:root {
  --bg: #f3f0e7;
  --bg-soft: #faf7ef;
  --ink: #1d201a;
  --ink-soft: #62645a;
  --ink-faint: #83857a;
  --line: rgba(29, 32, 26, 0.12);
  --line-strong: rgba(29, 32, 26, 0.2);
  --accent: #c65e38;
  --accent-deep: #a84a28;
  --accent-soft: #f2e3d9;
  --panel: #20231d;
  --panel-text: #f3efe4;
  --track: #e4ded1;
  --sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: "SFMono-Regular", "Cascadia Mono", "Cascadia Code", "Consolas",
    "Liberation Mono", monospace;
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia,
    "Times New Roman", "Songti SC", serif;
  --max-width: 1240px;
  --reading-width: 800px;
  --ease: cubic-bezier(0.22, 0.8, 0.25, 1);
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 84% -10%, rgba(198, 94, 56, 0.12), transparent 34rem),
    radial-gradient(circle at -8% 78%, rgba(96, 126, 99, 0.07), transparent 30rem),
    var(--bg);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { color: #fff; background: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
a { color: inherit; }
img { max-width: 100%; }
button { font: inherit; color: inherit; }

.noscript-note {
  margin: 24px 0 0;
  padding: 12px 14px;
  color: var(--ink-soft);
  background: rgba(198, 94, 56, 0.06);
  border-left: 2px solid var(--accent);
  font-size: 12px;
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.page {
  width: min(calc(100% - 64px), var(--max-width));
  margin: 0 auto;
  padding-bottom: 34px;
}

/* Header */
.topbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  justify-self: start;
  gap: 12px;
  min-width: 0;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: block;
  flex: 0 0 auto;
  width: 27px;
  height: 20px;
  overflow: hidden;
  border-radius: 1px;
  background: var(--ink);
}

.brand-mark::after {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 8px;
  content: "";
  background: var(--accent);
}

.brand-copy {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}

.brand-copy b {
  overflow: hidden;
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.14em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.brand-copy small {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-self: center;
  gap: 20px;
}

.site-nav a {
  position: relative;
  padding: 4px 0;
  color: var(--ink-faint);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-nav a:hover { color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }

.site-nav a[aria-current="page"]::after {
  position: absolute;
  right: 0;
  bottom: -2px;
  left: 0;
  height: 1px;
  content: "";
  background: var(--accent);
}

.nav-short { display: none; }

.topbar-status {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: 16px;
  flex: 0 0 auto;
}

.today {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 10px;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.32);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.chip-dot {
  width: 5px;
  height: 5px;
  flex: 0 0 auto;
  background: var(--accent);
  border-radius: 50%;
}

/* Chapter rail */
.section-rail {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(248, 245, 237, 0.94);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 14px 28px -30px rgba(22, 25, 19, 0.55);
}

.rail-inner {
  display: flex;
  align-items: center;
  min-height: 44px;
  gap: 14px;
}

.rail-title {
  flex: 0 0 auto;
  padding-right: 15px;
  color: var(--ink-faint);
  border-right: 1px solid var(--line-strong);
  font-family: var(--mono);
  font-size: 8px;
  line-height: 1.5;
  letter-spacing: 0.07em;
  white-space: nowrap;
}

.rail-nav {
  display: flex;
  flex: 1 1 auto;
  min-width: 0;
  align-self: stretch;
  align-items: stretch;
  gap: 3px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  padding-right: 18px;
  -webkit-mask-image: linear-gradient(to right, #000 calc(100% - 18px), transparent 100%);
  mask-image: linear-gradient(to right, #000 calc(100% - 18px), transparent 100%);
}

.rail-nav::-webkit-scrollbar { display: none; }

.rail-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 6px;
  height: 44px;
  padding: 0 8px;
  color: var(--ink-faint);
  font-size: 11px;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.rail-link:hover { color: var(--ink); }
.rail-link.is-active { color: var(--ink); font-weight: 600; }

.rail-link::after {
  position: absolute;
  right: 8px;
  bottom: 0;
  left: 8px;
  height: 2px;
  content: "";
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s var(--ease);
}

.rail-link.is-active::after { transform: scaleX(1); }

.rail-code {
  color: #9a9c90;
  font-family: var(--mono);
  font-size: 7.5px;
  font-weight: 400;
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
}

.rail-link.is-active .rail-code { color: var(--accent); }

.rail-end {
  flex: 0 0 auto;
  padding-left: 12px;
  color: var(--ink-faint);
  border-left: 1px solid var(--line-strong);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

/* Overview hero */
.notes-hero {
  padding: clamp(46px, 6.4vw, 82px) 0 0;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 292px;
  align-items: start;
  gap: clamp(40px, 6vw, 78px);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 17px;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 24px;
  height: 1px;
  flex: 0 0 auto;
  content: "";
  background: var(--accent);
}

.notes-hero h1 {
  max-width: 840px;
  margin: 0;
  color: var(--ink);
  font-size: clamp(42px, 6.1vw, 82px);
  font-weight: 650;
  line-height: 1.05;
  letter-spacing: -0.06em;
}

.notes-hero h1 em {
  color: var(--accent);
  font-family: var(--serif);
  font-style: normal;
  font-weight: 400;
}

.hero-deck {
  max-width: 660px;
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-size: 13.5px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px 25px;
  margin-top: 28px;
}

.read-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 4px;
  color: var(--accent-deep);
  border-bottom: 1px solid rgba(198, 94, 56, 0.45);
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.read-link svg { width: 12px; height: 12px; transition: transform 0.25s var(--ease); }
.read-link:hover { color: var(--accent); border-color: var(--accent); }
.read-link:hover svg { transform: translateY(2px); }

.plain-link {
  color: var(--ink-faint);
  font-size: 11px;
  text-decoration: none;
  transition: color 0.2s ease;
}

.plain-link:hover { color: var(--ink); }

.hero-facts {
  padding-top: 2px;
  border-top: 1px solid var(--line-strong);
}

.fact {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.fact span {
  display: block;
  margin-bottom: 4px;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.08em;
}

.fact p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 11px;
  line-height: 1.75;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: clamp(38px, 5vw, 56px);
  border-top: 1px solid var(--line-strong);
}

