:root {
  color-scheme: light;
  --background: #f6f6f3;
  --surface: #ffffff;
  --surface-raised: #fbfbf9;
  --foreground: #242422;
  --secondary: #565651;
  --tertiary: #696963;
  --border: #dfdfd9;
  --border-strong: #cecec6;
  --hover: #ecece7;
  --selected: #e5ebf5;
  --accent: #28599f;
  --accent-strong: #1f4d8e;
  --accent-soft: #e8eef8;
  --ring: #28599f;
  --positive: #24864a;
  --shadow: 0 16px 44px rgba(28, 32, 40, .16);
  --topbar: calc(56px + env(safe-area-inset-top, 0px));
  --notebooks: 214px;
  --notes: 336px;
}

[data-theme="dark"] {
  color-scheme: dark;
  --background: #181817;
  --surface: #20201f;
  --surface-raised: #252523;
  --foreground: #f0f0ec;
  --secondary: #c3c3bc;
  --tertiary: #aaa9a2;
  --border: #393936;
  --border-strong: #4b4b46;
  --hover: #2d2d2a;
  --selected: #2d394c;
  --accent: #9ab9ea;
  --accent-strong: #b5cdf1;
  --accent-soft: #28364c;
  --ring: #9ab9ea;
  --positive: #63c989;
  --shadow: 0 18px 48px rgba(0, 0, 0, .42);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  overflow: hidden;
  background: var(--background);
  color: var(--foreground);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: rgba(40, 89, 159, .12); }
a { color: inherit; }
svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }
[hidden] { display: none !important; }
.drawer-only, .single-pane-only { display: none !important; }
.visually-hidden {
  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;
  top: calc(var(--topbar) + 8px);
  left: 10px;
  z-index: 100;
  width: 1px;
  height: 1px;
  padding: 9px 13px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  clip-path: inset(50%);
  opacity: 0;
  white-space: nowrap;
  text-decoration: none;
}
.skip-link:focus-visible {
  width: auto;
  height: auto;
  overflow: visible;
  clip-path: none;
  opacity: 1;
}

.topbar {
  position: relative;
  z-index: 40;
  height: var(--topbar);
  padding: env(safe-area-inset-top, 0px) max(12px, env(safe-area-inset-right, 0px)) 0 max(12px, env(safe-area-inset-left, 0px));
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-raised) 94%, transparent);
  backdrop-filter: blur(14px);
}
.topbar-start, .topbar-actions, .brand, .sync-label { display: flex; align-items: center; }
.topbar-start, .topbar-actions { gap: 6px; }
.brand {
  min-height: 44px;
  gap: 9px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 690;
  letter-spacing: -.01em;
}
.brand-mark {
  width: 29px;
  height: 29px;
  display: block;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(15, 23, 42, .2);
}
.sync-label { gap: 7px; color: var(--secondary); font-size: 12px; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--positive); }
.icon-button {
  width: 44px;
  height: 44px;
  padding: 0;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 9px;
  color: var(--secondary);
  background: transparent;
  cursor: pointer;
  transition: background-color 150ms ease, color 150ms ease, transform 100ms ease;
}
.icon-button:hover { color: var(--foreground); background: var(--hover); }
.icon-button:active { transform: scale(.96); background: var(--selected); }
.moon-icon { display: none; }
[data-theme="dark"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: block; }
.reader-control { transition: background-color 150ms ease, color 150ms ease, transform 100ms ease, opacity 150ms ease; }
body:not(.note-open) .reader-control { visibility: hidden; opacity: 0; pointer-events: none; }
.font-size-symbol { font-family: Georgia, "Times New Roman", serif; font-size: 16px; font-weight: 700; letter-spacing: -.08em; }

.notebook-layout {
  height: calc(var(--app-height) - var(--topbar));
  display: grid;
  grid-template-columns: var(--notebooks) var(--notes) minmax(0, 1fr);
}
.notebooks-pane, .notes-pane, .reader { min-width: 0; min-height: 0; }
.notebooks-pane {
  padding: 12px 9px max(10px, env(safe-area-inset-bottom, 0px));
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--background);
}
.pane-heading {
  min-height: 38px;
  padding: 3px 9px 7px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--secondary);
  font-size: 12px;
  font-weight: 720;
  letter-spacing: .05em;
}
.notebook-nav { display: grid; gap: 2px; overflow-y: auto; }
.notebook-link {
  width: 100%;
  min-height: 44px;
  padding: 9px;
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  border: 0;
  border-radius: 8px;
  color: var(--secondary);
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: background-color 140ms ease, color 140ms ease, transform 100ms ease;
}
.notebook-link:hover { color: var(--foreground); background: var(--hover); }
.notebook-link:active { transform: scale(.985); }
.notebook-link.active { color: var(--foreground); background: var(--selected); font-weight: 680; }
.notebook-link svg { width: 18px; height: 18px; }
.notebook-link span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.notebook-link small { color: var(--tertiary); font-size: 12px; font-variant-numeric: tabular-nums; }
.notebooks-footer {
  margin-top: auto;
  padding: 14px 9px 4px;
  border-top: 1px solid var(--border);
  color: var(--tertiary);
  font-size: 12px;
}
.notebooks-footer p { margin: 0 0 3px; }
.notebooks-footer a { min-height: 32px; display: inline-flex; align-items: center; color: var(--secondary); text-decoration: none; }
.notebooks-footer a:hover { color: var(--accent); }

.notes-pane {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--surface-raised);
}
.notes-toolbar { flex: 0 0 auto; padding: 13px; border-bottom: 1px solid var(--border); }
.compact-search {
  min-height: 42px;
  padding: 0 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  background: var(--surface);
  transition: border-color 140ms ease, box-shadow 140ms ease;
}
.compact-search:focus-within { border-color: var(--ring); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ring) 15%, transparent); }
.compact-search svg { flex: 0 0 auto; width: 17px; height: 17px; color: var(--secondary); }
.compact-search input { width: 100%; min-width: 0; border: 0; outline: 0; color: var(--foreground); background: transparent; font-size: 14px; }
.compact-search input::placeholder { color: var(--tertiary); opacity: 1; }
kbd {
  padding: 2px 6px;
  border: 1px solid var(--border-strong);
  border-radius: 5px;
  color: var(--secondary);
  background: var(--background);
  font-size: 10px;
  line-height: 1.5;
  white-space: nowrap;
}
.list-heading { min-height: 38px; padding: 13px 2px 0; display: flex; align-items: end; gap: 10px; }
.list-heading h1 { margin: 0; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 18px; line-height: 1.3; letter-spacing: -.025em; }
.list-heading > span:not(.visually-hidden) { margin-left: auto; flex: 0 0 auto; color: var(--tertiary); font-size: 12px; }
.notes-list { min-height: 0; overflow-y: auto; overscroll-behavior: contain; }
.note-row {
  width: 100%;
  min-height: 108px;
  padding: 14px 15px;
  display: block;
  border-bottom: 1px solid var(--border);
  color: inherit;
  background: transparent;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 140ms ease, box-shadow 140ms ease;
}
.note-row:hover { background: var(--hover); }
.note-row:active { background: var(--selected); }
.note-row.active { background: var(--selected); box-shadow: inset 3px 0 0 var(--accent); }
.note-row-meta { display: flex; align-items: center; justify-content: space-between; gap: 8px; color: var(--tertiary); font-size: 11px; }
.note-row-meta > span:first-child { color: var(--accent); font-weight: 700; }
.note-row-status { display: inline-flex; align-items: center; gap: 6px; }
.pinned-label { color: var(--secondary); }
.pinned-label::before { content: "•"; margin-right: 5px; color: var(--accent); }
.note-row h2 { margin: 7px 0 4px; display: -webkit-box; overflow: hidden; -webkit-box-orient: vertical; -webkit-line-clamp: 2; font-size: 14px; line-height: 1.42; letter-spacing: -.012em; }
.note-row p { margin: 0; display: -webkit-box; overflow: hidden; -webkit-box-orient: vertical; -webkit-line-clamp: 2; color: var(--secondary); font-size: 12px; line-height: 1.5; }
.note-row mark { padding: 0 1px; border-radius: 2px; color: var(--foreground); background: #ffe08a; }
[data-theme="dark"] .note-row mark { color: #191816; background: #e4bd59; }
.note-row p.search-snippet { color: var(--foreground); }
.empty-state, .reader-error, .reader-loading, .offline-card, .load-error { text-align: center; }
.empty-state, .load-error { margin: auto; padding: 28px 22px max(28px, env(safe-area-inset-bottom, 0px)); justify-items: center; color: var(--secondary); }
.empty-state:not([hidden]), .load-error:not([hidden]) { display: grid; }
.empty-state svg { width: 28px; height: 28px; color: var(--tertiary); }
.empty-state strong, .load-error strong { color: var(--foreground); font-size: 15px; }
.empty-state p, .load-error p { margin: -3px 0 2px; font-size: 12px; }
.empty-state button, .primary-button, .secondary-button {
  min-height: 44px;
  padding: 0 15px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 8px;
  color: var(--accent);
  background: transparent;
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
}
.primary-button { color: #fff; background: #28599f; }
.primary-button:hover { background: #1f4d8e; }
.secondary-button { border: 1px solid var(--border-strong); color: var(--foreground); background: var(--surface); }

