:root {
  color-scheme: light;
  --bg: oklch(1 0 0);
  --surface: oklch(0.972 0.005 230);
  --surface-strong: oklch(0.94 0.008 230);
  --ink: oklch(0.18 0.015 230);
  --ink-soft: oklch(0.44 0.018 230);
  --line: oklch(0.86 0.01 230);
  --line-strong: oklch(0.68 0.025 230);
  --primary: oklch(0.55 0.105 230);
  --primary-strong: oklch(0.43 0.115 230);
  --accent: oklch(0.62 0.16 25);
  --focus: oklch(0.66 0.15 230);
  --scrim: oklch(0.12 0.01 230 / 0.42);
  --canvas-dot: oklch(0.72 0.012 230 / 0.35);
  --topbar-height: 64px;
  --radius-s: 8px;
  --radius-m: 12px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: oklch(0.12 0 0);
  --surface: oklch(0.17 0.007 230);
  --surface-strong: oklch(0.22 0.01 230);
  --ink: oklch(0.94 0.006 230);
  --ink-soft: oklch(0.72 0.015 230);
  --line: oklch(0.3 0.012 230);
  --line-strong: oklch(0.46 0.025 230);
  --primary: oklch(0.68 0.11 230);
  --primary-strong: oklch(0.78 0.095 230);
  --accent: oklch(0.72 0.15 25);
  --focus: oklch(0.76 0.13 230);
  --scrim: oklch(0.04 0 0 / 0.7);
  --canvas-dot: oklch(0.44 0.012 230 / 0.28);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
}

body,
button,
input {
  font: inherit;
}

button,
a,
input {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

svg {
  display: block;
}

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

.skip-link {
  position: fixed;
  z-index: 50;
  inset: 12px auto auto 12px;
  translate: 0 -160%;
  padding: 10px 14px;
  border-radius: var(--radius-s);
  background: var(--ink);
  color: var(--bg);
  font-weight: 700;
  text-decoration: none;
  transition: translate 160ms var(--ease-out);
}

.skip-link:focus {
  translate: 0;
}

.app {
  display: grid;
  grid-template-rows: var(--topbar-height) minmax(0, 1fr);
  width: 100%;
  height: 100%;
  background: var(--bg);
}

.topbar {
  z-index: 10;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 20px;
  min-width: 0;
  padding: env(safe-area-inset-top) max(16px, env(safe-area-inset-right)) 0 max(16px, env(safe-area-inset-left));
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}

.brand {
  color: var(--ink);
  font-size: 1.08rem;
  font-weight: 790;
  letter-spacing: -0.025em;
  text-decoration: none;
}

.brand::after {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin: 0 0 9px 3px;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.topbar-context {
  min-width: 0;
  margin: 0;
  overflow: hidden;
  color: var(--ink-soft);
  font-size: 0.85rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.icon-button,
.text-button,
.canvas-controls button {
  display: inline-grid;
  place-items: center;
  min-width: 40px;
  min-height: 40px;
  border: 0;
  border-radius: var(--radius-s);
  background: transparent;
  cursor: pointer;
  transition: background-color 120ms ease, color 120ms ease, transform 120ms var(--ease-out);
}

.icon-button:hover,
.text-button:hover,
.canvas-controls button:hover {
  background: var(--surface-strong);
}

.icon-button:active,
.text-button:active,
.canvas-controls button:active {
  transform: scale(0.96);
}

.icon-button svg,
.canvas-controls button svg,
.reader-search svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.text-button {
  display: inline-flex;
  min-width: 0;
  padding: 0 13px;
  background: var(--ink);
  color: var(--bg);
  font-size: 0.84rem;
  font-weight: 720;
}

.text-button:hover {
  background: var(--primary-strong);
}

.theme-icon-dark,
:root[data-theme="dark"] .theme-icon-light {
  display: none;
}

:root[data-theme="dark"] .theme-icon-dark {
  display: block;
}

.canvas-shell,
.canvas-viewport {
  min-width: 0;
  min-height: 0;
  width: 100%;
  height: 100%;
}

.canvas-viewport {
  position: relative;
  overflow: hidden;
  touch-action: none;
  cursor: grab;
  background-color: var(--bg);
  background-image: radial-gradient(circle, var(--canvas-dot) 1px, transparent 1px);
  background-position: 0 0;
  background-size: 24px 24px;
  overscroll-behavior: none;
}

.canvas-viewport.is-panning {
  cursor: grabbing;
  user-select: none;
}

.canvas-world {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
  transform-origin: 0 0;
  will-change: transform;
}

