:root {
  --course-blue: #2563eb;
  --course-green: #059669;
  --course-orange: #ea580c;
  --course-purple: #7c3aed;
  --course-red: #dc2626;
  --course-ink: #172033;
  --course-muted: #64748b;
  --course-paper: #f8fafc;
}

.slidev-layout {
  padding: 2rem 2.35rem !important;
  color: var(--course-ink);
}

.slidev-layout h1 {
  font-size: 2.05rem !important;
  line-height: 1.15;
  margin-bottom: 1rem !important;
}

.slidev-layout h2 {
  font-size: 1.55rem !important;
  line-height: 1.2;
}

.slidev-layout h3 {
  font-size: 1.15rem !important;
  line-height: 1.25;
  margin: 0 0 0.45rem !important;
}

.slidev-layout p,
.slidev-layout li {
  font-size: 1rem;
  line-height: 1.4;
}

.course-subtitle {
  max-width: 760px;
  color: var(--course-muted);
  font-size: 1.22rem !important;
  line-height: 1.35 !important;
}

.course-cover-meta {
  position: absolute;
  left: 2.35rem;
  bottom: 2rem;
  max-width: 850px;
  color: var(--course-muted);
  font-size: 0.8rem;
}

.slidev-layout ul,
.slidev-layout ol {
  margin: 0.35rem 0 !important;
}

.slidev-layout li + li {
  margin-top: 0.35rem;
}

.slidev-layout pre,
.slidev-layout code {
  font-size: 0.87rem !important;
}

.slidev-layout pre {
  max-height: 410px;
  overflow: hidden;
}

.slidev-layout table {
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.slidev-layout th,
.slidev-layout td {
  padding: 0.45rem 0.7rem !important;
}

.course-card {
  border: 2px solid #cbd5e1;
  border-radius: 0.8rem;
  padding: 1rem;
  background: rgba(248, 250, 252, 0.92);
}

.course-card p {
  margin: 0 !important;
}

.course-card ul {
  padding-left: 1.15rem;
}

.course-card.blue {
  border-color: #93c5fd;
  background: rgba(239, 246, 255, 0.94);
}

.course-card.green {
  border-color: #6ee7b7;
  background: rgba(236, 253, 245, 0.94);
}

.course-card.orange {
  border-color: #fdba74;
  background: rgba(255, 247, 237, 0.94);
}

.course-card.purple {
  border-color: #c4b5fd;
  background: rgba(245, 243, 255, 0.94);
}

.course-card.red {
  border-color: #fca5a5;
  background: rgba(254, 242, 242, 0.94);
}

.course-kicker {
  color: var(--course-blue);
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.course-kicker-red {
  color: var(--course-red);
}

.course-big {
  font-size: 2.45rem;
  font-weight: 750;
  line-height: 1.15;
}

.course-reflection {
  max-width: 850px;
  margin: 0 auto;
  font-size: 2.1rem;
}

.course-rule {
  border-left: 6px solid var(--course-green);
  padding: 0.85rem 1.1rem;
  background: rgba(236, 253, 245, 0.95);
  border-radius: 0.3rem 0.8rem 0.8rem 0.3rem;
  font-size: 1.25rem;
  line-height: 1.35;
}

.course-boundary {
  border-left: 6px solid var(--course-red);
  padding: 1rem 1.2rem;
  background: rgba(254, 242, 242, 0.96);
  border-radius: 0.3rem 0.8rem 0.8rem 0.3rem;
  font-size: 1.3rem;
  line-height: 1.4;
}

.course-demo-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.55rem;
  color: var(--course-blue);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.course-terminal {
  background: #0f172a;
  color: #e2e8f0;
}

.course-terminal h1,
.course-terminal h2,
.course-terminal h3 {
  color: white;
}

.course-terminal .course-kicker {
  color: #67e8f9;
}

.course-terminal pre {
  border: 1px solid #334155;
  background: #020617 !important;
  white-space: pre-wrap !important;
  overflow-wrap: anywhere;
}

