:root {
  --bg: #fafafa;
  --sidebar-bg: #0f0f0f;
  --sidebar-w: 248px;
  --accent: #6366f1;
  --text: #111;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --radius: 10px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Noto Sans KR', 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--sidebar-bg);
  padding: 24px 12px;
  position: fixed;
  top: 0; left: 0;
  overflow-y: auto;
  overflow-x: hidden;
  border-right: 1px solid #1f1f1f;
  transition: width .25s ease, padding .25s ease;
}

/* ── Sidebar Close Button (inside brand) ── */
.sidebar-close-btn {
  position: absolute;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  width: 28px; height: 28px;
  background: transparent;
  border: none;
  border-radius: 6px;
  color: #c9cdd4;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 1;
  transition: background .12s, color .12s;
}
.sidebar-close-btn:hover { background: #1f1f1f; color: #9ca3af; }

/* ── Sidebar Open Button (fixed, shown when collapsed) ── */
.sidebar-open-btn {
  position: fixed;
  top: 16px;
  left: 16px;
  width: 32px; height: 32px;
  background: #1a1a1a;
  border: 1px solid #2e2e2e;
  border-radius: 8px;
  color: #6b7280;
  cursor: pointer;
  z-index: 200;
  display: none;
  align-items: center; justify-content: center;
  transition: background .12s, color .12s, box-shadow .12s;
}
.sidebar-open-btn:hover { background: #242424; color: #e5e7eb; box-shadow: 0 2px 8px rgba(0,0,0,.4); }

/* ── Collapsed State ── */
body.sidebar-collapsed .sidebar {
  width: 0;
  padding-left: 0;
  padding-right: 0;
}
body.sidebar-collapsed .main { margin-left: 0; }
body.sidebar-collapsed .sidebar-open-btn { display: flex; }
.sidebar-brand {
  position: relative;
  padding: 4px 10px 20px;
  border-bottom: 1px solid #222;
  margin-bottom: 12px;
}
.sidebar-brand .name {
  font-size: 13px;
  font-weight: 700;
  color: #f9fafb;
  letter-spacing: -.2px;
}
.sidebar-brand .sub {
  font-size: 11px;
  color: #6b7280;
  margin-top: 3px;
}
.nav-group {
  font-size: 13px;
  font-weight: 700;
  color: #9ca3af;
  letter-spacing: .5px;
  text-transform: uppercase;
  padding: 20px 10px 6px;
  margin: 8px -12px 0;
  padding-left: 22px;
  padding-right: 22px;
  border-top: 1px solid #4b5563;
}
.nav-group:first-of-type {
  margin-top: 0;
  border-top: none;
  padding-top: 8px;
}
.nav-subcategory {
  font-size: 12px;
  font-weight: 600;
  color: #9ca3af;
  padding: 10px 10px 4px;
  letter-spacing: .3px;
  opacity: 0.8;
}
.nav-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: #9ca3af;
  padding: 8px 10px;
  border-radius: 7px;
  font-size: 13px;
  cursor: pointer;
  transition: background .12s, color .12s;
  text-decoration: none;
  margin-bottom: 2px;
}
.nav-item .dot { margin-top: 5px; flex-shrink: 0; }

/* Lucide 는 <i data-lucide> 를 <svg> 로 교체하므로, 바깥 <span class="nav-icon-wrap"> 를
   안정적인 wrapper 로 사용. wrapper 에 title 의 line-box (16px × 1.4 = 22.4px)
   동일한 height 를 주면 align-items: flex-start 에서 top-edge 가 정확히 일치.
   그 안에서 svg 를 flex-center 하되, Noto Sans KR 글리프 시각중심이 line-box
   중심에서 ~1.5px 아래에 있으므로 svg 에 translateY(1.5px) 로 보정. */
.nav-item .nav-icon-wrap {
  width: 16px;
  height: 1.4em;
  font-size: 16px;          /* .nav-item 의 13px 상속 차단 — title 과 같은 font-size */
  line-height: 1.4;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.nav-item .nav-icon {
  width: 16px;
  height: 16px;
  display: block;
  color: #6b7280;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transform: translateY(1.5px);
}
.nav-item:hover .nav-icon { color: #a5b4fc; }
.nav-item.active .nav-icon { color: var(--accent); }

