:root {
  color-scheme: light;
  --paper: #f7f3e9; --rail: #eee8db; --ink: #302d27; --muted: #696052;
  --rule: #c2b8a5; --accent: #43553c; --on-accent: #fff; --wash: #e0e3d5;
  --sans: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --serif: "Iowan Old Style", "AppleMyungjo", "Batang", "Noto Serif CJK KR", serif;
  --size: 20px; --leading: 1.9; --measure: 36em; --reading-font: var(--serif);
  --s1: 4px; --s2: 8px; --s3: 12px; --s4: 16px; --s6: 24px; --s8: 32px; --s12: 48px; --s16: 64px;
}
:root[data-theme="white"] { --paper: #fff; --rail: #f4f4f1; --ink: #242722; }
:root[data-theme="dark"] { color-scheme: dark; --paper: #20231f; --rail: #292d27; --ink: #eeeade; --muted: #bcbfad; --rule: #727966; --accent: #c1d0ae; --on-accent: #20231f; --wash: #394232; }
:root[data-theme="blackwhite"] { --paper: #fff; --rail: #fff; --ink: #000; --muted: #000; --rule: #000; --accent: #000; --on-accent: #fff; --wash: #e7e7e7; }
@media (prefers-color-scheme: dark) {
  :root[data-theme="system"] { color-scheme: dark; --paper: #20231f; --rail: #292d27; --ink: #eeeade; --muted: #bcbfad; --rule: #727966; --accent: #c1d0ae; --on-accent: #20231f; --wash: #394232; }
}
* { box-sizing: border-box; scrollbar-color: var(--rule) var(--paper); scrollbar-width: thin; }
[hidden] { display: none !important; }
html { scroll-padding-top: 96px; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 15px/1.6 var(--sans); }
::selection { background: var(--wash); color: var(--ink); }
a { color: inherit; text-underline-offset: .22em; }
button, input, select { font: inherit; color: inherit; }
button, select, input[type="search"] { min-height: 44px; border: 1px solid var(--rule); border-radius: 4px; background: var(--paper); padding: var(--s2) var(--s3); }
button { cursor: pointer; }
button:hover, a:hover { background-color: var(--wash); }
button:active { background: var(--rule); }
button:disabled { opacity: .55; cursor: default; }
button[aria-pressed="true"] { background: var(--wash); font-weight: 700; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
input, select { accent-color: var(--accent); caret-color: var(--accent); max-width: 100%; }
input[type="range"] { width: 100%; min-height: 44px; margin: 0; }
input[type="checkbox"] { width: 20px; height: 20px; flex: 0 0 auto; }
label { display: block; font-weight: 600; }
.check { display: flex; gap: var(--s2); align-items: center; min-height: 44px; font-weight: 400; }
h1, h2, p { margin-top: 0; }
h2 { font-size: 19px; line-height: 1.5; }
.sr-only, .skip-link:not(:focus) { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip-link:focus { position: fixed; top: var(--s3); left: var(--s3); z-index: 10; padding: var(--s3); background: var(--paper); }
#library { position: fixed; inset: 0 auto 0 0; width: 304px; padding: var(--s8) var(--s6); background: var(--rail); border-right: 1px solid var(--rule); overflow-y: auto; }
.library-heading { display: flex; justify-content: space-between; align-items: center; gap: var(--s3); margin-bottom: var(--s8); }
.brand { font: 700 26px/1.3 var(--serif); text-decoration: none; }
.brand span { display: block; margin-top: var(--s2); font: 11px/1.5 var(--sans); letter-spacing: .14em; color: var(--muted); }
.library-tools { display: grid; gap: var(--s2); }
.library-tools .check { margin-top: var(--s2); }
.list-heading { display: flex; align-items: baseline; justify-content: space-between; gap: var(--s2); margin-top: var(--s8); }
.list-heading h2 { margin-bottom: var(--s3); }
#lecture-count, .metadata, .editorial, .library-note, #library-status { color: var(--muted); font-size: 14px; }
ol { list-style: none; margin: 0; padding: 0; }
#lecture-list { display: grid; gap: var(--s2); }
.lecture-link { display: block; width: 100%; padding: var(--s3); text-align: left; background: transparent; border: 0; line-height: 1.6; overflow-wrap: anywhere; }
.lecture-link strong { display: block; font-weight: 500; }
.lecture-link small { display: block; color: var(--muted); margin-top: var(--s1); }
.lecture-link[aria-current="page"] { background: var(--wash); }
.lecture-link[aria-current="page"] strong { font-weight: 700; }
#toc-nav { margin-top: var(--s8); padding-top: var(--s6); border-top: 1px solid var(--rule); }
#toc a { display: block; min-height: 44px; padding: var(--s2); text-decoration: none; overflow-wrap: anywhere; }
#toc a[aria-current="location"] { background: var(--wash); font-weight: 700; }
.library-note { margin: var(--s8) 0 0; }
.reading-shell { margin-left: 304px; min-width: 0; }
.toolbar { position: sticky; top: 0; z-index: 2; display: flex; justify-content: space-between; gap: var(--s3); padding: var(--s3) var(--s8); background: var(--paper); border-bottom: 1px solid var(--rule); }
.toolbar-group { display: flex; align-items: center; gap: var(--s2); min-width: 0; }
