:root {
  --paper: #f3efe3;
  --paper-deep: #e8e0cf;
  --paper-light: #fbf8ef;
  --ink: #172522;
  --ink-soft: #58615d;
  --navy: #133c55;
  --navy-deep: #0b283b;
  --teal: #157a6e;
  --orange: #eb6b3a;
  --yellow: #f4c95d;
  --lime: #c9df75;
  --blue: #65a7c5;
  --red: #c94c3d;
  --line: rgba(23, 37, 34, 0.18);
  --line-strong: rgba(23, 37, 34, 0.42);
  --shadow: 0 20px 50px rgba(21, 39, 34, 0.12);
  --display: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --body: "Avenir Next", Avenir, "Trebuchet MS", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --rail-width: 244px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    linear-gradient(rgba(23, 37, 34, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 100% 30px;
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.55;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

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

::selection {
  color: var(--ink);
  background: var(--yellow);
}

.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;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  color: white;
  background: var(--navy-deep);
  border-radius: 4px;
  transform: translateY(-160%);
  transition: transform 160ms ease;
}

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

.paper-noise {
  position: fixed;
  inset: 0;
  z-index: 100;
  pointer-events: none;
  opacity: 0.22;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.08'/%3E%3C/svg%3E");
}

.rail {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 20;
  width: var(--rail-width);
  display: flex;
  flex-direction: column;
  padding: 26px 20px 22px;
  color: #f8f1df;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px 10px),
    var(--navy-deep);
  border-right: 1px solid rgba(255, 255, 255, 0.12);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 0 0 24px;
  color: inherit;
  text-align: left;
  background: none;
  border: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.17);
  cursor: pointer;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  color: var(--navy-deep);
  background: var(--yellow);
  border-radius: 50% 50% 50% 12%;
  font-family: var(--display);
  font-size: 28px;
  font-style: italic;
  font-weight: 800;
  transform: rotate(-5deg);
}

.brand-copy {
  display: grid;
  line-height: 1.2;
}

.brand-copy strong {
  font-family: var(--display);
  font-size: 20px;
}

.brand-copy small {
  margin-top: 4px;
  color: rgba(248, 241, 223, 0.58);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.rail-nav {
  display: grid;
  gap: 3px;
  margin-top: 27px;
}

.nav-item {
  position: relative;
  display: grid;
  grid-template-columns: 30px 1fr;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 12px 10px;
  color: rgba(248, 241, 223, 0.66);
  text-align: left;
  background: transparent;
  border: 0;
  border-radius: 5px;
  cursor: pointer;
  transition: color 160ms ease, background 160ms ease, transform 160ms ease;
}

.nav-item:hover {
  color: white;
  background: rgba(255, 255, 255, 0.07);
  transform: translateX(3px);
}

.nav-item.is-active {
  color: white;
  background: rgba(255, 255, 255, 0.1);
}

.nav-item.is-active::before {
  content: "";
  position: absolute;
  left: -20px;
  width: 5px;
  height: 23px;
  background: var(--orange);
  border-radius: 0 4px 4px 0;
}

.nav-index {
  color: var(--yellow);
  font-family: var(--mono);
  font-size: 10px;
}

.rail-progress {
  margin-top: auto;
  padding: 16px 2px 18px;
}

.progress-copy {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 9px;
  color: rgba(248, 241, 223, 0.63);
  font-size: 11px;
}

.progress-copy strong {
  color: var(--yellow);
  font-family: var(--mono);
  font-size: 12px;
}

.progress-track {
  height: 5px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 10px;
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--orange), var(--yellow));
  border-radius: inherit;
  transition: width 400ms cubic-bezier(0.2, 0.9, 0.3, 1);
}

.source-button {
  padding: 10px 4px 2px;
  color: rgba(248, 241, 223, 0.65);
  text-align: left;
  background: none;
  border: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  cursor: pointer;
  font-size: 12px;
}

.source-button:hover {
  color: white;
}

main {
  min-height: 100vh;
  margin-left: var(--rail-width);
}

.topbar {
  min-height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px clamp(26px, 4vw, 64px);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.breadcrumb {
  margin: 0;
  font-family: var(--display);
  font-size: 18px;
  font-style: italic;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.status-chip {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 10px;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.45);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.status-chip span {
  width: 7px;
  height: 7px;
  background: var(--teal);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(21, 122, 110, 0.12);
}

.icon-button {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  padding: 0;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 50%;
  cursor: pointer;
  transition: background 150ms ease, transform 150ms ease;
}

.icon-button:hover {
  background: var(--yellow);
  transform: rotate(-8deg);
}

.view {
  min-height: calc(100vh - 84px);
  padding: clamp(32px, 5vw, 72px) clamp(26px, 5vw, 76px) 80px;
  animation: page-enter 450ms both;
}

.view[hidden] {
  display: none;
}

@keyframes page-enter {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.07fr) minmax(390px, 0.93fr);
  align-items: stretch;
  gap: clamp(34px, 5vw, 74px);
}

.hero-copy {
  padding: 12px 0 18px;
}

.kicker {
  display: flex;
  align-items: center;
  gap: 11px;
  margin: 0 0 22px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.kicker span {
  padding: 4px 7px 3px;
  color: var(--paper-light);
  background: var(--orange);
  border-radius: 2px;
}

h1,
h2,
h3,
p {
  text-wrap: pretty;
}

.hero-copy h1,
.section-intro h1 {
  margin: 0;
  max-width: 760px;
  font-family: var(--display);
  font-weight: 550;
  line-height: 0.99;
  letter-spacing: -0.045em;
}

.hero-copy h1 {
  font-size: clamp(54px, 6.2vw, 94px);
}

.hero-copy h1 em {
  position: relative;
  z-index: 1;
  color: var(--navy);
  font-weight: 650;
}

.hero-copy h1 em::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: -2%;
  right: -4%;
  bottom: 5%;
  height: 20%;
  background: var(--yellow);
  transform: rotate(-1deg);
  opacity: 0.72;
}

.hero-lead {
  max-width: 660px;
  margin: 26px 0 0;
  color: var(--ink-soft);
  font-size: clamp(16px, 1.4vw, 20px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}

.button {
  min-height: 44px;
  padding: 11px 17px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  cursor: pointer;
  font-weight: 650;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: white;
  background: var(--ink);
  box-shadow: 5px 5px 0 var(--orange);
}

.button-primary:hover {
  box-shadow: 3px 3px 0 var(--orange);
}

.button-ghost {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.35);
}

.button-ghost:hover {
  background: var(--paper-light);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(100px, 1fr));
  max-width: 620px;
  margin-top: 45px;
  border-top: 1px solid var(--line-strong);
}

.hero-metrics div {
  display: grid;
  padding: 13px 14px 0 0;
  border-right: 1px solid var(--line);
}

.hero-metrics div + div {
  padding-left: 17px;
}

.hero-metrics div:last-child {
  border-right: 0;
}

.hero-metrics strong {
  font-family: var(--display);
  font-size: 28px;
  line-height: 1;
}

.hero-metrics span {
  margin-top: 5px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.domain-compass {
  position: relative;
  min-height: 500px;
  overflow: hidden;
  padding: 26px;
  color: #f9f2df;
  background:
    radial-gradient(circle at 80% 10%, rgba(101, 167, 197, 0.27), transparent 33%),
    linear-gradient(150deg, var(--navy) 0%, var(--navy-deep) 72%);
  border-radius: 3px 28px 3px 3px;
  box-shadow: 14px 14px 0 rgba(235, 107, 58, 0.38);
}

.domain-compass::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.13;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.3) 1px, transparent 1px);
  background-size: 28px 28px;
}

