:root {
  color-scheme: light;
  font-family: system-ui, sans-serif;
  color: #16222d;
  background: #f6f8fa;
  --market: #b94f1d;
  --market-deep: #7f3011;
  --market-wash: #fff0e6;
  --research: #0f766e;
  --research-deep: #095c56;
  --research-wash: #e7f6f4;
  --paper-raised: #ffffff;
  --ink-muted: #586674;
  --ink-faint: #d9e0e6;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 0;
  margin: 0;
  padding-bottom: 5.5rem;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 10;
  padding: 0.75rem 1rem;
  background: #ffffff;
  border-radius: 0.375rem;
  transform: translateY(-150%);
}

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

#app-header {
  padding: 1rem;
  color: #ffffff;
  background: #16222d;
}

.app-title {
  margin: 0;
  font-size: 1.125rem;
}

#app-main {
  width: min(100%, 48rem);
  min-height: calc(100vh - 9rem);
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

#app-main:focus {
  outline: none;
}

.route-heading {
  margin: 0 0 0.75rem;
  font-size: clamp(2rem, 8vw, 3rem);
}

.route-copy {
  margin: 0;
  font-size: 17px;
  line-height: 1.55;
}

.eyebrow,
.subject-card__eyebrow {
  margin: 0 0 0.35rem;
  color: var(--ink-muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.subject-cards,
.lesson-links {
  display: grid;
  gap: 0.8rem;
  margin-top: 1.5rem;
}

.subject-card,
.lesson-link,
.recall-panel {
  display: grid;
  gap: 0.25rem;
  padding: 1rem;
  text-decoration: none;
  background: var(--paper-raised);
  border: 1px solid var(--ink-faint);
  border-radius: 0.7rem;
  box-shadow: 0 2px 10px rgb(22 34 45 / 0.05);
}

.subject-card strong { font-size: 1.25rem; }
.subject-card--market { border-left: 5px solid var(--market); }
.subject-card--research { border-left: 5px solid var(--research); }
.subject-card--philo { border-left: 5px solid #6456a8; }

.lesson-link {
  grid-template-columns: 2.5rem 1fr auto;
  align-items: center;
  min-height: 4.5rem;
}

.lesson-link:hover,
.lesson-link:focus-visible,
.subject-card:hover,
.subject-card:focus-visible { border-color: currentColor; }
.lesson-link small { display: block; color: var(--ink-muted); }
.lesson-link__number { font-weight: 800; color: var(--ink-muted); }
.back-link { display: inline-block; margin-bottom: 1rem; font-weight: 700; }

.lesson-cheat,
.lesson-core,
.lesson-page > section { margin: 1.5rem 0; }
.lesson-cheat { padding: 1rem; background: #fff8d7; border-radius: 0.7rem; }
.lesson-page h2 { margin-top: 0; font-size: 1.25rem; }
.diagram { margin: 1.5rem 0; overflow: auto; }
.diagram svg { display: block; width: 100%; min-width: 34rem; height: auto; }
.recall-panel { margin-top: 2rem; }
.flashcards { display: grid; gap: 0.5rem; }
.flashcards h3,
.lesson-quiz h3 { margin: 0.75rem 0 0.15rem; font-size: 1rem; }
.flashcard { padding: 0.6rem 0.75rem; background: #f6f8fa; border-radius: 0.45rem; }
.flashcard summary { cursor: pointer; font-weight: 700; }
.flashcard p { margin: 0.6rem 0 0; }
.lesson-quiz { display: grid; gap: 0.8rem; margin-top: 1rem; }
.quiz-question { display: grid; gap: 0.35rem; padding: 0.8rem; border: 1px solid var(--ink-faint); border-radius: 0.5rem; }
.quiz-question label { padding: 0.25rem; }
.quiz-question[data-result='correct'] { border-color: #168448; background: #edfff4; }
.quiz-question[data-result='incorrect'] { border-color: #b94f1d; background: #fff0e6; }
.lesson-quiz button { width: fit-content; min-height: 44px; padding: 0.6rem 1rem; color: #fff; font: inherit; font-weight: 700; background: #16222d; border: 0; border-radius: 0.45rem; cursor: pointer; }
.quiz-score { margin: 0; font-weight: 800; }

