/* Miru — quiet Markdown reader
   Warm parchment, single ink-blue accent, serif-led reading. */

@font-face {
  font-family: 'Commit Mono';
  src: url('vendor/fonts/CommitMono-400-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Commit Mono';
  src: url('vendor/fonts/CommitMono-400-Italic.woff2') format('woff2');
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}

/* --------------------------------------------------------------------------
   Tokens
   -------------------------------------------------------------------------- */
:root {
  --paper:           #f5f4ed;
  --paper-raised:    #faf9f5;
  --ink:             #171714;
  --ink-soft:        #55534d;
  --muted:           #77746d;
  --accent:          #1b365d;
  --accent-soft:     #e8edf3;
  --line:            #dedbd0;
  --code-text:       #3a332d;
  --code-surface:    #eae5e1;
  --code-edge:       rgba(25, 20, 12, 0.14);
  --code-shadow-inset: rgba(25, 20, 12, 0.04);
  --code-shadow:     rgba(60, 50, 42, 0.10);
  --code-action-border: rgba(25, 20, 12, 0.14);
  --code-action-bg:     rgba(255, 255, 255, 0.35);
  --code-action-hover-bg: rgba(255, 255, 255, 0.55);
  --code-action-color:  #7d7166;
  --shadow:          rgba(0, 0, 0, 0.05);

  --hljs-comment:    #8d7f73;
  --hljs-keyword:    #8a4b2a;
  --hljs-string:     #58683f;
  --hljs-number:     #71558b;
  --hljs-title:      #4a5878;
  --hljs-type:       #7a6220;
  --hljs-attr:       #5e5a70;
  --hljs-meta:       #866f5e;

  --annot-hl-bg:     rgba(255, 214, 102, 0.42);
  --annot-rail-width: 220px;
  --annot-rail-gap:   24px;

  --font-serif: Charter, Georgia, "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", "Times New Roman", serif;
  --font-sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono:  "Commit Mono", "SF Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;

  --topbar-height: 60px;
  --toc-width:     230px;
  --article-max:   860px;
  --radius:        8px;
}

[data-theme="dark"] {
  --paper:        #141413;
  --paper-raised: #1e1e1c;
  --ink:          #e8e6dc;
  --ink-soft:     #b8b6ac;
  --muted:        #8b897f;
  --accent:       #84a4c4;
  --accent-soft:  #283345;
  --line:         #2f2e29;
  --code-text:    #e9e4dc;
  --code-surface: #26231f;
  --code-edge:    rgba(240, 240, 240, 0.10);
  --code-shadow-inset: rgba(240, 240, 240, 0.04);
  --code-shadow:  rgba(0, 0, 0, 0.28);
  --code-action-border: rgba(240, 240, 240, 0.18);
  --code-action-bg:     rgba(255, 255, 255, 0.08);
  --code-action-hover-bg: rgba(255, 255, 255, 0.14);
  --code-action-color:  #c8c0b4;
  --shadow:       rgba(0, 0, 0, 0.18);

  --hljs-comment: #857c70;
  --hljs-keyword: #d89b72;
  --hljs-string:  #adba8b;
  --hljs-number:  #bca1d6;
  --hljs-title:   #9fb4d8;
  --hljs-type:    #d3bc7e;
  --hljs-attr:    #b9b3cc;
  --hljs-meta:    #a78f79;

  --annot-hl-bg:  rgba(255, 214, 102, 0.20);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --paper:        #141413;
    --paper-raised: #1e1e1c;
    --ink:          #e8e6dc;
    --ink-soft:     #b8b6ac;
    --muted:        #8b897f;
    --accent:       #84a4c4;
    --accent-soft:  #283345;
    --line:         #2f2e29;
    --code-text:    #e9e4dc;
    --code-surface: #26231f;
    --code-edge:    rgba(240, 240, 240, 0.10);
    --code-shadow-inset: rgba(240, 240, 240, 0.04);
    --code-shadow:  rgba(0, 0, 0, 0.28);
    --code-action-border: rgba(240, 240, 240, 0.18);
    --code-action-bg:     rgba(255, 255, 255, 0.08);
    --code-action-hover-bg: rgba(255, 255, 255, 0.14);
    --code-action-color:  #c8c0b4;
    --shadow:       rgba(0, 0, 0, 0.18);

