:root {
  color-scheme: light;
  --surface: #F7FAFC;
  --surface-rgb: 247, 250, 252;
  --ink: #0b0b0b;
  --muted: #5a5a5a;
  --accent: #6366F1;
  --grid-line: rgba(0, 0, 0, 0.08);
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --step: clamp(1.6rem, 1.5vw + 1.2rem, 2.2rem);
  --highlight-bg: rgba(255, 214, 126, 0.45);
  --highlight-border: rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font-body);
  min-height: 100%;
}

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
  height: 100vh;
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  position: fixed;
  left: 1rem;
  top: 1rem;
  width: auto;
  height: auto;
  padding: 0.5rem 0.75rem;
  background: var(--ink);
  color: var(--surface);
  letter-spacing: 0.08em;
}

.shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem clamp(1.5rem, 4vw, 4rem);
  border-bottom: 1px solid var(--grid-line);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(6px);
  background: rgba(var(--surface-rgb), 0.92);
}

.top-actions {
  display: inline-flex;
  gap: 0.75rem;
}

.ghost-button {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid var(--grid-line);
  background: transparent;
  padding: 0.4rem 0.75rem;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 999px;
  transition: background 150ms ease, border-color 150ms ease, color 150ms ease;
}

.ghost-button:hover,
.ghost-button:focus-visible {
  background: rgba(0, 0, 0, 0.08);
  border-color: rgba(0, 0, 0, 0.3);
}

.ghost-label {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  font-size: clamp(1.2rem, 2vw, 1.6rem);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.brand-mark {
  font-weight: 600;
}

.brand-sub {
  font-weight: 300;
  color: var(--muted);
}


.layout {
  display: grid;
  grid-template-columns: minmax(15rem, 20rem) minmax(0, 1fr);
  min-height: 0;
  height: 100%;
  overflow: hidden;
}

.sidebar {
  border-right: 1px solid var(--grid-line);
  background: rgba(var(--surface-rgb), 0.7);
  position: relative;
  overflow: hidden;
}

.sidebar-inner {
  height: 100%;
  padding: clamp(1.5rem, 3vw, 2.25rem) clamp(1.25rem, 3vw, 2rem);
  display: grid;
  gap: 1.25rem;
  overflow-y: auto;
  scrollbar-width: thin;
}

.nav {
  display: grid;
  gap: 0.75rem;
}

.nav-title {
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav-summary {
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.5;
}

.nav-leaf,
.nav-item,
.nav-parent {
  all: unset;
  display: grid;
  gap: 0.35rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease;
  text-align: left;
}

.nav-leaf {
  padding: 0.65rem 0.9rem 0.75rem 1.1rem;
  border-left: 2px solid transparent;
}

.nav-item {
  padding: 0.6rem 0.75rem 0.6rem 1.4rem;
  border-left: 2px solid transparent;
}

.nav-parent {
  padding: 0.8rem 0.75rem 0.8rem 1.1rem;
  border-left: 2px solid transparent;
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
}

.nav-parent .nav-title {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.2em;
}

.nav-parent::after {
  content: '\25BE';
  font-size: 0.75rem;
  color: var(--muted);
  transform: rotate(-90deg);
  transition: transform 160ms ease;
}

.nav-group {
  display: grid;
  gap: 0.4rem;
}

.nav-sublist {
  display: none;
  gap: 0.35rem;
  padding-left: 0.75rem;
  border-left: 1px dashed var(--grid-line);
}

.nav-group.expanded .nav-sublist {
  display: grid;
}

/* Nested nav groups (3-level hierarchy) */
.nav-group-nested {
  margin-left: 0.5rem;
  padding-left: 0.5rem;
  border-left: 1px solid rgba(var(--ink-rgb), 0.1);
}

.nav-parent-nested {
  font-size: 0.85rem;
  padding: 0.35rem 0.5rem;
  opacity: 0.85;
}

