:root {
  --paper: #f5f1e8;
  --white: #fffefa;
  --ink: #10283f;
  --muted: #4f6172;
  --line: #d8d1c5;
  --blue: #1a62c6;
  --pale-blue: #e7eef7;
  --rust: #ad5b3b;
  --pale-rust: #f7e4d7;
  --green: #24624a;
  --pale-green: #e7f1e9;
  --sans: Arial, Helvetica, sans-serif;
  --serif: Georgia, "Times New Roman", serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.65 var(--sans);
}
a {
  color: var(--blue);
  text-underline-offset: 3px;
}
button,
input {
  font: inherit;
}
button {
  cursor: pointer;
}
button:disabled {
  cursor: not-allowed;
  opacity: 0.52;
}
button,
a,
input,
summary {
  touch-action: manipulation;
}
a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
}
button {
  border: 1px solid #aeb8bc;
  background: var(--white);
  color: var(--ink);
  padding: 9px 15px;
  border-radius: 5px;
  font-size: 14px;
  font-weight: 700;
}
button:hover:not(:disabled) {
  border-color: var(--blue);
  background: var(--pale-blue);
}
.primary-button {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}
.primary-button:hover:not(:disabled) {
  background: #104ba9;
  color: #fff;
}
.text-button {
  border: 0;
  padding: 0;
  background: none;
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 400;
}
.text-button:hover:not(:disabled) {
  background: none;
}
.skip-link {
  position: fixed;
  left: 20px;
  top: -100px;
  background: var(--white);
  z-index: 20;
  padding: 12px;
}
.skip-link:focus {
  top: 10px;
}
.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: 1600px;
  margin: auto;
  padding: 25px 48px;
  border-bottom: 1px solid var(--line);
}
.wordmark {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
  font-size: 10px;
  line-height: 1.4;
  font-weight: 800;
  letter-spacing: 1.5px;
}
.brand-symbol {
  font: 700 44px/1 var(--serif);
  letter-spacing: -3px;
}
.brand-symbol span {
  color: var(--rust);
}
.edition {
  font-size: 12px;
  text-align: center;
  margin: 0;
  line-height: 1.6;
  letter-spacing: 0.8px;
}
.edition span {
  color: var(--muted);
  letter-spacing: 0;
}
.utility-links {
  display: flex;
  gap: 14px;
  margin-left: auto;
  font-size: 11px;
  font-weight: 700;
}
.utility-links a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.utility-links a:hover {
  color: var(--blue);
  border-color: currentColor;
}
.offline-badge {
  border: 1px solid var(--line);
  padding: 5px 10px;
  border-radius: 20px;
  font-size: 11px;
  white-space: nowrap;
}
.offline-badge span {
  color: var(--green);
  margin-right: 6px;
}
.book-layout {
  display: grid;
  grid-template-columns: 268px minmax(0, 1fr);
  max-width: 1600px;
  margin: auto;
}
.sidebar {
  border-right: 1px solid var(--line);
  padding: 38px 24px 24px 35px;
}
.sidebar-inner {
  position: sticky;
  top: 24px;
}
.search-label {
  font-size: 11px;
  letter-spacing: 1px;
  font-weight: 700;
  text-transform: uppercase;
}
.search-field {
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid #a6b1b5;
  margin: 8px 0 27px;
  padding: 6px 0;
}
.search-field span {
  font-size: 25px;
}
.search-field input {
  width: 100%;
  border: 0;
  min-width: 0;
  background: transparent;
  color: var(--ink);
  font-size: 12px;
  padding: 7px 0;
}
.search-field input::placeholder {
  color: var(--muted);
}
.eyebrow {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.8px;
  color: var(--rust);
  text-transform: uppercase;
  margin: 0 0 18px;
}
.sidebar nav .eyebrow {
  color: var(--muted);
}
#chapter-list {
  padding: 0;
  list-style: none;
  margin: 0;
}
#chapter-list li {
  margin: 0 0 6px;
}
#chapter-list a {
  display: grid;
  grid-template-columns: 25px 1fr 13px;