.canvas-edges,
.canvas-nodes {
  position: absolute;
  inset: 0;
  overflow: visible;
}

.canvas-edges {
  pointer-events: none;
}

.canvas-edge {
  fill: none;
  stroke: var(--edge-color, var(--line-strong));
  stroke-linecap: round;
  stroke-width: 3;
  vector-effect: non-scaling-stroke;
}

.canvas-edge-label {
  fill: var(--ink-soft);
  font-size: 13px;
  font-weight: 650;
  paint-order: stroke;
  stroke: var(--bg);
  stroke-width: 5px;
  stroke-linejoin: round;
}

.canvas-node {
  --node-accent: var(--line-strong);
  position: absolute;
  display: flex;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border: 1px solid color-mix(in oklch, var(--node-accent) 54%, var(--line));
  border-radius: var(--radius-m);
  background: color-mix(in oklch, var(--node-accent) 4%, var(--surface));
  color: var(--ink);
  cursor: default;
  contain: layout paint style;
  transition: border-color 140ms ease, background-color 140ms ease, outline-color 140ms ease;
}

.canvas-node:hover {
  border-color: color-mix(in oklch, var(--node-accent) 76%, var(--line-strong));
}

.canvas-node.is-selected {
  outline: 4px solid color-mix(in oklch, var(--primary) 65%, transparent);
  outline-offset: 4px;
}

.canvas-node[data-color]:not([data-color=""]) {
  background: color-mix(in oklch, var(--node-accent) 10%, var(--surface));
}

.node-body {
  width: 100%;
  height: 100%;
  padding: 18px 20px;
  overflow: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
  transition: opacity 100ms ease;
}

.canvas-world.is-overview .node-body,
.canvas-world.is-overview .link-node-inner {
  opacity: 0;
  pointer-events: none;
}

.canvas-world.is-overview .canvas-node {
  border-width: 2px;
  background: color-mix(in oklch, var(--node-accent) 28%, var(--surface));
}

.markdown {
  font-size: 16px;
  line-height: 1.52;
  overflow-wrap: anywhere;
}

.canvas-node.is-selected .markdown {
  font-size: clamp(12px, calc(16px * var(--inverse-scale, 1)), 36px);
}

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

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

.markdown h1,
.markdown h2,
.markdown h3,
.markdown h4 {
  margin: 1em 0 0.46em;
  color: var(--ink);
  font-weight: 780;
  letter-spacing: -0.028em;
  line-height: 1.14;
  text-wrap: balance;
}

.markdown h1 { font-size: 1.85em; }
.markdown h2 { font-size: 1.52em; }
.markdown h3 { font-size: 1.24em; }
.markdown h4 { font-size: 1.08em; }

.markdown p {
  margin: 0.62em 0;
  text-wrap: pretty;
}

.markdown ul,
.markdown ol {
  margin: 0.58em 0;
  padding-left: 1.4em;
}

.markdown li + li {
  margin-top: 0.28em;
}

.markdown blockquote {
  margin: 0.8em 0;
  padding: 0.72em 0.85em;
  border: 1px solid color-mix(in oklch, var(--primary) 30%, var(--line));
  border-radius: var(--radius-s);
  background: color-mix(in oklch, var(--primary) 7%, var(--surface));
  color: var(--ink-soft);
}

.markdown .callout-title {
  display: block;
  margin-bottom: 0.4em;
  color: var(--primary-strong);
  font-weight: 760;
}

.markdown mark {
  padding: 0.04em 0.12em;
  border-radius: 3px;
  background: color-mix(in oklch, var(--accent) 20%, transparent);
  color: inherit;
}

.markdown a {
  color: var(--primary-strong);
  font-weight: 650;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
}

.markdown a:hover {
  text-decoration-thickness: 2px;
}

.markdown code {
  padding: 0.1em 0.28em;
  border-radius: 4px;
  background: var(--surface-strong);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.88em;
}

.link-node {
  padding: 0;
  background: var(--surface);
}

.link-node-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  transition: opacity 100ms ease;
}

.link-media {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
  background: var(--surface-strong);
}

.link-media img,
.link-media iframe {
  width: 100%;
  height: 100%;
  border: 0;
  object-fit: cover;
}

.link-media iframe {
  position: absolute;
  inset: 0;
  background: var(--surface);
}

.link-placeholder {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  min-height: 88px;
  padding: 18px;
  color: var(--ink-soft);
  text-align: center;
}

button.link-placeholder {
  border: 0;
  color: var(--ink-soft);
  cursor: pointer;
  font: inherit;
}

