:root {
  color-scheme: light;
  --bg: #f7f4ed;
  --surface: #fffdf8;
  --surface-alt: #edf4f2;
  --border: #d8d2c5;
  --text: #25231f;
  --muted: #6d675c;
  --accent: #1d6f78;
  --accent-strong: #15515a;
  --focus: #b35f2a;
  --shadow: 0 18px 40px rgba(36, 31, 24, 0.12);
  --reader-size: 19px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #171814;
  --surface: #22231e;
  --surface-alt: #1d2927;
  --border: #3d3c34;
  --text: #f1ecdf;
  --muted: #b8b09e;
  --accent: #79c5bd;
  --accent-strong: #a6ddd7;
  --focus: #e1a15d;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  overflow-x: hidden;
}

body.landing-page {
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--bg) 76%, #ffffff) 0%, var(--surface-alt) 48%, color-mix(in srgb, var(--accent) 10%, var(--bg)) 100%);
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 68px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(12px);
}

.brand {
  min-width: 0;
  flex: 1;
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.25;
}

.brand-subtitle {
  margin-top: 2px;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-actions,
.reader-actions,
.chapter-picker {
  display: flex;
  align-items: center;
  gap: 8px;
}

.select-label {
  color: var(--muted);
  font-size: 13px;
}

.select-control,
.search-input {
  min-height: 38px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
}

.select-control {
  padding: 0 34px 0 10px;
}

.search-input {
  width: 100%;
  padding: 0 12px;
}

.icon-button,
.text-button {
  min-height: 38px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

.icon-button {
  min-width: 40px;
  padding: 0 10px;
}

.text-button {
  padding: 0 12px;
}

.topbar-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.topbar-link.active {
  border-color: var(--accent);
  background: var(--surface-alt);
  color: var(--accent-strong);
}

.reader-mode-select[hidden] {
  display: none;
}

.icon-button:hover,
.text-button:hover,
.book-button:hover,
.chapter-link:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.icon-button:focus-visible,
.text-button:focus-visible,
.book-button:focus-visible,
.chapter-link:focus-visible,
.select-control:focus-visible,
.search-input:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 35%, transparent);
  outline-offset: 2px;
}

.workspace {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  min-height: 0;
}

body.landing-page .workspace {
  display: block;
}

body.landing-page .reader-toolbar,
body.quiz-page .reader-toolbar,
body.landing-page .sidebar {
  display: none;
}

body.quiz-page .workspace {
  display: block;
}

body.quiz-page .sidebar {
  display: none;
}

.sidebar {
  position: sticky;
  top: 68px;
  height: calc(100vh - 68px);
  border-right: 1px solid var(--border);
  background: var(--surface);
  overflow: auto;
}

.sidebar-header {
  position: sticky;
  top: 0;
  z-index: 2;
  padding: 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.book-list {
  display: grid;
  gap: 2px;
  padding: 8px;
}

.book-button {
  width: 100%;
  min-height: 38px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  text-align: left;
  cursor: pointer;
}

.book-button.active {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  background: var(--surface-alt);
  color: var(--accent-strong);
  font-weight: 700;
}

.reader-shell {
  min-width: 0;
  display: grid;
  grid-template-rows: auto 1fr;
}

.reader-toolbar {
  position: sticky;
  top: 68px;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter: blur(12px);
}

.reader {
  width: min(100%, 980px);
  margin: 0 auto;
  padding: 34px 28px 72px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: var(--reader-size);
  line-height: 1.72;
}

.reader:focus {
  outline: none;
}

.reader h1,
.reader h2,
.reader h3 {
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.2;
}

.reader h1 {
  margin: 0 0 10px;
  font-size: 32px;
}

.reader h2 {
  margin: 34px 0 12px;
  font-size: 23px;
}

.reader h3 {
  margin: 28px 0 10px;
  font-size: 20px;
}

.reader p {
  margin: 0 0 18px;
}

.reader-parallel {
  width: min(100%, 1480px);
}

.parallel-reader {
  display: grid;
  gap: 18px;
}

.parallel-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 20px;
  padding: 16px 0;
  border-top: 1px solid var(--border);
}