  gap: 7px;
  padding: 9px 8px;
  text-decoration: none;
  color: var(--muted);
  font-size: 12px;
  border-radius: 4px;
  line-height: 1.5;
}
#chapter-list a[aria-current="page"] {
  background: var(--pale-blue);
  color: var(--blue);
  font-weight: 700;
}
#chapter-list a:hover {
  background: #eceee7;
}
#chapter-list a[aria-current="page"]:hover {
  background: var(--pale-blue);
}
.chapter-num {
  font: italic 15px var(--serif);
}
.read-tick {
  color: var(--green);
}
.progress-card {
  margin-top: 28px;
  border-top: 1px solid var(--line);
  padding-top: 20px;
}
.progress-card > div {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
}
.progress-card strong {
  font-size: 11px;
}
progress {
  appearance: none;
  display: block;
  width: 100%;
  height: 4px;
  border: 0;
  margin-top: 11px;
  background: #dfe3dc;
}
progress::-webkit-progress-bar {
  background: #dfe3dc;
}
progress::-webkit-progress-value {
  background: var(--blue);
}
progress::-moz-progress-bar {
  background: var(--blue);
}
.progress-card p,
.storage-status {
  font-size: 10px;
  color: var(--muted);
  line-height: 1.5;
}
.support-link {
  font-size: 11px;
  display: block;
  margin: 20px 0 12px;
}
.support-routes {
  display: grid;
  gap: 7px;
  margin: 14px 0 13px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.support-routes a {
  font-size: 10px;
  line-height: 1.4;
}
.sidebar .text-button {
  font-size: 10px;
}
#search-results:empty {
  display: none;
}
#search-results {
  margin: -12px 0 22px;
  font-size: 12px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}
#search-results a {
  display: block;
  padding: 7px 0;
}
.no-results {
  color: var(--muted);
}
main {
  min-width: 0;
  padding: 55px 68px 35px;
  max-width: 1250px;
}
.chapter-header {
  margin-bottom: 30px;
}
.chapter-kicker {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  padding-bottom: 13px;
  margin-bottom: 25px;
}
.chapter-kicker span:first-child {
  color: var(--rust);
  font-weight: 700;
}
h1 {
  font: 400 clamp(40px, 4.5vw, 68px)/1.04 var(--serif);
  letter-spacing: -2.1px;
  margin: 0 0 22px;
  max-width: 830px;
}
h1 em {
  font-weight: 400;
  color: var(--blue);
}
.standfirst {
  font: 19px/1.6 var(--serif);
  max-width: 720px;
  color: var(--muted);
  margin: 0 0 24px;
}
.reading-meta {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
}
.companion-route-links {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 18px;
}
.companion-route-links a {
  display: inline-flex;
  align-items: center;
  border: 1px solid #b9c8d5;
  border-radius: 999px;
  padding: 7px 11px;
  color: var(--blue);
  background: var(--pale-blue);
  font-size: 11px;
  font-weight: 700;
  text-decoration: none;
}
.companion-route-links a:hover {
  border-color: var(--blue);
  background: var(--white);
}
.hero-art {
  margin: 35px 0 28px;
  background: var(--ink);
  border-radius: 7px;
  overflow: hidden;
  color: white;
  position: relative;
}
.hero-art svg {
  display: block;
  width: 100%;
  height: auto;
}
.hero-art .art-label {
  padding: 0 24px 20px;
  font-size: 11px;
  color: #c8d7e4;
  line-height: 1.5;
}
.content-section {
  margin: 42px 0;
}
.content-section h2 {
  font: 400 30px/1.2 var(--serif);
  letter-spacing: -0.5px;
  margin: 0 0 18px;
}
.content-section h3 {
  font: 700 17px/1.4 var(--sans);
  margin: 25px 0 10px;
}
.content-section > p,
.content-section > ul,
.content-section > ol {
  max-width: 770px;
}
.content-section p {
  margin: 0 0 16px;
}
.content-section li {
  margin-bottom: 8px;
}
.small-label {
  display: block;
  font-size: 10px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 12px;
