/**
 * Footer (S9-14): 4-колонный rich footer в стиле warm-platinum.
 * Колонки: brand + соцсети, навигация, контакты (SSOT), документы.
 *
 * @package SchoolKarjera
 */

.sk-footer {
    background: var(--color-bg-dark);
    color: var(--color-white);
    padding: var(--sp-16) 0 var(--sp-8);
    font-family: var(--font-body, 'Inter', -apple-system, sans-serif);
}

.sk-footer__container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--section-padding-x);
}

.sk-footer__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--sp-8);
}

@media (min-width: 640px) {
    .sk-footer__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--sp-10, 2.5rem);
    }
}

@media (min-width: 1024px) {
    .sk-footer__grid {
        grid-template-columns: 1.5fr 1fr 1.5fr 1fr;
        gap: var(--sp-12);
    }
}

/* === Колонка brand === */

.sk-footer__col--brand .sk-footer__logo-link {
    display: inline-block;
    margin: 0 0 var(--sp-4);
    text-decoration: none;
    color: inherit;
}

.sk-footer__logo {
    display: inline-block;
    font-family: var(--font-display, 'Playfair Display', Georgia, serif);
    font-size: var(--fs-32);
    font-weight: 700;
    letter-spacing: var(--ls-tight);
    color: var(--color-white);
    line-height: 1;
}

.sk-footer__pitch {
    font-size: var(--fs-14);
    line-height: 1.6;
    color: var(--color-platinum-300);
    margin: 0 0 var(--sp-6);
    max-width: 22rem;
}

.sk-footer__social {
    display: flex;
    gap: var(--sp-3);
}

.sk-footer__social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--color-white);
    text-decoration: none;
    transition: border-color var(--dur-fast) var(--ease-out),
                color var(--dur-fast) var(--ease-out),
                transform var(--dur-fast) var(--ease-out);
}

.sk-footer__social-link:hover,
.sk-footer__social-link:focus-visible {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
}

.sk-footer__social-link svg {
    width: 20px;
    height: 20px;
    display: block;
}

/* === Колонки общие (nav/contacts/docs) === */

.sk-footer__heading {
    font-family: var(--font-display, 'Playfair Display', Georgia, serif);
    font-size: var(--fs-14);
    font-weight: 600;
    letter-spacing: var(--ls-ultra);
    text-transform: uppercase;
    color: var(--color-accent);
    margin: 0 0 var(--sp-4);
}

.sk-footer__list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
}

.sk-footer__list li {
    font-size: var(--fs-14);
    color: var(--color-platinum-300);
    line-height: 1.5;
}

.sk-footer__list a {
    color: var(--color-platinum-300);
    text-decoration: none;
    transition: color var(--dur-fast) var(--ease-out);
}

.sk-footer__list a:hover,
.sk-footer__list a:focus-visible {
    color: var(--color-white);
}

/* === Контактная колонка === */

.sk-footer__col--contacts .sk-footer__contact-item {
    display: flex;
    flex-direction: column;
    gap: var(--sp-1);
    padding-bottom: var(--sp-2);
}

.sk-footer__address {
    color: var(--color-platinum-300);
    font-size: var(--fs-14);
}

.sk-footer__phone,
.sk-footer__email {
    color: var(--color-white);
    font-weight: 500;
    text-decoration: none;
    font-size: var(--fs-14);
    transition: color var(--dur-fast) var(--ease-out);
}

.sk-footer__phone:hover,
.sk-footer__email:hover,
.sk-footer__phone:focus-visible,
.sk-footer__email:focus-visible {
    color: var(--color-accent);
}

/* === Divider === */

.sk-footer__divider {
    height: 1px;
    background: var(--color-platinum-500);
    margin: var(--sp-12) 0 var(--sp-6);
    opacity: 0.3;
}

/* === Bottom bar === */

.sk-footer__bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: var(--sp-4);
    font-size: var(--fs-12);
    color: var(--color-platinum-300);
}

.sk-footer__copy,
.sk-footer__tagline {
    margin: 0;
}

.sk-footer__tagline {
    font-style: italic;
    opacity: 0.8;
}

/* === Focus-visible (WCAG AA) === */

.sk-footer a:focus-visible,
.sk-footer__social-link:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* === Reduced motion === */

@media (prefers-reduced-motion: reduce) {
    .sk-footer__social-link,
    .sk-footer__list a,
    .sk-footer__phone,
    .sk-footer__email {
        transition: none;
    }
    .sk-footer__social-link:hover,
    .sk-footer__social-link:focus-visible {
        transform: none;
    }
}