:root {
  --bg: #f3f4f6;
  --sidebar-bg: #e8ebef;
  --panel-bg: #ffffff;
  --line: #d5dae0;
  --text: #1f2933;
  --muted: #5f6c7a;
  --accent: #0f5cc0;
  --accent-soft: #dbe8ff;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
  --sidebar-width: 260px;
  --content-max: 980px;
  --font-body: "Noto Sans KR", "Malgun Gothic", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
}

code {
  font-family: "Consolas", "Courier New", monospace;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
}

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  min-height: 100vh;
  padding: 28px 18px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--line);
  overflow-y: auto;
}

.sidebar-label {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.sidebar-head h1 {
  margin: 0;
  font-size: 1.9rem;
}

.sidebar-text {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.page-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 16px;
}

.nav-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-link {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  text-align: left;
  font: inherit;
  cursor: pointer;
}

.page-link:hover,
.page-link:focus-visible {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.6);
  outline: none;
}

.page-link.active {
  border-color: #bad0f8;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
}

.subpage-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 12px;
  border-left: 2px solid #cdd7e2;
}

.subpage-link {
  width: 100%;
  padding: 6px 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  text-align: left;
  font: inherit;
  font-size: 0.94rem;
  cursor: pointer;
}

.subpage-link:hover,
.subpage-link:focus-visible {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.5);
  color: var(--text);
  outline: none;
}

.content-area {
  padding: 32px;
}

.top-toolbar {
  width: min(100%, var(--content-max));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.toolbar-links {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.toolbar-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
}

.toolbar-links a:hover,
.toolbar-links a:focus-visible {
  color: var(--text);
  text-decoration: underline;
  outline: none;
}

.help-chip {
  padding: 10px 18px;
  border: 1px solid var(--line);
  background: var(--panel-bg);
  color: var(--text);
  font: inherit;
  font-weight: 700;
  box-shadow: var(--shadow);
}

.language-box {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: var(--panel-bg);
  box-shadow: var(--shadow);
  color: var(--muted);
}

.language-box span {
  font-size: 0.95rem;
  font-weight: 700;
}

.language-box select {
  min-width: 120px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  font: inherit;
  padding: 8px 10px;
}

.content-status,
.doc-view {
  width: min(100%, var(--content-max));
  background: var(--panel-bg);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.content-status {
  padding: 22px 24px;
  color: var(--muted);
}

.doc-view {
  padding: 30px 32px 36px;
}

.doc-header {
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.doc-meta {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 700;
}

.doc-header h2 {
  margin: 0;
  font-size: 2rem;
}

.doc-content {
  padding-top: 24px;
}

.doc-content h1,
.doc-content h2,
.doc-content h3 {
  margin: 0 0 14px;
  line-height: 1.3;
}

.doc-content h1 {
  font-size: 1.9rem;
}

.doc-content h2 {
  margin-top: 26px;
  font-size: 1.45rem;
}

.doc-content h2[id] {
  scroll-margin-top: 24px;
}

.doc-content h3 {
  margin-top: 20px;
  font-size: 1.15rem;
}

.doc-content p,
.doc-content li,
.doc-content blockquote {
  color: var(--muted);
  line-height: 1.8;
}

.doc-content p,
.doc-content ul,
.doc-content ol,
.doc-content blockquote {
  margin: 0 0 16px;
}

.doc-content ul,
.doc-content ol {
  padding-left: 22px;
}

.doc-content blockquote {
  margin-left: 0;
  padding: 12px 14px;
  border-left: 4px solid var(--accent);
  background: #f7faff;
}

.doc-content a {
  color: var(--accent);
}

.doc-content strong {
  color: var(--text);
}

.doc-content code {
  padding: 2px 6px;
  background: #eef2f7;
}

@media (max-width: 820px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    min-height: auto;
    padding: 20px 16px;
    overflow-y: visible;
  }

  .content-area {
    padding: 16px;
  }

  .top-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .toolbar-links {
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .language-box {
    justify-content: space-between;
  }

  .doc-view {
    padding: 22px 18px 26px;
  }

  .doc-header h2 {
    font-size: 1.6rem;
  }
}