.media-trigger {
  position: absolute;
  z-index: 1;
  inset: 0;
  background: color-mix(in oklch, var(--surface) 72%, transparent);
  transition: background-color 140ms ease;
}

.media-trigger:hover {
  background: color-mix(in oklch, var(--surface) 88%, transparent);
  color: var(--primary-strong);
}

.link-placeholder svg {
  width: 32px;
  height: 32px;
  margin-bottom: 10px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
}

.link-info {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  flex: 0 0 auto;
  padding: 14px 16px;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.link-copy {
  min-width: 0;
}

.link-domain,
.link-title {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.link-domain {
  margin-bottom: 3px;
  color: var(--ink-soft);
  font-size: 12px;
}

.link-title {
  color: var(--ink);
  font-size: 14px;
  font-weight: 720;
}

.link-actions {
  display: flex;
  align-items: center;
  gap: 5px;
}

.link-action {
  display: inline-grid;
  place-items: center;
  min-width: 36px;
  min-height: 36px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
}

.link-action:hover {
  border-color: var(--line-strong);
  background: var(--surface-strong);
}

.link-action svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.embed-notice {
  position: absolute;
  inset: auto 10px 10px;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-s);
  background: oklch(0.12 0 0 / 0.88);
  color: oklch(0.97 0 0);
  font-size: 11px;
}

.loading-state {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--bg);
  color: var(--ink-soft);
  font-size: 0.9rem;
  transition: opacity 240ms ease;
}

.app:not([aria-busy="true"]) .loading-state {
  opacity: 0;
  pointer-events: none;
}

.loading-mark {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  animation: loading-pulse 900ms ease-in-out infinite alternate;
}

@keyframes loading-pulse {
  to { transform: scale(1.65); opacity: 0.45; }
}

.canvas-hint {
  position: absolute;
  bottom: 18px;
  left: 50%;
  display: flex;
  gap: 16px;
  translate: -50% 0;
  color: var(--ink-soft);
  font-size: 11px;
  white-space: nowrap;
  transition: opacity 260ms ease 4s;
}

.canvas-viewport.has-interacted .canvas-hint {
  opacity: 0;
}

kbd {
  display: inline-block;
  min-width: 1.5em;
  padding: 0.08em 0.35em;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--surface);
  color: var(--ink-soft);
  font-family: inherit;
  font-size: 0.92em;
  text-align: center;
}

.canvas-controls {
  position: absolute;
  bottom: max(16px, env(safe-area-inset-bottom));
  left: max(16px, env(safe-area-inset-left));
  display: flex;
  align-items: center;
  gap: 2px;
  min-height: 44px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--bg);
}

.canvas-controls button {
  min-width: 38px;
  min-height: 38px;
}

#zoom-level {
  width: 48px;
  color: var(--ink-soft);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.control-divider {
  width: 1px;
  height: 24px;
  margin: 0 3px;
  background: var(--line);
}

.minimap {
  position: absolute;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  width: 184px;
  height: 116px;
  overflow: hidden;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--bg);
  cursor: crosshair;
}

.minimap:hover {
  border-color: var(--line-strong);
}

.minimap svg {
  width: 100%;
  height: 100%;
}

.minimap-node {
  fill: var(--line-strong);
  opacity: 0.72;
}

.minimap-node.is-accented {
  fill: var(--primary);
}

.minimap-viewport {
  fill: color-mix(in oklch, var(--primary) 10%, transparent);
  stroke: var(--primary-strong);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}

dialog {
  color: var(--ink);
}

dialog::backdrop {
  background: var(--scrim);
  backdrop-filter: blur(2px);
}

.panel-dialog {
  width: min(560px, 100%);
  max-width: none;
  height: 100%;
  max-height: none;
  margin: 0 0 0 auto;
  padding: 0;
  border: 0;
  border-left: 1px solid var(--line);
  background: var(--bg);
}

.panel-dialog[open] {
  animation: panel-in 260ms var(--ease-out);
}

@keyframes panel-in {
  from { translate: 28px 0; opacity: 0; }
}

.panel-shell {
  display: grid;
  grid-template-rows: auto auto auto minmax(0, 1fr);
  height: 100%;
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 28px 20px;
}

.panel-header h1,
.compact-dialog h1 {
  margin: 0;
  font-size: 1.5rem;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.panel-header p {
  max-width: 42ch;
  margin: 7px 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.45;
}

.reader-search {
  position: relative;
  display: block;
  margin: 0 28px;
}

.reader-search svg {
  position: absolute;
  top: 50%;
  left: 13px;
  width: 18px;
  height: 18px;
  translate: 0 -50%;
  color: var(--ink-soft);
  pointer-events: none;
}