    --hljs-comment: #857c70;
    --hljs-keyword: #d89b72;
    --hljs-string:  #adba8b;
    --hljs-number:  #bca1d6;
    --hljs-title:   #9fb4d8;
    --hljs-type:    #d3bc7e;
    --hljs-attr:    #b9b3cc;
    --hljs-meta:    #a78f79;

    --annot-hl-bg:  rgba(255, 214, 102, 0.20);
  }
}

/* --------------------------------------------------------------------------
   Reset + base
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button {
  font-family: inherit;
}

/* --------------------------------------------------------------------------
   Topbar
   -------------------------------------------------------------------------- */
.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--topbar-height);
  padding: 0 24px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.brand-mark {
  width: 22px;
  height: 22px;
  color: var(--accent);
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0;
}

.brand-social {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s ease, background 0.15s ease;
}

.brand-social:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar-center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 4px;
}

.action {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  line-height: 1;
  padding: 8px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.action:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.new-paste {
  border: 1px solid var(--line);
  background: var(--paper-raised);
  color: var(--ink-soft);
  padding: 7px 14px;
}

.new-paste:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

.theme-toggle {
  width: 36px;
  height: 36px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.theme-icon {
  font-size: 18px;
  line-height: 1;
}

.fold-toggle {
  width: 36px;
  height: 36px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.fold-icon {
  font-size: 18px;
  line-height: 1;
}

.toc-toggle { display: none; }

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.layout {
  display: flex;
  padding-top: var(--topbar-height);
  min-height: 100vh;
}

.toc {
  width: var(--toc-width);
  flex-shrink: 0;
  padding: 32px 20px 32px 28px;
  position: sticky;
  top: var(--topbar-height);
  align-self: flex-start;
  max-height: calc(100vh - var(--topbar-height));
  overflow-y: auto;
  scrollbar-width: thin;
  transition: width 0.2s ease;
}

.toc.is-collapsed {
  width: 44px;
  padding: 32px 8px 32px 8px;
  overflow-y: hidden;
}

.toc.is-collapsed .toc-nav {
  opacity: 0;
  pointer-events: none;
}

.toc-pin {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: 6px;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  position: absolute;
  top: 16px;
  right: 12px;
  z-index: 10;
  transition: color 0.15s ease, background 0.15s ease, transform 0.2s ease;
}

.toc-pin:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.toc.is-collapsed .toc-pin {
  right: auto;
  left: 50%;
  transform: translateX(-50%);
}

.toc.is-collapsed .toc-pin-icon {
  transform: rotate(180deg);
}

.toc-pin-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

@media (min-width: 769px) {
  .toc-pin {
    display: inline-flex;
  }
}

.toc::-webkit-scrollbar { width: 6px; }
.toc::-webkit-scrollbar-thumb { background: var(--line); border-radius: 3px; }

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

.toc-title {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 10px 12px;
}

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

.toc-list li {
  margin: 0;
}

.toc-list a {
  display: block;
  text-decoration: none;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.35;
  padding: 4px 0 4px 12px;
  border-left: 2px solid transparent;
  transition: color 0.12s ease, border-color 0.12s ease;
}

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

.toc-list a.active {
  color: var(--accent);
  border-left-color: var(--accent);
}

.toc-list .toc-h2 { padding-left: 20px; }
.toc-list .toc-h3 { padding-left: 28px; font-size: 13px; }

.toc-list .katex {
  font-size: 1em;
  line-height: 1;
}

.toc-list .katex-display {
  display: inline;
  margin: 0;
}

.toc-empty {
  font-size: 13px;
  color: var(--muted);
  padding-left: 12px;
  font-style: italic;
}

.main {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 32px 28px 72px;
}

.article {
  width: 100%;
}

/* --------------------------------------------------------------------------
   Empty state
   -------------------------------------------------------------------------- */
.empty {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--paper);
  padding: 24px;
  text-align: center;
}

