:root {
  --bop-paper: #f7f8f5;
  --bop-surface: #ffffff;
  --bop-ink: #161a18;
  --bop-muted: #5b625e;
  --bop-line: #cfd5d1;
  --bop-line-strong: #9da7a1;
  --bop-teal: #087f75;
  --bop-teal-dark: #075e58;
  --bop-coral: #c7472f;
  --bop-yellow: #f0bc3c;
  --bop-blue: #2d68b2;
  --bop-max: 1240px;
  --bop-reader-width: 900px;
  --bop-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Noto Serif SC", serif;
  --bop-sans: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  --bop-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 118px;
}

body.bop-page {
  margin: 0;
  background: var(--bop-paper);
  color: var(--bop-ink);
  font-family: var(--bop-sans);
  font-size: 16px;
  line-height: 1.72;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

.bop-page button,
.bop-page input,
.bop-page select {
  font: inherit;
  letter-spacing: 0;
}

.bop-page a {
  color: var(--bop-teal-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.bop-page a:hover {
  color: var(--bop-coral);
}

.bop-page :focus-visible {
  outline: 3px solid color-mix(in srgb, var(--bop-yellow) 75%, white);
  outline-offset: 3px;
}

.bop-shell {
  width: min(var(--bop-max), calc(100% - 40px));
  margin: 0 auto;
}

.bop-masthead {
  border-bottom: 1px solid var(--bop-line);
  background: var(--bop-surface);
}

.bop-masthead-inner {
  display: grid;
  grid-template-columns: 148px minmax(0, 1fr);
  gap: 34px;
  align-items: center;
  padding: 42px 0 38px;
}

.bop-cover {
  display: block;
  width: 148px;
  height: auto;
  aspect-ratio: 7 / 10;
  border: 1px solid var(--bop-line-strong);
  background: white;
  object-fit: cover;
  box-shadow: 7px 8px 0 rgba(8, 127, 117, 0.14);
}

.bop-eyebrow,
.bop-part-label,
.bop-reader-kicker {
  margin: 0 0 10px;
  color: var(--bop-coral);
  font-family: var(--bop-mono);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0;
  text-transform: uppercase;
}

.bop-masthead h1,
.bop-chapter-hero h1 {
  margin: 0;
  font-family: var(--bop-serif);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0;
}

.bop-masthead h1 {
  max-width: 820px;
  font-size: clamp(38px, 6vw, 72px);
}

.bop-subtitle {
  max-width: 780px;
  margin: 16px 0 0;
  color: var(--bop-muted);
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.58;
}

.bop-meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 22px;
  color: var(--bop-muted);
  font-size: 13px;
}

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

.bop-meta-line span::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--bop-teal);
  content: "";
}

.bop-action-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.bop-button,
.bop-icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border: 1px solid var(--bop-line-strong);
  border-radius: 4px;
  background: var(--bop-surface);
  color: var(--bop-ink) !important;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}

.bop-button {
  gap: 8px;
  padding: 10px 15px;
  font-size: 13px;
}

.bop-button.primary {
  border-color: var(--bop-teal);
  background: var(--bop-teal);
  color: white !important;
}

.bop-button:hover,
.bop-icon-button:hover {
  border-color: var(--bop-coral);
  color: var(--bop-coral) !important;
}

.bop-button.primary:hover {
  border-color: var(--bop-teal-dark);
  background: var(--bop-teal-dark);
  color: white !important;
}

.bop-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-bottom: 1px solid var(--bop-line);
  background: var(--bop-ink);
  color: white;
}

.bop-stat {
  min-width: 0;
  padding: 19px 24px;
  border-right: 1px solid rgba(255, 255, 255, 0.2);
}

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

.bop-stat strong {
  display: block;
  font-family: var(--bop-serif);
  font-size: 25px;
  line-height: 1.1;
}

.bop-stat span {
  display: block;
  margin-top: 4px;
  color: #dfe5e1;
  font-size: 12px;
}

