/* Operate: ruled working surfaces. Read: a separate, serif reading column. */
:root {
  color-scheme: light;
  --canvas: #ffffff;
  --surface: #f4f4f4;
  --ink: #191919;
  --muted: #595959;
  --line: #d0d0d0;
  --control: #737373;
  --button: #191919;
  --button-ink: #ffffff;
  --button-hover: #383838;
  --button-active: #000000;
  --sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  --text-small: .875rem;
  --text-body: 1rem;
  --text-prose: 1.125rem;
  --text-section: 1.25rem;
  --text-title: 2.5rem;
}
* { box-sizing: border-box; }
html { text-size-adjust: 100%; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--canvas); color: var(--ink); font: var(--text-body)/1.6 var(--sans); }
::selection { background: var(--ink); color: var(--canvas); }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .2em; overflow-wrap: anywhere; }
a:hover { text-decoration-thickness: 2px; }
a:active { color: var(--muted); text-decoration-style: double; }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; }
:target { scroll-margin-block: 1.5rem; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; overflow-wrap: anywhere; }
h1 { margin: 0 0 1rem; font-size: var(--text-title); letter-spacing: -.035em; font-weight: 700; }
h2 { margin: 0 0 1.25rem; font-size: var(--text-section); letter-spacing: -.015em; }
h3 { margin: 0 0 .5rem; font-size: var(--text-prose); }
h4, h5, h6 { margin: 0 0 1rem; font-size: var(--text-body); }
p { margin: 0 0 1rem; overflow-wrap: anywhere; }
form { margin: 0; }
button, input, select, textarea { font: inherit; }
button, input, select, textarea, fieldset { max-width: 100%; }
input, select, textarea {
  width: 100%; min-width: 0; min-height: 2.75rem; padding: .625rem .75rem;
  border: 1px solid var(--control); border-radius: .125rem;
  background: var(--canvas); color: var(--ink); caret-color: var(--ink); line-height: 1.5;
}
input::placeholder, textarea::placeholder { color: var(--muted); opacity: 1; }
input:hover, select:hover, textarea:hover { border-color: var(--ink); }
input:active, select:active, textarea:active { border-color: var(--ink); }
input:focus-visible, select:focus-visible, textarea:focus-visible { border-color: var(--ink); }
textarea { display: block; min-height: 7rem; resize: vertical; }
input[readonly], textarea[readonly] { background: var(--surface); }
input[type="hidden"] { display: none; }
input[type="file"] { padding: .375rem; font-size: var(--text-small); }
button, input[type="file"]::file-selector-button {
  min-height: 2.75rem; padding: .625rem 1rem; border: 1px solid var(--button);
  border-radius: .125rem; background: var(--button); color: var(--button-ink);
  font: 600 var(--text-body)/1.5 var(--sans); white-space: normal; overflow-wrap: anywhere; cursor: pointer;
}
input[type="file"]::file-selector-button { margin-inline-end: .75rem; }
button:hover, input[type="file"]:hover::file-selector-button { background: var(--button-hover); border-color: var(--button-hover); }
button:active, input[type="file"]:active::file-selector-button { background: var(--button-active); border-color: var(--button-active); }
.button-quiet, .button-danger { color: var(--ink); background: var(--canvas); border-color: var(--control); }
.button-quiet:hover, .button-danger:hover { color: var(--ink); background: var(--surface); border-color: var(--ink); }
.button-quiet:active, .button-danger:active { color: var(--button-ink); background: var(--button-active); border-color: var(--button-active); }
.button-danger { border-width: 2px; }
input[type="checkbox"], input[type="radio"] {
  flex: 0 0 auto; width: 1.25rem; height: 1.25rem; min-height: 0;
  margin: .125rem 0 0; padding: 0; accent-color: var(--ink); cursor: pointer;
}
input:user-invalid, select:user-invalid, textarea:user-invalid,
[aria-invalid="true"] { border: 2px dashed var(--ink); }
button:disabled, input:disabled, select:disabled, textarea:disabled,
fieldset:disabled button, [aria-disabled="true"] {
  color: var(--muted); background: var(--surface); border-color: var(--control);
  border-style: dashed; opacity: 1; cursor: not-allowed;
}
input:disabled::file-selector-button { color: var(--muted); background: var(--surface); border-color: var(--control); cursor: not-allowed; }