.empty-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 400px;
}

.empty-title {
  font-family: var(--font-serif);
  font-size: 54px;
  font-weight: 500;
  line-height: 1;
  color: var(--accent);
  margin: 0 0 16px;
  letter-spacing: -0.5px;
}

.empty-cn {
  display: inline-block;
  margin-left: 12px;
  font-family: "Songti TC", "Noto Serif CJK TC", "Source Han Serif TC", "Songti SC", "Noto Serif CJK SC", serif;
  font-weight: 500;
  font-size: 58px;
  color: var(--ink-soft);
  line-height: 1;
  vertical-align: baseline;
  letter-spacing: 0.04em;
}

.empty-subtitle {
  font-family: var(--font-serif);
  font-size: 21px;
  color: var(--ink-soft);
  margin: 0;
  letter-spacing: 0.01em;
}

.empty-kbd {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent);
  border-radius: 10px;
  padding: 12px 22px;
  margin: 28px 0 20px;
  box-shadow: 0 1px 2px var(--shadow);
  letter-spacing: 0.04em;
}

.empty-footer {
  font-size: 12px;
  color: var(--muted);
  margin: 0;
  line-height: 1.8;
  letter-spacing: 0.01em;
}

.empty-footer a {
  color: var(--ink-soft);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--ink-soft) 35%, transparent);
  text-underline-offset: 2px;
}

.empty-hints {
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 32px;
  letter-spacing: 0.03em;
}

/* Hide empty state when reading */
body.is-reading .empty {
  display: none;
}

body.is-reading .new-paste {
  display: inline-flex;
}

body.is-empty .new-paste,
body.is-empty .toc-toggle {
  display: none;
}

body.is-snippet .toc {
  display: none;
}

/* --------------------------------------------------------------------------
   Article typography
   -------------------------------------------------------------------------- */
.article {
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.55;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.article :first-child { margin-top: 0; }

.article h1,
.article h2,
.article h3,
.article h4,
.article h5,
.article h6 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.25;
  color: var(--ink);
  margin: 1.2em 0 0.45em;
  letter-spacing: 0;
  scroll-margin-top: calc(var(--topbar-height) + 24px);
}

.article h1 { font-size: 2em; }
.article h2 { font-size: 1.55em; }
.article h3 { font-size: 1.25em; }
.article h4 { font-size: 1.1em; }
.article h5 { font-size: 1em; }
.article h6 { font-size: 0.95em; color: var(--ink-soft); }

/* --------------------------------------------------------------------------
   Document title (editable)
   -------------------------------------------------------------------------- */
.doc-title {
  font-family: var(--font-serif);
  font-size: 1.6em;
  font-weight: 500;
  color: var(--ink);
  margin: 0 auto 1em;
  padding: 0 0 0.35em;
  border-bottom: 1px solid var(--line);
  outline: none;
  transition: border-color 0.15s ease;
  cursor: text;
  letter-spacing: 0;
  line-height: 1.3;
}

.doc-title:hover {
  border-bottom-color: color-mix(in srgb, var(--accent) 50%, var(--line));
}

.doc-title:focus {
  border-bottom-color: var(--accent);
}

/* --------------------------------------------------------------------------
   Article metadata (frontmatter)
   -------------------------------------------------------------------------- */
.article-meta {
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1.5;
  margin: 0 auto 1.6em;
  padding: 14px 18px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  box-shadow: 0 1px 3px var(--shadow);
}

.article-meta-row {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 5px 0;
}

.article-meta-row + .article-meta-row {
  border-top: 1px solid var(--line);
}

.article-meta-label {
  flex-shrink: 0;
  min-width: 5em;
  color: var(--muted);
  font-weight: 500;
  text-transform: capitalize;
  letter-spacing: 0.02em;
}

.article-meta-value {
  color: var(--ink-soft);
  word-break: break-word;
}

.article-meta-value a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-meta-value a:hover {
  color: var(--accent);
}

.article-meta-tag {
  display: inline-block;
  padding: 2px 8px;
  margin: 2px 4px 2px 0;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
  border-radius: 999px;
  font-size: 12px;
  line-height: 1.4;
}

