:root {
  --cbt-night: #041723;
  --cbt-panel: #082838;
  --cbt-cyan: #5de5ff;
  --cbt-green: #68e6aa;
  --cbt-amber: #ffc85a;
  --cbt-red: #ff7b75;
}

.cbt-main {
  overflow: hidden;
}

.cbt-hero {
  position: relative;
  min-height: 760px;
  padding: 150px 0 86px;
  color: #fff;
  background:
    linear-gradient(120deg, rgba(3, 24, 39, .97), rgba(5, 53, 78, .91)),
    radial-gradient(circle at 75% 30%, rgba(93, 229, 255, .24), transparent 34rem);
}

.cbt-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .16;
  background-image:
    linear-gradient(rgba(255,255,255,.2) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.2) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(90deg, #000, transparent 76%);
  pointer-events: none;
}

.cbt-hero__layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(380px, .95fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 7rem);
}

.cbt-kicker {
  margin: 0 0 1rem;
  color: var(--cbt-cyan);
  font: 800 .76rem/1.2 var(--mono);
  letter-spacing: .13em;
  text-transform: uppercase;
}

.cbt-hero h1 {
  max-width: 760px;
  margin: 0;
  font: 900 clamp(4rem, 8vw, 7.2rem)/.78 var(--display);
  letter-spacing: -.055em;
}

.cbt-hero h1 span {
  color: var(--cbt-cyan);
}

.cbt-hero__lead {
  max-width: 690px;
  margin: 2.1rem 0 0;
  color: rgba(235, 250, 255, .84);
  font-size: clamp(1rem, 1.3vw, 1.16rem);
  line-height: 1.75;
}

.cbt-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin-top: 2rem;
}

.cbt-hero .btn--ghost {
  color: #fff;
  border-color: rgba(255,255,255,.3);
}

.cbt-resume-note {
  margin: 1rem 0 0;
  color: rgba(255,255,255,.58);
  font-size: .82rem;
}

.cbt-display-stack {
  position: relative;
  min-height: 490px;
  perspective: 1200px;
}

.cbt-display {
  overflow: hidden;
  border: 1px solid rgba(93, 229, 255, .48);
  border-radius: 15px;
  background: #020c12;
  box-shadow: 0 40px 100px rgba(0,0,0,.45), inset 0 0 38px rgba(93, 229, 255, .07);
}

.cbt-display--pfd {
  position: absolute;
  inset: 0 4% 10% 0;
  transform: rotateY(-7deg) rotateX(2deg);
}

.pfd-sky,
.pfd-ground {
  position: absolute;
  inset-inline: 0;
  height: 50%;
}

.pfd-sky {
  top: 0;
  background: linear-gradient(#1459b0, #188bd2);
}

.pfd-ground {
  bottom: 0;
  background: linear-gradient(#9d5228, #68321d);
}

.pfd-horizon {
  position: absolute;
  top: calc(50% - 2px);
  left: 12%;
  width: 76%;
  height: 4px;
  background: #fff;
  box-shadow: 0 0 14px rgba(255,255,255,.7);
}

.pfd-fma {
  position: absolute;
  inset: 0 0 auto;
  padding: .7rem;
  color: #72ffa9;
  border-bottom: 2px solid #fff;
  background: rgba(0,0,0,.78);
  font: 700 .82rem var(--mono);
  text-align: center;
  letter-spacing: .06em;
}

.pfd-speed,
.pfd-alt {
  position: absolute;
  top: 25%;
  bottom: 14%;
  display: flex;
  width: 76px;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
  color: #fff;
  background: rgba(0,0,0,.75);
  font: 700 .72rem var(--mono);
}

.pfd-speed { left: 4%; }
.pfd-alt { right: 4%; width: 92px; }
.pfd-speed b,
.pfd-alt b {
  width: calc(100% + 12px);
  padding: .48rem .25rem;
  border: 2px solid #fff;
  color: var(--cbt-cyan);
  background: #031019;
  font-size: 1rem;
  text-align: center;
}