.table-scroll {
  max-width: 100%;
  overflow-x: auto;
}

.table-scroll table {
  width: 100%;
  border-collapse: collapse;
}

.table-scroll th,
.table-scroll td {
  min-width: 8rem;
  padding: 0.65rem;
  text-align: left;
  vertical-align: top;
  border: 1px solid var(--ink-faint);
}

.source-warning {
  margin: 1rem 0;
  padding: 1rem;
  background: var(--research-wash);
  border: 2px solid var(--research);
  border-radius: 0.5rem;
}

.source-warning p {
  margin: 0;
  font-weight: 650;
}

.lesson-page {
  font-size: 16px;
  line-height: 1.6;
}

.lesson-source {
  color: var(--ink-muted);
  font-weight: 700;
  text-transform: uppercase;
}

.lesson-traps,
.memory-hooks {
  display: grid;
  gap: 0.65rem;
  padding-left: 1.25rem;
}

.formula,
.formula-working {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}

.slovin-tool {
  margin: 1.5rem 0;
  padding: 1rem;
  background: var(--research-wash);
  border: 1px solid var(--research);
  border-radius: 0.5rem;
}

.slovin-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.slovin-fields label {
  display: grid;
  gap: 0.35rem;
}

.slovin-fields input {
  min-height: 44px;
  width: 100%;
  padding: 0.65rem;
  font: inherit;
}

.research-roadmap ol {
  display: grid;
  gap: 0.5rem;
  padding: 0;
  list-style: none;
}

.research-roadmap button {
  width: 100%;
  min-height: 44px;
  padding: 0.65rem;
  color: inherit;
  font: inherit;
  text-align: left;
  background: #ffffff;
  border: 2px solid var(--research);
  border-radius: 0.5rem;
}

.research-roadmap .roadmap-lesson {
  color: #ffffff;
  background: var(--research);
}

.research-roadmap [data-current='true'] {
  outline: 3px solid #f1b73c;
  outline-offset: 2px;
}

.research-roadmap [data-roadmap-state='before'] {
  opacity: 0.42;
}

.research-diagram text {
  font-family: system-ui, sans-serif;
  fill: #16222d;
}

.research-family rect,
.research-hub circle,
.research-deck-node rect {
  fill: var(--research);
  stroke: var(--research-deep);
  stroke-width: 2;
}

.research-family text,
.research-hub text,
.research-deck-node text {
  fill: #ffffff;
  font-weight: 750;
}

.research-standard-node rect,
.research-mobile-card rect,
.research-summary > rect,
.research-synthesis > rect,
.sampling-grid rect,
.research-decision rect {
  fill: var(--research-wash);
  stroke: var(--research);
  stroke-width: 2;
}

.research-line,
.research-feedback,
.research-correlation,
.research-synthesis path {
  fill: none;
  stroke: var(--research-deep);
  stroke-width: 3;
}

.research-ladder rect,
.research-funnel path,
.research-funnel rect,
.research-variable-map rect {
  fill: var(--research-wash);
  stroke: var(--research);
  stroke-width: 2;
}

.research-synthesis circle,
.research-targets circle {
  fill: color-mix(in srgb, var(--research) 22%, white);
  stroke: var(--research);
  stroke-width: 2;
}

.research-label {
  fill: var(--research-deep);
  font-weight: 800;
}

#bottom-nav {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  padding: 0.5rem;
  background: #ffffff;
  border-top: 1px solid #d9e0e6;
}

#bottom-nav a {
  display: grid;
  flex: 1 0 auto;
  min-width: 4.5rem;
  min-height: 44px;
  padding: 0.5rem;
  place-items: center;
  font-size: 16px;
  text-decoration: none;
}