@media (max-width: 768px) {
  .article-meta {
    padding: 12px 14px;
    margin-bottom: 1.2em;
  }
}

/* --------------------------------------------------------------------------
   Foldable sections (Vim-inspired)
   -------------------------------------------------------------------------- */
.fold-section {
  position: relative;
}

.fold-heading {
  cursor: pointer;
  position: relative;
  padding-right: 2.8em;
  transition: color 0.12s ease;
}

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

.fold-heading::before {
  content: '▾';
  position: absolute;
  left: -1.2em;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  font-size: 0.75em;
  line-height: 1;
  opacity: 0.7;
  transition: opacity 0.12s ease, transform 0.15s ease;
}

.fold-section.is-collapsed .fold-heading::before {
  content: '▸';
}

.fold-heading:hover::before {
  opacity: 1;
}

.section-copy,
.section-download {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 12px;
  line-height: 1;
  padding: 4px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease;
}

.section-copy { right: 0; }
.section-download { right: 1.4em; }

.fold-heading:hover .section-copy,
.fold-heading:hover .section-download,
.section-copy:focus-visible,
.section-download:focus-visible {
  opacity: 1;
}

.section-copy:hover,
.section-download:hover {
  color: var(--accent);
}

.lead-section {
  position: relative;
}

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

.lead-copy {
  position: absolute;
  right: -1.5em;
  top: 0.1em;
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 12px;
  line-height: 1;
  padding: 4px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease;
}

.lead-section:hover .lead-copy,
.lead-copy:focus-visible {
  opacity: 1;
}

.lead-copy:hover {
  color: var(--accent);
}

.fold-body {
  display: block;
  position: relative;
}

/* A clear sentinel (classic clearfix) at the end of a ghost-carrying
   container makes it grow to contain the float, so the wrap hole stays
   contained inside its own section — without a flow-root toggle and its
   margin-collapsing side effects. */
.annot-ghost-clear {
  clear: both;
}

.fold-section.is-collapsed .fold-body {
  display: none;
}

/* --------------------------------------------------------------------------
   Annotations — selection toolbar, highlight, underline, margin notes
   -------------------------------------------------------------------------- */
.annot-toolbar {
  position: absolute;
  z-index: 150;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  background: var(--ink);
  border-radius: 8px;
  box-shadow: 0 8px 24px var(--shadow);
}

.annot-toolbar[hidden] {
  display: none;
}

.annot-toolbar button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--paper);
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
}

.annot-toolbar button:hover {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
}

.annot-toolbar button.active {
  background: var(--accent);
  color: #fff;
}

.annot-toolbar button.annot-del:hover {
  background: #b3402f;
  color: #fff;
}

[data-theme="dark"] .annot-toolbar button:hover {
  background: rgba(255, 255, 255, 0.10);
}

.annot-note-input {
  appearance: none;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 13px;
  padding: 5px 8px;
  width: 180px;
}

.annot-note-input::placeholder {
  color: color-mix(in srgb, var(--paper) 55%, transparent);
}

/* Highlight (class-based so a passage can also carry other marks) */
.article .annot-hl {
  background: var(--annot-hl-bg);
  color: inherit;
  padding: 0 1px;
  border-radius: 2px;
}

/* Underline */
.article .annot-ul {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

/* Strikethrough */
.article .annot-sl {
  text-decoration: line-through;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
}

/* Underline + strikethrough on the same passage */
.article .annot-ul.annot-sl {
  text-decoration: underline line-through;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

/* Note anchor: dotted underline + numbered superscript */
.annot-note-ref {
  border-bottom: 1px dotted var(--accent);
}

.annot-note-num {
  color: var(--accent);
  font-family: var(--font-sans);
  font-size: 0.68em;
  font-weight: 600;
  margin-left: 1px;
  user-select: none;
}

/* Notes never squeeze prose. The default is an in-flow editorial aside after
   its block; sufficiently wide layouts promote it into a separate margin rail. */
.annot-note {
  position: relative;
  float: none;
  width: min(32em, 100%);
  margin: 0.6em 0 0.9em auto;
  padding: 0.55em 0.85em;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink-soft);
  box-shadow: 0 1px 3px var(--shadow);
  transition: box-shadow 0.18s ease, opacity 0.18s ease;
}