.reader-search input {
  width: 100%;
  height: 44px;
  padding: 0 14px 0 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: var(--surface);
  color: var(--ink);
  outline: 0;
}

.reader-search input::placeholder {
  color: var(--ink-soft);
  opacity: 1;
}

.reader-search input:focus {
  border-color: var(--primary);
}

.reader-count {
  margin: 14px 28px 8px;
  color: var(--ink-soft);
  font-size: 0.78rem;
}

.reader-list {
  margin: 0;
  padding: 0 28px 40px;
  overflow: auto;
  list-style: none;
}

.reader-item {
  border-top: 1px solid var(--line);
}

.reader-item:last-child {
  border-bottom: 1px solid var(--line);
}

.reader-item details {
  padding: 0;
}

.reader-item summary {
  padding: 17px 2px;
  cursor: pointer;
  list-style: none;
}

.reader-item summary::-webkit-details-marker {
  display: none;
}

.reader-item summary:hover .reader-title {
  color: var(--primary-strong);
}

.reader-full {
  padding: 4px 2px 20px;
  font-size: 0.92rem;
}

.reader-item .reader-map-action {
  display: block;
  width: auto;
  margin-top: 16px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 720;
}

.reader-item .reader-map-action:hover {
  border-color: var(--line-strong);
  background: var(--surface-strong);
}

.reader-title,
.reader-excerpt,
.reader-meta {
  display: block;
}

.reader-title {
  margin-bottom: 5px;
  font-weight: 740;
  line-height: 1.3;
  text-wrap: pretty;
}

.reader-excerpt {
  display: -webkit-box;
  overflow: hidden;
  color: var(--ink-soft);
  font-size: 0.86rem;
  line-height: 1.48;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.reader-meta {
  margin-top: 8px;
  color: var(--primary-strong);
  font-size: 0.72rem;
  font-weight: 700;
}

.reader-empty {
  padding: 36px 0;
  color: var(--ink-soft);
  text-align: center;
}

.compact-dialog {
  width: min(440px, calc(100% - 32px));
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--bg);
}

.compact-dialog form {
  padding: 24px;
}

.compact-dialog header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.shortcut-list {
  margin: 24px 0 0;
}

.shortcut-list div {
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 14px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.shortcut-list dt {
  font-weight: 720;
}

.shortcut-list dd {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.45;
}

.help-note {
  margin: 14px 0 0;
  padding: 13px;
  border-radius: var(--radius-s);
  background: var(--surface);
  color: var(--ink-soft);
  font-size: 0.82rem;
  line-height: 1.5;
}

.noscript-message {
  position: fixed;
  z-index: 100;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 32px;
  background: var(--bg);
  text-align: center;
}

@media (max-width: 760px) {
  :root {
    --topbar-height: 58px;
  }

  .topbar {
    grid-template-columns: auto 1fr;
    gap: 10px;
    padding-inline: 12px;
  }

  .topbar-context,
  .topbar-actions .text-button,
  .topbar-actions [data-action="help"] {
    display: none;
  }

  .topbar-actions {
    justify-self: end;
  }

  .canvas-hint {
    bottom: 78px;
  }

  .canvas-hint span:not(:first-child) {
    display: none;
  }

  .canvas-controls {
    left: 10px;
    bottom: max(10px, env(safe-area-inset-bottom));
  }

  .canvas-controls [data-action="zoom-in"],
  .canvas-controls [data-action="zoom-out"],
  #zoom-level,
  .control-divider {
    display: none;
  }

  .minimap {
    right: 10px;
    bottom: max(10px, env(safe-area-inset-bottom));
    width: 132px;
    height: 84px;
  }

  .panel-dialog {
    width: 100%;
    border-left: 0;
  }

  .panel-header {
    padding: 20px 18px 16px;
  }

  .reader-search {
    margin-inline: 18px;
  }

  .reader-count {
    margin-inline: 18px;
  }

  .reader-list {
    padding-inline: 18px;
  }
}

@media (max-width: 360px) {
  .brand {
    font-size: 1rem;
  }

  .icon-button {
    min-width: 38px;
  }

  .minimap {
    width: 116px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }
}

@media print {
  html,
  body {
    height: auto;
    overflow: visible;
  }

  .app,
  dialog,
  .skip-link {
    display: none;
  }

  #reader-dialog {
    position: static;
    display: block;
    width: auto;
    height: auto;
    border: 0;
  }

  .panel-header .icon-button,
  .reader-search {
    display: none;
  }

  .reader-list {
    overflow: visible;
  }
}