.compass-heading {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.compass-heading h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 25px;
  font-style: italic;
  font-weight: 500;
}

.stamp {
  padding: 5px 8px;
  color: var(--yellow);
  border: 1px solid rgba(244, 201, 93, 0.55);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transform: rotate(-2deg);
}

.route-map {
  position: relative;
  height: 340px;
  margin-top: 25px;
}

.route-line {
  position: absolute;
  top: 30px;
  left: 17%;
  width: 64%;
  height: 275px;
  border: 4px solid rgba(244, 201, 93, 0.62);
  border-left-color: transparent;
  border-radius: 0 120px 120px 0;
  transform: rotate(7deg);
}

.route-line::after {
  content: "";
  position: absolute;
  left: -9%;
  bottom: -4px;
  width: 38%;
  border-bottom: 4px solid rgba(244, 201, 93, 0.62);
  transform: rotate(-12deg);
  transform-origin: right;
}

.route-stop {
  position: absolute;
  display: grid;
  padding: 0;
  color: #f9f2df;
  text-align: left;
  background: transparent;
  border: 0;
  cursor: pointer;
}

.route-stop:hover .stop-dot {
  transform: scale(1.3);
  background: var(--orange);
}

.route-stop small {
  color: rgba(249, 242, 223, 0.55);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.route-stop strong {
  margin-top: 2px;
  font-family: var(--display);
  font-size: 17px;
}

.stop-dot {
  position: absolute;
  width: 16px;
  height: 16px;
  background: var(--paper-light);
  border: 4px solid var(--teal);
  border-radius: 50%;
  transition: transform 170ms ease, background 170ms ease;
}

.stop-problem { top: 44px; left: 5%; padding-left: 27px; }
.stop-problem .stop-dot { left: 0; top: 7px; }
.stop-language { top: 78px; right: 4%; padding-right: 26px; text-align: right; }
.stop-language .stop-dot { right: 0; top: 8px; }
.stop-boundary { top: 212px; right: 5%; padding-right: 27px; text-align: right; }
.stop-boundary .stop-dot { right: 0; top: 8px; }
.stop-code { bottom: 13px; left: 7%; padding-left: 27px; }
.stop-code .stop-dot { left: 0; top: 8px; }

.compass-note {
  position: absolute;
  right: 25px;
  bottom: 22px;
  width: min(260px, 56%);
  padding: 12px 14px;
  color: var(--ink);
  background: var(--yellow);
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.18);
  transform: rotate(-1.5deg);
}

.compass-note span {
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.compass-note p {
  margin: 4px 0 0;
  font-family: var(--display);
  font-size: 15px;
  line-height: 1.25;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: minmax(340px, 1.25fr) minmax(240px, 0.75fr) minmax(260px, 0.8fr);
  gap: 16px;
  margin-top: clamp(46px, 6vw, 82px);
}

.panel {
  background: rgba(251, 248, 239, 0.72);
  border: 1px solid var(--line-strong);
  box-shadow: 0 5px 0 rgba(23, 37, 34, 0.05);
}

.today-panel,
.pulse-panel,
.trap-panel,
.decision-panel,
.rules-panel,
.case-map {
  padding: 24px;
}

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.panel-heading h2,
.rules-panel h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 25px;
  font-weight: 600;
  line-height: 1.08;
}

.time-badge,
.challenge-score {
  padding: 6px 8px;
  color: var(--navy);
  background: var(--yellow);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 800;
  transform: rotate(2deg);
}

.study-plan {
  margin: 23px 0 18px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.study-plan li {
  display: grid;
  grid-template-columns: 54px 1fr;
  align-items: center;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.study-plan span {
  color: var(--orange);
  font-family: var(--mono);
  font-size: 9px;
}

.study-plan p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
}

.study-plan strong {
  color: var(--ink);
}

.text-link {
  padding: 0;
  color: var(--navy);
  background: none;
  border: 0;
  border-bottom: 1px solid var(--navy);
  cursor: pointer;
  font-weight: 700;
  font-size: 12px;
}

.mastery-ring {
  --value: 0;
  width: 132px;
  height: 132px;
  display: grid;
  place-items: center;
  margin: 22px auto;
  background: conic-gradient(var(--teal) calc(var(--value) * 1%), var(--paper-deep) 0);
  border-radius: 50%;
  position: relative;
}

.mastery-ring::after {
  content: "";
  position: absolute;
  inset: 10px;
  background: var(--paper-light);
  border-radius: 50%;
}

.mastery-ring div {
  position: relative;
  z-index: 1;
  display: grid;
  text-align: center;
  line-height: 1;
}

.mastery-ring strong {
  font-family: var(--display);
  font-size: 31px;
}

.mastery-ring span {
  margin-top: 5px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pulse-list {
  margin: 0;
}

.pulse-list div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-top: 1px solid var(--line);
  font-size: 11px;
}

.pulse-list dt {
  color: var(--ink-soft);
}

.pulse-list dd {
  margin: 0;
  font-family: var(--mono);
  font-weight: 800;
}

.trap-panel {
  position: relative;
  overflow: hidden;
  color: #fff6e6;
  background: var(--orange);
  border-color: var(--ink);
}

.trap-panel::after {
  content: "?";
  position: absolute;
  right: -12px;
  bottom: -75px;
  color: rgba(255, 255, 255, 0.11);
  font-family: var(--display);
  font-size: 200px;
  font-weight: 900;
}

.trap-panel .eyebrow {
  color: rgba(255, 246, 230, 0.72);
}

.trap-panel blockquote {
  position: relative;
  z-index: 1;
  margin: 17px 0;
  font-family: var(--display);
  font-size: 21px;
  font-style: italic;
  line-height: 1.25;
}

.trap-panel p:not(.eyebrow) {
  position: relative;
  z-index: 1;
  font-size: 12px;
}

.trap-panel .text-link {
  position: relative;
  z-index: 1;
  color: white;
  border-color: white;
}

.section-intro {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 38px;
}

.section-intro h1 {
  font-size: clamp(48px, 5.4vw, 78px);
}

.section-intro > div > p:last-child {
  max-width: 690px;
  margin: 16px 0 0;
  color: var(--ink-soft);
}

.search-box {
  flex: 0 1 350px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 3px 12px;
  background: rgba(251, 248, 239, 0.76);
  border: 1px solid var(--line-strong);
  border-radius: 3px;
}

.search-box input {
  width: 100%;
  padding: 10px 0;
  color: var(--ink);
  background: transparent;
  border: 0;
  outline: none;
}

.search-box:focus-within {
  box-shadow: 4px 4px 0 var(--yellow);
}

.learn-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  align-items: start;
  gap: 25px;
}

.learn-layout > * {
  min-width: 0;
}

.lesson-index {
  position: sticky;
  top: 18px;
  width: 100%;
  min-width: 0;
}

.segmented-control,
.map-toggle,
.flash-filters {
  display: inline-flex;
  padding: 3px;
  background: var(--paper-deep);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.segmented-control {
  width: 100%;
}

.segmented-control button,
.map-toggle button,
.flash-filters button {
  padding: 8px 10px;
  color: var(--ink-soft);
  background: transparent;
  border: 0;
  border-radius: 2px;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.segmented-control button {
  flex: 1;
}

.segmented-control button.is-active,
.map-toggle button.is-active,
.flash-filters button.is-active {
  color: white;
  background: var(--navy);
}

#lesson-list {
  margin-top: 14px;
  border-top: 1px solid var(--line-strong);
}

.lesson-nav-button {
  display: grid;
  grid-template-columns: 26px 1fr 18px;
  align-items: center;
  gap: 9px;
  width: 100%;
  padding: 13px 5px;
  color: var(--ink-soft);
  text-align: left;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  font-size: 12px;
}

