:root {
  --paper: #f6f1e8;
  --paper-soft: #fbf8f2;
  --paper-deep: #ece5d9;
  --ink: #1d2118;
  --ink-soft: #5d6254;
  --olive: #343a25;
  --olive-2: #4d5634;
  --lime: #c9e66d;
  --lime-soft: #e8f3bd;
  --terracotta: #a9472f;
  --terracotta-soft: #f6ded5;
  --blue: #315c74;
  --blue-soft: #dce9ef;
  --violet: #594671;
  --violet-soft: #e9e2f2;
  --amber: #73501c;
  --amber-soft: #f3e7c8;
  --green: #426d4f;
  --green-soft: #dceadf;
  --border: #d9d2c6;
  --border-strong: #bbb4a8;
  --danger: #aa4939;
  --shadow: 4px 5px 0 rgba(29, 33, 24, 0.12);
  --shadow-soft: 0 12px 30px rgba(29, 33, 24, 0.08);
  --radius: 10px;
  --topbar-height: 72px;
  --rail-width: 278px;
  --context-width: 270px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-display: Georgia, "Songti SC", "STSong", serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

[id] {
  scroll-margin-top: calc(var(--topbar-height) + 12px);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 86% -5%, rgba(201, 230, 109, 0.22), transparent 26rem),
    var(--paper);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.menu-open,
body.search-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

button,
input,
select,
textarea {
  color: inherit;
  font: inherit;
}

button,
select {
  cursor: pointer;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--terracotta);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 8px;
  padding: 8px 12px;
  transform: translateY(-150%);
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--lime);
  font-weight: 700;
}

.skip-link:focus {
  transform: translateY(0);
}

.topbar {
  position: sticky;
  z-index: 50;
  top: 0;
  display: flex;
  height: var(--topbar-height);
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  overflow: hidden;
  border: 1px solid #262b1e;
  border-radius: 9px;
  background: var(--olive);
  box-shadow: 3px 3px 0 var(--lime);
}

.brand-mark i {
  position: absolute;
  width: 22px;
  height: 3px;
  border-radius: 2px;
  background: var(--lime);
  transform-origin: center;
}

.brand-mark i:first-child {
  transform: translateY(-7px);
}

.brand-mark i:nth-child(2) {
  width: 17px;
}

.brand-mark i:last-child {
  transform: translateY(7px);
  width: 11px;
}

.brand-copy {
  display: flex;
  line-height: 1.2;
  flex-direction: column;
}

.brand-copy strong {
  font-size: 16px;
  letter-spacing: 0.03em;
}

.brand-copy small {
  margin-top: 3px;
  color: var(--ink-soft);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-trigger {
  display: flex;
  min-width: 250px;
  height: 42px;
  align-items: center;
  gap: 9px;
  padding: 0 10px 0 13px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  color: var(--ink-soft);
  background: var(--paper-soft);
  text-align: left;
}

.search-trigger:hover {
  border-color: var(--olive);
  color: var(--ink);
}

kbd {
  display: inline-grid;
  min-width: 24px;
  height: 23px;
  margin-left: auto;
  place-items: center;
  border: 1px solid var(--border);
  border-bottom-color: var(--border-strong);
  border-radius: 5px;
  background: var(--paper-deep);
  font: 12px/1 var(--font-sans);
}

.top-link,
.progress-pill {
  display: inline-grid;
  height: 40px;
  place-items: center;
  padding: 0 14px;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.top-link:hover {
  background: var(--paper-deep);
}

.progress-pill {
  min-width: 56px;
  border: 1px solid var(--olive);
  color: var(--lime);
  background: var(--olive);
}

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--border-strong);
  border-radius: 7px;
  background: transparent;
}

.menu-button span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 2px;
  background: var(--ink);
}

.app-shell {
  display: grid;
  min-height: calc(100vh - var(--topbar-height));
  grid-template-columns: var(--rail-width) minmax(0, 1fr) var(--context-width);
}

.course-rail {
  position: sticky;
  top: var(--topbar-height);
  display: flex;
  height: calc(100vh - var(--topbar-height));
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--border);
  background: rgba(251, 248, 242, 0.66);
}

.rail-intro {
  padding: 22px 20px 16px;
  border-bottom: 1px solid var(--border);
}

.rail-kicker,
.eyebrow {
  margin: 0 0 6px;
  color: var(--terracotta);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.rail-intro > p:last-child {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 0;
}

.rail-intro strong {
  font-size: 17px;
}

.rail-intro span {
  color: var(--ink-soft);
  font-size: 12px;
}

.course-nav {
  flex: 1;
  overflow: auto;
  padding: 12px 10px 20px;
  scrollbar-color: var(--border-strong) transparent;
  scrollbar-width: thin;
}

.stage-group + .stage-group {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.stage-label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 8px 6px;
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.04em;
}

.stage-label span:first-child {
  display: inline-grid;
  width: 21px;
  height: 21px;
  place-items: center;
  border-radius: 50%;
  color: var(--paper-soft);
  background: var(--olive);
  font-size: 10px;
}