}
.quote {
  font: italic 25px/1.45 var(--serif);
  border-left: 3px solid var(--rust);
  padding: 6px 0 6px 24px;
  margin: 28px 0;
  max-width: 790px;
}
.margin-note {
  background: var(--pale-rust);
  border-radius: 5px;
  padding: 20px 24px;
  font-size: 14px;
  margin: 25px 0;
}
.margin-note strong {
  display: block;
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: 8px;
}
.concept-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 22px 0;
}
.concept-card {
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 5px;
  padding: 22px;
}
.concept-card .index {
  font: italic 22px var(--serif);
  color: var(--rust);
}
.concept-card h3 {
  font-size: 16px;
  margin: 12px 0 9px;
}
.concept-card p {
  font-size: 14px;
  margin: 0;
  color: var(--muted);
}
.three-columns {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.chapter-map {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 25px 0;
}
.chapter-map a {
  display: flex;
  gap: 16px;
  padding: 22px;
  background: var(--paper);
  text-decoration: none;
  color: var(--ink);
  font-size: 14px;
  align-items: flex-start;
}
.chapter-map a:hover {
  background: var(--white);
}
.chapter-map .index {
  font: italic 26px var(--serif);
  color: var(--rust);
}
.chapter-map small {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 400;
  margin-top: 5px;
}
.route-selector {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 15px 0;
}
.route-selector button[aria-pressed="true"] {
  background: var(--blue);
  color: white;
  border-color: var(--blue);
}
.route-detail {
  border: 1px solid var(--line);
  padding: 22px;
  background: var(--white);
  min-height: 115px;
  border-radius: 5px;
}
.route-detail p {
  margin: 0;
  font-size: 14px;
}
.route-detail strong {
  display: block;
  margin-bottom: 8px;
}
.diagram {
  border: 1px solid var(--line);
  border-radius: 7px;
  overflow: hidden;
  background: var(--white);
  margin: 24px 0;
}
.diagram-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 15px 22px;
  border-bottom: 1px solid var(--line);
}
.diagram-head h3 {
  font-size: 13px;
  margin: 0;
}
.sim-label {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.7px;
  background: var(--pale-rust);
  padding: 4px 7px;
  border-radius: 3px;
  color: #82351f;
  white-space: nowrap;
}
.diagram-body {
  padding: 24px;
}
.diagram-caption {
  font-size: 12px;
  color: var(--muted);
  margin: 0;
  padding: 13px 22px;
  border-top: 1px solid var(--line);
}
.diagram .controls {
  display: flex;
  gap: 9px;
  flex-wrap: wrap;
  margin: 22px 0 0;
}
.diagram .controls button {
  font-size: 12px;
}
.sim-state {
  margin: 18px 0 0 !important;
  min-height: 58px;
  background: var(--paper);
  padding: 14px 16px;
  font-size: 13px;
  border-radius: 4px;
}
.lifecycle-track {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 10px 0 25px;
}
.state-node {
  flex: 1;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 17px 6px;
  font-size: 12px;
  background: var(--paper);
  color: var(--muted);
}
.state-node.active {
  background: var(--pale-blue);
  border: 2px solid var(--blue);
  color: var(--blue);
  font-weight: 700;
}
.state-arrow {
  color: #8798a4;
}
.terminal {
  background: var(--ink);
  color: #e6f0f7;
  border-radius: 5px;
  overflow: auto;
  padding: 18px 21px;
  font:
    13px/1.7 var(--mono);
  white-space: pre-wrap;
  margin: 20px 0;
}
.terminal .prompt {
  color: #92b9fa;
}
.terminal-caption {
  font-size: 12px;
  color: var(--muted);
  margin-top: -10px !important;
}
code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: #e8ebe5;
  padding: 2px 5px;
  border-radius: 3px;
