:root {
  color-scheme: light;
  --bg: #f6faf8;
  --surface: #ffffff;
  --surface-soft: #edf4f2;
  --surface-warm: #fff8ee;
  --ink: #1d2528;
  --muted: #5d6764;
  --subtle: #7c8b86;
  --line: #d5e0dd;
  --line-strong: #b4c5c0;
  --accent: #0f766e;
  --accent-strong: #0b5f59;
  --accent-soft: #d8ede8;
  --coral: #b84d37;
  --coral-soft: #f8e2dc;
  --gold: #a06d12;
  --gold-soft: #f4e9c9;
  --code-bg: #172026;
  --code-ink: #eef6f7;
  --shadow: 0 18px 46px rgb(29 37 40 / 10%);
  --sidebar: clamp(17rem, 24vw, 21rem);
  --content: 66rem;
  --reader-content: 55rem;
  --radius: 8px;
  --radius-sm: 6px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    linear-gradient(180deg, rgb(15 118 110 / 8%), transparent 28rem),
    linear-gradient(90deg, rgb(255 248 238 / 82%), transparent 36rem),
    var(--bg);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

[hidden] {
  display: none !important;
}

a {
  color: inherit;
}

button,
input,
textarea {
  font: inherit;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  transform: none !important;
}

.site-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: 4px;
  background: transparent;
}

.site-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--coral), var(--gold));
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.4rem;
  padding: 0.75rem clamp(1rem, 4vw, 2.75rem);
  border-bottom: 1px solid rgb(213 224 221 / 82%);
  background: rgb(246 250 248 / 92%);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  flex: 0 0 2.4rem;
  width: 2.4rem;
  height: 2.4rem;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 850;
  box-shadow: 0 8px 24px rgb(29 37 40 / 8%);
}

.brand-copy {
  min-width: 0;
}

.brand-name,
.brand-line {
  display: block;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-name {
  font-size: 0.98rem;
  font-weight: 850;
}

.brand-line {
  margin-top: 0.12rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.segmented {
  display: inline-flex;
  align-items: center;
  gap: 0.12rem;
  padding: 0.18rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.segmented-button,
.icon-button,
.text-button,
.sidebar-action,
.scope-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  color: var(--ink);
  cursor: pointer;
}

.segmented-button {
  gap: 0.38rem;
  min-width: 3rem;
  min-height: 2.08rem;
  padding: 0 0.65rem;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
  white-space: nowrap;
}

.segmented-button.is-active {
  background: var(--accent);
  color: #fff;
}

.icon-button,
.text-button,
.sidebar-action {
  min-width: 2.35rem;
  min-height: 2.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  text-decoration: none;
}

.icon-button.small {
  min-width: 2rem;
  min-height: 2rem;
  width: 2rem;
  height: 2rem;
}

.text-button {
  gap: 0.42rem;
  padding: 0 0.78rem;
  font-size: 0.84rem;
  font-weight: 850;
  white-space: nowrap;
}

.text-button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.icon-button:hover,
.text-button:hover,
.sidebar-action:hover,
.segmented-button:hover,
.scope-chip:hover {
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.icon-button svg,
.text-button svg,
.sidebar-action svg,
.segmented-button svg,
.search-wrap svg {
  width: 1rem;
  height: 1rem;
  stroke-width: 2.1;
}

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar) minmax(0, 1fr);
  min-height: calc(100vh - 4.4rem);
}

.sidebar {
  border-right: 1px solid var(--line);
  background: rgb(255 255 255 / 72%);
}

.sidebar-sticky {
  position: sticky;
  top: 4.4rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-height: calc(100vh - 4.4rem);
  padding: 1rem;
}

.side-heading {
  display: grid;
  gap: 0.35rem;
  padding: 0.15rem 0.1rem 0;
}

.eyebrow {
  margin: 0;
  color: var(--coral);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.side-heading h2 {
  margin: 0;
  font-size: 1.04rem;
  line-height: 1.2;
}

.side-heading p:not(.eyebrow) {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.side-stat {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.52rem 0.7rem;
  align-items: center;
  padding: 0.78rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.side-stat span:first-child {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.side-stat strong {
  color: var(--accent-strong);
  font-size: 1rem;
}

.mini-progress,
.tile-progress,
.day-button-progress {
  display: block;
  overflow: hidden;
  height: 0.45rem;
  border-radius: 999px;
  background: rgb(15 118 110 / 12%);
}

.mini-progress {
  grid-column: 1 / -1;
}

.mini-progress span,
.tile-progress span,
.day-button-progress span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--coral), var(--gold));
}