.nav-sublist-nested {
  display: none;
  gap: 0.25rem;
  padding-left: 0.25rem;
}

.nav-group-nested.expanded .nav-sublist-nested {
  display: grid;
}

.nav-item-nested {
  font-size: 0.8rem;
  padding: 0.3rem 0.5rem;
}

.nav-item-nested .nav-summary {
  font-size: 0.7rem;
}

.nav-base:hover,
.nav-base:focus-visible {
  border-color: var(--grid-line);
  border-left-color: var(--ink);
  background: rgba(0, 0, 0, 0.03);
}

.nav-base[aria-current="page"] {
  border-color: var(--grid-line);
  border-left-color: var(--ink);
  background: rgba(0, 0, 0, 0.05);
}

/* External links in nav */
.nav-external {
  all: unset;
  display: grid;
  gap: 0.35rem;
  padding: 0.65rem 0.9rem 0.75rem 1.1rem;
  border: 1px solid transparent;
  border-left: 2px solid transparent;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease;
  text-align: left;
  text-decoration: none;
  color: inherit;
}

.nav-external:hover,
.nav-external:focus-visible {
  border-color: var(--grid-line);
  border-left-color: var(--ink);
  background: rgba(0, 0, 0, 0.03);
}

.nav-external .nav-title {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
}

.nav-external-icon {
  font-size: 0.7em;
  color: var(--muted);
  opacity: 0.7;
  transition: opacity 160ms ease;
}

.nav-external:hover .nav-external-icon {
  opacity: 1;
}

/* Press release and content type indicators */
.nav-type-press-release .nav-title {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
}

.nav-type-icon {
  font-size: 0.65em;
  color: var(--muted);
  opacity: 0;
  transition: opacity 160ms ease;
}

.nav-type-press-release .nav-type-icon::before {
  content: '\25C9'; /* Unicode circle with dot - subtle signal indicator */
}

.nav-type-press-release:hover .nav-type-icon,
.nav-type-press-release:focus-visible .nav-type-icon {
  opacity: 0.7;
}

mark.hl {
  background: var(--highlight-bg);
  border-bottom: 1px solid var(--highlight-border);
  padding: 0 0.12rem;
  border-radius: 0.15rem;
}

/* External CTA link styling */
.external-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.75rem 1.25rem;
  margin-top: 1.5rem;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 160ms ease, color 160ms ease;
}

.external-cta:hover,
.external-cta:focus {
  background: var(--ink);
  color: var(--surface);
  text-decoration: none;
}

/* External link indicator in content */
.doc-content a[target="_blank"]::after {
  content: " \2197";
  font-size: 0.75em;
  opacity: 0.6;
}

.doc-content a.external-cta[target="_blank"]::after {
  content: none;
}

.cmd {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(var(--surface-rgb), 0.65);
  backdrop-filter: blur(8px);
  padding: 1.5rem;
}

.cmd[hidden] {
  display: none;
}

.cmd-surface {
  width: min(580px, 100%);
  background: var(--surface);
  border: 1px solid var(--grid-line);
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.12);
  display: grid;
  gap: 1rem;
  padding: 1.25rem 1.25rem 1rem;
}

.cmd-header {
  display: grid;
  gap: 0.6rem;
}

.cmd-title {
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.cmd-input {
  border: 1px solid var(--grid-line);
  background: rgba(0, 0, 0, 0.02);
  padding: 0.65rem 0.85rem;
  font: inherit;
  font-size: 0.95rem;
  outline: none;
}

.cmd-input:focus {
  border-color: rgba(0, 0, 0, 0.35);
  background: rgba(0, 0, 0, 0.04);
}

.cmd-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 16rem;
  overflow-y: auto;
  border-top: 1px dashed var(--grid-line);
}

.cmd-item {
  padding: 0.75rem;
  border-bottom: 1px dashed rgba(0, 0, 0, 0.08);
  display: grid;
  gap: 0.3rem;
  cursor: pointer;
}