#bottom-nav a[aria-current='page'] {
  color: #ffffff;
  background: #1f6f8b;
  border-radius: 0.375rem;
}

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

.diagram {
  max-width: 100%;
  margin: 1.5rem 0;
}

.diagram svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.diagram-desktop {
  display: none;
}

.diagram-mobile {
  display: block;
}

.diagram-mobile h4,
.diagram-mobile h5,
.diagram-mobile p {
  margin-top: 0;
}

.diagram-mobile svg text {
  font-family: system-ui, sans-serif;
  font-size: 13px;
}

.mobile-methods-scroll {
  display: flex;
  gap: 0.75rem;
  max-width: 100%;
  overflow-x: auto;
  padding: 0.25rem 0 0.75rem;
  scroll-snap-type: x mandatory;
}

.mobile-method-card {
  flex: 0 0 min(82vw, 18rem);
  min-height: 12rem;
  padding: 1rem;
  border: 1px solid #8a63ad;
  border-left-width: 3px;
  border-radius: 0.5rem;
  background: #f4eef9;
  scroll-snap-align: start;
}

.mobile-method-card small,
.mobile-method-card code {
  display: block;
  margin-top: 0.75rem;
}

.mobile-fallacy-stack {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
}

.mobile-fallacy-panel,
.mobile-philosopher-card {
  min-width: 0;
  padding: 0.875rem;
  border: 1px solid #8a63ad;
  border-radius: 0.5rem;
  background: #f4eef9;
}

.mobile-fallacy-panel code {
  display: inline-block;
  margin: 0.15rem;
  padding: 0.25rem 0.4rem;
  white-space: normal;
  background: #ffffff;
  border-radius: 0.25rem;
}

.mobile-philosopher-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.625rem;
}

.mobile-philosopher-card p,
.mobile-philosopher-card code {
  overflow-wrap: anywhere;
}

.mobile-philosophers blockquote {
  margin: 0.75rem 0 0;
  padding: 1rem;
  background: #e9dcf5;
  border-radius: 0.5rem;
}

.market-heading,
.smart-letter {
  font-weight: 800;
  fill: var(--market-deep);
}

.market-mono,
.market-caption,
.market-dimension,
.market-tag,
.mobile-approach-card code,
.mobile-target-strategy code,
.mobile-position-chip code {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}

.market-caption {
  fill: var(--ink-muted);
}

.market-wash,
.smart-rung rect,
.value-card rect {
  fill: var(--market-wash);
  stroke: var(--market);
  stroke-width: 1.5;
}

.paper-raised,
.market-b2b {
  fill: var(--paper-raised);
  stroke: var(--market);
  stroke-width: 2;
}

.market-hub,
.target-on {
  fill: var(--market);
  stroke: var(--market-deep);
}

.diagram-invert {
  fill: #ffffff;
  font-weight: 800;
}

.market-line,
.market-axis,
.market-grid-line,
.market-divider,
.market-cut,
.market-funnel-edge,
.market-spoke,
.market-serve-arrow,
.market-bracket,
.market-break,
.market-reverses,
.market-clock,
.market-timing-rule,
.market-box,
.market-tick,
.mind-outline {
  fill: none;
  stroke: var(--market-deep);
  stroke-width: 3;
}

.market-line.solid,
.market-serve-arrow,
.market-reverses {
  stroke: var(--market);
  stroke-width: 6;
}

.market-line.hollow {
  stroke-width: 6;
}

.market-overlap,
.micro-node circle {
  fill: var(--market-wash);
  stroke: var(--market);
  stroke-width: 2;
}

.market-lens {
  fill: var(--market);
  opacity: 0.75;
}

.market-ring,
.market-macro-ring {
  fill: none;
  stroke: var(--market);
  stroke-width: 2;
  stroke-dasharray: 10 8;
}

.market-micro-ring,
.market-macro-band {
  fill: var(--market-wash);
  stroke: var(--market);
  stroke-width: 2;
}

