/* ═══════════════════════════════════════════════════════════════════
   BLOG STYLES — api4trading.com/blog
   Extends /en/style.css — inherits all design tokens
   ═══════════════════════════════════════════════════════════════════ */

/* ── Nav active state ─────────────────────────────────────────── */
.blog-nav-active {
  color: var(--text-primary) !important;
  position: relative;
}
.blog-nav-active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--primary-glow);
}

/* ── Blog Hero ────────────────────────────────────────────────── */
.blog-hero {
  position: relative;
  padding: 180px 0 100px;
  overflow: hidden;
  text-align: center;
}

.blog-hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(59,130,246,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 30%, rgba(99,102,241,0.08) 0%, transparent 50%);
  pointer-events: none;
}

/* Subtle grid overlay */
.blog-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, black 20%, transparent 80%);
  mask-image: radial-gradient(ellipse at 50% 0%, black 20%, transparent 80%);
  pointer-events: none;
}

.blog-hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
  margin: 0 auto;
}

.blog-hero h1 {
  font-size: 64px;
  letter-spacing: -0.04em;
  margin: 16px 0 20px;
  line-height: 1.05;
}

.blog-hero p {
  font-size: 20px;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 48px;
}

/* ── Search ───────────────────────────────────────────────────── */
.blog-search-wrap {
  position: relative;
  max-width: 520px;
  margin: 0 auto;
}

.blog-search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 15px;
  pointer-events: none;
}

.blog-search {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: 50px;
  padding: 14px 52px 14px 48px;
  color: var(--text-primary);
  font-size: 15px;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  appearance: none;
}

.blog-search::placeholder { color: var(--text-muted); }

.blog-search:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

.blog-search-kbd {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 2px 7px;
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  pointer-events: none;
}

/* ── Filter Bar ───────────────────────────────────────────────── */
.blog-filter-bar {
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-surface);
  position: sticky;
  top: 72px;
  z-index: 50;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.blog-filter-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0;
  min-height: 56px;
  gap: 20px;
  overflow-x: auto;
  scrollbar-width: none;
}
.blog-filter-inner::-webkit-scrollbar { display: none; }

.blog-filter-tabs {
  display: flex;
  gap: 4px;
  align-items: center;
  flex-shrink: 0;
}

.blog-filter-tab {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 16px;
  border-radius: 50px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
  font-family: var(--font-sans);
}

.blog-filter-tab .tab-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.5;
  transition: opacity 0.2s;
}

.blog-filter-tab:hover {
  background: var(--border-light);
  color: var(--text-primary);
}

.blog-filter-tab.active {
  background: rgba(59,130,246,0.12);
  color: var(--primary);
  font-weight: 600;
}

.blog-filter-tab.active .tab-dot {
  opacity: 1;
}

.blog-stats {
  font-size: 13px;
  color: var(--text-muted);
  flex-shrink: 0;
  white-space: nowrap;
}

/* ── Featured Card ────────────────────────────────────────────── */
.blog-featured-section {
  padding: 64px 0 0;
}

.blog-featured-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.4s cubic-bezier(0.22,1,0.36,1), box-shadow 0.4s ease, border-color 0.3s;
  text-decoration: none;
  color: inherit;
}

.blog-featured-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 0 24px 64px rgba(0,0,0,0.45);
}

.blog-featured-img {
  position: relative;
  overflow: hidden;
  min-height: 340px;
  background: linear-gradient(135deg, #0C1120 0%, #111827 100%);
}

.blog-featured-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.22,1,0.36,1);
}

.blog-featured-card:hover .blog-featured-img img {
  transform: scale(1.04);
}

/* Placeholder graphic when no image */
.blog-img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0a0f1e 0%, #111827 100%);
  font-size: 80px;
  color: rgba(59,130,246,0.12);
  min-height: 340px;
  position: relative;
  overflow: hidden;
}

.blog-img-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
}

.blog-img-placeholder i {
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 0 30px rgba(59,130,246,0.4));
}