.reader { position: relative; overflow-y: auto; overscroll-behavior: contain; background: var(--surface); scroll-padding-top: 24px; }
.reading-progress { position: sticky; z-index: 30; top: 0; height: 3px; overflow: hidden; background: transparent; pointer-events: none; opacity: 0; }
.reading-progress.active { opacity: 1; }
.reading-progress span { width: 100%; height: 100%; display: block; background: var(--accent); transform: scaleX(0); transform-origin: left center; transition: transform 80ms linear; }
.reader-empty { height: calc(100% - 3px); display: grid; align-content: center; justify-items: center; gap: 10px; color: var(--tertiary); }
.reader-empty svg { width: 32px; height: 32px; }
.reader-empty p { margin: 0; font-size: 12px; }
.reader-loading { min-height: 70vh; display: grid; place-content: center; justify-items: center; gap: 11px; color: var(--secondary); font-size: 13px; }
.loading-spinner { width: 24px; height: 24px; border: 2px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
#article-view { width: min(calc(100% - 56px), 1040px); margin: 0 auto; padding: 42px 0 max(88px, calc(60px + env(safe-area-inset-bottom, 0px))); }
#article-view:focus { outline: none; }
.article-main { width: min(100%, 720px); margin: 0 auto; }
.article-header { padding-bottom: 25px; border-bottom: 1px solid var(--border); }
.article-kicker { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }
.category-tag, .evergreen-label { font-size: 12px; font-weight: 720; text-decoration: none; }
.category-tag { min-height: 30px; display: inline-flex; align-items: center; color: var(--accent); }
.category-tag:hover { color: var(--accent-strong); text-decoration: underline; text-underline-offset: 3px; }
.evergreen-label { padding: 2px 7px; border-radius: 99px; color: var(--secondary); background: var(--hover); font-size: 10px; }
.article-header h1 { max-width: 20ch; margin: 10px 0 12px; font-size: clamp(28px, 3vw, 39px); line-height: 1.23; letter-spacing: -.038em; text-wrap: balance; }
.article-summary { max-width: 62ch; margin: 0 0 16px; color: var(--secondary); font-size: 15px; line-height: 1.7; }
.article-toolbar { min-height: 38px; display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.article-meta { margin: 0; display: flex; align-items: center; gap: 7px; color: var(--tertiary); font-size: 12px; font-variant-numeric: tabular-nums; }
.share-button, .back-to-top {
  min-height: 40px;
  padding: 0 10px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 0;
  border-radius: 8px;
  color: var(--secondary);
  background: transparent;
  cursor: pointer;
}
.share-button svg, .back-to-top svg { width: 17px; height: 17px; }
.share-button:hover, .back-to-top:hover { color: var(--foreground); background: var(--hover); }
.share-button:active, .back-to-top:active { background: var(--selected); }
.tag-list { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 6px; }
.tag { min-height: 30px; padding: 3px 8px; display: inline-flex; align-items: center; border: 1px solid var(--border); border-radius: 7px; color: var(--secondary); background: var(--surface-raised); font-size: 11px; text-decoration: none; }
.tag::before { content: "#"; margin-right: 2px; color: var(--tertiary); }
.tag:hover { border-color: var(--border-strong); color: var(--foreground); }
.article-body { padding-top: 25px; color: var(--foreground); font-size: 16px; line-height: 1.84; }
.article-body .lead { margin-top: 0; color: var(--secondary); font-size: 17px; line-height: 1.78; }
.article-body h2, .article-body h3 { position: relative; scroll-margin-top: 24px; }
.article-body h2 { margin: 42px 0 12px; font-size: 22px; line-height: 1.4; letter-spacing: -.025em; }
.article-body h3 { margin: 28px 0 9px; font-size: 17px; line-height: 1.5; letter-spacing: -.012em; }
.heading-link { margin-left: 8px; color: var(--tertiary); opacity: 0; font-size: .8em; font-weight: 500; text-decoration: none; transition: opacity 130ms ease, color 130ms ease; }
.article-body h2:hover .heading-link, .article-body h3:hover .heading-link, .heading-link:focus-visible { opacity: 1; color: var(--accent); }
.article-body p, .article-body ul, .article-body ol { max-width: 68ch; }
.article-body p { margin-block: 1em; }
.article-body ul, .article-body ol { padding-left: 1.45em; }
.article-body li { margin: 6px 0; padding-left: .16em; }
.article-body strong { font-weight: 720; }
.article-body a:not(.heading-link) { color: var(--accent); text-underline-offset: 3px; }
.article-body blockquote { margin: 25px 0; padding: 15px 17px; border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0; color: var(--secondary); background: var(--accent-soft); }
.article-body blockquote p { margin: 4px 0; }
.article-body blockquote strong { color: var(--foreground); }
.article-body .article-illustration { min-width: 0; max-width: 100%; margin: 28px 0; }
.article-illustration > a { display: block; overflow: hidden; border: 1px solid var(--border-strong); border-radius: 10px; background: #fff; cursor: zoom-in; }
.article-illustration > a:hover { border-color: var(--accent); }
.article-illustration > a:focus-visible { outline: 2px solid var(--ring); outline-offset: 4px; }
.article-illustration img { display: block; width: 100%; max-width: 100%; height: auto; }
.article-illustration figcaption { margin-top: 9px; color: var(--secondary); font-size: .8125em; line-height: 1.7; overflow-wrap: anywhere; }
.article-illustration figcaption span { display: block; margin-top: 3px; color: var(--accent); }
.article-body .article-table { max-width: 100%; min-width: 0; margin: 24px 0; }
.article-table figcaption { margin-bottom: 6px; color: var(--foreground); font-size: .875em; font-weight: 680; line-height: 1.6; }
.article-body .table-hint { margin: 0 0 10px; color: var(--secondary); font-size: .8125em; line-height: 1.6; }
.table-scroll {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--surface);
  scrollbar-width: auto;
  scrollbar-color: var(--border-strong) var(--surface-raised);
}
.table-scroll:focus-visible { outline: 2px solid var(--ring); outline-offset: 3px; }
.article-body table { width: 100%; border-collapse: separate; border-spacing: 0; font: inherit; line-height: 1.7; text-align: left; }
.article-table table { min-width: 36em; }
.article-table[data-columns="2"] table { min-width: 28em; }
.article-table[data-columns="4"] table { min-width: 44em; }
.article-body th, .article-body td {
  min-width: 8em;
  padding: 12px 16px;
  border-right: 1px solid var(--border-strong);
  border-bottom: 1px solid var(--border-strong);
  vertical-align: top;
  white-space: normal;
  overflow-wrap: anywhere;
}
.article-body th { background: var(--accent-soft); color: var(--foreground); font-weight: 720; text-align: left; }
.article-body td:first-child { font-weight: 620; }
.article-body th:first-child, .article-body td:first-child { min-width: 7em; width: 24%; }
.article-body th:last-child, .article-body td:last-child { border-right: 0; }
.article-body tbody tr:last-child td { border-bottom: 0; }
.article-body tbody tr:nth-child(even) { background: var(--surface-raised); }
.article-body .course-source { display: block; }
.article-body .course-source > p { margin-inline: 14px; overflow-wrap: anywhere; }
[data-reader-size="large"] .article-body { font-size: 18px; line-height: 1.82; }
[data-reader-size="large"] .article-body .lead { font-size: 19px; }
[data-reader-size="xlarge"] .article-body { font-size: 20px; line-height: 1.78; }
[data-reader-size="xlarge"] .article-body .lead { font-size: 21px; }
.compact-outline { margin: 22px 0 4px; border: 1px solid var(--border); border-radius: 9px; background: var(--surface-raised); }
.compact-outline summary { min-height: 46px; padding: 10px 13px; display: flex; align-items: center; justify-content: space-between; gap: 12px; color: var(--foreground); font-weight: 680; cursor: pointer; list-style: none; }
.compact-outline summary::-webkit-details-marker { display: none; }
.compact-outline summary::after { content: "+"; margin-left: auto; color: var(--tertiary); font-size: 18px; font-weight: 400; }
.compact-outline[open] summary::after { content: "−"; }
.compact-outline summary span { color: var(--tertiary); font-size: 11px; font-weight: 500; }
.compact-outline nav { padding: 0 13px 12px; border-top: 1px solid var(--border); }
.compact-outline ol, .desktop-outline ol { margin: 9px 0 0; padding: 0; list-style: none; }
.compact-outline li { margin: 1px 0; }
.compact-outline a { min-height: 36px; padding: 6px 3px; display: flex; align-items: center; color: var(--secondary); font-size: 12px; line-height: 1.45; text-decoration: none; }
.compact-outline .outline-level-3 { padding-left: 15px; }
.compact-outline a:hover, .compact-outline a[aria-current="location"] { color: var(--accent); }
.desktop-outline { display: none; position: sticky; top: 25px; max-height: calc(100dvh - var(--topbar) - 50px); overflow-y: auto; align-self: start; }
.outline-title { margin: 0 0 10px; color: var(--tertiary); font-size: 11px; font-weight: 720; letter-spacing: .05em; }
.desktop-outline li { margin: 2px 0; }
.desktop-outline .outline-level-3 { padding-left: 13px; }
.desktop-outline a { padding: 5px 0 5px 10px; display: block; border-left: 2px solid var(--border); color: var(--tertiary); font-size: 11px; line-height: 1.45; text-decoration: none; transition: color 130ms ease, border-color 130ms ease; }
.desktop-outline a:hover, .desktop-outline a[aria-current="location"] { border-left-color: var(--accent); color: var(--foreground); }
.article-pagination { margin-top: 48px; padding-top: 20px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; border-top: 1px solid var(--border); }
.pagination-link { min-height: 76px; padding: 12px; display: flex; flex-direction: column; justify-content: center; border: 1px solid var(--border); border-radius: 9px; text-decoration: none; }
.pagination-link.next { text-align: right; }
.pagination-link:hover { border-color: var(--border-strong); background: var(--surface-raised); }
.pagination-link span { color: var(--tertiary); font-size: 11px; }
.pagination-link strong { margin-top: 3px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 12px; }
.back-to-top { margin: 22px auto 0; display: flex; }
.floating-top {
  position: fixed;
  z-index: 45;
  right: max(16px, env(safe-area-inset-right, 0px));
  bottom: max(18px, calc(env(safe-area-inset-bottom, 0px) + 12px));
  width: 48px;
  height: 48px;
  padding: 0;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  color: var(--foreground);
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  cursor: pointer;
}
.floating-top:active { transform: scale(.95); }
.floating-top svg { width: 19px; height: 19px; }
.back-link { min-height: 44px; align-items: center; gap: 5px; margin: -4px 0 13px; border-radius: 7px; color: var(--secondary); font-weight: 620; text-decoration: none; }
.back-link svg { width: 18px; height: 18px; }
.reader-error { min-height: 60vh; display: grid; place-content: center; justify-items: center; gap: 7px; color: var(--secondary); }
.reader-error strong { color: var(--foreground); font-size: 18px; }
.reader-error p { margin: 0 0 8px; }
.notebooks-scrim { display: none; border: 0; }