  overflow-wrap: anywhere;
}
.terminal code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}
.table-scroll {
  overflow-x: auto;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 20px 0;
}
th {
  text-align: left;
  font-size: 10px;
  letter-spacing: 0.7px;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 2px solid var(--line);
  padding: 12px;
}
td {
  border-bottom: 1px solid var(--line);
  padding: 14px 12px;
  vertical-align: top;
}
.diagram-svg {
  display: block;
  width: 100%;
  height: auto;
}
.diagram-scroll {
  overflow-x: auto;
}
.mobile-diagram-hint {
  display: none;
}
.diagram-svg text {
  font-family: var(--sans);
}
.network-option {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 13px;
  margin: 18px 0;
}
.model-accordion {
  margin: 20px 0;
  border: 1px solid #c5d8e8;
  border-radius: 12px;
  background: #eff5fb;
  overflow: hidden;
}
.model-accordion > summary {
  display: list-item;
  min-height: 48px;
  padding: 13px 18px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  touch-action: manipulation;
}
.model-accordion[open] > summary {
  border-bottom: 1px solid #c5d8e8;
}
.model-accordion > [data-course-model] {
  margin: 16px;
}
.network-option input {
  margin-top: 6px;
  accent-color: var(--blue);
}
.data-stores {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.data-store {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 17px;
  background: var(--paper);
}
.data-store h4 {
  font-size: 12px;
  margin: 0 0 12px;
}
.record {
  display: inline-block;
  padding: 8px;
  background: var(--pale-blue);
  border: 1px solid #b6cbed;
  color: var(--blue);
  border-radius: 3px;
  font:
    12px Consolas,
    monospace;
  margin: 3px;
}
.empty-record {
  font: italic 13px var(--serif);
  color: var(--muted);
}
.status-chip {
  display: inline-block;
  padding: 4px 9px;
  border-radius: 30px;
  background: var(--pale-blue);
  color: var(--blue);
  font-size: 11px;
  font-weight: 700;
}
.status-chip.good {
  background: var(--pale-green);
  color: var(--green);
}
.status-chip.bad {
  background: var(--pale-rust);
  color: var(--rust);
}
.release-track {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.release-card {
  border: 1px solid var(--line);
  padding: 20px;
  border-radius: 5px;
  background: var(--paper);
}
.release-card h4 {
  font-size: 13px;
  margin: 0 0 8px;
}
.release-card code {
  display: block;
  font-size: 11px;
  margin: 10px 0;
  overflow-wrap: anywhere;
}
.release-card.active {
  border: 2px solid var(--blue);
}
.release-card p {
  font-size: 12px;
  color: var(--muted);
  margin: 0;
}
.quiz {
  background: var(--pale-blue);
  padding: 26px 28px;
  border-radius: 7px;
  margin: 36px 0;
}
.quiz .eyebrow {
  color: var(--blue);
  margin-bottom: 10px;
}
.quiz h2 {
  font: 400 25px/1.35 var(--serif);
  margin: 0 0 19px;
}
.quiz fieldset {
  border: 0;
  margin: 0;
  padding: 0;
}
.quiz legend {
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 12px;
}
.quiz label {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid transparent;
  border-radius: 4px;
  padding: 12px 14px;
  font-size: 13px;
  margin: 8px 0;
  cursor: pointer;
}
.quiz label:has(input:checked) {
  border-color: var(--blue);
  background: white;
}
.quiz input {
  margin-top: 4px;
  accent-color: var(--blue);
}
.quiz button {
  margin-top: 12px;
}
.quiz-feedback {
  font-size: 13px;
  margin-top: 17px;
  padding-top: 15px;
  border-top: 1px solid #b6cbed;
}
.quiz-feedback:empty {
  display: none;
}
.sources {
  border-top: 1px solid var(--line);
  padding-top: 23px;
  margin-top: 38px;
}
.sources h2 {