.market-macro-band {
  fill: #ffffff;
  stroke-dasharray: 8 6;
}

.market-b2b,
.market-divider {
  stroke: var(--market);
}

.market-dimension {
  fill: var(--market-deep);
  font-size: 11px;
  font-weight: 800;
}

.target-a {
  fill: #f6b893;
}

.target-b {
  fill: #df7845;
}

.target-c {
  fill: #a64017;
}

.target-off {
  fill: var(--ink-faint);
}

.mobile-market-timing {
  display: flex;
  flex-direction: column;
}

.mobile-approach-stack,
.mobile-research-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.625rem;
}

.mobile-approach-header {
  position: sticky;
  top: 0;
  z-index: 1;
  margin: 0;
  padding: 0.55rem 0.75rem;
  color: #ffffff;
  background: var(--market-deep);
}

.mobile-approach-card,
.mobile-value-card,
.mobile-market-pair,
.mobile-target-strategy,
.mobile-position-chip {
  min-width: 0;
  padding: 0.75rem;
  border: 1px solid var(--market);
  border-radius: 0.5rem;
  background: var(--market-wash);
}

.mobile-approach-card,
.mobile-value-card {
  display: grid;
  gap: 0.35rem;
}

.mobile-blueprint-strip,
.mobile-position-formula {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.5rem;
}

.mobile-blueprint-strip span,
.mobile-blueprint-strip strong {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.65rem;
  border: 1px solid var(--market);
  background: #ffffff;
}

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

.mobile-research-grid svg {
  grid-column: 1 / -1;
}

.mobile-market-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  margin-bottom: 0.625rem;
}

.mobile-market-pair h5 {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--market-deep);
}

.mobile-target-strategy {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.mobile-position-chip {
  display: flex;
  gap: 0.5rem;
  overflow-wrap: anywhere;
}

.mobile-stp-targeting,
.mobile-stp-positioning h4 {
  margin: 1rem 0 0.5rem;
  color: var(--market-deep);
}

.mobile-stp-positioning {
  margin-top: 1rem;
  padding: 0.875rem;
  border: 1px solid var(--market);
  border-radius: 0.5rem;
  background: #ffffff;
}

.mobile-mind-map {
  display: grid;
  gap: 0.4rem;
  width: min(100%, 15rem);
  margin: 0.75rem auto;
  padding: 1.5rem 1rem;
  text-align: center;
  border: 2px solid var(--market-deep);
  border-radius: 50% 50% 45% 45%;
}

.mobile-mind-map span {
  padding: 0.4rem;
  color: #ffffff;
  background: var(--market);
  border-radius: 0.25rem;
}

.mobile-mind-map small {
  color: var(--ink-muted);
}

@media (min-width: 481px) {
  .marketing-phone-desktop {
    display: block;
  }

  .marketing-phone-mobile {
    display: none;
  }
}

@media (min-width: 768px) {
  #app-header {
    padding-inline: max(2rem, calc((100vw - 48rem) / 2));
  }

  #bottom-nav {
    justify-content: center;
  }

  #bottom-nav a {
    flex: 0 1 8rem;
  }

  .diagram-desktop:not(.marketing-l1-desktop):not(.marketing-phone-desktop):not(.marketing-l3-desktop),
  .marketing-l1-desktop {
    display: block;
  }

  .diagram-mobile:not(.marketing-l1-mobile):not(.marketing-phone-mobile):not(.marketing-l3-mobile),
  .marketing-l1-mobile {
    display: none;
  }

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

  .roadmap-snake li:nth-child(4n + 1),
  .roadmap-snake li:nth-child(4n + 4) {
    grid-column: 1;
  }

  .roadmap-snake li:nth-child(4n + 2),
  .roadmap-snake li:nth-child(4n + 3) {
    grid-column: 2;
  }
}

@media (max-width: 480px) {
  .slovin-fields {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 769px) {
  .marketing-l3-desktop {
    display: block;
  }

  .marketing-l3-mobile {
    display: none;
  }
}