.toast {
  position: fixed;
  z-index: 100;
  left: 50%;
  bottom: max(22px, calc(env(safe-area-inset-bottom, 0px) + 12px));
  max-width: min(calc(100vw - 32px), 420px);
  padding: 10px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  color: var(--foreground);
  background: var(--surface);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translate(-50%, 10px);
  transition: opacity 180ms ease, transform 180ms ease;
  font-size: 13px;
}
.toast.visible { opacity: 1; transform: translate(-50%, 0); }
.noscript-banner { position: fixed; z-index: 90; right: 12px; bottom: 12px; margin: 0; padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px; color: var(--secondary); background: var(--surface); box-shadow: var(--shadow); font-size: 12px; }

.offline-page { min-height: 100dvh; overflow: auto; display: grid; place-items: center; padding: 24px; }
.offline-card { width: min(100%, 440px); padding: 38px 28px; border: 1px solid var(--border); border-radius: 14px; background: var(--surface); box-shadow: 0 14px 44px rgba(28, 32, 40, .1); }
.offline-card img { border-radius: 13px; box-shadow: 0 5px 18px rgba(15, 23, 42, .18); }
.offline-card .eyebrow { margin: 15px 0 4px; color: var(--accent); font-size: 11px; font-weight: 750; letter-spacing: .08em; }
.offline-card h1 { margin: 0; font-size: 27px; letter-spacing: -.03em; }
.offline-card > p:not(.eyebrow) { margin: 10px auto 20px; color: var(--secondary); }

@media (min-width: 1580px) {
  .article-layout { display: grid; grid-template-columns: minmax(0, 720px) 190px; justify-content: space-between; gap: 54px; }
  .article-main { margin: 0; }
  .desktop-outline { display: block; }
  .compact-outline { display: none; }
}

@media (max-width: 1179px) {
  :root { --notes: 318px; }
  .drawer-only { display: grid !important; }
  .notebook-layout { grid-template-columns: var(--notes) minmax(0, 1fr); }
  .notebooks-pane {
    position: fixed;
    z-index: 60;
    inset: var(--topbar) auto 0 0;
    width: min(84vw, 294px);
    visibility: hidden;
    pointer-events: none;
    transform: translateX(-102%);
    box-shadow: var(--shadow);
    transition: transform 190ms ease, visibility 190ms step-end;
  }
  .notebooks-open .notebooks-pane { visibility: visible; pointer-events: auto; transform: translateX(0); transition: transform 190ms ease, visibility 0s; }
  .notebooks-scrim { position: fixed; z-index: 50; inset: var(--topbar) 0 0; background: rgba(12, 16, 24, .38); cursor: default; }
  .notebooks-open .notebooks-scrim { display: block; }
  .notes-pane { grid-column: 1; }
  .reader { grid-column: 2; }
  #article-view { width: min(calc(100% - 42px), 760px); padding-top: 34px; }
}

@media (max-width: 820px), (max-height: 500px) and (max-width: 1024px) {
  .single-pane-only { display: inline-flex !important; }
  body { overflow: hidden; }
  .sync-label { display: none; }
  .notebook-layout { display: block; }
  .notes-pane, .reader { position: absolute; inset: var(--topbar) 0 0; border-right: 0; }
  .notes-pane { display: flex; }
  .reader { display: none; }
  .note-open .notes-pane { display: none; }
  .note-open .reader { display: block; }
  .notes-toolbar { padding: 12px max(14px, env(safe-area-inset-right, 0px)) 12px max(14px, env(safe-area-inset-left, 0px)); }
  .compact-search { min-height: 46px; }
  .compact-search input { font-size: 16px; }
  .compact-search kbd { display: none; }
  .note-row { min-height: 104px; padding: 14px max(16px, env(safe-area-inset-right, 0px)) 14px max(16px, env(safe-area-inset-left, 0px)); }
  .notes-list { padding-bottom: env(safe-area-inset-bottom, 0px); }
  #article-view { width: min(calc(100% - 32px), 700px); padding: 16px 0 max(64px, calc(44px + env(safe-area-inset-bottom, 0px))); }
  .article-header h1 { max-width: none; font-size: 28px; }
  .article-summary { font-size: 14px; }
  .article-body { font-size: 16px; line-height: 1.8; }
  .article-body h2 { margin-top: 36px; font-size: 21px; }
  .article-body .article-table { margin: 16px 0; }
  .article-table figcaption { margin-bottom: 4px; font-size: .78125em; line-height: 1.45; }
  .article-body .table-hint { margin-bottom: 7px; font-size: .75em; line-height: 1.45; }
  .article-table .table-scroll { border-radius: 7px; }
  .article-body .article-table table { min-width: 34em; font-size: .8125em; line-height: 1.45; }
  .article-body .article-table[data-columns="4"] table { min-width: 42em; }
  .article-body .article-table th, .article-body .article-table td {
    min-width: 6.5em;
    padding: 7px 9px;
  }
  .article-body .article-table th { font-weight: 680; }
  .article-body .article-table td:first-child { font-weight: 560; }
  .article-body .article-table th:first-child, .article-body .article-table td:first-child { min-width: 7.5em; }
  .article-body .article-table[data-columns="2"] table { min-width: 0; table-layout: fixed; }
  .article-body .article-table[data-columns="2"] th, .article-body .article-table[data-columns="2"] td { min-width: 0; }
  .article-body .article-table[data-columns="2"] th:first-child, .article-body .article-table[data-columns="2"] td:first-child { width: 34%; }
  .tag, .category-tag { min-height: 44px; }
  .share-button { min-height: 44px; }
  .back-to-top { min-height: 44px; }
}

@media (max-width: 460px) {
  .brand span { font-size: 13px; }
  .article-toolbar { align-items: flex-start; }
  .article-meta { padding-top: 9px; flex-wrap: wrap; }
  .article-header h1 { font-size: 27px; }
  .article-pagination { grid-template-columns: 1fr; }
  .pagination-link.next { text-align: left; }
}

@media (max-height: 500px) and (max-width: 1024px) {
  :root { --topbar: calc(50px + env(safe-area-inset-top, 0px)); }
  #article-view { padding-top: 10px; }
  .back-link { margin-bottom: 7px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}

@media (forced-colors: active) {
  .status-dot, .reading-progress span { forced-color-adjust: none; }
  .note-row.active { outline: 2px solid Highlight; outline-offset: -2px; }
}

