/**
 * YouTube Blog Styles v2.0 - Dualsoft
 * 의존성: common-vars.css
 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* 참고: 색상 변수는 common-vars.css에서 상속 */
/* 추가 변수만 정의 */
:root {
  --dark: #0A0E27;
  --darker: #060920;
  --light: #F8FAFC;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* Container */
.blog-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
}

/* Header */
.blog-header {
  text-align: center;
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border-color);
}

.blog-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.blog-header .subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.blog-header .stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 24px;
}

.blog-header .stat-item {
  text-align: center;
}

.blog-header .stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--secondary);
}

.blog-header .stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Back Link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 24px;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--primary);
}

/* Category Badge */
.category-badge {
  display: inline-block;
  padding: 6px 16px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.category-badge.aas-runtime { background: linear-gradient(135deg, #6366F1, #8B5CF6); }
.category-badge.ds-tutorials { background: linear-gradient(135deg, #10B981, #14B8A6); }
.category-badge.dts-basic { background: linear-gradient(135deg, #F59E0B, #EAB308); }
.category-badge.dts-duality { background: linear-gradient(135deg, #EF4444, #F97316); }
.category-badge.dts-extension { background: linear-gradient(135deg, #0066FF, #00D9FF); }
.category-badge.dts-korean { background: linear-gradient(135deg, #EC4899, #F43F5E); }
.category-badge.legacy { background: linear-gradient(135deg, #6B7280, #9CA3AF); }

/* Category Section */
.category-section {
  margin-bottom: 48px;
}

.category-section h2 {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border-color);
}

.category-section h2 .count {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-card);
  padding: 4px 12px;
  border-radius: 12px;
}

/* Video Grid */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

/* Video Card */
.video-card {
  background: var(--bg-card);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.video-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 0 12px 40px rgba(0, 102, 255, 0.15);
}

.video-card a {
  text-decoration: none;
  color: inherit;
}

.video-card .thumbnail {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.video-card .thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}

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

.video-card .duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-family: 'JetBrains Mono', monospace;
}

.video-card .card-content {
  padding: 16px;
}

.video-card h3 {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-card .meta {
  display: flex;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Video Link (Thumbnail + Play Button) */
.video-link {
  display: block;
  text-decoration: none;
  margin-bottom: 40px;
}

.video-thumbnail {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: var(--darker);
}

.video-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}

.video-link:hover .video-thumbnail img {
  transform: scale(1.02);
}

.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  background: rgba(255, 0, 0, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: white;
  transition: all 0.3s;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.video-link:hover .play-button {
  background: rgba(255, 0, 0, 1);
  transform: translate(-50%, -50%) scale(1.1);
}

.watch-youtube {
  text-align: center;
  padding: 16px;
  background: linear-gradient(135deg, #ff0000, #cc0000);
  color: white;
  font-weight: 600;
  font-size: 1.1rem;
  border-radius: 0 0 16px 16px;
  margin-top: -16px;
}

/* Blog Post (Single Video Page) */
.blog-post {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 24px;
}

.post-header {
  margin-bottom: 32px;
}

.post-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin: 16px 0 12px;
  line-height: 1.3;
}

.post-header .meta {
  display: flex;
  gap: 16px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Video Player */
.video-player {
  margin-bottom: 40px;
}

.video-player .video-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  border-radius: 16px;
  background: var(--darker);
}

.video-player iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* Thumbnail Section */
.thumbnail-section {
  margin-bottom: 40px;
}

.thumbnail-section h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.thumbnail-section h2::before {
  content: '';
  width: 4px;
  height: 24px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 2px;
}

.thumbnail-display {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.thumbnail-display img {
  width: 100%;
  height: auto;
  display: block;
}

/* Summary Section */
.summary-section {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 40px;
  border: 1px solid var(--border-color);
}

.summary-section h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.summary-section h2::before {
  content: '';
  width: 4px;
  height: 24px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 2px;
}