.hero-stat {
  padding: 16px 22px 18px 0;
  border-right: 1px solid var(--line);
}

.hero-stat:last-child { border-right: 0; }

.hero-stat strong {
  display: block;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.hero-stat span {
  display: block;
  margin-top: 5px;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.05em;
}

/* Shared prose */
.overview-body {
  padding-top: clamp(36px, 5vw, 58px);
}

.prose {
  color: var(--ink);
  font-size: 14.8px;
  line-height: 1.92;
}

.prose > *:first-child { margin-top: 0; }

.prose h2 {
  position: relative;
  margin: 46px 0 18px;
  padding-top: 16px;
  color: var(--ink);
  border-top: 1px solid var(--line-strong);
  font-size: 19px;
  font-weight: 650;
  line-height: 1.35;
  letter-spacing: -0.015em;
  scroll-margin-top: 78px;
}

.prose h3 {
  margin: 34px 0 12px;
  color: var(--ink);
  font-size: 16.5px;
  font-weight: 650;
  line-height: 1.5;
  letter-spacing: -0.01em;
  scroll-margin-top: 78px;
}

.prose p { margin: 0 0 1.02em; }
.prose strong { color: var(--ink); font-weight: 650; }

.prose a {
  color: var(--accent-deep);
  text-decoration-color: rgba(198, 94, 56, 0.38);
  text-underline-offset: 3px;
}

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

.prose ul, .prose ol { margin: 0 0 1.1em; padding-left: 1.28em; }
.prose li { margin: 5px 0; padding-left: 2px; }
.prose li > ul, .prose li > ol { margin: 7px 0 7px; }
.prose li::marker { color: #9c9e92; }
.prose li > p { margin-bottom: 0.5em; }

.prose hr {
  height: 0;
  margin: 36px 0;
  border: 0;
  border-top: 1px solid var(--line-strong);
}

.dot-sep {
  height: 1px;
  margin: 22px 0;
  border-top: 1px dotted rgba(29, 32, 26, 0.22);
}

.prose blockquote {
  margin: 20px 0;
  padding: 12px 16px;
  color: var(--ink-soft);
  background: rgba(198, 94, 56, 0.055);
  border-left: 2px solid rgba(198, 94, 56, 0.55);
  font-size: 13.6px;
  line-height: 1.85;
}

.prose blockquote p { margin: 0 0 0.6em; }
.prose blockquote p:last-child { margin-bottom: 0; }

.prose code {
  padding: 1px 4px;
  color: #7a3a22;
  background: rgba(29, 32, 26, 0.065);
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 0.88em;
  word-break: break-word;
}

.prose pre {
  margin: 20px 0 24px;
  padding: 15px 17px;
  overflow-x: auto;
  color: #ece8dd;
  background: #24271f;
  border-radius: 2px;
  font-size: 12px;
  line-height: 1.72;
  tab-size: 4;
  -webkit-overflow-scrolling: touch;
}

.prose pre code {
  padding: 0;
  color: inherit;
  background: none;
  border-radius: 0;
  font-size: inherit;
  word-break: normal;
}

.table-scroll-hint { display: none; }

.table-wrap {
  margin: 19px 0 26px;
  overflow-x: auto;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
}

.prose table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 12.4px;
  line-height: 1.68;
}

.prose th {
  padding: 9px 12px;
  color: var(--ink-soft);
  background: rgba(214, 205, 189, 0.28);
  border-bottom: 1px solid var(--line-strong);
  font-weight: 650;
  text-align: left;
  white-space: nowrap;
}

.prose td {
  padding: 9px 12px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.prose tr:last-child td { border-bottom: 0; }
.prose td code, .prose th code { white-space: nowrap; }
.prose table.route-table th:nth-child(2),
.prose table.route-table td:nth-child(2) { width: 76px; white-space: nowrap; }

/* Annotation lines */
.prose li.tag-line {
  margin: 12px 0 10px;
  padding: 6px 9px;
  color: var(--ink-soft);
  background: rgba(198, 94, 56, 0.055);
  border-radius: 2px;
  font-size: 11.5px;
  line-height: 1.72;
  list-style: none;
}

.prose li.tag-line strong {
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.prose li.key-line, .prose li.warn-line {
  margin: 7px 0;
  color: var(--ink-soft);
}

.prose li.key-line strong, .prose li.warn-line strong {
  color: var(--accent-deep);
  font-weight: 650;
}

/* Figures */
.note-figure {
  margin: 24px 0 28px;
}

.fig-btn {
  display: block;
  width: 100%;
  padding: 0;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 2px;
  cursor: zoom-in;
}

.fig-btn img {
  display: block;
  width: 100%;
  height: auto;
  transition: opacity 0.2s ease;
}

.fig-btn:hover img { opacity: 0.94; }

.note-figure figcaption {
  margin-top: 8px;
  padding-left: 1px;
  color: var(--ink-faint);
  font-size: 11px;
  line-height: 1.72;
}

/* Overview layout */
.overview-prose { max-width: 860px; }

.chapter-index {
  margin-top: clamp(54px, 7vw, 78px);
  scroll-margin-top: 72px;
}

.chapter-index-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 0 0;
  border-top: 1px solid var(--line-strong);
}

.chapter-index-head h2 {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 19px;
  font-weight: 650;
  letter-spacing: -0.015em;
}

.chapter-index-head span {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.06em;
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 42px;
  margin-top: 8px;
}

.module {
  padding: 17px 0 24px;
  border-top: 1px solid var(--line);
}

.module-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.module-head h3 {
  margin: 0;
  color: var(--ink);
  font-size: 13px;
  font-weight: 650;
  line-height: 1.4;
}

.module-head span {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.module-links { display: grid; }

.module-link {
  display: grid;
  grid-template-columns: 47px minmax(0, 1fr);
  gap: 8px;
  padding: 6px 0;
  color: var(--ink-soft);
  border-bottom: 1px solid rgba(29, 32, 26, 0.075);
  font-size: 12px;
  line-height: 1.55;
  text-decoration: none;
  transition: color 0.18s ease, padding-left 0.2s var(--ease);
}

.module-link:last-child { border-bottom: 0; }
.module-link:hover { color: var(--accent-deep); padding-left: 3px; }

