/* blog.css — Blog listing page styles */

/* PAGE HERO */
.page-hero {
  padding: 7rem 0 3.5rem;
  background: linear-gradient(180deg, rgba(56,29,146,0.03) 0%, transparent 100%);
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.page-hero-content h1 { font-size: clamp(2rem, 5vw, 3.2rem); margin: 1rem 0 0.75rem; }
.page-hero-content p { color: var(--text-secondary); max-width: 580px; margin: 0 auto; font-size: 1.05rem; }

/* BLOG PAGE LAYOUT */
.blog-page-section { padding: 2.5rem 0 5rem; }
.blog-page-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2rem;
  align-items: start;
}

/* FILTER BAR */
.filter-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.filter-tabs {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  flex: 1;
}
.filter-btn {
  padding: 0.45rem 1rem;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 100px;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
}
.filter-btn:hover { color: var(--text-primary); border-color: var(--border-accent); }
.filter-btn.active { background: var(--grad-cyan-purple); color: #fff; border-color: transparent; }

.sort-select {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  outline: none;
}

/* ARTICLE CARDS */
.articles-list { display: flex; flex-direction: column; gap: 1rem; }

.article-card {
  background: var(--bg-card-main);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  gap: 1.25rem;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
}
.article-card:hover { border-color: var(--border-accent); transform: translateY(-2px); box-shadow: var(--shadow-card-hover); }

.ac-left { flex-shrink: 0; }
.ac-icon {
  width: 54px; height: 54px;
  background: rgba(56,29,146,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
}

.ac-right { flex: 1; min-width: 0; }
.ac-meta-top {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
}

.difficulty-badge {
  padding: 0.18rem 0.6rem;
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 700;
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.diff-begin { background: rgba(5,150,105,0.1); color: var(--green); }
.diff-inter { background: rgba(202,138,4,0.1); color: #ca8a04; }
.diff-adv { background: rgba(220,38,38,0.1); color: var(--red); }

.ac-title { font-size: 1.05rem; margin-bottom: 0.5rem; line-height: 1.4; }
.ac-title a { color: var(--text-primary); }
.ac-title a:hover { color: var(--purple); }
.ac-excerpt { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.65; margin-bottom: 1rem; }

.ac-footer {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}
.ac-stats { display: flex; gap: 1rem; margin-left: auto; }
.ac-stats span { color: var(--text-muted); font-size: 0.78rem; font-family: var(--font-mono); }

/* PAGINATION */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}
.pg-btn {
  min-width: 40px; height: 40px;
  padding: 0 0.75rem;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex; align-items: center; justify-content: center;
}
.pg-btn:hover:not(:disabled) { border-color: var(--border-accent); color: var(--purple); }
.pg-btn.active { background: var(--grad-cyan-purple); color: #fff; border-color: transparent; }
.pg-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.pg-dots { color: var(--text-muted); padding: 0 0.25rem; }

/* SIDEBAR */
.blog-sidebar {
  position: sticky;
  top: 80px;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.sidebar-widget {
  background: var(--bg-card-main);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
}
.widget-title {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}

/* Sidebar Search */
.sidebar-search { display: flex; gap: 0.5rem; }
.sidebar-search-input {
  flex: 1;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  outline: none;
}
.sidebar-search-input:focus { border-color: var(--purple); }
.sidebar-search-btn {
  background: rgba(56,29,146,0.08);
  border: 1px solid var(--border-accent);
  color: var(--purple);
  width: 38px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
  transition: var(--transition-fast);
}
.sidebar-search-btn:hover { background: rgba(56,29,146,0.15); }

/* Popular List */
.popular-list { display: flex; flex-direction: column; gap: 0.85rem; }
.popular-list li a {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.4;
  transition: var(--transition-fast);
}
.popular-list li a:hover { color: var(--purple); }
.pop-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--purple);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* Category List */
.cat-list { display: flex; flex-direction: column; gap: 0.5rem; }
.cat-list li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-secondary);
  font-size: 0.875rem;
  padding: 0.35rem 0;
  transition: var(--transition-fast);
  border-bottom: 1px solid rgba(11,6,32,0.05);
}
.cat-list li a:hover { color: var(--purple); }
.cat-list li a span {
  background: rgba(56,29,146,0.05);
  color: var(--text-muted);
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 0.15rem 0.5rem;
  border-radius: 100px;
}

/* Tag Cloud */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tc-tag {
  background: rgba(56,29,146,0.04);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.25rem 0.7rem;
  border-radius: 100px;
  font-size: 0.75rem;
  transition: var(--transition-fast);
}
.tc-tag:hover { background: rgba(56,29,146,0.08); border-color: var(--border-accent); color: var(--purple); }

/* Sidebar Newsletter */
.sidebar-newsletter p { color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 0.85rem; }
.mini-nl-form { display: flex; flex-direction: column; gap: 0.6rem; }

/* RESPONSIVE */
@media (max-width: 1024px) {
  .blog-page-layout { grid-template-columns: 1fr; }
  .blog-sidebar { position: static; }
  .ads-sidebar-slot { width: 100%; height: 120px; }
}
@media (max-width: 640px) {
  .article-card { flex-direction: column; }
  .ac-left { display: none; }
  .filter-tabs { gap: 0.3rem; }
  .filter-btn { font-size: 0.75rem; padding: 0.35rem 0.7rem; }
}