.bop-directory-main {
  padding: 48px 0 72px;
}

.bop-section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 20px;
}

.bop-section-heading h2,
.bop-guide h2,
.bop-reader-heading h2,
.bop-license h2 {
  margin: 0;
  font-family: var(--bop-serif);
  font-size: clamp(25px, 3vw, 38px);
  line-height: 1.2;
  letter-spacing: 0;
}

.bop-section-heading p {
  max-width: 680px;
  margin: 0;
  color: var(--bop-muted);
  font-size: 14px;
}

.bop-continue {
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin: 0 0 38px;
  padding: 18px 20px;
  border-left: 5px solid var(--bop-yellow);
  background: #fff9e8;
}

.bop-continue[data-ready="true"] {
  display: flex;
}

.bop-continue p {
  margin: 0;
}

.bop-continue strong {
  display: block;
}

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

.bop-route-band {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 48px;
  border-top: 1px solid var(--bop-line);
  border-bottom: 1px solid var(--bop-line);
}

.bop-route {
  padding: 22px 24px 24px;
  border-right: 1px solid var(--bop-line);
}

.bop-route:last-child {
  border-right: 0;
}

.bop-route b {
  display: block;
  margin-bottom: 7px;
  color: var(--bop-teal-dark);
  font-family: var(--bop-serif);
  font-size: 18px;
}

.bop-route p {
  margin: 0;
  color: var(--bop-muted);
  font-size: 13px;
}

.bop-part {
  margin-top: 38px;
}

.bop-part-head {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 20px;
  align-items: baseline;
  padding: 0 0 12px;
  border-bottom: 3px solid var(--bop-ink);
}

.bop-part-head span {
  color: var(--bop-coral);
  font-family: var(--bop-mono);
  font-size: 11px;
  font-weight: 700;
}

.bop-part-head h3 {
  margin: 0;
  font-family: var(--bop-serif);
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: 0;
}

.bop-chapter-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.bop-chapter-row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  min-height: 116px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--bop-line);
  color: inherit !important;
  text-decoration: none;
}

.bop-chapter-row:hover {
  background: white;
  color: inherit !important;
}

.bop-chapter-number {
  color: var(--bop-teal-dark);
  font-family: var(--bop-serif);
  font-size: 34px;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.bop-chapter-copy {
  min-width: 0;
}

.bop-chapter-copy h4 {
  margin: 0;
  font-family: var(--bop-serif);
  font-size: 21px;
  line-height: 1.25;
  letter-spacing: 0;
}

.bop-chapter-copy p {
  max-width: 820px;
  margin: 7px 0 0;
  color: var(--bop-muted);
  font-size: 14px;
}

.bop-chapter-meta {
  display: grid;
  gap: 5px;
  min-width: 92px;
  color: var(--bop-muted);
  font-family: var(--bop-mono);
  font-size: 11px;
  text-align: right;
}

.bop-license {
  margin-top: 52px;
  padding: 30px 0 0;
  border-top: 4px solid var(--bop-yellow);
}

.bop-license-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, 0.7fr);
  gap: 34px;
  margin-top: 18px;
}

.bop-license p {
  margin: 0 0 12px;
  color: var(--bop-muted);
}

.bop-license-links {
  display: grid;
  align-content: start;
  gap: 9px;
}

.bop-footer {
  margin-top: 66px;
  padding: 26px 0 34px;
  border-top: 1px solid var(--bop-line);
  color: var(--bop-muted);
  font-size: 12px;
}

/* Chapter page */
.bop-chapter-head {
  border-bottom: 1px solid var(--bop-line);
  background: white;
}

.bop-breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  padding-top: 22px;
  color: var(--bop-muted);
  font-size: 12px;
}

.bop-breadcrumbs a {
  color: inherit;
}

.bop-chapter-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: end;
  padding: 34px 0 40px;
}

.bop-chapter-hero h1 {
  max-width: 880px;
  font-size: clamp(36px, 5.5vw, 66px);
}