.lesson-nav-button:hover,
.lesson-nav-button.is-active {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.25);
}

.lesson-nav-button.is-active {
  border-left: 4px solid var(--orange);
  padding-left: 8px;
}

.lesson-nav-number {
  color: var(--orange);
  font-family: var(--mono);
  font-size: 9px;
}

.lesson-check {
  width: 14px;
  height: 14px;
  display: grid;
  place-items: center;
  color: white;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  font-size: 8px;
}

.lesson-nav-button.is-complete .lesson-check {
  background: var(--teal);
  border-color: var(--teal);
}

.lesson-sheet {
  min-height: 650px;
  width: 100%;
  min-width: 0;
  padding: clamp(26px, 4vw, 58px);
  background:
    linear-gradient(90deg, transparent 45px, rgba(235, 107, 58, 0.24) 46px, transparent 47px),
    repeating-linear-gradient(0deg, transparent 0 29px, rgba(23, 37, 34, 0.055) 30px),
    var(--paper-light);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow);
  overflow-wrap: anywhere;
}

.lesson-header {
  position: relative;
  padding-bottom: 24px;
  border-bottom: 2px solid var(--ink);
}

.lesson-meta {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-header h2 {
  max-width: 820px;
  margin: 17px 0 0;
  font-family: var(--display);
  font-size: clamp(38px, 4vw, 61px);
  font-weight: 580;
  line-height: 1.02;
  letter-spacing: -0.035em;
}

.lesson-definition {
  max-width: 820px;
  margin: 25px 0 0;
  color: var(--navy);
  font-family: var(--display);
  font-size: clamp(20px, 2vw, 28px);
  line-height: 1.33;
}

.lesson-body {
  margin-top: 32px;
}

.lesson-body > p {
  max-width: 850px;
  color: var(--ink-soft);
  font-size: 15px;
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 28px 0;
}

.concept-tile {
  min-height: 150px;
  padding: 18px;
  background: rgba(243, 239, 227, 0.7);
  border: 1px solid var(--line);
  border-top: 5px solid var(--tile-color, var(--teal));
}

.concept-tile small {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.concept-tile h3 {
  margin: 7px 0;
  font-family: var(--display);
  font-size: 21px;
}

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

.contrast-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin: 30px 0;
  border: 1px solid var(--ink);
}

.contrast-side {
  padding: 22px;
}

.contrast-side + .contrast-side {
  border-left: 1px solid var(--ink);
}

.contrast-side:first-child {
  background: rgba(201, 223, 117, 0.29);
}

.contrast-side:last-child {
  background: rgba(101, 167, 197, 0.22);
}

.contrast-side span {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.contrast-side h3 {
  margin: 8px 0 12px;
  font-family: var(--display);
  font-size: 25px;
}

.contrast-side ul,
.lesson-list {
  margin: 0;
  padding-left: 18px;
  color: var(--ink-soft);
  font-size: 13px;
}

.contrast-side li + li,
.lesson-list li + li {
  margin-top: 7px;
}

.exam-trap {
  position: relative;
  margin: 30px 0;
  padding: 20px 22px 20px 56px;
  color: #fff8eb;
  background: var(--navy);
  border-radius: 2px;
}

.exam-trap::before {
  content: "!";
  position: absolute;
  left: 19px;
  top: 16px;
  width: 23px;
  height: 23px;
  display: grid;
  place-items: center;
  color: var(--navy);
  background: var(--yellow);
  border-radius: 50%;
  font-family: var(--display);
  font-weight: 900;
}

.exam-trap strong {
  display: block;
  margin-bottom: 4px;
  color: var(--yellow);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.exam-trap p {
  margin: 0;
  font-size: 13px;
}

.lesson-example {
  margin: 28px 0;
  padding: 21px;
  background: rgba(244, 201, 93, 0.19);
  border: 1px dashed var(--line-strong);
}

.lesson-example strong {
  font-family: var(--display);
  font-size: 19px;
}

.lesson-example p {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 13px;
}

.lesson-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 42px;
  padding-top: 20px;
  border-top: 1px solid var(--line-strong);
}

.lesson-source {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 9px;
}

.complete-button {
  min-width: 190px;
}

.complete-button.is-complete {
  color: white;
  background: var(--teal);
  box-shadow: none;
}

.case-intro {
  align-items: center;
}

.case-facts {
  display: grid;
  grid-template-columns: repeat(3, auto);
  border: 1px solid var(--line-strong);
  background: rgba(251, 248, 239, 0.65);
}

.case-facts span {
  display: grid;
  padding: 12px 16px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 8px;
  text-align: center;
  text-transform: uppercase;
}

.case-facts span + span {
  border-left: 1px solid var(--line);
}

.case-facts strong {
  color: var(--ink);
  font-family: var(--display);
  font-size: 26px;
}

.case-map {
  padding: 28px;
}

.map-heading {
  align-items: center;
}

.case-map-canvas {
  min-height: 390px;
  display: grid;
  place-items: center;
  margin-top: 22px;
  overflow: auto;
  background:
    linear-gradient(rgba(23, 37, 34, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 37, 34, 0.05) 1px, transparent 1px),
    rgba(255, 255, 255, 0.28);
  background-size: 24px 24px;
  border: 1px solid var(--line);
}

.subdomain-map {
  width: min(100%, 980px);
  display: grid;
  grid-template-columns: 1.25fr 1fr 1fr;
  gap: 13px;
  padding: 30px;
}

.subdomain-node {
  position: relative;
  min-height: 112px;
  padding: 18px;
  background: var(--paper-light);
  border: 1px solid var(--ink);
  box-shadow: 5px 5px 0 var(--node-shadow, var(--line));
}

.subdomain-node.core {
  grid-row: span 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: white;
  background: var(--navy);
  --node-shadow: var(--yellow);
}

.subdomain-node.support { --node-shadow: var(--lime); }
.subdomain-node.generic { --node-shadow: var(--blue); }

.subdomain-node small {
  color: var(--orange);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.subdomain-node.core small { color: var(--yellow); }

.subdomain-node strong {
  display: block;
  margin-top: 7px;
  font-family: var(--display);
  font-size: 20px;
  line-height: 1.15;
}

.subdomain-node p {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 11px;
}

.subdomain-node.core p { color: rgba(255, 255, 255, 0.72); }

.context-svg {
  min-width: 840px;
  width: 100%;
  height: auto;
}

.context-edge {
  fill: none;
  stroke: rgba(19, 60, 85, 0.48);
  stroke-width: 2;
  marker-end: url(#arrow);
}

.context-edge.partnership {
  stroke: var(--orange);
  stroke-width: 3;
}

.context-node rect {
  fill: var(--paper-light);
  stroke: var(--ink);
  stroke-width: 1.5;
}

.context-node.core rect {
  fill: var(--navy);
}

.context-node text {
  fill: var(--ink);
  font-family: var(--body);
  font-size: 12px;
  font-weight: 700;
  text-anchor: middle;
}

.context-node.core text {
  fill: white;
}

.edge-label {
  fill: var(--ink-soft);
  font-family: var(--mono);
  font-size: 8px;
  text-anchor: middle;
}

.map-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 14px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 9px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.legend-swatch {
  width: 14px;
  height: 8px;
  background: var(--swatch, var(--teal));
  border: 1px solid var(--ink);
}

.case-workbench {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.6fr);
  gap: 18px;
  margin-top: 18px;
}

.challenge-card {
  margin-top: 21px;
}

.challenge-card blockquote {
  margin: 0;
  padding: 21px;
  background: var(--paper-light);
  border-left: 5px solid var(--orange);
  font-family: var(--display);
  font-size: 21px;
  line-height: 1.35;
}

