/* ==========================================================================
   NAVIGATION — Zeta IT Consulting
   Site header, nav links, mobile hamburger, footer.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. SITE HEADER
   -------------------------------------------------------------------------- */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    padding-block: var(--space-4);
    border-bottom: 1px solid var(--color-border-subtle);
    transition: border-color var(--duration-normal) var(--ease-out);
}

/* Frosted-glass backdrop on a pseudo-element so that backdrop-filter does
   not turn the header into a containing block for fixed-position children
   (which would break the full-viewport mobile nav overlay). */
.site-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background-color: rgba(15, 17, 23, 0.85);
    -webkit-backdrop-filter: blur(12px) saturate(150%);
    backdrop-filter: blur(12px) saturate(150%);
    z-index: -1;
    transition: background-color var(--duration-normal) var(--ease-out);
}

/* Scrolled state — denser background after scrolling past threshold (toggled by JS) */
.site-header.is-scrolled {
    border-bottom-color: var(--color-border);
}

.site-header.is-scrolled::before {
    background-color: rgba(15, 17, 23, 0.95);
}

/* Push page content below fixed header */
body {
    padding-top: 4.5rem;
}


/* --------------------------------------------------------------------------
   2. LOGO
   -------------------------------------------------------------------------- */

.site-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-wordmark {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 700;
    letter-spacing: var(--tracking-tight);
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}


/* --------------------------------------------------------------------------
   3. DESKTOP NAV
   -------------------------------------------------------------------------- */

.nav-list {
    display: flex;
    gap: var(--space-1);
}

.nav-link {
    display: block;
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    border-radius: var(--radius-md);
    transition:
        color var(--duration-fast) var(--ease-out),
        background-color var(--duration-fast) var(--ease-out);
}

.nav-link:hover {
    color: var(--color-text);
    background-color: var(--color-bg-hover);
}

.nav-link.is-active {
    color: #fff;
    background-color: rgba(99, 102, 241, 0.12);
}


/* --------------------------------------------------------------------------
   3b. NAV CTA BUTTON
   -------------------------------------------------------------------------- */

.site-nav {
    display: flex;
    align-items: center;
}

.nav-cta {
    margin-left: var(--space-4);
    white-space: nowrap;
}

/* --------------------------------------------------------------------------
   4. HAMBURGER TOGGLE (hidden on desktop)
   -------------------------------------------------------------------------- */

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 2.75rem;  /* 44px min touch target */
    height: 2.75rem;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: background-color var(--duration-fast) var(--ease-out);
}

.nav-toggle:hover {
    background-color: var(--color-bg-hover);
}

.nav-toggle-bar {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    border-radius: 1px;
    transition:
        transform var(--duration-normal) var(--ease-out),
        opacity var(--duration-fast) var(--ease-out);
    transform-origin: center;
}

/* Animated "X" state when open */
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}


/* --------------------------------------------------------------------------
   5. MOBILE NAV
   -------------------------------------------------------------------------- */

@media (max-width: 48em) {
    .nav-toggle {
        display: flex;
    }

    .site-nav {
        position: fixed;
        top: 4.5rem;   /* below header */
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        background-color: rgb(15, 17, 23);
        -webkit-backdrop-filter: blur(16px);
        backdrop-filter: blur(16px);
        padding: var(--space-8) var(--space-6);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-8px);
        transition:
            opacity var(--duration-normal) var(--ease-out),
            visibility var(--duration-normal),
            transform var(--duration-normal) var(--ease-out);
        z-index: var(--z-overlay);
    }

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

    .nav-list {
        flex-direction: column;
        gap: var(--space-2);
    }

    .nav-link {
        font-size: var(--text-lg);
        padding: var(--space-3) var(--space-4);
        min-height: 2.75rem; /* 44px touch target */
        display: flex;
        align-items: center;
    }

    .nav-cta {
        margin-left: 0;
        margin-top: var(--space-4);
        width: 100%;
        text-align: center;
    }
}


/* --------------------------------------------------------------------------
   6. SITE FOOTER
   -------------------------------------------------------------------------- */

.site-footer {
    padding-block: var(--space-12);
    border-top: 1px solid var(--color-border);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.footer-brand {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 700;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.footer-nav {
    order: 2;
    width: 100%;
}

.footer-nav-list {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-nav-list a {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-out);
}

.footer-nav-list a:hover {
    color: var(--color-accent-hover);
}

.footer-copy {
    font-size: var(--text-sm);
    color: var(--color-text-faint);
    order: 3;
    width: 100%;
}

@media (max-width: 48em) {
    .footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .footer-nav-list {
        justify-content: center;
    }
}


/* --------------------------------------------------------------------------
   7. REDUCED MOTION
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    .site-header,
    .site-nav,
    .nav-link,
    .nav-toggle,
    .nav-toggle-bar,
    .footer-nav-list a {
        transition: none;
    }

    .site-nav {
        transform: none;
    }
}