label, legend { display: block; margin-bottom: .375rem; font-weight: 600; line-height: 1.5; overflow-wrap: anywhere; }
fieldset { min-width: 0; margin: 0; padding: 0; border: 0; }
legend { padding: 0; }
code, pre, .mono { font-family: var(--mono); font-size: var(--text-small); }
code { padding: .125rem .25rem; background: var(--surface); overflow-wrap: anywhere; }
.shell { width: min(76rem, calc(100% - 4rem)); margin-inline: auto; }
main.shell { padding-block: 3rem 5rem; }
.narrow { max-width: 44rem; }
.site-header { border-bottom: 1px solid var(--line); }
.header-inner { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 2rem; min-height: 5rem; padding-block: .75rem; }
.brand { display: inline-flex; flex-wrap: wrap; align-items: baseline; gap: .25rem 1rem; min-height: 2.75rem; align-content: center; margin-inline-end: auto; text-decoration: none; }
.brand-word { font-size: var(--text-section); font-weight: 750; letter-spacing: -.025em; }

.site-nav, .actions, .reader-nav { display: flex; flex-wrap: wrap; align-items: center; gap: .25rem 1.5rem; }
.site-nav a, .actions a, .reader-nav a, .breadcrumbs a { display: inline-flex; align-items: center; min-height: 2.75rem; }
.site-nav { font-size: var(--text-small); }
.site-nav a { text-decoration: none; border-bottom: 2px solid transparent; }
.site-nav a:hover { border-color: var(--control); }
.site-nav a[aria-current="page"] { font-weight: 700; border-color: var(--ink); }
.header-inner form { flex: 0 0 auto; }
.skip-link { position: absolute; inset-block-start: .75rem; inset-inline-start: 1rem; z-index: 10; padding: .75rem 1rem; background: var(--canvas); border: 2px solid var(--ink); transform: translateY(-200%); }
.skip-link:focus { transform: none; }
.page-heading { max-width: 54rem; margin-bottom: 2.5rem; }
.page-heading > :last-child, .panel > :last-child, .danger-zone > :last-child { margin-bottom: 0; }
.breadcrumbs { margin-bottom: 1rem; font-size: var(--text-small); }
.muted, .hint, .optional, .item-meta { color: var(--muted); }
.hint, .optional, .item-meta { font-size: var(--text-small); }
.optional { font-weight: 400; }
.hint { margin-block: .5rem 1rem; }
.description { white-space: pre-line; }
.section { margin-top: 2.5rem; }
.section-heading { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: .5rem 1rem; margin-bottom: .75rem; }
.section-heading h2 { margin: 0; }
.subsection { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.panel { min-width: 0; padding-block: 1.5rem; border-top: 1px solid var(--line); }
.stack { display: grid; gap: 1.25rem; }
.stack > *, .form-grid > *, .scope-grid > *, .filter-bar > *, .library-layout > * { min-width: 0; }
.form-grid, .scope-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem; align-items: start; }
.scope-grid { gap: .5rem 2rem; }
.filter-bar { display: flex; flex-wrap: wrap; align-items: end; gap: .75rem; margin-bottom: 1.5rem; }
.filter-bar .grow { flex: 1 1 14rem; }
.filter-bar > div:not(.grow) { flex: 1 1 13rem; }
.filter-bar label { font-size: var(--text-small); }
.filter-bar button { flex: 0 0 auto; }
.library-heading { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 1rem 2rem; max-width: none; }
.library-heading > div { min-width: 0; }
.library-total { color: var(--muted); font-size: var(--text-small); font-variant-numeric: tabular-nums; white-space: nowrap; }
.library-layout { display: grid; grid-template-columns: minmax(0, 1fr) 18rem; align-items: start; gap: 3rem; }
.library-compose { min-width: 0; padding-inline-start: 2rem; border-inline-start: 1px solid var(--line); }
.library-compose .panel { padding: 0; border: 0; }
.library-compose .section { margin-top: 0; }
.library-compose h2 { margin-bottom: 1.5rem; }
.search-panel { padding-block: 1.5rem .5rem; border-block: 1px solid var(--line); }
.project-grid { display: block; }
.project-card { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem 2rem; padding-block: 1.25rem; border-bottom: 1px solid var(--line); }
.project-card-main { flex: 1 1 auto; min-width: 0; }
.project-card h3 { margin: 0; }
.project-card h3 a { display: inline-flex; align-items: center; min-height: 2.75rem; text-decoration: none; }
.project-card h3 a:hover { text-decoration: underline; }
.project-card p { margin-bottom: 0; }