.parallel-cell {
  min-width: 0;
}

.parallel-cell-en {
  color: var(--muted);
}

.parallel-cell p:last-child,
.parallel-cell blockquote:last-child,
.parallel-cell ul:last-child {
  margin-bottom: 0;
}

.reader-meta {
  margin-bottom: 24px;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
}

.reader-source-note {
  margin: 28px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 13px;
  line-height: 1.55;
}

.reader-source-note a {
  color: var(--accent);
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(82px, 1fr));
  gap: 8px;
  margin: 18px 0 30px;
}

.chapter-link {
  min-height: 38px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  text-align: center;
  cursor: pointer;
}

.chapter-link.active {
  border-color: var(--accent);
  background: var(--surface-alt);
  color: var(--accent-strong);
  font-weight: 700;
}

.chapter-flowchart {
  margin: 0 0 32px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

.chapter-flowchart details {
  padding: 0;
}

.chapter-flowchart summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
  color: var(--accent-strong);
  cursor: pointer;
  font-weight: 700;
}

.flowchart-count {
  color: var(--muted);
  font-size: 13px;
  font-weight: 400;
}

.flowchart-scroll {
  margin: 0 0 18px;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.flowchart-scroll:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 35%, transparent);
  outline-offset: 2px;
}

.flowchart-svg {
  display: block;
  width: 100%;
  min-width: 420px;
  height: auto;
}

.flowchart-node rect {
  fill: var(--surface-alt);
  stroke: color-mix(in srgb, var(--accent) 50%, var(--border));
  stroke-width: 1.5;
}

.flowchart-node-label {
  fill: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 15px;
  font-weight: 700;
}

.flowchart-edge line {
  stroke: var(--accent);
  stroke-width: 2;
}

.flowchart-svg marker path {
  fill: var(--accent);
}

.flowchart-edge-label-bg {
  fill: var(--surface);
  stroke: var(--border);
}

.flowchart-edge-label {
  fill: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 12px;
}

.chapter-quiz {
  margin-top: 44px;
  border-top: 1px solid var(--border);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

.chapter-quiz details {
  margin-top: 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.chapter-quiz summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 54px;
  padding: 0 18px;
  color: var(--accent-strong);
  font-weight: 700;
  cursor: pointer;
}

.quiz-count,
.quiz-question-meta,
.quiz-score {
  color: var(--muted);
  font-size: 13px;
  font-weight: 400;
}

.quiz-body {
  padding: 0 18px 18px;
}

.quiz-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.quiz-question {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--surface) 88%, var(--bg));
}

.quiz-prompt {
  margin: 6px 0 12px;
  color: var(--text);
  font-weight: 700;
}

.quiz-choices {
  display: grid;
  gap: 8px;
}

.quiz-choice {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: start;
  gap: 10px;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

.quiz-choice input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.quiz-choice-letter {
  display: inline-grid;
  place-items: center;
  width: 28px;
  min-height: 28px;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.quiz-choice:has(input:checked) {
  border-color: var(--accent);
  background: var(--surface-alt);
}

.quiz-choice.is-correct-answer {
  border-color: color-mix(in srgb, #1f8a4c 70%, var(--border));
}

.quiz-choice.is-wrong-answer {
  border-color: color-mix(in srgb, #b84235 70%, var(--border));
}

.quiz-feedback {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.quiz-question.is-correct .quiz-feedback {
  color: #1f8a4c;
}

.quiz-question.is-incorrect .quiz-feedback,
.quiz-question.is-unanswered .quiz-feedback {
  color: #b84235;
}

.quiz-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
}

.quiz-score {
  margin: 0;
}

.empty-state {
  padding-top: 24px;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
}

.global-quiz-reader {
  width: min(100%, 1180px);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

.global-quiz-header {
  max-width: 760px;
  margin-bottom: 24px;
}

.global-quiz-header h1 {
  margin-bottom: 12px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 38px;
}

.global-quiz-header p:last-child {
  color: var(--muted);
}

.global-quiz-setup {
  display: grid;
  grid-template-columns: minmax(220px, 0.45fr) minmax(180px, 0.28fr);
  gap: 16px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.global-control {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.global-book-picker,
.global-quiz-start-row {
  grid-column: 1 / -1;
}