.bop-chapter-summary {
  max-width: 820px;
  margin: 17px 0 0;
  color: var(--bop-muted);
  font-size: 18px;
}

.bop-page-badge {
  min-width: 118px;
  padding: 15px 17px;
  border-top: 4px solid var(--bop-teal);
  background: var(--bop-paper);
  text-align: right;
}

.bop-page-badge strong,
.bop-page-badge span {
  display: block;
}

.bop-page-badge strong {
  font-family: var(--bop-serif);
  font-size: 25px;
}

.bop-page-badge span {
  color: var(--bop-muted);
  font-size: 11px;
}

.bop-guide {
  padding: 40px 0 42px;
  border-bottom: 1px solid var(--bop-line);
}

.bop-guide-intro {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 38px;
  align-items: start;
}

.bop-guide-intro > p {
  margin: 0;
  color: var(--bop-muted);
  font-size: 15px;
}

.bop-guide-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 30px;
  border-top: 1px solid var(--bop-line);
  border-bottom: 1px solid var(--bop-line);
}

.bop-guide-column {
  padding: 22px 24px 24px;
  border-right: 1px solid var(--bop-line);
}

.bop-guide-column:last-child {
  border-right: 0;
}

.bop-guide-column h3 {
  margin: 0 0 10px;
  color: var(--bop-teal-dark);
  font-size: 13px;
  line-height: 1.3;
  letter-spacing: 0;
}

.bop-guide-column ul {
  margin: 0;
  padding-left: 19px;
}

.bop-guide-column li {
  margin: 6px 0;
  color: var(--bop-muted);
  font-size: 13px;
}

.bop-keyword-line {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 28px;
}

.bop-keyword-line span {
  padding: 5px 9px;
  border: 1px solid var(--bop-line);
  border-radius: 4px;
  background: white;
  color: var(--bop-muted);
  font-family: var(--bop-mono);
  font-size: 11px;
}

.bop-reader-section {
  padding: 42px 0 60px;
}

.bop-reader-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
}

.bop-reader-heading p {
  max-width: 640px;
  margin: 0;
  color: var(--bop-muted);
  font-size: 13px;
}

.bop-reader-grid {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.bop-section-nav {
  position: sticky;
  top: 76px;
  max-height: calc(100vh - 96px);
  overflow: auto;
  border-top: 3px solid var(--bop-ink);
  background: white;
}

.bop-section-nav h3 {
  margin: 0;
  padding: 15px 16px 11px;
  border-bottom: 1px solid var(--bop-line);
  font-size: 12px;
  letter-spacing: 0;
}

.bop-section-nav button {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 8px;
  width: 100%;
  padding: 11px 13px;
  border: 0;
  border-bottom: 1px solid var(--bop-line);
  background: white;
  color: var(--bop-muted);
  font-size: 12px;
  line-height: 1.35;
  text-align: left;
  cursor: pointer;
}

.bop-section-nav button:hover,
.bop-section-nav button[aria-current="true"] {
  background: #eaf6f4;
  color: var(--bop-teal-dark);
}

.bop-section-nav .page-no {
  color: var(--bop-coral);
  font-family: var(--bop-mono);
  font-size: 10px;
}

.bop-reader {
  min-width: 0;
  border-top: 3px solid var(--bop-ink);
  background: #e7ebe8;
}

.bop-toolbar {
  position: sticky;
  top: 52px;
  z-index: 20;
  display: grid;
  grid-template-columns: auto minmax(170px, 1fr) auto;
  gap: 10px;
  align-items: center;
  min-height: 60px;
  padding: 9px 11px;
  border-bottom: 1px solid var(--bop-line-strong);
  background: rgba(255, 255, 255, 0.97);
}

.bop-toolbar-group {
  display: flex;
  align-items: center;
  gap: 7px;
  min-width: 0;
}