.project-card .item-meta { flex: 0 1 12rem; font-variant-numeric: tabular-nums; }
.project-card .description, .project-card .muted { max-width: 60ch; }
.notice { margin-bottom: 1.5rem; padding: 1rem; border: 1px solid var(--line); background: var(--surface); overflow-wrap: anywhere; }
.notice-error { border: 1px dashed var(--ink); }
.notice > :last-child { margin-bottom: 0; }
.empty-state { padding-block: 1.5rem; color: var(--muted); border-block: 1px solid var(--line); }
.note-list, .attachment-list { margin: 0; padding: 0; list-style: none; }
.note-list li { padding-block: 1rem; border-bottom: 1px solid var(--line); }
.item-title { display: flex; align-items: center; min-height: 2.75rem; font-size: var(--text-prose); font-weight: 600; }
.item-meta { display: inline-block; }
.managed-notes { border-top: 1px solid var(--line); }
.managed-note { display: flex; align-items: center; justify-content: space-between; gap: .5rem 1.5rem; }
.managed-note-main { flex: 1 1 auto; min-width: 0; }
.managed-note .item-title { font-size: var(--text-body); text-decoration: none; }
.managed-note .item-title:hover { text-decoration: underline; }
.managed-note .item-meta { margin: .125rem 0 0; }
.note-settings-link { display: inline-flex; align-items: center; min-height: 2.75rem; flex: 0 0 auto; font-size: var(--text-small); }
.disclosure > summary { min-height: 2.75rem; padding-block: .5rem; font-size: var(--text-body); font-weight: 600; cursor: pointer; }
.disclosure > summary:hover { text-decoration: underline; text-underline-offset: .2em; }
.disclosure[open] > summary { margin-bottom: 1.25rem; }
.disclosure > summary::marker { color: var(--muted); }
.note-management { margin-top: 1.5rem; padding-block: 2rem; }
.key-list { border-top: 1px solid var(--line); }
.key-card { margin: 0; padding-block: .5rem; border-bottom: 1px solid var(--line); }
.key-summary { display: inline-flex; align-items: baseline; justify-content: space-between; gap: .5rem 1rem; width: calc(100% - 1.5rem); vertical-align: top; }
.key-name { min-width: 0; overflow-wrap: anywhere; }
.key-summary .badge { flex: 0 0 auto; margin: 0; }
.key-card-body { padding-block: .25rem 1rem; }
.note-heading { margin-bottom: 2rem; }
.note-heading .item-meta { margin-bottom: 1rem; }
.attachment-list { margin-top: 1.5rem; }
.attachment { padding-block: 1.5rem; border-top: 1px solid var(--line); }
.attachment .item-meta { margin-inline-start: .5rem; }
.compact-form { margin-top: 1rem; }
.check { display: flex; align-items: flex-start; gap: .75rem; min-height: 2.75rem; margin: 0; padding: .625rem .25rem; font-weight: 400; cursor: pointer; }
.check span { min-width: 0; overflow-wrap: anywhere; }
.check:hover { background: var(--surface); }
.check:active { outline: 1px solid var(--control); outline-offset: -1px; }
.check:has(input:disabled) { color: var(--muted); cursor: not-allowed; }
.danger-zone { padding-block: 1.5rem; border-top: 2px solid var(--ink); }
.danger-zone h2, .danger-zone h3, .danger-zone h4 { font-weight: 750; }
.choice-list { max-height: 18rem; overflow-y: auto; overscroll-behavior: contain; padding: .5rem; border: 1px solid var(--control); }
.choice-list p { margin: 0; }
.secret-panel { padding: 1.5rem; border: 2px solid var(--ink); }
.badge { display: inline-block; margin-inline-start: .5rem; padding: .125rem .5rem; border: 1px solid var(--control); font-size: var(--text-small); font-weight: 400; vertical-align: middle; }
.key-details { display: grid; grid-template-columns: 12rem minmax(0, 1fr); gap: .5rem 1.5rem; margin-block: 1rem 1.5rem; font-size: var(--text-small); }
.key-details dt { color: var(--muted); }
.key-details dd { min-width: 0; margin: 0; overflow-wrap: anywhere; }
/* The login pane remains dark in both OS schemes; controls use local tokens. */
main.auth-layout { width: min(27rem, calc(100% - 4rem)); padding-block: 4rem; }
.login-panel {
  color-scheme: dark; --canvas: #191919; --surface: #292929; --ink: #ffffff;
  --muted: #c4c4c4; --line: #737373; --control: #969696;
  --button: #ffffff; --button-ink: #191919; --button-hover: #dddddd; --button-active: #c4c4c4;
  min-width: 0; padding: 2.5rem; border: 0; background: var(--canvas); color: var(--ink);
}
.login-panel h1 { margin-bottom: 1.5rem; font-size: 1.5rem; letter-spacing: normal; }