.chapter-nav-link {
  display: grid;
  min-height: 42px;
  grid-template-columns: 26px minmax(0, 1fr) 30px;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  border: 1px solid transparent;
  border-radius: 7px;
  color: var(--ink-soft);
  text-decoration: none;
}

.chapter-nav-link:hover {
  color: var(--ink);
  background: var(--paper-deep);
}

.chapter-nav-link.active {
  border-color: var(--olive);
  color: var(--ink);
  background: var(--lime-soft);
  box-shadow: 2px 2px 0 var(--olive);
}

.chapter-number {
  color: var(--terracotta);
  font: 600 14px/1 var(--font-display);
}

.chapter-nav-title {
  overflow: hidden;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chapter-nav-progress {
  color: var(--ink-soft);
  font-size: 10px;
  text-align: right;
}

.rail-footer {
  display: grid;
  gap: 2px;
  padding: 12px;
  border-top: 1px solid var(--border);
}

.rail-footer a,
.rail-footer button {
  display: flex;
  min-height: 36px;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border: 0;
  border-radius: 6px;
  color: var(--ink-soft);
  background: transparent;
  font-size: 12px;
  text-align: left;
  text-decoration: none;
}

.rail-footer a:hover,
.rail-footer button:hover {
  color: var(--ink);
  background: var(--paper-deep);
}

.rail-skeleton {
  height: 38px;
  margin: 6px 4px;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--paper-deep), var(--paper-soft), var(--paper-deep));
  background-size: 200% 100%;
  animation: shimmer 1.6s infinite;
}

.rail-skeleton.short {
  width: 70%;
}

.main-content {
  width: min(100%, 960px);
  min-height: calc(100vh - var(--topbar-height));
  margin: 0 auto;
  padding: 48px 50px 100px;
}

.context-rail {
  position: sticky;
  top: var(--topbar-height);
  height: calc(100vh - var(--topbar-height));
  overflow: auto;
  padding: 28px 20px;
  border-left: 1px solid var(--border);
  background: rgba(246, 241, 232, 0.55);
}

.context-block + .context-block {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.context-title {
  margin: 0 0 10px;
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.context-rail ol,
.context-rail ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
  font-size: 12px;
  line-height: 1.55;
}

.context-rail a {
  color: var(--ink-soft);
  text-decoration: none;
}

.context-rail a:hover {
  color: var(--ink);
  text-decoration: underline;
}

.context-caption {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 11px;
}

.context-link-button {
  padding: 0;
  border: 0;
  color: var(--ink-soft);
  background: transparent;
  font-size: 12px;
  text-align: left;
}

.context-link-button:hover {
  color: var(--ink);
  text-decoration: underline;
}

.mini-progress {
  height: 7px;
  overflow: hidden;
  border: 1px solid var(--border-strong);
  border-radius: 5px;
  background: var(--paper-soft);
}

.mini-progress span {
  display: block;
  height: 100%;
  background: var(--terracotta);
}

.pre-render {
  max-width: 760px;
}

.pre-render h1,
.dashboard-hero h1,
.chapter-heading h1,
.point-heading h1,
.page-heading h1 {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: clamp(38px, 5vw, 64px);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

.pre-render h2 {
  margin-top: 36px;
  font-size: 18px;
}

.pre-render p,
.pre-render li {
  color: var(--ink-soft);
}

.loading-panel {
  display: grid;
  min-height: 45vh;
  place-items: center;
  color: var(--ink-soft);
}

.loading-dots {
  display: inline-flex;
  gap: 5px;
}

.loading-dots i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--terracotta);
  animation: pulse 1s infinite alternate;
}

.loading-dots i:nth-child(2) {
  animation-delay: 0.2s;
}

.loading-dots i:nth-child(3) {
  animation-delay: 0.4s;
}

.dashboard-hero {
  position: relative;
  padding: 8px 0 44px;
  border-bottom: 1px solid var(--border-strong);
}

.dashboard-hero::after {
  position: absolute;
  right: 1%;
  bottom: 25px;
  width: 160px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime);
  content: "";
  transform: rotate(-2deg);
}

.dashboard-hero h1 {
  max-width: 720px;
}

.dashboard-hero .lead,
.chapter-heading .lead,
.page-heading .lead {
  max-width: 720px;
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--olive);
  border-radius: 7px;
  color: var(--paper-soft);
  background: var(--olive);
  box-shadow: 3px 3px 0 var(--lime);
  font-weight: 700;
  text-decoration: none;
}

.button:hover {
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0 var(--lime);
}

.button.secondary {
  color: var(--ink);
  background: transparent;
  box-shadow: none;
}

.button.secondary:hover {
  background: var(--paper-soft);
  box-shadow: 3px 3px 0 var(--border-strong);
}

.button.ghost {
  min-height: 38px;
  padding: 6px 11px;
  border-color: var(--border-strong);
  color: var(--ink-soft);
  background: transparent;
  box-shadow: none;
  font-size: 13px;
}

.button.ghost:hover,
.button.ghost.active {
  border-color: var(--olive);
  color: var(--ink);
  background: var(--lime-soft);
  transform: none;
  box-shadow: none;
}