.global-book-picker {
  display: grid;
  gap: 12px;
}

.global-book-picker-header,
.global-book-actions,
.global-quiz-start-row,
.global-quiz-meta {
  display: flex;
  align-items: center;
  gap: 10px;
}

.global-book-picker-header {
  justify-content: space-between;
}

.global-book-picker h2 {
  margin: 0;
  font-size: 18px;
}

.global-book-options {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 8px;
  max-height: 280px;
  overflow: auto;
  padding: 2px;
}

.global-book-option {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: color-mix(in srgb, var(--surface) 90%, var(--bg));
  color: var(--text);
  cursor: pointer;
}

.global-book-option span {
  min-width: 0;
  overflow-wrap: anywhere;
}

.global-book-count {
  color: var(--muted);
  font-size: 12px;
}

.global-quiz-message {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.global-quiz-session {
  margin-top: 24px;
}

.global-quiz-meta {
  justify-content: space-between;
  flex-wrap: wrap;
}

.quiz-source {
  color: var(--accent-strong);
  text-decoration: none;
}

.quiz-source:hover {
  text-decoration: underline;
}

body.landing-page .reader {
  width: 100%;
  margin: 0;
  padding: 0;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 17px;
  line-height: 1.62;
}

.landing-hero {
  position: relative;
  min-height: calc(100vh - 68px);
  display: grid;
  align-items: center;
  overflow: hidden;
  padding: clamp(56px, 8vw, 112px) clamp(18px, 6vw, 78px);
  background:
    linear-gradient(90deg, rgba(22, 24, 20, 0.96) 0%, rgba(22, 24, 20, 0.9) 48%, rgba(22, 24, 20, 0.62) 76%, rgba(22, 24, 20, 0.48) 100%),
    #171814;
  color: #f8f1e3;
}

.landing-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 36px 36px;
  mix-blend-mode: screen;
}

.landing-hero-copy {
  position: relative;
  z-index: 3;
  width: min(100%, 700px);
  min-width: 0;
  overflow-wrap: anywhere;
}

.landing-eyebrow,
.landing-section-kicker {
  margin: 0 0 14px;
  color: #d7b36b;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.landing-hero h1 {
  max-width: 12ch;
  margin: 0;
  color: #fff8ea;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 76px;
  line-height: 0.96;
}

.landing-intro {
  max-width: 700px;
  margin: 26px 0 0;
  color: #eee2c9;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 28px;
  line-height: 1.38;
}

.landing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
  min-width: 0;
}

.landing-button,
.landing-start-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  min-width: 0;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 0 18px;
  color: inherit;
  font-weight: 700;
  text-decoration: none;
  overflow-wrap: anywhere;
  white-space: normal;
}

.landing-button-primary {
  background: #d7b36b;
  color: #1d1a14;
}

.landing-button-secondary {
  border-color: rgba(248, 241, 227, 0.42);
  background: rgba(255, 255, 255, 0.08);
  color: #fff8ea;
}

.landing-button-quiz {
  border-color: rgba(215, 179, 107, 0.76);
  background: rgba(215, 179, 107, 0.16);
}

.landing-button:hover,
.landing-start-link:hover {
  transform: translateY(-1px);
}

.landing-portrait {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  width: min(46vw, 620px);
  margin: 0;
  text-align: center;
}

.landing-portrait img {
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 0;
  object-fit: cover;
  object-position: center;
  opacity: 0.58;
  filter: grayscale(100%) sepia(12%);
}

.landing-portrait figcaption {
  position: absolute;
  right: 24px;
  bottom: 22px;
  margin: 0;
  color: rgba(248, 241, 227, 0.72);
  font-size: 13px;
}

.landing-section {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(280px, 0.64fr);
  gap: clamp(24px, 5vw, 70px);
  padding: clamp(48px, 7vw, 86px) clamp(18px, 6vw, 78px);
  border-top: 1px solid var(--border);
}

.landing-section-text {
  max-width: 790px;
}

.landing-section h2 {
  margin: 0;
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 44px;
  line-height: 1.08;
}

.landing-section p {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 19px;
}

.landing-value-list {
  display: grid;
  align-content: start;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.landing-value-list li,
.landing-start-link {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  box-shadow: 0 14px 34px rgba(36, 31, 24, 0.08);
}

.landing-value-list li {
  position: relative;
  padding: 18px 18px 18px 42px;
  color: var(--text);
}

