/* ==========================================================================
   META TOUR Blog - Isolated Post Article Style Sheet
   Designed for readability, a white article theme, and namespace isolation
   (.post-article-content) to prevent CSS leaks.
   ========================================================================== */

/* === Reset & Base === */
.post-article-content,
.post-article-content *,
.post-article-content *::before,
.post-article-content *::after {
  box-sizing: border-box;
}

.post-article-content {
  --color-bg: #ffffff;
  --color-surface: #f7f8fa;
  --color-border: #e5e7eb;
  --color-text: #171717;
  --color-text-muted: #525866;
  --color-heading: #0a0a0a;
  --color-accent: #2563eb;
  --color-accent-light: rgba(37, 99, 235, 0.08);
  --color-tag-bg: #eef2ff;
  --color-tag-text: #1e3a8a;
  --color-blockquote-bg: #f8fafc;
  --color-blockquote-border: #2563eb;
  --color-caption: #667085;
  
  --font-body: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", sans-serif;
  --font-title: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", sans-serif;
  --radius: 12px;
  --radius-sm: 6px;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-inset: inset 0 2px 4px rgba(15, 23, 42, 0.02);
}

.post-article-content {
  font-size: 17px;
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  letter-spacing: 0;
  word-break: keep-all;
  overflow-wrap: break-word;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* === Layout === */
.post-article-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* === Article Header Meta === */
.post-article-content .article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  margin-bottom: 18px;
  font-size: 0.84rem;
  color: var(--color-text-muted);
}

.post-article-content .tag {
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  border-radius: var(--radius-sm);
  padding: 0.25em 0.7em;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0;
  transition: background-color 0.2s, color 0.2s;
}

.post-article-content .tag:hover {
  background: var(--color-accent);
  color: #ffffff;
}

.post-article-content .article-meta .sep {
  color: var(--color-border);
  font-size: 0.75rem;
}

/* === Headings === */
.post-article-content h1,
.post-article-content h2,
.post-article-content h3 {
  font-family: var(--font-title);
  color: var(--color-heading);
  letter-spacing: 0;
}

.post-article-content h1 {
  font-size: clamp(1.7rem, 3.4vw, 2.35rem);
  font-weight: 800;
  line-height: 1.28;
  margin: 0 0 22px;
  word-break: keep-all;
}

.post-article-content h2 {
  font-size: clamp(1.28rem, 2.3vw, 1.55rem);
  font-weight: 800;
  line-height: 1.35;
  margin: 56px 0 18px;
  padding: 0 0 0 14px;
  border-top: none;
  border-left: 4px solid var(--color-accent);
  word-break: keep-all;
}

.post-article-content h3 {
  font-size: 1.08rem;
  font-weight: 800;
  line-height: 1.45;
  margin: 32px 0 10px;
  word-break: keep-all;
}

/* === Body Typography & Links === */
.post-article-content p {
  margin: 0 0 18px;
}

.post-article-content ul,
.post-article-content ol {
  margin: 0 0 22px 1.3rem;
  padding: 0;
}

.post-article-content li {
  margin-bottom: 8px;
  line-height: 1.68;
}

.post-article-content strong {
  font-weight: 700;
  color: var(--color-heading);
}

.post-article-content a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1.5px solid var(--color-accent-light);
  transition: all 0.2s ease;
}

.post-article-content a:hover {
  background-color: var(--color-accent-light);
  border-bottom-color: var(--color-accent);
}

/* === Hero Image Wrapper === */
.post-article-content .hero-image-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 440px;
  margin: 24px 0 36px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.post-article-content .hero-image-wrapper .hero-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  margin: 0;
  border-radius: 0;
  z-index: 1;
}

/* === Key Takeaways Box (Simple Box - No Hover Motion) === */
.post-article-content .key-takeaways {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: 8px;
  padding: 22px 24px;
  margin: 34px 0;
  box-shadow: var(--shadow-sm);
}

.post-article-content .key-takeaways p.label {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 0.96rem;
  color: var(--color-heading);
  margin: 0 0 12px;
}

.post-article-content .key-takeaways ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-article-content .key-takeaways ul li {
  position: relative;
  padding-left: 1.15rem;
  font-size: 0.95rem;
  line-height: 1.62;
  margin-bottom: 8px;
  color: var(--color-text);
}

.post-article-content .key-takeaways ul li:last-child {
  margin-bottom: 0;
}

.post-article-content .key-takeaways ul li strong {
  color: var(--color-heading);
}

.post-article-content .key-takeaways ul li::before {
  content: "•";
  position: absolute;
  left: 0.25rem;
  top: 0;
  color: var(--color-accent);
  font-weight: 700;
  font-size: 1.1rem;
}

/* === Images & Captions (In-Body Inline Images) === */
.post-article-content .article-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  display: block;
  margin: 34px 0 8px;
  box-shadow: var(--shadow-md);
}

.post-article-content .image-caption {
  font-size: 0.82rem;
  color: var(--color-caption);
  text-align: center;
  margin: 0 0 34px;
  letter-spacing: 0;
  line-height: 1.55;
}

