/* Post Navigation and Related Reading Styles */

/* Post Navigation Container */
.post-navigation {
    margin: 2.5rem 0;
    padding: 0;
}

.nav-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

/* Navigation Links */
.nav-link {
    display: flex;
    flex-direction: column;
    padding: 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s ease;
    min-height: 100px;
    justify-content: space-between;
    background-color: var(--bg-color);
}

.nav-link:hover {
    border-color: var(--link-normal);
    background-color: var(--code-bg-color);
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.secondary-theme .nav-link:hover {
    box-shadow: 0 2px 8px rgba(255, 255, 255, 0.1);
}

/* Navigation Previous */
.nav-prev {
    text-align: left;
    border-left: 3px solid transparent;
}

.nav-prev:hover {
    border-left-color: var(--link-normal);
}

/* Navigation Next */
.nav-next {
    text-align: right;
    border-right: 3px solid transparent;
}

.nav-next:hover {
    border-right-color: var(--link-normal);
}

/* Navigation Empty State */
.nav-empty {
    pointer-events: none;
    opacity: 0.3;
}

/* Navigation Arrow */
.nav-arrow {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--link-normal);
    transition: transform 0.3s ease;
}

.nav-prev .nav-arrow {
    order: -1;
}

.nav-next .nav-arrow {
    order: 3;
}

.nav-link:hover .nav-arrow {
    color: var(--link-hover);
}

.nav-prev:hover .nav-arrow {
    transform: translateX(-3px);
}

.nav-next:hover .nav-arrow {
    transform: translateX(3px);
}

/* Navigation Label */
.nav-label {
    font-size: 0.875rem;
    color: var(--secondary-text-color);
    font-weight: 500;
    margin: 0.5rem 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Navigation Title */
.nav-title {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--link-normal);
    transition: color 0.3s ease;
    word-break: break-word;
}

.nav-link:hover .nav-title {
    color: var(--link-hover);
}

/* Related Reading Section */
.related-reading {
    margin-top: 2.5rem;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background-color: var(--code-bg-color);
}

.secondary-theme .related-reading {
    background-color: rgba(51, 51, 51, 0.3);
}

.related-title {
    margin: 0 0 1.25rem 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    border-bottom: 2px solid var(--link-normal);
    padding-bottom: 0.75rem;
}

.related-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.related-item {
    display: flex;
}

.related-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    border-radius: 0.375rem;
    text-decoration: none;
    color: var(--link-normal);
    border: 1px solid transparent;
    transition: all 0.2s ease;
    flex: 1;
    min-width: 0;
}

.related-link:hover {
    background-color: var(--bg-color);
    border-color: var(--link-normal);
    color: var(--link-hover);
}

.secondary-theme .related-link:hover {
    background-color: rgba(51, 51, 51, 0.5);
}

.related-post-title {
    flex: 1;
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

.related-post-date {
    flex-shrink: 0;
    font-size: 0.875rem;
    color: var(--secondary-text-color);
    font-variant-numeric: tabular-nums;
}

.related-link:hover .related-post-date {
    color: var(--text-color);
}

/* Responsive Design */
@media (max-width: 640px) {
    .nav-container {
        grid-template-columns: 1fr;
    }

    .nav-link {
        min-height: 90px;
    }

    .nav-prev,
    .nav-next {
        text-align: left;
        border-left: 3px solid transparent;
        border-right: none;
    }

    .nav-prev:hover,
    .nav-next:hover {
        border-left-color: var(--link-normal);
        border-right: none;
    }

    .nav-next .nav-arrow {
        order: -1;
    }

    .nav-prev:hover .nav-arrow,
    .nav-next:hover .nav-arrow {
        transform: translateX(-3px);
    }

    .related-link {
        flex-direction: column;
        align-items: flex-start;
    }

    .related-post-date {
        font-size: 0.8125rem;
    }
}

@media (max-width: 480px) {
    .post-navigation,
    .related-reading {
        margin: 1.5rem -0.5rem;
        padding: 1rem;
        border-radius: 0;
    }

    .nav-link {
        padding: 1rem;
        min-height: 85px;
    }

    .nav-label {
        font-size: 0.75rem;
    }

    .nav-title {
        font-size: 0.95rem;
    }

    .related-list {
        gap: 0.5rem;
    }

    .related-link {
        padding: 0.625rem;
    }
}

/* Dark mode adjustments for better contrast */
.secondary-theme .nav-link {
    background-color: rgba(51, 51, 51, 0.2);
}

.secondary-theme .nav-link:hover {
    background-color: rgba(51, 51, 51, 0.5);
}

.secondary-theme .related-reading {
    border-color: var(--border-color);
}

/* Accessibility improvements */
.nav-link:focus,
.related-link:focus {
    outline: 2px solid var(--link-normal);
    outline-offset: 2px;
}

/* Quick Related Posts Section (below prev/next) */
.nav-related-quick {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.nav-related-title {
    margin: 0 0 0.75rem 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-color);
}

.nav-related-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-related-item {
    display: flex;
}

.nav-related-link {
    padding: 0.5rem 0;
    color: var(--link-normal);
    text-decoration: none;
    font-size: 0.95rem;
    border-bottom: 1px solid transparent;
    transition: all 0.2s ease;
    word-break: break-word;
}

.nav-related-link:hover {
    color: var(--link-hover);
    border-bottom-color: var(--link-normal);
}

/* Responsive adjustments for quick related */
@media (max-width: 480px) {
    .nav-related-quick {
        margin-top: 1rem;
        padding-top: 1rem;
    }

    .nav-related-title {
        font-size: 0.875rem;
    }

    .nav-related-link {
        font-size: 0.9rem;
    }
}

/* Print styles */
@media print {
    .post-navigation,
    .related-reading {
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}