/* ============================================================
   GitImsi Knowledge Base & Hub — Page-Specific Styles
   ============================================================ */

/* --- Hero Section --- */
.kb-hero {
  padding: var(--space-5xl) 0 var(--space-3xl);
  position: relative;
  overflow: hidden;
  text-align: center;
}

.kb-hero .hero-glow-orb.indigo {
  width: 500px;
  height: 500px;
  top: -150px;
  right: 10%;
}

.kb-hero .hero-glow-orb.emerald {
  width: 350px;
  height: 350px;
  bottom: -80px;
  left: 5%;
}

.kb-hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
  margin: 0 auto;
}

.kb-hero-title {
  margin-bottom: var(--space-lg);
}

.kb-hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.15rem;
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Search Bar --- */
.kb-search-wrapper {
  position: relative;
  max-width: 620px;
  margin: 0 auto;
}

.kb-search-icon {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
  transition: color var(--transition-fast);
  z-index: 2;
}

.kb-search-input {
  width: 100%;
  padding: 18px 60px 18px 56px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  color: var(--text-primary);
  font-size: 1.05rem;
  font-family: var(--font-sans);
  transition: all var(--transition-base);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.kb-search-input::placeholder {
  color: var(--text-tertiary);
}

.kb-search-input:focus {
  border-color: var(--accent-indigo);
  box-shadow: 0 0 0 3px var(--accent-indigo-muted), var(--shadow-glow-indigo);
  outline: none;
}

.kb-search-input:focus ~ .kb-search-icon {
  color: var(--accent-indigo-glow);
}

.kb-search-clear {
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: none;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 2;
}

.kb-search-clear:hover {
  background: var(--accent-indigo-muted);
  color: var(--text-primary);
}

.kb-search-clear.visible {
  display: flex;
}

.kb-search-meta {
  margin-top: var(--space-md);
  font-size: 0.85rem;
  color: var(--text-tertiary);
  min-height: 1.4em;
}

.kb-search-meta .highlight {
  color: var(--accent-indigo-glow);
  font-weight: var(--font-weight-semibold);
}

/* --- Category Navigation --- */
.kb-categories {
  padding: var(--space-lg) 0 var(--space-xl);
  position: sticky;
  top: 72px;
  z-index: var(--z-sticky);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-base);
}

.kb-categories::before {
  content: '';
  position: absolute;
  inset: 0;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: -1;
}

.kb-category-tabs {
  display: flex;
  gap: 6px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.kb-category-tabs::-webkit-scrollbar {
  display: none;
}

.kb-category-tab {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 20px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: var(--font-weight-medium);
  color: var(--text-tertiary);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.kb-category-tab:hover {
  color: var(--text-secondary);
  background: var(--accent-indigo-soft);
}

.kb-category-tab.active {
  background: var(--accent-indigo);
  color: white;
  border-color: var(--accent-indigo);
  box-shadow: 0 2px 12px rgba(99, 102, 241, 0.35);
}

.kb-category-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: var(--font-weight-bold);
  background: rgba(255, 255, 255, 0.1);
  color: inherit;
}

.kb-category-tab.active .kb-category-count {
  background: rgba(255, 255, 255, 0.25);
}

/* --- Featured Article --- */
.kb-featured {
  padding: var(--space-3xl) 0;
}

.kb-featured-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  overflow: hidden;
  padding: 0;
}

.kb-featured-thumb {
  position: relative;
  min-height: 320px;
  background: linear-gradient(135deg,
    rgba(99, 102, 241, 0.2) 0%,
    rgba(16, 185, 129, 0.15) 40%,
    rgba(245, 158, 11, 0.1) 70%,
    rgba(99, 102, 241, 0.1) 100%
  );
  background-size: 200% 200%;
  animation: gradient-shift 8s ease-in-out infinite;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.kb-featured-thumb-inner {
  position: relative;
  width: 200px;
  height: 200px;
}

.kb-featured-icon-ring {
  position: absolute;
  inset: 0;
  border: 2px dashed rgba(99, 102, 241, 0.3);
  border-radius: 50%;
  animation: rotate-slow 30s linear infinite;
}

.kb-featured-icon-ring:nth-child(2) {
  inset: 20px;
  border-color: rgba(16, 185, 129, 0.25);
  animation-direction: reverse;
  animation-duration: 25s;
}

.kb-featured-icon-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, var(--accent-indigo), var(--accent-emerald));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow-indigo);
}

.kb-featured-icon-center svg {
  width: 36px;
  height: 36px;
  color: white;
}

.kb-featured-body {
  padding: var(--space-3xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.kb-featured-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.75rem;
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-amber-glow);
  margin-bottom: var(--space-lg);
}