.pfd-wings {
  position: absolute;
  top: calc(50% - 1rem);
  left: 50%;
  color: #fff;
  font: 900 1.3rem var(--mono);
  transform: translateX(-50%);
}

.cbt-display--status {
  position: absolute;
  right: -4%;
  bottom: 0;
  z-index: 2;
  width: 280px;
  padding: 1.1rem 1.2rem 1rem;
  color: rgba(255,255,255,.75);
  background: rgba(2, 12, 18, .97);
  font: 700 .7rem var(--mono);
  letter-spacing: .08em;
}

.cbt-display--status strong {
  display: block;
  margin: .45rem 0;
  color: var(--cbt-green);
  font-size: 2.1rem;
}

.cbt-display--status small {
  display: block;
  margin-top: .65rem;
  color: rgba(255,255,255,.62);
  font: 600 .66rem var(--body);
  letter-spacing: 0;
}

.cbt-display__bar {
  height: 6px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255,255,255,.14);
}

.cbt-display__bar i {
  display: block;
  width: 0;
  height: 100%;
  background: var(--cbt-green);
  transition: width .4s ease;
}

.cbt-safety {
  padding: 1rem 0;
  color: #d9ecf3;
  background: #062638;
}

.cbt-safety .wrap {
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.cbt-safety strong {
  flex: 0 0 auto;
  color: var(--cbt-amber);
  font: 800 .78rem var(--mono);
  text-transform: uppercase;
}

.cbt-safety p {
  margin: 0;
  font-size: .77rem;
  line-height: 1.55;
}

.cbt-outline,
.cbt-course,
.cbt-sources {
  padding: 90px 0;
}

.cbt-section-heading {
  max-width: 760px;
  margin-bottom: 2.3rem;
}

.cbt-section-heading > p {
  margin: 0 0 .7rem;
  color: var(--brand-secondary);
  font: 800 .75rem var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
}

.cbt-section-heading h2,
.cbt-course__top h2,
.cbt-sources h2 {
  margin: 0;
  color: var(--brand-primary);
  font: 900 clamp(2.7rem, 6vw, 4.7rem)/.9 var(--display);
  letter-spacing: -.04em;
}

.cbt-section-heading span {
  display: block;
  margin-top: 1rem;
  color: var(--muted);
  line-height: 1.65;
}

.cbt-outline-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .8rem;
}

.cbt-outline-card {
  min-height: 190px;
  padding: 1.35rem;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255,255,255,.78);
  box-shadow: var(--shadow-soft);
}

.cbt-outline-card span {
  color: var(--brand-secondary);
  font: 800 .7rem var(--mono);
}

.cbt-outline-card h3 {
  margin: .8rem 0 .55rem;
  color: var(--brand-primary);
  font: 800 1.45rem/1 var(--display);
}

.cbt-outline-card p {
  margin: 0;
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.55;
}

.cbt-course {
  background: linear-gradient(180deg, rgba(2, 17, 26, .98), rgba(4, 35, 49, .99));
}

.cbt-course__top {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 1.5rem;
  color: #fff;
}

.cbt-course__top h2 {
  color: #fff;
}

.cbt-progress {
  width: min(300px, 100%);
  color: rgba(255,255,255,.7);
  font: 700 .72rem var(--mono);
}

.cbt-progress__track {
  height: 8px;
  margin-top: .55rem;
  overflow: hidden;
  border-radius: 99px;
  background: rgba(255,255,255,.12);
}

.cbt-progress__track i {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cbt-cyan), var(--cbt-green));
  transition: width .4s ease;
}

.cbt-app {
  display: grid;
  grid-template-columns: 285px minmax(0, 1fr);
  width: 100%;
  min-width: 0;
  min-height: 780px;
  overflow: hidden;
  border: 1px solid rgba(93, 229, 255, .2);
  border-radius: 26px;
  background: #f7fbfd;
  box-shadow: 0 50px 120px rgba(0,0,0,.36);
}