.course-terminal pre code,
.course-terminal pre code span {
  white-space: pre-wrap !important;
  overflow-wrap: anywhere;
}

.course-terminal-watch {
  max-width: 820px;
  margin-top: 1rem;
  color: #94a3b8;
  font-size: 0.86rem;
}

.course-figure {
  display: block;
  max-height: 430px;
  max-width: 100%;
  width: auto;
  margin: 0 auto;
}

.course-caption {
  color: var(--course-muted);
  font-size: 0.75rem;
  text-align: center;
  margin-top: 0.35rem;
}

.course-caption-strong {
  color: #475569;
  font-size: 0.82rem;
  font-weight: 650;
}

.course-link {
  display: flex;
  min-height: 92px;
  flex-direction: column;
  justify-content: center;
  gap: 0.35rem;
  border: 2px solid #cbd5e1;
  border-radius: 0.8rem;
  padding: 0.9rem 1rem;
  background: rgba(248, 250, 252, 0.94);
  color: var(--course-ink) !important;
  border-style: solid !important;
  text-decoration: none !important;
}

.course-link:hover {
  border-color: #60a5fa;
  background: #eff6ff;
}

.course-link-title {
  font-size: 1rem;
  font-weight: 700;
}

.course-link-path {
  overflow-wrap: anywhere;
  color: var(--course-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.68rem;
}

.course-next {
  max-width: 850px;
  margin: 1.2rem auto 0;
  font-size: 2rem;
  font-weight: 720;
  line-height: 1.2;
}

.course-next-arrow {
  margin-top: 1rem;
  color: var(--course-blue);
  font-size: 2.2rem;
}

.course-loop {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: stretch;
  gap: 0.65rem;
}

.course-loop-step {
  display: flex;
  min-height: 132px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 0.7rem;
  border: 2px solid #cbd5e1;
  border-radius: 0.8rem;
  padding: 1rem;
  text-align: left;
}

.course-loop-step span {
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.course-loop-step strong {
  font-size: 1.15rem;
  line-height: 1.25;
}

.course-loop-step.blue {
  border-color: #93c5fd;
  background: #eff6ff;
}

.course-loop-step.green {
  border-color: #6ee7b7;
  background: #ecfdf5;
}

.course-loop-step.purple {
  border-color: #c4b5fd;
  background: #f5f3ff;
}

.course-loop-step.orange {
  border-color: #fdba74;
  background: #fff7ed;
}

.course-loop-arrow {
  align-self: center;
  color: var(--course-blue);
  font-size: 1.7rem;
}

.course-loop-return {
  margin-top: 1.4rem;
  color: #475569;
  font-size: 1rem;
  font-weight: 700;
}

.slidev-layout.section h1::after {
  content: "";
  display: block;
  width: 88px;
  height: 3px;
  margin: 0.55em auto 0;
  border-radius: 2px;
  background: #6b95a3;
}

.slidev-layout.cover {
  background:
    radial-gradient(circle at 85% 15%, rgba(37, 99, 235, 0.15), transparent 32%),
    radial-gradient(circle at 10% 90%, rgba(5, 150, 105, 0.11), transparent 30%),
    white !important;
  color: var(--course-ink) !important;
}

.slidev-layout.cover h1 {
  color: var(--course-ink) !important;
}

.slidev-layout.cover .course-subtitle,
.slidev-layout.cover .course-cover-meta {
  color: var(--course-muted) !important;
}

.dark .slidev-layout,
.slidev-layout.dark {
  color: #e2e8f0;
}

#slidev-goto-dialog {
  display: none !important;
}

/* Chapter 1 dense pilots: scoped so Lessons 01 and 04–42 retain their current design. */
.slidev-layout.chapter-dense {
  padding: 1.45rem 1.8rem !important;
}

.slidev-layout.chapter-dense h1,
.slidev-layout.chapter-terminal h1 {
  font-size: 1.72rem !important;
  margin-bottom: 0.55rem !important;
}

.slidev-layout.chapter-dense h3 {
  font-size: 0.94rem !important;
  margin-bottom: 0.28rem !important;
}