.landing-value-list li::before {
  content: "+";
  position: absolute;
  margin-left: -24px;
  color: var(--accent-strong);
  font-weight: 700;
}

.landing-daily-quote {
  position: relative;
  z-index: 3;
  width: min(100%, 660px);
  margin: 0 0 30px;
  padding-left: 18px;
  border-left: 3px solid #d7b36b;
  color: #f8f1e3;
}

.landing-quote-inner {
  min-width: 0;
}

.landing-quote-text {
  margin: 0;
  padding: 0;
  border: 0;
}

.landing-quote-text p {
  margin: 0;
  color: #fff8ea;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 21px;
  line-height: 1.38;
}

.landing-quote-source {
  display: inline-flex;
  margin-top: 12px;
  color: #d7b36b;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

.landing-quote-source:hover {
  text-decoration: underline;
}

.landing-quiz-promo {
  grid-template-columns: minmax(0, 0.7fr) minmax(260px, 0.52fr);
  background: color-mix(in srgb, var(--surface) 78%, var(--surface-alt));
}

.landing-quiz-cta {
  margin-top: 28px;
  color: #1d1a14;
}

.landing-quiz-preview {
  display: grid;
  align-content: center;
  gap: 18px;
  border: 1px solid var(--border);
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--surface) 96%, transparent),
    color-mix(in srgb, var(--surface-alt) 72%, var(--surface))
  );
  padding: 20px;
  box-shadow: 0 18px 44px rgba(36, 31, 24, 0.1);
}

.landing-quiz-list {
  display: grid;
  align-content: center;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.landing-quiz-list li {
  min-height: 0;
  display: flex;
  align-items: center;
  border: 1px solid color-mix(in srgb, var(--border) 78%, transparent);
  background: color-mix(in srgb, var(--surface) 72%, transparent);
  padding: 10px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 12px;
  line-height: 1.35;
}

.landing-quiz-sample {
  border: 0;
  background: transparent;
  padding: 0;
  box-shadow: none;
}

.landing-sample-meta {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.landing-sample-prompt {
  margin: 14px 0;
  color: var(--heading);
  font-size: 20px;
  line-height: 1.45;
}

.landing-sample-choices {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.landing-sample-choice {
  width: 100%;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  align-items: start;
  gap: 10px;
  border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  padding: 10px;
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  line-height: 1.4;
  text-align: left;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.landing-sample-choice:hover,
.landing-sample-choice:focus-visible {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
  outline: none;
}

.landing-sample-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
}

.landing-sample-choice.is-correct-answer {
  border-color: #2f7d52;
  background: color-mix(in srgb, #2f7d52 13%, var(--surface));
}

.landing-sample-choice.is-wrong-answer {
  border-color: #a94f3f;
  background: color-mix(in srgb, #a94f3f 12%, var(--surface));
}

.landing-sample-feedback {
  min-height: 42px;
  margin: 12px 0 0;
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
}

.landing-starts {
  grid-template-columns: minmax(0, 0.7fr) minmax(0, 1fr);
  background: color-mix(in srgb, var(--surface-alt) 70%, var(--bg));
}

.landing-start-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.landing-start-link {
  min-height: 76px;
  color: var(--accent-strong);
  font-size: 18px;
}

:root[data-theme="dark"] body.landing-page {
  background:
    linear-gradient(135deg, #171814 0%, #1d2927 48%, #232017 100%);
}

:root[data-theme="dark"] .landing-value-list li,
:root[data-theme="dark"] .landing-quiz-list li,
:root[data-theme="dark"] .landing-start-link {
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.22);
}

@media (max-width: 980px) {
  .landing-hero {
    min-height: auto;
    padding: 42px 20px 390px;
    background:
      linear-gradient(180deg, rgba(22, 24, 20, 0.96) 0%, rgba(22, 24, 20, 0.86) 55%, rgba(22, 24, 20, 0.34) 100%),
      #171814;
  }

  .landing-hero h1 {
    max-width: 11ch;
    font-size: 54px;
  }

  .landing-intro {
    font-size: 23px;
  }

  .landing-portrait {
    top: auto;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 390px;
    transform: none;
  }

  .landing-portrait img {
    object-fit: contain;
    object-position: center bottom;
    opacity: 0.54;
  }

