:root {
  color-scheme: light;
  --ink: #152b31;
  --ink-soft: #455b60;
  --paper: #f5f0e4;
  --paper-deep: #e9e0cd;
  --surface: #fffdf6;
  --line: #d9cfba;
  --line-strong: #bcae92;
  --cinnabar: #9f3328;
  --cinnabar-dark: #7f251e;
  --jade: #2f6262;
  --sidebar: #172f36;
  --sidebar-soft: #21424a;
  --shadow: 0 22px 55px rgba(37, 43, 37, 0.12);
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
}

button, input, select { font: inherit; }

button, a { -webkit-tap-highlight-color: transparent; }

button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible {
  outline: 3px solid rgba(159, 51, 40, 0.32);
  outline-offset: 2px;
}

.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;
}

.skip-link {
  position: fixed;
  z-index: 100;
  left: 1rem;
  top: -5rem;
  padding: 0.7rem 1rem;
  color: white;
  background: var(--cinnabar);
  border-radius: 4px;
}

.skip-link:focus { top: 1rem; }

.topbar {
  position: sticky;
  z-index: 30;
  top: 0;
  height: 84px;
  display: grid;
  grid-template-columns: minmax(230px, 0.8fr) minmax(360px, 1.7fr) auto;
  gap: clamp(1rem, 3vw, 3rem);
  align-items: center;
  padding: 0 2rem;
  background: rgba(255, 253, 246, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand-block { display: flex; align-items: center; gap: 0.85rem; min-width: 0; }

.seal {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  display: grid;
  place-items: center;
  color: #fff8e8;
  background: var(--cinnabar);
  border: 2px solid var(--cinnabar-dark);
  border-radius: 7px 11px 8px 10px;
  font: 1.45rem/1 var(--serif);
  box-shadow: inset 0 0 0 3px rgba(255, 248, 232, 0.22);
}

.brand-block h1 { margin: 0; font: 700 1.35rem/1.2 var(--serif); letter-spacing: 0.08em; }
.brand-block p { margin: 0.25rem 0 0; color: var(--ink-soft); font-size: 0.75rem; letter-spacing: 0.14em; }

.search-form {
  height: 48px;
  display: grid;
  grid-template-columns: 30px 1fr auto auto;
  align-items: center;
  padding-left: 0.55rem;
  background: #f1ecdf;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.search-form:focus-within { border-color: var(--jade); box-shadow: 0 0 0 3px rgba(47, 98, 98, 0.12); }

.search-icon {
  width: 15px;
  height: 15px;
  border: 2px solid var(--ink-soft);
  border-radius: 50%;
  position: relative;
  opacity: 0.8;
}

.search-icon::after {
  content: "";
  position: absolute;
  width: 7px;
  height: 2px;
  right: -6px;
  bottom: -3px;
  background: var(--ink-soft);
  transform: rotate(45deg);
  border-radius: 2px;
}

.search-form input {
  min-width: 0;
  height: 100%;
  padding: 0 0.8rem;
  color: var(--ink);
  background: transparent;
  border: 0;
  font-size: 1rem;
}

.search-form input:focus, .search-form select:focus { outline: 0; }

.search-form select {
  height: 28px;
  max-width: 112px;
  padding: 0 1.8rem 0 0.7rem;
  color: var(--ink-soft);
  background: transparent;
  border: 0;
  border-left: 1px solid var(--line);
  font-size: 0.85rem;
}

.search-form button {
  align-self: stretch;
  padding: 0 1.25rem;
  color: white;
  background: var(--jade);
  border: 0;
  cursor: pointer;
  font-weight: 650;
}

.search-form button:hover { background: #254f50; }

.about-button, .quiet-button {
  min-height: 40px;
  padding: 0.55rem 0.85rem;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  cursor: pointer;
}

.about-button:hover, .quiet-button:hover { color: var(--cinnabar); border-color: var(--cinnabar); }

.mobile-menu { display: none; }

.app-shell { min-height: calc(100vh - 84px); display: grid; grid-template-columns: 310px minmax(0, 1fr); }

.sidebar {
  position: sticky;
  top: 84px;
  height: calc(100vh - 84px);
  display: flex;
  flex-direction: column;
  color: #eef3eb;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.025), transparent 30%),
    var(--sidebar);
  border-right: 1px solid rgba(0, 0, 0, 0.24);
  overflow: hidden;
}