.module-code {
  color: #9a9c90;
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.02em;
  padding-top: 3px;
}

.module-link:hover .module-code { color: var(--accent); }

/* Chapter view */
.chapter-head {
  max-width: var(--reading-width);
  margin: 0 auto;
  padding: clamp(38px, 5vw, 62px) 0 24px;
  border-bottom: 1px solid var(--line);
}

.chapter-head h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(30px, 4.4vw, 47px);
  font-weight: 650;
  line-height: 1.16;
  letter-spacing: -0.038em;
  overflow-wrap: anywhere;
}

.chapter-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px 20px;
  margin-top: 17px;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.04em;
}

.chapter-meta span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.chapter-meta span::before {
  width: 3px;
  height: 3px;
  content: "";
  background: var(--accent);
}

.chapter-outline {
  max-width: var(--reading-width);
  margin: 22px auto 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.chapter-outline summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 11px 0;
  color: var(--ink-soft);
  cursor: pointer;
  list-style: none;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
}

.chapter-outline summary::-webkit-details-marker { display: none; }

.chapter-outline summary::after {
  content: "+";
  color: var(--accent);
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 300;
  line-height: 1;
}

.chapter-outline[open] summary::after { content: "−"; }

.outline-count {
  margin-left: auto;
  color: var(--ink-faint);
  font-size: 8px;
  font-weight: 400;
}

.outline-list {
  columns: 2;
  column-gap: 30px;
  margin: 0;
  padding: 2px 0 16px;
  list-style: none;
}

.outline-list li { margin: 0; break-inside: avoid; }

.outline-list a {
  display: block;
  padding: 4px 0;
  color: var(--ink-faint);
  font-size: 11px;
  line-height: 1.55;
  text-decoration: none;
  transition: color 0.18s ease;
}

.outline-list a:hover { color: var(--accent-deep); }
.outline-list .outline-h3 a { padding-left: 10px; }
.outline-list .outline-h2 a { color: var(--ink-soft); font-weight: 650; }

.outline-code {
  display: inline-block;
  width: 34px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 8.5px;
  font-weight: 400;
  letter-spacing: 0.03em;
}

.notes-article {
  max-width: var(--reading-width);
  margin: 0 auto;
  padding: 12px 0 10px;
}

.notes-article > h1 { display: none; }
.notes-article > h2:first-of-type { margin-top: 30px; }

.chapter-block + .chapter-block { margin-top: 44px; }

.chapter-block-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 18px;
  padding-top: 22px;
  border-top: 1px solid var(--line-strong);
}

.chapter-block:first-child .chapter-block-head {
  padding-top: 0;
  border-top: 0;
}

.chapter-block-code {
  flex: none;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
}

.chapter-block-head h2 {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: clamp(20px, 2.5vw, 26px);
  line-height: 1.35;
  letter-spacing: -0.022em;
  scroll-margin-top: 90px;
}

.chapter-pager {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 18px;
  max-width: var(--reading-width);
  margin: 48px auto 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line-strong);
}

.pager-link {
  display: block;
  max-width: 250px;
  text-decoration: none;
}

.pager-link span {
  display: block;
  margin-bottom: 3px;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.04em;
}

.pager-link strong {
  display: block;
  color: var(--ink);
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.5;
}

.pager-next { justify-self: end; text-align: right; }
.pager-link:hover strong { color: var(--accent-deep); }
.pager-link:hover span { color: var(--accent); }

.pager-home {
  padding: 4px 9px;
  color: var(--ink-faint);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 8px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.pager-home:hover { color: var(--accent-deep); border-color: rgba(198, 94, 56, 0.45); }

/* Footer */
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px 30px;
  margin-top: 56px;
  padding: 22px 0 4px;
  color: var(--ink-faint);
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.02em;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.footer-links a {
  color: var(--ink-faint);
  text-decoration: none;
  transition: color 0.18s ease;
}

.footer-links a:hover { color: var(--accent-deep); }

/* Lightbox */
.figure-dialog {
  width: min(94vw, 1180px);
  max-width: none;
  max-height: 92vh;
  padding: 0;
  overflow: visible;
  background: transparent;
  border: 0;
}

.figure-dialog::backdrop { background: rgba(18, 20, 16, 0.86); backdrop-filter: blur(4px); }

.dialog-shell { position: relative; }

.dialog-image {
  display: block;
  width: 100%;
  max-height: 78vh;
  object-fit: contain;
  background: #fff;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.dialog-bar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 2px 0;
  color: #d8d5c8;
  font-size: 10.5px;
  line-height: 1.65;
}

.dialog-caption { max-width: 86%; }
.dialog-caption a { margin-left: 6px; color: #efb091; text-decoration: none; white-space: nowrap; }
.dialog-caption a:hover { text-decoration: underline; }

.dialog-close {
  flex: 0 0 auto;
  padding: 5px 9px;
  color: #f3efe4;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 9px;
  cursor: pointer;
}

.dialog-close:hover { background: rgba(255, 255, 255, 0.16); }

/* Responsive */
@media (max-width: 1100px) {
  .rail-title { display: none; }
  .rail-end { display: none; }
}

@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr) 250px; gap: 44px; }
  .module-grid { grid-template-columns: 1fr 1fr; gap: 0 34px; }
}

@media (max-width: 820px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .hero-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 0 28px; border-top: 0; }
  .fact { border-top: 1px solid var(--line); }
  .fact:last-child { grid-column: 1 / -1; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .hero-stat:nth-child(2) { border-right: 0; }
  .hero-stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .module-grid { grid-template-columns: 1fr; gap: 0; }
  .site-footer { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 680px) {
  .page { width: min(calc(100% - 40px), var(--max-width)); }

  .topbar {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 14px;
    padding: 16px 0;
  }

  .brand { flex: 0 1 auto; min-width: 0; gap: 9px; }
  .brand-mark { width: 22px; height: 17px; }
  .brand-copy small { display: none; }
  .brand-copy b { font-size: 8.5px; letter-spacing: 0.1em; }

  .site-nav {
    width: auto;
    flex: 0 0 auto;
    gap: 13px;
    margin: 0 0 0 auto;
  }

  .site-nav a { font-size: 10.5px; }
  .nav-full { display: none; }
  .nav-short { display: inline; }