.bop-toolbar-group.center {
  justify-content: center;
}

.bop-toolbar-group.end {
  justify-content: end;
}

.bop-icon-button {
  width: 38px;
  height: 38px;
  min-height: 38px;
  flex: none;
  padding: 0;
  font-size: 18px;
}

.bop-icon-button:disabled {
  cursor: not-allowed;
  opacity: 0.35;
}

.bop-page-input {
  width: 62px;
  height: 36px;
  border: 1px solid var(--bop-line-strong);
  border-radius: 4px;
  background: white;
  color: var(--bop-ink);
  font-family: var(--bop-mono);
  text-align: center;
}

.bop-page-total,
.bop-zoom-label {
  color: var(--bop-muted);
  font-family: var(--bop-mono);
  font-size: 11px;
  white-space: nowrap;
}

.bop-reader-progress {
  height: 4px;
  background: #d3d9d5;
}

.bop-reader-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--bop-coral);
  transition: width 180ms ease;
}

.bop-search-bar {
  display: none;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  padding: 10px;
  border-bottom: 1px solid var(--bop-line);
  background: white;
}

.bop-search-bar[data-open="true"] {
  display: grid;
}

.bop-search-bar input {
  min-width: 0;
  height: 38px;
  padding: 8px 11px;
  border: 1px solid var(--bop-line-strong);
  border-radius: 4px;
}

.bop-search-results {
  display: none;
  max-height: 240px;
  overflow: auto;
  border-bottom: 1px solid var(--bop-line);
  background: white;
}

.bop-search-results[data-open="true"] {
  display: block;
}

.bop-search-result {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 12px;
  width: 100%;
  padding: 11px 13px;
  border: 0;
  border-bottom: 1px solid var(--bop-line);
  background: white;
  color: var(--bop-muted);
  font-size: 12px;
  line-height: 1.45;
  text-align: left;
  cursor: pointer;
}

.bop-search-result:hover {
  background: #fff8e3;
}

.bop-search-result strong {
  color: var(--bop-coral);
  font-family: var(--bop-mono);
}

.bop-canvas-viewport {
  position: relative;
  min-height: min(76vh, 860px);
  overflow: auto;
  padding: 24px;
  text-align: center;
}

.bop-page-canvas-wrap {
  position: relative;
  display: inline-block;
  min-width: min(100%, 360px);
  min-height: 560px;
  border: 1px solid var(--bop-line-strong);
  background: white;
  box-shadow: 0 8px 25px rgba(22, 26, 24, 0.13);
  vertical-align: top;
}

.bop-page-canvas-wrap canvas {
  display: block;
  max-width: none;
  background: white;
}

.bop-loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 30px;
  color: var(--bop-muted);
  font-family: var(--bop-mono);
  font-size: 12px;
}

.bop-loading[hidden] {
  display: none;
}

.bop-reader-message {
  display: none;
  margin: 0;
  padding: 18px 20px;
  border-top: 4px solid var(--bop-coral);
  background: white;
  color: var(--bop-muted);
  font-size: 13px;
}

.bop-reader-message[data-visible="true"] {
  display: block;
}

.bop-native-fallback {
  display: none;
  width: 100%;
  min-height: 72vh;
  border: 0;
  background: white;
}

.bop-native-fallback[data-visible="true"] {
  display: block;
}

.bop-source-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  padding: 13px 15px;
  border-top: 1px solid var(--bop-line-strong);
  background: white;
  color: var(--bop-muted);
  font-size: 11px;
}

.bop-source-strip p {
  margin: 0;
}

.bop-chapter-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 38px;
  border-top: 1px solid var(--bop-line);
  border-bottom: 1px solid var(--bop-line);
}

.bop-chapter-nav a {
  display: grid;
  gap: 5px;
  min-height: 100px;
  padding: 20px 22px;
  color: inherit;
  text-decoration: none;
}

.bop-chapter-nav a + a {
  border-left: 1px solid var(--bop-line);
  text-align: right;
}

