/* ==========================================================================
   知识库与深度教程专用样式 (css/knowledge.css)
   Vintage Audiophile Manual & Article Typography
   ========================================================================== */

@import url('style.css');

/* Knowledge Hub Page Styles */
.kb-hero-banner {
  background: linear-gradient(180deg, #1f1813 0%, #110e0b 100%);
  border-bottom: 2px solid var(--color-chassis-border);
  padding: 60px 0 40px;
  position: relative;
}

.kb-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.kb-breadcrumbs a {
  color: var(--color-amber-gold);
  text-decoration: none;
  transition: var(--trans-smooth);
}

.kb-breadcrumbs a:hover {
  text-decoration: underline;
}

.kb-hero-title {
  font-size: 2.6rem;
  font-family: var(--font-display);
  font-weight: 800;
  color: #fff;
  line-height: 1.25;
}

.kb-hero-desc {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 820px;
  margin-top: 14px;
}

/* Category Filter Bar */
.kb-filter-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 40px 0 30px;
  flex-wrap: wrap;
}

.kb-filter-btn {
  background: rgba(35, 28, 22, 0.8);
  border: 1px solid #4a3a2a;
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  padding: 8px 18px;
  border-radius: 20px;
  cursor: pointer;
  transition: var(--trans-smooth);
}

.kb-filter-btn.active, .kb-filter-btn:hover {
  background: var(--color-caramel);
  color: #fff;
  border-color: var(--color-amber-gold);
}

/* Articles Directory Grid */
.kb-articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-bottom: 80px;
}

.article-card-box {
  background: linear-gradient(160deg, #221c16 0%, #14110d 100%);
  border: 1px solid #443424;
  border-radius: 16px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
  transition: var(--trans-smooth);
  position: relative;
  text-decoration: none;
}

.article-card-box:hover {
  transform: translateY(-5px);
  border-color: var(--color-amber-gold);
  box-shadow: 0 15px 35px rgba(0,0,0,0.85), 0 0 20px rgba(200, 116, 36, 0.2);
}

.article-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.article-card-tag {
  background: rgba(168, 36, 36, 0.3);
  border: 1px solid var(--color-jazz-red);
  color: #ff9999;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
}

.article-read-time {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
}

.article-card-title {
  font-size: 1.3rem;
  font-family: var(--font-display);
  font-weight: 700;
  color: #fff;
  line-height: 1.4;
}

.article-card-summary {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.article-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid rgba(245, 175, 74, 0.15);
  padding-top: 14px;
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--color-amber-gold);
  font-weight: 600;
}

/* ==========================================================================
   Article Detail Page Typography & Layout
   ========================================================================== */
.article-detail-container {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  padding: 50px 0 80px;
}

/* Sticky Sidebar Table of Contents */
.article-sidebar {
  position: sticky;
  top: 110px;
  height: fit-content;
  background: #171310;
  border: 1px solid #3d3023;
  border-radius: 14px;
  padding: 22px;
}

.sidebar-title {
  font-size: 0.95rem;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-gold-bright);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  line-height: 1.4;
  transition: var(--trans-smooth);
  display: block;
  padding: 4px 8px;
  border-radius: 6px;
}

.toc-link:hover, .toc-link.active {
  color: var(--color-amber-gold);
  background: rgba(245, 175, 74, 0.1);
}

.sidebar-cta-card {
  margin-top: 24px;
  background: linear-gradient(145deg, #2a1f16 0%, #16120e 100%);
  border: 1px solid var(--color-caramel);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
}

.sidebar-cta-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.sidebar-cta-text {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

/* Article Main Content */
.article-main-content {
  background: linear-gradient(180deg, #1b1612 0%, #13100c 100%);
  border: 1px solid #3d2f22;
  border-radius: 18px;
  padding: 48px;
  box-shadow: 0 15px 40px rgba(0,0,0,0.8);
}

.article-header {
  border-bottom: 1px solid rgba(245, 175, 74, 0.2);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.article-main-title {
  font-size: 2.2rem;
  font-family: var(--font-display);
  font-weight: 800;
  color: #fff;
  line-height: 1.35;
  margin-bottom: 16px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Rich Article Body Typography */
.article-body {
  color: #ded6cb;
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-gold-bright);
  margin: 38px 0 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(245, 175, 74, 0.25);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin: 26px 0 14px;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin: 14px 0 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-body li {
  line-height: 1.75;
}

.article-callout {
  background: rgba(38, 29, 21, 0.8);
  border-left: 4px solid var(--color-amber-gold);
  border-radius: 0 10px 10px 0;
  padding: 18px 22px;
  margin: 26px 0;
}

.callout-title {
  font-weight: 700;
  color: var(--color-gold-bright);
  font-size: 0.98rem;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Styled Code Block */
.article-code-block {
  background: #0d0a08;
  border: 1px solid #3d3023;
  border-radius: 10px;
  padding: 18px 22px;
  margin: 22px 0;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #ffcf70;
  overflow-x: auto;
  line-height: 1.6;
}

/* Comparison Table */
.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  background: #15110d;
  border: 1px solid #443527;
  border-radius: 10px;
  font-size: 0.9rem;
}

.article-table th {
  background: #2a2017;
  color: var(--color-gold-bright);
  padding: 12px 16px;
  text-align: left;
  border-bottom: 2px solid #5a4533;
}

.article-table td {
  padding: 12px 16px;
  border-bottom: 1px solid #2e241b;
  color: var(--color-text-secondary);
}

.article-table tr:hover td {
  background: rgba(245, 175, 74, 0.05);
}

/* End Article Banner & Navigation */
.article-bottom-cta {
  background: linear-gradient(135deg, #2b1f15 0%, #3d2319 100%);
  border: 2px solid var(--color-amber-gold);
  border-radius: 14px;
  padding: 30px;
  margin-top: 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.prev-next-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 40px;
  border-top: 1px solid rgba(245, 175, 74, 0.2);
  padding-top: 25px;
}

.nav-card {
  background: #16120f;
  border: 1px solid #3d2f23;
  border-radius: 10px;
  padding: 16px 20px;
  text-decoration: none;
  transition: var(--trans-smooth);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nav-card:hover {
  border-color: var(--color-amber-gold);
  transform: translateY(-2px);
}

.nav-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.nav-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
}

@media (max-width: 900px) {
  .kb-articles-grid {
    grid-template-columns: 1fr;
  }
  .article-detail-container {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    position: static;
    margin-bottom: 30px;
  }
  .article-bottom-cta {
    flex-direction: column;
    text-align: center;
  }
}