.button.danger {
  border-color: var(--danger);
  color: var(--danger);
  background: transparent;
  box-shadow: none;
}

.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 24px 0 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--paper-soft);
  box-shadow: var(--shadow);
}

.stat-cell {
  min-height: 100px;
  padding: 18px;
}

.stat-cell + .stat-cell {
  border-left: 1px solid var(--border);
}

.stat-cell strong {
  display: block;
  font: 500 30px/1.1 var(--font-display);
}

.stat-cell span {
  display: block;
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 12px;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin: 54px 0 20px;
}

.section-head h2 {
  margin: 0;
  font: 500 30px/1.2 var(--font-display);
  letter-spacing: -0.02em;
}

.section-head p {
  max-width: 460px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
  text-align: right;
}

.learning-loop {
  display: flex;
  overflow-x: auto;
  align-items: center;
  gap: 0;
  padding: 15px 0 20px;
  scrollbar-width: thin;
}

.loop-node {
  display: inline-flex;
  min-width: max-content;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 700;
}

.loop-node span {
  display: inline-grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border: 1px solid var(--olive);
  border-radius: 50%;
  background: var(--lime-soft);
}

.loop-node::after {
  width: 28px;
  height: 1px;
  margin: 0 7px;
  background: var(--border-strong);
  content: "";
}

.loop-node:last-child::after {
  width: 18px;
  height: 18px;
  border: 1px solid var(--border-strong);
  border-left: 0;
  border-radius: 0 50% 50% 0;
  background: transparent;
}

.stage-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border-strong);
}

.stage-card {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr) 180px;
  gap: 22px;
  padding: 25px 0;
  border-bottom: 1px solid var(--border);
}

.stage-card:hover .stage-number {
  color: var(--olive);
  background: var(--lime);
}

.stage-number {
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  border: 1px solid var(--olive);
  border-radius: 50%;
  color: var(--lime);
  background: var(--olive);
  font: 500 24px/1 var(--font-display);
  transition: color 160ms ease, background-color 160ms ease;
}

.stage-main h3 {
  margin: 0;
  font-size: 19px;
  line-height: 1.4;
}

.stage-main p {
  margin: 6px 0 13px;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.65;
}

.stage-main .stage-question {
  display: flex;
  gap: 9px;
  align-items: baseline;
  margin: 9px 0 0;
  color: var(--ink);
  font: 500 17px/1.5 var(--font-display);
}

.stage-question span {
  flex: none;
  color: var(--terracotta);
  font: 800 10px/1.2 var(--font-sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stage-contract {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 15px 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--border);
}

.stage-contract div {
  padding: 11px 12px;
  background: var(--paper-soft);
}

.stage-contract dt {
  margin-bottom: 5px;
  color: var(--terracotta);
  font-size: 10px;
  font-weight: 800;
}

.stage-contract dd {
  margin: 0;
  color: var(--ink-soft);
  font-size: 11px;
  line-height: 1.55;
}

.stage-chapters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.stage-chapters a {
  display: grid;
  min-height: 48px;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 2px 7px;
  padding: 7px 9px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--paper-soft);
  font-size: 11px;
  text-decoration: none;
}

.stage-chapters a > span {
  grid-row: 1 / 3;
  color: var(--terracotta);
  font-family: var(--font-display);
  font-size: 15px;
}

.stage-chapters a strong {
  font-size: 11px;
  line-height: 1.25;
}

.stage-chapters a small {
  max-width: 280px;
  color: var(--ink-soft);
  font-size: 10px;
  line-height: 1.35;
}

.stage-chapters a:hover {
  border-color: var(--olive);
}

.stage-status {
  align-self: start;
  margin-top: 8px;
}

.stage-status-row {
  display: flex;
  justify-content: space-between;
  color: var(--ink-soft);
  font-size: 11px;
}

.progress-track {
  height: 9px;
  margin-top: 7px;
  overflow: hidden;
  border: 1px solid var(--border-strong);
  border-radius: 5px;
  background: var(--paper-soft);
}

.progress-track span {
  display: block;
  height: 100%;
  background: var(--terracotta);
}

.evidence-note {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 30px;
  margin-top: 52px;
  padding: 28px;
  border: 1px solid var(--olive);
  border-radius: var(--radius);
  color: var(--paper-soft);
  background: var(--olive);
}

.evidence-note h2 {
  margin: 0 0 8px;
  color: var(--lime);
  font: 500 30px/1.2 var(--font-display);
}

.evidence-note p {
  margin: 0;
  color: rgba(251, 248, 242, 0.78);
  font-size: 13px;
}

.evidence-legend {
  display: grid;
  gap: 7px;
}

.legend-row {
  display: grid;
  grid-template-columns: 86px 1fr;
  gap: 12px;
  align-items: start;
  font-size: 11px;
}

.legend-row span:last-child {
  color: rgba(251, 248, 242, 0.72);
}

.badge {
  display: inline-flex;
  width: fit-content;
  min-height: 24px;
  align-items: center;
  padding: 2px 8px;
  border: 1px solid currentColor;
  border-radius: 99px;
  font-size: 10px;
  font-weight: 750;
  line-height: 1.2;
  white-space: nowrap;
}