.challenge-prompt {
  margin: 18px 0 10px;
  font-weight: 700;
  font-size: 13px;
}

.challenge-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.challenge-option {
  padding: 11px 9px;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line-strong);
  cursor: pointer;
  font-size: 11px;
}

.challenge-option:hover {
  background: var(--yellow);
}

.challenge-option.correct {
  color: white;
  background: var(--teal);
  border-color: var(--teal);
}

.challenge-option.wrong {
  color: white;
  background: var(--red);
  border-color: var(--red);
}

.challenge-feedback {
  min-height: 52px;
  margin: 14px 0 0;
  padding: 11px 13px;
  color: var(--ink-soft);
  background: rgba(201, 223, 117, 0.19);
  border: 1px dashed var(--line-strong);
  font-size: 12px;
}

.challenge-navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-top: 15px;
}

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

.challenge-dot {
  width: 7px;
  height: 7px;
  background: var(--paper-deep);
  border: 1px solid var(--line-strong);
  border-radius: 50%;
}

.challenge-dot.done { background: var(--teal); }
.challenge-dot.active { box-shadow: 0 0 0 3px var(--yellow); }

.rule-stack {
  display: grid;
  gap: 8px;
  margin-top: 22px;
}

.rule-card {
  display: grid;
  grid-template-columns: 28px 1fr;
  align-items: center;
  gap: 8px;
  padding: 13px;
  text-align: left;
  background: transparent;
  border: 1px solid var(--line);
  cursor: pointer;
}

.rule-card span {
  grid-row: span 2;
  color: var(--orange);
  font-family: var(--mono);
  font-size: 9px;
}

.rule-card strong {
  font-family: var(--display);
  font-size: 16px;
}

.rule-card small {
  display: none;
  color: var(--ink-soft);
  line-height: 1.35;
}

.rule-card.is-open {
  background: var(--paper-light);
  border-left: 4px solid var(--teal);
}

.rule-card.is-open small {
  display: block;
}

.margin-note {
  margin: 22px 0 0;
  padding: 13px;
  color: var(--navy);
  background: var(--yellow);
  font-family: var(--display);
  font-size: 14px;
  font-style: italic;
  transform: rotate(-1deg);
}

.flash-intro {
  align-items: center;
}

.flash-filters {
  flex-wrap: wrap;
  justify-content: center;
}

.flash-stage {
  width: min(820px, 100%);
  margin: 55px auto 0;
  perspective: 1200px;
}

.flash-counter {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.flashcard {
  position: relative;
  width: 100%;
  height: 390px;
  padding: 0;
  background: transparent;
  border: 0;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 560ms cubic-bezier(0.2, 0.75, 0.25, 1);
}

.flashcard.is-flipped {
  transform: rotateY(180deg);
}

.flash-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: clamp(30px, 7vw, 75px);
  backface-visibility: hidden;
  border: 1px solid var(--ink);
  box-shadow: 13px 13px 0 var(--orange);
}

.flash-front {
  color: #fff8ea;
  background:
    radial-gradient(circle at 88% 13%, rgba(244, 201, 93, 0.19), transparent 25%),
    var(--navy);
}

.flash-back {
  color: var(--ink);
  background:
    repeating-linear-gradient(0deg, transparent 0 28px, rgba(23, 37, 34, 0.05) 29px),
    var(--paper-light);
  transform: rotateY(180deg);
}

.flash-face small {
  margin-bottom: 25px;
  color: var(--yellow);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.flash-back small { color: var(--orange); }

.flash-face strong {
  max-width: 650px;
  font-family: var(--display);
  font-size: clamp(30px, 4vw, 47px);
  font-weight: 550;
  line-height: 1.15;
  text-align: center;
}

.flash-face em {
  position: absolute;
  bottom: 25px;
  color: rgba(255, 248, 234, 0.55);
  font-family: var(--mono);
  font-size: 9px;
  font-style: normal;
}

.flash-back em {
  max-width: 560px;
  color: var(--ink-soft);
}

.flash-actions {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 9px;
  margin-top: 28px;
}

.button-review {
  color: var(--ink);
  background: var(--yellow);
}

.button-know {
  color: white;
  background: var(--teal);
}

.keyboard-hint {
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 9px;
  text-align: center;
}

kbd {
  padding: 2px 5px;
  color: var(--ink);
  background: var(--paper-light);
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  box-shadow: 0 2px 0 var(--line-strong);
}

.exam-intro {
  align-items: center;
}

.exam-timer {
  min-width: 130px;
  padding: 13px 18px;
  color: var(--yellow);
  background: var(--navy-deep);
  border: 1px solid var(--ink);
  box-shadow: 6px 6px 0 var(--orange);
  font-family: var(--mono);
  font-size: 27px;
  font-weight: 800;
  text-align: center;
}

.exam-shell {
  width: min(900px, 100%);
  margin: 48px auto 0;
}

.exam-setup {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  border: 1px solid var(--ink);
  background: var(--paper-light);
  box-shadow: 12px 12px 0 rgba(19, 60, 85, 0.16);
}

.exam-setup-copy {
  padding: clamp(28px, 5vw, 55px);
}

.exam-setup-copy h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(35px, 4vw, 52px);
  font-weight: 580;
  line-height: 1.05;
}

.exam-setup-copy > p {
  color: var(--ink-soft);
}

.exam-specs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 28px 0;
  border-block: 1px solid var(--line);
}

.exam-specs div {
  display: grid;
  padding: 13px 10px;
  text-align: center;
}

.exam-specs div + div {
  border-left: 1px solid var(--line);
}

.exam-specs strong {
  font-family: var(--display);
  font-size: 25px;
}

.exam-specs span {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 8px;
  text-transform: uppercase;
}

.exam-setup-aside {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 30px;
  color: white;
  background: var(--navy);
}

.exam-setup-aside span {
  color: var(--yellow);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.exam-setup-aside blockquote {
  margin: 16px 0 0;
  font-family: var(--display);
  font-size: 22px;
  font-style: italic;
  line-height: 1.3;
}

.question-card {
  padding: clamp(25px, 5vw, 48px);
  background: var(--paper-light);
  border: 1px solid var(--ink);
  box-shadow: 10px 10px 0 rgba(19, 60, 85, 0.14);
}

.question-progress {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.question-bar {
  height: 4px;
  margin: 12px 0 30px;
  overflow: hidden;
  background: var(--paper-deep);
}

.question-bar span {
  display: block;
  height: 100%;
  background: var(--orange);
  transition: width 250ms ease;
}

.question-card h2 {
  margin: 0 0 28px;
  font-family: var(--display);
  font-size: clamp(28px, 3.2vw, 42px);
  font-weight: 550;
  line-height: 1.2;
}

.answer-options {
  display: grid;
  gap: 9px;
}

.answer-option {
  position: relative;
  display: grid;
  grid-template-columns: 30px 1fr;
  align-items: center;
  gap: 12px;
  padding: 14px;
  color: var(--ink-soft);
  text-align: left;
  background: transparent;
  border: 1px solid var(--line-strong);
  cursor: pointer;
}

.answer-option:hover {
  color: var(--ink);
  background: rgba(244, 201, 93, 0.14);
}

.answer-option.is-selected {
  color: var(--ink);
  background: rgba(244, 201, 93, 0.3);
  border-color: var(--ink);
  box-shadow: 4px 4px 0 var(--yellow);
}

.option-letter {
  width: 25px;
  height: 25px;
  display: grid;
  place-items: center;
  color: var(--ink);
  background: var(--paper-deep);
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 10px;
}

.question-navigation {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 30px;
  padding-top: 19px;
  border-top: 1px solid var(--line);
}