  .landing-portrait figcaption {
    right: 20px;
    bottom: 16px;
  }

  .landing-section,
  .landing-quiz-promo,
  .landing-starts {
    grid-template-columns: minmax(0, 1fr);
    padding: 44px 20px;
  }

  .landing-section h2 {
    font-size: 36px;
  }

  .landing-quote-text p {
    font-size: 20px;
  }
}

@media (max-width: 560px) {
  body.landing-page .topbar {
    position: static;
  }

  body.landing-page .brand-subtitle {
    max-width: 34ch;
    line-height: 1.3;
    white-space: normal;
  }

  .landing-hero {
    align-items: start;
    min-height: auto;
    padding: 28px 16px 0;
  }

  .landing-hero-copy {
    display: grid;
  }

  .landing-daily-quote {
    margin-bottom: 22px;
    padding-left: 14px;
  }

  .landing-eyebrow {
    margin: 0 0 18px;
    font-size: 11px;
    line-height: 1.3;
  }

  .landing-hero-copy,
  .landing-intro {
    width: 100%;
    max-width: none;
  }

  .landing-hero h1 {
    max-width: none;
    margin: 0 0 18px;
    font-size: clamp(36px, 10vw, 40px);
    line-height: 1.06;
  }

  .landing-intro {
    margin: 0;
    font-size: 18px;
    line-height: 1.45;
  }

  .landing-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
    margin-top: 28px;
  }

  .landing-button {
    width: 100%;
    min-height: 48px;
    min-width: 0;
    padding: 10px 12px;
    font-size: 16px;
    text-align: center;
  }

  .landing-button-secondary {
    background: rgba(22, 24, 20, 0.82);
  }

  .landing-portrait {
    position: relative;
    left: auto;
    right: auto;
    bottom: auto;
    z-index: 2;
    width: calc(100% + 32px);
    height: 172px;
    margin: 30px -16px 0;
    overflow: hidden;
  }

  .landing-portrait img {
    border: 0;
    border-radius: 0;
    object-fit: cover;
    object-position: center 27%;
    opacity: 0.42;
    box-shadow: none;
  }

  .landing-portrait figcaption {
    display: none;
  }

  .landing-section,
  .landing-quiz-promo,
  .landing-starts {
    gap: 22px;
    padding: 36px 16px;
  }

  .landing-section h2 {
    font-size: 28px;
    line-height: 1.14;
  }

  .landing-section p {
    margin-top: 16px;
    font-size: 17px;
    line-height: 1.55;
  }

  .landing-quote-text p {
    margin: 0;
    font-size: 17px;
    line-height: 1.42;
  }

  .landing-quote-source {
    margin-top: 10px;
    font-size: 12px;
  }

  .landing-value-list {
    gap: 10px;
  }

  .landing-value-list li {
    padding: 14px 14px 14px 36px;
  }

  .landing-quiz-cta {
    width: 100%;
    margin-top: 22px;
  }

  .landing-quiz-preview {
    padding: 14px;
  }

  .landing-quiz-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .landing-quiz-list li {
    padding: 12px 14px;
  }

  .landing-quiz-sample {
    padding: 0;
  }

  .landing-sample-meta {
    display: grid;
    gap: 4px;
  }

  .landing-sample-prompt {
    font-size: 17px;
  }

  .landing-start-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .landing-start-link {
    min-height: 56px;
    padding: 0 14px;
    font-size: 16px;
  }
}

.mobile-only {
  display: none;
}

.nav-backdrop {
  display: none;
}

.dialog-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(0, 0, 0, 0.42);
}

.contact-dialog {
  position: fixed;
  top: 50%;
  left: 50%;
  z-index: 60;
  width: min(calc(100vw - 32px), 520px);
  transform: translate(-50%, -50%);
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 28px;
  color: var(--text);
}

.contact-close {
  position: absolute;
  top: 14px;
  right: 14px;
}

.contact-kicker {
  margin: 0 0 8px;
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.contact-dialog h2 {
  margin: 0;
  padding-right: 48px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 30px;
  line-height: 1.16;
}

.contact-copy,
.contact-note {
  color: var(--muted);
}

.contact-copy {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.55;
}

.contact-address-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  margin-top: 20px;
}

