:root {
  --bg-1: #ffd9ca;
  --bg-2: #efdaf9;
  --bg-3: #ffe7cc;
  --bg-4: #ffdcd2;
  --ink: #2f252c;
  --card: rgba(255, 249, 245, 0.72);
  --card-border: rgba(255, 240, 234, 0.74);
  --btn-bg: #4f3140;
  --btn-fg: #fff7f5;
  --link: #684355;
}

* {
  box-sizing: border-box;
}

body.da-bg-lab {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  font-family: "DM Sans", system-ui, sans-serif;
  color: var(--ink);
  background: #e8e1ef;
}

.bg-layer {
  position: fixed;
  inset: -12vmax;
  pointer-events: none;
}

.bg-layer--base {
  background: radial-gradient(circle at 10% 10%, var(--bg-1) 0%, transparent 40%),
    radial-gradient(circle at 90% 30%, var(--bg-2) 0%, transparent 42%),
    radial-gradient(circle at 30% 90%, var(--bg-3) 0%, transparent 44%),
    radial-gradient(circle at 80% 85%, var(--bg-4) 0%, transparent 38%),
    linear-gradient(140deg, #f6f3ff 0%, #e4eef8 52%, #f5efe8 100%);
  filter: saturate(110%);
  animation: driftBase 22s ease-in-out infinite alternate;
}

.bg-layer--lava::before,
.bg-layer--lava::after {
  content: "";
  position: absolute;
  width: 58vmax;
  height: 58vmax;
  border-radius: 50%;
  mix-blend-mode: screen;
  filter: blur(48px);
  opacity: 0.7;
}

.bg-layer--lava::before {
  top: 8%;
  left: 14%;
  background: radial-gradient(circle at 30% 30%, color-mix(in srgb, var(--bg-1) 72%, #ffffff 28%) 0%, transparent 68%);
  animation: lavaOne 20s ease-in-out infinite;
}

.bg-layer--lava::after {
  right: 8%;
  bottom: 0;
  background: radial-gradient(circle at 45% 40%, color-mix(in srgb, var(--bg-2) 72%, #ffffff 28%) 0%, transparent 70%);
  animation: lavaTwo 24s ease-in-out infinite reverse;
}

.bg-layer--grain {
  opacity: 0.22;
  background-image: radial-gradient(rgba(255, 255, 255, 0.4) 0.6px, transparent 0.7px);
  background-size: 2.6px 2.6px;
}

.bg-cursor-halo {
  --x: 50vw;
  --y: 50vh;
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background: radial-gradient(circle 250px at var(--x) var(--y), rgba(255, 255, 255, 0.34) 0%, transparent 74%);
  transition: background 120ms linear;
}

.lab-shell {
  position: relative;
  z-index: 2;
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(1.2rem, 3vw, 2rem);
}

.lab-header h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.4rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
}

.lab-header h1 span {
  display: block;
  margin-top: 0.35rem;
  font-family: "Source Serif 4", serif;
  font-style: italic;
  font-size: 0.8em;
  color: color-mix(in srgb, var(--ink) 70%, #6e4f89 30%);
}

.lab-kicker {
  margin: 0 0 0.4rem;
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.7;
}

.lab-intro {
  max-width: 64ch;
  margin-top: 1rem;
  line-height: 1.55;
}

.preview-card {
  margin-top: 0.7rem;
  padding: clamp(1rem, 4vw, 1.5rem);
  border-radius: 20px;
  background: var(--card);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(9px);
  box-shadow: 0 16px 45px rgba(30, 22, 37, 0.18);
}

.preview-overline {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.62;
}

.preview-card h2 {
  margin: 0.4rem 0 0.6rem;
  font-size: clamp(1.15rem, 3vw, 1.55rem);
}

.preview-card p {
  margin: 0;
  line-height: 1.52;
}

.preview-actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.preview-btn {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0.45rem 1rem;
  border-radius: 10px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  text-decoration: none;
  font-weight: 600;
}

.preview-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  color: var(--link);
  text-underline-offset: 0.2em;
}

.lab-note {
  margin-top: 0.9rem;
  font-size: 0.82rem;
  opacity: 0.8;
}

@keyframes driftBase {
  0% {
    transform: translate3d(-1.5%, -1.2%, 0) scale(1);
  }
  100% {
    transform: translate3d(1.8%, 1.5%, 0) scale(1.05);
  }
}

@keyframes lavaOne {
  0% {
    transform: translate3d(-6%, -8%, 0) scale(0.95);
  }
  50% {
    transform: translate3d(12%, 4%, 0) scale(1.05);
  }
  100% {
    transform: translate3d(4%, 11%, 0) scale(1);
  }
}

@keyframes lavaTwo {
  0% {
    transform: translate3d(4%, 4%, 0) scale(1);
  }
  50% {
    transform: translate3d(-10%, -6%, 0) scale(0.92);
  }
  100% {
    transform: translate3d(-3%, 9%, 0) scale(1.04);
  }
}

@media (prefers-reduced-motion: reduce) {
  .bg-layer--base,
  .bg-layer--lava::before,
  .bg-layer--lava::after {
    animation: none;
  }
}