:root {
  color-scheme: dark;
  --bg: #0b1220;
  --surface: #111a2b;
  --surface-elevated: #151d2b;
  --border: #2a3a52;
  --border-subtle: #1f2d42;
  --text: #f1f5f9;
  --text-secondary: #cbd5e1;
  --muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-soft: rgba(59, 130, 246, 0.14);
  --danger: #f87171;
  --success: #4ade80;
  --code-bg: #0a101a;
  --sidebar-width: 300px;
  --content-max: 48rem;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.22);
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --transition: 180ms ease;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-hover);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:hover {
  color: #93c5fd;
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  border-right: 1px solid var(--border-subtle);
  background: linear-gradient(180deg, #10192a 0%, #0d1524 100%);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.sidebar-top h1 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.sidebar-subtitle {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.search-field input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.75rem;
  min-height: 44px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-field input::placeholder {
  color: var(--muted);
}

.search-field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.doc-nav {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding-right: 0.15rem;
}

.doc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.doc-tree,
.tree-children {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tree-children {
  padding-left: 0.65rem;
  margin-top: 0.15rem;
  border-left: 1px solid var(--border-subtle);
}

.tree-folder-item + .tree-folder-item,
.tree-file-item + .tree-file-item,
.tree-folder-item + .tree-file-item,
.tree-file-item + .tree-folder-item {
  margin-top: 0.15rem;
}

.tree-folder {
  border-radius: var(--radius-sm);
}

.tree-folder-label {
  cursor: pointer;
  list-style: none;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0.35rem 0.45rem;
  border-radius: var(--radius-sm);
  user-select: none;
}

.tree-folder-label::-webkit-details-marker {
  display: none;
}

.tree-folder-label::before {
  content: "▸";
  display: inline-block;
  margin-right: 0.35rem;
  transition: transform var(--transition);
}

.tree-folder[open] > .tree-folder-label::before {
  transform: rotate(90deg);
}

.tree-folder-label:hover {
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.03);
}

.tree-file {
  width: 100%;
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 0.5rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.35;
  transition:
    background var(--transition),
    border-color var(--transition),
    color var(--transition);
}

.tree-file:hover {
  background: var(--accent-soft);
  color: var(--text);
}

.tree-file.active {
  background: var(--accent-soft);
  border-color: rgba(59, 130, 246, 0.45);
  color: #dbeafe;
  font-weight: 500;
}

.doc-group + .doc-group {
  margin-top: 0.85rem;
}

.doc-group-title {
  margin: 0 0 0.35rem;
  padding: 0 0.5rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.doc-group-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.doc-group-list li + li {
  margin-top: 0.2rem;
}

.doc-group-list button {
  width: 100%;
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 0.55rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  line-height: 1.35;
  transition:
    background var(--transition),
    border-color var(--transition),
    color var(--transition);
}

.doc-group-list button:hover {
  background: var(--accent-soft);
  color: var(--text);
}

.doc-group-list button.active {
  background: var(--accent-soft);
  border-color: rgba(59, 130, 246, 0.45);
  color: #dbeafe;
  font-weight: 500;
}

.ghost-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 0.55rem 0.8rem;
  border-radius: var(--radius-sm);
  min-height: 44px;
  transition:
    color var(--transition),
    border-color var(--transition),
    background var(--transition);
}

.ghost-btn:hover {
  color: var(--text);
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.03);
}

.content {
  padding: 2rem clamp(1rem, 4vw, 3rem) 3rem;
  max-width: calc(var(--content-max) + 16rem);
  overflow: auto;
  max-height: 100vh;
}

.doc-page {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 2rem;
  align-items: start;
}

.doc-toc {
  position: sticky;
  top: 1rem;
  padding: 0.9rem 0.85rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--surface);
  max-height: calc(100vh - 2rem);
  overflow: auto;
}

.doc-toc-title {
  margin: 0 0 0.65rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.doc-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.doc-toc-item + .doc-toc-item {
  margin-top: 0.3rem;
}

.doc-toc-item a {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.84rem;
  line-height: 1.35;
  padding: 0.15rem 0;
}