.cbt-sidebar {
  width: 100%;
  min-width: 0;
  max-width: 100%;
  padding: 1rem;
  color: #fff;
  background: #061d2a;
}

.cbt-sidebar__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .55rem .5rem 1rem;
  color: var(--cbt-cyan);
  font: 800 .7rem var(--mono);
  letter-spacing: .1em;
}

.cbt-reset {
  padding: .25rem .4rem;
  border: 0;
  color: rgba(255,255,255,.48);
  background: transparent;
  font: 700 .62rem var(--body);
  cursor: pointer;
}

.cbt-reset:hover {
  color: #fff;
}

.cbt-module-nav {
  display: grid;
  gap: .45rem;
  width: 100%;
  min-width: 0;
  max-width: 100%;
}

.cbt-module-button {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 20px;
  align-items: center;
  gap: .65rem;
  width: 100%;
  padding: .8rem;
  border: 1px solid transparent;
  border-radius: 13px;
  color: rgba(255,255,255,.62);
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: .2s ease;
}

.cbt-module-button:hover {
  color: #fff;
  background: rgba(255,255,255,.06);
}

.cbt-module-button.is-active {
  border-color: rgba(93,229,255,.32);
  color: #fff;
  background: rgba(93,229,255,.1);
}

.cbt-module-button.is-complete .cbt-module-button__status {
  color: var(--cbt-green);
}

.cbt-module-button__number {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 9px;
  font: 800 .68rem var(--mono);
}

.cbt-module-button__text b,
.cbt-module-button__text small {
  display: block;
}

.cbt-module-button__text {
  min-width: 0;
}

.cbt-module-button__text b {
  font: 800 .8rem/1.2 var(--body);
}

.cbt-module-button__text small {
  margin-top: .25rem;
  color: rgba(255,255,255,.38);
  font-size: .62rem;
}

.cbt-module-button__status {
  font: 900 .8rem var(--mono);
  text-align: center;
}

.cbt-lesson {
  width: 100%;
  min-width: 0;
  max-width: 100%;
  padding: clamp(1.5rem, 4vw, 3.5rem);
  color: var(--ink);
  overflow-wrap: anywhere;
}

.cbt-lesson img,
.cbt-lesson video,
.cbt-lesson canvas,
.cbt-lesson svg {
  display: block;
  max-width: 100%;
  height: auto;
}

.cbt-lesson iframe {
  display: block;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
}

.cbt-lesson__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: start;
  padding-bottom: 1.6rem;
  border-bottom: 1px solid var(--line);
}

.cbt-lesson__head span {
  color: var(--brand-secondary);
  font: 800 .7rem var(--mono);
  letter-spacing: .1em;
}

.cbt-lesson__head h2 {
  margin: .55rem 0 .65rem;
  color: var(--brand-primary);
  font: 900 clamp(2.3rem, 5vw, 4rem)/.9 var(--display);
  letter-spacing: -.035em;
}

.cbt-lesson__head p {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.cbt-duration {
  padding: .45rem .65rem;
  border-radius: 999px;
  color: var(--brand-primary);
  background: rgba(12,138,191,.1);
  font: 800 .66rem var(--mono);
  white-space: nowrap;
}

.cbt-content-block {
  margin: 1.6rem 0;
}

.cbt-content-block h3 {
  margin: 0 0 .65rem;
  color: var(--brand-primary);
  font: 800 1.65rem/1 var(--display);
}

.cbt-content-block p,
.cbt-content-block li {
  color: #425d70;
  font-size: .9rem;
  line-height: 1.7;
}

.cbt-content-block ul,
.cbt-content-block ol {
  margin: .8rem 0 0;
  padding-left: 1.25rem;
}