/* Table notes stay inside their originating cell. Keeping them in normal flow
   grows only the row height instead of introducing an invalid sibling in <tr>. */
.annot-note.annot-note-in-cell {
  float: none;
  clear: both;
  width: 100%;
  margin: 0.55em 0 0.1em;
  padding: 0.45em 0.65em;
}

.annot-note.annot-note-in-rail:not(.annot-note-in-cell) {
  position: absolute;
  left: calc(100% + var(--annot-rail-gap));
  z-index: 4;
  width: var(--annot-rail-width);
  margin: 0;
}

.annot-note.annot-note-in-rail::before {
  content: '';
  position: absolute;
  top: 1.05em;
  right: 100%;
  width: var(--annot-rail-gap);
  border-top: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line));
}

/* Ghost float spacer: the invisible obstacle prose wraps around. The visible
   card is absolutely positioned over it; the browser's own line layout does
   all the wrapping (the pretext idea, with native layout). */
.annot-ghost {
  pointer-events: none;
  user-select: none;
}

.annot-note.annot-note-floated {
  position: absolute;
  z-index: 5;
  width: var(--annot-rail-width);
  margin: 0;
}

/* Note cards are draggable into the prose column (except in-cell ones). */
.annot-note:not(.annot-note-in-cell) {
  cursor: grab;
  touch-action: none;
}

/* Grip affordance: dotted handle along the accent edge, revealed on hover. */
.annot-note:not(.annot-note-in-cell)::after {
  content: '';
  position: absolute;
  left: 1px;
  top: 8px;
  bottom: 8px;
  width: 5px;
  border-radius: 2px;
  background-image: radial-gradient(circle, var(--paper) 1px, transparent 1.3px);
  background-size: 4px 5px;
  background-position: center;
  opacity: 0;
  transition: opacity 0.15s ease;
  pointer-events: none;
}

.annot-note:not(.annot-note-in-cell):hover::after,
.annot-note.is-dragging::after {
  opacity: 0.85;
}

.annot-note:not(.annot-note-in-cell) .annot-note-input {
  cursor: text;
}

.annot-note.is-dragging {
  cursor: grabbing;
  opacity: 0.97;
  box-shadow: 0 12px 30px var(--shadow);
}

/* Dragged past the prose edge: about to dock back into the margin rail. */
.annot-note.will-dock {
  opacity: 0.5;
}

/* Leader line from a floated card to its anchor passage: a transient
   wayfinding aid shown while dragging/hovering, faded out afterwards. */
.annot-leader {
  position: absolute;
  left: 0;
  top: 0;
  width: 1px;
  height: 1px;
  overflow: visible;
  z-index: 3;
  pointer-events: none;
  color: color-mix(in srgb, var(--accent) 40%, var(--line));
  opacity: 0;
  transition: opacity 0.4s ease;
}

.annot-leader.is-visible {
  opacity: 1;
}

/* --------------------------------------------------------------------------
   Snippet mode — ray-style framed card for pasted code
   -------------------------------------------------------------------------- */
.snippet-frame {
  background: #d2c5bc;
  border: 0;
  border-radius: 14px;
  padding: clamp(18px, 4vw, 44px);
  margin: 0.5em auto;
  width: max-content;
  max-width: none;
}

.snippet-card {
  position: relative;
  background: #eae5e1;
  box-shadow: inset 0 0 0 1px rgba(25,20,12,0.16), 0 18px 44px rgba(60,50,42,0.22);
  border-radius: 10px;
  overflow: hidden;
}

[data-theme="dark"] .snippet-frame {
  background: #1a1a1a;
}

[data-theme="dark"] .snippet-card {
  background: #26231f;
  box-shadow: inset 0 0 0 1px rgba(240,240,240,0.12), 0 18px 44px rgba(0,0,0,0.5);
}

.snippet-titlebar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid rgba(25,20,12,0.12);
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--muted);
  user-select: none;
}

[data-theme="dark"] .snippet-titlebar {
  border-bottom-color: rgba(240,240,240,0.10);
}