/* child: title font-size 16px 유지 → wrapper line-box 도 22.4px 동일. 아이콘만 14px. */
.nav-item-child .nav-icon-wrap {
  width: 14px;
}
.nav-item-child .nav-icon {
  width: 14px;
  height: 14px;
  color: #4b5563;
}
.nav-item-child.active .nav-icon { color: var(--accent); }
.nav-item-inner {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.nav-item-title {
  color: #c9cdd4;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.4;
}
.nav-item-desc {
  font-size: 13px;
  color: #9ca3af;
  line-height: 1.4;
  margin-top: 1px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav-item:hover .nav-item-title { color: #e5e7eb; }
.nav-item:hover .nav-item-desc  { color: #566272; }
.nav-item.active .nav-item-title { color: #a5b4fc; }
.nav-item.active .nav-item-desc  { color: #6366f1; }
.nav-item:hover { background: #1a1a1a; color: #e5e7eb; }
.nav-item.active {
  background: #1e1b4b;
  color: #a5b4fc;
  font-weight: 500;
}
.nav-item .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #374151;
  flex-shrink: 0;
}
.nav-item.active .dot { background: var(--accent); }
.nav-item-child {
  padding-left: 24px;
  font-size: 12px;
  color: #6b7280;
}
.nav-item-child .dot { width: 4px; height: 4px; background: #2d2d2d; }
.nav-item-child.active { background: #1e1b4b; color: #a5b4fc; }
.nav-item-child.active .dot { background: var(--accent); }

/* ── Main ── */
.main { margin-left: var(--sidebar-w); flex: 1; min-width: 0; transition: margin-left .25s ease; }

/* ── Post Header ── */
.post-header {
  padding: 56px 48px 44px;
  border-bottom: 1px solid var(--border);
  background: white;
  position: relative;
  overflow: hidden;
}

/* ── Content Area (gray background under header) ── */
.content-area {
  background: #edf0f3;
  padding: 32px;
  min-height: calc(100vh - 200px);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ── Doc Footer (관련 문서 / 책 목차) ── */
.doc-footer {
  background: white;
  border-radius: 14px;
  border: 1px solid #dde3f0;
  padding: 28px 48px 32px;
  font-size: 14px;
  line-height: 1.75;
}
.doc-footer h2 {
  font-size: 13px;
  font-weight: 700;
  color: #6366f1;
  letter-spacing: .4px;
  text-transform: uppercase;
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid #eef2ff;
}
.doc-footer h2::before { display: none; }
.doc-footer h2 + h2 { margin-top: 24px; }
.doc-footer hr { display: none; }
.doc-footer p { margin: 0 0 8px; color: #4b5563; }
.doc-footer ul { margin: 0 0 8px 18px; color: #4b5563; }
.doc-footer li { margin-bottom: 4px; }
.doc-footer a { color: #6366f1; text-decoration: none; }
.doc-footer a:hover { text-decoration: underline; }
.doc-footer strong { color: #374151; font-weight: 600; }
.doc-footer table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin: 8px 0 12px;
}
.doc-footer th {
  background: #f9fafb;
  padding: 8px 14px;
  text-align: left;
  font-weight: 600;
  color: #374151;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
}
.doc-footer td {
  padding: 8px 14px;
  border-bottom: 1px solid #f3f4f6;
  color: #4b5563;
  vertical-align: top;
}
.doc-footer tr:last-child td { border-bottom: none; }

/* ── Site Footer ── */
.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 4px 4px;
  font-size: 12px;
  color: #9ca3af;
}
.site-footer-name { font-weight: 600; color: #6b7280; }
.site-footer-right { color: #9ca3af; }
.post-header::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, #6366f1, #8b5cf6, #d946ef);
}
.post-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  color: #6366f1;
  background: #eef2ff;
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 14px;
  letter-spacing: .3px;
}
.post-header h1 {
  font-size: 34px;
  font-weight: 700;
  color: #0f0f0f;
  line-height: 1.25;
  letter-spacing: -.5px;
  margin-bottom: 12px;
}
.post-header .desc {
  font-size: 15px;
  color: #6b7280;
  line-height: 1.7;
  max-width: 580px;
}