.cmd-item:last-child {
  border-bottom: none;
}

.cmd-item[aria-selected="true"],
.cmd-item:hover {
  background: rgba(0, 0, 0, 0.05);
}

.cmd-item-title {
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.cmd-item-summary {
  font-size: 0.75rem;
  color: var(--muted);
}

.cmd-item-group {
  font-size: 0.65rem;
  color: var(--muted);
  background: rgba(0, 0, 0, 0.08);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  margin-right: 0.5rem;
  text-transform: none;
  letter-spacing: normal;
  font-weight: 500;
}

.cmd-loading {
  color: var(--muted);
  font-style: italic;
  text-align: center;
}

.canvas {
  padding: clamp(2rem, 5vw, 5.5rem) clamp(1.5rem, 7vw, 7rem);
  display: grid;
  gap: 2.5rem;
  min-height: 0;
  height: 100%;
  overflow-y: auto;
  scrollbar-gutter: stable;
  scrollbar-width: thin;
}

/* Custom scrollbar styling - minimal black line aesthetic */
.canvas::-webkit-scrollbar {
  width: 6px;
}

.canvas::-webkit-scrollbar-track {
  background: transparent;
}

.canvas::-webkit-scrollbar-thumb {
  background: var(--ink);
  border-radius: 3px;
}

.canvas::-webkit-scrollbar-thumb:hover {
  background: var(--muted);
}

.doc-content {
  display: grid;
  gap: 1.75rem;
  line-height: 1.7;
  max-width: 78ch;
}

.doc-content h1,
.doc-content h2,
.doc-content h3,
.doc-content h4,
.doc-content h5,
.doc-content h6 {
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0;
}

.doc-content h1 { font-size: clamp(1.6rem, 1.6vw + 1.4rem, 2.2rem); }
.doc-content h2 { font-size: clamp(1.3rem, 1.3vw + 1.1rem, 1.6rem); }
.doc-content h3 { font-size: clamp(1.1rem, 1vw + 0.95rem, 1.3rem); }
.doc-content h4 { font-size: 1rem; }

.doc-content p {
  margin: 0;
  color: var(--ink);
}

.doc-content ul,
.doc-content ol {
  margin: 0;
  padding-left: 1.4rem;
  display: grid;
  gap: 0.5rem;
}

.doc-content li {
  line-height: 1.6;
}

.doc-content pre {
  background: rgba(0, 0, 0, 0.04);
  padding: 1rem 1.25rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  border: 1px solid rgba(0, 0, 0, 0.08);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
}

.doc-content code {
  font-family: var(--font-mono);
  background: rgba(0, 0, 0, 0.05);
  padding: 0.1rem 0.3rem;
  border-radius: 0.25rem;
}

.doc-content pre code {
  background: transparent;
  padding: 0;
}

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.doc-content th,
.doc-content td {
  border: 1px solid rgba(0, 0, 0, 0.12);
  padding: 0.65rem 0.75rem;
  text-align: left;
}

.doc-content th {
  background: rgba(0, 0, 0, 0.04);
  font-weight: 600;
}

.doc-content blockquote {
  border-left: 3px solid rgba(0, 0, 0, 0.2);
  padding-left: 1rem;
  color: var(--muted);
}

.doc-content hr {
  border: none;
  border-bottom: 1px solid var(--ink);
  margin: 2rem 0;
}

.section-header {
  display: grid;
  gap: 0.75rem;
}

.section-header h1 {
  font-size: var(--step);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-header p {
  color: var(--muted);
  max-width: 54ch;
  line-height: 1.6;
}

.card-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
}

.card {
  border: 1px solid var(--grid-line);
  padding: 1.5rem;
  display: grid;
  gap: 0.75rem;
  background: rgba(var(--surface-rgb), 0.75);
  backdrop-filter: blur(2px);
}

.card h2 {
  font-size: 1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.card p {
  color: var(--muted);
  margin: 0;
  line-height: 1.5;
}