/* Reading layout aligned with xuge.munvor.com: one navigation rail and a paper page. */
:root {
  --background: #f4f6fa;
  --surface: #fff;
  --surface-raised: #f4f6fa;
  --foreground: #172235;
  --secondary: #59677b;
  --tertiary: #59677b;
  --border: #dde4ee;
  --border-strong: #cdd8e8;
  --hover: #eef4ff;
  --selected: #e4edff;
  --accent: #245bc9;
  --accent-strong: #194baf;
  --accent-soft: #eef4ff;
  --ring: #245bc9;
  --nav: #101e34;
  --nav-text: #bcc9de;
  --nav-line: #2b3950;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --app-height: 100vh;
  --app-height: 100dvh;
  --topbar: calc(68px + var(--safe-top));
  --notebooks: 292px;
}
/* Home Screen WebKit can subtract the status bar from dvh a second time.
   Use one full-screen coordinate system for the reader and every overlay. */
.standalone-app { --app-height: 100vh; }
.standalone-app .topbar::before {
  content: ""; position: absolute; inset: 0 0 auto; height: var(--safe-top);
  background: var(--nav); pointer-events: none;
}
[data-theme="dark"] {
  --background: #0d1522;
  --surface: #152133;
  --surface-raised: #192a40;
  --foreground: #e8edf6;
  --secondary: #a9b7ca;
  --tertiary: #a9b7ca;
  --border: #304058;
  --border-strong: #415774;
  --hover: #213652;
  --selected: #294464;
  --accent: #92b9ff;
  --accent-strong: #b5d0ff;
  --accent-soft: #213652;
  --ring: #92b9ff;
  --nav: #091322;
}
button, a, input, summary { touch-action: manipulation; }
.topbar { margin-left: var(--notebooks); padding-top: var(--safe-top); padding-inline: 32px; background: var(--surface); }
.topbar-actions { gap: 7px; }
.topbar .brand { font-size: 14px; font-weight: 500; }
.search-open { min-height: 44px; display: flex; align-items: center; gap: 10px; padding: 8px 14px; border: 0; border-radius: 9px; background: var(--background); color: var(--secondary); cursor: pointer; }
.search-open svg { width: 19px; height: 19px; }
.search-open:hover { color: var(--accent); background: var(--accent-soft); }
.floating-top[hidden] { display: none !important; }
.notebook-layout { display: block; }
.notebooks-pane {
  position: fixed; inset: 0 auto 0 0; z-index: 45; width: var(--notebooks);
  padding: 0; border: 0; background: var(--nav); color: var(--nav-text);
  transform: none; visibility: visible; pointer-events: auto; box-shadow: none;
}
.pane-heading { flex-shrink: 0; align-items: flex-start; padding: 28px 24px 22px; border-bottom: 1px solid var(--nav-line); }
.sidebar-brand img { display: block; border: 1px solid #6885ae; border-radius: 10px; margin-bottom: 16px; }
.sidebar-brand a { display: block; color: #f1f5ff; font-size: 23px; font-weight: 600; letter-spacing: .02em; text-decoration: none; }
.sidebar-brand .sidebar-about { color: #a9b7ce; margin: 5px 0 0; font-size: 13px; font-weight: 400; letter-spacing: 0; }
.sidebar-brand .sidebar-about:hover { color: #fff; }
.notebook-nav { flex-shrink: 0; max-height: 31dvh; padding: 10px 16px; border-bottom: 1px solid var(--nav-line); }
.notebook-link { color: var(--nav-text); min-height: 40px; padding: 8px 12px; font-size: 13px; }
.notebook-link small { color: #a9b7ce; }
.notebook-link:hover { background: #1e304b; color: #fff; }
.notebook-link.active { background: #223a5c; color: #fff; }
.notebooks-pane .notes-pane { position: static; display: flex; flex: 1; min-height: 120px; border: 0; background: transparent; }
.notes-toolbar { padding: 14px 16px 10px; border: 0; }
.compact-search { background: #192c46; border-color: #3c5473; color: #e3ebfa; }
.compact-search input { color: #e3ebfa; }
.compact-search input::placeholder, .compact-search svg { color: #b7c8e0; }
.compact-search kbd { display: none; }
.list-heading { padding-top: 0; min-height: 24px; }
.list-heading h1 { color: #e3ebfa; font-size: 14px; letter-spacing: 0; }
.list-heading > span:not(.visually-hidden) { color: #a9b7ce; }
.notes-list { flex: 1; padding: 0 12px 20px; scrollbar-width: thin; scrollbar-color: #51627d transparent; }
.note-row { min-height: 68px; padding: 10px 12px; margin: 2px 0; border: 1px solid transparent; border-radius: 8px; color: var(--nav-text); }
.note-row:hover { background: #1e304b; color: #fff; }
.note-row.active { background: #223a5c; border-color: #44648e; box-shadow: none; color: #fff; }
.note-row h2 { display: block; margin: 4px 0 0; overflow: visible; font-size: 13px; line-height: 1.6; font-weight: 500; letter-spacing: 0; }
.note-row p { display: none; }
.note-row p.search-snippet { display: -webkit-box; color: #c4d4eb; margin-top: 5px; }
.note-row-meta, .note-row-meta > span:first-child, .pinned-label { color: #a9b7ce; font-size: 11px; font-weight: 400; }
.notebooks-footer { flex-shrink: 0; margin: 0; padding: 12px 22px max(12px, env(safe-area-inset-bottom, 0px)); border-color: var(--nav-line); display: flex; align-items: center; justify-content: space-between; gap: 6px; color: #a9b7ce; }
.notebooks-footer p { margin: 0; }
.notebooks-footer a { color: #d5e4ff; min-height: 32px; }
.notebooks-pane .empty-state, .notebooks-pane .load-error { color: #bcc9de; }
.notebooks-pane .empty-state strong, .notebooks-pane .load-error strong { color: #fff; }
.reader { position: relative; inset: auto; display: block; height: 100%; margin-left: var(--notebooks); background: var(--background); }
#article-view { width: min(calc(100% - 80px), 1270px); padding: 33px 0 76px; }
.article-layout { display: block; }
.article-main { width: 100%; margin: 0; padding: 36px 42px 30px; border: 1px solid var(--border); border-radius: 13px; background: var(--surface); box-shadow: 0 7px 26px #0a204905; }
.article-header { padding-bottom: 26px; }
.article-header h1 { max-width: none; margin: 10px 0 16px; font-size: clamp(25px, 2.3vw, 34px); line-height: 1.5; font-weight: 600; letter-spacing: -.02em; }
.article-body { font-family: "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif; font-size: 18px; line-height: 1.95; overflow-wrap: anywhere; }
.article-body p, .article-body ul, .article-body ol { max-width: none; }
.article-body p { margin: 0 0 1.25em; }
.article-body h2, .article-body h3 { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; font-weight: 600; line-height: 1.6; }
.article-body h2 { margin: 2em 0 .9em; padding-top: 20px; border-top: 1px solid var(--border); font-size: 1.2em; }
.article-body h3 { font-size: 1.1em; }
.article-body .lead { font-size: inherit; line-height: inherit; }
.article-body table, .article-table figcaption, .table-hint { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; }
.article-body table { font-size: 15px; }
[data-reader-size="large"] .article-body, [data-reader-size="large"] .article-body .lead { font-size: 20px; line-height: 1.95; }
[data-reader-size="xlarge"] .article-body, [data-reader-size="xlarge"] .article-body .lead { font-size: 22px; line-height: 1.95; }
.desktop-outline { display: none; }
.desktop-outline a { border: 0; padding: 6px 0; font-size: 13px; line-height: 1.6; }
.outline-title { font-size: 13px; font-weight: 500; }
.compact-outline { display: block; }
.search-dialog {
  position: fixed; inset: 0; width: min(640px, calc(100% - 24px));
  height: min(620px, calc(var(--search-viewport-height, 100dvh) - max(12px, var(--safe-top)) - max(12px, var(--safe-bottom))));
  max-height: none; max-width: none; margin: max(12px, var(--safe-top)) auto auto;
  padding: 12px; overflow: hidden; border: 1px solid var(--border); border-radius: 14px;
  color: var(--foreground); background: var(--surface); box-shadow: var(--shadow);
}
.search-dialog[open] { display: flex; flex-direction: column; }
.search-dialog::backdrop { background: #06142680; }
.search-dialog-heading { display: flex; flex: 0 0 auto; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 8px; }
.search-dialog-heading h2 { margin: 0 6px; font-size: 17px; }
.search-dialog .compact-search { flex: 0 0 auto; min-height: 46px; background: var(--background); border-color: var(--border-strong); }
.search-dialog .compact-search input { color: var(--foreground); font-size: 16px; }
.search-dialog .compact-search input::placeholder, .search-dialog .compact-search svg { color: var(--secondary); }
.search-results { display: flex; flex: 1; min-height: 0; }
.search-dialog .notes-pane { position: static; display: flex; flex: 1; min-height: 0; overflow: hidden; border: 0; background: transparent; }
.search-dialog .notes-toolbar { padding: 12px 6px 8px; }
.search-dialog .list-heading h1 { color: var(--foreground); }
.search-dialog .list-heading > span:not(.visually-hidden) { color: var(--secondary); }
.search-dialog .notes-list { padding: 0 0 4px; }
.search-dialog .note-row { color: var(--foreground); }
.search-dialog .note-row:hover { background: var(--hover); }
.search-dialog .note-row.active { color: var(--foreground); background: var(--selected); border-color: var(--border-strong); }
.search-dialog .note-row-meta, .search-dialog .note-row-meta > span:first-child, .search-dialog .pinned-label, .search-dialog .search-snippet { color: var(--secondary); }
.search-dialog .note-row p.search-snippet { color: var(--secondary); }
.search-dialog .empty-state, .search-dialog .load-error { overflow: auto; padding: 16px; }
@media (min-width: 821px) {
  .drawer-only { display: none !important; }
  .notes-pane { grid-column: auto; }
}
@media (min-width: 1440px) {
  .article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 190px; gap: 36px; align-items: start; }
  .desktop-outline { display: block; top: 36px; }
  .compact-outline { display: none; }
}
@media (min-width: 821px) and (max-width: 1100px) {
  :root { --notebooks: 260px; }
  #article-view { width: calc(100% - 44px); padding-top: 24px; }
  .article-main { padding: 28px; }
  .topbar { padding-inline: 22px; }
  .search-open span, .search-open kbd { display: none; }
}
@media (max-width: 820px), (max-height: 500px) and (max-width: 1024px) {
  :root {
    --topbar: calc(62px + var(--safe-top));
    --pagination-height: 53px;
  }
  html, body { height: var(--app-height); overscroll-behavior: none; }
  html { overflow: hidden; }
  body { position: fixed; inset: 0 auto auto 0; width: 100%; }
  .topbar { margin-left: 0; padding-inline: 12px; }
  .topbar .brand span { font-size: 13px; }
  .topbar-start { gap: 5px; }
  .topbar-actions { gap: 2px; }
  .drawer-only { display: grid !important; }
  .search-open { width: 44px; padding: 8px; justify-content: center; background: transparent; }
  .search-open span, .search-open kbd { display: none; }
  .notebooks-pane { z-index: 60; bottom: auto; height: var(--app-height); width: min(320px, 88vw); transform: translateX(-102%); visibility: hidden; pointer-events: none; box-shadow: var(--shadow); }
  .notebooks-open .notebooks-pane { transform: translateX(0); visibility: visible; pointer-events: auto; }
  .notebooks-scrim { inset: 0 0 auto; height: var(--app-height); background: #06142680; }
  .pane-heading { padding: max(16px, var(--safe-top)) 20px 12px; }
  .sidebar-brand img { display: none; }
  .sidebar-brand a { font-size: 21px; }
  #notebooks-close { color: #fff; border: 1px solid #52617a; }
  .notebook-nav { max-height: calc(var(--app-height) * .34); padding: 8px 14px; }
  .notebook-link { min-height: 44px; }
  .notes-toolbar { padding: 12px 14px 8px; }
  .compact-search input { font-size: 16px; }
  .notebooks-pane .notes-pane { display: flex; min-height: 0; }
  .notebooks-pane .notes-list { padding-bottom: max(12px, var(--safe-bottom)); }
  .notebooks-footer { display: none; }
  .reader, .note-open .reader { position: relative; inset: auto; margin-left: 0; display: block; }
  #article-view { width: calc(100% - 20px); padding: 12px 0 calc(var(--pagination-height) + 16px); }
  .article-main { padding: 24px 19px; border-radius: 10px; }
  .back-link { display: none !important; }
  .article-header h1 { font-size: 25px; line-height: 1.55; }
  .article-summary { font-size: 13px; }
  .article-body { font-size: 17px; line-height: 1.95; }
  [data-reader-size="large"] .article-body, [data-reader-size="large"] .article-body .lead { font-size: 19px; }
  [data-reader-size="xlarge"] .article-body, [data-reader-size="xlarge"] .article-body .lead { font-size: 21px; }
  /* Keep navigation at the two sides. The center stays free for the Home gesture
     instead of reserving another full-width blank row below the buttons. */
  .article-pagination { position: fixed; top: calc(var(--app-height) - var(--pagination-height)); bottom: auto; left: 0; right: 0; z-index: 35; grid-template-columns: repeat(2, minmax(0, 1fr)); background: var(--surface); margin: 0; padding: 4px max(14px, env(safe-area-inset-right, 0px)) 4px max(14px, env(safe-area-inset-left, 0px)); gap: 12px; }
  .pagination-link { width: fit-content; min-width: 88px; max-width: 100%; min-height: 44px; padding: 0 10px; border: 0; flex-direction: row; align-items: center; gap: 8px; justify-content: flex-start; justify-self: start; }
  .pagination-link.next { text-align: right; justify-content: flex-end; justify-self: end; }
  .pagination-link span { font-size: 13px; }
  .pagination-link.previous::before { content: "←"; }
  .pagination-link.next::after { content: "→"; }
  .pagination-link strong { display: none; }
  .floating-top { top: calc(var(--app-height) - var(--pagination-height) - 60px); bottom: auto; }
}

