/* ============================================
   Footer Styles
   ============================================ */
.footer {
    /* 1. Positioning */
    position: relative;
    overflow: hidden;

    /* 2. Box Model */
    width: 100%;

    /* 3. Typography */

    /* 4. Visual */
    background-color: var(--color-footer-bg);
    border-top: 1px solid var(--color-footer-border);

    /* 5. Misc */
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: var(--spacing-xl);
    background: linear-gradient(
        180deg,
        var(--color-footer-fade) 0%,
        transparent 100%
    );
    pointer-events: none;
    z-index: 0;
}

.footer-container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--container-padding-mobile);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    position: relative;
    z-index: 1;
}

@media (min-width: 768px) {
    .footer-container {
        padding: var(--spacing-2xl) var(--container-padding-tablet);
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }
}

@media (min-width: 1024px) {
    .footer-container {
        padding: var(--spacing-3xl) var(--container-padding-desktop);
        grid-template-columns: repeat(4, 1fr);
        gap: var(--spacing-2xl);
        align-items: start;
    }
}

/* ============================================
   Footer Columns
   ============================================ */
.footer-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    min-width: 0;
}

.footer-column:nth-child(1),
.footer-column:nth-child(2),
.footer-column:nth-child(3),
.footer-column:nth-child(4) {
    flex: 1;
    max-width: 100%;
}

.footer-heading {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.footer-category {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.8;
}

.footer-subheading {
    /* 1. Positioning */

    /* 2. Box Model */
    margin-bottom: var(--spacing-xs);

    /* 3. Typography */
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;

    /* 4. Visual */

    /* 5. Misc */
}

.footer-text {
    font-size: var(--font-size-base);
    color: var(--color-primary);
    line-height: 1.6;
    opacity: 0.8;
    max-width: calc(var(--spacing-3xl) * 4);
}

/* ============================================
   Footer Links
   ============================================ */
.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-link {
    display: inline-block;
    font-size: var(--font-size-base);
    color: var(--color-primary);
    padding: var(--spacing-xs) 0;
    min-height: var(--touch-target-min);
    transition: color var(--transition-base),
                opacity var(--transition-base);
    width: fit-content;
    opacity: 0.7;
    position: relative;
}

.footer-link:hover,
.footer-link:focus-visible {
    color: var(--color-secondary);
    opacity: 1;
    transform: none; /* Kein Springen nach rechts */
}

/* ============================================
   Footer Bottom
   ============================================ */
.footer-bottom {
    width: 100%;
    border-top: 1px solid var(--color-footer-border);
    padding: var(--spacing-lg) var(--container-padding-mobile);
    background-color: var(--color-footer-bg);
    position: relative;
    z-index: 1;
}

@media (min-width: 768px) {
    .footer-bottom {
        padding: var(--spacing-lg) var(--container-padding-tablet);
    }
}

@media (min-width: 1024px) {
    .footer-bottom {
        padding: var(--spacing-lg) var(--container-padding-desktop);
    }
}

.footer-copyright {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    text-align: center;
    opacity: 0.6;
}

@media (min-width: 768px) {
    .footer-copyright {
        text-align: left;
    }
}

.footer-built,
.footer-claim {
    width: 100%;
    max-width: var(--container-max-width);
    margin: var(--spacing-xs) auto 0;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--color-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.footer-built-icon,
.footer-claim-icon {
    color: var(--color-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.footer-built-text,
.footer-claim-text {
    color: inherit;
    opacity: 1;
}

@media (min-width: 768px) {
    .footer-built,
    .footer-claim {
        justify-content: flex-start;
        text-align: left;
    }
}

/* ============================================
   Footer Social Links
   ============================================ */
.footer-social-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-social-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-social-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    color: var(--color-primary);
    transition: color var(--transition-base),
                transform var(--transition-base);
    width: fit-content;
    position: relative;
}

.footer-social-link svg {
    width: 32px;
    height: 32px;
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.social-text {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    opacity: 0.8;
    transition: opacity var(--transition-base);
}

.footer-social-link:hover,
.footer-social-link:focus-visible {
    color: var(--color-secondary);
    transform: none; /* Kein Springen nach rechts */
}

.footer-social-link:hover .social-text,
.footer-social-link:focus-visible .social-text {
    opacity: 1;
}

.footer-social-link:hover svg,
.footer-social-link:focus-visible svg {
    transform: scale(1.1);
}

/* ============================================
   Accessibility
   ============================================ */
.footer-link:focus-visible,
.footer-social-link:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
    border-radius: 2px;
}