.summary-content {
  color: var(--text-secondary);
  line-height: 1.8;
}

.summary-content ul {
  list-style: none;
  padding: 0;
}

.summary-content li {
  padding: 8px 0;
  padding-left: 24px;
  position: relative;
}

.summary-content li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--primary);
}

/* Post Navigation */
.post-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
  margin-top: 40px;
}

.post-nav a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--bg-card);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
  transition: all 0.2s;
  border: 1px solid var(--border-color);
}

.post-nav a:hover {
  background: var(--bg-hover);
  border-color: var(--border-hover);
}

.post-nav .home {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
}

.post-nav .home:hover {
  opacity: 0.9;
}

/* Search Box */
.search-box {
  position: relative;
  margin-bottom: 32px;
}

.search-box input {
  width: 100%;
  padding: 16px 24px;
  padding-left: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.2s;
}

.search-box input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.2);
}

.search-box::before {
  content: '🔍';
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
}

/* Category Index Header */
.category-header {
  text-align: center;
  margin-bottom: 48px;
  padding: 48px 24px;
  background: linear-gradient(135deg, var(--bg-card), transparent);
  border-radius: 24px;
  border: 1px solid var(--border-color);
}

.category-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.category-header .description {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

.category-header .video-count {
  display: inline-block;
  margin-top: 16px;
  padding: 8px 20px;
  background: var(--bg-card);
  border-radius: 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .blog-header h1 {
    font-size: 1.8rem;
  }

  .blog-header .stats {
    gap: 20px;
  }

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

  .post-header h1 {
    font-size: 1.5rem;
  }

  .post-nav {
    flex-direction: column;
    gap: 12px;
  }

  .post-nav a {
    width: 100%;
    justify-content: center;
  }
}

/* Animation */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.video-card {
  animation: fadeInUp 0.4s ease forwards;
}

.video-card:nth-child(1) { animation-delay: 0.05s; }
.video-card:nth-child(2) { animation-delay: 0.1s; }
.video-card:nth-child(3) { animation-delay: 0.15s; }
.video-card:nth-child(4) { animation-delay: 0.2s; }
.video-card:nth-child(5) { animation-delay: 0.25s; }
.video-card:nth-child(6) { animation-delay: 0.3s; }

/* Blog Content Styles */
.blog-content {
  margin-bottom: 40px;
}

.content-section {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 24px;
  border: 1px solid var(--border-color);
}

.content-section h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.summary-text {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1.05rem;
}

.key-points {
  list-style: none;
  padding: 0;
}

.key-points li {
  padding: 12px 0;
  padding-left: 28px;
  position: relative;
  color: var(--text-secondary);
  line-height: 1.6;
  border-bottom: 1px solid var(--border-color);
}

.key-points li:last-child {
  border-bottom: none;
}

.key-points li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: bold;
}

.technical-box {
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(0, 217, 255, 0.05));
  border-left: 4px solid var(--primary);
  padding: 20px;
  border-radius: 0 12px 12px 0;
}

.technical-box p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin: 0;
}

.audience-text {
  color: var(--text-secondary);
  line-height: 1.8;
  padding: 12px 20px;
  background: rgba(236, 72, 153, 0.1);
  border-radius: 12px;
  border-left: 4px solid #EC4899;
}

/* Video Info Section */
.video-info {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 40px;
  border: 1px solid var(--border-color);
}

.video-info h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.info-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.info-value {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
}

.info-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.info-link:hover {
  color: var(--secondary);
}

/* Card Summary */
.card-summary {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 8px;
}

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

  .content-section {
    padding: 16px;
  }
}

/* ===== INFOGRAPHIC STYLES ===== */

/* Hero Banner */
.infographic-hero {
  background: linear-gradient(135deg, var(--bg-card), rgba(0, 102, 255, 0.1));
  border-radius: 24px;
  padding: 32px;
  margin-bottom: 32px;
  border: 1px solid var(--border-color);
  text-align: center;
}

