav__toggle--open span:nth-child(3) {
    transform: rotate(-45deg);
}

body.site-nav-open {
    overflow: hidden;
}

@media (max-width: 900px) {
    :root {
        --site-nav-top: calc(env(safe-area-inset-top, 0px) + 0.5rem);
        --site-nav-edge: 0.75rem;
    }

    .site-nav {
        grid-template-columns: auto 1fr auto;
        min-height: 64px;
        padding: 0.55rem 0.85rem;
    }

    .site-nav.site-nav--open {
        inset: 0;
        z-index: 100100;
        width: 100vw;
        height: 100vh;
        height: 100svh;
        min-height: 100vh;
        min-height: 100svh;
        padding: 0;
        border-radius: 0;
        overflow: hidden;
        isolation: isolate;
    }

    .site-nav.site-nav--scrolled {
        min-height: 64px;
        padding: 0.55rem 0.85rem;
    }

    .site-nav.site-nav--open.site-nav--scrolled {
        min-height: 100vh;
        min-height: 100svh;
        padding: 0;
    }

    .site-nav::before {
        border-radius: 20px;
    }

    .site-nav.site-nav--open::before {
        opacity: 0;
    }

    .site-nav__brand {
        grid-column: 1;
        z-index: 10060;
    }

    .site-nav--open .site-nav__brand {
        position: fixed;
        top: calc(env(safe-area-inset-top, 0px) + 1.05rem);
        left: 1.5rem;
    }

    .site-nav__logo {
        width: 40px;
        height: 40px;
    }

    .site-nav__toggle {
        display: inline-flex;
        grid-column: 3;
        z-index: 10060;
    }

    .site-nav--open .site-nav__toggle {
        position: fixed;
        top: calc(env(safe-area-inset-top, 0px) + 0.95rem);
        right: 1.5rem;
        z-index: 100120;
    }

    .site-nav__menu {
        position: fixed;
        inset: 0;
        z-index: 10040;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: clamp(1.4rem, 6vh, 2.25rem);
        width: 100%;
        height: 100vh;
        height: 100svh;
        min-height: 100vh;
        min-height: 100svh;
        padding: calc(env(safe-area-inset-top, 0px) + 6rem) 1.5rem calc(env(safe-area-inset-bottom, 0px) + 3rem);
        background: rgba(6, 10, 22, 0.98);
        backdrop-filter: blur(24px);
        -webkit-backdrop-filter: blur(24px);
        opacity: 0;
        visibility: hidden;
        overflow-y: auto;
        overscroll-behavior: contain;
        pointer-events: none;
        transform: translateY(-8px);
        transition: opacity 0.22s ease, visibility 0.22s ease, transform 0.22s ease;
    }

    .site-nav--open .site-nav__menu {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: translateY(0);
    }

    .site-nav__link {
        width: min(100%, 18rem);
        min-height: 48px;
        padding: 0.5rem 1rem;
        color: var(--light-text, #e5e7eb);
        font-size: 1.25rem;
        opacity: 1;
        visibility: visible;
    }
}

@media (max-width: 380px) {
    .site-nav {
        left: 0.5rem;
        right: 0.5rem;
    }

    .site-nav__menu {
        gap: 1.1rem;
    }
}