.solution-lab {
  margin-top: 2.25rem;
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
  background: #fff;
}
.lab-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  background: var(--ice);
  border-bottom: 1px solid var(--line);
}
.lab-option {
  position: relative;
  text-align: left;
  padding: 1.25rem 1.35rem;
  border: 0;
  border-right: 1px solid var(--line);
  color: var(--text-muted);
  background: transparent;
  cursor: pointer;
  font: inherit;
  transition: background .2s, color .2s;
}
.lab-option:last-child { border-right: 0; }
.lab-option > span {
  float: right;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--accent);
}
.lab-option strong {
  display: block;
  margin-bottom: 0.3rem;
  color: var(--text);
  font-size: 1.02rem;
  letter-spacing: -0.02em;
}
.lab-option small {
  display: block;
  font-size: 0.86rem;
  line-height: 1.45;
}
.lab-option[aria-pressed="true"] {
  background: #fff;
  color: var(--text);
  box-shadow: inset 0 -3px var(--accent);
}
.lab-option:hover { background: #fff; }
.lab-option:focus-visible {
  outline: 3px solid rgba(8, 126, 168, 0.45);
  outline-offset: -3px;
}
.lab-stage {
  padding: 1.5rem 1.6rem 1rem;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(8, 126, 168, 0.08), transparent 58%),
    var(--ice);
}
.lab-topline,
.lab-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}
.lab-topline b { font-weight: 700; color: var(--accent); }
.lab-demo {
  letter-spacing: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  background: #fff;
  font-weight: 700;
}
.lab-scene {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 56px minmax(0, 1.15fr) 56px minmax(0, 1fr);
  align-items: center;
  max-width: 920px;
  margin: 2.2rem auto;
  min-height: 180px;
}
.lab-step {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 168px;
  padding: 1.1rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  text-align: center;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
  transition: border-color .3s, box-shadow .3s, transform .3s;
}
.lab-step small {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--accent);
}
.lab-step strong {
  font-size: 1.02rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text);
}
.lab-step > span:last-child {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
}
.lab-symbol { font-size: 1.35rem; color: var(--accent); line-height: 1; }
.lab-core {
  min-height: 196px;
  background: var(--ink);
  border-color: transparent;
  color: #fff;
}
.lab-core small { color: var(--accent-soft); }
.lab-core strong { color: #fff; }
.lab-core > span:last-child { color: var(--text-light-muted); }
.lab-core-mark { font-size: 1.7rem; line-height: 1; color: var(--accent-soft); }
.lab-orbit {
  position: absolute;
  inset: -8px;
  border: 1px solid rgba(0, 172, 200, 0.35);
  border-radius: 22px;
  pointer-events: none;
}
.lab-wire {
  position: relative;
  height: 2px;
  background: #d5dee8;
  overflow: hidden;
}
.lab-wire i {
  position: absolute;
  top: 0;
  left: -18px;
  width: 18px;
  height: 2px;
  background: var(--accent);
}
.solution-lab.is-running .lab-wire i { animation: lab-flow 1.1s linear infinite; }
.solution-lab.is-running .lab-wire i:nth-child(2) { animation-delay: .35s; }
.solution-lab.is-running .lab-wire i:nth-child(3) { animation-delay: .7s; }
.solution-lab.is-running .lab-orbit { animation: lab-pulse 1.3s ease-in-out infinite; }
.lab-step.is-active {
  border-color: var(--accent);
  box-shadow: 0 14px 34px rgba(8, 126, 168, 0.16);
  transform: translateY(-4px);
}
.lab-step.is-done { border-color: rgba(8, 126, 168, 0.45); }
.lab-result {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.25rem 0 0.4rem;
  border-top: 1px solid var(--line);
}
.lab-caption {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--accent);
}
.lab-result h3 {
  margin: 0.35rem 0;
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  letter-spacing: -0.03em;
  line-height: 1.25;
}
.lab-result p {
  margin: 0;
  max-width: 62ch;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}
.lab-bottom { min-height: 2.2rem; letter-spacing: 0; font-size: 0.86rem; }
.lab-bottom > span:last-child { color: #8b95a7; white-space: nowrap; }
@keyframes lab-flow { from { left: -18px; } to { left: 100%; } }
@keyframes lab-pulse { 50% { border-color: rgba(0, 172, 200, 0.8); transform: scale(1.02); } }
@media (max-width: 900px) {
  .lab-option { padding: 1rem; }
  .lab-option strong { font-size: 0.95rem; }
  .lab-scene { grid-template-columns: minmax(0, 1fr) 22px minmax(0, 1.1fr) 22px minmax(0, 1fr); margin: 1.6rem auto; }
  .lab-step strong { font-size: 0.92rem; }
  .lab-result { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 640px) {
  .solution-lab { border-radius: 16px; }
  .lab-options { grid-template-columns: 1fr; }
  .lab-option { padding: 0.95rem 1rem; border-right: 0; border-bottom: 1px solid var(--line); }
  .lab-option > span { float: left; margin: 0.15rem 0.7rem 0 0; }
  .lab-option strong { margin-bottom: 0; }
  .lab-option small { margin-left: 1.8rem; }
  .lab-option[aria-pressed="true"] { box-shadow: inset 3px 0 var(--accent); }
  .lab-stage { padding: 1.1rem 0.9rem 0.7rem; }
  .lab-topline { align-items: flex-start; flex-direction: column; }
  .lab-scene { grid-template-columns: 1fr; max-width: 320px; margin: 1.3rem auto; }
  .lab-step, .lab-core { min-height: 0; }
  .lab-wire { width: 2px; height: 28px; margin: 0 auto; }
  .lab-wire i { width: 2px; height: 10px; }
  .solution-lab.is-running .lab-wire i { animation-name: lab-flow-down; }
  .lab-bottom > span:last-child { display: none; }
}
@keyframes lab-flow-down { from { top: -10px; left: 0; } to { top: 100%; left: 0; } }
@media (prefers-reduced-motion: reduce) {
  .solution-lab * { animation: none !important; transition: none !important; }
  .lab-step.is-active { transform: none; }
}