/* =============================================
   Blog Page Styles
   ============================================= */

/* Blog Hero Section */
.blog-hero {
  position: relative;
  padding: 4rem 2rem 2rem;
  text-align: center;
  background: linear-gradient(180deg, var(--bg) 0%, rgba(30, 30, 45, 0.5) 100%);
}

.blog-hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.blog-hero h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.blog-subtitle {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 0.5rem;
}

/* Blog content wrapper */
.blog-content-wrapper {
  position: relative;
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 3rem;
  align-items: start;
}

/* =============================================
   Table of Contents (TOC)
   ============================================= */
.blog-toc {
  position: sticky;
  top: 100px;
  padding: 1.5rem;
  background: rgba(30, 30, 45, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  overflow: var(--overflow-clip);
}

.toc-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.toc-icon {
  width: 20px;
  height: 20px;
  stroke: var(--accent);
  flex-shrink: 0;
}

.toc-header h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin: 0;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.toc-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toc-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.toc-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--accent);
  transform: scaleY(0);
  transition: transform 0.3s ease;
}

.toc-link:hover {
  color: var(--accent);
  background: rgba(106, 176, 243, 0.1);
  padding-left: 1rem;
}

.toc-link:hover::before {
  transform: scaleY(1);
}

.toc-count {
  margin-left: auto;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.4);
  font-weight: 500;
}

/* =============================================
   Blog Grid & Category Sections
   ============================================= */
.blog-section {
  min-height: 60vh;
}

.blog-grid {
  display: block;
}

.category-section {
  margin-bottom: 4rem;
  scroll-margin-top: 120px; /* Offset for sticky TOC */
}

.category-section:last-child {
  margin-bottom: 0;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.category-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(106, 176, 243, 0.2) 0%, rgba(74, 141, 195, 0.3) 100%);
  border-radius: var(--radius-md);
  border: 1px solid rgba(106, 176, 243, 0.3);
  overflow: var(--overflow-clip);
}

.category-icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--accent);
  fill: none;
}

.category-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin: 0;
}

.category-count {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.5);
  margin-left: auto;
}

.category-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}

/* =============================================
   Blog Cards
   ============================================= */
.blog-card {
  position: relative;
  height: 420px;
  perspective: 1000px;
  cursor: pointer;
  transition: transform 0.3s ease;
}

.blog-card:hover {
  transform: translateY(-5px);
}

.blog-card-link {
  display: block;
  width: 100%;
  height: 100%;
  text-decoration: none;
  color: inherit;
}

.blog-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}

.blog-card:hover .blog-card-inner {
  transform: rotateY(180deg);
}

/* Front and Back common styles */
.blog-card-front,
.blog-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-lg);
  overflow: var(--overflow-clip);
  background: rgba(30, 30, 45, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: border-color 0.3s ease;
}

.blog-card:hover .blog-card-front,
.blog-card:hover .blog-card-back {
  border-color: rgba(106, 176, 243, 0.4);
}

/* Front Side */
.blog-card-front {
  display: flex;
  flex-direction: column;
}

.card-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, rgba(106, 176, 243, 0.2) 0%, rgba(74, 141, 195, 0.3) 100%);
  background-size: cover;
  background-position: center;
  position: relative;
  overflow: hidden;
}

.card-image-placeholder {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  opacity: 0.3;
}

.card-image-placeholder svg {
  width: 100%;
  height: 100%;
  stroke: var(--accent);
}

.card-front-content {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card-front-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.card-excerpt {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  flex: 1;
}

.card-category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
}

.category-tag {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  background: rgba(106, 176, 243, 0.15);
  border: 1px solid rgba(106, 176, 243, 0.3);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Back Side */
.blog-card-back {
  transform: rotateY(180deg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: linear-gradient(135deg, rgba(30, 30, 45, 0.95) 0%, rgba(20, 20, 35, 0.95) 100%);
}

.blog-card-back h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
}

.card-back-full-excerpt {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.6;
  flex: 1;
  overflow-y: auto;
  margin-bottom: 1.5rem;
}

.card-back-meta {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
}

.meta-item svg {
  width: 16px;
  height: 16px;
  stroke: var(--accent);
  flex-shrink: 0;
}

.meta-date {
  font-weight: 500;
}

.card-back-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: var(--accent);
  color: var(--bg);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all 0.3s ease;
  margin-top: 1rem;
}

.card-back-cta:hover {
  background: rgba(106, 176, 243, 0.9);
  transform: translateX(3px);
}

.card-back-cta svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  transition: transform 0.3s ease;
}

.card-back-cta:hover svg {
  transform: translateX(3px);
}

/* =============================================
   Responsive Design
   ============================================= */

@media (max-width: 1024px) {
  .blog-content-wrapper {
    grid-template-columns: 220px 1fr;
    gap: 2rem;
  }

  .blog-toc {
    top: 80px;
    padding: 1.25rem;
  }

  .category-cards {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .blog-hero h1 {
    font-size: 2.5rem;
  }

  .blog-subtitle {
    font-size: 1rem;
  }

  .blog-content-wrapper {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 1.5rem;
  }

  .blog-toc {
    position: relative;
    top: 0;
    border-radius: var(--radius-md);
  }

  .category-section {
    scroll-margin-top: 80px;
  }

  .category-header {
    flex-wrap: wrap;
  }

  .category-title {
    font-size: 1.3rem;
  }

  .category-cards {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .blog-card {
    height: 400px;
  }
}

@media (max-width: 480px) {
  .blog-hero {
    padding: 3rem 1.5rem 1.5rem;
  }

  .blog-hero h1 {
    font-size: 2rem;
  }

  .blog-subtitle {
    font-size: 0.9rem;
  }

  .blog-content-wrapper {
    padding: 1rem;
  }

  .blog-toc {
    padding: 1rem;
  }

  .toc-header h2 {
    font-size: 0.9rem;
  }

  .toc-link {
    font-size: 0.85rem;
    padding: 0.4rem 0.6rem;
  }

  .category-icon {
    width: 35px;
    height: 35px;
  }

  .category-icon svg {
    width: 18px;
    height: 18px;
  }

  .category-title {
    font-size: 1.2rem;
  }

  .blog-card {
    height: 380px;
  }

  .card-front-content {
    padding: 1.25rem;
  }

  .card-front-content h3 {
    font-size: 1.1rem;
  }

  .card-excerpt {
    font-size: 0.85rem;
  }

  .blog-card-back {
    padding: 1.5rem;
  }

  .blog-card-back h3 {
    font-size: 1.1rem;
  }

  .card-back-full-excerpt {
    font-size: 0.85rem;
  }
}

/* =============================================
   Animation & Transitions
   ============================================= */

/* Stagger animation for cards */
.blog-card {
  animation: fadeInUp 0.6s ease-out backwards;
  animation-delay: calc(var(--card-index, 0) * 0.05s);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Smooth scrolling for TOC navigation */
html {
  scroll-behavior: smooth;
}

/* Active TOC link style (can be enhanced with JS) */
.toc-link.active {
  color: var(--accent);
  background: rgba(106, 176, 243, 0.15);
  padding-left: 1rem;
}

.toc-link.active::before {
  transform: scaleY(1);
}