/* =========================================================
   Single Post Layout
   ========================================================= */

.single-post {
    padding-bottom: 0;
}

/* =========================================================
   Reading Progress Bar
   ========================================================= */

.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: transparent;
    z-index: 9999;
    pointer-events: none;
}

.reading-progress__bar {
    height: 100%;
    width: 0;
    background: var(--gradient-accent);
    transition: width 0.1s linear;
}

/* =========================================================
   Post Hero
   ========================================================= */

.post-hero {
    padding: 2.5rem 0 2rem;
    background: var(--color-bg);
}

.post-title {
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 4vw, 2.875rem);
    font-weight: 800;
    line-height: 1.2;
    color: var(--color-dark);
    margin: 1rem 0 1.75rem;
    max-width: 820px;
}

.post-thumbnail {
    margin-top: 2rem;
    border-radius: var(--radius);
    overflow: hidden;
    max-height: 500px;
}

.post-thumbnail__img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* =========================================================
   Post Body — 2-column grid (content + sidebar)
   ========================================================= */

.post-body-wrap {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 284px;
    gap: 3.5rem;
    padding-top: 2.5rem;
    align-items: start;
}

.post-content-col {
    min-width: 0;
}

/* =========================================================
   Sidebar
   ========================================================= */

.post-sidebar {
    position: sticky;
    top: 88px;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

/* ——— Table of Contents ——— */

.post-toc {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem 1.25rem 1.375rem;
}

.post-toc__title {
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--color-muted);
    margin: 0 0 0.875rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--color-border);
}

.toc-item {
    line-height: 1;
}

.toc-item + .toc-item {
    margin-top: 0.5rem;
}

.toc-link {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text);
    text-decoration: none;
    line-height: 1.45;
    transition: color 0.15s;
    padding: 0.1rem 0;
}

.toc-link--h3 {
    padding-left: 0.875rem;
    font-size: 0.8125rem;
    color: var(--color-muted);
}

.toc-link:hover {
    color: var(--color-dark);
}

.toc-link.is-active {
    color: var(--color-accent);
    font-weight: 600;
}


/* =========================================================
   Tags
   ========================================================= */

.post-tags {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    margin-top: 2.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.post-tags__label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-muted);
}

.post-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 9999px;
    font-size: 0.8125rem;
    color: var(--color-text);
    text-decoration: none;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.post-tag:hover {
    background: var(--color-dark);
    border-color: var(--color-dark);
    color: var(--color-white);
}

/* =========================================================
   Share Buttons
   ========================================================= */

.share-buttons {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.625rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.share-buttons__label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-muted);
    margin-right: 0.25rem;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid var(--color-border);
    background: var(--color-white);
    color: var(--color-text);
    transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.15s;
    font-family: var(--font-body);
    flex-shrink: 0;
}

.share-btn:hover {
    background: var(--color-dark);
    border-color: var(--color-dark);
    color: var(--color-white);
    transform: translateY(-1px);
}

.share-btn--twitter,
.share-btn--facebook,
.share-btn--linkedin {
    background: var(--color-dark);
    border-color: var(--color-dark);
    color: var(--color-white);
}

.share-btn--twitter:hover,
.share-btn--facebook:hover,
.share-btn--linkedin:hover {
    opacity: 0.8;
    transform: translateY(-1px);
}

.share-btn--copy .share-btn__icon-check { display: none; }
.share-btn--copy.copied .share-btn__icon-copy { display: none; }
.share-btn--copy.copied .share-btn__icon-check { display: block; }

.share-btn--copy.copied {
    background: var(--color-dark);
    color: var(--color-white);
    border-color: var(--color-dark);
}

/* =========================================================
   Post Navigation (prev / next)
   ========================================================= */

.post-nav {
    display: flex;
    gap: 1.5rem;
    margin-top: 3rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--color-border);
}

.post-nav__prev,
.post-nav__next {
    flex: 1;
}

.post-nav__next {
    text-align: right;
}

.post-nav__link {
    display: inline-flex;
    flex-direction: column;
    gap: 0.375rem;
    text-decoration: none;
    max-width: 100%;
}

.post-nav__dir {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-muted);
}

.post-nav__label {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-dark);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-nav__link:hover .post-nav__label {
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* =========================================================
   Author Bio
   ========================================================= */

.author-bio {
    display: flex;
    align-items: flex-start;
    gap: 1.25rem;
    padding: 2rem;
    margin-top: 3rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.author-bio__image img {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.author-bio__label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-muted);
    margin: 0 0 0.25rem;
}

.author-bio__name {
    font-family: var(--font-heading);
    font-size: 1.0625rem;
    font-weight: 700;
    margin: 0 0 0.5rem;
}

.author-bio__name a {
    text-decoration: none;
    color: var(--color-dark);
}

.author-bio__name a:hover { color: var(--color-text); }

.author-bio__description {
    font-size: 0.9rem;
    color: var(--color-muted);
    line-height: 1.6;
    margin: 0;
}

/* =========================================================
   Related Posts
   ========================================================= */

.related-posts {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 1px solid var(--color-border);
}

.related-posts__title {
    font-family: var(--font-heading);
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--color-dark);
    margin: 0 0 1.5rem;
}

/* =========================================================
   Post Meta (hero area)
   ========================================================= */

.post-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem 1rem;
    font-size: 0.875rem;
    color: var(--color-muted);
}

.post-meta__category {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-accent);
    text-decoration: none;
    padding: 0.2rem 0.6rem;
    background: var(--color-white);
    border: 1px solid var(--color-accent);
    border-radius: 4px;
}

.post-meta__category:hover {
    background: var(--gradient-accent);
    border-color: transparent;
    color: var(--color-white);
}

.post-meta__author a {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 600;
}

.post-meta__author a:hover { color: var(--color-dark); }

.post-meta__read-time {
    font-style: italic;
}

/* =========================================================
   Page links (paginated posts)
   ========================================================= */

.page-links {
    margin-top: 2rem;
    font-size: 0.9rem;
    color: var(--color-muted);
}

.page-links a {
    margin-left: 0.375rem;
    color: var(--color-dark);
}

/* =========================================================
   Back to Top Button
   ========================================================= */

.back-to-top {
    display: none;
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    background: var(--gradient-accent);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 998;
    transition: opacity 0.2s, transform 0.2s;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.back-to-top:hover {
    opacity: 0.8;
    transform: translateY(-3px);
}

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 1023px) {
    .post-body-wrap {
        grid-template-columns: 1fr;
    }

    .post-sidebar {
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 1rem;
    }

    .post-toc {
        flex: 1;
        min-width: 260px;
    }
}

@media (max-width: 639px) {
    .post-toc {
        display: none;
    }

    .post-nav {
        flex-direction: column;
        gap: 1.25rem;
    }

    .post-nav__next {
        text-align: left;
    }

    .author-bio {
        flex-direction: column;
    }

    .back-to-top {
        bottom: 1.25rem;
        right: 1.25rem;
    }
}