.sidebar-heading, .volume-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.35rem 0.7rem;
  color: #9eb4b6;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
}

.book-list { padding: 0 0.8rem 1rem; border-bottom: 1px solid rgba(255,255,255,0.09); }

.book-group-label {
  padding: 0.95rem 0.8rem 0.35rem;
  color: #80999b;
  font: 0.7rem/1.2 var(--serif);
  letter-spacing: 0.1em;
}

.book-group-label:first-child { padding-top: 0.2rem; }

.book-button {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.6rem;
  align-items: center;
  padding: 0.7rem 0.8rem;
  color: #dbe5df;
  background: transparent;
  border: 0;
  border-radius: 6px;
  text-align: left;
  cursor: pointer;
}

.book-button:hover { background: rgba(255,255,255,0.06); }
.book-button.active { color: white; background: var(--sidebar-soft); box-shadow: inset 3px 0 0 #c76854; }
.book-name { font: 650 1rem/1.2 var(--serif); letter-spacing: 0.08em; }
.book-count { color: #91a9aa; font-size: 0.74rem; }

.chapter-list { flex: 1; padding: 0 0.75rem 1.5rem; overflow-y: auto; scrollbar-color: #42636a transparent; }

.chapter-button {
  width: 100%;
  display: block;
  padding: 0.65rem 0.75rem;
  color: #c7d5d2;
  background: transparent;
  border: 0;
  border-radius: 5px;
  text-align: left;
  cursor: pointer;
}

.chapter-button:hover { color: white; background: rgba(255,255,255,0.055); }
.chapter-button.active { color: #fff7e9; background: rgba(199,104,84,0.18); }
.chapter-button strong { display: block; font: 600 0.95rem/1.35 var(--serif); }
.chapter-button span { display: block; margin-top: 0.16rem; color: #90a6a7; font-size: 0.75rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chapter-button.active span { color: #c7d4d1; }

.source-status {
  display: flex;
  gap: 0.7rem;
  align-items: center;
  padding: 1rem 1.25rem;
  background: rgba(0,0,0,0.14);
  border-top: 1px solid rgba(255,255,255,0.06);
}

.status-mark { width: 8px; height: 8px; flex: 0 0 8px; border-radius: 50%; background: #d4b067; box-shadow: 0 0 0 4px rgba(212,176,103,0.12); }
.source-status strong, .source-status span { display: block; }
.source-status strong { font-size: 0.8rem; font-weight: 600; }
.source-status span { margin-top: 0.15rem; color: #91a7a8; font-size: 0.72rem; }

.main-content {
  min-width: 0;
  background:
    linear-gradient(rgba(68, 75, 59, 0.025) 1px, transparent 1px),
    var(--paper);
  background-size: 100% 32px;
}

.reader-view, .search-view { max-width: 1040px; min-height: calc(100vh - 84px); margin: 0 auto; padding: clamp(2rem, 5vw, 4.8rem) clamp(1.5rem, 6vw, 5.4rem); }

.reader-header { padding-bottom: 2rem; border-bottom: 1px solid var(--line-strong); }
.eyebrow { color: var(--cinnabar); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; }

.reader-title-row { display: flex; gap: 2rem; align-items: flex-start; justify-content: space-between; margin-top: 0.7rem; }
.reader-title-row h2, .search-header h2 { margin: 0; font: 700 clamp(2rem, 4vw, 3.25rem)/1.15 var(--serif); letter-spacing: 0.04em; }
.reader-title-row p { margin: 0.6rem 0 0; color: var(--ink-soft); font-family: var(--serif); font-size: 1.05rem; }
.reader-actions { display: flex; flex: 0 0 auto; gap: 0.65rem; }

.source-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0.55rem 0.9rem;
  color: white;
  background: var(--cinnabar);
  border: 1px solid var(--cinnabar);
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.9rem;
}

.source-link:hover { background: var(--cinnabar-dark); }
.source-link span { margin-left: 0.35rem; }

.topic-list { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 1.2rem; }
.topic-chip { padding: 0.28rem 0.58rem; color: #36595b; background: rgba(47,98,98,0.08); border: 1px solid rgba(47,98,98,0.18); border-radius: 999px; font-size: 0.78rem; }
.ocr-note { margin: 1.3rem 0 0; padding: 0.8rem 1rem; color: #695f50; background: rgba(164,135,75,0.08); border-left: 3px solid #ae945f; font-size: 0.85rem; line-height: 1.7; }

