:root {
  color-scheme: light;
  --bg: #f3f2ef;
  --panel: #fffdf8;
  --panel-strong: #ebe7df;
  --ink: #2c2f33;
  --muted: #6f7175;
  --line: #d2cec5;
  --accent: #eba834;
  --accent-strong: #8a5b08;
  --on-accent: #25272a;
  --danger: #b42318;
  --gold: #eba834;
  --shadow: 0 18px 60px rgba(44, 47, 51, .14);
  --reader-size: 17px;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1f2124;
  --panel: #292b2f;
  --panel-strong: #34363a;
  --ink: #f5f2eb;
  --muted: #b7b4ad;
  --line: #45474d;
  --accent: #eba834;
  --accent-strong: #ffd278;
  --on-accent: #222326;
  --danger: #ff9d8f;
  --gold: #eba834;
  --shadow: 0 18px 60px rgba(0, 0, 0, .3);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background:
    linear-gradient(90deg, rgba(44, 47, 51, .055) 1px, transparent 1px),
    linear-gradient(rgba(235, 168, 52, .08) 1px, transparent 1px),
    var(--bg);
  background-size: 34px 34px;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
}

button,
input {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
}

.library {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  padding: 22px 18px;
  background: color-mix(in srgb, var(--panel) 94%, transparent);
  border-right: 1px solid var(--line);
  box-shadow: var(--shadow);
  z-index: 4;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: block;
  object-fit: contain;
}

.brand strong,
.brand span {
  display: block;
}

.brand strong {
  letter-spacing: .04em;
}

.brand span {
  color: var(--muted);
  font-size: 13px;
}

.search-box {
  display: grid;
  gap: 7px;
  margin-bottom: 15px;
  color: var(--muted);
  font-size: 13px;
}

.search-box input {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
  border-radius: 6px;
  padding: 12px 13px;
  outline: none;
}

.search-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

.section-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 10px;
}

.section-tabs button,
.syllabus-filter button,
.toggle-button,
.icon-button,
.pager button {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 6px;
  cursor: pointer;
}

.section-tabs button {
  padding: 9px 8px;
  font-size: 13px;
}

.section-tabs button[aria-pressed="true"],
.syllabus-filter button[aria-pressed="true"],
.toggle-button[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}

.syllabus-filter {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
  gap: 6px;
  margin-bottom: 14px;
}

.syllabus-filter:empty {
  display: none;
}

.syllabus-filter button {
  padding: 7px 6px;
  font-size: 12px;
}

.document-list {
  display: grid;
  gap: 7px;
}

.doc-group {
  margin-top: 9px;
  padding: 8px 10px 3px;
  color: var(--accent-strong);
  font-family: "Trebuchet MS", Georgia, serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.doc-link {
  width: 100%;
  display: grid;
  gap: 3px;
  text-align: left;
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink);
  padding: 10px;
  border-radius: 6px;
  cursor: pointer;
}

.doc-link:hover,
.doc-link.active {
  border-color: var(--line);
  background: var(--panel-strong);
}

.doc-link strong {
  font-size: 14px;
  line-height: 1.25;
}

.doc-link span {
  color: var(--muted);
  font-size: 12px;
}

.workspace {
  min-width: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 3;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 26px;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.crumbs {
  min-width: 0;
  color: var(--muted);
  font-size: 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.icon-button,
.toggle-button,
.pager button {
  min-height: 38px;
  padding: 8px 11px;
}

.toggle-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

.toggle-track {
  position: relative;
  width: 36px;
  height: 20px;
  flex: 0 0 auto;
  border-radius: 999px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
}

.toggle-track i {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 999px;
  background: var(--muted);
  transition: transform .18s ease, background .18s ease;
}

.toggle-button[aria-pressed="true"] .toggle-track {
  background: color-mix(in srgb, #fff 22%, var(--accent));
  border-color: color-mix(in srgb, #fff 38%, var(--accent));
}

.toggle-button[aria-pressed="true"] .toggle-track i {
  transform: translateX(16px);
  background: #fff;
}

#menuToggle {
  display: none;
}

.reader-layout {
  display: grid;
  grid-template-columns: minmax(0, 920px) 270px;
  gap: 28px;
  align-items: start;
  max-width: 1260px;
  margin: 0 auto;
  padding: 30px 26px 10px;
}

.reader {
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(24px, 4vw, 54px);
  box-shadow: var(--shadow);
  font-size: var(--reader-size);
  line-height: 1.7;
}

.reader h1,
.reader h2,
.reader h3,
.reader h4 {
  font-family: "Trebuchet MS", Georgia, serif;
  line-height: 1.16;
  letter-spacing: 0;
}

.reader h1 {
  font-size: clamp(31px, 4vw, 51px);
  margin: 0 0 20px;
}

.reader h2 {
  margin-top: 42px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 28px;
}

.reader h3 {
  margin-top: 28px;
  font-size: 21px;
}

.reader p,
.reader ul,
.reader ol,
.reader table,
.reader blockquote {
  margin: 0 0 18px;
}

.reader a {
  color: var(--accent-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.reader blockquote {
  border-left: 5px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  padding: 15px 17px;
  border-radius: 0 7px 7px 0;
}

.reader table {
  width: 100%;
  border-collapse: collapse;
  display: block;
  overflow-x: auto;
}

.reader th,
.reader td {
  border: 1px solid var(--line);
  padding: 9px 11px;
  vertical-align: top;
}