.badge.green { color: var(--green); background: var(--green-soft); }
.badge.blue { color: var(--blue); background: var(--blue-soft); }
.badge.amber { color: var(--amber); background: var(--amber-soft); }
.badge.orange { color: #833d28; background: var(--terracotta-soft); }
.badge.violet { color: var(--violet); background: var(--violet-soft); }
.badge.neutral { color: var(--ink-soft); background: var(--paper-deep); }

.chapter-heading,
.page-heading {
  padding-bottom: 30px;
  border-bottom: 1px solid var(--border-strong);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  color: var(--ink-soft);
  font-size: 12px;
}

.breadcrumbs a {
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--ink);
  text-decoration: underline;
}

.chapter-heading h1,
.page-heading h1 {
  max-width: 760px;
  font-size: clamp(36px, 4vw, 54px);
}

.chapter-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 22px;
  color: var(--ink-soft);
  font-size: 12px;
}

.chapter-meta-row span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.chapter-question-label {
  margin: 22px 0 3px;
  color: var(--terracotta);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.chapter-heading .chapter-question-text {
  max-width: 820px;
  margin-top: 0;
  color: var(--ink);
  font: 500 clamp(20px, 2.6vw, 28px)/1.48 var(--font-display);
}

.course-contract {
  margin-top: 28px;
  overflow: hidden;
  border: 1px solid var(--olive);
  border-radius: var(--radius);
  background: var(--paper-soft);
  box-shadow: 4px 4px 0 var(--lime-soft);
}

.contract-role {
  display: grid;
  grid-template-columns: 145px 1fr;
  gap: 18px;
  margin: 0;
  padding: 17px 20px;
  color: var(--paper-soft);
  background: var(--olive);
  font-size: 14px;
  line-height: 1.6;
}

.contract-role span {
  color: var(--lime);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.contract-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
}

.contract-grid div {
  padding: 18px 20px;
}

.contract-grid div + div {
  border-left: 1px solid var(--border);
}

.contract-grid dt {
  margin-bottom: 8px;
  color: var(--terracotta);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.06em;
}

.contract-grid dd {
  margin: 0;
  font-size: 12px;
  line-height: 1.65;
}

.contract-footer {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 20px;
  padding: 15px 20px;
  border-top: 1px solid var(--border);
  color: var(--ink-soft);
  background: var(--paper-deep);
  font-size: 11px;
  line-height: 1.6;
}

.contract-footer p,
.contract-footer > div {
  margin: 0;
}

.dependency-list.inline {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-left: 4px;
}

.dependency-list.inline a,
.dependency-list.inline .dependency-empty {
  display: inline-flex;
  min-height: 28px;
  padding: 3px 7px;
  background: var(--paper-soft);
}

.glossary-panel {
  margin-top: 20px;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(251, 248, 242, 0.72);
}

.glossary-panel h2 {
  margin: 0 0 12px;
  color: var(--terracotta);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.glossary-panel dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
  margin: 0;
}

.glossary-panel dl > div {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 10px;
  padding-top: 9px;
  border-top: 1px solid var(--border);
}

.glossary-panel dt {
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
}

.glossary-panel dd {
  margin: 0;
  color: var(--ink-soft);
  font-size: 11px;
  line-height: 1.65;
}

.chapter-context {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 26px;
  margin-top: 28px;
}

.objective-panel,
.dependency-panel {
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--paper-soft);
}

.objective-panel h2,
.dependency-panel h2 {
  margin: 0 0 12px;
  color: var(--ink-soft);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.objective-panel ol {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 22px;
  font-size: 13px;
}

.dependency-list {
  display: grid;
  gap: 8px;
}

.dependency-list a,
.dependency-empty {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 36px;
  padding: 6px 9px;
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--ink-soft);
  font-size: 12px;
  text-decoration: none;
}

.dependency-list a:hover {
  border-color: var(--olive);
  color: var(--ink);
}

.chapter-tools {
  position: sticky;
  z-index: 10;
  top: calc(var(--topbar-height) - 1px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin: 36px -10px 16px;
  padding: 12px 10px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  backdrop-filter: blur(14px);
}

.library-mode-note {
  margin: 0 0 14px;
  padding: 11px 13px;
  border-left: 3px solid var(--olive);
  color: var(--ink-soft);
  background: var(--lime-soft);
  font-size: 12px;
  line-height: 1.6;
}

.library-mode-note.library-warning {
  border-left-color: var(--terracotta);
  background: var(--terracotta-soft);
}

.filter-select {
  min-height: 38px;
  padding: 6px 28px 6px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--paper-soft);
  font-size: 12px;
}

.filter-count {
  margin-left: auto;
  color: var(--ink-soft);
  font-size: 11px;
}

.point-list {
  border-top: 1px solid var(--border-strong);
}

.lesson-card {
  position: relative;
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) auto;
  gap: 20px;
  padding: 30px 5px;
  border-bottom: 1px solid var(--border-strong);
}

.lesson-card::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 34px;
  width: 1px;
  background: var(--border);
  content: "";
}