/* Link grid for icon-based link cards */
.link-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  margin: 1.5rem 0;
}

.link-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--grid-line);
  text-decoration: none;
  color: inherit;
  transition: border-color 160ms ease, background 160ms ease;
}

.link-card:hover {
  border-color: var(--ink);
  background: rgba(0, 0, 0, 0.03);
  text-decoration: none;
}

.link-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.link-title {
  font-weight: 600;
  display: block;
}

.link-desc {
  font-size: 0.85rem;
  color: var(--muted);
  display: block;
}

.footnote {
  border-top: 1px solid var(--grid-line);
  font-size: 0.85rem;
  gap: 1rem;
}

.divider {
  flex: 1;
  border-bottom: 1px dashed var(--grid-line);
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
  display: none;
  position: relative;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--grid-line);
  background: transparent;
  cursor: pointer;
  transition: background 0.2s;
}

.mobile-menu-toggle:hover {
  background: rgba(0, 0, 0, 0.05);
}


.menu-icon {
  display: block;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 2px;
  background: var(--ink);
  transform: translate(-55%, -50%);
  transition: background 0.3s;
}

.menu-icon::before,
.menu-icon::after {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  width: 20px;
  height: 2px;
  background: var(--ink);
  transform: translateX(-52%);
  transform-origin: center;
  transition: transform 0.3s, top 0.3s;
}

.menu-icon::before {
  top: -6px;
}

.menu-icon::after {
  top: 6px;
}

.mobile-menu-toggle[aria-expanded="true"] .menu-icon {
  background: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .menu-icon::before {
  transform: translateX(-52%) rotate(45deg);
  top: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .menu-icon::after {
  transform: translateX(-52%) rotate(-45deg);
  top: 0;
}

/* Tablet and Mobile Styles */
@media (max-width: 960px) {
  body {
    overflow-x: hidden;
  }

  body.menu-open {
    overflow: hidden;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .topbar {
    padding: 1rem;
    gap: 1rem;
    position: relative;
    z-index: 100;
  }

  .brand {
    flex: 1;
    font-size: 1.2rem;
  }

  .layout {
    grid-template-columns: 1fr;
    height: calc(100vh - 120px);
    position: relative;
  }

  .sidebar {
    position: fixed;
    top: 60px;
    left: -100%;
    width: 85%;
    max-width: 320px;
    height: calc(100vh - 60px);
    background: white;
    border-right: 2px solid var(--ink);
    z-index: 99;
    transition: left 0.3s ease;
    overflow-y: auto;
  }

  .sidebar.mobile-open {
    left: 0;
  }

  .sidebar-inner {
    height: 100%;
    padding: 1.5rem;
    overflow-y: auto;
  }

  .nav {
    display: grid;
    gap: 0.5rem;
  }

  .nav-group {
    margin-bottom: 0.5rem;
  }

  .nav-sublist {
    padding-left: 1rem;
  }

  .canvas {
    padding: 1.5rem 0.65rem;
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    max-width: 100%;
    min-width: 0;
    scrollbar-gutter: unset;
  }

  /* Minimal mobile scrollbar */
  .canvas::-webkit-scrollbar {
    width: 3px;
  }

  .canvas::-webkit-scrollbar-track {
    background: transparent;
  }

  .canvas::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 2px;
  }

  .section {
    max-width: 100%;
    min-width: 0;
    overflow-x: hidden;
  }

  .ghost-label {
    display: none;
  }

  .ghost-button {
    padding: 0.6rem;
    min-width: auto;
  }

  .ghost-icon {
    font-size: 1.2rem;
  }

  /* Content adjustments */
  .content {
    font-size: 0.95rem;
    max-width: 100%;
    overflow-wrap: break-word;
    word-wrap: break-word;
  }

  .doc-content {
    padding-right: 1rem;
    max-width: 100%;
    min-width: 0;
    overflow-wrap: break-word;
    word-break: break-word;
  }

