/*
 * Site-wide layout: header/navigation and footer.
 * Nav collapses to a drawer below 860px (a boundary specific to how
 * much the six nav labels need before wrapping, not tied to the
 * mobile/tablet/desktop breakpoints documented in tokens.css).
 */

.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    background-color: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--color-border);
}

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

.brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
    color: var(--color-ink);
    text-decoration: none;
    flex-shrink: 0;
    letter-spacing: -0.01em;
}

.brand:hover {
    text-decoration: none;
}

.brand-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-full);
    background: linear-gradient(150deg, var(--color-primary-soft), var(--color-accent-soft));
    flex-shrink: 0;
}

.brand-mark svg {
    width: 1.3rem;
    height: 1.3rem;
    color: var(--color-primary-dark);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 2.5rem;
    height: 2.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
    flex-shrink: 0;
    transition: border-color 0.15s ease, background-color 0.15s ease;
}

.nav-toggle:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-100);
}

.nav-toggle-bar {
    display: block;
    width: 20px;
    height: 2px;
    background-color: var(--color-text);
    border-radius: var(--radius-full);
}

.site-nav ul {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.site-nav a {
    display: inline-block;
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-full);
    transition: background-color 0.15s ease, color 0.15s ease;
}

.site-nav a:hover {
    color: var(--color-primary-dark);
    background-color: var(--color-primary-100);
    text-decoration: none;
}

.site-nav a[aria-current="page"] {
    color: var(--color-primary-dark);
    background-color: var(--color-primary-soft);
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
}

@media (max-width: 860px) {
    .nav-toggle {
        display: inline-flex;
    }

    .site-nav {
        position: absolute;
        top: calc(var(--header-height) - 1px);
        left: 0;
        right: 0;
        background-color: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
        box-shadow: var(--shadow-lg);
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        transition: max-height 0.22s ease, opacity 0.18s ease;
    }

    .site-nav.is-open {
        max-height: 480px;
        opacity: 1;
    }

    .site-nav ul {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-1);
        padding: var(--space-3) var(--space-5) var(--space-6);
    }

    .site-nav a {
        display: block;
        padding: var(--space-3) var(--space-4);
        border-radius: var(--radius-md);
    }

    .site-nav a[aria-current="page"] {
        border-left: 3px solid var(--color-primary);
    }
}

/* ---- Footer ---- */

.site-footer {
    background-color: var(--color-ink);
    color: #ffffff;
    position: relative;
}

.site-footer::before {
    content: "";
    display: block;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent), var(--color-secondary));
}

.footer-inner {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: var(--space-6);
    padding: var(--space-7) 0 var(--space-6);
}

.site-footer h2 {
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: var(--space-3);
}

.site-footer p {
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 0;
}

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

.site-footer a {
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
    font-size: var(--font-size-sm);
}

.site-footer a:hover {
    color: #ffffff;
    text-decoration: underline;
}

.footer-brand .brand-name {
    display: block;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-xl);
    color: #ffffff;
    margin-bottom: var(--space-3);
    letter-spacing: -0.01em;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding: var(--space-4) 0;
}

.footer-bottom p {
    margin: 0;
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.5);
    text-align: center;
}

@media (max-width: 767px) {
    .footer-inner {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    }
}

@media (max-width: 575px) {
    .footer-inner {
        grid-template-columns: 1fr;
        gap: var(--space-5);
    }
}