.blog-featured-badge {
  position: absolute;
  top: 20px;
  left: 20px;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 5px 12px;
  border-radius: 20px;
  box-shadow: 0 4px 12px rgba(59,130,246,0.4);
  z-index: 2;
}

.blog-featured-body {
  padding: 52px 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.blog-card-cat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid;
}

.blog-card-date, .blog-card-read {
  font-size: 13px;
  color: var(--text-muted);
}

.blog-featured-body h2 {
  font-size: 32px;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 16px;
  transition: color 0.2s;
}

.blog-featured-card:hover .blog-featured-body h2 {
  color: var(--primary);
}

.blog-featured-body p {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
}

.blog-featured-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  transition: gap 0.2s;
}

.blog-featured-card:hover .blog-featured-cta {
  gap: 14px;
}

/* ── Article Grid ─────────────────────────────────────────────── */
.blog-grid-section {
  padding: 64px 0 80px;
}

.blog-grid-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
}

.blog-grid-title {
  font-size: 28px;
  letter-spacing: -0.03em;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

/* ── Article Card ─────────────────────────────────────────────── */
.blog-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  transition: transform 0.4s cubic-bezier(0.22,1,0.36,1), box-shadow 0.4s ease, border-color 0.3s;
  position: relative;
}

.blog-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.blog-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: 0 20px 50px rgba(0,0,0,0.45);
}

.blog-card:hover::before {
  opacity: 1;
}

.blog-card-img {
  height: 200px;
  overflow: hidden;
  position: relative;
  background: var(--bg-elevated);
  flex-shrink: 0;
}

.blog-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.22,1,0.36,1);
}

.blog-card:hover .blog-card-img img {
  transform: scale(1.05);
}

.blog-card-img .blog-img-placeholder {
  font-size: 48px;
  min-height: 200px;
}

.blog-card-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.blog-card-body h3 {
  font-size: 18px;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin: 12px 0 10px;
  transition: color 0.2s;
}

.blog-card:hover h3 {
  color: var(--primary);
}

.blog-card-excerpt {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
}

.blog-card-author {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.blog-card-author-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.blog-read-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 5px;
  transition: gap 0.2s;
}

.blog-card:hover .blog-read-link {
  gap: 9px;
}

/* ── Empty State ──────────────────────────────────────────────── */
.blog-empty {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-secondary);
}

.blog-empty i {
  font-size: 48px;
  color: var(--text-muted);
  margin-bottom: 24px;
  display: block;
}

.blog-empty h3 {
  font-size: 24px;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.blog-empty p {
  font-size: 16px;
  margin-bottom: 32px;
}

/* ── Load More ────────────────────────────────────────────────── */
.blog-load-more-wrap {
  text-align: center;
  margin-top: 56px;
}

.blog-load-more {
  padding: 14px 40px;
  font-size: 15px;
  gap: 10px;
}

.blog-load-more i {
  font-size: 13px;
}

/* ── CTA Section ──────────────────────────────────────────────── */
.blog-cta-section {
  position: relative;
  padding: 100px 0;
  text-align: center;
  overflow: hidden;
}

.blog-cta-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59,130,246,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.blog-cta-content {
  position: relative;
  z-index: 2;
}

.blog-cta-content h2 {
  font-size: 48px;
  letter-spacing: -0.03em;
  margin: 16px 0 20px;
}

.blog-cta-content p {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.blog-cta-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Article Page (shared) ────────────────────────────────────── */
.article-header-section {
  padding: 160px 0 60px;
  position: relative;
  overflow: hidden;
}

.article-header-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 50% at 50% 0%, rgba(59,130,246,0.1) 0%, transparent 60%);
  pointer-events: none;
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.article-breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.article-breadcrumb a:hover { color: var(--primary); }

.article-breadcrumb i { font-size: 10px; }

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.article-header-title {
  font-size: 52px;
  letter-spacing: -0.04em;
  line-height: 1.1;
  max-width: 860px;
  margin-bottom: 24px;
}