.contact-address {
  display: flex;
  align-items: center;
  min-width: 0;
  min-height: 42px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-alt);
  padding: 0 12px;
  color: var(--accent-strong);
  font-family: Consolas, "Liberation Mono", monospace;
  font-size: 15px;
  overflow-wrap: anywhere;
}

.contact-note {
  min-height: 20px;
  margin: 12px 0 0;
  font-size: 14px;
}

@media (max-width: 820px) {
  .mobile-only {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .topbar {
    gap: 10px;
    padding: 10px 12px;
  }

  .topbar-actions {
    flex: 0 0 auto;
  }

  #contactButton {
    min-width: 0;
    padding: 0 10px;
  }

  #globalQuizLink {
    min-width: 0;
    padding: 0 10px;
  }

  .icon-button {
    min-width: 38px;
  }

  .brand-title {
    font-size: 16px;
  }

  .select-label {
    display: none;
  }

  .workspace {
    display: block;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 40;
    width: min(86vw, 340px);
    height: 100vh;
    transform: translateX(-100%);
    transition: transform 160ms ease;
    box-shadow: var(--shadow);
  }

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

  body.nav-open .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 30;
    background: rgba(0, 0, 0, 0.35);
  }

  .reader-toolbar {
    position: static;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 12px;
  }

  .chapter-picker,
  .reader-actions {
    width: 100%;
  }

  .chapter-picker .select-control {
    min-width: 0;
    flex: 1;
  }

  .reader-actions {
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .reader {
    width: 100%;
    max-width: 100vw;
    padding: 24px 16px 56px;
    font-size: calc(var(--reader-size) - 1px);
  }

  .flowchart-svg {
    min-width: 390px;
  }

  .reader h1 {
    font-size: 26px;
  }

  .global-quiz-reader {
    font-size: 16px;
  }

  .global-quiz-setup {
    grid-template-columns: minmax(0, 1fr);
    padding: 14px;
  }

  .global-book-picker-header,
  .global-quiz-start-row {
    align-items: stretch;
    flex-direction: column;
  }

  .global-book-actions {
    flex-wrap: wrap;
  }
}

@media (max-width: 520px) {
  html,
  body,
  .app-shell,
  .workspace,
  .reader-shell,
  .reader-toolbar,
  .reader {
    max-width: 100vw;
    overflow-x: hidden;
  }

  .topbar {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 8px;
    width: 100vw;
    max-width: 100vw;
  }

  .brand {
    min-width: 0;
  }

  .topbar-actions {
    grid-column: 1 / -1;
    flex-wrap: wrap;
    justify-content: start;
    min-width: 0;
  }

  #languageSelect {
    width: 150px;
    max-width: 150px;
  }

  #themeToggle {
    display: none;
  }

  .chapter-picker {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.7fr);
  }

  .reader-actions {
    display: grid;
    grid-template-columns: repeat(4, 40px);
    align-items: center;
    justify-content: start;
    gap: 6px;
  }

  .reader-actions.has-reader-mode {
    grid-template-columns: minmax(0, 104px) repeat(4, 40px);
  }

  .reader-actions .text-button,
  .reader-actions .icon-button {
    min-width: 0;
    width: 40px;
    padding: 0;
  }

  .reader-mode-select {
    min-width: 0;
    width: 100%;
  }

  .nav-toggle-button,
  #prevButton,
  #nextButton {
    font-size: 0;
  }

  .nav-toggle-button::before,
  #prevButton::before,
  #nextButton::before {
    font-size: 18px;
    line-height: 1;
  }

  .nav-toggle-button::before {
    content: "|||";
    display: block;
    letter-spacing: 0;
    transform: rotate(90deg);
  }

  #prevButton::before {
    content: "<";
  }

  #nextButton::before {
    content: ">";
  }

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

  .chapter-link,
  .select-control {
    min-width: 0;
    width: 100%;
  }

  .parallel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .contact-dialog {
    padding: 24px 18px;
  }

  .contact-address-row {
    grid-template-columns: minmax(0, 1fr);
  }

  .global-book-options {
    grid-template-columns: minmax(0, 1fr);
    max-height: 360px;
  }

  .global-quiz-header h1 {
    font-size: 30px;
  }
}