.lesson-card:first-child::before {
  top: 52px;
}

.lesson-card:last-child::before {
  bottom: calc(100% - 52px);
}

.lesson-step {
  z-index: 1;
  display: grid;
  width: 68px;
  height: 68px;
  place-content: center;
  border: 1px solid var(--olive);
  border-radius: 50%;
  color: var(--paper-soft);
  background: var(--olive);
  text-align: center;
}

.lesson-step span {
  color: var(--lime);
  font-size: 8px;
  font-weight: 850;
  letter-spacing: 0.08em;
}

.lesson-step strong {
  font: 500 24px/0.95 var(--font-display);
}

.lesson-step small {
  margin-top: 3px;
  color: rgba(251, 248, 242, 0.72);
  font-size: 8px;
}

.lesson-card-main h3 {
  margin: 2px 0 12px;
  font: 500 24px/1.35 var(--font-display);
}

.lesson-card-main h3 a {
  color: var(--ink);
  text-decoration: none;
}

.lesson-card-main h3 a:hover {
  text-decoration: underline;
  text-decoration-color: var(--terracotta);
}

.lesson-role {
  margin: 0;
  color: var(--terracotta);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.lesson-source-claim {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
  margin: 0 0 16px;
  padding: 11px 13px;
  border-left: 3px solid var(--border-strong);
  color: var(--ink-soft);
  background: var(--paper-soft);
}

.lesson-source-claim span {
  color: var(--ink-soft);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 0.05em;
}

.lesson-source-claim p {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
}

.lesson-reason-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.lesson-reason-grid > div {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: rgba(251, 248, 242, 0.55);
}

.lesson-reason-grid small {
  display: block;
  margin-bottom: 5px;
  color: var(--terracotta);
  font-size: 9px;
  font-weight: 850;
}

.lesson-reason-grid p {
  margin: 0;
  font-size: 12px;
  line-height: 1.65;
}

.lesson-action,
.lesson-output {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 8px;
  margin-top: 11px;
  font-size: 12px;
  line-height: 1.6;
}

.lesson-action {
  padding: 12px 14px;
  border: 1px solid var(--olive);
  border-radius: 6px;
  background: var(--lime-soft);
}

.lesson-output {
  color: var(--ink-soft);
}

.lesson-next {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 15px;
  color: var(--ink);
  font-size: 12px;
  font-weight: 750;
  text-decoration-color: var(--terracotta);
  text-underline-offset: 3px;
}

.point-card {
  position: relative;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  gap: 15px;
  padding: 22px 5px;
  border-bottom: 1px solid var(--border);
}

.point-card:hover {
  background: linear-gradient(90deg, transparent, rgba(251, 248, 242, 0.86) 5%, rgba(251, 248, 242, 0.86) 95%, transparent);
}

.point-index {
  display: grid;
  padding-top: 3px;
  color: var(--terracotta);
  font: 500 16px/1.2 var(--font-display);
}

.point-index small {
  color: var(--ink-soft);
  font: 800 8px/1.2 var(--font-sans);
  letter-spacing: 0.06em;
}

.point-card-main {
  min-width: 0;
}

.point-card-title {
  display: block;
  margin: 0;
  font-size: 15px;
  font-weight: 650;
  line-height: 1.65;
  text-decoration: none;
}

.point-card-title:hover {
  text-decoration: underline;
  text-decoration-color: var(--terracotta);
}

.point-card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  margin-top: 10px;
  color: var(--ink-soft);
  font-size: 10px;
}

.point-card-meta .source-name {
  max-width: 280px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.point-card-actions {
  display: flex;
  gap: 5px;
  padding-top: 1px;
}

.icon-button {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--ink-soft);
  background: transparent;
}

.icon-button:hover,
.icon-button.active {
  border-color: var(--olive);
  color: var(--ink);
  background: var(--lime-soft);
}

.load-more-wrap {
  display: grid;
  place-items: center;
  padding: 28px 0;
}

.empty-state {
  padding: 48px 20px;
  color: var(--ink-soft);
  text-align: center;
}

.point-page {
  max-width: 800px;
}

.point-heading {
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-strong);
}

.point-heading h1 {
  font-family: var(--font-sans);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 650;
  letter-spacing: -0.025em;
  line-height: 1.45;
}

.point-source-line {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 14px;
  margin: 18px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--border-strong);
  color: var(--ink-soft);
  background: var(--paper-soft);
  font-size: 12px;
  line-height: 1.65;
}

.point-source-line span {
  color: var(--terracotta);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.point-id {
  margin-left: auto;
  color: var(--ink-soft);
  font: 11px/1.2 ui-monospace, SFMono-Regular, Menlo, monospace;
}

.point-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin-top: 23px;
}

.point-section {
  padding: 30px 0;
  border-bottom: 1px solid var(--border);
}

.point-section h2 {
  margin: 0 0 12px;
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.point-section p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
}

.teaching-placement {
  margin-top: 28px;
  padding: 24px;
  border: 1px solid var(--olive);
  border-radius: var(--radius);
  background: var(--paper-soft);
  box-shadow: 5px 5px 0 var(--lime-soft);
}