.question-navigation .button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
}

.result-hero {
  display: grid;
  grid-template-columns: 230px 1fr;
  overflow: hidden;
  background: var(--paper-light);
  border: 1px solid var(--ink);
  box-shadow: 11px 11px 0 rgba(19, 60, 85, 0.16);
}

.result-score {
  display: grid;
  place-items: center;
  padding: 35px;
  color: white;
  background: var(--navy);
  text-align: center;
}

.result-score strong {
  font-family: var(--display);
  font-size: 71px;
  line-height: 0.9;
}

.result-score span {
  margin-top: 11px;
  color: var(--yellow);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.result-copy {
  padding: clamp(27px, 5vw, 52px);
}

.result-copy h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 42px;
  font-weight: 580;
}

.result-copy p {
  color: var(--ink-soft);
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 22px;
}

.review-list {
  display: grid;
  gap: 12px;
  margin-top: 32px;
}

.review-item {
  padding: 20px;
  background: rgba(251, 248, 239, 0.75);
  border: 1px solid var(--line-strong);
}

.review-item.correct { border-left: 5px solid var(--teal); }
.review-item.incorrect { border-left: 5px solid var(--red); }

.review-item > span {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 9px;
  text-transform: uppercase;
}

.review-item h3 {
  margin: 8px 0;
  font-family: var(--display);
  font-size: 21px;
}

.review-item p {
  margin: 6px 0 0;
  color: var(--ink-soft);
  font-size: 12px;
}

.review-item strong { color: var(--ink); }

.source-dialog {
  width: min(920px, calc(100% - 30px));
  max-height: min(760px, calc(100vh - 30px));
  padding: 0;
  color: var(--ink);
  background: var(--paper-light);
  border: 1px solid var(--ink);
  box-shadow: 18px 18px 0 rgba(235, 107, 58, 0.55);
}

.source-dialog::backdrop {
  background: rgba(11, 40, 59, 0.68);
  backdrop-filter: blur(4px);
}

.dialog-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
  padding: 28px;
  border-bottom: 1px solid var(--line-strong);
}

.dialog-heading h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 35px;
}

.source-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 25px;
  padding: 28px;
}

.source-columns h3 {
  margin: 0 0 14px;
  font-family: var(--display);
  font-size: 20px;
}

.source-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.source-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.source-list li > span {
  display: block;
  color: var(--orange);
  font-family: var(--mono);
  font-size: 8px;
  text-transform: uppercase;
}

.source-list p {
  margin: 3px 0 0;
  font-size: 12px;
}

.link-list a {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--navy);
  font-size: 12px;
  text-decoration: none;
}

.link-list a:hover {
  color: var(--orange);
}

.dialog-note {
  margin: 0;
  padding: 14px 28px 20px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 9px;
}

.toast {
  position: fixed;
  z-index: 200;
  right: 24px;
  bottom: 24px;
  max-width: 330px;
  padding: 13px 17px;
  color: white;
  background: var(--ink);
  border-left: 5px solid var(--yellow);
  box-shadow: 7px 7px 0 rgba(235, 107, 58, 0.45);
  opacity: 0;
  pointer-events: none;
  transform: translateY(14px);
  transition: opacity 180ms ease, transform 180ms ease;
  font-size: 12px;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.empty-state {
  padding: 35px;
  color: var(--ink-soft);
  text-align: center;
  border: 1px dashed var(--line-strong);
}

@media (max-width: 1180px) {
  :root { --rail-width: 210px; }

  .rail { padding-inline: 15px; }
  .nav-item.is-active::before { left: -15px; }
  .brand-copy small { display: none; }
  .hero-grid { grid-template-columns: 1fr; }
  .domain-compass { min-height: 460px; }
  .dashboard-grid { grid-template-columns: 1fr 1fr; }
  .trap-panel { grid-column: 1 / -1; }
  .case-workbench { grid-template-columns: 1fr; }
  .rules-panel { display: grid; grid-template-columns: 220px 1fr; gap: 25px; }
  .rules-panel .eyebrow,
  .rules-panel h2,
  .rules-panel .margin-note { grid-column: 1; }
  .rule-stack { grid-column: 2; grid-row: 1 / span 3; margin: 0; }
}

@media (max-width: 900px) {
  :root { --rail-width: 168px; }

  .rail { align-items: stretch; padding: 19px 14px; }
  .brand { justify-content: center; padding-bottom: 18px; }
  .brand-mark { width: 42px; height: 42px; }
  .brand-copy,
  .rail-progress,
  .source-button { display: none; }
  .rail-nav { width: 100%; }
  .nav-item { display: grid; grid-template-columns: 28px 1fr; align-items: center; padding: 13px 8px; text-align: left; }
  .nav-item.is-active::before { left: -14px; }
  .nav-index { font-size: 11px; }
  .dashboard-grid { grid-template-columns: 1fr; }
  .trap-panel { grid-column: auto; }
  .section-intro { align-items: flex-start; flex-direction: column; }
  .search-box { flex: auto; width: 100%; }
  .learn-layout { grid-template-columns: 1fr; }
  .lesson-index { position: static; }
  #lesson-list { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(210px, 70%); overflow-x: auto; scroll-snap-type: x mandatory; border-top: 0; }
  .lesson-nav-button { scroll-snap-align: start; border: 1px solid var(--line); }
  .lesson-nav-button.is-active { border-left: 4px solid var(--orange); }
  .concept-grid { grid-template-columns: 1fr; }
  .case-intro { align-items: flex-start; }
  .case-facts { width: 100%; }
  .flash-intro { align-items: flex-start; }
  .flash-filters { width: 100%; }
  .exam-setup { grid-template-columns: 1fr; }
  .exam-setup-aside { min-height: 190px; }
  .result-hero { grid-template-columns: 1fr; }
  .result-score { min-height: 180px; }
}