  .doc-content table {
    display: block;
    overflow-x: auto;
    max-width: 100%;
  }

  .doc-content pre {
    max-width: 100%;
  }

  .content h2 {
    font-size: 1.4rem;
  }

  .content h3 {
    font-size: 1.2rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .card {
    max-width: 100%;
    overflow: hidden;
  }

  pre {
    font-size: 0.85rem;
    overflow-x: auto;
    max-width: calc(100vw - 3rem);
    margin-left: -0.5rem;
    margin-right: -0.5rem;
    padding: 1rem 0.75rem;
  }

  table {
    display: block;
    overflow-x: auto;
    max-width: 100%;
  }

  /* Prevent images from causing overflow */
  img {
    max-width: 100%;
    height: auto;
  }

  /* Command palette mobile */
  .cmd-surface {
    width: 95%;
    max-width: 400px;
    max-height: 80vh;
  }

  /* Footer mobile */
  .footnote {
    flex-direction: column;
    gap: 0.5rem;
    padding: 1rem;
    text-align: center;
    font-size: 0.8rem;
  }

  .divider {
    display: none;
  }

  /* Special content elements - ensure responsive sizing */
  .mermaid-diagram {
    margin: 1rem 0;
  }

  .mermaid-content {
    max-height: 50vh;
  }

  .mermaid-content svg {
    min-width: 500px;
  }

  .arch-diagram,
  .spec-table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    max-width: 100%;
  }

  .content-box .box-content {
    font-size: 0.7rem;
    line-height: 1.4;
    max-height: 50vh;
    padding: 0.75rem;
  }

  /* HTML blocks with embedded tables/diagrams */
  .html-block {
    margin: 1rem 0;
    border: 1px solid var(--grid-line);
    border-radius: 6px;
    padding: 0;
  }

  .html-block .arch-diagram {
    min-width: 450px;
    border: none;
    border-radius: 0;
  }

  .html-block .arch-diagram caption {
    border-radius: 6px 6px 0 0;
  }

  /* Ensure all SVGs scale properly */
  svg {
    max-width: 100%;
    height: auto;
  }

  /* Feature grids and lists */
  .feature-grid,
  .feature-list {
    display: block;
  }

  .feature-grid > *,
  .feature-list > * {
    margin-bottom: 1rem;
  }

  /* HTML blocks with custom content */
  .html-block {
    max-width: 100%;
    overflow-x: auto;
  }

  /* Bottom navigation responsive */
  .bottom-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: stretch;
  }

  .bottom-nav .bottom-nav-item {
    max-width: 100%;
    width: 100%;
    margin: 0;
    position: relative;
  }

  .bottom-nav .bottom-nav-prev,
  .bottom-nav .bottom-nav-next {
    margin-left: 0;
    margin-right: 0;
  }

  .bottom-nav .bottom-nav-chevron {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    font-size: 1.1rem;
    color: var(--muted);
    pointer-events: none;
  }

  .bottom-nav .bottom-nav-prev .bottom-nav-chevron {
    left: 0.5rem;
  }

  .bottom-nav .bottom-nav-next .bottom-nav-chevron {
    right: 0.5rem;
  }

  .bottom-nav .bottom-nav-link {
    display: block;
    width: 100%;
    text-align: center;
    white-space: normal;
    padding: 0.6rem 2rem;
    font-size: 0.85rem;
  }

  .bottom-nav .bottom-nav-spacer {
    display: none;
  }
}

/* Small mobile screens */
@media (max-width: 480px) {
  .topbar {
    padding: 0.75rem;
  }

  .brand {
    font-size: 1rem;
    letter-spacing: 0.1em;
  }

  .brand-sub {
    display: none;
  }

  .sidebar {
    width: 90%;
  }

  .canvas {
    padding: 1rem 0.75rem;
  }

  .doc-content {
    padding-right: 0.5rem;
  }

  pre {
    max-width: calc(100vw - 2rem);
    margin-left: -0.25rem;
    margin-right: -0.25rem;
    padding: 0.75rem 0.5rem;
    font-size: 0.8rem;
  }