/* Compact, responsive reading styles for the interactive course. */
#article-view:has(.lesson-visual){width:min(100%,960px);padding:0 0 32px;container:lesson / inline-size}
.reader:has(.lesson-visual){background:var(--background)}
.visual-back-link{margin:10px 16px 0}
.lesson-visual{--text:16px;--ink:#203246;--muted:#56677a;--blue:#28599f;--teal:#156e5b;--paper:#f6f7f9;--card:#fff;--subtle:#f7f9fb;--line:#dce4ec;--blue-bg:#eff4fb;--teal-bg:#edf7f3;--amber-bg:#fff6e7;--amber-ink:#956523;margin:0;color:var(--ink);font:var(--text)/1.7 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;overflow-wrap:anywhere}
[data-theme="dark"] .lesson-visual{--ink:#e6edf5;--muted:#b3c0cf;--blue:#a0c1f0;--teal:#8cd9be;--paper:#20201f;--card:#252a31;--subtle:#292f38;--line:#3d4652;--blue-bg:#28394b;--teal-bg:#273e36;--amber-bg:#413723;--amber-ink:#ddb679}
[data-reader-size="large"] .lesson-visual{--text:18px}
[data-reader-size="xlarge"] .lesson-visual{--text:20px}
.lesson-visual *{box-sizing:border-box}
.lesson-visual :is(button,input,summary,a){touch-action:manipulation}
.lesson-visual :focus-visible{outline:2px solid var(--blue);outline-offset:3px}
.lesson-visual :is(h1,h2,h3,p){margin:0}
.lesson-visual h1{font-size:1.875em;line-height:1.35;letter-spacing:-.025em;text-wrap:balance}
.lesson-visual h2{font-size:1.3125em;line-height:1.5;letter-spacing:-.02em}
.lesson-visual h3{margin-bottom:5px;font-size:1.03125em;line-height:1.55}
.lesson-visual :is(b,strong){font-weight:650}
.lesson-visual p+p{margin-top:8px}
.lesson-visual a{color:var(--blue)}
.lesson-visual .wrap{max-width:920px;margin:0 auto}
.lesson-visual .hero{padding:30px 24px 8px}
.lesson-visual .eyebrow{margin-bottom:10px;color:var(--blue);font-size:.75em;font-weight:650;letter-spacing:.06em}
.lesson-visual .hero p{margin-top:12px;color:var(--muted)}
.lesson-visual .hero .hero-deck{margin-top:7px;color:var(--ink);font-size:1em;font-weight:500}
.lesson-visual .hero>p:not(.fine):not(.hero-deck){max-width:66ch;font-size:.9375em}
.lesson-visual nav{display:flex;flex-wrap:wrap;gap:7px;margin-top:16px}
.lesson-visual nav a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:6px 12px;border:1px solid var(--line);border-radius:7px;background:var(--card);font-size:.8125em;text-decoration:none}
.lesson-visual nav a:hover{background:var(--blue-bg);border-color:var(--blue)}
.lesson-visual .sheet{margin:16px 20px 0;padding:22px 24px 16px;border:1px solid var(--line);border-radius:12px;background:var(--card);scroll-margin-top:16px}
.lesson-visual .sheet-head{display:grid;grid-template-columns:32px minmax(0,1fr);gap:8px 12px;align-items:start;margin-bottom:18px}
.lesson-visual .sheet-head>div:last-child{display:contents}
.lesson-visual .number{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:8px;background:var(--blue-bg);color:var(--blue);font-size:.875em;font-weight:650;font-variant-numeric:tabular-nums}
.lesson-visual .subtitle{grid-column:1/-1;color:var(--muted);font-size:.875em;line-height:1.7}
.lesson-visual .grid{display:grid;gap:12px;margin:16px 0}
.lesson-visual .c3{grid-template-columns:repeat(3,minmax(0,1fr))}
.lesson-visual .c2{grid-template-columns:repeat(2,minmax(0,1fr))}
.lesson-visual .box{min-width:0;padding:14px;border:1px solid var(--line);border-radius:8px;background:var(--subtle)}
.lesson-visual .box p{font-size:.9375em;line-height:1.7}
.lesson-visual .blue{background:var(--blue-bg)}
.lesson-visual .teal{background:var(--teal-bg)}
.lesson-visual .amber{background:var(--amber-bg)}
.lesson-visual .note{margin-top:14px;padding:11px 13px;border-left:3px solid var(--blue);border-radius:0 7px 7px 0;background:var(--subtle);font-size:.875em;line-height:1.75}
.lesson-visual .note.blue{background:var(--blue-bg)}
.lesson-visual .note.amber{border-left-color:var(--amber-ink);background:var(--amber-bg)}
.lesson-visual .fine{margin-top:12px;color:var(--muted);font-size:.8125em;line-height:1.7}
.lesson-visual .flow{display:flex;align-items:stretch;gap:8px;margin:12px 0}
.lesson-visual .flow>.box{flex:1;padding:12px}
.lesson-visual .flow h3{font-size:1em}
.lesson-visual .flow p{font-size:.875em}
.lesson-visual .arrow{align-self:center;flex:none;color:var(--muted);font-size:22px;line-height:1}
.lesson-visual .lane{margin-top:12px;padding:12px;border:1px solid var(--line);border-radius:9px;background:var(--subtle)}
.lesson-visual .lane-label{color:var(--blue);font-size:.8125em;font-weight:650}
.lesson-visual .lane .flow{margin:10px 0 0}
.lesson-visual .lane .box{background:var(--card)}
.lesson-visual .route{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.lesson-visual .route-step{display:grid;grid-template-columns:24px minmax(0,1fr);align-content:start;gap:4px 8px;padding:12px;border:1px solid var(--line);border-radius:8px}
.lesson-visual .route-step>span{color:var(--blue);font-size:.8125em;font-weight:650;line-height:1.9;font-variant-numeric:tabular-nums}
.lesson-visual .route-step h3{margin:0;font-size:.9375em}
.lesson-visual .route-step p{grid-column:2;font-size:.8125em;color:var(--muted);line-height:1.65}
.lesson-visual .tag{display:inline-block;min-height:0;margin:0 0 7px;padding:0;border:0;border-radius:0;color:var(--muted);background:none;font-size:.8125em;font-weight:normal}
.lesson-visual .tag::before{content:none}
.lesson-visual .decision{margin:16px 0;padding:14px;border:1px dashed var(--line);border-radius:8px}
.lesson-visual .decision-title{text-align:center;font-size:.9375em;font-weight:650}
.lesson-visual .decision .flow{margin-bottom:0}
.lesson-visual .subhead{margin:18px 0 8px}
.lesson-visual .table-wrap{max-width:100%;overflow-x:auto;margin-top:16px;border:1px solid var(--line);border-radius:8px}
.lesson-visual table{width:100%;border-collapse:collapse;font-size:.875em;line-height:1.7}
.lesson-visual th,.lesson-visual td{padding:11px 12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
.lesson-visual th{background:var(--blue-bg);font-weight:650}
.lesson-visual td:first-child{width:24%;font-weight:600}
.lesson-visual tr:last-child td{border-bottom:0}
.lesson-visual .visually-hidden{margin:0}
.lesson-visual .price-layout{grid-template-columns:1.2fr 1fr;gap:20px}
.lesson-visual .bars{margin-top:16px}
.lesson-visual .bar-row{display:grid;grid-template-columns:91px minmax(0,1fr) 58px;align-items:center;gap:8px;margin:14px 0;font-size:.8125em;font-variant-numeric:tabular-nums}
.lesson-visual .bar-row b{text-align:right}
.lesson-visual .track{height:16px;border-radius:4px;background:var(--subtle)}
.lesson-visual .bar{height:100%;border-radius:4px;background:var(--blue)}
.lesson-visual .bar-row:nth-child(n+4) .bar{background:var(--amber-ink)}
.lesson-visual .quote-bar-1{width:30%}
.lesson-visual .quote-bar-2{width:30.6%}
.lesson-visual .quote-bar-3{width:31%}
.lesson-visual .quote-bar-4{width:50%}
.lesson-visual .quote-bar-5{width:100%}
.lesson-visual .equation{margin:12px 0;font-size:1.375em;line-height:1.6;font-variant-numeric:tabular-nums}
.lesson-visual .equation strong{color:var(--teal);font-size:1em}
.lesson-visual .scenario{margin:16px 0;padding:14px;border:1px solid var(--line);border-radius:8px}
.lesson-visual .scenario-head{display:flex;justify-content:space-between;align-items:center;gap:12px}
.lesson-visual .scenario-head h3{margin-bottom:0}
.lesson-visual .toggle{display:flex;flex-shrink:0;gap:8px}
.lesson-visual button{min-height:44px;padding:6px 12px;border:1px solid var(--line);border-radius:7px;color:var(--ink);background:var(--card);font:inherit;font-size:.875em;cursor:pointer;transition:background 160ms}
.lesson-visual button[aria-pressed="true"]{color:var(--card);background:var(--blue);border-color:var(--blue)}
.lesson-visual #stock-demo{margin-top:12px;padding:11px 12px;border-radius:7px;background:var(--teal-bg);font-size:.875em;line-height:1.75}
.lesson-visual #stock-demo.stock-unavailable{background:var(--amber-bg)}
.lesson-visual .risk-row{display:grid;grid-template-columns:28px minmax(0,1fr) 24px minmax(0,.9fr);align-items:center;gap:12px;padding:16px 0;border-bottom:1px solid var(--line)}
.lesson-visual .risk-no{color:var(--blue);font-size:.9375em;font-weight:650}
.lesson-visual .risk-row p{font-size:.875em}
.lesson-visual .risk-impact{padding:11px 12px;border-radius:7px;background:var(--amber-bg)}
.lesson-visual .sample-flow{padding:14px;border:1px solid var(--line);border-radius:8px;background:var(--subtle)}
.lesson-visual .sample-suppliers{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;text-align:center}
.lesson-visual .sample-suppliers .box{padding:10px 8px;background:var(--card)}
.lesson-visual .sample-suppliers h3{font-size:.875em}
.lesson-visual .sample-suppliers p{color:var(--muted);font-size:.75em}
.lesson-visual .down-arrow{padding:8px;color:var(--blue);text-align:center;font-size:.8125em;font-weight:600}
.lesson-visual .sample-center{padding:12px;border:1px solid var(--line);border-radius:8px;background:var(--blue-bg);text-align:center}
.lesson-visual .sample-checks{display:flex;flex-wrap:wrap;justify-content:center;gap:7px;margin-top:8px}
.lesson-visual .sample-checks span{padding:6px 9px;border-radius:5px;background:var(--card);font-size:.8125em}
.lesson-visual .sample-result{padding:11px 12px;border:1px solid var(--line);border-radius:8px;background:var(--teal-bg);text-align:center;font-size:.9375em;font-weight:600}
.lesson-visual .checklist{margin-top:16px;padding:14px;border:1px solid var(--line);border-radius:8px}
.lesson-visual .checklist label{display:flex;align-items:center;gap:10px;min-height:44px;padding-block:4px;font-size:.9375em;cursor:pointer}
.lesson-visual .checklist input{flex-shrink:0;width:18px;height:18px;accent-color:var(--teal)}
.lesson-visual .checklist p{margin-top:8px;color:var(--teal);font-size:.875em}
.lesson-visual details{margin-top:16px;padding-top:4px;border-top:1px solid var(--line)}
.lesson-visual summary{min-height:44px;padding:10px 0;color:var(--blue);font-size:.875em;cursor:pointer}
.lesson-visual .source-block{padding:14px 0;border-bottom:1px dashed var(--line)}
.lesson-visual .source-block p{margin-top:7px;font-size:1em;line-height:1.85;white-space:pre-wrap}
.lesson-visual .source-block b{color:var(--muted);font-size:.8125em;font-weight:600}
.lesson-visual .footer{display:flex;justify-content:space-between;align-items:start;gap:12px;margin-top:12px;padding-top:10px;border-top:1px solid var(--line);color:var(--muted);font-size:.75em;line-height:1.6}
.lesson-visual .footer>span:last-child{white-space:nowrap}
.lesson-visual .end{padding:22px 24px 30px;color:var(--muted);font-size:.75em;line-height:1.75}
@container lesson (max-width:720px){
.lesson-visual .c3,.lesson-visual .price-layout{grid-template-columns:1fr}