.day-rail {
  overflow: auto;
  padding-right: 0.1rem;
}

.day-rail ol {
  display: grid;
  gap: 0.42rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.day-button {
  display: grid;
  grid-template-columns: 2.35rem minmax(0, 1fr);
  gap: 0.65rem;
  width: 100%;
  padding: 0.58rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.day-button:hover,
.day-button.is-active {
  border-color: var(--line);
  background: var(--surface);
}

.day-button.is-active {
  box-shadow: 0 10px 24px rgb(29 37 40 / 8%);
}

.day-button-index {
  display: grid;
  width: 2.35rem;
  height: 2.35rem;
  place-items: center;
  border-radius: var(--radius);
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 900;
}

.day-button-body {
  display: grid;
  gap: 0.24rem;
  min-width: 0;
}

.day-button-label {
  overflow: hidden;
  font-size: 0.9rem;
  font-weight: 850;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.day-button-meta {
  overflow: hidden;
  color: var(--muted);
  font-size: 0.76rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-action {
  justify-content: flex-start;
  gap: 0.5rem;
  width: 100%;
  padding: 0 0.75rem;
  color: var(--muted);
  font-size: 0.83rem;
  font-weight: 800;
}

.search-wrap {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  height: 2.6rem;
  padding: 0 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--subtle);
}

.search-wrap input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
}

.search-wrap input::placeholder {
  color: var(--subtle);
}

.toc {
  overflow: auto;
  padding-right: 0.15rem;
}

.toc ol {
  display: grid;
  gap: 0.22rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc a {
  display: block;
  padding: 0.48rem 0.6rem;
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.28;
  text-decoration: none;
}

.toc a:hover,
.toc a.is-active {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.toc a.depth-3 {
  padding-left: 1.25rem;
  font-size: 0.82rem;
}

.toc .is-hidden {
  display: none;
}

.workspace {
  min-width: 0;
}

.planner-view,
.reader-view {
  width: min(100%, calc(var(--content) + clamp(2rem, 7vw, 7rem)));
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 2.4rem) clamp(1rem, 4vw, 3.5rem) 5rem;
}

.reader-view {
  width: min(100%, calc(var(--reader-content) + clamp(2rem, 7vw, 7rem)));
}

.learning-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(16rem, 0.85fr);
  gap: clamp(1.2rem, 4vw, 3rem);
  align-items: center;
  padding: clamp(1rem, 3vw, 2rem) 0 clamp(1.25rem, 3vw, 2.25rem);
  border-bottom: 1px solid var(--line);
}

.learning-hero-copy {
  display: grid;
  gap: 0.9rem;
}

.learning-hero h1,
.reader-hero h1 {
  max-width: 45rem;
  margin: 0;
  font-size: clamp(2.1rem, 5vw, 4rem);
  line-height: 1.03;
  letter-spacing: 0;
}

.learning-hero p:not(.eyebrow),
.reader-summary {
  max-width: 45rem;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.7vw, 1.18rem);
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.1rem;
}

.hero-visual {
  position: relative;
  margin: 0;
  min-width: 0;
}

.hero-visual img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-visual figcaption {
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: 0.75rem;
  display: inline-flex;
  width: fit-content;
  max-width: calc(100% - 1.5rem);
  min-height: 2rem;
  align-items: center;
  padding: 0.4rem 0.62rem;
  border: 1px solid rgb(255 255 255 / 74%);
  border-radius: var(--radius);
  background: rgb(255 255 255 / 86%);
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 850;
  overflow-wrap: anywhere;
  backdrop-filter: blur(12px);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 1rem 0 1.6rem;
}

.stat-tile {
  display: grid;
  gap: 0.5rem;
  min-height: 7rem;
  align-content: center;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.stat-tile span:first-child {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 850;
}

.stat-tile strong {
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  line-height: 1;
}

.scope-section,
.note-section,
.checklist-section {
  padding: 1.35rem 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: grid;
  gap: 0.38rem;
  margin-bottom: 0.9rem;
}

.section-heading.split {
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: end;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  line-height: 1.12;
}

.scope-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.72rem;
}

.scope-chip {
  display: grid;
  justify-content: stretch;
  gap: 0.34rem;
  min-height: 7.6rem;
  padding: 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  text-align: left;
}

.scope-chip:nth-child(3n + 1) {
  background: linear-gradient(180deg, #fff, var(--accent-soft));
}

.scope-chip:nth-child(3n + 2) {
  background: linear-gradient(180deg, #fff, var(--coral-soft));
}

.scope-chip:nth-child(3n) {
  background: linear-gradient(180deg, #fff, var(--gold-soft));
}

.scope-chip-label {
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 900;
}

.scope-chip strong {
  font-size: 0.98rem;
  line-height: 1.25;
}

.scope-chip-focus {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.note-section textarea {
  display: block;
  width: 100%;
  min-height: 9rem;
  resize: vertical;
  padding: 0.95rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  outline: 0;
  background: var(--surface);
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.65;
}