/* ── Post Body ── */
.post-body {
  background: white;
  border-radius: 14px;
  border: 1px solid #e2e6ea;
  box-shadow: 0 2px 12px rgba(0,0,0,.07);
  padding: 40px 48px 60px;
  margin: 0;
  line-height: 1.8;
  font-size: 15px;
}

/* Typography */
.post-body h1 { display: none; }
.post-body h2 {
  font-size: 20px;
  font-weight: 700;
  color: #0f0f0f;
  margin: 52px 0 14px;
  letter-spacing: -.3px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.post-body h2::before {
  content: '';
  display: inline-block;
  width: 4px; height: 20px;
  background: linear-gradient(180deg, #6366f1, #8b5cf6);
  border-radius: 2px;
  flex-shrink: 0;
}
.post-body h2:first-of-type { margin-top: 0; }
.post-body h3 {
  font-size: 16px;
  font-weight: 600;
  color: #1f2937;
  margin: 32px 0 10px;
  letter-spacing: -.2px;
}
.post-body h4 {
  font-size: 14px;
  font-weight: 600;
  color: #374151;
  margin: 22px 0 8px;
}
.post-body p { margin: 0 0 14px; color: #374151; }
.post-body ul, .post-body ol { margin: 0 0 14px 22px; color: #374151; }
.post-body li { margin-bottom: 5px; }
.post-body strong { color: #111; font-weight: 600; }

/* Inline code */
.post-body :not(pre) > code {
  font-family: 'Nanum Gothic Coding', 'JetBrains Mono', monospace;
  font-size: 12.5px;
  background: #f3f4f6;
  color: #6366f1;
  padding: 2px 6px;
  border-radius: 5px;
  border: 1px solid #e5e7eb;
}

/* 파일/링크 배지 — 바이올렛 틴트로 값 배지와 구분 */
.post-body a > code {
  background: #ede9fe;
  color: #5b21b6;
  border-color: #c4b5fd;
}
.post-body a:hover > code {
  background: #ddd6fe;
  border-color: #a78bfa;
}

/* Code block */
.post-body pre {
  margin: 20px 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid #1f1f1f;
}
.post-body pre code {
  font-family: 'Nanum Gothic Coding', 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.65;
  background: none !important;
  padding: 20px 24px !important;
  display: block;
}
.code-lang {
  position: absolute;
  top: 10px; right: 14px;
  font-size: 10px;
  color: #6b7280;
  font-family: 'JetBrains Mono', monospace;
  text-transform: uppercase;
  letter-spacing: .5px;
}

/* Table */
.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.post-body th {
  background: #f9fafb;
  padding: 10px 16px;
  text-align: left;
  font-weight: 600;
  color: #374151;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.post-body td {
  padding: 10px 16px;
  border-bottom: 1px solid #f3f4f6;
  color: #4b5563;
  vertical-align: top;
}
.post-body tr:last-child td { border-bottom: none; }
.post-body tr:hover td { background: #fafafa; }

/* Blockquote */
.post-body blockquote {
  border-left: 3px solid #6366f1;
  background: #fafafa;
  border-radius: 0 8px 8px 0;
  padding: 14px 18px;
  margin: 20px 0;
  color: #4b5563;
  font-size: 14px;
}

/* HR */
.post-body hr { border: none; border-top: 1px solid var(--border); margin: 40px 0; }
.post-body a { color: #6366f1; text-decoration: none; }
.post-body a:hover { text-decoration: underline; }

/* ── Mermaid ── */
.mermaid {
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 32px 24px;
  margin: 24px 0;
  text-align: left;
  overflow-x: auto;
}
.mermaid svg {
  max-width: 100%;
  height: auto;
  font-family: 'Noto Sans KR', 'Inter', sans-serif !important;
}

/* 노드 박스 */
.mermaid .node rect,
.mermaid .node circle,
.mermaid .node ellipse,
.mermaid .node polygon {
  fill: #f8fafc !important;
  stroke: #cbd5e1 !important;
  stroke-width: 1.5px !important;
}
.mermaid .node:hover rect { fill: #f1f5f9 !important; }