  .content h1 {
    font-size: 1.5rem;
  }

  .content h2 {
    font-size: 1.25rem;
  }

  .content h3 {
    font-size: 1.1rem;
  }

  /* Export modal mobile */
  .export-loading-modal {
    width: 95%;
    max-width: 400px;
    padding: 2rem 1.5rem;
  }

  .export-loading-title {
    font-size: 1rem;
  }

  .export-loading-subtitle {
    font-size: 0.8rem;
  }

  /* Command palette even smaller */
  .cmd-surface {
    width: 100%;
    border-radius: 0;
    max-height: 100vh;
    height: 100vh;
  }
}

@media print {
  mark.hl {
    background: transparent;
    border-bottom: 1px solid rgba(0, 0, 0, 0.2);
  }
}

/* Export Options Modal */
.export-options-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(var(--surface-rgb), 0.9);
  z-index: 9998;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.export-options-overlay.active {
  opacity: 1;
}

.export-options-modal {
  background: white;
  border: 2px solid #000;
  padding: 2rem;
  width: 340px;
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.1);
}

.export-options-header {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  text-align: center;
  font-family: var(--font-mono);
}

.export-options-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.export-option-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 1rem 1.25rem;
  border: 1px solid var(--grid-line);
  background: transparent;
  cursor: pointer;
  text-align: left;
  transition: border-color 160ms ease, background 160ms ease;
}

.export-option-btn:hover {
  border-color: var(--ink);
  background: rgba(0, 0, 0, 0.02);
}

.export-option-title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.export-option-desc {
  font-size: 0.8rem;
  color: var(--muted);
}

.export-cancel-btn {
  width: 100%;
  padding: 0.75rem;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
  transition: color 160ms ease;
}

.export-cancel-btn:hover {
  color: var(--ink);
}

/* Export Loading Overlay */
.export-loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(var(--surface-rgb), 0.98);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.export-loading-overlay.active {
  opacity: 1;
}

.export-loading-modal {
  background: white;
  border: 2px solid #000;
  padding: 3rem;
  width: 630px;
  box-shadow:
    8px 8px 0 rgba(0, 0, 0, 0.1),
    16px 16px 0 rgba(0, 0, 0, 0.05);
  position: relative;
  overflow: hidden;
}

.export-loading-header {
  margin-bottom: 2rem;
  text-align: center;
}

.export-loading-title {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
}

.export-loading-subtitle {
  color: var(--muted);
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

.export-loading-progress {
  margin-bottom: 2rem;
}

.export-loading-bar {
  height: 4px;
  background: rgba(0, 0, 0, 0.1);
  margin-bottom: 1rem;
  position: relative;
  overflow: hidden;
}

.export-loading-fill {
  height: 100%;
  background: #000;
  width: 0%;
  transition: width 0.3s ease;
  position: relative;
}

.export-loading-fill::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 20px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3));
  animation: shimmer 1s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-20px); }
  100% { transform: translateX(20px); }
}

.export-loading-status-container {
  min-height: 20px;
  display: flex;
  align-items: center;
}

.export-loading-status {
  font-size: 0.85rem;
  color: var(--muted);
  font-family: var(--font-mono);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
}

.export-loading-scanner {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  overflow: hidden;
  opacity: 0.3;
}

.scanner-line {
  position: absolute;
  width: 100px;
  height: 100%;
  background: linear-gradient(90deg,
    transparent,
    rgba(0, 0, 0, 0.8) 20%,
    rgba(0, 0, 0, 0.8) 80%,
    transparent);
  animation: scan 2s infinite linear;
}

@keyframes scan {
  0% { transform: translateX(-100px); }
  100% { transform: translateX(calc(100% + 100px)); }
}