  .topbar-status { display: none; }

  .rail-inner { min-height: 46px; gap: 10px; }
  .rail-link { height: 46px; padding: 0 8px; font-size: 10.5px; }
  .rail-code { font-size: 7px; }
  .rail-nav { padding-right: 10px; -webkit-mask-image: none; mask-image: none; }

  .notes-hero { padding-top: 38px; }
  .notes-hero h1 { font-size: clamp(38px, 12.2vw, 56px); line-height: 1.08; }
  .hero-deck { font-size: 13px; margin-top: 20px; }
  .hero-actions { gap: 14px 20px; margin-top: 23px; }
  .hero-facts { grid-template-columns: 1fr; gap: 0; }
  .fact:last-child { grid-column: auto; }
  .hero-stat { padding-right: 14px; }
  .hero-stat strong { font-size: 26px; }
  .hero-stat span { font-size: 8px; }

  .prose { font-size: 14.5px; line-height: 1.88; }
  .prose h2 { margin-top: 38px; font-size: 18px; }
  .prose h3 { margin-top: 29px; font-size: 15.8px; }
  .prose li.tag-line { margin-left: -8px; padding: 6px 8px; font-size: 11px; }

  .chapter-head { padding-top: 34px; }
  .chapter-head h1 { font-size: clamp(28px, 8.6vw, 38px); line-height: 1.2; }
  .chapter-meta { font-size: 8px; gap: 6px 14px; }

  .chapter-block + .chapter-block { margin-top: 34px; }
  .chapter-block-head { gap: 8px; padding-top: 18px; }
  .chapter-block-head h2 { font-size: 18.5px; line-height: 1.4; }
  .chapter-block-code { font-size: 8px; }

  .outline-list { columns: 1; padding-bottom: 12px; }
  .chapter-outline { margin-top: 18px; }

  .note-figure { margin: 20px 0 24px; }
  .note-figure figcaption { font-size: 10.5px; }
  .table-wrap { box-shadow: inset -14px 0 14px -14px rgba(29, 32, 26, 0.3); }
  .table-scroll-hint {
    display: block;
    margin: 18px 0 -9px;
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 8px;
    letter-spacing: 0.05em;
  }

  .chapter-pager {
    grid-template-columns: 1fr 1fr;
    gap: 14px 18px;
    margin-top: 38px;
  }

  .pager-home {
    grid-column: 1 / -1;
    grid-row: 1;
    justify-self: start;
    order: -1;
  }

  .pager-link { max-width: none; }
  .pager-next { justify-self: end; }

  .site-footer { margin-top: 42px; }

  .figure-dialog { width: 96vw; }
  .dialog-image { max-height: 70vh; }
  .dialog-bar { font-size: 10px; }
  .dialog-caption { max-width: 78%; }
}

@media (max-width: 390px) {
  .brand-copy b { max-width: 108px; }
  .site-nav { gap: 10px; }
  .site-nav a { font-size: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media print {
  body { background: #fff; color: #000; }
  .page { width: 100%; padding: 0; }
  .topbar, .section-rail, .chapter-outline, .chapter-pager, .site-footer,
  .hero-facts, .hero-actions, .figure-dialog, .noscript-note { display: none !important; }
  .notes-hero { padding-top: 0; border: 0; }
  .notes-hero h1 { font-size: 28pt; }
  .chapter-head { padding-top: 0; }
  .prose, .notes-article { max-width: none; font-size: 10.5pt; line-height: 1.65; }
  .notes-article pre { white-space: pre-wrap; color: #111; background: #f2f2f2; border: 1px solid #ccc; }
  .note-figure, .table-wrap, blockquote { break-inside: avoid; }
  a { color: inherit !important; text-decoration: none !important; }
  .notes-view[hidden] { display: none !important; }
}


    /* Pin quick reference */
    .rail-lookup {
      display: inline-flex;
      align-items: center;
      flex: 0 0 auto;
      gap: 6px;
      height: 30px;
      margin-left: 8px;
      padding: 0 12px;
      color: var(--panel-text);
      background: var(--ink);
      border: 1px solid var(--ink);
      border-radius: 999px;
      font-family: var(--mono);
      font-size: 9px;
      letter-spacing: 0.03em;
      white-space: nowrap;
      cursor: pointer;
      transition: background-color 0.2s ease, border-color 0.2s ease;
    }

    .rail-lookup svg { width: 12px; height: 12px; flex: 0 0 auto; }
    .rail-lookup:hover { background: var(--accent-deep); border-color: var(--accent-deep); }
    .rail-lookup:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
    .rail-lookup-short { display: none; }

    .pin-lookup {
      position: fixed;
      inset: 0 0 0 auto;
      display: flex;
      width: min(980px, 100vw);
      max-width: none;
      height: 100vh;
      height: 100dvh;
      max-height: none;
      margin: 0;
      padding: 0;
      overflow: hidden;
      flex-direction: column;
      color: var(--ink);
      background: var(--bg);
      border: 0;
      border-left: 1px solid var(--line-strong);
      box-shadow: -30px 0 80px -40px rgba(18, 20, 16, 0.65);
    }

    .pin-lookup:not([open]) { display: none; }

    .pin-lookup::backdrop {
      background: rgba(18, 20, 16, 0.58);
      -webkit-backdrop-filter: blur(4px);
      backdrop-filter: blur(4px);
    }

    html.pin-lookup-open,
    html.pin-lookup-open body { overflow: hidden; }

    .pin-lookup-head {
      display: flex;
      flex: 0 0 auto;
      align-items: flex-start;
      justify-content: space-between;
      gap: 24px;
      padding: 23px 26px 17px;
      background: var(--bg-soft);
      border-bottom: 1px solid var(--line);
    }

    .pin-lookup-kicker {
      display: flex;
      align-items: center;
      gap: 9px;
      margin: 0 0 9px;
      color: var(--ink-faint);
      font-family: var(--mono);
      font-size: 8px;
      letter-spacing: 0.13em;
      text-transform: uppercase;
    }

    .pin-lookup-kicker::before {
      width: 18px;
      height: 1px;
      content: "";
      background: var(--accent);
    }

    .pin-lookup-head h2 {
      margin: 0;
      font-family: var(--serif);
      font-size: 24px;
      font-weight: 500;
      line-height: 1.1;
      letter-spacing: -0.03em;
    }