.slidev-layout.chapter-dense p,
.slidev-layout.chapter-dense li {
  font-size: 0.76rem;
  line-height: 1.28;
}

.slidev-layout.chapter-dense li + li {
  margin-top: 0.2rem;
}

.slidev-layout.chapter-dense pre,
.slidev-layout.chapter-dense code,
.slidev-layout.chapter-terminal pre,
.slidev-layout.chapter-terminal code {
  font-size: 0.67rem !important;
  line-height: 1.32 !important;
}

.slidev-layout.chapter-formula-cover {
  padding: 2rem 2.55rem !important;
  background:
    radial-gradient(circle at 88% 12%, rgba(37, 99, 235, 0.17), transparent 32%),
    radial-gradient(circle at 7% 92%, rgba(5, 150, 105, 0.13), transparent 34%),
    linear-gradient(145deg, #ffffff 0%, #f8fafc 100%) !important;
  color: var(--course-ink) !important;
}

.slidev-layout.chapter-formula-cover h1 {
  max-width: 900px;
  color: var(--course-ink) !important;
  font-size: 2.48rem !important;
  letter-spacing: -0.035em;
  margin: 0.65rem 0 0 !important;
}

.chapter-kicker {
  color: var(--course-blue);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.chapter-cover-footer {
  position: absolute;
  left: 2.55rem;
  right: 2.55rem;
  bottom: 1.55rem;
  display: flex;
  justify-content: space-between;
  color: var(--course-muted);
  font-size: 0.68rem;
}

.chapter-equation,
.chapter-context-equation {
  display: flex;
  align-items: stretch;
  gap: 0.8rem;
}

.chapter-equation-term,
.chapter-context-group {
  display: flex;
  min-width: 0;
  flex: 1;
  flex-direction: column;
  justify-content: center;
  border: 2px solid #cbd5e1;
  border-radius: 0.8rem;
  padding: 0.8rem 1rem;
  background: rgba(255, 255, 255, 0.86);
}

.chapter-equation-term strong,
.chapter-context-group strong {
  font-size: 1.42rem;
  line-height: 1.1;
}

.chapter-equation-term span,
.chapter-context-group span {
  margin-top: 0.28rem;
  font-size: 0.78rem;
  font-weight: 700;
}

.chapter-equation-term small,
.chapter-context-group small {
  margin-top: 0.18rem;
  color: var(--course-muted);
  font-size: 0.65rem;
}

.chapter-equation-term.blue,
.chapter-context-group.blue { border-color: #60a5fa; background: #eff6ff; }
.chapter-equation-term.green,
.chapter-context-group.green { border-color: #34d399; background: #ecfdf5; }
.chapter-equation-term.orange { border-color: #fb923c; background: #fff7ed; }

.chapter-equation-sign {
  align-self: center;
  color: #64748b;
  font-size: 1.7rem;
  font-weight: 300;
}

.chapter-cover-thesis {
  margin-top: 0.85rem;
  border-left: 4px solid var(--course-blue);
  padding: 0.45rem 0.7rem;
  color: #334155;
  background: rgba(255, 255, 255, 0.65);
  font-size: 0.82rem;
  font-weight: 700;
}

.chapter-lead {
  max-width: 900px;
  color: #334155;
  font-size: 0.87rem;
  line-height: 1.32;
}

.chapter-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
  border: 1px solid #cbd5e1;
  border-radius: 0.55rem;
  background: rgba(255, 255, 255, 0.9);
  font-size: 0.67rem !important;
  line-height: 1.2;
}

.chapter-table th {
  color: #f8fafc;
  border: 0;
  background: #334155;
  font-weight: 700;
  text-align: left;
}

.chapter-table td {
  border-top: 1px solid #e2e8f0;
  vertical-align: top;
}

.chapter-table th,
.chapter-table td {
  padding: 0.34rem 0.45rem !important;
}

.chapter-table tbody tr:nth-child(even) td { background: #f8fafc; }
.chapter-table-roomy th,
.chapter-table-roomy td { padding: 0.48rem 0.55rem !important; }
.chapter-table-compact th,
.chapter-table-compact td { padding: 0.3rem 0.42rem !important; }