.login-panel .stack > button { width: 100%; margin-top: .5rem; }

input:-webkit-autofill { -webkit-text-fill-color: var(--ink); -webkit-box-shadow: 0 0 0 1000px var(--canvas) inset; caret-color: var(--ink); }
/* Read: no app chrome, floating tools, or image color transformations. */
.reader { background: var(--canvas); }
.reader-shell { width: min(72ch, calc(100% - 4rem)); margin-inline: auto; padding-block: 2rem 5rem; font: var(--text-prose)/1.8 Georgia, "Times New Roman", serif; }
.reader-shell > *, .reader-shell article, .markdown { min-width: 0; max-width: 100%; }
.reader-nav { margin-bottom: 2.5rem; font: var(--text-small)/1.5 var(--sans); }
.reader-heading { margin-bottom: 2.5rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--line); }
.reader-heading h1 { margin: 0; font-family: var(--sans); }
.markdown { overflow-wrap: anywhere; }
.markdown > :first-child { margin-top: 0; }
.markdown h1, .markdown h2, .markdown h3, .markdown h4, .markdown h5, .markdown h6 { margin-block: 2rem 1rem; font-family: var(--sans); }
.markdown h1 { font-size: 2rem; }
.markdown h2 { font-size: 1.5rem; }
.markdown h3 { font-size: var(--text-section); }
.markdown p, .markdown ul, .markdown ol, .markdown blockquote { margin-block: 0 1.25rem; }
.markdown ul, .markdown ol { padding-inline-start: 1.5rem; }
.markdown li { margin-block: .375rem; }
.markdown li > p, .markdown li > ul, .markdown li > ol { margin-bottom: .5rem; }
.markdown blockquote { margin-inline: 0; padding-inline-start: 1.25rem; border-inline-start: 1px solid var(--control); color: var(--muted); }
.markdown blockquote > :last-child { margin-bottom: 0; }
.markdown hr { margin-block: 2rem; border: 0; border-top: 1px solid var(--line); }
.markdown figure { max-width: 100%; margin: 1.5rem 0; }
.markdown img, .markdown video { display: block; max-width: 100%; height: auto; margin-inline: auto; }
.markdown figcaption { margin-top: .75rem; font: var(--text-small)/1.6 var(--sans); color: var(--muted); }
.markdown pre { max-width: 100%; margin-block: 1.5rem; padding: 1rem; overflow-x: auto; overscroll-behavior-x: contain; background: var(--surface); color: var(--ink); line-height: 1.65; white-space: pre; overflow-wrap: normal; word-break: normal; tab-size: 4; }
.markdown pre code { padding: 0; background: transparent; color: inherit; font-size: inherit; white-space: inherit; overflow-wrap: inherit; }
.markdown table { display: block; width: max-content; max-width: 100%; margin-block: 1.5rem; overflow-x: auto; overscroll-behavior-x: contain; border-collapse: collapse; font-size: var(--text-body); line-height: 1.5; }
.markdown th, .markdown td { padding: .625rem .75rem; border: 1px solid var(--control); vertical-align: top; }
.markdown th { background: var(--surface); font-family: var(--sans); text-align: start; }
.markdown .math-display, .markdown .math-source, .markdown .katex-display { display: block; max-width: 100%; overflow-x: auto; overflow-y: hidden; overscroll-behavior-x: contain; padding-block: .5rem; white-space: pre; overflow-wrap: normal; }
.markdown .math-inline { display: inline-block; max-width: 100%; overflow-x: auto; overflow-y: hidden; vertical-align: middle; white-space: nowrap; }
.markdown .math .katex { white-space: nowrap; overflow-wrap: normal; }
.markdown .katex-error { color: var(--ink) !important; border-bottom: 1px dashed var(--control); }
.markdown .task-marker { color: var(--muted); font-family: var(--sans); }
/* syntax.css loads later: override token colors, never token/line display. */
.markdown .syntax-chroma, .markdown .syntax-bg { background-color: var(--surface) !important; color: var(--ink) !important; }
.markdown .syntax-chroma [class] { color: var(--ink) !important; background-color: transparent !important; }
.markdown .syntax-chroma [class^="syntax-k"] { font-weight: 700; }
.markdown .syntax-chroma [class^="syntax-c"] { color: var(--muted) !important; font-style: italic; }
.markdown .syntax-chroma .syntax-ln, .markdown .syntax-chroma .syntax-lnt { color: var(--muted) !important; }
.markdown .syntax-chroma .syntax-hl { background-color: var(--canvas) !important; }
.markdown .syntax-chroma a:focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; }