    .pin-lookup-deck {
      max-width: 690px;
      margin: 8px 0 0;
      color: var(--ink-faint);
      font-size: 9.5px;
      line-height: 1.65;
    }

    .pin-lookup-close {
      flex: 0 0 auto;
      padding: 7px 10px;
      color: var(--ink-soft);
      background: transparent;
      border: 1px solid var(--line-strong);
      border-radius: 2px;
      font-family: var(--mono);
      font-size: 8px;
      letter-spacing: 0.03em;
      cursor: pointer;
      transition: color 0.18s ease, border-color 0.18s ease;
    }

    .pin-lookup-close:hover { color: var(--accent-deep); border-color: rgba(198, 94, 56, 0.5); }

    .pin-lookup-tools {
      display: grid;
      flex: 0 0 auto;
      grid-template-columns: minmax(0, 1fr) auto;
      align-items: center;
      gap: 14px;
      padding: 13px 26px 11px;
      background: var(--bg-soft);
    }

    .pin-search {
      position: relative;
      display: flex;
      align-items: center;
      min-width: 0;
    }

    .pin-search > svg {
      position: absolute;
      left: 11px;
      width: 13px;
      height: 13px;
      color: var(--ink-faint);
      pointer-events: none;
    }

    .pin-search input {
      width: 100%;
      height: 38px;
      padding: 0 35px 0 33px;
      color: var(--ink);
      background: #fff;
      border: 1px solid var(--line-strong);
      border-radius: 2px;
      font-family: var(--sans);
      font-size: 12px;
      outline: none;
      transition: border-color 0.18s ease, box-shadow 0.18s ease;
    }

    .pin-search input::placeholder { color: #9a9c91; }
    .pin-search input:focus { border-color: rgba(198, 94, 56, 0.55); box-shadow: 0 0 0 3px rgba(198, 94, 56, 0.08); }

    .pin-search-clear {
      position: absolute;
      right: 7px;
      display: grid;
      width: 22px;
      height: 22px;
      place-items: center;
      color: var(--ink-faint);
      background: transparent;
      border: 0;
      border-radius: 50%;
      font-size: 15px;
      line-height: 1;
      cursor: pointer;
    }

    .pin-search-clear:hover { color: var(--ink); background: rgba(29, 32, 26, 0.07); }

    .pin-lookup-count {
      color: var(--ink-faint);
      font-family: var(--mono);
      font-size: 8px;
      letter-spacing: 0.02em;
      white-space: nowrap;
    }

    .pin-tabs {
      display: flex;
      flex: 0 0 auto;
      align-items: stretch;
      gap: 4px;
      padding: 0 26px;
      overflow-x: auto;
      background: var(--bg-soft);
      border-bottom: 1px solid var(--line);
      scrollbar-width: none;
    }

    .pin-tabs::-webkit-scrollbar { display: none; }

    .pin-tab {
      position: relative;
      display: inline-flex;
      align-items: center;
      flex: 0 0 auto;
      gap: 5px;
      height: 38px;
      padding: 0 10px;
      color: var(--ink-faint);
      background: transparent;
      border: 0;
      border-bottom: 2px solid transparent;
      font-family: var(--mono);
      font-size: 9.5px;
      letter-spacing: 0.02em;
      white-space: nowrap;
      cursor: pointer;
      transition: color 0.18s ease, border-color 0.18s ease;
    }

    .pin-tab:hover { color: var(--ink); }
    .pin-tab.is-active { color: var(--ink); border-bottom-color: var(--accent); }
    .pin-tab-count { color: var(--accent-deep); font-size: 7.5px; }
    .pin-tab-count::before { content: "("; }
    .pin-tab-count::after { content: ")"; }
    .pin-tab-count[hidden] { display: none; }

    .pin-lookup-body {
      flex: 1 1 auto;
      min-height: 0;
      padding: 2px 26px 26px;
      overflow-y: auto;
      overscroll-behavior: contain;
      scrollbar-gutter: stable;
    }

    .pin-panel { padding-top: 2px; }
    .pin-panel[hidden] { display: none !important; }

    .pin-block { margin-top: 18px; }
    .pin-block:first-child { margin-top: 14px; }

    .pin-block-title {
      display: flex;
      align-items: center;
      gap: 8px;
      margin: 0 0 7px;
      color: var(--ink-soft);
      font-family: var(--mono);
      font-size: 8px;
      font-weight: 600;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .pin-block-title::before {
      width: 3px;
      height: 3px;
      flex: 0 0 auto;
      content: "";
      background: var(--accent);
    }

    .pin-table-wrap {
      overflow-x: auto;
      background: rgba(255, 255, 255, 0.22);
      border-top: 1px solid var(--line-strong);
      border-bottom: 1px solid var(--line);
      -webkit-overflow-scrolling: touch;
    }

    .pin-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 11px;
      line-height: 1.55;
    }

    .pin-panel[data-pin-panel="pins"] .pin-table { min-width: 610px; }
    .pin-panel[data-pin-panel="comms"] .pin-table { min-width: 760px; }
    .pin-panel[data-pin-panel="timadc"] .pin-table { min-width: 760px; }
    .pin-panel[data-pin-panel="special"] .pin-table { min-width: 570px; }
    .pin-panel[data-pin-panel="api"] .pin-table { min-width: 690px; }

    .pin-table th {
      position: sticky;
      top: 0;
      z-index: 2;
      padding: 8px 9px;
      color: var(--ink-faint);
      background: #f0eadf;
      border-bottom: 1px solid var(--line-strong);
      font-family: var(--mono);
      font-size: 7.5px;
      font-weight: 500;
      letter-spacing: 0.05em;
      text-align: left;
      text-transform: uppercase;
      white-space: nowrap;
    }

    .pin-table td {
      padding: 8px 9px;
      color: var(--ink-soft);
      border-bottom: 1px solid rgba(29, 32, 26, 0.075);
      vertical-align: top;
    }

    .pin-table tbody tr:last-child td { border-bottom: 0; }
    .pin-table tbody tr:hover td { background: rgba(198, 94, 56, 0.045); }