/* 노드 텍스트 */
.mermaid .nodeLabel,
.mermaid .label {
  font-family: 'Noto Sans KR', 'Inter', sans-serif !important;
  font-size: 13px !important;
  font-weight: 500 !important;
  color: #1e293b !important;
  fill: #1e293b !important;
}

/* 엣지 라벨 */
.mermaid .edgeLabel .label rect {
  fill: #ffffff !important;
}
.mermaid .edgeLabel .label text {
  fill: #64748b !important;
  font-size: 12px !important;
}

/* 화살표 선 */
.mermaid .edgePath .path {
  stroke: #94a3b8 !important;
  stroke-width: 1.5px !important;
}
.mermaid .arrowheadPath {
  fill: #94a3b8 !important;
  stroke: #94a3b8 !important;
}

/* ── AWS Diagram ── */
.aws-diagram {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  padding: 28px 32px 24px;
  margin: 28px 0;
  font-family: 'Inter', 'Noto Sans KR', sans-serif;
}
.aws-diagram-title {
  font-size: 13px;
  font-weight: 600;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: .8px;
  margin-bottom: 24px;
}
.aws-canvas { display: flex; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.aws-prod-canvas { display: flex; flex-direction: column; gap: 0; }
.aws-prod-row { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.ext-row { margin-top: 0; padding-left: 24px; }

.aws-group {
  border: 2px dashed #cbd5e1;
  border-radius: 12px;
  padding: 16px 20px 20px;
  position: relative;
  background: white;
}
.aws-group.prod-host { background: white; border-color: #cbd5e1; }
.aws-group.obs-group { background: #fdf4ff; border-color: #e9d5ff; border-style: solid; }
.aws-group-label {
  position: absolute;
  top: -11px; left: 14px;
  background: white;
  padding: 0 8px;
  font-size: 11px;
  font-weight: 700;
  color: #475569;
  letter-spacing: .3px;
  border-radius: 4px;
}
.aws-group.obs-group .aws-group-label { background: #fdf4ff; }

.aws-row { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.aws-prod-inner-row { display: flex; align-items: center; gap: 4px; margin-top: 8px; }

.aws-node {
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  min-width: 100px;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
  transition: box-shadow .15s, transform .15s;
}
.aws-node:hover { box-shadow: 0 4px 12px rgba(0,0,0,.1); transform: translateY(-1px); }
.aws-node.optional { opacity: .7; border-style: dashed; }
.aws-node.mini { min-width: 80px; padding: 8px 10px; }

.aws-icon {
  width: 40px; height: 40px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.aws-icon.sm { width: 28px; height: 28px; border-radius: 6px; }
.aws-icon img { display: block; }

.aws-name { font-size: 12px; font-weight: 600; color: #1e293b; text-align: center; line-height: 1.3; }
.aws-name.sm { font-size: 10px; }
.aws-sub { font-size: 10px; color: #94a3b8; text-align: center; }

.aws-node.compute  { border-top: 3px solid #FF9900; }
.aws-node.database { border-top: 3px solid #336791; }
.aws-node.storage  { border-top: 3px solid #7AA116; }
.aws-node.network  { border-top: 3px solid #6366f1; }
.aws-node.obs      { border-top: 3px solid #a855f7; }

.aws-harrow { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 0 4px; }
.aws-harrow span { font-size: 10px; color: #94a3b8; font-weight: 500; white-space: nowrap; }
.aws-harrow.small { padding: 0 2px; }
.aws-varrow { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.aws-varrow span { font-size: 10px; color: #94a3b8; font-weight: 500; }
.aws-ext-connectors { display: flex; gap: 48px; padding-left: 32px; }
.aws-ext-item { display: flex; flex-direction: column; align-items: center; }

/* ── Local Dev layout ── */
.ldev-stage {
  position: relative;
  height: 420px;
  width: 680px;
  overflow: visible;
}
.ldev-svg {
  position: absolute;
  top: 0; left: 0;
  width: 680px;
  height: 420px;
  pointer-events: none;
}
.ldev-node-pos { position: absolute; }

