/* ═══════════════════════════════════════════════════
   Pet-Pass Dev Blog — 공통 스타일
   모든 포스트(post1~)가 공유하는 레이아웃 및 컴포넌트.
   포스트 고유 스타일은 각 파일의 <style> 블록에 선언한다.
═══════════════════════════════════════════════════ */

/* ─── 기본 레이아웃 ─── */
body {
  background-color: var(--bg-secondary);
  font-family: 'Pretendard', sans-serif;
  margin: 0;
  padding: 0;
  color: var(--text-primary);
  overflow-y: auto !important;
  min-height: 100vh;
}

/* ─── 블로그 헤더 ─── */
.blog-header {
  background: var(--surface);
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.blog-header h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.blog-header .theme-dots {
  position: absolute; right: 16px; top: 50%; transform: translateY(-50%);
}

/* ─── 상단 네비게이션 버튼 ─── */
.nav-buttons {
  max-width: 800px;
  margin: 20px auto 0;
  padding: 0 20px;
  display: flex;
  gap: 10px;
}

.btn-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 30px;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
}

.btn-nav:hover {
  background: var(--bg-secondary);
  transform: translateY(-1px);
}

/* ─── 본문 컨테이너 ─── */
.blog-content {
  max-width: 800px;
  margin: 20px auto 60px;
  padding: 40px;
  background: var(--bg-primary);
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  line-height: 1.9;
}

/* ─── 포스트 메타 ─── */
.post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.post-series-tag {
  display: inline-block;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 12px;
  color: var(--text-tertiary);
  font-weight: 600;
}

.read-time {
  font-size: 12px;
  color: var(--text-tertiary);
}

.post-main-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  margin-top: 0;
  margin-bottom: 24px;
  line-height: 1.4;
}

/* ─── 태그 ─── */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 36px;
}

.tag-chip {
  display: inline-block;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 3px 10px;
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ─── 목차 ─── */
.toc {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 40px;
  border: 1px solid var(--border);
}

.toc-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 0 0 12px 0;
}

.toc ol {
  margin: 0;
  padding-left: 20px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 2.2;
}

.toc a { color: var(--text-secondary); text-decoration: none; }
.toc a:hover { color: var(--primary); }

/* ─── 본문 텍스트 ─── */
.blog-content h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 52px;
  margin-bottom: 16px;
  border-left: 4px solid var(--primary);
  padding-left: 14px;
}

.blog-content p { font-size: 16px; color: var(--text-secondary); margin-bottom: 20px; }
.blog-content strong { color: var(--text-primary); font-weight: 700; }
.blog-content code {
  background: var(--bg-secondary);
  padding: 2px 8px;
  border-radius: 5px;
  font-family: 'Courier New', monospace;
  font-size: 13px;
  color: var(--primary);
  border: 1px solid var(--border);
}

/* ─── 하이라이트 박스 ─── */
.highlight-box {
  background: var(--bg-secondary);
  border-left: 4px solid var(--primary);
  border-radius: 0 12px 12px 0;
  padding: 18px 20px;
  margin: 28px 0;
}

.highlight-box p { margin: 0; font-size: 15px; font-style: italic; color: var(--text-secondary); }

/* ─── 레슨 박스 ─── */
.lesson-box {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 24px 28px;
  margin: 40px 0;
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
}

.lesson-box h3 {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 14px 0;
}

.lesson-box p { margin: 0 0 10px 0; font-size: 15px; color: var(--text-secondary); }
.lesson-box p:last-child { margin-bottom: 0; }

/* ─── 구분선 ─── */
.divider { border: none; border-top: 1px solid var(--border); margin: 40px 0; }

/* ─── 타임라인 ─── */
.timeline {
  border-left: 2px solid var(--border);
  padding-left: 24px;
  margin: 32px 0;
}

.timeline-item {
  position: relative;
  margin-bottom: 28px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -31px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid var(--bg-primary);
}

.timeline-item.fail::before { background: #ef4444; }

.timeline-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.timeline-item.fail .timeline-label { color: #ef4444; }
.timeline-item p { margin: 0; font-size: 15px; color: var(--text-secondary); }

/* ─── 포스트 푸터 / 이전·다음 글 ─── */
.post-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.btn-post-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 30px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
}

.btn-prev { background: var(--surface); border: 1px solid var(--border); color: var(--text-primary); }
.btn-next { background: var(--primary); color: white; border: none; }
.btn-prev:hover { background: var(--bg-secondary); }
.btn-next:hover { opacity: 0.9; transform: translateX(2px); }

/* ─── 아키텍처 비교 다이어그램 ─── */
.arch-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 32px 0;
}

.arch-col {
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.arch-col-label {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 6px 0;
  text-align: center;
  border-radius: 8px 8px 0 0;
}

.arch-col-label.before { background: #fef2f2; color: #ef4444; }
.arch-col-label.after  { background: #f0fdf4; color: #16a34a; }

.arch-node {
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: none;
  padding: 10px 14px;
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

.arch-node small {
  display: block;
  font-size: 11px;
  color: var(--text-tertiary);
  font-weight: 400;
  margin-top: 2px;
}

.arch-node.arch-accent {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.arch-node.arch-accent small { color: rgba(255,255,255,0.75); }

.arch-node.arch-dim {
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.arch-arrow {
  text-align: center;
  color: var(--text-tertiary);
  font-size: 11px;
  padding: 5px 0;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

.arch-result {
  padding: 8px 14px;
  text-align: center;
  font-size: 12px;
  font-weight: 700;
  border-radius: 0 0 8px 8px;
  border: 1px solid;
  border-top: none;
}

.arch-result.bad  { background: #fef2f2; color: #ef4444; border-color: #fecaca; }
.arch-result.good { background: #f0fdf4; color: #16a34a; border-color: #bbf7d0; }

/* ─── 반응형 ─── */
@media (max-width: 600px) {
  .blog-content { padding: 24px 20px; }
  .post-main-title { font-size: 22px; }
  .post-footer { flex-direction: column; align-items: stretch; }
  .btn-post-nav { justify-content: center; }
}