.markdown .syntax-chroma .syntax-err { text-decoration: underline wavy; }
.markdown .syntax-chroma .syntax-gd { text-decoration: line-through; }
.markdown .syntax-chroma .syntax-gi { text-decoration: underline; }
.markdown .syntax-lntable { display: table; width: auto; margin: 0; overflow: visible; }
.markdown .syntax-lntable td { min-width: 0; padding: 0; border: 0; }
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark; --canvas: #141414; --surface: #242424; --ink: #eeeeee;
    --muted: #b5b5b5; --line: #484848; --control: #909090;
    --button: #eeeeee; --button-ink: #141414; --button-hover: #d0d0d0; --button-active: #b5b5b5;
  }
}
@media (max-width: 68rem) {
  .library-layout { grid-template-columns: minmax(0, 1fr) 17rem; gap: 2rem; }
  .library-compose { padding-inline-start: 1.5rem; }
  main.auth-layout { padding-block: 3rem; }
  .login-panel { padding: 2rem; }
  .project-card { display: block; }
  .project-card .item-meta { margin-top: .5rem; }
}
@media (max-width: 52rem) {
  .library-layout { grid-template-columns: minmax(0, 1fr); gap: 2.5rem; }
  .library-compose { padding: 1.5rem 0 0; border-inline-start: 0; border-top: 1px solid var(--line); }

  .form-grid { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 38rem) {
  :root { --text-title: 2rem; }
  .shell, .reader-shell { width: calc(100% - 2rem); }
  main.shell { padding-block: 2rem 3rem; }
  .header-inner { gap: .25rem 1rem; padding-block: .5rem; }
  .brand { flex-direction: column; gap: 0; }
  .site-nav { order: 3; flex-basis: 100%; }

  .page-heading { margin-bottom: 2rem; }
  .library-heading { gap: .5rem; }
  .library-total { margin-bottom: .5rem; }
  .filter-bar > div, .filter-bar .grow, .filter-bar > button { flex: 1 1 100%; }
  .scope-grid { grid-template-columns: minmax(0, 1fr); }
  .managed-note { align-items: flex-start; gap: .5rem 1rem; }
  .managed-note .item-meta { display: block; font-size: .8125rem; }
  .key-details { grid-template-columns: minmax(0, 1fr); gap: .25rem; }
  .key-details dd { margin-bottom: .75rem; }
  .login-panel { padding: 1.5rem; }
  main.auth-layout { width: calc(100% - 2rem); }
  .reader-shell { padding-block: 1.5rem 3rem; }
  .reader-nav, .reader-heading { margin-bottom: 1.5rem; }
  .markdown pre { padding: .75rem; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}
@media (forced-colors: active) {
  :root, .login-panel { --canvas: Canvas; --surface: Canvas; --ink: CanvasText; --muted: CanvasText; --line: CanvasText; --control: ButtonText; --button: ButtonFace; --button-ink: ButtonText; --button-hover: ButtonFace; --button-active: ButtonFace; }
  a { color: LinkText; }
  :focus-visible { outline-color: Highlight; }
  button, input, select, textarea, .login-panel { border: 1px solid ButtonText; }
  input[type="checkbox"], input[type="radio"] { accent-color: auto; }
  button:disabled, input:disabled, select:disabled, textarea:disabled, [aria-disabled="true"] { color: GrayText; border-color: GrayText; }
  .site-nav a[aria-current="page"] { border-color: Highlight; }
  ::selection { color: HighlightText; background: Highlight; }
}
@media print {
  :root, .login-panel { color-scheme: light; --canvas: #ffffff; --surface: #ffffff; --ink: #000000; --muted: #383838; --line: #737373; --control: #737373; }
  @page { margin: 18mm; }
  .site-header, .skip-link, .reader-nav, .actions, form, .library-compose { display: none; }
  .shell, .reader-shell { width: 100%; max-width: none; margin: 0; padding: 0; }
  main.shell, main.auth-layout { padding: 0; }
  .library-layout, .form-grid, main.auth-layout { display: block; }
  .reader-shell, .markdown { font-size: 11pt; line-height: 1.6; }
  h1, h2, h3, h4, .reader-heading { break-after: avoid; }
  p { orphans: 3; widows: 3; }
  .markdown pre, .markdown pre code, .markdown .math-source { white-space: pre-wrap; overflow-wrap: anywhere; }
  .markdown table { display: table; width: 100%; table-layout: fixed; font-size: 9pt; }
  .markdown .syntax-lntable { width: auto; table-layout: auto; }
  .markdown .math-display, .markdown .katex-display, .markdown .math-inline { overflow: visible; white-space: normal; }
  .markdown img { max-height: 230mm; object-fit: contain; break-inside: avoid; }
  .markdown a { text-decoration: underline; }
}