.cbt-content-block li + li {
  margin-top: .45rem;
}

.cbt-callout {
  margin: 1.4rem 0;
  padding: 1rem 1.15rem;
  border-left: 4px solid var(--brand-secondary);
  border-radius: 0 12px 12px 0;
  color: #29495e;
  background: #e8f6fb;
  font-size: .84rem;
  line-height: 1.6;
}

.cbt-callout strong {
  color: var(--brand-primary);
}

.cbt-callout--warning {
  border-color: #dc9e25;
  background: #fff6df;
}

.cbt-callout--critical {
  border-color: #d8544f;
  background: #fff0ef;
}

.cbt-reference {
  width: min(820px, 100%);
  min-width: 0;
  margin: 1.5rem 0;
  overflow: hidden;
  border: 1px solid #c9dce6;
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 12px 28px rgba(7, 55, 83, .1);
}

.cbt-reference--portrait {
  width: min(520px, 100%);
}

.cbt-reference--wide {
  width: 100%;
}

.cbt-reference__image {
  display: block;
  overflow: hidden;
  border-bottom: 1px solid #d7e5ec;
  background: #e8f1f5;
  cursor: zoom-in;
}

.cbt-reference__image img {
  width: 100%;
  height: auto;
  transition: transform .25s ease;
}

.cbt-reference__image:hover img {
  transform: scale(1.012);
}

.cbt-reference figcaption {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: .75rem 1rem;
  align-items: start;
  padding: .9rem 1rem;
  color: #425d70;
  font-size: .72rem;
  line-height: 1.5;
}

.cbt-reference figcaption a {
  color: var(--brand-secondary);
  font-weight: 800;
  text-align: right;
  text-decoration: none;
}

.cbt-reference figcaption a:hover {
  color: var(--brand-primary);
  text-decoration: underline;
}

.cbt-system-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .7rem;
  margin: 1rem 0;
}

.cbt-system-card {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}

.cbt-system-card b {
  display: block;
  margin-bottom: .4rem;
  color: var(--brand-primary);
  font: 800 1rem var(--display);
}

.cbt-system-card span {
  color: var(--muted);
  font-size: .75rem;
  line-height: 1.5;
}

.cbt-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: .4rem;
  margin: 1rem 0 1.4rem;
}

.cbt-flow div {
  position: relative;
  padding: .8rem .5rem;
  border: 1px solid rgba(12,138,191,.2);
  border-radius: 10px;
  color: var(--brand-primary);
  background: #eaf8fd;
  font: 800 .68rem/1.3 var(--mono);
  text-align: center;
}

.cbt-flow div:not(:last-child)::after {
  content: "›";
  position: absolute;
  top: 50%;
  right: -.43rem;
  z-index: 2;
  color: var(--brand-secondary);
  font-size: 1.25rem;
  transform: translateY(-50%);
}

.cbt-interactive {
  margin: 1.5rem 0;
  padding: 1.2rem;
  border: 1px solid rgba(12,138,191,.2);
  border-radius: 18px;
  background: linear-gradient(145deg, #eefaff, #fff);
}

.cbt-interactive__head {
  margin-bottom: 1rem;
}

.cbt-interactive__head span {
  color: var(--brand-secondary);
  font: 800 .66rem var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
}

.cbt-interactive__head h3 {
  margin: .4rem 0 .2rem;
  color: var(--brand-primary);
  font: 800 1.45rem var(--display);
}

.cbt-interactive__head p {
  margin: 0;
  color: var(--muted);
  font-size: .75rem;
  line-height: 1.5;
}

.cbt-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
}

.cbt-control {
  display: grid;
  gap: .35rem;
}

.cbt-control span {
  color: #496477;
  font-size: .7rem;
  font-weight: 800;
}

.cbt-control input,
.cbt-control select {
  width: 100%;
  padding: .65rem .7rem;
  border: 1px solid rgba(6,54,95,.17);
  border-radius: 9px;
  color: var(--ink);
  background: #fff;
}

.cbt-control--check {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding-top: 1.2rem;
}