.original-text { padding: 2.2rem 0 1rem; }
.text-heading { margin: 2rem 0 0.7rem 2.85rem; color: var(--cinnabar-dark); font: 700 1.15rem/1.5 var(--serif); letter-spacing: 0.06em; scroll-margin-top: 110px; }
.text-paragraph { position: relative; margin: 0; padding: 0.6rem 0 0.9rem 2.85rem; font: 400 1.12rem/2.08 var(--serif); letter-spacing: 0.025em; text-align: justify; scroll-margin-top: 110px; }
.text-paragraph::before { content: attr(data-paragraph); position: absolute; top: 0.95rem; left: 0; width: 2rem; color: #a39781; font: 0.68rem/1 var(--sans); text-align: right; }
.text-paragraph.targeted { margin-left: -0.8rem; margin-right: -0.8rem; padding-left: 3.65rem; padding-right: 0.8rem; background: rgba(159,51,40,0.07); border-radius: 4px; }
.figure-block { margin: 1.6rem 0 2rem 2.85rem; padding: 1rem; background: #e9e2d3; border: 1px solid var(--line); border-radius: 4px; }
.figure-block img { display: block; max-width: 100%; height: auto; margin: auto; mix-blend-mode: multiply; }
.figure-block figcaption { margin-top: 0.7rem; color: var(--ink-soft); font-size: 0.8rem; text-align: center; }
.missing-glyph { color: #7e493f; background: rgba(159,51,40,0.08); border-bottom: 1px dotted var(--cinnabar); }
mark { padding: 0.05em 0.08em; color: inherit; background: #f0ce72; border-radius: 2px; }

.source-gallery { margin: 2.3rem 0 1rem 2.85rem; padding: 1rem 1.1rem; background: rgba(255,255,255,0.38); border: 1px solid var(--line); border-radius: 7px; }
.source-gallery summary { color: var(--jade); cursor: pointer; font-weight: 700; }
.source-pages { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 1rem; }
.source-page { display: block; padding: 0.65rem; color: var(--ink-soft); background: var(--surface); border: 1px solid var(--line); border-radius: 5px; text-decoration: none; }
.source-page:hover { color: var(--cinnabar); border-color: var(--cinnabar); }
.source-page img { display: block; width: 100%; height: auto; background: white; }
.source-page span { display: block; margin-top: 0.55rem; font-size: 0.78rem; text-align: center; }

.reader-pagination { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 2.6rem; padding-top: 1.6rem; border-top: 1px solid var(--line); }
.reader-pagination button { min-height: 62px; padding: 0.75rem 1rem; color: var(--ink); background: rgba(255,255,255,0.42); border: 1px solid var(--line); border-radius: 6px; cursor: pointer; }
.reader-pagination button:hover:not(:disabled) { color: var(--cinnabar); border-color: var(--cinnabar); }
.reader-pagination button:disabled { opacity: 0.42; cursor: default; }

.search-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 2rem; padding-bottom: 1.8rem; border-bottom: 1px solid var(--line-strong); }
.search-header h2 { margin-top: 0.65rem; font-size: clamp(1.7rem, 3.5vw, 2.7rem); }
.search-header p { margin: 0.7rem 0 0; color: var(--ink-soft); }
.expanded-terms { font-size: 0.82rem; line-height: 1.6; }
.search-results { padding-top: 1.3rem; }

.result-card {
  width: 100%;
  display: block;
  margin: 0;
  padding: 1.25rem 0.2rem 1.35rem;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  cursor: pointer;
}

.result-card:hover h3 { color: var(--cinnabar); }
.result-meta { display: flex; flex-wrap: wrap; gap: 0.55rem; align-items: center; color: var(--jade); font-size: 0.76rem; font-weight: 650; letter-spacing: 0.05em; }
.result-meta span + span::before { content: "/"; margin-right: 0.55rem; color: var(--line-strong); }
.result-card h3 { margin: 0.45rem 0 0.5rem; font: 650 1.18rem/1.45 var(--serif); }
.result-card p { display: -webkit-box; margin: 0; overflow: hidden; color: #3c4d50; font: 1rem/1.85 var(--serif); -webkit-line-clamp: 3; -webkit-box-orient: vertical; }
.empty-state { padding: 3rem 1.5rem; text-align: center; background: rgba(255,255,255,0.3); border: 1px dashed var(--line-strong); border-radius: 8px; }
.empty-state strong { display: block; font: 650 1.2rem var(--serif); }
.empty-state p { margin: 0.65rem 0 0; color: var(--ink-soft); }