.reader th {
  background: var(--panel-strong);
  text-align: left;
}

.reader hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 30px 0;
}

.reader mark {
  background: color-mix(in srgb, var(--gold) 45%, transparent);
  color: inherit;
  padding: 0 2px;
}

.answer-line {
  border-left: 4px solid var(--gold);
  background: color-mix(in srgb, var(--gold) 13%, transparent);
  padding: 8px 12px;
  border-radius: 0 6px 6px 0;
}

.hide-answers .answer-line {
  display: none;
}

.quiz-options {
  display: grid;
  gap: 9px;
  margin: 0 0 20px;
}

.quiz-options button {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  width: 100%;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-strong) 72%, transparent);
  color: var(--ink);
  border-radius: 7px;
  padding: 11px 12px;
  text-align: left;
  cursor: pointer;
}

.quiz-options button:hover:not(:disabled) {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
}

.quiz-options button:disabled {
  cursor: default;
  opacity: 1;
}

.quiz-options span {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: var(--panel);
  border: 1px solid var(--line);
  font-family: "Trebuchet MS", Georgia, serif;
  font-weight: 700;
}

.quiz-options strong {
  font-weight: 400;
  line-height: 1.45;
}

.quiz-options button.is-correct {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 18%, var(--panel));
}

.quiz-options button.is-correct span {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}

.quiz-options button.is-wrong {
  border-color: var(--danger);
  background: color-mix(in srgb, var(--danger) 12%, var(--panel));
}

.quiz-options button.is-wrong span {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}

.quiz-feedback {
  min-height: 28px;
  padding: 8px 11px;
  color: var(--muted);
  font-family: "Trebuchet MS", Georgia, serif;
  font-size: 14px;
}

.inspector {
  position: sticky;
  top: 88px;
  max-height: calc(100vh - 104px);
  overflow: auto;
  color: var(--muted);
  font-size: 14px;
}

.progress {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 12px;
  margin-bottom: 15px;
}

.progress span {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
}

.progress div {
  height: 7px;
  background: var(--panel-strong);
  border-radius: 999px;
  overflow: hidden;
}

.progress i {
  display: block;
  width: 0%;
  height: 100%;
  background: var(--accent);
}

.quiz-score {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 12px;
  margin-bottom: 15px;
}

.quiz-score strong,
.quiz-score span,
.quiz-score small {
  display: block;
}

.quiz-score strong {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.quiz-score span {
  margin-top: 4px;
  color: var(--ink);
  font-family: "Trebuchet MS", Georgia, serif;
  font-size: 28px;
  font-weight: 700;
}

.quiz-score small {
  margin-top: 4px;
  color: var(--muted);
}

.doc-meta,
.pdf-links {
  display: grid;
  gap: 8px;
  margin-bottom: 20px;
}

.meta-pill,
.pdf-links a {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 6px;
  padding: 9px 10px;
  color: var(--ink);
  text-decoration: none;
}

.inspector h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
}

.toc {
  display: grid;
  gap: 6px;
}

.toc a {
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 9px;
}

.toc a:hover {
  color: var(--accent-strong);
  border-left-color: var(--accent);
}

.toc .level-3 {
  padding-left: 20px;
  font-size: 13px;
}

.pager {
  max-width: 1260px;
  margin: 0 auto;
  padding: 10px 26px 34px;
  display: flex;
  justify-content: space-between;
}

.empty-state {
  padding: 28px 12px;
  color: var(--muted);
  text-align: center;
}

body.sidebar-open .library {
  transform: translateX(0);
}

.sidebar-backdrop {
  display: none;
}

@media (max-width: 1080px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .library {
    position: fixed;
    transform: translateX(-105%);
    width: min(88vw, 360px);
    transition: transform .2s ease;
  }

  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    display: block;
    background: rgba(31, 33, 36, .42);
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s ease;
    z-index: 3;
  }

  body.sidebar-open .sidebar-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  .sidebar-close {
    margin-left: auto;
    display: inline-block;
  }

  #menuToggle {
    display: inline-block;
  }

  .reader-layout {
    grid-template-columns: 1fr;
  }

  .inspector {
    position: sticky;
    top: 64px;
    z-index: 2;
    max-height: none;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
    order: -1;
    overflow: visible;
  }

  .inspector .progress,
  .inspector .quiz-score {
    margin-bottom: 0;
    padding: 9px 10px;
    box-shadow: 0 10px 28px rgba(44, 47, 51, .12);
  }

  .inspector .quiz-score[hidden] {
    display: none;
  }

  .inspector .progress span {
    margin-bottom: 5px;
    font-size: 12px;
  }

  .inspector .progress div {
    height: 5px;
  }

  .quiz-score span {
    font-size: 20px;
  }

  .quiz-score small {
    font-size: 12px;
  }

  .doc-meta,
  .inspector h2,
  .toc,
  .pdf-links {
    display: none;
  }
}

@media (min-width: 1081px) {
  .sidebar-close {
    display: none;
  }
}

@media (max-width: 720px) {
  .topbar {
    padding: 10px 12px;
  }

  .toolbar {
    gap: 5px;
  }

  .toggle-button {
    max-width: 160px;
  }

  .reader-layout {
    padding: 18px 10px 8px;
  }

  .reader {
    padding: 22px 16px;
    border-radius: 0;
  }
}

@media print {
  body {
    background: #fff;
  }

  .library,
  .topbar,
  .inspector,
  .pager {
    display: none;
  }

  .app-shell,
  .reader-layout {
    display: block;
    padding: 0;
  }

  .reader {
    border: 0;
    box-shadow: none;
  }
}