    .pin-num {
      width: 34px;
      color: #9b9d91 !important;
      font-family: var(--mono);
      font-size: 8px;
      white-space: nowrap;
    }

    .pin-name { min-width: 108px; }

    .pin-name-main {
      color: var(--ink);
      font-family: var(--mono);
      font-size: 11px;
      font-weight: 600;
      white-space: nowrap;
    }

    .pin-sub {
      display: block;
      margin-top: 1px;
      color: var(--ink-faint);
      font-family: var(--mono);
      font-size: 7.5px;
      line-height: 1.5;
    }

    .pin-ft-inline {
      display: none;
      margin-left: 4px;
      padding: 1px 3px;
      color: var(--accent-deep);
      border: 1px solid rgba(198, 94, 56, 0.28);
      border-radius: 2px;
      font-family: var(--mono);
      font-size: 6.5px;
      font-weight: 500;
      vertical-align: 1px;
      white-space: nowrap;
    }

    .pin-common {
      display: inline-block;
      margin-left: 4px;
      padding: 1px 3px;
      color: var(--accent-deep);
      background: var(--accent-soft);
      border-radius: 2px;
      font-family: var(--mono);
      font-size: 6.5px;
      font-weight: 500;
      vertical-align: 1px;
      white-space: nowrap;
    }

    .pin-func {
      display: block;
      color: var(--ink);
      font-size: 10.5px;
      line-height: 1.6;
    }

    .pin-remap {
      display: block;
      margin-top: 2px;
      color: var(--ink-soft);
      font-size: 9.5px;
      line-height: 1.55;
    }

    .pin-remap b {
      margin-right: 4px;
      color: var(--accent-deep);
      font-family: var(--mono);
      font-size: 7px;
      font-weight: 500;
      letter-spacing: 0.02em;
    }

    .pin-note {
      display: block;
      margin-top: 2px;
      color: var(--ink-faint);
      font-size: 9px;
      line-height: 1.55;
    }

    .pin-ft {
      width: 40px;
      color: var(--accent-deep) !important;
      font-family: var(--mono);
      font-size: 8px;
      white-space: nowrap;
    }

    .pin-cell { font-size: 10.5px; line-height: 1.65; }
    .pin-cell code, .pin-peripheral {
      font-family: var(--mono);
    }

    .pin-table code {
      color: var(--ink);
      font-size: 9px;
      white-space: normal;
      overflow-wrap: anywhere;
      word-break: break-word;
    }

    .pin-peripheral {
      min-width: 84px;
      color: var(--ink) !important;
      font-size: 10px;
      font-weight: 600;
      white-space: nowrap;
    }

    .pin-empty {
      padding: 28px 0;
      color: var(--ink-faint);
      font-family: var(--mono);
      font-size: 9px;
      text-align: center;
    }

    .pin-scroll-hint {
      display: none;
      margin: 3px 0 6px;
      color: var(--ink-faint);
      font-family: var(--mono);
      font-size: 8px;
      letter-spacing: 0.03em;
    }

    .pin-footnote {
      margin: 12px 0 0;
      color: var(--ink-faint);
      font-size: 8.5px;
      line-height: 1.7;
    }

    @media (max-width: 820px) {
      .pin-lookup { border-left: 0; }
      .pin-lookup-head { padding: 17px 18px 13px; gap: 14px; }
      .pin-lookup-head h2 { font-size: 21px; }
      .pin-lookup-deck { font-size: 8.5px; }
      .pin-lookup-tools { padding: 11px 18px 9px; gap: 10px; }
      .pin-tabs { padding: 0 18px; }
      .pin-lookup-body { padding: 2px 18px 22px; }
      .pin-lookup-count { font-size: 7.5px; }
    }

    @media (max-width: 680px) {
      .rail-lookup {
        height: 28px;
        gap: 5px;
        margin-left: 6px;
        padding: 0 9px;
        font-size: 8.5px;
      }

      .rail-lookup-full { display: inline; }
      .rail-lookup-short { display: none; }

      .pin-lookup-deck { display: none; }
      .pin-lookup-head { align-items: center; }
      .pin-lookup-kicker { margin-bottom: 6px; }
      .pin-lookup-close { padding: 6px 8px; font-size: 7.5px; }
      .pin-search input { height: 36px; font-size: 11.5px; }
      .pin-lookup-tools { grid-template-columns: minmax(0, 1fr) auto; }
      .pin-tab { height: 36px; padding: 0 8px; font-size: 9px; }
      .pin-lookup-body { padding: 0 18px 20px; }
      .pin-table th { padding: 7px 8px; }
      .pin-table td { padding: 7px 8px; }

      .pin-panel[data-pin-panel="pins"] .pin-table { min-width: 0; }
      .pin-panel[data-pin-panel="pins"] .pin-table th:last-child,
      .pin-panel[data-pin-panel="pins"] .pin-table td:last-child { display: none; }
      .pin-panel[data-pin-panel="pins"] .pin-name { min-width: 84px; }
      .pin-panel[data-pin-panel="pins"] .pin-func { font-size: 10px; }
      .pin-panel[data-pin-panel="pins"] .pin-remap { font-size: 9px; }
      .pin-panel[data-pin-panel="pins"] .pin-note { font-size: 8.5px; }
      .pin-panel[data-pin-panel="pins"] .pin-ft-inline { display: inline-block; }
      .pin-scroll-hint { display: block; }
    }

    @media print {
      .rail-lookup, .pin-lookup { display: none !important; }
    }


    /* Document reading / editing toolbar */
    .doc-tools {
      position: sticky;
      top: 45px;
      z-index: 35;
      background: rgba(246, 242, 233, 0.95);
      -webkit-backdrop-filter: blur(14px);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--line);
    }

    .doc-tools-inner {
      display: flex;
      align-items: center;
      min-height: 37px;
      gap: 12px;
    }

    .doc-mode {
      display: inline-flex;
      flex: 0 0 auto;
      gap: 2px;
      padding: 2px;
      background: rgba(29, 32, 26, 0.055);
      border: 1px solid var(--line);
      border-radius: 999px;
    }

    .doc-mode-btn {
      height: 23px;
      padding: 0 10px;
      color: var(--ink-faint);
      background: transparent;
      border: 0;
      border-radius: 999px;
      font-family: var(--mono);
      font-size: 8.5px;
      letter-spacing: 0.03em;
      cursor: pointer;
      transition: color 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
    }