@media (max-width: 660px) {
  :root { --rail-width: 0px; }

  body { padding-bottom: 66px; }
  .paper-noise { opacity: 0.15; }
  .rail {
    inset: auto 0 0 0;
    width: 100%;
    height: 66px;
    display: block;
    padding: 6px 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.16);
    border-right: 0;
  }
  .brand { display: none; }
  .rail-nav { display: grid; grid-template-columns: repeat(5, 1fr); gap: 2px; margin: 0; }
  .nav-item { min-height: 53px; padding: 4px; border-radius: 3px; }
  .nav-item::after { content: attr(data-mobile-label); }
  .nav-item > span:last-child { display: block; font-size: 9px; }
  .nav-item .nav-index { display: none; }
  .nav-item.is-active::before { left: 28%; top: -6px; width: 44%; height: 3px; border-radius: 0 0 3px 3px; }
  main { margin-left: 0; }
  .topbar { min-height: 66px; padding: 12px 17px; }
  .topbar .eyebrow,
  .status-chip { display: none; }
  .breadcrumb { font-size: 15px; }
  .view { min-height: calc(100vh - 66px); padding: 27px 17px 54px; }
  .hero-copy h1 { font-size: clamp(45px, 14vw, 68px); }
  .hero-lead { font-size: 15px; }
  .hero-actions { display: grid; }
  .hero-actions .button { width: 100%; }
  .hero-metrics { grid-template-columns: repeat(3, 1fr); margin-top: 35px; }
  .hero-metrics strong { font-size: 22px; }
  .hero-metrics span { font-size: 7px; }
  .domain-compass { min-height: 465px; padding: 20px; box-shadow: 8px 8px 0 rgba(235, 107, 58, 0.38); }
  .compass-heading { align-items: flex-start; flex-direction: column; gap: 8px; }
  .route-map { height: 335px; margin-top: 12px; }
  .route-line { left: 8%; width: 76%; }
  .route-stop strong { font-size: 14px; }
  .compass-note { left: 20px; right: 20px; bottom: 18px; width: auto; }
  .dashboard-grid { margin-top: 48px; }
  .section-intro { gap: 18px; margin-bottom: 26px; }
  .section-intro h1 { font-size: clamp(43px, 13vw, 62px); }
  .section-intro > div > p:last-child { font-size: 14px; }
  .lesson-sheet { padding: 24px 20px; background: repeating-linear-gradient(0deg, transparent 0 29px, rgba(23, 37, 34, 0.055) 30px), var(--paper-light); }
  .lesson-header h2 { font-size: 38px; }
  .lesson-definition { font-size: 20px; }
  .contrast-block { grid-template-columns: 1fr; }
  .contrast-side + .contrast-side { border-left: 0; border-top: 1px solid var(--ink); }
  .lesson-footer { align-items: stretch; flex-direction: column; }
  .complete-button { width: 100%; }
  .case-facts span { padding-inline: 8px; }
  .case-facts strong { font-size: 21px; }
  .case-map { padding: 17px; }
  .map-heading { align-items: stretch; flex-direction: column; }
  .map-toggle { display: grid; grid-template-columns: 1fr 1fr; }
  .subdomain-map { min-width: 570px; grid-template-columns: 1.2fr 1fr 1fr; padding: 20px; }
  .challenge-options { grid-template-columns: 1fr; }
  .rules-panel { display: block; }
  .rule-stack { margin-top: 22px; }
  .flash-stage { margin-top: 30px; }
  .flashcard { height: 365px; }
  .flash-face { padding: 30px 22px 65px; box-shadow: 7px 7px 0 var(--orange); }
  .flash-face strong { font-size: 29px; }
  .flash-actions { grid-template-columns: 1fr 1fr; }
  .keyboard-hint { display: none; }
  .exam-intro { display: grid; grid-template-columns: 1fr auto; }
  .exam-intro > div { grid-column: 1 / -1; }
  .exam-timer { grid-column: 2; min-width: 105px; padding: 9px 12px; font-size: 21px; }
  .exam-shell { margin-top: 27px; }
  .exam-specs { grid-template-columns: 1fr; }
  .exam-specs div + div { border-left: 0; border-top: 1px solid var(--line); }
  .question-card { padding: 24px 18px; }
  .question-navigation { display: grid; grid-template-columns: 1fr 1fr; }
  .question-navigation .button:last-child { grid-column: 1 / -1; }
  .source-columns { grid-template-columns: 1fr; }
  .source-dialog { box-shadow: 7px 7px 0 rgba(235, 107, 58, 0.55); }
  .toast { right: 14px; bottom: 80px; left: 14px; 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;
  }
}

@media print {
  .rail,
  .topbar,
  .hero-actions,
  .flash-actions,
  .exam-timer,
  .source-dialog,
  .toast {
    display: none !important;
  }

  main { margin: 0; }
  .view { display: block !important; padding: 20px; }
  .panel,
  .lesson-sheet { box-shadow: none; break-inside: avoid; }
}

/* =================================================================
   v2 · lección profunda, repaso en tres modos y correcciones de la
   auditoría (accesibilidad, tipografía móvil, impresión).
   ================================================================= */

/* ---------- estructura de la lección profunda ---------- */

.lesson-sheet {
  max-width: none;
}

.lesson-sheet .lesson-body,
.lesson-section > p,
.lesson-section > ul,
.lesson-section > ol,
.goal-lead,
.checks-lead {
  max-width: 68ch;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 14px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  font-family: var(--body);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.lesson-section:first-of-type .section-title,
.lesson-goal .section-title {
  padding-top: 0;
  border-top: 0;
}

.section-kind::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 2px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--orange);
}

.lesson-section {
  margin-top: 34px;
}

.lesson-section p {
  font-size: 16px;
  line-height: 1.7;
}

.section-note {
  margin-top: 16px;
  padding-left: 12px;
  border-left: 2px solid var(--line-strong);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-soft);
}

.block-title {
  margin: 30px 0 14px;
  font-family: var(--display);
  font-size: 21px;
  font-weight: 600;
}

.lesson-goal {
  margin-top: 30px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--yellow);
  background: rgba(244, 201, 93, 0.14);
}

.goal-lead {
  margin: 0 0 14px;
  font-size: 17px;
  line-height: 1.6;
}

.goal-list {
  margin: 0;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.65;
}

.goal-list li + li {
  margin-top: 6px;
}

.numbered-list {
  margin: 18px 0;
  padding-left: 22px;
  font-size: 16px;
  line-height: 1.7;
}

.numbered-list li + li {
  margin-top: 10px;
}

.code-block {
  overflow-x: auto;
  margin: 18px 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--navy);
  background: var(--paper-light);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}

.code-block code {
  font: inherit;
}

.lesson-section p code,
.lesson-section li code {
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--paper-light);
  font-family: var(--mono);
  font-size: 0.88em;
}

/* ---------- tablas de comparación ---------- */

.compare-table {
  overflow-x: auto;
  margin: 20px 0;
  border: 1px solid var(--line-strong);
  background: var(--paper-light);
  -webkit-overflow-scrolling: touch;
}

.compare-row {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(150px, 1fr);
  gap: 0;
  min-width: 520px;
}

.compare-row > span {
  padding: 12px 14px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.55;
}

.compare-row > span + span {
  border-left: 1px solid var(--line);
}

.compare-head {
  background: var(--navy);
  color: var(--paper-light);
}

.compare-head > span {
  border-top: 0;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.compare-head > span + span {
  border-left-color: rgba(255, 255, 255, 0.24);
}

.compare-row:nth-of-type(even) {
  background: rgba(23, 37, 34, 0.02);
}

/* ---------- fichas de patrones de integración ---------- */

.pattern-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
  gap: 12px;
  margin: 20px 0;
}

.pattern-cards article {
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: var(--paper-light);
}

.pattern-cards h5 {
  margin: 8px 0 6px;
  font-family: var(--display);
  font-size: 18px;
}

.pattern-cards p {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
}

.pattern-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 2px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.pattern-tag.coop { background: rgba(21, 122, 110, 0.16); color: var(--teal); }
.pattern-tag.cs { background: rgba(19, 60, 85, 0.14); color: var(--navy); }
.pattern-tag.sep { background: rgba(201, 76, 61, 0.14); color: var(--red); }

/* ---------- aplicación a los casos ---------- */

.case-apply {
  margin-top: 4px;
  padding: 22px 24px;
  border: 1px solid var(--line-strong);
  background: var(--paper-light);
}

.case-apply h4 {
  margin: 26px 0 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
  font-family: var(--display);
  font-size: 19px;
}

.case-apply h4:first-child {
  margin-top: 0;
}

.case-apply p {
  font-size: 15px;
  line-height: 1.65;
}

.applied-label {
  padding: 10px 14px;
  border-left: 3px solid var(--orange);
  background: rgba(235, 107, 58, 0.08);
  font-size: 14px !important;
}

/* ---------- autoevaluación ---------- */

.lesson-checks {
  padding-bottom: 6px;
}

.badge-passed {
  padding: 2px 9px;
  border-radius: 2px;
  background: var(--teal);
  color: var(--paper-light);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.checks-lead {
  margin: 0 0 18px;
  font-size: 15px;
  color: var(--ink-soft);
}

.check-card {
  margin-bottom: 16px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  background: var(--paper-light);
}

.check-question {
  display: flex;
  gap: 12px;
  margin: 0 0 14px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
}

.check-question span {
  flex: none;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--orange);
}