.lesson-visual .flow{flex-direction:column;gap:3px}
.lesson-visual .flow>.arrow{transform:rotate(90deg);font-size:18px}
.lesson-visual .flow>.box{padding:10px 12px}
.lesson-visual .scenario-head{flex-direction:column;align-items:flex-start}
.lesson-visual .risk-row{grid-template-columns:24px minmax(0,1fr);gap:8px 10px;padding:14px 0}
.lesson-visual .risk-row>.arrow{display:none}
.lesson-visual .risk-impact{grid-column:2}
}
@container lesson (max-width:520px){
.lesson-visual h1{font-size:1.5em}
.lesson-visual h2{font-size:1.1875em}
.lesson-visual h3{font-size:1em}
.lesson-visual .hero{padding:18px 16px 4px}
.lesson-visual .hero p{margin-top:10px}
.lesson-visual .hero .hero-deck{margin-top:6px;font-size:.875em}
.lesson-visual .hero>p:not(.fine):not(.hero-deck){font-size:.875em}
.lesson-visual .hero .fine{font-size:.75em}
.lesson-visual nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;margin-top:12px}
.lesson-visual nav a{padding:5px 7px;border-radius:6px}
.lesson-visual .sheet{margin:12px 12px 0;padding:16px 14px 12px;border-radius:10px}
.lesson-visual .sheet-head{grid-template-columns:28px minmax(0,1fr);gap:8px 10px;margin-bottom:14px}
.lesson-visual .number{width:28px;height:28px;border-radius:7px;font-size:.8125em}
.lesson-visual .grid{gap:10px;margin:14px 0}
.lesson-visual .c2{grid-template-columns:1fr}
.lesson-visual .box{padding:12px}
.lesson-visual .route{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.lesson-visual .route-step{grid-template-columns:20px minmax(0,1fr);gap:4px 6px;padding:10px}
.lesson-visual .route-step h3{font-size:.875em}
.lesson-visual .route-step p{grid-column:1/-1}
.lesson-visual .lane,.lesson-visual .decision,.lesson-visual .scenario{padding:10px}
.lesson-visual .lane .flow{margin-top:8px}
.lesson-visual table{min-width:480px}
.lesson-visual th,.lesson-visual td{padding:9px 10px}
.lesson-visual .bar-row{grid-template-columns:84px minmax(0,1fr) 54px;gap:7px}
.lesson-visual .equation{font-size:1.25em}
.lesson-visual .sample-flow{padding:10px}
.lesson-visual .sample-suppliers .box{padding:9px 6px}
.lesson-visual .sample-suppliers h3{font-size:.8125em}
.lesson-visual .sample-suppliers p{font-size:.75em}
.lesson-visual .sample-center{padding:10px}
.lesson-visual .sample-checks{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}
.lesson-visual .sample-checks span{padding:6px;font-size:.75em}
.lesson-visual .end{padding:20px 16px 26px}
}
/* Shared course edition: diagrams, comparisons and verbatim source timelines. */
.lesson-visual .course-edition .hero{padding-bottom:0}
.lesson-visual .lesson-directory{margin-top:10px;padding-top:0;border:0}
.lesson-visual .lesson-directory summary{font-size:.8125em;color:var(--muted)}
.lesson-visual .lesson-directory nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));margin:6px 0 0}
.lesson-visual .lesson-directory nav a{justify-content:flex-start;text-align:left;line-height:1.55}
.lesson-visual .course-graph{margin:0 0 18px;min-width:0}
.lesson-visual .course-graph figcaption{padding:0 0 4px;color:var(--blue);font-size:.75em;font-weight:600;letter-spacing:.05em}
.lesson-visual .course-graph figcaption>span{display:block;margin-bottom:3px;color:var(--blue);font-size:.8em;font-weight:500;letter-spacing:.05em}
.lesson-visual .logic-nodes{list-style:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0 0;padding:0;position:relative}
.lesson-visual .logic-nodes:before{content:"";position:absolute;left:50%;top:-18px;height:18px;border-left:1px solid var(--line)}
.lesson-visual .logic-nodes>li{position:relative;display:flex;align-items:flex-start;gap:10px;padding:13px;border:1px solid var(--line);border-radius:8px;background:var(--subtle);min-width:0}
.lesson-visual .logic-index{flex:none;display:grid;place-items:center;width:24px;height:24px;background:var(--blue-bg);color:var(--blue);border-radius:6px;font-size:.75em;font-weight:650}
.lesson-visual .logic-nodes h3{font-size:.9375em;margin-bottom:4px}
.lesson-visual .logic-nodes p{font-size:.875em;line-height:1.75;color:var(--muted)}
.lesson-visual .graph-flow .logic-nodes{grid-template-columns:1fr;gap:10px}
.lesson-visual .graph-flow .logic-nodes:before{left:25px}
.lesson-visual .graph-flow .logic-nodes>li:not(:last-child):after{content:"↓";position:absolute;left:19px;bottom:-15px;color:var(--blue);font-size:12px;line-height:16px;z-index:1}
.lesson-visual .graph-tree .logic-nodes>li{border-top:3px solid var(--blue)}
.lesson-visual .graph-compare .logic-nodes>li:nth-child(even){background:var(--teal-bg)}
.lesson-visual .graph-formula .logic-nodes>li:last-child{background:var(--teal-bg)}
.lesson-visual .graph-formula .logic-nodes p{font-variant-numeric:tabular-nums;color:var(--ink)}
.lesson-visual .graph-funnel .logic-nodes{grid-template-columns:1fr;gap:10px}
.lesson-visual .graph-funnel .logic-nodes>li{margin-inline:0;background:var(--blue-bg)}
.lesson-visual .graph-funnel .logic-nodes>li:nth-child(2){margin-inline:12px}
.lesson-visual .graph-funnel .logic-nodes>li:nth-child(3){margin-inline:24px;background:var(--teal-bg)}
.lesson-visual .graph-funnel .logic-nodes>li:nth-child(4){margin-inline:36px;background:var(--teal-bg)}
.lesson-visual .course-explanation{font-size:1em;line-height:1.8}
.lesson-visual .course-explanation>h3{margin:20px 0 10px;padding-left:10px;border-left:3px solid var(--blue);font-size:1em}
.lesson-visual .concept-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:12px 0}
.lesson-visual .concept-card{min-width:0;padding:12px 14px;border:1px solid var(--line);border-radius:8px;background:var(--subtle)}
.lesson-visual .concept-card:only-child{grid-column:1/-1}
.lesson-visual .concept-card p{font-size:.9375em;line-height:1.85}
.lesson-visual .course-comparison{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:14px 0}
.lesson-visual .compare-card{min-width:0;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.lesson-visual .compare-card>h3{margin:0;padding:10px 12px;background:var(--blue-bg);font-size:.9375em;line-height:1.65}
.lesson-visual .compare-card dl{margin:0;padding:2px 12px 10px}
.lesson-visual .compare-card dl>div{padding-top:8px}
.lesson-visual .compare-card dt{margin-bottom:2px;color:var(--muted);font-size:.75em;font-weight:600}
.lesson-visual .compare-card dd{margin:0;font-size:.9375em;line-height:1.8}
.lesson-visual .course-steps{list-style:none;counter-reset:step;display:grid;gap:10px;margin:14px 0;padding:0}
.lesson-visual .course-steps>li{counter-increment:step;position:relative;padding:12px 14px 12px 47px;background:var(--subtle);border:1px solid var(--line);border-radius:8px;font-size:.9375em}
.lesson-visual .course-steps>li:before{content:counter(step,decimal-leading-zero);position:absolute;left:12px;top:12px;color:var(--blue);font-size:.875em;font-weight:650}
.lesson-visual .course-steps>li:not(:last-child):after{content:"↓";position:absolute;left:18px;bottom:-15px;color:var(--blue);font-size:12px;line-height:16px;z-index:1}
.lesson-visual .course-points{list-style:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:14px 0;padding:0}
.lesson-visual .course-points>li{position:relative;min-width:0;padding:12px 12px 12px 27px;border:1px solid var(--line);border-radius:8px;font-size:.9375em;background:var(--subtle)}
.lesson-visual .course-points>li:before{content:"";position:absolute;width:5px;height:5px;border-radius:50%;left:12px;top:23px;background:var(--blue)}
.lesson-visual .course-explanation :is(ul,ol) :is(ul,ol){padding-left:20px;margin:8px 0}
.lesson-visual .course-explanation :is(pre,code){font-size:.875em;overflow-wrap:anywhere;white-space:pre-wrap}
.lesson-visual .course-explanation img{max-width:100%;height:auto;border-radius:8px}
.lesson-visual .course-explanation .note{margin:12px 0;font-size:.9375em}
.lesson-visual .course-edition .footer a{display:inline-flex;align-items:center;min-height:44px;text-underline-offset:3px}
.lesson-visual .source-meta{margin:12px 0;padding:12px;background:var(--subtle);border-radius:8px;font-size:.75em;color:var(--muted)}
.lesson-visual .source-chapter{margin:0;padding:0;border-bottom:1px solid var(--line);border-top:0}
.lesson-visual .source-chapter summary{padding:12px 0;font-size:.875em;line-height:1.75}
.lesson-visual .source-chapter summary>span:last-child{margin-left:12px;color:var(--muted);font-size:.875em}
.lesson-visual .source-chapter[open]>summary{font-weight:600}
.lesson-visual .source-chapter .source-block:last-child{border-bottom:0}
.lesson-visual .course-source-sheet .number{font-size:.6875em}
@container lesson (max-width:720px){
 .lesson-visual :is(.concept-grid,.course-comparison,.course-points){grid-template-columns:1fr}
 .lesson-visual .lesson-directory nav{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@container lesson (max-width:520px){
 .lesson-visual .logic-nodes{grid-template-columns:1fr;gap:8px;margin-top:12px}
 .lesson-visual .logic-nodes:before{height:12px;top:-12px}
 .lesson-visual .logic-nodes>li{padding:11px;gap:8px}
 .lesson-visual .logic-nodes h3{font-size:.9375em}
 .lesson-visual .course-graph figcaption{padding:0 0 2px}
 .lesson-visual .concept-card{padding:10px 12px}
 .lesson-visual .concept-grid{gap:8px}
 .lesson-visual .graph-funnel .logic-nodes>li:nth-child(2){margin-inline:6px}
 .lesson-visual .graph-funnel .logic-nodes>li:nth-child(3){margin-inline:12px}
 .lesson-visual .graph-funnel .logic-nodes>li:nth-child(4){margin-inline:18px}
 .lesson-visual .source-chapter summary>span:last-child{margin-left:8px}
}
.lesson-63-mobile{display:none}
@media (max-width:820px), (max-height:500px) and (max-width:1024px){
 .lesson-63-desktop{display:none}
 .lesson-63-mobile{display:block;max-width:430px;margin:0 auto;padding:8px 8px 24px}
 .lesson-visual .lesson-image-hint{margin:0 8px 10px;color:var(--muted);font-size:12px;line-height:1.7}
 .lesson-visual .lesson-image-page{margin:0 0 12px;border:1px solid var(--line);border-radius:10px;background:var(--card);overflow:hidden}
 .lesson-image-page a{display:block;cursor:zoom-in}
 .lesson-image-page img{display:block;width:100%;height:auto}
 .lesson-image-page .image-dark{display:none}
 [data-theme="dark"] .lesson-image-page .image-light{display:none}
 [data-theme="dark"] .lesson-image-page .image-dark{display:block}
 body:has(.lesson-63-mobile) #font-size-toggle{display:none}
}
body:has(.lesson-visual) #floating-top[hidden]{display:none!important}
@media(prefers-reduced-motion:reduce){.lesson-visual *{scroll-behavior:auto!important;transition:none!important}}
@media print{.lesson-visual{--text:12px;color:#203246;background:white}.lesson-visual nav,.visual-back-link{display:none!important}.lesson-visual .sheet{break-inside:avoid;margin:12px 0;padding:16px;box-shadow:none}}