.note-section textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgb(15 118 110 / 12%);
}

.checklist-groups {
  display: grid;
  gap: 0.82rem;
}

.task-group {
  display: grid;
  gap: 0.7rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 10px 28px rgb(29 37 40 / 6%);
}

.task-group.is-complete {
  border-color: rgb(15 118 110 / 45%);
  background: linear-gradient(180deg, var(--surface), rgb(216 237 232 / 58%));
}

.task-group-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.75rem;
  align-items: start;
}

.task-group-kicker {
  display: block;
  margin-bottom: 0.22rem;
  color: var(--coral);
  font-size: 0.74rem;
  font-weight: 900;
  text-transform: uppercase;
}

.task-group h3 {
  margin: 0;
  font-size: 1.04rem;
  line-height: 1.25;
}

.task-group-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 850;
  white-space: nowrap;
}

.task-group-focus {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.task-list {
  display: grid;
  gap: 0.52rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.task-check {
  position: relative;
  display: grid;
  grid-template-columns: 1.35rem minmax(0, 1fr);
  gap: 0.65rem;
  align-items: start;
  padding: 0.42rem 0;
  color: var(--ink);
  cursor: pointer;
}

.task-check input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.task-box {
  display: grid;
  width: 1.15rem;
  height: 1.15rem;
  margin-top: 0.2rem;
  place-items: center;
  border: 1.5px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.task-box::after {
  content: "";
  width: 0.38rem;
  height: 0.62rem;
  margin-top: -0.08rem;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  opacity: 0;
  transform: rotate(45deg);
}

.task-check input:checked + .task-box {
  border-color: var(--accent);
  background: var(--accent);
}

.task-check input:checked + .task-box::after {
  opacity: 1;
}

.task-check input:focus-visible + .task-box {
  box-shadow: 0 0 0 4px rgb(15 118 110 / 14%);
}

.task-check input:checked ~ .task-text {
  color: var(--muted);
  text-decoration: line-through;
  text-decoration-color: rgb(15 118 110 / 45%);
  text-decoration-thickness: 0.08em;
}

.task-text {
  min-width: 0;
  font-size: 0.96rem;
  line-height: 1.55;
}

.reader-hero {
  padding: clamp(1rem, 3vw, 2rem) 0 clamp(1.1rem, 3vw, 2rem);
  border-bottom: 1px solid var(--line);
}

.reader-hero .eyebrow {
  margin: 0 0 0.75rem;
}

.reader-summary {
  margin: 0.9rem 0 0;
}

.reader-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}

.reader-metrics span {
  display: inline-flex;
  align-items: baseline;
  gap: 0.38rem;
  min-height: 2.2rem;
  padding: 0.42rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.85rem;
}

.reader-metrics strong {
  color: var(--ink);
  font-size: 1rem;
}

.reader-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.prose {
  max-width: var(--reader-content);
  padding-top: 1.5rem;
}

.prose :target {
  scroll-margin-top: 5.4rem;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  color: var(--ink);
  letter-spacing: 0;
}

.prose h1 {
  margin: 0 0 1.2rem;
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.04;
}

.prose h2 {
  margin: 3.25rem 0 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: clamp(1.55rem, 3vw, 2.3rem);
  line-height: 1.14;
}

.prose h3 {
  margin: 2rem 0 0.7rem;
  font-size: clamp(1.12rem, 2vw, 1.38rem);
  line-height: 1.25;
}

.prose h4 {
  margin: 1.35rem 0 0.55rem;
  font-size: 1rem;
}

.prose p,
.prose li,
.prose blockquote,
.prose td,
.prose th {
  font-size: 1rem;
  line-height: 1.76;
}

.prose p {
  margin: 0.8rem 0;
}

.prose a {
  color: var(--accent-strong);
  font-weight: 650;
  text-decoration-color: rgb(15 118 110 / 32%);
  text-decoration-thickness: 0.09em;
  text-underline-offset: 0.18em;
}

.prose strong {
  color: #101719;
  font-weight: 850;
}

.prose ul,
.prose ol {
  padding-left: 1.3rem;
}

.prose li + li {
  margin-top: 0.28rem;
}

.prose blockquote {
  margin: 1.25rem 0;
  padding: 0.1rem 0 0.1rem 1rem;
  border-left: 0.22rem solid var(--accent);
  color: var(--muted);
}

.prose hr {
  height: 1px;
  margin: 2.5rem 0;
  border: 0;
  background: var(--line);
}

.prose table {
  display: block;
  width: 100%;
  margin: 1.25rem 0;
  overflow-x: auto;
  border-collapse: collapse;
  border-spacing: 0;
}