.snippet-star {
  color: var(--accent);
  font-size: 13px;
}

.snippet-filename {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink);
  outline: none;
  border-radius: 4px;
  padding: 1px 4px;
  min-width: 3em;
}

.snippet-filename:focus {
  background: var(--accent-soft);
}

.snippet-langpicker {
  position: relative;
  margin-left: auto;
}

.snippet-langtag {
  display: inline-block;
  color: var(--accent);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 9px;
  cursor: pointer;
}

.snippet-langselect {
  position: absolute;
  inset: 0;
  width: 100%;
  opacity: 0;
  cursor: pointer;
}

.snippet-copy {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 2px 9px;
  font-family: var(--font-sans);
  font-size: 12px;
  cursor: pointer;
}

.snippet-copy:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.snippet-card pre.snippet-code,
pre.snippet-code {
  width: auto;
  max-width: none;
  min-width: 220px;
  margin: 0;
  padding: 14px 18px;
  font-size: 13.5px;
  line-height: 1.65;
  box-sizing: border-box;
}

@media (max-width: 768px) {
  .snippet-frame {
    padding: 10px;
  }
}

.annot-leader path {
  stroke: currentColor;
  stroke-width: 1;
  fill: none;
}

.annot-leader circle {
  fill: currentColor;
}

body.is-note-dragging {
  user-select: none;
}

/* Hover linkage between a floated card and its anchor passage. */
span.annot.anchor-active {
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  border-radius: 2px;
}

.annot-note.anchor-active {
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 45%, transparent), 0 1px 3px var(--shadow);
}

.annot-note-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.25em;
  height: 1.25em;
  padding: 0 0.15em;
  background: var(--accent);
  color: var(--paper);
  border-radius: 999px;
  font-size: 0.72em;
  font-weight: 600;
  line-height: 1;
  margin-right: 0.25em;
  transform: translateY(-0.5px);
}

/* Note card edit / delete buttons (stripped from exports). */
.annot-note-edit,
.annot-note-del {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 11px;
  line-height: 1;
  padding: 3px 4px;
  margin-left: 2px;
  border-radius: 4px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.annot-note:hover .annot-note-edit,
.annot-note:hover .annot-note-del,
.annot-note-edit:focus-visible,
.annot-note-del:focus-visible {
  opacity: 1;
}

.annot-note-edit:hover,
.annot-note-del:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.annot-note-edit-input {
  width: 11em;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 2px 5px;
  font-size: 12px;
}

@media (max-width: 900px) {
  .annot-note {
    width: 100%;
    margin: 0.6em 0;
  }
}

/* Dark mode fold indicator */
[data-theme="dark"] .fold-heading::before {
  color: var(--accent);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .fold-heading::before {
    color: var(--accent);
  }
}

/* --------------------------------------------------------------------------
   Article width layout
   -------------------------------------------------------------------------- */
.article > .fold-section {
  max-width: none;
}

.fold-section > .fold-heading,
.fold-section > .fold-body {
  max-width: var(--article-max);
  margin-left: auto;
  margin-right: auto;
}

.article p {
  margin: 0.55em 0;
}

.article a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 38%, transparent);
  text-underline-offset: 2px;
  transition: text-decoration-color 0.15s ease;
}

.article a:hover {
  text-decoration-color: var(--accent);
}

.article strong {
  font-weight: 500;
  color: var(--ink);
}

.article em {
  font-style: normal;
  color: var(--accent);
}

.article ul,
.article ol {
  padding-left: 1.4em;
  margin: 0.6em 0;
}

.article li {
  margin: 0.15em 0;
}

.article ul li::marker {
  color: var(--accent);
}

.article ol li::marker {
  color: var(--accent);
  font-weight: 500;
}

.article blockquote {
  margin: 0.8em 0;
  padding: 0.1em 0 0.1em 1em;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

.article blockquote p:first-child { margin-top: 0; }
.article blockquote p:last-child { margin-bottom: 0; }

.article hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 1.5em 0;
}

/* Code — Ray paper-inspired syntax highlighting */
.article code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--code-surface);
  color: var(--code-text);
  padding: 0.12em 0.32em;
  border-radius: 4px;
  word-break: break-word;
  letter-spacing: 0;
}