.kb-featured-label svg {
  width: 14px;
  height: 14px;
}

.kb-featured-category {
  display: inline-block;
  padding: 4px 12px;
  background: var(--accent-indigo-muted);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: var(--font-weight-semibold);
  color: var(--accent-indigo-glow);
  margin-bottom: var(--space-md);
}

.kb-featured-title {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: var(--font-weight-bold);
  line-height: 1.3;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.kb-featured-excerpt {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

.kb-featured-meta {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.kb-author {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.kb-author-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: var(--font-weight-bold);
  color: white;
  flex-shrink: 0;
}

.kb-author-avatar.indigo { background: linear-gradient(135deg, var(--accent-indigo), var(--accent-indigo-deep)); }
.kb-author-avatar.emerald { background: linear-gradient(135deg, var(--accent-emerald), var(--accent-emerald-deep)); }
.kb-author-avatar.amber { background: linear-gradient(135deg, var(--accent-amber), var(--accent-amber-deep)); }

.kb-author-name {
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
}

.kb-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.kb-meta-item svg {
  width: 14px;
  height: 14px;
  opacity: 0.7;
}

.kb-featured-cta {
  margin-top: var(--space-xl);
}

/* --- Article Grid --- */
.kb-articles {
  padding: var(--space-xl) 0 var(--space-5xl);
}

.kb-grid-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
  gap: var(--space-md);
}

.kb-grid-title {
  font-size: 1.3rem;
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

.kb-grid-count {
  color: var(--text-tertiary);
  font-size: 0.85rem;
}

.kb-sort-select {
  padding: 8px 36px 8px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='12' viewBox='0 0 12 12' fill='%2394a3b8' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M2 4L6 8L10 4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  transition: all var(--transition-fast);
}

.kb-sort-select:focus {
  border-color: var(--accent-indigo);
  box-shadow: 0 0 0 2px var(--accent-indigo-muted);
  outline: none;
}

.kb-article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

/* --- Article Card --- */
.kb-article-card {
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow: hidden;
  cursor: pointer;
}

.kb-article-card .card-content {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.kb-article-thumb {
  height: 180px;
  position: relative;
  overflow: hidden;
}

.kb-article-thumb-gradient {
  width: 100%;
  height: 100%;
  transition: transform var(--transition-slow);
}

.kb-article-card:hover .kb-article-thumb-gradient {
  transform: scale(1.05);
}

/* Unique gradient combos for visual variety */
.kb-article-thumb-gradient.grad-1 {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.25) 0%, rgba(16, 185, 129, 0.15) 100%);
}
.kb-article-thumb-gradient.grad-2 {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.2) 0%, rgba(99, 102, 241, 0.2) 100%);
}
.kb-article-thumb-gradient.grad-3 {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.25) 0%, rgba(245, 158, 11, 0.15) 100%);
}
.kb-article-thumb-gradient.grad-4 {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(245, 158, 11, 0.2) 100%);
}
.kb-article-thumb-gradient.grad-5 {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.2) 0%, rgba(99, 102, 241, 0.2) 100%);
}
.kb-article-thumb-gradient.grad-6 {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.25) 0%, rgba(16, 185, 129, 0.15) 100%);
}

.kb-article-thumb-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.15;
}

.kb-article-thumb-pattern svg {
  width: 100%;
  height: 100%;
}

.kb-article-body {
  padding: var(--space-xl);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.kb-article-category {
  display: inline-flex;
  align-self: flex-start;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.kb-article-category.cat-seo {
  background: var(--accent-indigo-muted);
  color: var(--accent-indigo-glow);
}

.kb-article-category.cat-marketing {
  background: var(--accent-emerald-muted);
  color: var(--accent-emerald-glow);
}

.kb-article-category.cat-automation {
  background: var(--accent-amber-muted);
  color: var(--accent-amber-glow);
}

.kb-article-category.cat-development {
  background: rgba(244, 114, 182, 0.15);
  color: #f472b6;
}

.kb-article-category.cat-case-analysis {
  background: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
}

.kb-article-category.cat-tutorials {
  background: rgba(168, 85, 247, 0.15);
  color: #a855f7;
}

.kb-article-title {
  font-size: 1.05rem;
  font-weight: var(--font-weight-semibold);
  line-height: 1.4;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
  transition: color var(--transition-fast);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.kb-article-card:hover .kb-article-title {
  color: var(--accent-indigo-glow);
}

.kb-article-excerpt {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.kb-article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-subtle);
  gap: var(--space-sm);
}

.kb-article-author {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.kb-article-author-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: var(--font-weight-bold);
  color: white;
  flex-shrink: 0;
}

.kb-article-author-name {
  font-size: 0.8rem;
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
}

.kb-article-date {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  white-space: nowrap;
}

.kb-article-read-time {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  white-space: nowrap;
}

.kb-article-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  padding: 0 var(--space-xl) var(--space-lg);
}