.chapter-panel,
.chapter-callout,
.chapter-mini {
  border: 1.5px solid #cbd5e1;
  border-radius: 0.62rem;
  background: rgba(248, 250, 252, 0.94);
}

.chapter-panel { padding: 0.68rem 0.78rem; }
.chapter-panel ul { padding-left: 1rem; }
.chapter-panel p { margin: 0 !important; }
.chapter-panel.blue,
.chapter-callout.blue,
.chapter-mini.blue { border-color: #93c5fd; background: #eff6ff; }
.chapter-panel.green,
.chapter-callout.green,
.chapter-mini.green { border-color: #6ee7b7; background: #ecfdf5; }
.chapter-panel.orange,
.chapter-callout.orange,
.chapter-mini.orange { border-color: #fdba74; background: #fff7ed; }
.chapter-panel.purple,
.chapter-callout.purple,
.chapter-mini.purple { border-color: #c4b5fd; background: #f5f3ff; }
.chapter-panel.red,
.chapter-callout.red,
.chapter-mini.red { border-color: #fca5a5; background: #fef2f2; }

.chapter-callout {
  padding: 0.48rem 0.65rem;
  font-size: 0.72rem;
  line-height: 1.28;
}

.chapter-conclusion,
.chapter-example {
  margin-top: 0.55rem !important;
  padding-top: 0.45rem;
  border-top: 1px solid rgba(100, 116, 139, 0.25);
  color: #475569;
  font-size: 0.71rem !important;
  line-height: 1.28 !important;
}

.chapter-interface {
  display: grid;
  grid-template-columns: 1.1fr 0.8fr 1fr 0.8fr 1.1fr;
  align-items: stretch;
  gap: 0.55rem;
}

.chapter-interface-world,
.chapter-interface-model {
  display: flex;
  min-height: 96px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px solid #93c5fd;
  border-radius: 0.7rem;
  background: #eff6ff;
  text-align: center;
}

.chapter-interface-model { border-color: #c4b5fd; background: #f5f3ff; }
.chapter-interface-world strong,
.chapter-interface-model strong { font-size: 0.92rem; }
.chapter-interface-world span,
.chapter-interface-model span { margin-top: 0.3rem; color: #64748b; font-size: 0.66rem; }
.chapter-interface-arrow { align-self: center; color: var(--course-blue); font-size: 1.25rem; text-align: center; }
.chapter-interface-arrow span { display: block; margin-bottom: 0.25rem; color: #475569; font-size: 0.62rem; font-weight: 700; }

.chapter-five-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
}

.chapter-five-grid .chapter-panel:nth-child(4),
.chapter-five-grid .chapter-panel:nth-child(5) { grid-column: span 1; }

.chapter-mini {
  display: flex;
  min-height: 62px;
  flex-direction: column;
  justify-content: center;
  padding: 0.5rem 0.6rem;
}

.chapter-mini strong { font-size: 0.74rem; }
.chapter-mini span { margin-top: 0.22rem; color: #475569; font-size: 0.65rem; line-height: 1.22; }

.chapter-code-grid pre { margin: 0.22rem 0 0 !important; }
.chapter-code-block {
  min-height: 92px;
  margin: 0.22rem 0 0 !important;
  border: 1px solid #334155;
  border-radius: 0.45rem;
  padding: 0.55rem 0.65rem !important;
  background: #0f172a !important;
  color: #e2e8f0 !important;
  white-space: pre-wrap;
}
.chapter-code-block.tall { min-height: 245px; }
.chapter-code-block code { color: inherit !important; white-space: pre-wrap !important; }
.chapter-step-label { color: #475569; font-size: 0.66rem; font-weight: 800; letter-spacing: 0.04em; text-transform: uppercase; }
.chapter-tag { display: inline-block; margin-top: 0.55rem; border-radius: 99px; padding: 0.22rem 0.5rem; font-size: 0.61rem; font-weight: 800; }
.chapter-tag.green { color: #047857; background: #d1fae5; }
.chapter-tag.orange { color: #c2410c; background: #ffedd5; }
.chapter-muted { color: #94a3b8; font-size: 0.62rem; font-weight: 400; }