  font-size: 12px;
  font-family: var(--sans);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}
.sources ol {
  padding-left: 19px;
  line-height: 1.6;
  font-size: 12px;
}
.sources li {
  margin: 7px 0;
}
.sources a {
  overflow-wrap: anywhere;
}
.chapter-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin: 35px 0;
  padding: 25px 0;
  border-top: 1px solid var(--line);
}
.next-link {
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
}
.mark-read {
  font-size: 12px;
}
.mark-read[aria-pressed="true"] {
  background: var(--pale-green);
  color: var(--green);
  border-color: #8fb09a;
}
.book-footer {
  border-top: 1px solid var(--line);
  padding-top: 23px;
  display: flex;
  gap: 28px;
  justify-content: space-between;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.7;
}
.book-footer p {
  max-width: 380px;
  margin: 0;
}
.book-footer strong {
  color: var(--ink);
}
.book-footer .text-button {
  font-size: 10px;
}
.author-credit {
  flex-basis: 100%;
  max-width: none !important;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.2px;
}
.inline-link {
  white-space: nowrap;
}
details {
  border-top: 1px solid var(--line);
  padding: 15px 0;
}
summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 14px;
}
details p {
  font-size: 14px;
  margin: 13px 0 0 !important;
  color: var(--muted);
}
dialog {
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 30px;
  max-width: 490px;
  background: var(--paper);
  color: var(--ink);
}
dialog::backdrop {
  background: #172e46aa;
}
dialog h2 {
  font: 28px var(--serif);
  margin: 0 0 18px;
}
dialog p {
  font-size: 14px;
}
.dialog-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 25px;
}
.noscript {
  position: fixed;
  inset: 100px 10%;
  padding: 40px;
  background: var(--paper);
  z-index: 10;
  border: 1px solid var(--line);
}
@media (min-width: 1450px) {
  main {
    padding-left: 85px;
    padding-right: 85px;
  }
  .book-layout {
    grid-template-columns: 295px minmax(0, 1fr);
  }
  .sidebar {
    padding-left: 48px;
  }
}
@media (max-width: 1100px) {
  main {
    padding: 40px 35px;
  }
  .masthead {
    padding: 22px 30px;
  }
  .book-layout {
    grid-template-columns: 235px minmax(0, 1fr);
  }
  .sidebar {
    padding: 30px 18px;
  }
  .three-columns {
    grid-template-columns: 1fr;
  }
  .three-columns .concept-card {
    display: grid;
    grid-template-columns: 25px 160px 1fr;
    gap: 12px;
    align-items: baseline;
  }
  .three-columns .concept-card h3 {
    margin: 0;
  }
  .hero-art .art-label {
    font-size: 10px;
  }
}
@media (max-width: 760px) {
  body {
    font-size: 15px;
  }
  .masthead {
    padding: 17px 20px;
  }
  .edition {
    display: none;
  }
  .utility-links {
    display: none;
  }
  .book-layout {
    display: block;
  }
  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 18px 20px;
  }
  .sidebar-inner {
    position: static;
  }
  .sidebar nav .eyebrow,
  .sidebar .progress-card,
  .sidebar .support-link,
  .sidebar .support-routes,
  .sidebar #reset-progress,
  .storage-status {
    display: none;
  }
  .search-label {
    font-size: 9px;
  }
  .search-field {
    margin: 2px 0 12px;
  }
  .search-field input {
    font-size: 13px;
  }
  #chapter-list {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    padding-bottom: 3px;
  }
  #chapter-list li {
    flex: 0 0 auto;
    margin: 0;
  }
  #chapter-list a {
    display: flex;
    gap: 7px;
    padding: 7px 10px;
    font-size: 11px;
  }
  #chapter-list a .nav-title {
    display: none;
  }
  #chapter-list a[aria-current="page"] .nav-title {
    display: inline;
  }
  .read-tick {
