/* ============================================================
   Kim Joo-in Clinic Blog — Clean Reading Experience
   ============================================================ */

:root {
  --blog-bg: #fafafa;
  --blog-surface: #ffffff;
  --blog-text: #1a1a1a;
  --blog-text-secondary: #555;
  --blog-accent: #2563eb;
  --blog-accent-light: #eff6ff;
  --blog-border: #e5e7eb;
  --blog-max-width: 720px;
  --blog-font: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

body {
  font-family: var(--blog-font);
  background: var(--blog-bg);
  color: var(--blog-text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* --- Header --- */
.blog-header {
  background: var(--blog-surface);
  border-bottom: 1px solid var(--blog-border);
  padding: 16px 24px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.blog-header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.blog-header a { text-decoration: none; color: var(--blog-text); }
.blog-brand {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.blog-brand span { color: var(--blog-accent); }
.blog-nav { display: flex; gap: 20px; font-size: 14px; }
.blog-nav a { color: var(--blog-text-secondary); transition: color 0.2s; }
.blog-nav a:hover { color: var(--blog-accent); }

/* --- Index page --- */
.blog-index {
  max-width: 960px;
  margin: 0 auto;
  padding: 48px 24px;
}
.blog-index h2 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}
.blog-index-subtitle {
  color: var(--blog-text-secondary);
  font-size: 16px;
  margin-bottom: 40px;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.post-card {
  background: var(--blog-surface);
  border: 1px solid var(--blog-border);
  border-radius: 12px;
  padding: 28px;
  transition: box-shadow 0.2s, transform 0.15s;
  text-decoration: none;
  color: inherit;
  display: block;
}
.post-card:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}
.post-card-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--blog-accent);
  background: var(--blog-accent-light);
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
}
.post-card h3 {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}
.post-card p {
  font-size: 14px;
  color: var(--blog-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}
.post-card-meta {
  font-size: 13px;
  color: #999;
}

/* --- Article page --- */
.blog-article {
  max-width: var(--blog-max-width);
  margin: 0 auto;
  padding: 48px 24px 80px;
}
.blog-article-header {
  margin-bottom: 40px;
}
.blog-article-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--blog-accent);
  background: var(--blog-accent-light);
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 16px;
}
.blog-article-header h1 {
  font-size: 34px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}
.blog-article-meta {
  color: var(--blog-text-secondary);
  font-size: 14px;
  display: flex;
  gap: 16px;
  align-items: center;
}
.blog-article-meta span { display: flex; align-items: center; gap: 4px; }

/* --- Article body --- */
.blog-body h2 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 48px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--blog-accent-light);
}
.blog-body h3 {
  font-size: 19px;
  font-weight: 600;
  margin: 32px 0 12px;
}
.blog-body p {
  font-size: 17px;
  margin-bottom: 20px;
}
.blog-body ul, .blog-body ol {
  margin: 0 0 20px 24px;
  font-size: 17px;
}
.blog-body li { margin-bottom: 8px; }
.blog-body strong { font-weight: 600; }

.blog-body blockquote {
  border-left: 3px solid var(--blog-accent);
  background: var(--blog-accent-light);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 8px 8px 0;
  font-size: 16px;
}

.info-box {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 8px;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 15px;
}
.info-box-title {
  font-weight: 700;
  margin-bottom: 4px;
}
.warning-box {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 8px;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 15px;
}

.detail-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 15px;
}
.detail-table th, .detail-table td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--blog-border);
}
.detail-table th {
  background: #f9fafb;
  font-weight: 600;
  width: 35%;
}

/* --- CTA box --- */
.cta-box {
  background: linear-gradient(135deg, #eff6ff 0%, #e0f2fe 100%);
  border: 1px solid #bfdbfe;
  border-radius: 12px;
  padding: 28px;
  margin: 40px 0;
  text-align: center;
}
.cta-box h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}
.cta-box p { font-size: 15px; color: var(--blog-text-secondary); margin-bottom: 16px; }
.cta-btn {
  display: inline-block;
  background: var(--blog-accent);
  color: #fff;
  padding: 10px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  transition: background 0.2s;
}
.cta-btn:hover { background: #1d4ed8; }

/* --- Footer --- */
.blog-footer {
  border-top: 1px solid var(--blog-border);
  padding: 32px 24px;
  text-align: center;
  font-size: 13px;
  color: #999;
}
.blog-footer a { color: var(--blog-accent); text-decoration: none; }

/* --- Responsive --- */
@media (max-width: 768px) {
  .blog-article-header h1 { font-size: 26px; }
  .blog-body h2 { font-size: 21px; }
  .blog-body p, .blog-body ul, .blog-body ol { font-size: 16px; }
  .post-grid { grid-template-columns: 1fr; }
  .blog-nav { gap: 12px; }
}