.article-header-excerpt {
  font-size: 20px;
  color: var(--text-secondary);
  max-width: 700px;
  line-height: 1.6;
  margin-bottom: 48px;
}

.article-author-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 32px;
  border-top: 1px solid var(--border-light);
}

.article-author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  color: #fff;
  flex-shrink: 0;
}

.article-author-name {
  font-size: 15px;
  font-weight: 600;
}

.article-author-info {
  font-size: 13px;
  color: var(--text-muted);
}

/* Article Cover Image */
.article-cover-wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px 64px;
}

.article-cover-img {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  display: block;
  overflow: hidden;
}

/* Article Content Area */
.article-layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px 100px;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 64px;
  align-items: start;
}

.article-body {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* Article Typography */
.article-body h2 {
  font-size: 30px;
  color: var(--text-primary);
  margin: 56px 0 20px;
  letter-spacing: -0.03em;
  scroll-margin-top: 100px;
}

.article-body h3 {
  font-size: 22px;
  color: var(--text-primary);
  margin: 40px 0 16px;
  letter-spacing: -0.02em;
  scroll-margin-top: 100px;
}

.article-body p { margin-bottom: 24px; }

.article-body a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body ul, .article-body ol {
  padding-left: 24px;
  margin-bottom: 24px;
}

.article-body li { margin-bottom: 8px; }

.article-body img {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  margin: 32px 0;
}

.article-body blockquote {
  border-left: 3px solid var(--primary);
  padding: 16px 24px;
  margin: 32px 0;
  background: rgba(59,130,246,0.06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-primary);
  font-style: italic;
}

.article-body pre {
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  overflow-x: auto;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-elevated);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-light);
  color: var(--primary);
}

.article-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text-secondary);
}

/* Article Sidebar */
.article-sidebar {
  position: sticky;
  top: 100px;
}

.article-toc {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-bottom: 24px;
}

.article-toc h4 {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.article-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.article-toc-list li {
  margin-bottom: 8px;
}

.article-toc-list a {
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
  display: block;
  padding: 4px 0;
  border-left: 2px solid transparent;
  padding-left: 12px;
  transition: color 0.2s, border-color 0.2s;
}

.article-toc-list a:hover,
.article-toc-list a.active {
  color: var(--primary);
  border-left-color: var(--primary);
}

.article-sidebar-cta {
  background: linear-gradient(135deg, rgba(59,130,246,0.12) 0%, rgba(99,102,241,0.08) 100%);
  border: 1px solid rgba(59,130,246,0.2);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
}

.article-sidebar-cta h4 {
  font-size: 16px;
  margin-bottom: 8px;
}

.article-sidebar-cta p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.5;
}

/* Related Articles */
.article-related {
  padding: 0 24px 100px;
  max-width: 1100px;
  margin: 0 auto;
}

.article-related-title {
  font-size: 28px;
  letter-spacing: -0.03em;
  margin-bottom: 32px;
  padding-top: 48px;
  border-top: 1px solid var(--border-light);
}

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

  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-sidebar {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .article-toc { margin-bottom: 0; }
}

@media (max-width: 768px) {
  .blog-hero {
    padding: 140px 0 70px;
  }

  .blog-hero h1 {
    font-size: 40px;
  }

  .blog-hero p {
    font-size: 17px;
  }

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

  .blog-featured-img {
    min-height: 240px;
  }

  .blog-featured-body {
    padding: 32px 28px;
  }

  .blog-featured-body h2 {
    font-size: 24px;
  }

  .blog-grid {
    grid-template-columns: 1fr;
  }

  .blog-cta-content h2 {
    font-size: 32px;
  }

  .article-header-title {
    font-size: 34px;
  }

  .article-header-excerpt {
    font-size: 17px;
  }

  .article-sidebar {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .blog-search-kbd { display: none; }
  .blog-stats { display: none; }
}