.about-dialog {
  width: min(720px, calc(100vw - 2rem));
  max-height: min(82vh, 760px);
  padding: 2.2rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.about-dialog::backdrop { background: rgba(10, 24, 27, 0.66); backdrop-filter: blur(3px); }
.dialog-close { position: absolute; right: 0.8rem; top: 0.7rem; width: 40px; height: 40px; padding: 0; color: var(--ink-soft); background: transparent; border: 0; cursor: pointer; font-size: 1.8rem; }
.dialog-mark { display: grid; place-items: center; width: 58px; height: 58px; color: var(--cinnabar); border: 2px solid var(--cinnabar); font: 700 1rem var(--serif); letter-spacing: 0.08em; transform: rotate(-2deg); }
.about-dialog h2 { margin: 1.25rem 0 0.7rem; font: 700 1.8rem var(--serif); }
.about-dialog > p { color: var(--ink-soft); line-height: 1.8; }
.division-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; margin-top: 1.4rem; }
.division-item { padding: 0.9rem 1rem; background: var(--paper); border-left: 3px solid var(--jade); }
.division-item strong { display: block; font-family: var(--serif); }
.division-item span { display: block; margin-top: 0.25rem; color: var(--ink-soft); font-size: 0.8rem; }
.dialog-footnote { margin-bottom: 0; padding-top: 1rem; border-top: 1px solid var(--line); font-size: 0.82rem; }

.scrim { position: fixed; z-index: 39; inset: 84px 0 0; background: rgba(8,22,25,0.52); }

@media (max-width: 980px) {
  .topbar { grid-template-columns: auto minmax(0, 1fr) auto; gap: 0.75rem; padding: 0 1rem; }
  .brand-block p, .about-button { display: none; }
  .brand-block h1 { font-size: 1.05rem; }
  .seal { display: none; }
  .mobile-menu { width: 42px; height: 42px; display: grid; place-content: center; gap: 4px; padding: 0; color: var(--ink); background: transparent; border: 1px solid var(--line); border-radius: 6px; }
  .mobile-menu span { display: block; width: 18px; height: 2px; background: currentColor; }
  .app-shell { display: block; }
  .sidebar { position: fixed; z-index: 40; top: 84px; left: 0; width: min(330px, 88vw); transform: translateX(-102%); transition: transform 180ms ease; box-shadow: var(--shadow); }
  .sidebar.open { transform: translateX(0); }
}

@media (max-width: 720px) {
  .topbar { height: auto; min-height: 72px; grid-template-columns: auto 1fr auto; padding-top: 0.55rem; padding-bottom: 0.55rem; }
  .brand-block { grid-column: 2; }
  .search-form { grid-column: 1 / -1; grid-row: 2; height: 46px; }
  .search-form select { max-width: 94px; }
  .app-shell { min-height: calc(100vh - 128px); }
  .sidebar { top: 128px; height: calc(100vh - 128px); }
  .scrim { inset: 128px 0 0; }
  .reader-view, .search-view { padding: 2rem 1rem 3.5rem; }
  .reader-title-row { display: block; }
  .reader-actions { margin-top: 1.2rem; flex-wrap: wrap; }
  .reader-actions > * { flex: 1 1 auto; justify-content: center; text-align: center; }
  .text-paragraph { padding-left: 2.2rem; font-size: 1.06rem; line-height: 1.95; }
  .text-heading { margin-left: 2.2rem; }
  .text-paragraph::before { width: 1.45rem; }
  .text-paragraph.targeted { padding-left: 3rem; }
  .figure-block { margin-left: 2.2rem; }
  .source-gallery { margin-left: 2.2rem; }
  .source-pages { grid-template-columns: 1fr; }
  .search-header { display: block; }
  .search-header .quiet-button { margin-top: 1.2rem; }
  .division-grid { grid-template-columns: 1fr; }
}

@media (max-width: 470px) {
  .brand-block h1 { letter-spacing: 0.02em; }
  .search-form { grid-template-columns: 28px 1fr auto; }
  .search-form select { display: none; }
  .search-form button { padding: 0 1rem; }
  .reader-pagination { grid-template-columns: 1fr; }
  .about-dialog { padding: 1.4rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}