/* Cyberpunk grid effect for modal */
.export-loading-modal::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(rgba(0, 0, 0, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
}

.export-loading-modal::after {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg,
    transparent 30%,
    rgba(0, 0, 0, 0.1) 50%,
    transparent 70%);
  animation: borderPulse 3s infinite;
  z-index: -1;
}

@keyframes borderPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.6; }
}

/* ─────────────────────────────────────────────────────────
   Mermaid Diagram Styles
   ───────────────────────────────────────────────────────── */

.mermaid-diagram {
  display: flex;
  flex-direction: column;
  margin: 1.5rem 0;
  background: var(--surface);
  border: 1px solid var(--grid-line);
  border-radius: 6px;
  overflow: hidden;
}

.mermaid-controls {
  display: flex;
  gap: 0.25rem;
  padding: 0.5rem;
  background: rgba(0, 0, 0, 0.03);
  border-bottom: 1px solid var(--grid-line);
}

.mermaid-btn {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
  border: 1px solid var(--grid-line);
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink);
  transition: background 0.15s, border-color 0.15s;
}

.mermaid-btn:hover {
  background: rgba(0, 0, 0, 0.05);
  border-color: var(--ink);
}

.mermaid-btn:active {
  background: rgba(0, 0, 0, 0.1);
}

.mermaid-content {
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  padding: 1rem;
  max-height: 70vh;
}

.mermaid-content svg {
  display: block;
  transition: transform 0.15s ease;
}

.mermaid-diagram svg {
  max-width: none;
  height: auto;
}


/* Hide mermaid code blocks before rendering to prevent FOUC */
pre:has(code.language-mermaid) {
  opacity: 0.5;
  position: relative;
}

pre:has(code.language-mermaid)::after {
  content: 'Loading diagram...';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.875rem;
  color: var(--muted);
}

/* Error state for failed diagram renders */
.mermaid-error-message {
  padding: 0.5rem 1rem;
  margin-bottom: 0.5rem;
  background: rgba(229, 57, 53, 0.1);
  border-left: 3px solid #e53935;
  color: #c62828;
  font-size: 0.875rem;
  border-radius: 0 4px 4px 0;
}

.mermaid-error {
  border-left: 3px solid #e53935;
  background: rgba(229, 57, 53, 0.05);
}

/* ─────────────────────────────────────────────────────────
   Content Box / Panel Styles
   Usage: ```box or ```box:Title
   ───────────────────────────────────────────────────────── */

.content-box {
  margin: 1.5rem 0;
  border: 1px solid var(--grid-line);
  border-radius: 6px;
  background: var(--surface);
  overflow: hidden;
  min-height: 50px;
}

.content-box .box-title {
  padding: 0.75rem 1rem;
  font-weight: 600;
  font-size: 0.9rem;
  background: rgba(0, 0, 0, 0.03);
  border-bottom: 1px solid var(--grid-line);
  color: var(--ink);
}

.content-box .box-content {
  margin: 0;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  white-space: pre;
  overflow-x: auto;
  background: transparent !important;
  border: none !important;
  border-radius: 0 !important;
  display: block !important;
  visibility: visible !important;
  color: var(--ink) !important;
  min-height: 20px;
}

/* Override doc-content pre styles for box-content */
.doc-content .content-box pre.box-content {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 1rem;
}

/* ─────────────────────────────────────────────────────────
   HTML Block Styles
   Usage: ```html - renders raw HTML
   ───────────────────────────────────────────────────────── */

.html-block {
  margin: 1.5rem 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* Architecture diagram table styling */
.arch-diagram {
  width: max-content;
  min-width: 100%;
  border-collapse: collapse;
  border: 2px solid var(--ink);
  font-family: var(--font-body);
  font-size: 0.9rem;
}

.arch-diagram caption {
  font-weight: 700;
  font-size: 1.1rem;
  padding: 0.75rem;
  background: var(--ink);
  color: var(--surface);
  caption-side: top;
}