#toolbar-title { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--muted); font-size: 13px; max-width: 22ch; }
#open-navigation, .mobile-only { display: none; }
#reader { max-width: calc(var(--measure) + 96px); margin-inline: auto; padding: var(--s16) var(--s12) 112px; font-size: var(--size); min-height: 80dvh; }
.book-heading { margin-bottom: var(--s12); }
h1 { font: 600 clamp(28px, 3vw, 44px)/1.45 var(--serif); letter-spacing: -.025em; word-break: keep-all; overflow-wrap: anywhere; margin-bottom: var(--s6); }
.metadata { margin-bottom: var(--s4); }
.editorial { display: flex; flex-wrap: wrap; gap: var(--s2); }
#editorial-status { color: var(--ink); word-break: keep-all; overflow-wrap: anywhere; }
.reading-actions { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--s3); margin-top: var(--s8); font-size: 14px; }
.text-modes { display: flex; gap: var(--s2); }
#mode-note { margin-top: var(--s3); }
#bookmark-actions { display: flex; flex-wrap: wrap; gap: var(--s2); font-size: 14px; }
.prose { font-family: var(--reading-font); line-height: var(--leading); word-break: keep-all; overflow-wrap: anywhere; }
.prose p { margin: 0 0 1.5em; white-space: pre-wrap; }
.prose h2 { font: 700 1.3em/1.6 var(--reading-font); margin: 3em 0 1.5em; scroll-margin-top: 100px; }
.prose section:first-child h2 { margin-top: 0; }
.original-text { white-space: pre-wrap; margin: 0; font: inherit; }
.book-end { text-align: center; color: var(--muted); font-size: 14px; margin-top: var(--s16); padding-top: var(--s8); border-top: 1px solid var(--rule); }
.book-end a { display: inline-flex; align-items: center; min-height: 44px; }
.pagination { display: flex; align-items: center; justify-content: space-between; gap: var(--s3); margin-top: var(--s12); font-size: 14px; }
#lecture-index, #lecture-count, output { font-variant-numeric: tabular-nums; }
.reading-progress { position: fixed; bottom: 0; left: 304px; right: 0; display: flex; align-items: center; gap: var(--s3); padding: var(--s3) var(--s8) max(var(--s3), env(safe-area-inset-bottom)); background: var(--paper); border-top: 1px solid var(--rule); font-size: 12px; z-index: 2; }
.reading-progress label { font-weight: 400; white-space: nowrap; }
.reading-progress button { white-space: nowrap; flex-shrink: 0; font-size: 13px; }
progress { width: 100%; height: 4px; border: 0; background: var(--rail); accent-color: var(--accent); }
progress::-webkit-progress-bar { background: var(--rail); }
progress::-webkit-progress-value { background: var(--accent); }
progress::-moz-progress-bar { background: var(--accent); }
.reading-state { margin-block: var(--s16); font-size: 18px; line-height: 1.8; }
.notice { padding: var(--s4) var(--s8); margin: 0; background: var(--wash); font-size: 14px; }
dialog { max-height: calc(100dvh - 32px); width: min(480px, calc(100% - 32px)); border: 1px solid var(--rule); border-radius: 8px; background: var(--paper); color: var(--ink); padding: var(--s8); }
dialog::backdrop { background: rgb(0 0 0 / .5); }
body:has(dialog[open]) { overflow: hidden; }
.dialog-heading { display: flex; align-items: center; justify-content: space-between; gap: var(--s4); margin-bottom: var(--s4); }
.dialog-heading h2 { margin: 0; font-size: 24px; }
#settings-dialog form > label:not(.check) { margin-top: var(--s6); margin-bottom: var(--s2); }
#settings-dialog select { width: 100%; }
#settings-dialog output { float: right; color: var(--muted); font-weight: 400; }
#settings-dialog .check { margin-block: var(--s6); }
body.focus-mode .reading-shell { margin-left: 0; }
body.focus-mode #desktop-library { display: none; }
body.focus-mode .reading-progress { left: 0; }
body.focus-mode #open-navigation { display: inline-block; }
#mobile-library #library { position: static; width: auto; border: 0; overflow: visible; padding: var(--s6); }
#mobile-library .mobile-only { display: inline-block; }
#mobile-library .library-heading { position: sticky; top: 0; z-index: 1; background: var(--rail); padding-block: var(--s2); }
@media (max-width: 899px) {
  #desktop-library { display: none; }
  .reading-shell { margin-left: 0; }
  .toolbar { padding: var(--s2) var(--s4); flex-wrap: wrap; }
  #toolbar-title { display: none; }
  #open-navigation, .mobile-only { display: inline-block; }
  #reader { padding: var(--s8) var(--s6) 100px; }
  .reading-progress { left: 0; padding-inline: var(--s4); }
  #navigation-dialog { padding: 0; width: min(400px, calc(100% - 24px)); }
}
@media (max-width: 380px) {
  .toolbar { gap: var(--s2); }
  .toolbar-group { gap: var(--s1); }
  .toolbar button { padding-inline: var(--s2); font-size: 13px; }
  #reader { padding-inline: var(--s4); }
}
@media print {
  #desktop-library, .toolbar, .reading-progress, .reading-actions, .pagination, dialog, .book-end, #bookmark-actions { display: none !important; }
  .reading-shell { margin: 0; }
  #reader { max-width: none; padding: 0; }
}