.article pre {
  background: var(--code-surface);
  border-radius: 8px;
  padding: 16px 20px;
  overflow-x: auto;
  margin: 0.5em 0;
  position: relative;
  border: 1px solid var(--code-edge);
  box-shadow: inset 0 0 0 1px var(--code-shadow-inset), 0 10px 28px var(--code-shadow);
}

.article pre code {
  font-family: var(--font-mono);
  background: transparent;
  color: var(--code-text);
  padding: 0;
  font-size: 14px;
  line-height: 1.5;
  border-radius: 0;
  display: block;
  letter-spacing: 0;
  word-break: normal;
}

/* Syntax highlighting colors come from theme variables, so light and dark
   share a single set of rules. */
.article pre code .hljs-comment,
.article pre code .hljs-quote { color: var(--hljs-comment); font-style: italic; }
.article pre code .hljs-keyword,
.article pre code .hljs-selector-tag,
.article pre code .hljs-literal,
.article pre code .hljs-name { color: var(--hljs-keyword); }
.article pre code .hljs-string,
.article pre code .hljs-regexp,
.article pre code .hljs-addition { color: var(--hljs-string); }
.article pre code .hljs-number,
.article pre code .hljs-symbol,
.article pre code .hljs-bullet,
.article pre code .hljs-link { color: var(--hljs-number); }
.article pre code .hljs-title,
.article pre code .hljs-section { color: var(--hljs-title); }
.article pre code .hljs-type,
.article pre code .hljs-built_in,
.article pre code .hljs-class { color: var(--hljs-type); }
.article pre code .hljs-attr,
.article pre code .hljs-attribute,
.article pre code .hljs-variable,
.article pre code .hljs-template-variable,
.article pre code .hljs-property { color: var(--hljs-attr); }
.article pre code .hljs-meta,
.article pre code .hljs-doctag,
.article pre code .hljs-deletion { color: var(--hljs-meta); }

/* Copy button inside code blocks */
.code-copy {
  position: absolute;
  top: 6px;
  right: 12px;
  appearance: none;
  border: 1px solid var(--code-action-border);
  background: var(--code-action-bg);
  color: var(--code-action-color);
  font-family: var(--font-sans);
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  cursor: pointer;
  opacity: 0;
  z-index: 1;
  transition: opacity 0.15s ease, color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.code-lang {
  position: absolute;
  top: 8px;
  right: 12px;
  font-family: var(--font-sans);
  font-size: 10px;
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--code-action-color);
  pointer-events: none;
  user-select: none;
  transition: opacity 0.15s ease;
}

.article pre:hover .code-copy,
.code-copy:focus-visible {
  opacity: 1;
}

.article pre:hover .code-lang {
  opacity: 0;
}

.code-copy:hover,
.code-copy.copied {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--code-action-hover-bg);
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  margin: 0.9em 0;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.article table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95em;
  margin: 0;
  min-width: 480px;
}

.article th,
.article td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.article th {
  font-weight: 600;
  color: var(--ink-soft);
  background: var(--paper-raised);
}

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

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  margin: 0.9em 0;
}

/* Left-align display math so it lines up with body text instead of
   appearing to float off-center alongside left-justified paragraphs. */
.article .katex-display > .katex {
  text-align: left;
}

.katex {
  font-size: 1em;
}

/* Images */
.article img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  display: block;
  margin: 0.9em auto;
}

.article figure {
  margin: 0.9em 0;
}

.article figcaption {
  font-size: 13px;
  color: var(--muted);
  text-align: center;
  margin-top: 0.4em;
}

/* Top-level content before the first heading is not wrapped in a fold-section,
   so constrain it to the same reading column after element margin shorthands. */
.article > :not(.fold-section):not(pre):not(.snippet-frame) {
  max-width: var(--article-max);
  margin-left: auto;
  margin-right: auto;
}