.bop-chapter-nav small {
  color: var(--bop-coral);
  font-family: var(--bop-mono);
  font-size: 10px;
}

.bop-chapter-nav strong {
  font-family: var(--bop-serif);
  font-size: 17px;
}

.bop-flow-context {
  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;
}

@media (max-width: 980px) {
  .bop-reader-grid {
    grid-template-columns: 1fr;
  }

  .bop-section-nav {
    position: static;
    display: flex;
    max-height: none;
    overflow-x: auto;
    border-top-width: 2px;
  }

  .bop-section-nav h3 {
    display: none;
  }

  .bop-section-nav button {
    grid-template-columns: auto;
    min-width: 156px;
    min-height: 58px;
    border-right: 1px solid var(--bop-line);
    border-bottom: 0;
  }

  .bop-section-nav .page-no {
    display: block;
  }
}

@media (max-width: 760px) {
  .bop-shell {
    width: min(100% - 28px, var(--bop-max));
  }

  .bop-masthead-inner {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 20px;
    padding: 30px 0;
  }

  .bop-cover {
    width: 92px;
    box-shadow: 4px 5px 0 rgba(8, 127, 117, 0.14);
  }

  .bop-masthead h1 {
    font-size: clamp(31px, 11vw, 48px);
  }

  .bop-subtitle {
    font-size: 15px;
  }

  .bop-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .bop-stat:nth-child(2) {
    border-right: 0;
  }

  .bop-stat:nth-child(-n + 2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  }

  .bop-route-band,
  .bop-guide-columns {
    grid-template-columns: 1fr;
  }

  .bop-route,
  .bop-guide-column {
    border-right: 0;
    border-bottom: 1px solid var(--bop-line);
  }

  .bop-route:last-child,
  .bop-guide-column:last-child {
    border-bottom: 0;
  }

  .bop-part-head {
    grid-template-columns: 74px minmax(0, 1fr);
  }

  .bop-chapter-row {
    grid-template-columns: 54px minmax(0, 1fr);
    gap: 14px;
  }

  .bop-chapter-number {
    font-size: 27px;
  }

  .bop-chapter-meta {
    grid-column: 2;
    grid-auto-flow: column;
    justify-content: start;
    min-width: 0;
    text-align: left;
  }

  .bop-license-grid,
  .bop-guide-intro {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .bop-chapter-hero {
    grid-template-columns: 1fr;
    padding-top: 28px;
  }

  .bop-page-badge {
    width: max-content;
    min-width: 112px;
    text-align: left;
  }

  .bop-toolbar {
    grid-template-columns: 1fr auto;
  }

  .bop-toolbar-group.center {
    grid-column: 1 / -1;
    grid-row: 1;
    justify-content: center;
  }

  .bop-toolbar-group.start {
    grid-column: 1;
    grid-row: 2;
  }

  .bop-toolbar-group.end {
    grid-column: 2;
    grid-row: 2;
  }

  .bop-canvas-viewport {
    min-height: 62vh;
    padding: 12px;
  }

  .bop-page-canvas-wrap {
    min-height: 430px;
  }

  .bop-reader-heading {
    align-items: start;
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .bop-masthead-inner {
    grid-template-columns: 1fr;
  }

  .bop-cover {
    width: 78px;
  }

  .bop-action-line .bop-button {
    flex: 1 1 150px;
  }

  .bop-section-heading {
    align-items: start;
    flex-direction: column;
  }

  .bop-part-head {
    grid-template-columns: 1fr;
    gap: 3px;
  }

  .bop-chapter-copy h4 {
    font-size: 18px;
  }

  .bop-continue {
    align-items: stretch;
    flex-direction: column;
  }

  .bop-chapter-nav {
    grid-template-columns: 1fr;
  }

  .bop-chapter-nav a + a {
    border-top: 1px solid var(--bop-line);
    border-left: 0;
    text-align: left;
  }

  .bop-source-strip {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .bop-reader-progress span {
    transition: none;
  }
}