.teaching-placement-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 17px;
  border-bottom: 1px solid var(--border);
}

.teaching-placement-head .eyebrow {
  margin: 0 0 5px;
}

.teaching-placement-head h2 {
  margin: 0;
  color: var(--ink);
  font: 500 22px/1.35 var(--font-display);
  letter-spacing: 0;
  text-transform: none;
}

.teaching-placement-head > a {
  flex: none;
  font-size: 11px;
}

.teaching-question {
  margin: 17px 0 !important;
  padding: 13px 15px;
  color: var(--paper-soft);
  background: var(--olive);
  font-size: 13px !important;
  line-height: 1.65 !important;
}

.teaching-question strong {
  color: var(--lime);
}

.teaching-explain-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--border);
}

.teaching-explain-grid > div {
  padding: 16px;
  background: var(--paper);
}

.teaching-explain-grid h3 {
  margin: 0 0 7px;
  color: var(--terracotta);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.06em;
}

.teaching-explain-grid p {
  color: var(--ink);
  font-size: 13px;
  line-height: 1.72;
}

.teaching-explain-grid .teaching-limit {
  color: #67481a;
  background: var(--amber-soft);
}

.lesson-template {
  margin-top: 14px;
  padding: 15px 16px;
  border: 1px solid var(--blue);
  border-radius: 7px;
  background: var(--blue-soft);
}

.lesson-template strong {
  display: block;
  margin-bottom: 7px;
  color: var(--blue);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.lesson-template p {
  color: var(--ink);
  font: 600 12px/1.8 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre-wrap;
}

.teaching-next-action {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 10px;
  margin-top: 14px;
  padding: 14px 16px;
  border-left: 4px solid var(--terracotta);
  background: var(--terracotta-soft);
  font-size: 13px;
  line-height: 1.65;
}

.library-placement {
  margin-top: 24px;
  padding: 18px 20px;
  border: 1px dashed var(--border-strong);
  background: var(--paper-soft);
}

.library-placement a {
  margin-left: 4px;
  font-weight: 750;
}

.condition-box {
  position: relative;
  padding: 19px 20px 19px 25px;
  border-left: 4px solid var(--terracotta);
  background: var(--terracotta-soft);
}

.condition-box::before {
  position: absolute;
  top: 20px;
  left: -9px;
  width: 14px;
  height: 14px;
  border: 2px solid var(--paper);
  border-radius: 50%;
  background: var(--terracotta);
  content: "";
}

.number-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.number-list li {
  padding: 8px 12px;
  border: 1px solid var(--olive);
  border-radius: 6px;
  background: var(--lime-soft);
  font: 700 13px/1.3 ui-monospace, SFMono-Regular, Menlo, monospace;
}

.evidence-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--paper-soft);
}

.evidence-card p {
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.7;
}

.time-warning {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-top: 12px;
  padding: 11px 13px;
  border: 1px solid var(--amber);
  border-radius: 6px;
  color: #67481a;
  background: var(--amber-soft);
  font-size: 12px;
}

.source-card {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--paper-soft);
}

.source-card strong {
  display: block;
  margin-bottom: 5px;
  font-size: 14px;
}

.source-card dl {
  display: grid;
  grid-template-columns: 66px 1fr;
  gap: 5px 12px;
  margin: 10px 0 0;
  color: var(--ink-soft);
  font-size: 11px;
}

.source-card dt {
  font-weight: 750;
}

.source-card dd {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.section-note {
  margin: -2px 0 14px !important;
  color: var(--ink-soft);
  font-size: 12px !important;
}

.relation-empty {
  padding: 18px;
  border: 1px dashed var(--border-strong);
  border-radius: 7px;
  color: var(--ink-soft);
  background: var(--paper-soft);
  font-size: 13px;
}

.context-grid .related-card {
  background: transparent;
}

.related-card {
  min-height: 112px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--paper-soft);
  text-decoration: none;
}

.related-card:hover {
  border-color: var(--olive);
  box-shadow: 3px 3px 0 var(--lime);
}

.related-card small {
  display: block;
  margin-bottom: 7px;
  color: var(--terracotta);
  font-weight: 750;
}

.related-card span {
  display: -webkit-box;
  overflow: hidden;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.55;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.notes-area {
  width: 100%;
  min-height: 130px;
  resize: vertical;
  padding: 14px;
  border: 1px solid var(--border-strong);
  border-radius: 7px;
  background: var(--paper-soft);
  line-height: 1.7;
}

.notes-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 7px;
  color: var(--ink-soft);
  font-size: 10px;
}

.point-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 30px;
}

.pager-link {
  display: block;
  min-height: 90px;
  padding: 13px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: transparent;
  text-decoration: none;
}

.pager-link:last-child {
  text-align: right;
}

.pager-link:hover {
  border-color: var(--olive);
  background: var(--paper-soft);
}

.pager-link small {
  display: block;
  margin-bottom: 5px;
  color: var(--ink-soft);
  font-size: 10px;
}

.pager-link span {
  display: -webkit-box;
  overflow: hidden;
  font-size: 12px;
  font-weight: 650;
  line-height: 1.5;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.review-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 25px 0;
}