/* ── Legend ── */
.aws-legend {
  display: flex; gap: 12px; margin-top: 20px; padding-top: 16px;
  border-top: 1px solid #e2e8f0; flex-wrap: wrap;
}
.legend-item {
  font-size: 11px; font-weight: 500; color: #64748b;
  padding: 3px 10px; border-radius: 20px; border: 1px solid;
}
.legend-item.compute  { border-color: #FF9900; color: #c67600; background: #fff7ed; }
.legend-item.database { border-color: #336791; color: #336791; background: #eff6ff; }
.legend-item.storage  { border-color: #7AA116; color: #5a7a11; background: #f0fdf4; }
.legend-item.network  { border-color: #6366f1; color: #6366f1; background: #eef2ff; }
.legend-item.obs      { border-color: #a855f7; color: #a855f7; background: #fdf4ff; }

/* ── Mobile ── */
#sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 250;
}

@media (max-width: 768px) {
  html, body { overflow-x: hidden; }

  .sidebar {
    transform: translateX(-100%);
    width: var(--sidebar-w) !important;
    padding: 24px 12px !important;
    transition: transform .25s ease;
    z-index: 300;
  }
  body.sidebar-open .sidebar { transform: translateX(0); }
  body.sidebar-open #sidebar-backdrop { display: block; }

  .main { margin-left: 0 !important; max-width: 100vw; overflow-x: hidden; }

  .sidebar-open-btn { display: flex !important; }
  body.sidebar-open .sidebar-open-btn { display: none !important; }

  .post-header { padding: 36px 20px 24px; }
  .post-header h1 { font-size: 22px; letter-spacing: -.2px; }
  .post-header .desc { font-size: 13px; }

  .content-area { padding: 12px; }

  .post-body {
    padding: 20px 16px 36px;
    font-size: 14px;
  }

  .doc-footer { padding: 20px 16px 24px; }

  /* 테이블: 가로 스크롤 */
  .table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin: 20px 0;
  }
  .table-wrap table {
    border: none;
    border-radius: 0;
    margin: 0;
    min-width: 480px;
    width: auto;
  }

  /* 다이어그램: 가로 스크롤 */
  .aws-diagram, .mermaid { overflow-x: auto; }
  .ldev-stage { overflow-x: auto; width: 100%; }
}

/* ── Styled icons (emoji replacements) ── */
.si {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  vertical-align: middle;
  margin: 0 1px;
  position: relative;
}

/* ✅ Check */
.si-check {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #22c55e;
}
.si-check::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  width: 4px; height: 7px;
  border-right: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: translate(-50%, -62%) rotate(45deg);
}

/* ❌ Cross */
.si-cross {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #ef4444;
}
.si-cross::before,
.si-cross::after {
  content: '';
  display: block;
  position: absolute;
  width: 8px; height: 1.8px;
  background: #fff;
  border-radius: 1px;
  top: 50%; left: 50%;
}
.si-cross::before { transform: translate(-50%, -50%) rotate(45deg); }
.si-cross::after  { transform: translate(-50%, -50%) rotate(-45deg); }

/* ⚠️ Warn */
.si-warn {
  width: 17px; height: 15px;
  background: #fbbf24;
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
}
.si-warn::before {
  content: '!';
  position: absolute;
  bottom: 1px;
  font-size: 9px;
  font-weight: 800;
  color: #fff;
  font-family: 'Inter', sans-serif;
  line-height: 1;
}

/* 🚨 Alert */
.si-alert {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #ef4444;
  border: 2px solid #fca5a5;
}
.si-alert::before {
  content: '!';
  font-size: 10px;
  font-weight: 800;
  color: #fff;
  font-family: 'Inter', sans-serif;
}

/* 🔴🟡🟢 Status dots */
.si-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  display: inline-block;
  vertical-align: middle;
  margin: 0 3px;
  flex-shrink: 0;
}
.si-red    { background: #ef4444; box-shadow: 0 0 0 2.5px rgba(239, 68, 68, .18); }
.si-yellow { background: #f59e0b; box-shadow: 0 0 0 2.5px rgba(245, 158, 11, .18); }
.si-green  { background: #22c55e; box-shadow: 0 0 0 2.5px rgba(34, 197, 94, .18); }