/* Personal reading tools; the rest of the notebook layout stays unchanged. */
.annotation-toolbar {
  position: fixed;
  z-index: 65;
  display: flex;
  align-items: center;
  gap: 6px;
  max-width: calc(100vw - 16px);
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.annotation-toolbar button, .annotation-dialog button {
  min-height: 44px;
  padding: 8px 15px;
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--foreground);
  background: var(--surface-raised);
  font: inherit;
  font-size: 14px;
  white-space: nowrap;
  cursor: pointer;
}
.annotation-toolbar button:hover, .annotation-dialog button:hover { filter: brightness(.96); }
.annotation-toolbar .annotation-highlight-action { background: #fff0a8; color: #263044; border-color: #dbc779; }
.annotation-toolbar .annotation-note-action { background: var(--accent-soft); color: var(--accent); border-color: transparent; }
.annotation-toolbar .annotation-delete-text-action, .annotation-dialog .annotation-delete { color: #b42626; }
[data-theme="dark"] :is(.annotation-delete-text-action, .annotation-dialog .annotation-delete) { color: #ffa5a5; }
#article-content mark.reader-highlight {
  padding: 0;
  border-radius: 2px;
  color: #232b38;
  background: #fff0a8;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
  cursor: pointer;
}
#article-content mark.reader-highlight.has-note {
  text-decoration: underline dotted #977000;
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
}
#article-content mark.reader-highlight:focus-visible { outline: 2px solid var(--ring); outline-offset: 3px; }
.reader-deleted-text { display: none !important; }
.text-deletion-recovery { display: flex; flex-shrink: 0; }
#text-deletion-undo { color: var(--accent); }
.annotation-dialog {
  width: min(620px, calc(100vw - 32px));
  max-height: calc(100dvh - 40px);
  padding: 0;
  overflow: auto;
  overscroll-behavior: contain;
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--foreground);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.annotation-dialog::backdrop { background: rgba(17, 24, 39, .45); }
.annotation-dialog .dialog-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 14px 20px; border-bottom: 1px solid var(--border); }
.annotation-dialog .dialog-head h2 { margin: 0; font-size: 17px; }
.annotation-content { padding: 20px 24px 24px; }
.annotation-quote {
  max-height: 135px;
  overflow: auto;
  margin: 0 0 20px;
  padding: 13px 15px;
  border-left: 3px solid #d5aa32;
  border-radius: 0 6px 6px 0;
  background: var(--background);
  font-size: 15px;
  line-height: 1.8;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.annotation-content label { display: block; margin-bottom: 9px; font-size: 14px; font-weight: 600; }
.annotation-content textarea {
  display: block;
  width: 100%;
  min-height: 140px;
  resize: vertical;
  padding: 12px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  color: var(--foreground);
  background: var(--surface);
  font: inherit;
  font-size: 16px;
  line-height: 1.7;
}
.annotation-chooser { margin-bottom: 18px; }
.annotation-content select { width: 100%; min-height: 44px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 7px; color: var(--foreground); background: var(--surface); font: inherit; }
.annotation-storage-note { margin: 12px 0 20px; color: var(--secondary); font-size: 13px; }
.annotation-dialog-actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 9px; }
.annotation-dialog-actions .annotation-delete { margin-right: auto; }
.annotation-dialog-actions .annotation-save { border-color: var(--accent); color: var(--surface); background: var(--accent); }
.annotation-error { margin: 0 0 16px; color: #b42626; font-size: 14px; }
[data-theme="dark"] .annotation-error { color: #ffa5a5; }
.annotation-toast {
  position: fixed;
  bottom: calc(92px + env(safe-area-inset-bottom, 0px));
  left: 50%;
  transform: translateX(-50%);
  z-index: 90;
  width: max-content;
  max-width: calc(100vw - 28px);
  padding: 11px 16px;
  border: 1px solid #405472;
  border-radius: 9px;
  color: #fff;
  background: #263044;
  font-size: 14px;
  line-height: 1.6;
  text-align: center;
}
@media (max-width: 820px), (max-height: 500px) and (max-width: 1024px) {
  .annotation-toolbar { top: auto !important; bottom: calc(16px + env(safe-area-inset-bottom, 0px)); left: 50% !important; transform: translateX(-50%); }
  body:has(.annotation-toolbar:not([hidden])) #floating-top { visibility: hidden; }
  .annotation-dialog { max-height: calc(100dvh - 24px); }
  .annotation-content { padding: 18px 16px; }
  .annotation-quote { max-height: 110px; font-size: 14px; }
  .annotation-content textarea { min-height: 125px; }
  .annotation-dialog-actions button { padding: 8px 12px; }
  body.has-text-deletions .topbar-start { min-width: 0; }
  body.has-text-deletions .brand { min-width: 0; }
  body.has-text-deletions .brand span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  body.has-text-deletions .topbar-actions { flex-shrink: 0; }
}
@media print {
  .annotation-toolbar, .annotation-dialog, .annotation-toast, .text-deletion-recovery { display: none !important; }
  #article-content mark.reader-highlight { background: #fff0a8 !important; print-color-adjust: exact; -webkit-print-color-adjust: exact; }
}