.kb-article-tag {
  padding: 2px 8px;
  background: var(--accent-indigo-soft);
  border-radius: var(--radius-sm);
  font-size: 0.65rem;
  color: var(--text-tertiary);
  font-weight: var(--font-weight-medium);
}

/* --- No Results State --- */
.kb-no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-5xl) var(--space-xl);
}

.kb-no-results-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-xl);
  border-radius: 50%;
  background: var(--accent-indigo-muted);
  display: flex;
  align-items: center;
  justify-content: center;
}

.kb-no-results-icon svg {
  width: 36px;
  height: 36px;
  color: var(--accent-indigo-glow);
}

.kb-no-results h3 {
  font-size: 1.3rem;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.kb-no-results p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* --- Related Topics Section --- */
.kb-related {
  padding: var(--space-5xl) 0;
  background: var(--bg-secondary);
}

.kb-related-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}

.kb-topics-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.kb-topic-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: var(--glass-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.kb-topic-tag:hover {
  background: var(--accent-indigo-muted);
  border-color: var(--accent-indigo);
  color: var(--accent-indigo-glow);
  transform: translateY(-2px);
}

.kb-topic-tag.featured {
  background: var(--accent-indigo-muted);
  border-color: var(--glass-border);
  color: var(--accent-indigo-glow);
  font-weight: var(--font-weight-semibold);
}

.kb-series-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.kb-series-card {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--glass-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.kb-series-card:hover {
  border-color: var(--accent-indigo);
  background: var(--accent-indigo-soft);
  transform: translateX(4px);
}

.kb-series-number {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
  font-family: var(--font-mono);
}

.kb-series-number.indigo {
  background: var(--accent-indigo-muted);
  color: var(--accent-indigo-glow);
}

.kb-series-number.emerald {
  background: var(--accent-emerald-muted);
  color: var(--accent-emerald-glow);
}

.kb-series-number.amber {
  background: var(--accent-amber-muted);
  color: var(--accent-amber-glow);
}

.kb-series-info h4 {
  font-size: 0.95rem;
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: 2px;
}

.kb-series-info p {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.kb-series-arrow {
  margin-left: auto;
  color: var(--text-tertiary);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.kb-series-card:hover .kb-series-arrow {
  color: var(--accent-indigo-glow);
  transform: translateX(4px);
}

/* --- Newsletter Section --- */
.kb-newsletter {
  padding: var(--space-5xl) 0;
}

.kb-newsletter-card {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  padding: var(--space-3xl);
}

.kb-newsletter-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-xl);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--accent-indigo-muted), var(--accent-emerald-muted));
  display: flex;
  align-items: center;
  justify-content: center;
}

.kb-newsletter-icon svg {
  width: 28px;
  height: 28px;
  color: var(--accent-indigo-glow);
}

.kb-newsletter-title {
  font-size: 1.6rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-sm);
}

.kb-newsletter-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--space-xl);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.kb-newsletter-form {
  display: flex;
  gap: var(--space-sm);
  max-width: 460px;
  margin: 0 auto;
}

.kb-newsletter-input {
  flex: 1;
  padding: 14px 20px;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.kb-newsletter-input::placeholder {
  color: var(--text-tertiary);
}

.kb-newsletter-input:focus {
  border-color: var(--accent-indigo);
  box-shadow: 0 0 0 3px var(--accent-indigo-muted);
  outline: none;
}

.kb-newsletter-input.error {
  border-color: #ef4444;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.kb-newsletter-feedback {
  margin-top: var(--space-md);
  font-size: 0.85rem;
  min-height: 1.3em;
}

.kb-newsletter-feedback.success {
  color: var(--accent-emerald-glow);
}

.kb-newsletter-feedback.error {
  color: #ef4444;
}

.kb-newsletter-note {
  margin-top: var(--space-md);
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .kb-article-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .kb-featured-card {
    grid-template-columns: 1fr;
  }

  .kb-featured-thumb {
    min-height: 220px;
  }

  .kb-related-grid {
    grid-template-columns: 1fr;
  }
}

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

  .kb-hero {
    padding: var(--space-3xl) 0 var(--space-2xl);
  }

  .kb-featured-body {
    padding: var(--space-xl);
  }

  .kb-newsletter-form {
    flex-direction: column;
  }

  .kb-newsletter-form .btn {
    width: 100%;
  }

  .kb-grid-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .kb-categories {
    top: 72px;
  }

  .kb-category-tabs {
    padding: 0 var(--space-md);
  }
}

@media (max-width: 480px) {
  .kb-featured-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}

/* --- 480px Mobile --- */
@media (max-width: 480px) {
    .kb-article-grid { grid-template-columns: 1fr !important; }
    .kb-featured-card { grid-template-columns: 1fr !important; }
    .kb-related-grid { grid-template-columns: 1fr !important; }
    .kb-search-input { font-size: 0.85rem; padding: 12px 16px; }
}