.kn-lab-shell {
  --kn-bg-page: #f4f2ee;
  --kn-bg-shell: #101216;
  --kn-bg-panel: #1a1e25;
  --kn-bg-panel-soft: #222833;
  --kn-bg-canvas: #e7e4dc;
  --kn-text-main: #f7f3ea;
  --kn-text-muted: #c8c0b2;
  --kn-text-dark: #171717;
  --kn-accent: #e5bf5f;
  --kn-accent-hover: #f0cc70;
  --kn-accent-soft: rgba(229, 191, 95, 0.18);
  --kn-border: rgba(255,255,255,0.12);
  --kn-border-strong: rgba(229,191,95,0.35);
  --kn-radius-lg: 22px;
  --kn-radius-md: 14px;
  --kn-radius-sm: 9px;
  --kn-shadow-soft: 0 18px 50px rgba(0,0,0,0.18);
  --kn-shadow-panel: 0 10px 28px rgba(0,0,0,0.22);
  box-sizing: border-box;
  width: min(100%, 1380px);
  max-width: 1380px;
  margin: 1.5rem auto 3rem;
  padding: 1.25rem;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--kn-radius-lg);
  background: var(--kn-bg-shell);
  color: var(--kn-text-main);
  box-shadow: var(--kn-shadow-soft);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.kn-lab-banner {
  width: 100%;
  aspect-ratio: 4 / 1;
  max-height: 260px;
  min-height: 150px;
  overflow: hidden;
  border-radius: var(--kn-radius-lg);
  background: var(--kn-bg-shell);
  box-shadow: var(--kn-shadow-soft);
  margin-bottom: 1.25rem;
}

.kn-lab-banner img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

.kn-lab-header {
  border: 1px solid var(--kn-border);
  border-radius: var(--kn-radius-md);
  background: linear-gradient(135deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
}

.kn-lab-title {
  color: var(--kn-text-main);
  letter-spacing: 0;
}

.kn-lab-subtitle,
.kn-lab-status,
.kn-lab-footer__kicker,
.kn-lab-footer__tools {
  color: var(--kn-text-muted);
}

.kn-lab-shell input[type="range"] {
  accent-color: var(--kn-accent);
}

.kn-lab-footer {
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--kn-border);
  border-radius: var(--kn-radius-md);
  background: rgba(255,255,255,0.035);
}

.kn-lab-footer__brand {
  display: grid;
  gap: 0.1rem;
}

.kn-lab-footer__brand strong {
  color: var(--kn-text-main);
  font-size: 0.95rem;
}

.kn-lab-footer__kicker,
.kn-lab-footer__tools {
  font-size: 0.78rem;
}

.kn-lab-shell .kn-lab-instructions {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--kn-border);
  border-radius: var(--kn-radius-md);
  background: var(--kn-bg-panel);
  color: #d7d1c5;
  box-shadow: var(--kn-shadow-panel);
  font-size: 0.82rem;
  line-height: 1.45;
}

.kn-lab-shell .kn-lab-instructions summary {
  cursor: pointer;
  color: #f7f3ea;
  font-weight: 700;
}

.kn-lab-shell .kn-lab-instructions summary::marker {
  color: var(--kn-accent);
}

.kn-lab-shell .kn-lab-instructions ol {
  margin: 0.8rem 0 0;
  padding-left: 1.35rem;
}

.kn-lab-shell .kn-lab-instructions li {
  color: #d7d1c5;
  font-size: 0.82rem;
  line-height: 1.45;
}

.kn-lab-shell .kn-lab-instructions li::marker {
  color: var(--kn-accent);
}

.kn-lab-shell .kn-lab-instructions li + li {
  margin-top: 0.35rem;
}

.kn-lab-shell .kn-lab-teaching-point {
  max-width: 92ch;
  margin: 0.8rem 0 0;
  padding: 0.7rem 0.8rem;
  border-left: 3px solid var(--kn-accent);
  border-radius: 0 var(--kn-radius-sm) var(--kn-radius-sm) 0;
  background: var(--kn-accent-soft);
  color: #e8e1d5;
  font-size: 0.82rem;
  line-height: 1.5;
}

.kn-lab-shell .kn-lab-teaching-point strong {
  color: #f7f3ea;
}

@media (max-width: 768px) {


  .kn-lab-shell {
    padding: 0.9rem;
  }

  .kn-lab-banner {
    aspect-ratio: 2.4 / 1;
    min-height: 130px;
  }

  .kn-lab-footer {
    display: grid;
  }
}