/* === Citation Capsule === */
.post-article-content .citation-capsule {
  background: var(--color-surface);
  border-left: 3px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 26px 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.62;
  position: relative;
  box-shadow: var(--shadow-inset);
}

.post-article-content .citation-capsule p {
  margin-bottom: 0;
  padding-left: 0;
}

/* === SVG Charts (Wrapper & Responsive Scroll) === */
.post-article-content .chart-wrapper {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 2.5rem 0;
  box-shadow: var(--shadow-sm);
  overflow-x: auto;
  scrollbar-width: thin;
}

.post-article-content .chart-title {
  font-family: var(--font-title);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 1rem;
  text-align: center;
}

.post-article-content .chart-source {
  font-size: 0.75rem;
  color: var(--color-caption);
  text-align: right;
  margin-top: 0.75rem;
}

.post-article-content .chart-wrapper svg {
  display: block;
  width: 100%;
  min-width: 450px;
  height: auto;
}

/* === YouTube Embed === */
.post-article-content .video-container {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  margin: 2.5rem 0 0.8rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

.post-article-content .video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.post-article-content .video-caption {
  font-size: 0.82rem;
  color: var(--color-caption);
  text-align: center;
  margin-bottom: 2.5rem;
}

/* === FAQ Section === */
.post-article-content .faq-section {
  margin-top: 3.5rem;
}

.post-article-content .faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 0;
}

.post-article-content .faq-item:last-of-type {
  border-bottom: none;
}

.post-article-content .faq-question {
  font-family: var(--font-title);
  font-weight: 700;
  color: var(--color-heading);
  font-size: 1.05rem;
  margin-bottom: 0.6rem;
}

.post-article-content .faq-answer {
  color: var(--color-text);
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* === Sources Section === */
.post-article-content .sources-section {
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

.post-article-content .sources-section h2 {
  border-top: none;
  margin-top: 0;
  font-size: 1.2rem;
}

.post-article-content .sources-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-article-content .sources-list li {
  font-size: 0.86rem;
  color: var(--color-text-muted);
  overflow-wrap: anywhere;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  line-height: 1.55;
}

.post-article-content .sources-list li:last-child {
  border-bottom: none;
}

/* === Conclusion CTA === */
.post-article-content .conclusion-cta {
  background: var(--color-accent-light);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  margin-top: 2.5rem;
  font-size: 0.98rem;
  border: 1px solid rgba(95, 90, 246, 0.1);
  box-shadow: var(--shadow-sm);
}

/* === Table of Contents (TOC - Simple Modern Box - No Hover Motion) === */
.post-article-content .toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 22px 24px;
  margin: 34px 0;
  box-shadow: var(--shadow-sm);
}

.post-article-content .toc-title {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 0.96rem;
  color: var(--color-heading);
  margin: 0 0 12px;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
}

.post-article-content .toc ol {
  counter-reset: toc-counter;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0;
  margin: 0;
}

.post-article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.92rem;
  overflow-wrap: anywhere;
}

.post-article-content .table-scroll {
  width: 100%;
  overflow-x: auto;
  margin: 28px 0;
}

.post-article-content .table-scroll table {
  margin: 0;
  min-width: 620px;
}

.post-article-content th,
.post-article-content td {
  padding: 12px 13px;
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.post-article-content th {
  background: var(--color-surface);
  color: var(--color-heading);
  font-weight: 700;
}

.post-article-content .toc li {
  counter-increment: toc-counter;
  position: relative;
  padding-left: 1.45rem;
  font-size: 0.94rem;
  line-height: 1.55;
}

.post-article-content .toc li::before {
  content: counter(toc-counter) ".";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 600;
}

.post-article-content .toc a {
  color: var(--color-text);
  text-decoration: none;
  border-bottom: none;
  transition: color 0.15s ease;
}

.post-article-content .toc a:active {
  color: var(--color-accent);
}

/* === Author Bio === */
.post-article-content .author-bio {
  background: var(--color-surface);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin: 36px 0 18px;
  font-size: 0.95rem;
  box-shadow: var(--shadow-sm);
}
.post-article-content .author-bio-title {
  font-family: var(--font-title);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0;
  color: var(--color-text-muted);
  margin-bottom: 0.6rem;
}

/* === Reading Time === */
.post-article-content .reading-time { font-size: 0.85rem; color: var(--color-text-muted); }

/* === Responsive (Mobile & Tablet) === */
@media (max-width: 680px) {
  .post-article-content { 
    font-size: 16px; 
    line-height: 1.75;
    padding: 2rem 1.15rem 4rem; 
  }
  .post-article-content h1 { font-size: 1.75rem; }
  .post-article-content h2 { font-size: 1.3rem; margin: 2.75rem 0 1rem; }
  .post-article-content .key-takeaways {
    padding: 1.25rem 1.25rem;
  }
  .post-article-content .key-takeaways p.label {
    font-size: 0.8rem;
  }
  .post-article-content .key-takeaways ul li {
    padding-left: 1.15rem;
    font-size: 0.9rem;
  }
  .post-article-content .article-image {
    margin: 2rem 0 0.5rem;
  }
  .post-article-content .image-caption {
    margin-bottom: 2rem;
  }
  .post-article-content .chart-wrapper { padding: 1rem; }
}