.lab {
  min-height: 100vh;
  background: #090512;
}

.lab-header,
.lab-main {
  width: min(1260px, calc(100% - 40px));
  margin-inline: auto;
}

.lab-header {
  position: relative;
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 70px;
  align-items: end;
  padding: 110px 0 62px;
}

.lab-header h1 {
  margin-bottom: 0;
  font-size: clamp(60px, 8vw, 110px);
}

.lab-header > p {
  max-width: 600px;
  margin: 0 0 10px;
  color: var(--muted);
}

.lab-header code {
  color: var(--violet-light);
  font-family: var(--font-mono);
  font-size: .9em;
}

.lab-back {
  position: absolute;
  top: 28px;
  left: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.lab-back:hover {
  color: var(--text);
}

.lab-toolbar {
  position: sticky;
  top: 12px;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: rgba(10,6,20,.82);
  backdrop-filter: blur(18px);
}

.lab-toolbar div {
  display: flex;
  align-items: center;
  gap: 6px;
}

.lab-toolbar div > span {
  margin: 0 8px;
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.lab-control {
  min-width: 52px;
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,.02);
  color: var(--muted);
  font-size: 11px;
  cursor: pointer;
}

.lab-control.is-active {
  border-color: var(--violet);
  background: var(--violet);
  color: #fff;
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.concept-card {
  display: grid;
  grid-template-columns: minmax(220px, .75fr) 1.25fr;
  grid-template-rows: auto 1fr;
  min-height: 360px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  transition: border-color .25s ease, transform .35s var(--ease);
}

.concept-card:hover,
.concept-card.is-selected {
  border-color: rgba(190,170,255,.42);
}

.concept-card:hover {
  transform: translateY(-3px);
}

.concept-meta {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.concept-card.is-selected .concept-meta b {
  color: var(--violet-light);
}

.concept-preview {
  display: grid;
  place-items: center;
  min-height: 290px;
  border: 0;
  border-right: 1px solid var(--line);
  background: #0a0614;
  color: #c2b2ff;
  cursor: pointer;
}

[data-preview-theme="light"] .concept-preview {
  background: #f4f2fa;
  color: #17102b;
}

[data-preview-theme="gradient"] .concept-preview {
  background: linear-gradient(145deg, #6d42e8, #1a0d3b);
  color: #fff;
}

.concept-preview svg {
  width: 128px;
  height: 128px;
  transition: width .3s var(--ease), height .3s var(--ease), transform .3s var(--ease);
}

[data-icon-size="small"] .concept-preview svg {
  width: 16px;
  height: 16px;
}

[data-icon-size="medium"] .concept-preview svg {
  width: 32px;
  height: 32px;
}

[data-icon-size="large"] .concept-preview svg {
  width: 128px;
  height: 128px;
}

.concept-preview:hover svg {
  transform: scale(1.05) rotate(-2deg);
}

.concept-copy {
  align-self: center;
  padding: 28px;
}

.concept-copy h2 {
  margin-bottom: 12px;
  font-size: 30px;
  letter-spacing: -.025em;
}

.concept-copy p {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 14px;
}

.concept-copy small {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.lab-selection {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 20px;
  margin: 24px 0 80px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,.018);
}

.lab-selection > span {
  grid-row: 1 / 3;
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.lab-selection strong {
  font-family: var(--font-display);
  font-size: 22px;
}

.lab-selection p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 980px) {
  .lab-header {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .concept-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .lab-header,
  .lab-main {
    width: calc(100% - 24px);
  }

  .lab-header {
    padding-top: 90px;
  }

  .lab-toolbar {
    position: static;
    flex-direction: column;
  }

  .lab-toolbar div {
    flex-wrap: wrap;
  }

  .concept-card {
    grid-template-columns: 1fr;
  }

  .concept-preview {
    min-height: 220px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
}