.doc-toc-item a:hover {
  color: var(--accent-hover);
}

.doc-toc-item.level-1 a {
  font-weight: 600;
  color: var(--text);
}

.doc-toc-item.level-2 {
  padding-left: 0.5rem;
}

.doc-toc-item.level-3 {
  padding-left: 1rem;
}

.doc-toc-item.level-4 {
  padding-left: 1.5rem;
  font-size: 0.8rem;
}

.doc-meta {
  margin: 0 0 1.75rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.06), rgba(59, 130, 246, 0.02));
}

.doc-meta-list {
  margin: 0;
  display: grid;
  gap: 0.55rem;
}

.doc-meta-list dt {
  margin: 0;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}

.doc-meta-list dd {
  margin: 0.1rem 0 0;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.5;
}

.doc-meta-list dd + dt {
  margin-top: 0.35rem;
}

.content-header {
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.doc-breadcrumb {
  margin: 0 0 0.35rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-family: var(--font-mono);
}

.content-header h2 {
  margin: 0;
  font-size: clamp(1.35rem, 2vw, 1.75rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.prose {
  max-width: var(--content-max);
}

.markdown-body {
  color: var(--text-secondary);
}

.markdown-body > :first-child {
  margin-top: 0;
}

.markdown-body > :last-child {
  margin-bottom: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  color: var(--text);
  line-height: 1.25;
  letter-spacing: -0.02em;
  scroll-margin-top: 1.5rem;
}

.markdown-body h1 {
  font-size: 1.9rem;
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.markdown-body h2 {
  font-size: 1.45rem;
  margin: 2rem 0 0.85rem;
}

.markdown-body h3 {
  font-size: 1.15rem;
  margin: 1.5rem 0 0.65rem;
}

.markdown-body h4 {
  font-size: 1rem;
  margin: 1.25rem 0 0.5rem;
}

.heading-anchor {
  color: inherit;
  text-decoration: none;
}

.heading-anchor:hover {
  color: var(--accent-hover);
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body dl,
.markdown-body blockquote,
.markdown-body pre,
.markdown-body table,
.markdown-body .mermaid-block,
.markdown-body .md-figure {
  margin: 0 0 1rem;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.35rem;
}

.markdown-body li + li {
  margin-top: 0.35rem;
}

.markdown-body li > ul,
.markdown-body li > ol {
  margin-top: 0.35rem;
}

.markdown-body strong {
  color: var(--text);
  font-weight: 600;
}

.markdown-body hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

.markdown-body a.doc-link {
  color: var(--accent-hover);
  text-decoration: underline;
  text-underline-offset: 0.18em;
  cursor: pointer;
}

.markdown-body a.doc-link:hover {
  color: #93c5fd;
}

.markdown-body a.broken-link {
  color: var(--danger);
  text-decoration: line-through;
}
  margin: 1.25rem 0;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--accent);
  background: rgba(59, 130, 246, 0.06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
}

.markdown-body blockquote p:last-child {
  margin-bottom: 0;
}

.markdown-body details {
  margin: 1.25rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-elevated);
  overflow: hidden;
}

.markdown-body details > summary {
  cursor: pointer;
  padding: 0.85rem 1rem;
  font-weight: 600;
  color: var(--text);
  list-style: none;
  background: rgba(255, 255, 255, 0.03);
}

.markdown-body details > summary::-webkit-details-marker {
  display: none;
}

.markdown-body details > summary::before {
  content: "▸";
  display: inline-block;
  margin-right: 0.45rem;
  transition: transform var(--transition);
}

.markdown-body details[open] > summary::before {
  transform: rotate(90deg);
}

.markdown-body details > :not(summary) {
  padding: 0 1rem 1rem;
}

.markdown-body .katex-display {
  margin: 1rem 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.markdown-body .katex {
  font-size: 1.05em;
}

.code-block {
  position: relative;
  margin: 1.25rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--code-bg);
  box-shadow: var(--shadow-soft);
}

.code-lang {
  display: block;
  padding: 0.45rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-subtle);
}

.code-block pre,
.markdown-body pre:not(.mermaid) {
  margin: 0;
  padding: 1rem 1.1rem;
  overflow: auto;
  background: transparent;
  border: 0;
}