.review-stage {
  position: relative;
  min-height: 430px;
  padding: 34px;
  border: 1px solid var(--olive);
  border-radius: var(--radius);
  background: var(--paper-soft);
  box-shadow: var(--shadow);
}

.review-counter {
  display: flex;
  justify-content: space-between;
  color: var(--ink-soft);
  font-size: 11px;
}

.review-question {
  max-width: 700px;
  margin: 48px 0 30px;
  font: 500 clamp(25px, 4vw, 38px)/1.45 var(--font-display);
}

.review-prompt {
  padding: 14px 16px;
  border-left: 3px solid var(--terracotta);
  color: var(--ink-soft);
  background: var(--terracotta-soft);
  font-size: 13px;
}

.review-answer {
  display: none;
  margin-top: 26px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.review-answer.revealed {
  display: block;
}

.review-answer p {
  margin: 7px 0;
  color: var(--ink-soft);
  font-size: 13px;
}

.review-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.review-schedule {
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-size: 10px;
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 30px;
}

.library-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--paper-soft);
}

.library-card h2 {
  margin: 0 0 10px;
  font: 500 21px/1.3 var(--font-display);
}

.library-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 12px;
}

.distribution-list {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.distribution-row {
  display: grid;
  grid-template-columns: 90px 1fr 38px;
  align-items: center;
  gap: 9px;
  color: var(--ink-soft);
  font-size: 11px;
}

.distribution-bar {
  height: 7px;
  overflow: hidden;
  border-radius: 4px;
  background: var(--paper-deep);
}

.distribution-bar span {
  display: block;
  height: 100%;
  background: var(--terracotta);
}

.principles-list {
  display: grid;
  gap: 0;
  margin-top: 40px;
  border-top: 1px solid var(--border-strong);
}

.principle-row {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}

.principle-row span:first-child {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 50%;
  color: var(--olive);
  background: var(--lime);
  font: 600 13px/1 var(--font-display);
}

.principle-row strong {
  display: block;
  font-size: 14px;
}

.principle-row p {
  margin: 4px 0 0;
  color: var(--ink-soft);
  font-size: 12px;
}

.search-dialog {
  width: min(760px, calc(100vw - 32px));
  max-height: min(760px, calc(100vh - 40px));
  margin: 20px auto;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--olive);
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--paper-soft);
  box-shadow: 8px 9px 0 rgba(29, 33, 24, 0.3);
}

.search-dialog::backdrop {
  background: rgba(29, 33, 24, 0.55);
  backdrop-filter: blur(5px);
}

.search-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}

.search-head label {
  font-size: 13px;
  font-weight: 750;
}

.search-head button {
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: 5px;
  color: var(--ink-soft);
  background: transparent;
  font-size: 22px;
}

.search-head button:hover {
  color: var(--ink);
  background: var(--paper-deep);
}

.search-input-wrap {
  display: grid;
  grid-template-columns: 26px 1fr auto;
  align-items: center;
  gap: 8px;
  margin: 16px;
  padding: 0 12px;
  border: 2px solid var(--olive);
  border-radius: 8px;
  background: #fffefb;
}

.search-input-wrap:focus-within {
  outline: 3px solid var(--terracotta);
  outline-offset: 3px;
}

.search-input-wrap input {
  height: 50px;
  border: 0;
  outline: 0;
  background: transparent;
}

.search-input-wrap input:focus-visible {
  outline: 0;
}

.search-help {
  padding: 0 18px 13px;
  color: var(--ink-soft);
  font-size: 11px;
}

.search-results {
  max-height: 560px;
  overflow: auto;
  border-top: 1px solid var(--border);
}

.search-result {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 10px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
}

.search-result:hover,
.search-result:focus {
  background: var(--lime-soft);
}

.search-result-number {
  color: var(--terracotta);
  font: 500 14px/1.5 var(--font-display);
}

.search-result strong {
  display: block;
  font-size: 13px;
  line-height: 1.55;
}

.search-result p {
  margin: 4px 0 0;
  color: var(--ink-soft);
  font-size: 10px;
}

mark {
  color: inherit;
  background: var(--lime);
}

.toast {
  position: fixed;
  z-index: 100;
  right: 22px;
  bottom: 22px;
  max-width: 340px;
  padding: 11px 15px;
  opacity: 0;
  border: 1px solid var(--olive);
  border-radius: 7px;
  color: var(--paper-soft);
  background: var(--olive);
  box-shadow: var(--shadow-soft);
  font-size: 12px;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.rail-scrim {
  display: none;
}

@keyframes shimmer {
  to { background-position: -200% 0; }
}

@keyframes pulse {
  to { opacity: 0.25; transform: translateY(-3px); }
}

@media (max-width: 1320px) {
  .app-shell {
    grid-template-columns: var(--rail-width) minmax(0, 1fr);
  }

  .context-rail {
    display: none;
  }
}

@media (max-width: 960px) {
  :root {
    --topbar-height: 64px;
  }

  .topbar {
    padding: 0 16px;
  }

  .brand-copy small,
  .top-link,
  .search-trigger span:nth-child(2),
  .search-trigger kbd {
    display: none;
  }