    .doc-mode-btn:hover { color: var(--ink); }

    .doc-mode-btn[aria-pressed="true"] {
      color: var(--ink);
      background: #fff;
      box-shadow: 0 1px 3px rgba(22, 25, 19, 0.12);
      font-weight: 600;
    }

    .doc-save-state {
      min-width: 0;
      overflow: hidden;
      color: var(--ink-faint);
      font-family: var(--mono);
      font-size: 8px;
      letter-spacing: 0.02em;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .doc-tools-actions {
      display: flex;
      align-items: center;
      flex: 0 0 auto;
      gap: 9px;
      margin-left: auto;
    }

    .doc-ai-open {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      height: 26px;
      padding: 0 9px;
      color: var(--accent-deep);
      background: rgba(255, 255, 255, 0.38);
      border: 1px solid rgba(198, 94, 56, 0.32);
      border-radius: 3px;
      font-family: var(--mono);
      font-size: 8.5px;
      letter-spacing: 0.02em;
      cursor: pointer;
      transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
    }

    .doc-ai-open svg { width: 12px; height: 12px; flex: 0 0 auto; }
    .doc-ai-open:hover { color: #fff; background: var(--accent-deep); border-color: var(--accent-deep); }

    .doc-reset {
      padding: 3px 0;
      color: var(--ink-faint);
      background: transparent;
      border: 0;
      border-bottom: 1px solid transparent;
      font-family: var(--mono);
      font-size: 8px;
      letter-spacing: 0.02em;
      cursor: pointer;
      transition: color 0.18s ease, border-color 0.18s ease;
    }

    .doc-reset:hover { color: var(--accent-deep); border-bottom-color: rgba(198, 94, 56, 0.4); }

    body.doc-editing .doc-tools {
      background: rgba(250, 247, 239, 0.98);
      box-shadow: 0 10px 24px -26px rgba(22, 25, 19, 0.55);
    }

    /* Editable document body */
    body.doc-editing [data-edit-root] {
      min-height: 80px;
      outline: 1px dashed rgba(198, 94, 56, 0.38);
      outline-offset: 15px;
      border-radius: 2px;
      background: rgba(255, 255, 255, 0.28);
      caret-color: var(--accent);
    }

    body.doc-editing [data-edit-root]:focus {
      outline-color: rgba(198, 94, 56, 0.62);
    }

    body.doc-editing [data-edit-root] a { cursor: text; }
    body.doc-editing [data-edit-root] .fig-btn { cursor: default; }
    body.doc-editing [data-edit-root] ::selection { color: #fff; background: rgba(198, 94, 56, 0.82); }

    /* AI reminder drawer */
    .doc-ai {
      position: fixed;
      inset: 0 0 0 auto;
      display: flex;
      width: min(456px, 100vw);
      max-width: none;
      height: 100vh;
      height: 100dvh;
      max-height: none;
      margin: 0;
      padding: 0;
      overflow: hidden;
      flex-direction: column;
      color: var(--ink);
      background: var(--bg);
      border: 0;
      border-left: 1px solid var(--line-strong);
      box-shadow: -30px 0 80px -42px rgba(18, 20, 16, 0.65);
    }

    .doc-ai:not([open]) { display: none; }

    .doc-ai::backdrop {
      background: rgba(18, 20, 16, 0.55);
      -webkit-backdrop-filter: blur(3px);
      backdrop-filter: blur(3px);
    }

    html.doc-ai-open,
    html.doc-ai-open body { overflow: hidden; }

    .doc-ai-head {
      display: flex;
      flex: 0 0 auto;
      align-items: flex-start;
      justify-content: space-between;
      gap: 16px;
      padding: 20px 22px 15px;
      background: var(--bg-soft);
      border-bottom: 1px solid var(--line);
    }

    .doc-ai-kicker {
      display: flex;
      align-items: center;
      gap: 8px;
      margin: 0 0 8px;
      color: var(--ink-faint);
      font-family: var(--mono);
      font-size: 7.8px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
    }

    .doc-ai-kicker::before {
      width: 16px;
      height: 1px;
      content: "";
      background: var(--accent);
    }

    .doc-ai-head h2 {
      margin: 0;
      font-family: var(--serif);
      font-size: 23px;
      font-weight: 500;
      line-height: 1.1;
      letter-spacing: -0.03em;
    }

    .doc-ai-deck {
      max-width: 340px;
      margin: 7px 0 0;
      color: var(--ink-faint);
      font-size: 8.8px;
      line-height: 1.65;
    }

    .doc-ai-close {
      flex: 0 0 auto;
      padding: 6px 8px;
      color: var(--ink-soft);
      background: transparent;
      border: 1px solid var(--line-strong);
      border-radius: 2px;
      font-family: var(--mono);
      font-size: 7.5px;
      cursor: pointer;
    }

    .doc-ai-close:hover { color: var(--accent-deep); border-color: rgba(198, 94, 56, 0.45); }

    .doc-ai-body {
      flex: 1 1 auto;
      min-height: 0;
      padding: 0 22px 26px;
      overflow-y: auto;
      overscroll-behavior: contain;
    }

    .doc-ai-section {
      padding: 16px 0;
      border-top: 1px solid var(--line);
    }

    .doc-ai-section:first-child {
      padding-top: 16px;
      border-top: 0;
    }

    .doc-ai-scope {
      margin: 0 0 9px;
      color: var(--ink-soft);
      font-family: var(--mono);
      font-size: 8.5px;
      line-height: 1.6;
    }

    .doc-ai-analyze {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 7px;
      min-height: 36px;
      padding: 8px 15px;
      color: var(--panel-text);
      background: var(--ink);
      border: 1px solid var(--ink);
      border-radius: 2px;
      font-size: 10.5px;
      font-weight: 600;
      cursor: pointer;
      transition: background-color 0.18s ease, border-color 0.18s ease, opacity 0.18s ease;
    }

    .doc-ai-analyze:hover { background: var(--accent-deep); border-color: var(--accent-deep); }
    .doc-ai-analyze:disabled { opacity: 0.55; cursor: wait; }