.arch-diagram td {
  padding: 0.75rem;
  vertical-align: top;
  border: 1px solid var(--grid-line);
}

.arch-diagram .component {
  background: rgba(0, 0, 0, 0.03);
  border: 1px solid var(--grid-line);
  border-radius: 4px;
  padding: 0.75rem;
  text-align: center;
}

.arch-diagram .component-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.arch-diagram .component-desc {
  font-size: 0.8rem;
  color: var(--muted);
}

/* Specification table styling */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}

.spec-table th,
.spec-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border: 1px solid var(--grid-line);
}

.spec-table th {
  background: rgba(0, 0, 0, 0.05);
  font-weight: 600;
}

.spec-table tr:nth-child(even) {
  background: rgba(0, 0, 0, 0.02);
}

.spec-table td:first-child {
  width: 40%;
}

.spec-table td:last-child {
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* Layer stack diagram styling */
.layer-stack {
  display: flex;
  flex-direction: column;
  margin: 1.5rem 0;
  border: 2px solid var(--ink);
  border-radius: 6px;
  overflow: hidden;
}

.layer-stack .layer {
  padding: 1rem 1.25rem;
  text-align: center;
  border-bottom: 1px solid var(--grid-line);
}

.layer-stack .layer:last-child {
  border-bottom: none;
}

.layer-stack .layer:first-child {
  background: rgba(0, 0, 0, 0.02);
}

.layer-stack .layer:nth-child(2) {
  background: rgba(0, 0, 0, 0.04);
}

.layer-stack .layer:nth-child(3) {
  background: rgba(0, 0, 0, 0.06);
}

.layer-stack .layer-title {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.layer-stack .layer-desc,
.layer-stack .layer-detail {
  font-size: 0.85rem;
  color: var(--muted);
}

.arch-diagram .full-width {
  background: rgba(0, 0, 0, 0.05);
}

/* ─────────────────────────────────────────────────────────
   Bottom Page Navigation (Prev/Next)
   ───────────────────────────────────────────────────────── */

.bottom-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--grid-line);
}

.bottom-nav.mobile-only {
  display: none;
}

@media (max-width: 960px) {
  .bottom-nav.mobile-only {
    display: flex;
  }
}

.bottom-nav-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  max-width: 48%;
}

.bottom-nav-prev {
  flex-direction: row;
}

.bottom-nav-next {
  flex-direction: row;
  margin-left: auto;
}

.bottom-nav-chevron {
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--muted);
  line-height: 1;
}

.bottom-nav-link {
  padding: 0.75rem 1rem;
  border: 1px solid var(--grid-line);
  border-radius: 6px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 500;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: border-color 0.15s, background 0.15s;
}

.bottom-nav-link:hover {
  border-color: var(--ink);
  background: rgba(0, 0, 0, 0.03);
}

.bottom-nav-spacer {
  flex: 1;
}

/* ─────────────────────────────────────────────────────────
   Syntax Highlighting (Light theme)
   ───────────────────────────────────────────────────────── */

pre.highlighted {
  background: rgba(0, 0, 0, 0.03);
  color: var(--ink);
}

pre.highlighted code {
  color: var(--ink);
}

/* Tokens */
.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: #6a737d;
  font-style: italic;
}

.token.punctuation {
  color: #24292e;
}

.token.property,
.token.tag,
.token.constant,
.token.symbol,
.token.deleted {
  color: #d73a49;
}

.token.boolean,
.token.number {
  color: #005cc5;
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
  color: #22863a;
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string {
  color: #d73a49;
}

.token.atrule,
.token.attr-value,
.token.keyword {
  color: #d73a49;
}

.token.function,
.token.class-name {
  color: #6f42c1;
}

.token.regex,
.token.important,
.token.variable {
  color: #e36209;
}

.token.important,
.token.bold {
  font-weight: bold;
}

.token.italic {
  font-style: italic;
}