.check-options {
  display: grid;
  gap: 8px;
}

.check-option {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 10px;
  align-items: start;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: transparent;
  font-size: 15px;
  line-height: 1.5;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.16s ease, background 0.16s ease;
}

.check-option:not(:disabled):hover {
  border-color: var(--navy);
  background: rgba(19, 60, 85, 0.05);
}

.check-option .option-letter {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-soft);
}

.check-option:disabled {
  cursor: default;
  opacity: 0.72;
}

.check-option.is-correct {
  border-color: var(--teal);
  background: rgba(21, 122, 110, 0.12);
  opacity: 1;
}

.check-option.is-wrong {
  border-color: var(--red);
  background: rgba(201, 76, 61, 0.1);
  opacity: 1;
}

.check-why {
  margin: 14px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--navy);
  background: rgba(19, 60, 85, 0.06);
  font-size: 14px;
  line-height: 1.6;
}

/* ---------- índice, paginador y pie ---------- */

.lesson-nav-button.is-started .lesson-check {
  color: var(--orange);
}

.lesson-nav-title {
  min-width: 0;
}

.index-toggle {
  display: none;
  width: 100%;
  margin-bottom: 16px;
  padding: 13px 16px;
  border: 1px solid var(--line-strong);
  background: var(--paper-light);
  font-size: 14px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}

.index-toggle::after {
  content: "▾";
  float: right;
  color: var(--orange);
}

.lesson-pager {
  position: sticky;
  bottom: 0;
  z-index: 4;
  display: none;
  grid-template-columns: 1fr auto 1fr;
  gap: 8px;
  margin-top: 30px;
  padding: 10px 10px calc(10px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line-strong);
  background: var(--paper);
}

.pager-button {
  padding: 12px 10px;
  border: 1px solid var(--line-strong);
  background: var(--paper-light);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.pager-button:disabled {
  cursor: default;
  opacity: 0.4;
}

.pager-center {
  min-width: 132px;
  background: var(--navy);
  color: var(--paper-light);
  border-color: var(--navy);
}

.lesson-footer .lesson-source {
  display: grid;
  gap: 4px;
  max-width: 46ch;
}

.lesson-source > span {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.lesson-source p {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
}

/* ---------- repaso en tres modos ---------- */

.review-modes {
  display: flex;
  flex-wrap: nowrap;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line-strong);
  background: var(--paper-light);
}

.review-modes button {
  padding: 9px 15px;
  white-space: nowrap;
  border: 0;
  background: transparent;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.review-modes button.is-active {
  background: var(--navy);
  color: var(--paper-light);
}

.recap-heading {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 18px;
}

.recap-heading h2 {
  margin: 4px 0 0;
  font-family: var(--display);
  font-size: 26px;
}

.recap-filters {
  display: flex;
  gap: 4px;
}

.recap-filters button {
  padding: 7px 13px;
  border: 1px solid var(--line);
  background: transparent;
  font-size: 12px;
  cursor: pointer;
}

.recap-filters button.is-active {
  border-color: var(--orange);
  background: var(--orange);
  color: var(--paper-light);
}

.recap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 14px;
  margin-bottom: 40px;
}

.recap-card {
  display: flex;
  flex-direction: column;
  padding: 18px 20px;
  border: 1px solid var(--line-strong);
  background: var(--paper-light);
}

.recap-card h3 {
  margin: 6px 0 12px;
  font-family: var(--display);
  font-size: 19px;
  line-height: 1.25;
}

.recap-track {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.recap-card dl {
  flex: 1;
  margin: 0 0 14px;
}

.recap-card dl > div + div {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.recap-card dt {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.recap-card dd {
  margin: 3px 0 0;
  font-size: 14px;
  line-height: 1.55;
}

.recap-trap dd {
  padding-left: 10px;
  border-left: 3px solid var(--orange);
}

/* ---------- mis fallos ---------- */

.weak-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
  margin-bottom: 34px;
}

.weak-card {
  padding: 18px 20px;
  border: 1px solid var(--line-strong);
  border-top: 4px solid var(--red);
  background: var(--paper-light);
}

.weak-card h4 {
  margin: 6px 0 8px;
  font-family: var(--display);
  font-size: 19px;
}

.weak-card p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.55;
}

.weak-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.weak-cards {
  display: grid;
  gap: 10px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.weak-cards li {
  display: grid;
  gap: 4px;
  padding: 13px 16px;
  border: 1px solid var(--line);
  background: var(--paper-light);
}

.weak-cards strong { font-size: 15px; }
.weak-cards span { font-size: 14px; color: var(--ink-soft); }

.empty-state-wide {
  padding: 34px;
  text-align: center;
}

.empty-state-wide .muted {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--ink-soft);
}

/* ---------- varios ---------- */

.pulse-split {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.pulse-split span {
  display: block;
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.pulse-split strong {
  font-family: var(--display);
  font-size: 20px;
}

.svg-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.exam-timer.is-urgent {
  color: #ff9b7b;
}

.topbar-sources { display: none; }

.cml-sample code {
  white-space: pre;
  overflow-wrap: normal;
  word-break: normal;
}

.cml-sample {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* ---------- correcciones responsive ---------- */

@media (max-width: 900px) {
  /* El índice pasa a ser un panel desplegable en lugar de una tira horizontal. */
  .index-toggle { display: block; }
  .lesson-pager { display: grid; }

  .lesson-index {
    display: none;
    position: static;
    margin-bottom: 22px;
    padding: 12px;
    border: 1px solid var(--line-strong);
    background: var(--paper-light);
  }

  .lesson-index.is-open { display: block; }

  #lesson-list {
    display: grid;
    grid-auto-flow: row;
    grid-auto-columns: auto;
    max-height: 52vh;
    overflow-y: auto;
    overflow-x: hidden;
    border-top: 0;
  }

  .lesson-nav-button {
    scroll-snap-align: none;
    border: 0;
    border-bottom: 1px solid var(--line);
  }

  .lesson-nav-button.is-active {
    border-left: 4px solid var(--orange);
  }

  /* El botón de fuentes desaparecía del rail: vuelve en la cabecera. */
  .topbar-sources { display: inline-flex; }

  .review-modes { width: 100%; }
  .review-modes button { flex: 1; }
}

@media (max-width: 660px) {
  /* Tipografía legible para estudio prolongado. */
  .lesson-section p,
  .goal-lead,
  .check-option,
  .check-why,
  .case-apply p,
  .recap-card dd { font-size: 16px; }

  .lesson-section p,
  .case-apply p { line-height: 1.75; }

  .goal-list,
  .numbered-list,
  .lesson-section ul li,
  .weak-card p { font-size: 15px; }

  .section-title { font-size: 11px; }
  .section-note,
  .lesson-source p { font-size: 12px; }

  .lesson-goal { padding: 18px; }
  .case-apply { padding: 18px; }
  .check-card { padding: 15px 16px; }
  .pattern-cards { grid-template-columns: 1fr; }
  .recap-grid { grid-template-columns: 1fr; }
  .weak-grid { grid-template-columns: 1fr; }
  .pulse-split { grid-template-columns: 1fr 1fr 1fr; }

  .lesson-pager {
    /* La barra inferior de navegación mide 66 px: el paginador se apoya encima. */
    bottom: 66px;
    margin-inline: -17px;
    margin-bottom: -54px;
    padding-inline: 14px;
    padding-bottom: 10px;
    box-shadow: 0 -6px 16px rgba(21, 39, 34, 0.1);
  }

  .pager-center { min-width: 0; }
  .recap-heading { align-items: flex-start; flex-direction: column; }
  .recap-filters { width: 100%; }
  .recap-filters button { flex: 1; }
}

