.ka-engine {
  background:
    radial-gradient(circle at 18% 8%, rgba(14, 99, 199, .32), transparent 30%),
    linear-gradient(145deg, #061a35 0%, #071b3a 56%, #0b4ea2 120%);
  border-radius: 22px;
  color: #fff;
  display: grid;
  gap: 18px;
  min-height: 72vh;
  overflow: hidden;
  padding: 22px;
}

.ka-hero {
  align-items: flex-start;
  display: flex;
  gap: 20px;
  justify-content: space-between;
}

.ka-hero h3 {
  font-size: clamp(24px, 3vw, 40px);
  margin: 8px 0;
}

.ka-hero span,
.ka-hero p {
  color: rgba(255, 255, 255, .72);
}

.ka-hero-stats {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(4, minmax(92px, 1fr));
}

.ka-hero-stats article,
.ka-panel,
.ka-node {
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 16px;
}

.ka-hero-stats article {
  padding: 12px;
}

.ka-hero-stats strong {
  color: #e6c46a;
  display: block;
  font-size: 22px;
  margin-top: 4px;
}

.ka-map {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(138px, 1fr));
}

.ka-node {
  color: #fff;
  min-height: 112px;
  padding: 14px;
  text-align: left;
}

.ka-node strong {
  align-items: center;
  background: rgba(255, 255, 255, .12);
  border-radius: 50%;
  display: inline-flex;
  height: 34px;
  justify-content: center;
  margin-bottom: 10px;
  width: 34px;
}

.ka-node span,
.ka-node small {
  display: block;
}

.ka-node small {
  color: rgba(255, 255, 255, .62);
  margin-top: 4px;
}

.ka-node.current {
  border-color: #e6c46a;
  box-shadow: 0 0 0 2px rgba(230, 196, 106, .2), 0 18px 38px rgba(0, 0, 0, .22);
}

.ka-node.passed {
  background: rgba(32, 167, 131, .22);
  border-color: rgba(32, 167, 131, .7);
}

.ka-node.failed {
  background: rgba(216, 77, 77, .18);
  border-color: rgba(216, 77, 77, .55);
}

.ka-node.locked {
  filter: grayscale(.6);
  opacity: .56;
}

.ka-panel {
  padding: 22px;
}

.ka-level-intro h3,
.ka-submit-confirm h3 {
  font-size: 30px;
  margin: 10px 0;
}

.ka-level-meta {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 18px 0;
}

.ka-level-meta article {
  background: rgba(255, 255, 255, .08);
  border-radius: 14px;
  padding: 14px;
}

.ka-level-meta strong {
  color: #e6c46a;
  display: block;
  font-size: 26px;
}

.ka-question-head {
  align-items: flex-start;
  display: flex;
  gap: 16px;
  justify-content: space-between;
}

.ka-question h3 {
  font-size: 24px;
  line-height: 1.45;
  margin: 8px 0 0;
}

.ka-combo {
  background: rgba(255, 255, 255, .1);
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 999px;
  color: rgba(255, 255, 255, .72);
  font-weight: 800;
  padding: 8px 14px;
}

.ka-combo.hot {
  background: rgba(230, 196, 106, .22);
  border-color: #e6c46a;
  color: #e6c46a;
}

.ka-options {
  display: grid;
  gap: 12px;
  margin: 20px 0;
}

.ka-option {
  align-items: center;
  background: rgba(255, 255, 255, .1);
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 16px;
  color: #fff;
  cursor: pointer;
  display: grid;
  gap: 12px;
  grid-template-columns: 48px 1fr;
  padding: 16px;
  text-align: left;
}

.ka-option strong {
  align-items: center;
  background: rgba(255, 255, 255, .12);
  border-radius: 12px;
  display: inline-flex;
  height: 42px;
  justify-content: center;
}

.ka-option:hover,
.ka-option.selected {
  border-color: #e6c46a;
  transform: translateY(-2px);
}

.ka-option.right {
  background: rgba(32, 167, 131, .22);
  border-color: rgba(32, 167, 131, .76);
}

.ka-option.wrong {
  background: rgba(216, 77, 77, .2);
  border-color: rgba(216, 77, 77, .72);
}

.ka-feedback {
  border-radius: 14px;
  margin-bottom: 18px;
  padding: 12px 14px;
}

.ka-feedback.right {
  background: rgba(32, 167, 131, .2);
  border: 1px solid rgba(32, 167, 131, .68);
}

.ka-feedback.wrong {
  background: rgba(216, 77, 77, .18);
  border: 1px solid rgba(216, 77, 77, .62);
}

.ka-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: flex-end;
}

.ka-primary,
.ka-secondary {
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 800;
  padding: 12px 18px;
}

.ka-primary {
  background: linear-gradient(135deg, #e6c46a, #d8b76a);
  color: #061a35;
}

.ka-primary:disabled {
  cursor: not-allowed;
  filter: grayscale(.7);
  opacity: .5;
}

.ka-secondary {
  background: rgba(255, 255, 255, .1);
  color: #fff;
}

.ka-level-result,
.ka-final,
.ka-submit-confirm {
  text-align: center;
}

.ka-level-result h3,
.ka-final h3 {
  color: #e6c46a;
  font-size: clamp(34px, 6vw, 72px);
  margin: 10px 0;
}

.ka-rank {
  background: rgba(230, 196, 106, .2);
  border: 1px solid rgba(230, 196, 106, .55);
  border-radius: 999px;
  color: #e6c46a;
  display: inline-flex;
  font-size: 22px;
  font-weight: 900;
  margin: 12px auto;
  padding: 10px 22px;
}

.ka-level-results {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  margin: 18px 0;
}

.ka-level-results article {
  background: rgba(255, 255, 255, .08);
  border-radius: 14px;
  padding: 12px;
}

.ka-level-results article.passed {
  border: 1px solid rgba(32, 167, 131, .7);
}

.ka-level-results article.failed {
  border: 1px solid rgba(216, 77, 77, .62);
}

.ka-credit-note {
  color: rgba(255, 255, 255, .72);
}

@media (max-width: 760px) {
  .ka-engine {
    border-radius: 16px;
    min-height: 78vh;
    padding: 14px;
  }

  .ka-hero,
  .ka-question-head {
    flex-direction: column;
  }

  .ka-hero-stats,
  .ka-level-meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: 100%;
  }

  .ka-map {
    display: flex;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .ka-node {
    flex: 0 0 156px;
  }

  .ka-panel {
    padding: 16px;
  }

  .ka-option {
    min-height: 58px;
  }

  .ka-actions.sticky {
    background: linear-gradient(180deg, rgba(7, 27, 58, 0), #071b3a 22%);
    bottom: 0;
    margin: 0 -16px -16px;
    padding: 16px;
    position: sticky;
  }

  .ka-primary,
  .ka-secondary {
    flex: 1;
  }
}