  .search-trigger {
    min-width: 44px;
    width: 44px;
    height: 44px;
    justify-content: center;
    padding: 0;
  }

  .menu-button {
    display: grid;
    width: 44px;
    height: 44px;
  }

  .app-shell {
    display: block;
  }

  .course-rail {
    position: fixed;
    z-index: 70;
    top: var(--topbar-height);
    left: 0;
    width: min(340px, 88vw);
    transform: translateX(-105%);
    transition: transform 180ms ease;
  }

  .menu-open .course-rail {
    transform: translateX(0);
  }

  .rail-scrim {
    position: fixed;
    z-index: 60;
    inset: var(--topbar-height) 0 0;
    display: block;
    opacity: 0;
    background: rgba(29, 33, 24, 0.45);
    pointer-events: none;
    transition: opacity 180ms ease;
  }

  .menu-open .rail-scrim {
    opacity: 1;
    pointer-events: auto;
  }

  .main-content {
    padding: 36px 28px 80px;
  }

  .chapter-tools {
    top: calc(var(--topbar-height) - 1px);
  }
}

@media (max-width: 680px) {
  .topbar {
    gap: 8px;
    padding: 0 12px;
  }

  .brand {
    gap: 9px;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .brand-copy strong {
    font-size: 14px;
  }

  .topbar-actions {
    gap: 5px;
  }

  .progress-pill {
    min-width: 48px;
    padding: 0 8px;
    font-size: 11px;
  }

  .main-content {
    padding: 30px 18px 70px;
  }

  .dashboard-hero {
    padding-top: 0;
  }

  .dashboard-hero::after {
    display: none;
  }

  .dashboard-hero .lead,
  .chapter-heading .lead,
  .page-heading .lead {
    font-size: 16px;
  }

  .stats-strip {
    grid-template-columns: 1fr 1fr;
  }

  .stat-cell {
    min-height: 88px;
    padding: 14px;
  }

  .stat-cell + .stat-cell {
    border-left: 0;
  }

  .stat-cell:nth-child(even) {
    border-left: 1px solid var(--border);
  }

  .stat-cell:nth-child(n + 3) {
    border-top: 1px solid var(--border);
  }

  .section-head {
    display: block;
    margin-top: 42px;
  }

  .section-head p {
    margin-top: 8px;
    text-align: left;
  }

  .stage-card {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 12px;
    padding: 22px 0;
  }

  .stage-number {
    width: 42px;
    height: 42px;
    font-size: 18px;
  }

  .stage-status {
    grid-column: 2;
  }

  .stage-main .stage-question {
    display: block;
  }

  .stage-question span {
    display: block;
    margin-bottom: 4px;
  }

  .stage-contract,
  .contract-grid,
  .contract-footer {
    grid-template-columns: 1fr;
  }

  .stage-contract div + div,
  .contract-grid div + div {
    border-top: 1px solid var(--border);
    border-left: 0;
  }

  .stage-chapters a {
    width: 100%;
  }

  .contract-role {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .evidence-note,
  .chapter-context,
  .library-grid {
    grid-template-columns: 1fr;
  }

  .chapter-tools {
    position: static;
    margin-top: 24px;
    background: transparent;
    backdrop-filter: none;
  }

  .filter-count {
    width: 100%;
    margin: 2px 0 0;
  }

  .point-card {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 9px;
  }

  .point-card-actions {
    grid-column: 2;
    justify-content: flex-start;
  }

  .lesson-card {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 12px;
    padding: 24px 0;
  }

  .lesson-card::before {
    left: 25px;
  }

  .lesson-step {
    width: 52px;
    height: 52px;
  }

  .lesson-step strong {
    font-size: 19px;
  }

  .lesson-card-main h3 {
    font-size: 21px;
  }

  .lesson-source-claim,
  .lesson-reason-grid,
  .lesson-action,
  .lesson-output,
  .point-source-line,
  .teaching-explain-grid,
  .teaching-next-action {
    grid-template-columns: 1fr;
  }

  .glossary-panel dl,
  .glossary-panel dl > div {
    grid-template-columns: 1fr;
  }

  .lesson-card > .point-card-actions {
    grid-column: 2;
  }

  .teaching-placement {
    padding: 18px;
  }

  .teaching-placement-head {
    display: block;
  }

  .teaching-placement-head > a {
    display: inline-block;
    margin-top: 10px;
  }

  .icon-button {
    width: 44px;
    height: 44px;
  }

  .filter-select,
  .button.ghost {
    min-height: 44px;
  }

  .related-grid,
  .point-pager {
    grid-template-columns: 1fr;
  }

  .pager-link:last-child {
    text-align: left;
  }

  .review-stage {
    min-height: 460px;
    padding: 24px 20px;
  }

  .review-question {
    margin-top: 34px;
  }

  .search-dialog {
    width: calc(100vw - 18px);
    max-height: calc(100vh - 18px);
    margin: 9px auto;
  }

  .toast {
    right: 12px;
    bottom: 12px;
    left: 12px;
    max-width: none;
  }
}

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