.prose th,
.prose td {
  min-width: 9rem;
  padding: 0.72rem 0.85rem;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.prose th {
  background: var(--surface-soft);
  color: var(--ink);
  font-size: 0.9rem;
}

.prose code {
  border-radius: var(--radius-sm);
  background: rgb(15 118 110 / 10%);
  color: var(--accent-strong);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
  padding: 0.12rem 0.28rem;
}

.prose pre {
  position: relative;
  overflow: auto;
  margin: 1.35rem 0;
  padding: 1.05rem;
  border: 1px solid rgb(255 255 255 / 10%);
  border-radius: var(--radius);
  background: var(--code-bg);
  box-shadow: var(--shadow);
}

.prose pre code {
  display: block;
  min-width: max-content;
  padding: 0;
  background: transparent;
  color: var(--code-ink);
  font-size: 0.88rem;
  line-height: 1.65;
}

.mermaid {
  margin: 1.35rem 0;
  padding: 1rem;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.loading {
  min-height: 20rem;
  color: var(--muted);
}

.noscript {
  max-width: 48rem;
  margin: 4rem auto;
  padding: 0 1rem;
}

.noscript a {
  margin-right: 1rem;
  color: var(--accent-strong);
  font-weight: 850;
}

@media (max-width: 1040px) {
  .topbar {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .topbar-actions {
    flex-wrap: wrap;
    justify-content: flex-end;
  }

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

  .hero-visual {
    max-width: 34rem;
  }
}

@media (max-width: 920px) {
  .app-shell {
    display: block;
  }

  .sidebar {
    position: sticky;
    top: 4.4rem;
    z-index: 20;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    background: rgb(246 250 248 / 95%);
    backdrop-filter: blur(16px);
  }

  .sidebar-sticky {
    position: static;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    max-height: none;
    padding: 0.75rem 1rem;
  }

  .planner-sidebar {
    gap: 0.75rem;
  }

  .side-heading,
  .side-stat,
  .sidebar-action {
    display: none;
  }

  .day-rail {
    max-width: calc(100vw - 2rem);
    overflow-x: auto;
  }

  .day-rail ol {
    display: flex;
    gap: 0.45rem;
    width: max-content;
    max-width: none;
  }

  .day-button {
    width: 12rem;
  }

  .reader-sidebar {
    gap: 0.65rem;
  }

  .toc {
    max-width: calc(100vw - 2rem);
    overflow-x: auto;
  }

  .toc ol {
    display: flex;
    gap: 0.35rem;
    width: max-content;
    max-width: none;
  }

  .toc a {
    width: max-content;
    max-width: 16rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .toc a.depth-3 {
    padding-left: 0.6rem;
  }

  .planner-view,
  .reader-view {
    padding-top: 1rem;
  }
}

@media (max-width: 760px) {
  .stats-grid,
  .scope-list {
    grid-template-columns: 1fr;
  }

  .stat-tile {
    min-height: 5.8rem;
  }
}

@media (max-width: 640px) {
  .topbar {
    min-height: 6rem;
    padding: 0.7rem 0.85rem;
  }

  .brand {
    max-width: min(19rem, 100%);
  }

  .brand-line {
    white-space: normal;
  }

  .topbar-actions {
    justify-content: flex-start;
    gap: 0.35rem;
    width: 100%;
  }

  .segmented-button {
    min-width: 2.5rem;
    padding: 0 0.48rem;
  }

  .view-toggle .segmented-button {
    min-width: 2.35rem;
  }

  .view-toggle .segmented-button span {
    display: none;
  }

  .icon-button {
    width: 2.2rem;
    min-width: 2.2rem;
    min-height: 2.2rem;
    height: 2.2rem;
  }

  .sidebar {
    top: 6rem;
  }

  .learning-hero h1,
  .reader-hero h1 {
    font-size: 2.12rem;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .hero-actions .text-button:last-child {
    grid-column: 1 / -1;
  }

  .text-button {
    min-width: 0;
    padding: 0 0.6rem;
  }

  .hero-visual figcaption {
    position: static;
    width: 100%;
    margin-top: 0.5rem;
    max-width: none;
  }

  .section-heading.split,
  .task-group-header {
    grid-template-columns: 1fr;
  }

  .section-heading.split .text-button {
    width: fit-content;
  }

  .reader-toolbar {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding: 0.75rem 0;
  }

  .reader-summary,
  .prose p,
  .prose li,
  .prose blockquote,
  .prose td,
  .prose th {
    font-size: 0.96rem;
  }

  .prose h2 {
    margin-top: 2.4rem;
  }
}

@media (max-width: 420px) {
  .hero-actions {
    grid-template-columns: 1fr;
  }

  .hero-actions .text-button:last-child {
    grid-column: auto;
  }

  .day-button {
    width: 11rem;
  }

  .scope-chip {
    min-height: 8.5rem;
  }
}