/* ================================================================
   LAYOUT SHELLS  —  nav, header, footer, page wrappers
   ================================================================ */


/* ──────────────────────────────────────────────────────────────
   SITE HEADER  +  NAV
   ────────────────────────────────────────────────────────────── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 200;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    /* single accent pixel at the very bottom */
    box-shadow: 0 1px 0 0 var(--accent-line);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-5);
    height: var(--nav-height);
    width: min(calc(100% - 48px), var(--max-width));
    margin: 0 auto;
}

/* Logo mark */
.site-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--text-primary);
    text-decoration: none;
    flex-shrink: 0;
}

.site-logo__mark {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
}

.site-logo__text {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.site-logo__text em {
    font-style: normal;
    color: var(--accent);
}

/* Primary nav */
.site-nav {
    display: flex;
    align-items: center;
    gap: 0;
}

.site-nav__link {
    position: relative;
    display: inline-flex;
    align-items: center;
    padding: 0 var(--space-4);
    height: var(--nav-height);
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    letter-spacing: 0.01em;
    transition: color 0.12s;
}

.site-nav__link:hover {
    color: var(--text-primary);
}

/* Active: accent underline bar */
.site-nav__link.is-active {
    color: var(--text-primary);
}

.site-nav__link.is-active::after {
    content: "";
    position: absolute;
    bottom: -1px;   /* sits on top of header border */
    left: var(--space-4);
    right: var(--space-4);
    height: 2px;
    background: var(--accent);
    border-radius: 1px 1px 0 0;
}

/* Nav CTA button */
.site-nav__cta {
    margin-left: var(--space-4);
}


/* ──────────────────────────────────────────────────────────────
   SITE FOOTER
   ────────────────────────────────────────────────────────────── */
.site-footer {
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
}

.site-footer__inner {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, minmax(0, 1fr));
    gap: var(--space-6);
    width: min(calc(100% - 48px), var(--max-width));
    margin: 0 auto;
    padding: var(--space-7) 0 var(--space-5);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-brand__tagline {
    font-size: var(--text-sm);
    color: var(--text-muted);
    font-style: italic;
    max-width: 28ch;
    line-height: 1.5;
}

.footer-col__heading {
    font-family: var(--font-display);
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-3);
}

.footer-col__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.footer-col__list a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-secondary);
    font-size: var(--text-sm);
    transition: color 0.12s;
}

.footer-col__list a:hover {
    color: var(--text-primary);
}

.footer-col__list i {
    font-size: 0.9em;
    color: var(--text-muted);
}

.site-footer__bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    width: min(calc(100% - 48px), var(--max-width));
    margin: 0 auto;
    padding: var(--space-4) 0;
    border-top: 1px solid var(--border);
    font-size: var(--text-xs);
    color: var(--text-muted);
}

.site-footer__bottom a {
    color: var(--text-muted);
    transition: color 0.12s;
}

.site-footer__bottom a:hover {
    color: var(--text-secondary);
}

@media (max-width: 900px) {
    .site-footer__inner {
        grid-template-columns: 1fr 1fr;
    }

    .footer-brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 580px) {
    .site-header__inner {
        width: min(calc(100% - 32px), var(--max-width));
    }

    .site-nav__link {
        padding: 0 var(--space-3);
        font-size: var(--text-xs);
    }

    .site-nav__cta {
        margin-left: var(--space-2);
    }

    .site-footer__inner {
        grid-template-columns: 1fr;
        width: min(calc(100% - 32px), var(--max-width));
        padding: var(--space-5) 0 var(--space-4);
    }

    .site-footer__bottom {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
        width: min(calc(100% - 32px), var(--max-width));
    }
}


/* ──────────────────────────────────────────────────────────────
   PAGE BANNER  (breadcrumb-style section intro)
   ────────────────────────────────────────────────────────────── */
.page-banner {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--space-4);
    padding-bottom: var(--space-5);
    border-bottom: 1px solid var(--border);
}

.page-banner__copy { display: flex; flex-direction: column; gap: var(--space-2); }

.page-banner__title {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.1;
}

.page-banner__desc {
    font-size: var(--text-md);
    color: var(--text-secondary);
    max-width: 60ch;
    margin: 0;
}

.page-banner__meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-shrink: 0;
}

@media (max-width: 640px) {
    .page-banner {
        flex-direction: column;
        align-items: flex-start;
    }
}