    .doc-ai-note {
      margin: 8px 0 0;
      color: var(--ink-faint);
      font-size: 8.3px;
      line-height: 1.65;
    }

    .doc-ai-config {
      border-top: 1px solid var(--line);
      border-bottom: 1px solid var(--line);
    }

    .doc-ai-config > summary {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 11px 0;
      color: var(--ink-soft);
      cursor: pointer;
      list-style: none;
      font-family: var(--mono);
      font-size: 8.5px;
      letter-spacing: 0.03em;
    }

    .doc-ai-config > summary::-webkit-details-marker { display: none; }

    .doc-ai-config > summary > span:last-child {
      color: var(--accent-deep);
      font-size: 7.5px;
    }

    .doc-ai-config > summary::after {
      content: "+";
      color: var(--accent);
      font-family: var(--sans);
      font-size: 15px;
      font-weight: 300;
      line-height: 1;
    }

    .doc-ai-config[open] > summary::after { content: "−"; }

    .doc-ai-fields {
      display: grid;
      gap: 9px;
      padding: 0 0 13px;
    }

    .doc-ai-fields label {
      display: grid;
      gap: 4px;
      color: var(--ink-faint);
      font-family: var(--mono);
      font-size: 7.5px;
      letter-spacing: 0.03em;
    }

    .doc-ai-fields input {
      width: 100%;
      height: 32px;
      padding: 0 9px;
      color: var(--ink);
      background: #fff;
      border: 1px solid var(--line-strong);
      border-radius: 2px;
      font-family: var(--mono);
      font-size: 10px;
      outline: none;
    }

    .doc-ai-fields input:focus { border-color: rgba(198, 94, 56, 0.55); box-shadow: 0 0 0 3px rgba(198, 94, 56, 0.07); }

    .doc-ai-config-actions {
      display: flex;
      align-items: center;
      gap: 13px;
      padding-top: 2px;
    }

    .doc-ai-config-actions button {
      min-height: 28px;
      padding: 5px 10px;
      color: var(--ink-soft);
      background: transparent;
      border: 1px solid var(--line-strong);
      border-radius: 2px;
      font-family: var(--mono);
      font-size: 8px;
      cursor: pointer;
    }

    .doc-ai-config-actions button:first-child {
      color: var(--panel-text);
      background: var(--ink);
      border-color: var(--ink);
    }

    .doc-ai-config-actions button:hover { color: var(--accent-deep); border-color: rgba(198, 94, 56, 0.45); }
    .doc-ai-config-actions button:first-child:hover { color: #fff; background: var(--accent-deep); border-color: var(--accent-deep); }

    .doc-ai-config-note {
      margin: 0;
      color: var(--ink-faint);
      font-size: 7.8px;
      line-height: 1.65;
    }

    .doc-ai-section-head {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 8px;
      color: var(--ink-soft);
      font-family: var(--mono);
      font-size: 8px;
      letter-spacing: 0.04em;
    }

    .doc-ai-section-head span:last-child {
      color: var(--ink-faint);
      font-size: 7.3px;
      font-weight: 400;
    }

    .doc-ai-local {
      display: grid;
      gap: 0;
      margin: 0;
      padding: 0;
      list-style: none;
      border-top: 1px solid var(--line);
    }

    .doc-ai-local li {
      padding: 7px 0;
      color: var(--ink-soft);
      border-bottom: 1px solid var(--line);
      font-size: 9px;
      line-height: 1.65;
    }

    .doc-ai-local li::before {
      margin-right: 6px;
      color: var(--accent);
      content: "⚠";
    }

    .doc-ai-results {
      display: grid;
      gap: 0;
      border-top: 1px solid var(--line);
    }

    .doc-ai-item {
      display: grid;
      grid-template-columns: 16px 62px minmax(0, 1fr);
      gap: 7px;
      padding: 9px 0;
      border-bottom: 1px solid var(--line);
    }

    .doc-ai-item-index {
      color: var(--ink-faint);
      font-family: var(--mono);
      font-size: 7.5px;
      line-height: 1.8;
    }

    .doc-ai-type {
      align-self: start;
      justify-self: start;
      padding: 1px 5px;
      border-radius: 2px;
      font-family: var(--mono);
      font-size: 6.5px;
      line-height: 1.7;
      white-space: nowrap;
    }

    .doc-ai-type[data-type="易错"] { color: #9c4d31; background: #f4e1d7; }
    .doc-ai-type[data-type="补漏"] { color: #4f6b52; background: #e5eee4; }
    .doc-ai-type[data-type="上板验证"] { color: #3e6684; background: #e3ecf2; }
    .doc-ai-type[data-type="面试追问"] { color: #80622f; background: #f2ead8; }

    .doc-ai-item p {
      margin: 0;
      color: var(--ink-soft);
      font-size: 9.5px;
      line-height: 1.7;
    }

    .doc-ai-error {
      margin: 10px 0 0;
      padding: 8px 10px;
      color: #8e3d2c;
      background: rgba(198, 94, 56, 0.075);
      border-left: 2px solid rgba(198, 94, 56, 0.5);
      font-size: 9px;
      line-height: 1.65;
    }

    .doc-ai-error[hidden] { display: none; }

    .doc-ai-loading {
      color: var(--ink-faint);
      font-family: var(--mono);
      font-size: 8.5px;
      line-height: 1.6;
    }

    @media (max-width: 820px) {
      .doc-tools { top: 47px; }
      .doc-tools-inner { gap: 8px; }
      .doc-save-state { max-width: 76px; font-size: 7.2px; }
      .doc-ai-open { padding: 0 7px; font-size: 8px; }
      .doc-reset { font-size: 7.2px; }
      body.doc-editing [data-edit-root] { outline-offset: 10px; }
      .doc-ai { border-left: 0; }
      .doc-ai-head { padding: 16px 16px 12px; }
      .doc-ai-body { padding: 0 16px 22px; }
      .doc-ai-deck { font-size: 8.2px; }
    }

    @media (max-width: 390px) {
      .doc-save-state { display: none; }
      .doc-mode-btn { padding: 0 8px; font-size: 8px; }
    }

    @media print {
      .doc-tools, .doc-ai { display: none !important; }
      body.doc-editing [data-edit-root] {
        outline: none !important;
        background: none !important;
      }
    }