/* ─── SANDBOX HERO ─── */
.sandbox-hero {
  padding: 140px 0 80px;
  border-bottom: 2px solid var(--ink);
  min-height: 100dvh;
  display: flex;
  align-items: center;
}

.sandbox-hero-inner {
  max-width: 640px;
}

.sandbox-hero-label {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-faint);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.sandbox-hero-label::before {
  content: '';
  display: block;
  width: 16px;
  height: 1px;
  background: var(--rule);
}

.sandbox-hero h1 {
  font-family: var(--display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: 1.25rem;
}

.sandbox-hero p {
  font-size: 0.95rem;
  color: var(--ink-light);
  max-width: 520px;
  line-height: 1.75;
}

/* ─── EXPERIMENTS SECTION ─── */
.experiments-section {
  padding: 80px 0;
}

/* ─── EXPERIMENT CARDS (2-col grid) ─── */
.experiments-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--rule-light);
  border: 1px solid var(--rule-light);
}

.experiment-card {
  background: var(--paper);
  padding: 2rem;
  text-decoration: none;
  color: inherit;
  transition: background 0.2s var(--ease);
  display: flex;
  flex-direction: column;
  position: relative;
}

.experiment-card:hover {
  background: var(--paper-dark);
}

.experiment-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  opacity: 0;
  transition: opacity 0.2s;
}

.experiment-card:hover::before { opacity: 1; }
.experiment-card[data-accent="green"]::before { background: var(--green); }
.experiment-card[data-accent="blue"]::before { background: var(--blue); }
.experiment-card[data-accent="amber"]::before { background: var(--amber); }

.experiment-card-number {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-ghost);
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}

.experiment-card-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 2px;
  border: 1px solid currentColor;
  align-self: flex-start;
  margin-top: 1.25rem;
}

.experiment-card-tag.tag-blue { background: var(--blue-light); color: var(--blue); }
.experiment-card-tag.tag-green { background: var(--green-light); color: var(--green); }
.experiment-card-tag.tag-amber { background: var(--amber-light); color: var(--amber); }

.experiment-card-name {
  font-family: var(--display);
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: 0.5rem;
}

.experiment-card-summary {
  font-size: 0.85rem;
  color: var(--ink-light);
  line-height: 1.65;
  flex: 1;
}

.experiment-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 1.25rem;
  transition: gap 0.2s var(--ease);
}

.experiment-card:hover .experiment-card-link { gap: 10px; }
.experiment-card-link .material-icons-outlined { font-size: 14px; }

.experiment-card[data-accent="blue"] .experiment-card-link { color: var(--blue); }
.experiment-card[data-accent="green"] .experiment-card-link { color: var(--green); }
.experiment-card[data-accent="amber"] .experiment-card-link { color: var(--amber); }

/* ─── RESPONSIVE ─── */
@media (max-width: 900px) {
  .sandbox-hero { padding: 100px 0 60px; }
  .experiments-section { padding: 60px 0; }
}

@media (max-width: 600px) {
  .sandbox-hero { padding: 80px 0 40px; }
  .sandbox-hero h1 { font-size: 2.4rem; }
  .experiments-section { padding: 48px 0; }
  .experiments-grid { grid-template-columns: 1fr; }
}