/**
 * A.R.C Technology — Resilient Orbit Footer
 * Navy cosmos base, teal energy accents, neubrutalist weight
 */

/* ===========================
   FOOTER BASE
   =========================== */
.footer {
    background-color: var(--color-navy);
    color: var(--color-text-on-dark);
    position: relative;
    overflow: hidden;
}

/* Gradient top border — teal > coral > yellow */
.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: var(--border-thick);
    background: linear-gradient(90deg, var(--color-teal), var(--color-coral), var(--color-yellow));
    z-index: 2;
}

/* Subtle radial glow */
.footer::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 60% 40% at 50% 0%, rgba(0, 212, 255, 0.06) 0%, transparent 60%);
    pointer-events: none;
}

/* ===========================
   TOP SECTION — Logo left, nav columns right
   =========================== */
.footer__top {
    display: grid;
    grid-template-columns: 1.75fr 1fr 1fr 1fr;
    gap: clamp(2rem, 4vw, 4rem);
    padding: clamp(4rem, 8vw, 6rem) var(--container-px) clamp(3rem, 6vw, 5rem);
    max-width: var(--container-max);
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* ===========================
   BRAND COLUMN
   =========================== */
.footer__brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.footer__logo-link {
    display: inline-block;
    transition: opacity var(--transition-fast) ease,
                transform var(--transition-base) var(--ease-bounce);
}

.footer__logo-link:hover {
    opacity: 0.85;
    transform: scale(1.03);
}

.footer__logo {
    height: 36px;
    width: auto;
}

.footer__tagline {
    font-family: var(--font-family);
    font-size: var(--fs-sm);
    line-height: var(--leading-relaxed);
    color: var(--color-text-on-dark-secondary);
    max-width: 280px;
}

.footer__contact {
    font-family: var(--font-family);
    font-size: var(--fs-sm);
    line-height: var(--leading-relaxed);
    color: var(--color-text-on-dark-secondary);
}

.footer__contact a {
    color: var(--color-text-on-dark-secondary);
    text-decoration: none;
    transition: color var(--transition-fast) ease;
}

.footer__contact a:hover,
.footer__contact a:focus-visible {
    color: var(--color-teal);
    text-decoration: underline;
}

/* ===========================
   SOCIAL LINKS — 44px teal circles
   =========================== */
.footer__social {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer__social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
    border-radius: var(--radius-full);
    background: transparent;
    border: var(--border-medium) solid var(--color-teal);
    color: var(--color-teal);
    text-decoration: none;
    transition:
        color var(--transition-base) var(--ease-bounce),
        background-color var(--transition-base) var(--ease-bounce),
        border-color var(--transition-base) var(--ease-bounce),
        box-shadow var(--transition-base) var(--ease-bounce),
        transform var(--transition-base) var(--ease-bounce);
}

.footer__social-link:hover {
    background-color: var(--color-teal);
    color: var(--color-navy);
    box-shadow: 0 0 20px var(--color-teal-glow);
    transform: translateY(-3px) scale(1.08);
    text-decoration: none;
}

.footer__social-link:active {
    transform: translateY(-1px) scale(1.02);
}

.footer__social-link svg {
    width: 20px;
    height: 20px;
    pointer-events: none;
    flex-shrink: 0;
}

/* ===========================
   NAV COLUMNS
   =========================== */
.footer__nav-col {
    display: flex;
    flex-direction: column;
}

.footer__nav-heading {
    font-family: var(--font-display);
    font-size: var(--fs-label);
    font-weight: var(--font-bold);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--color-teal);
    margin-bottom: var(--space-5);
}

.footer__nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.footer__nav-list a {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    font-family: var(--font-family);
    font-size: var(--fs-sm);
    color: var(--color-text-on-dark-secondary);
    text-decoration: none;
    position: relative;
    transition: color var(--transition-base) var(--ease-smooth);
    padding: 0.125rem 0;
}

/* Underline slide from left */
.footer__nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-teal);
    border-radius: var(--radius-full);
    transition: width var(--transition-base) var(--ease-bounce);
}

.footer__nav-list a:hover {
    color: var(--color-teal);
    text-decoration: none;
}

.footer__nav-list a:hover::after {
    width: 100%;
}

/* ===========================
   BOTTOM BAR
   =========================== */
.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    z-index: 1;
}

.footer__bottom-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: var(--space-5) var(--container-px);
    max-width: var(--container-max);
    margin: 0 auto;
    flex-wrap: wrap;
}

.footer__copyright {
    font-family: var(--font-family);
    font-size: var(--fs-xs);
    color: var(--color-text-on-dark-muted);
    margin: 0;
    letter-spacing: 0.02em;
}

.footer__credit {
    font-family: var(--font-family);
    font-size: var(--fs-xs);
    color: var(--color-text-on-dark-muted);
    margin: 0;
    letter-spacing: 0.02em;
}

.footer__credit a {
    color: var(--color-teal);
    transition: color var(--transition-fast) ease;
}

.footer__credit a:hover {
    color: var(--color-white);
}

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 1023px) {
    .footer__top {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-8);
    }

    .footer__brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 767px) {
    .footer__top {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }

    .footer__brand {
        grid-column: auto;
    }

    .footer__bottom-inner {
        flex-direction: column;
        text-align: center;
    }

}

@media (prefers-reduced-motion: reduce) {
    .back-to-top,
    .footer__social-link,
    .footer__nav-list a::after {
        transition: none;
    }
}