    display: none;
  }
  main {
    padding: 30px 22px;
  }
  .chapter-kicker {
    font-size: 9px;
    gap: 12px;
  }
  h1 {
    font-size: 45px;
    letter-spacing: -1.4px;
  }
  .standfirst {
    font-size: 18px;
  }
  .reading-meta {
    font-size: 9px;
    gap: 12px;
  }
  .hero-art {
    margin-top: 25px;
  }
  .concept-grid,
  .chapter-map {
    grid-template-columns: 1fr;
  }
  .three-columns .concept-card {
    display: block;
  }
  .three-columns .concept-card h3 {
    margin: 10px 0;
  }
  .content-section h2 {
    font-size: 28px;
  }
  .content-section {
    margin: 33px 0;
  }
  .quote {
    font-size: 22px;
  }
  .diagram-body {
    padding: 17px;
  }
  .diagram-head {
    padding: 13px 17px;
  }
  .diagram-head h3 {
    font-size: 12px;
  }
  .sim-label {
    font-size: 8px;
  }
  .state-node {
    padding: 13px 2px;
    font-size: 10px;
  }
  .state-arrow {
    font-size: 10px;
  }
  .lifecycle-track {
    gap: 4px;
  }
  .data-stores,
  .release-track {
    gap: 10px;
  }
  .release-card,
  .data-store {
    padding: 12px;
  }
  .quiz {
    padding: 22px 18px;
  }
  .chapter-actions {
    align-items: flex-start;
  }
  .book-footer {
    display: block;
  }
  .book-footer p + p {
    margin-top: 15px;
  }
  .author-credit {
    margin-top: 15px !important;
  }
  .hero-art .art-label {
    font-size: 9px;
  }
  .network-option {
    font-size: 12px;
  }
  .diagram .controls button {
    font-size: 11px;
    padding: 8px 10px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}
@media (max-width: 760px) {
  .diagram-svg { min-width: 620px; }
  .mobile-diagram-hint { display: block; font-size: 11px; color: var(--muted); }
  .hero-art .art-label { font-size: 11px; }
}
@media (max-width: 760px) {
  .sidebar #reset-progress {
    display: inline-block !important;
    margin-top: 10px;
  }
  .storage-status:not(:empty) {
    display: block;
  }
}
@media print {
  .mobile-diagram-hint { display: none; }
  .diagram-svg { min-width: 0; }
  @page {
    margin: 16mm;
  }
  body {
    background: #fff;
    font-size: 10pt;
    color: #000;
  }
  .masthead {
    padding: 0 0 12px;
  }
  .masthead .offline-badge,
  .sidebar,
  .skip-link,
  .route-selector,
  .diagram .controls,
  .quiz button,
  .chapter-actions,
  .book-footer button,
  .network-option {
    display: none !important;
  }
  .book-layout {
    display: block;
  }
  main {
    padding: 22px 0;
    max-width: none;
  }
  .edition {
    display: block;
  }
  h1 {
    font-size: 34pt;
  }
  .chapter-kicker {
    margin-bottom: 18px;
  }
  .content-section {
    margin: 24px 0;
  }
  .hero-art,
  .diagram,
  .concept-card,
  .quiz,
  .route-detail {
    break-inside: avoid;
  }
  .hero-art,
  .quiz,
  .diagram {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
  .content-section h2 {
    break-after: avoid;
    font-size: 20pt;
  }
  .standfirst {
    font-size: 13pt;
  }
  .sources {
    font-size: 9pt;
  }
  .sources a::after {
    content: " (" attr(href) ")";
    font-size: 8pt;
  }
  .book-footer {
    display: block;
  }
  .book-footer p {
    max-width: none;
  }
  .book-footer p + p {
    margin-top: 8px;
  }
  a {
    color: #172e46;
  }
  details {
    break-inside: avoid;
  }
  .dialog-actions,
  dialog {
    display: none;
  }
  .chapter-map a {
    padding: 14px;
  }
  .three-columns {
    grid-template-columns: repeat(3, 1fr);
  }
  .three-columns .concept-card {
    display: block;
  }
  .three-columns .concept-card h3 {
    margin: 8px 0;
  }
  .quiz label {
    padding: 8px;
  }
  .terminal {
    font-size: 9pt;
  }
  .diagram-caption {
    font-size: 9pt;
  }
}