@media (max-width: 400px) {
  .review-modes { padding: 3px; }
  .review-modes button { padding: 9px 6px; font-size: 12px; }
  .recap-filters button { padding: 7px 6px; }
  .flash-filters button { padding-inline: 8px; }
}

@media (max-width: 380px) {
  .pager-button { padding: 11px 6px; font-size: 13px; }
  .check-option { grid-template-columns: 22px 1fr; padding: 10px; }
}

/* ---------- impresión ---------- */

@media print {
  .index-toggle,
  .lesson-pager,
  .review-modes,
  .recap-filters,
  .lesson-index,
  .check-options,
  .complete-button {
    display: none !important;
  }

  /* break-inside solo en bloques pequeños: una lección larga debe poder partirse. */
  .panel,
  .lesson-sheet {
    break-inside: auto;
  }

  .lesson-example,
  .exam-trap,
  .check-card,
  .recap-card,
  .concept-tile,
  .pattern-cards article,
  .compare-row {
    break-inside: avoid;
  }

  .lesson-section { break-before: auto; }
  .code-block { overflow: visible; white-space: pre-wrap; }
}

.empty-state p { margin: 0 0 8px; }
.empty-state .muted { font-size: 14px; color: var(--ink-soft); }

/* =================================================================
   Bloques del repaso que quedaron sin estilos: ruta mental,
   contrastes, chuleta CML, patrones, invariantes, respuestas
   modelo y checklist.
   ================================================================= */

.review-route {
  margin: 0 0 16px;
  padding: 26px 30px;
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--navy);
  background: var(--paper-light);
}

.review-route-heading h2 {
  margin: 4px 0 0;
  max-width: 24ch;
  font-family: var(--display);
  font-size: clamp(24px, 2.4vw, 31px);
  font-weight: 600;
  line-height: 1.15;
}

.review-route-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(178px, 1fr));
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.review-route-steps li {
  position: relative;
  padding: 0 18px;
  border-left: 1px solid var(--line);
}

.review-route-steps li:first-child {
  padding-left: 0;
  border-left: 0;
}

.review-route-steps li > span {
  display: block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.review-route-steps li > span::after {
  content: "";
  display: block;
  width: 26px;
  height: 2px;
  margin-top: 8px;
  background: var(--orange);
}

.review-route-steps small {
  display: block;
  margin-bottom: 3px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.review-route-steps strong {
  display: block;
  margin-bottom: 8px;
  font-family: var(--display);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.2;
}

.review-route-steps p {
  margin: 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* ---------- rejilla de tarjetas del repaso ---------- */

.review-grid {
  display: grid;
  margin-top: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  align-items: start;
}

.review-card {
  min-width: 0;
  padding: 24px 26px;
  overflow-wrap: break-word;
  border: 1px solid var(--line-strong);
  background: var(--paper-light);
}

.review-card-wide {
  grid-column: 1 / -1;
}

.review-card-heading {
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.review-card-heading h2 {
  margin: 4px 0 0;
  font-family: var(--display);
  font-size: 23px;
  font-weight: 600;
  line-height: 1.2;
}

.review-card > p {
  font-size: 14px;
  line-height: 1.6;
}

/* ---------- desplegables (contrastes y respuestas modelo) ---------- */

.quick-contrasts,
.model-answer-list {
  display: grid;
  gap: 0;
}

.quick-contrasts details,
.model-answer-list details {
  border-bottom: 1px solid var(--line);
}

.quick-contrasts summary,
.model-answer-list summary {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 12px 0;
  font-size: 15px;
  font-weight: 600;
  list-style: none;
  cursor: pointer;
}

.quick-contrasts summary::-webkit-details-marker,
.model-answer-list summary::-webkit-details-marker {
  display: none;
}

.quick-contrasts summary::before,
.model-answer-list summary::before {
  content: "+";
  flex: none;
  width: 16px;
  font-family: var(--mono);
  font-size: 15px;
  color: var(--orange);
}

.quick-contrasts details[open] > summary::before,
.model-answer-list details[open] > summary::before {
  content: "–";
}

.quick-contrasts summary:hover,
.model-answer-list summary:hover {
  color: var(--navy);
}

.quick-contrasts details > p,
.model-answer-list details > p {
  margin: 0 0 16px 26px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.quick-contrasts details > p strong,
.model-answer-list details > p strong {
  color: var(--ink);
}

/* ---------- chuleta CML ---------- */

.cml-card {
  border-top: 4px solid var(--navy);
}

.cml-sample {
  margin: 0 0 14px;
  padding: 14px 16px;
  border: 1px dashed var(--line-strong);
  background: rgba(19, 60, 85, 0.06);
  text-align: center;
}

.cml-sample code {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--navy);
}

.cml-legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0;
  margin: 16px 0 0;
}

.cml-legend > div {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 8px;
  align-items: baseline;
  padding: 7px 0;
  border-top: 1px solid var(--line);
}

.cml-legend dt {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--orange);
}

.cml-legend dd {
  margin: 0;
  font-size: 13px;
  line-height: 1.4;
}

/* ---------- patrones: la pregunta que decide ---------- */

.pattern-cues {
  margin: 0;
  padding: 0;
  list-style: none;
}

.pattern-cues li {
  padding: 10px 0 10px 16px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  line-height: 1.55;
}

.pattern-cues li + li {
  border-top: 1px solid var(--line);
}

.pattern-cues li:hover {
  border-left-color: var(--orange);
}

.pattern-cues strong {
  color: var(--navy);
}

/* ---------- invariantes ---------- */

.invariant-card {
  border-top: 4px solid var(--orange);
}

.invariant-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
  gap: 1px;
  margin-top: 18px;
  background: var(--line);
}

.invariant-grid > div {
  padding: 15px 16px;
  background: var(--paper-light);
}

.invariant-grid small {
  display: block;
  margin-bottom: 6px;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--orange);
}

.invariant-grid p {
  margin: 0;
  font-size: 13px;
  line-height: 1.55;
}

/* ---------- checklist final ---------- */

.checklist-card {
  border-top: 4px solid var(--teal);
}

.exam-checklist {
  margin: 0;
  padding: 0;
  list-style: none;
}

.exam-checklist li {
  position: relative;
  padding: 9px 0 9px 28px;
  font-size: 14px;
  line-height: 1.55;
}

.exam-checklist li + li {
  border-top: 1px solid var(--line);
}

.exam-checklist li::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 0;
  width: 14px;
  height: 14px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
}

.review-card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

/* ---------- responsive de estos bloques ---------- */

@media (max-width: 1180px) {
  .review-route-steps { grid-template-columns: repeat(2, 1fr); row-gap: 24px; }
  .review-route-steps li:nth-child(odd) { padding-left: 0; border-left: 0; }
}

@media (max-width: 900px) {
  .review-grid { grid-template-columns: minmax(0, 1fr); }
  .review-card-wide { grid-column: auto; }
}

@media (max-width: 660px) {
  .review-route { padding: 20px; }
  .review-route-steps { grid-template-columns: 1fr; row-gap: 22px; }
  .review-route-steps li { padding-left: 0; border-left: 0; }
  .review-card { padding: 20px; }
  .review-card-heading h2 { font-size: 21px; }
  .quick-contrasts summary,
  .model-answer-list summary { font-size: 16px; }
  .quick-contrasts details > p,
  .model-answer-list details > p,
  .pattern-cues li,
  .exam-checklist li,
  .invariant-grid p { font-size: 15px; }
  .cml-legend { grid-template-columns: 1fr; }
  .invariant-grid { grid-template-columns: 1fr; }
}

@media print {
  .review-card,
  .review-route,
  .invariant-grid > div { break-inside: avoid; }
}