/* ═══════════════════════════════════════════════════════════════════════════
   BLOG — Article reading styles, TOC, progress bar, nav articles
   ═══════════════════════════════════════════════════════════════════════════ */

/* ─── Reading Progress Bar ─── */
.blog-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--gradient-purple);
  z-index: 100002;
  transition: width 0.1s linear;
}

/* ─── Article Container ─── */
.blog-article {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

.blog-article__header {
  margin-bottom: 3rem;
}

.blog-article__tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.blog-article__meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary, #94a3b8);
  margin-bottom: 1.5rem;
}

.blog-article__title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.blog-article__excerpt {
  font-size: 1.1rem;
  color: var(--text-secondary, #94a3b8);
  line-height: 1.7;
  border-left: 3px solid var(--purple);
  padding-left: 1rem;
}

/* ─── Table of Contents ─── */
.blog-toc {
  background: rgba(139, 92, 246, 0.04);
  border: 1px solid rgba(139, 92, 246, 0.1);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 3rem;
}

.blog-toc__title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--purple);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.blog-toc__list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.blog-toc__link {
  font-size: 0.9rem;
  color: var(--text-secondary, #94a3b8);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: all 0.2s;
  display: block;
}

.blog-toc__link:hover {
  color: var(--purple);
  background: rgba(139, 92, 246, 0.08);
}

.blog-toc__link.active {
  color: var(--purple);
  background: rgba(139, 92, 246, 0.1);
}

/* ─── Article Content ─── */
.blog-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  color: var(--text-primary);
  scroll-margin-top: 100px;
}

.blog-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  color: var(--text-primary);
}

.blog-content p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-secondary, #cbd5e1);
  margin-bottom: 1.25rem;
}

.blog-content ul,
.blog-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

.blog-content li {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary, #cbd5e1);
  margin-bottom: 0.4rem;
}

.blog-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.blog-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: rgba(139, 92, 246, 0.1);
  color: #c084fc;
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.blog-content blockquote {
  border-left: 3px solid var(--purple);
  padding: 0.75rem 1rem;
  margin: 1.5rem 0;
  background: rgba(139, 92, 246, 0.04);
  border-radius: 0 8px 8px 0;
}

.blog-content blockquote p {
  margin-bottom: 0;
  font-style: italic;
}

/* ─── Code Blocks with Copy Button ─── */
.blog-code-block {
  position: relative;
  margin: 1.5rem 0;
}

.blog-code-block .code-block__copy {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: rgba(139, 92, 246, 0.15);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: 6px;
  padding: 0.3rem 0.6rem;
  color: var(--text-secondary, #94a3b8);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  cursor: pointer;
  transition: all 0.2s;
  z-index: 2;
}

.blog-code-block .code-block__copy:hover {
  background: rgba(139, 92, 246, 0.25);
  color: var(--text-primary);
}

/* ─── Article Navigation ─── */
.blog-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(139, 92, 246, 0.1);
}

.blog-nav__item {
  padding: 1rem;
  border: 1px solid rgba(139, 92, 246, 0.1);
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.2s;
}

.blog-nav__item:hover {
  border-color: rgba(139, 92, 246, 0.3);
  background: rgba(139, 92, 246, 0.04);
}

.blog-nav__item--next {
  text-align: right;
}

.blog-nav__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary, #64748b);
  display: block;
  margin-bottom: 0.25rem;
}

.blog-nav__title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ─── Responsive ─── */
@media (max-width: 640px) {
  .blog-article {
    padding: 1rem 0 3rem;
  }
  .blog-nav {
    grid-template-columns: 1fr;
  }
  .blog-nav__item--next {
    text-align: left;
  }
}

/* ─── Blog Index Grid ─── */
.blog-index { padding: 4rem 0 6rem; }

.blog-filters {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  margin-bottom: 2.5rem; max-width: 1000px;
  margin-left: auto; margin-right: auto;
}

.blog-filter {
  background: var(--glass-bg, rgba(255,255,255,0.03));
  border: 1px solid var(--glass-border, rgba(255,255,255,0.06));
  border-radius: 8px; padding: 0.45rem 1rem;
  font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--text-secondary, #94a3b8); cursor: pointer;
  transition: all 0.2s ease;
}
.blog-filter:hover { border-color: rgba(139,92,246,0.3); color: var(--text-primary); }
.blog-filter.active { background: rgba(139,92,246,0.12); border-color: rgba(139,92,246,0.4); color: var(--purple); }