.chapter-figure-large,
.chapter-figure-medium,
.chapter-figure-wide {
  display: block;
  max-width: 100%;
  width: auto;
  margin: 0 auto;
}

.chapter-figure-large { max-height: 305px; }
.chapter-figure-medium { max-height: 275px; }
.chapter-figure-wide { max-height: 260px; }
.chapter-stack { display: flex; flex-direction: column; gap: 0.55rem; }

.chapter-thesis-line,
.chapter-thesis-box {
  border-left: 4px solid var(--course-blue);
  padding: 0.5rem 0.68rem;
  background: #f8fafc;
  color: #334155;
  font-size: 0.76rem;
  font-weight: 700;
  line-height: 1.28;
}

.chapter-thesis-box {
  border: 2px solid #60a5fa;
  border-radius: 0.65rem;
  background: #eff6ff;
  font-size: 0.88rem;
  text-align: center;
}

.chapter-tight-list { padding-left: 1rem; }
.chapter-small { font-size: 0.71rem !important; line-height: 1.28 !important; }
.chapter-source { margin-top: 0.5rem; color: #64748b; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.59rem; }

.chapter-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.7rem;
}

.chapter-metrics > div {
  display: flex;
  min-height: 72px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1.5px solid #93c5fd;
  border-radius: 0.65rem;
  background: #eff6ff;
}

.chapter-metrics strong { color: #1d4ed8; font-size: 1.35rem; line-height: 1; }
.chapter-metrics span { margin-top: 0.25rem; color: #475569; font-size: 0.63rem; }

.chapter-links a {
  display: flex;
  min-height: 48px;
  flex-direction: column;
  justify-content: center;
  border: 1.5px solid #cbd5e1 !important;
  border-radius: 0.55rem;
  padding: 0.45rem 0.65rem;
  background: #fff;
  color: var(--course-ink) !important;
  text-decoration: none !important;
}

.chapter-links strong { font-size: 0.7rem; }
.chapter-links span { margin-top: 0.12rem; color: #64748b; font-size: 0.59rem; }

.slidev-layout.chapter-terminal { padding: 1.55rem 1.9rem !important; }
.slidev-layout.chapter-terminal pre { max-height: 235px; margin-top: 0.6rem !important; }
.chapter-terminal-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.7rem; }
.chapter-terminal-grid > div { display: flex; flex-direction: column; border: 1px solid #334155; border-radius: 0.55rem; padding: 0.55rem 0.65rem; background: #111c31; }
.chapter-terminal-grid strong { color: #67e8f9; font-size: 0.7rem; }
.chapter-terminal-grid span { margin-top: 0.2rem; color: #cbd5e1; font-size: 0.62rem; line-height: 1.24; }

.chapter-prefix-flow {
  display: grid;
  grid-template-columns: 1fr auto 1.7fr auto 1fr;
  align-items: stretch;
  gap: 0.6rem;
}

.chapter-prefix-block {
  display: flex;
  min-height: 118px;
  flex-direction: column;
  justify-content: center;
  border: 2px solid #93c5fd;
  border-radius: 0.7rem;
  padding: 0.65rem 0.75rem;
  background: #eff6ff;
}

.chapter-prefix-block.green { border-color: #6ee7b7; background: #ecfdf5; }
.chapter-prefix-block.purple { border-color: #c4b5fd; background: #f5f3ff; }
.chapter-prefix-block strong { font-size: 0.84rem; }
.chapter-prefix-block span { margin-top: 0.2rem; font-size: 0.66rem; }
.chapter-prefix-block small { margin-top: 0.35rem; color: #64748b; font-size: 0.58rem; }
.chapter-plus,
.chapter-equals { align-self: center; color: #64748b; font-size: 1.4rem; }