/* ═══════════════════════════════════════════════
   ARTICLE.CSS
   Blog POST page only (single article view):
   header/hero, table of contents, article body
   typography, in-article CTA, related posts,
   loading/error states.
   ═══════════════════════════════════════════════ */

.article-header {
    padding: 12rem 4rem 4rem;
    background: var(--bg-light);
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--border);
}

.article-header::before {
    content: "";
    position: absolute;
    top: -250px;
    right: -250px;
    width: 700px;
    height: 700px;
    background:
        radial-gradient(
            circle,
            rgba(37,99,235,0.12) 0%,
            transparent 70%
        );

    pointer-events: none;
}

.article-layout {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 4rem;
    align-items: start;

}
.article-toc {
    position: sticky;
    top: 120px;
    padding-top: 2rem;
}
.article-toc h3 {
    margin-bottom: 1rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
}
.article-toc ul {list-style: none;}
.article-toc li {margin-bottom: 0.75rem;}
.article-toc a {color: var(--muted); text-decoration: none;}
.article-toc a:hover {color: var(--accent);}

.back-link {
    display: inline-flex; align-items: center; gap: 0.5rem;
    color: var(--accent);
    text-decoration: none;
    font-size: 0.85rem; font-weight: 500; letter-spacing: 0.05em;
    margin-bottom: 2rem;
    transition: gap 0.2s;
    position: relative;
}
.back-link:hover { gap: 0.75rem; }
.back-link::before { content: '←'; }
.article-label {
    font-size: 0.75rem; font-weight: 500; letter-spacing: 0.2em;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 1rem;
}

#post-title {
    color: var(--bg-dark);
    max-width: 900px;
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 5rem);
    line-height: 1;
    letter-spacing: -0.02em;
    font-weight: 700;
    margin-bottom: 1.5rem;
    position: relative;
}
.article-meta {
    display: flex; align-items: center; gap: 1.5rem;
    font-size: 0.90rem; 
    color: var(--muted); 
    position: relative;
}

.article-body {
    max-width: 900px;
    margin: 0 auto;
    padding: 0;
}

/* ─── ARTICLE CTA ───────────────────────────── */

.article-cta {
    max-width: 1300px;
    margin: 4rem auto;
    padding: 5rem 4rem;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.article-cta-wrapper {
    padding: 0 2rem;
}

.article-cta::before {
    content: "";
    position: absolute;
    inset: 0;
    background-size: 60px 60px;
    pointer-events: none;
}

.article-cta::after {
    content: "";
    position: absolute;
    top: -250px;
    right: -250px;
    width: 600px;
    height: 600px;
    background: radial-gradient(
        circle,
        rgba(37, 99, 235, 0.1) 0%,
        transparent 70%
    );
    pointer-events: none;
}

.article-cta > * {
    position: relative;
    z-index: 1;
}

.article-cta h2 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3.5rem);
    line-height: 1;
    letter-spacing: -0.02em;
    color: var(--bg-dark);
    margin-bottom: 1.5rem;
}

.article-cta p {
    max-width: 650px;
    margin: 0 auto 2rem;
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--muted);
}

@media (max-width: 768px) {
    .article-cta {
        margin: 4rem 1.25rem;
        padding: 3rem 1.5rem;
    }

    .article-cta p {
        font-size: 1rem;
    }
}

/* ─── RELATED POSTS ─────────────────────────── */

.related-posts {
    max-width: 1350px;
    margin: 3rem auto 2rem;
    padding: 3rem 2rem 0rem;
}

.related-posts-header {
    max-width: 700px;
    margin: 0 0 2rem;
}

.related-posts-header h2 {
    margin-bottom: 0.75rem;
}

.related-posts-header p {
    color: var(--muted);
}

/* Grid */

.related-posts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

/* Card */

.related-post-card {
    background: var(--bg-mid);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition:
        transform 0.2s ease,
        border-color 0.2s ease,
        box-shadow 0.2s ease;
}

.related-post-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    box-shadow:
        0 10px 25px rgba(15, 23, 42, 0.06);
}

.related-post-card a {
    display: block;
    text-decoration: none;
}

/* Image */

.related-post-image {
    height: 140px;
    overflow: hidden;
}

.related-post-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;

    transition: transform 0.3s ease;
}

.related-post-card:hover img {
    transform: scale(1.03);
}

/* Content */

.related-post-content {
    padding: 1.25rem;
}

.related-post-date {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.related-post-content h3 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    line-height: 1.3;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.related-post-content p {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--muted);
    display: -webkit-box;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

@media (max-width: 900px) {
    .related-posts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .related-posts {
        padding: 4rem 1.25rem;
    }

    .related-posts-header {
        margin-bottom: 3rem;
    }

    .related-post-image {
        height: 200px;
    }
}

/* ─── ARTICLE BODY TYPOGRAPHY ─────────────────── */

#post-body p { font-size: 1.15rem; color: var(--muted); line-height: 1.3; margin-bottom: 0.5rem; font-weight: 300; }
#post-body h2 { font-family: var(--font-display); font-size: 2rem; font-weight: 700; letter-spacing: -0.01em; color: var(--bg-dark); margin: 2.5rem 0 1rem; line-height: 1.1; }
#post-body h3 { font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; letter-spacing: -0.01em; color: var(--bg-dark); margin: 2rem 0 0.75rem; }
#post-body ul, #post-body ol { margin: 0 0 1.75rem 1.5rem; color: #475569; font-size: 1.05rem; font-weight: 300; }
#post-body li { margin-bottom: 0.5rem; line-height: 1.75; }
#post-body strong { color: var(--text); font-weight: 500; }
#post-body a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(37,99,235,0.3); transition: border-color 0.2s; }
#post-body a:hover { border-color: var(--accent); }
#post-body blockquote { border-left: 3px solid var(--accent); margin: 2rem 0; padding: 1rem 1.5rem; background: var(--accent-dim); border-radius: 0 4px 4px 0; font-style: italic; color: var(--text); }

/* ─── LOADING / ERROR STATES ──────────────────── */

.state-loading, .state-error { text-align: center; padding: 6rem 2rem; color: var(--muted); }
.state-loading .spinner { width: 36px; height: 36px; border: 2px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; margin: 0 auto 1.5rem; }
@keyframes spin { to { transform: rotate(360deg); } }
.state-error h2 { font-family: var(--font-display); font-size: 2.5rem; color: var(--bg-dark); margin-bottom: 0.75rem; }

/* ─── BLOG POST HERO IMAGE ────────────────────── */
.post-hero-image {
    width: 100%;
    max-height: 480px;
    overflow: hidden;
    background: var(--border);
}
.post-hero-image img {
    width: 100%;
    height: 480px;
    object-fit: cover;
    display: block;
}

/* ─── RESPONSIVE ──────────────────────────────── */
/* .related-posts-grid was declared at both 900px and 768px with the
   same value — the 900px query already covers everything ≤768px,
   so the redundant 768px copy has been dropped rather than repeated. */

@media (max-width: 768px) {
    .article-header { padding: 8rem 1.5rem 2.5rem; }
    .article-body { padding: 2rem 1rem 0rem; width: 100%; max-width: 100%; }
    #post-title { font-size: clamp(2rem, 8vw, 3rem); }
    /* .post-hero-image img { height: 220px; } */
    .post-hero-image {
        max-width: 1200px;
        margin: 0 auto;
        border-radius: 20px;
        overflow: hidden;
        box-shadow:
            0 20px 40px rgba(0,0,0,0.08);
        transform: translateY(-30px);
    }

    .article-layout { display: block; }
    .article-toc { display: none; }
}