.annotation-toolbar .annotation-ai-action {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--surface);
}
.selection-ai-dialog { width: min(680px, calc(100vw - 24px)); max-height: 85dvh; }
.selection-ai-dialog .dialog-head { position: sticky; top: 0; background: var(--surface); z-index: 1; }
.selection-ai-content { padding: 18px 24px 24px; }
.selection-ai-caption { font-size: 13px; color: var(--secondary); line-height: 1.7; margin: 0 0 14px; }
.selection-ai-result { font-size: 16px; line-height: 1.9; overflow-wrap: anywhere; }
.selection-ai-result h3 { font-size: 17px; line-height: 1.6; margin: 22px 0 8px; }
.selection-ai-result p { margin: 8px 0; white-space: pre-wrap; }
.selection-ai-result ul { margin: 8px 0; padding-left: 23px; }
.selection-ai-result li { margin: 6px 0; }
.selection-ai-actions { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 9px; margin-top: 18px; }
#selection-ai-status { font-size: 14px; color: var(--secondary); line-height: 1.7; }
#selection-ai-error { color: #b42626; font-size: 14px; line-height: 1.7; }
[data-theme="dark"] #selection-ai-error { color: #ffa5a5; }
.selection-ai-dialog [hidden] { display: none !important; }
@media (max-width: 820px) {
  .annotation-toolbar button { padding: 8px 10px; }
  .selection-ai-content { padding: 16px; }
  .selection-ai-result { font-size: 15px; }
}
@media (max-width: 760px) {
  .selection-ai-dialog { left: 50vw; top: 50dvh; right: auto; bottom: auto; margin: 0; transform: translate(-50%, -50%); }
}