.hero-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}

.hero-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--text-primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Flow Diagram */
.flow-section {
  margin-bottom: 32px;
}

.flow-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 24px;
  background: var(--bg-card);
  border-radius: 16px;
  border: 1px solid var(--border-color);
}

.flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 20px;
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.15), rgba(0, 217, 255, 0.1));
  border-radius: 12px;
  border: 1px solid rgba(0, 102, 255, 0.3);
  min-width: 100px;
  text-align: center;
}

.flow-step-icon {
  font-size: 1.5rem;
}

.flow-step-text {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.flow-arrow {
  font-size: 1.5rem;
  color: var(--primary);
}

/* Stats Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 20px;
  text-align: center;
  border: 1px solid var(--border-color);
  transition: all 0.3s;
}

.stat-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
}

.stat-card-icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.stat-card-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 4px;
}

.stat-card-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Feature Cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.feature-card {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 24px;
  border: 1px solid var(--border-color);
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.feature-content h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.feature-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Comparison Table */
.comparison-section {
  margin-bottom: 32px;
}

.comparison-table {
  background: var(--bg-card);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.comparison-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--border-color);
}

.comparison-row:last-child {
  border-bottom: none;
}

.comparison-row.header {
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.2), rgba(0, 217, 255, 0.1));
}

.comparison-cell {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.comparison-cell:first-child {
  border-right: 1px solid var(--border-color);
}

.comparison-icon {
  font-size: 1.2rem;
}

.comparison-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.comparison-row.header .comparison-text {
  font-weight: 600;
  color: var(--text-primary);
}

/* Timeline */
.timeline-section {
  margin-bottom: 32px;
}

.timeline-container {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 24px;
  border: 1px solid var(--border-color);
}

.timeline-item {
  display: flex;
  gap: 16px;
  padding-bottom: 20px;
  position: relative;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 20px;
  top: 44px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--primary), var(--secondary));
}

.timeline-marker {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
  z-index: 1;
}

.timeline-content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.timeline-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Benefits List */
.benefits-section {
  margin-bottom: 32px;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.benefit-item {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 20px;
  text-align: center;
  border: 1px solid var(--border-color);
}

.benefit-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.benefit-text {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* Use Cases */
.usecases-section {
  margin-bottom: 32px;
}

.usecase-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.usecase-tag {
  padding: 10px 20px;
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.15), rgba(0, 217, 255, 0.1));
  border: 1px solid rgba(0, 102, 255, 0.3);
  border-radius: 30px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Quick Info Bar */
.quick-info {
  display: flex;
  justify-content: center;
  gap: 24px;
  padding: 16px;
  background: var(--bg-card);
  border-radius: 12px;
  margin-bottom: 32px;
  border: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.quick-info-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
}

.quick-info-item .icon {
  font-size: 1.1rem;
}

.quick-info-item .label {
  color: var(--text-muted);
}

.quick-info-item .value {
  color: var(--text-primary);
  font-weight: 600;
}

/* Section Title */
.section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-title .icon {
  font-size: 1.4rem;
}

/* Call to Action */
.cta-section {
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.2), rgba(0, 217, 255, 0.1));
  border-radius: 16px;
  padding: 24px;
  text-align: center;
  margin-bottom: 32px;
  border: 1px solid rgba(0, 102, 255, 0.3);
}

.cta-text {
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--text-secondary);
}

.cta-highlight {
  color: var(--secondary);
  font-weight: 600;
}

/* Responsive for Infographics */
@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
  }

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

  .comparison-row {
    grid-template-columns: 1fr;
  }

  .comparison-cell:first-child {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .flow-container {
    flex-direction: column;
  }

  .flow-arrow {
    transform: rotate(90deg);
  }

  .quick-info {
    flex-direction: column;
    gap: 12px;
  }
}