.cbt-control--check input {
  width: auto;
}

.cbt-calc-result {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 12px;
  color: #fff;
  background: #062638;
}

.cbt-calc-result strong {
  color: var(--cbt-green);
  font: 800 2rem var(--mono);
}

.cbt-calc-result span {
  font-size: .72rem;
  line-height: 1.45;
}

.cbt-calc-result small {
  grid-column: 1 / -1;
  color: #b9d2df;
  font-size: .68rem;
  line-height: 1.5;
}

.cbt-scenario-options {
  display: grid;
  gap: .55rem;
  margin-top: .8rem;
}

.cbt-scenario-options button {
  padding: .8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 11px;
  color: #29495e;
  background: #fff;
  text-align: left;
  cursor: pointer;
}

.cbt-scenario-options button:hover {
  border-color: var(--brand-secondary);
}

.cbt-scenario-options button.is-correct {
  border-color: #27946c;
  color: #075f43;
  background: #e4f8ef;
}

.cbt-scenario-options button.is-wrong {
  border-color: #d8544f;
  color: #8f2f2b;
  background: #fff0ef;
}

.cbt-scenario-feedback {
  min-height: 1.3rem;
  margin: .7rem 0 0;
  color: var(--muted);
  font-size: .76rem;
  line-height: 1.5;
}

.cbt-quiz {
  margin-top: 2rem;
  padding-top: 1.8rem;
  border-top: 1px solid var(--line);
}

.cbt-quiz h3 {
  margin: 0;
  color: var(--brand-primary);
  font: 800 1.8rem var(--display);
}

.cbt-question {
  margin-top: 1rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}

.cbt-question.is-correct {
  border-color: #63b797;
}

.cbt-question.is-wrong {
  border-color: #df7b76;
}

.cbt-question legend {
  padding: 0 .25rem;
  color: #27475c;
  font-size: .82rem;
  font-weight: 800;
  line-height: 1.5;
}

.cbt-answer {
  display: flex;
  align-items: flex-start;
  gap: .55rem;
  margin-top: .55rem;
  padding: .6rem .7rem;
  border-radius: 9px;
  color: #496477;
  font-size: .78rem;
  cursor: pointer;
}

.cbt-answer:hover {
  background: #edf7fa;
}

.cbt-answer input {
  margin-top: .1rem;
}

.cbt-answer-explanation {
  margin: .8rem 0 0;
  padding: .7rem .8rem;
  border-radius: 9px;
  color: #7b2d29;
  background: #fff0ef;
  font-size: .76rem;
  font-weight: 700;
  line-height: 1.5;
}

.cbt-quiz-actions,
.cbt-lesson-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1rem;
}

.cbt-action {
  padding: .75rem 1rem;
  border: 0;
  border-radius: 10px;
  color: #fff;
  background: var(--brand-primary);
  font-weight: 800;
  cursor: pointer;
}

.cbt-action:hover {
  background: var(--brand-secondary);
}

.cbt-action--ghost {
  color: var(--brand-primary);
  border: 1px solid var(--line);
  background: #fff;
}

.cbt-action[disabled] {
  opacity: .45;
  cursor: not-allowed;
}

.cbt-quiz-result {
  min-height: 1.4rem;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 700;
}

.cbt-quiz-result.is-pass { color: #08775b; }
.cbt-quiz-result.is-fail { color: #bd413b; }

.cbt-exam-intro {
  padding: 1rem 1.1rem;
  border-radius: 13px;
  color: #dceff5;
  background: #062638;
  line-height: 1.6;
}

.cbt-certificate {
  position: relative;
  overflow: hidden;
  margin-top: 1.5rem;
  padding: 3rem;
  border: 10px solid #062f4f;
  outline: 2px solid var(--brand-gold);
  outline-offset: -18px;
  color: var(--brand-primary);
  background: #fff;
  text-align: center;
}

.cbt-certificate::before {
  content: "CXV";
  position: absolute;
  right: -1rem;
  bottom: -3rem;
  color: rgba(12,138,191,.055);
  font: 900 12rem var(--display);
}