.code-block pre code,
.markdown-body pre code.hljs {
  background: transparent;
  padding: 0;
  border: 0;
  font-size: 0.88rem;
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.markdown-body :not(pre) > code {
  background: rgba(148, 163, 184, 0.12);
  color: #dbeafe;
  padding: 0.15rem 0.4rem;
  border-radius: 5px;
  border: 1px solid rgba(148, 163, 184, 0.18);
}

.table-scroll {
  margin: 1.25rem 0;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-elevated);
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.markdown-body th,
.markdown-body td {
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.65rem 0.85rem;
  text-align: left;
  vertical-align: top;
}

.markdown-body th {
  color: var(--text);
  font-weight: 600;
  background: rgba(255, 255, 255, 0.03);
}

.markdown-body tr:last-child td {
  border-bottom: 0;
}

.markdown-body tbody tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.015);
}

.md-figure {
  margin: 1.25rem 0;
}

.md-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.mermaid-block {
  margin: 1.5rem 0;
  padding: 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(59, 130, 246, 0.28);
  background:
    radial-gradient(circle at top right, rgba(59, 130, 246, 0.08), transparent 45%),
    var(--surface-elevated);
  box-shadow: var(--shadow-soft);
  overflow-x: auto;
}

.mermaid-block pre.mermaid {
  margin: 0;
  padding: 0;
  background: transparent;
  border: 0;
  font-family: var(--font-mono);
  color: transparent;
  min-height: 0;
}

.mermaid-block.mermaid-rendered pre.mermaid {
  display: none;
}

.mermaid-block svg {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

.mermaid-block.mermaid-error {
  border-color: rgba(248, 113, 113, 0.45);
}

.mermaid-error-msg {
  margin: 0.5rem 0 0;
  color: var(--danger);
  font-size: 0.9rem;
}

.empty,
.error {
  color: var(--muted);
}

.error {
  color: var(--danger);
}

.comments-section {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  max-width: var(--content-max);
}

.comments-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.comments-header h3 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--text);
}

.comments-count {
  color: var(--muted);
  font-size: 0.88rem;
}

.comments-list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.comment-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.9rem 1rem;
}

.comment-meta {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.45rem;
  font-size: 0.88rem;
}

.comment-meta time {
  color: var(--muted);
  white-space: nowrap;
}

.comment-text {
  margin: 0;
  white-space: pre-wrap;
  color: var(--text-secondary);
}

.comment-form {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.comment-form label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.comment-form input,
.comment-form textarea {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.8rem;
  resize: vertical;
  min-height: 44px;
}

.comment-form-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.comment-form button[type="submit"],
.login-card button[type="submit"] {
  background: var(--accent);
  color: #eff6ff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.7rem 1.1rem;
  min-height: 44px;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition);
}

.comment-form button[type="submit"]:hover,
.login-card button[type="submit"]:hover {
  background: var(--accent-hover);
}

.comment-form button[type="submit"]:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
  background:
    radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.12), transparent 35%),
    radial-gradient(circle at 80% 0%, rgba(96, 165, 250, 0.08), transparent 30%),
    var(--bg);
}

.login-card {
  width: min(100%, 400px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.6rem;
  box-shadow: var(--shadow-soft);
}

.login-eyebrow {
  margin: 0 0 0.35rem;
  color: var(--accent-hover);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.login-card h1 {
  margin: 0 0 0.5rem;
  font-size: 1.45rem;
  letter-spacing: -0.02em;
}

.login-card p {
  margin: 0 0 1.1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.login-card form {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.password-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.password-input-wrap {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
}

.login-card input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.8rem;
  min-height: 44px;
}

.password-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: var(--radius-sm);
  padding: 0 0.8rem;
  min-height: 44px;
  white-space: nowrap;
}

.password-toggle:hover {
  color: var(--text);
  border-color: var(--accent);
}

@media (max-width: 1100px) {
  .doc-page {
    grid-template-columns: 1fr;
  }

  .doc-toc {
    position: static;
    max-height: none;
    order: -1;
  }
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    max-height: 42vh;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }

  .content {
    max-height: none;
  }
}

@media (max-width: 600px) {
  .content {
    padding: 1.25rem 1rem 2rem;
  }

  .markdown-body h1 {
    font-size: 1.55rem;
  }

  .markdown-body h2 {
    font-size: 1.25rem;
  }

  .comment-meta {
    flex-direction: column;
    gap: 0.2rem;
  }
}