.blog-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem; max-width: 1000px; margin: 0 auto;
}

.blog-card {
  background: var(--glass-bg, rgba(255,255,255,0.03));
  border: 1px solid var(--glass-border, rgba(255,255,255,0.06));
  border-radius: 16px; padding: 1.5rem;
  display: flex; flex-direction: column; gap: 0.75rem;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
  text-decoration: none; color: inherit;
}
.blog-card:hover { border-color: rgba(139,92,246,0.2); box-shadow: 0 0 30px rgba(139,92,246,0.06); transform: translateY(-2px); }
.blog-card.hidden { display: none; }

.blog-card__category {
  font-family: var(--font-mono); font-size: 0.7rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--purple); padding: 0.15rem 0.5rem;
  background: rgba(139,92,246,0.1); border: 1px solid rgba(139,92,246,0.2);
  border-radius: 4px; width: fit-content;
}

.blog-card__title {
  font-size: 1.1rem; font-weight: 700; color: var(--text-primary);
  line-height: 1.3;
}

.blog-card__desc {
  font-size: 0.85rem; color: var(--text-secondary, #94a3b8);
  line-height: 1.6; flex: 1;
}

.blog-card__meta {
  display: flex; align-items: center; gap: 1rem;
  font-family: var(--font-mono); font-size: 0.72rem;
  color: var(--text-secondary, #64748b);
}

.blog-card__link {
  font-family: var(--font-mono); font-size: 0.78rem; font-weight: 600;
  color: var(--purple); text-decoration: none;
  transition: color 0.2s;
}
.blog-card__link:hover { color: var(--pink, #ec4899); }

@media (max-width: 768px) { .blog-grid { grid-template-columns: 1fr; } }

[data-theme="light"] .blog-card { background: rgba(0,0,0,0.02); border-color: rgba(0,0,0,0.08); }
[data-theme="light"] .blog-card:hover { border-color: rgba(139,92,246,0.25); }

/* ─── Social Sharing ─── */
.blog-share { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--glass-border, rgba(255,255,255,0.06)); }
.blog-share__label { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-secondary); display: block; margin-bottom: 0.75rem; }
.blog-share__buttons { display: flex; gap: 0.5rem; }
.blog-share__btn { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--glass-border, rgba(255,255,255,0.06)); background: var(--glass-bg, rgba(255,255,255,0.03)); color: var(--text-secondary); cursor: pointer; transition: all 0.2s; text-decoration: none; }
.blog-share__btn:hover { border-color: rgba(139,92,246,0.3); color: var(--purple); transform: translateY(-2px); }
.blog-share__btn--twitter:hover { color: #1da1f2; }
.blog-share__btn--linkedin:hover { color: #0077b5; }
.blog-share__btn--copy:hover { color: #22c55e; }

/* ─── Giscus Comments ─── */
.blog-comments { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--glass-border, rgba(255,255,255,0.06)); }
.blog-comments__title { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.75rem; }
.blog-comments__note { font-size: 0.82rem; color: var(--text-secondary); margin-bottom: 1.5rem; }
.blog-comments__note a { color: var(--purple); text-decoration: none; }
.blog-comments__placeholder { display: flex; flex-direction: column; align-items: center; gap: 0.75rem; padding: 2rem; border-radius: 12px; background: var(--glass-bg, rgba(255,255,255,0.03)); border: 1px dashed var(--glass-border, rgba(255,255,255,0.1)); text-align: center; }
.blog-comments__placeholder p { font-size: 0.82rem; color: var(--text-secondary); }

/* ─── Related Articles ─── */
.blog-related { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--glass-border, rgba(255,255,255,0.06)); }
.blog-related__title { font-size: 1.1rem; font-weight: 700; margin-bottom: 1rem; }
.blog-related__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.blog-related__card { display: flex; flex-direction: column; gap: 0.5rem; padding: 1.25rem; border-radius: 12px; background: var(--glass-bg, rgba(255,255,255,0.03)); border: 1px solid var(--glass-border, rgba(255,255,255,0.06)); text-decoration: none; color: inherit; transition: all 0.2s; }
.blog-related__card:hover { border-color: rgba(139,92,246,0.3); transform: translateY(-2px); }
.blog-related__category { font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; color: var(--purple); }
.blog-related__name { font-size: 0.9rem; font-weight: 600; color: var(--text-primary); }
@media (max-width: 640px) { .blog-related__grid { grid-template-columns: 1fr; } }