.cbt-certificate p {
  margin: 0;
  color: var(--muted);
}

.cbt-certificate h3 {
  margin: .7rem 0 .2rem;
  font: 900 3.3rem/1 var(--display);
}

.cbt-certificate strong {
  display: block;
  margin: 1rem 0;
  color: var(--brand-secondary);
  font: 800 1.1rem var(--mono);
}

.cbt-certificate input {
  position: relative;
  z-index: 1;
  width: min(420px, 100%);
  margin: 1.3rem auto .5rem;
  padding: .7rem;
  border: 0;
  border-bottom: 2px solid var(--brand-primary);
  color: var(--brand-primary);
  background: transparent;
  font: 800 1.2rem var(--display);
  text-align: center;
}

.cbt-sources {
  background: #e9f6fa;
}

.cbt-sources p {
  max-width: 820px;
  color: var(--muted);
  line-height: 1.65;
}

.cbt-source-links {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: 1.3rem;
}

.cbt-source-links a {
  padding: .7rem .85rem;
  border: 1px solid rgba(12,138,191,.2);
  border-radius: 999px;
  color: var(--brand-primary);
  background: #fff;
  font-size: .73rem;
  font-weight: 800;
}

.cbt-source-links a:hover {
  color: #fff;
  background: var(--brand-primary);
}

@media (max-width: 980px) {
  .cbt-hero {
    min-height: auto;
  }
  .cbt-hero__layout {
    grid-template-columns: 1fr;
  }
  .cbt-display-stack {
    width: min(620px, 100%);
    min-height: 390px;
  }
  .cbt-outline-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .cbt-app {
    grid-template-columns: minmax(0, 1fr);
  }
  .cbt-sidebar {
    overflow: hidden;
    padding-bottom: .7rem;
  }
  .cbt-module-nav {
    display: flex;
    width: 100%;
    min-width: 0;
    max-width: 100%;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    padding-bottom: .25rem;
    scrollbar-width: thin;
  }
  .cbt-module-button {
    flex: 0 0 220px;
  }
}

@media (max-width: 700px) {
  .cbt-hero {
    padding: 125px 0 60px;
  }
  .cbt-hero h1 {
    font-size: clamp(3.6rem, 18vw, 5.5rem);
  }
  .cbt-display-stack {
    min-height: 300px;
  }
  .cbt-display--status {
    right: 0;
    width: 230px;
  }
  .cbt-safety .wrap,
  .cbt-course__top {
    align-items: flex-start;
    flex-direction: column;
  }
  .cbt-outline,
  .cbt-course,
  .cbt-sources {
    padding: 64px 0;
  }
  .cbt-outline-grid,
  .cbt-system-grid,
  .cbt-controls {
    grid-template-columns: 1fr;
  }
  .cbt-flow {
    grid-template-columns: 1fr;
  }
  .cbt-flow div:not(:last-child)::after {
    top: auto;
    right: 50%;
    bottom: -.9rem;
    transform: translateX(50%) rotate(90deg);
  }
  .cbt-lesson {
    padding: 1.25rem;
  }
  .cbt-lesson__head {
    grid-template-columns: 1fr;
  }
  .cbt-reference figcaption {
    grid-template-columns: 1fr;
  }
  .cbt-reference figcaption a {
    text-align: left;
  }
  .cbt-lesson-actions,
  .cbt-quiz-actions {
    align-items: stretch;
    flex-direction: column;
  }
  .cbt-calc-result {
    grid-template-columns: 1fr;
  }
  .cbt-calc-result small {
    grid-column: auto;
  }
  .cbt-certificate {
    padding: 2.3rem 1.2rem;
  }
}

@media print {
  body * { visibility: hidden; }
  .cbt-certificate,
  .cbt-certificate * { visibility: visible; }
  .cbt-certificate {
    position: fixed;
    inset: 1in;
    margin: 0;
  }
}