/* Wide reading surfaces reserve a real annotation lane. The prose keeps its
   full measure; the whole prose+rail composition is centered as one unit. */
.article.has-note-rail > .fold-section > .fold-heading,
.article.has-note-rail > .fold-section > .fold-body,
.article.has-note-rail > :not(.fold-section):not(pre):not(.snippet-frame) {
  margin-left: max(16px, calc(50% - 552px));
  margin-right: 0;
}

.article.has-note-rail pre,
.article.has-note-rail .fold-body pre {
  max-width: var(--article-max);
}

/* Adaptive code blocks: at least reading-column width, wider only when needed. */
.article pre,
.fold-body pre {
  width: max-content;
  min-width: min(100%, var(--article-max));
  max-width: calc(100vw - var(--toc-width) - 56px);
  margin: 0.5em auto;
  overflow-x: auto;
}

@media (max-width: 768px) {
  .article pre,
  .fold-body pre {
    max-width: calc(100vw - 40px);
  }
}

/* --------------------------------------------------------------------------
   Toast
   -------------------------------------------------------------------------- */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  z-index: 200;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 13px;
  padding: 10px 18px;
  border-radius: 999px;
  box-shadow: 0 4px 16px var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Drag and drop overlay — full-viewport dashed frame shown while a file is
   dragged over the page. pointer-events: none keeps the drop target live. */
body.is-dragover::after {
  content: 'Drop to open';
  position: fixed;
  inset: 16px;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  border: 2px dashed var(--accent);
  border-radius: 12px;
  color: var(--accent);
  font-family: var(--font-sans);
  font-size: 15px;
  letter-spacing: 0.04em;
  pointer-events: none;
}

.copy-all,
.download-all,
.png-all,
.html-all,
.copy-png {
  position: fixed;
  right: 24px;
  z-index: 70;
  width: 36px;
  height: 36px;
  appearance: none;
  border: 1px solid var(--line);
  background: var(--paper-raised);
  color: var(--ink-soft);
  border-radius: var(--radius);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px var(--shadow);
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease, opacity 0.15s ease;
}

.copy-all:hover,
.copy-all.copied,
.download-all:hover,
.download-all.copied,
.png-all:hover,
.png-all.copied,
.html-all:hover,
.html-all.copied,
.copy-png:hover,
.copy-png.copied {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.copy-all {
  bottom: 24px;
}

.download-all {
  bottom: 68px;
}

.png-all {
  bottom: 112px;
}

.copy-png {
  bottom: 156px;
}

.html-all {
  bottom: 200px;
}

/* --------------------------------------------------------------------------
   Mobile / drawer
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --topbar-height: 56px;
  }

  .topbar {
    padding: 0 16px;
  }

  .toc {
    position: fixed;
    top: var(--topbar-height);
    left: 0;
    bottom: 0;
    width: 260px;
    padding: 24px;
    background: var(--paper-raised);
    border-right: 1px solid var(--line);
    z-index: 90;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: 4px 0 24px var(--shadow);
  }

  .toc.is-open {
    transform: translateX(0);
  }

  .toc-backdrop {
    position: fixed;
    inset: var(--topbar-height) 0 0 0;
    background: rgba(0, 0, 0, 0.18);
    z-index: 80;
  }

  .toc-backdrop:not([hidden]) {
    display: block;
  }

  .toc-toggle {
    display: inline-flex;
  }

  body.is-empty .toc-toggle {
    display: none;
  }

  .main {
    padding: 24px 20px 64px;
  }

  .article {
    font-size: 15px;
    line-height: 1.55;
  }

  .article pre {
    padding: 14px 16px;
  }

  .article pre code {
    font-size: 13px;
    line-height: 1.5;
  }

  .lead-copy {
    right: 0;
    opacity: 1;
  }

  .code-copy {
    opacity: 1;
    top: 3px;
    right: 12px;
  }

  .code-lang {
    opacity: 0;
    top: 5px;
    right: 12px;
  }

  .empty-title {
    font-size: 52px;
  }

  .empty-subtitle {
    font-size: 18px;
  }
}

/* --------------------------------------------------------------------------
   Reduced motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --------------------------------------------------------------------------
   Focus visibility
   -------------------------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:focus:not(:focus-visible) {
  outline: none;
}

/* Utility: visually hidden screen-reader text if needed */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}