/* 首页智能物联 */
.iot-section {
  padding: 4.5rem 0 5rem;
  background: #f4f7fb;
}
.iot-head {
  text-align: center;
  max-width: 44rem;
  margin: 0 auto 2.5rem;
}
.iot-eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: #2563eb;
}
.iot-head h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  font-weight: 700;
  color: #111827;
  line-height: 1.35;
}
.iot-head p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: #4b5563;
}
.iot-badge {
  display: inline-block;
  margin-bottom: 0.65rem;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #1d4ed8;
  background: #dbeafe;
}
.iot-badge--live {
  color: #fff;
  background: linear-gradient(90deg, #6366f1, #ec4899 55%, #f59e0b);
  box-shadow: 0 8px 18px rgba(168, 85, 247, 0.35);
}
.iot-feature {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.5rem;
  align-items: stretch;
  margin-bottom: 1.5rem;
  padding: 1.85rem 1.85rem 1.6rem;
  border-radius: 1.15rem;
  background:
    radial-gradient(460px 200px at 0% 0%, rgba(99, 102, 241, 0.2), transparent 68%),
    radial-gradient(420px 220px at 100% 10%, rgba(236, 72, 153, 0.16), transparent 70%),
    radial-gradient(360px 180px at 78% 100%, rgba(34, 211, 238, 0.18), transparent 72%),
    linear-gradient(180deg, #fff 0%, #f8f7ff 100%);
  border: 1px solid transparent;
  box-shadow: 0 18px 44px rgba(99, 102, 241, 0.14);
}
.iot-feature::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  padding: 1.5px;
  border-radius: inherit;
  background: linear-gradient(120deg, #6366f1, #ec4899, #f59e0b, #22d3ee, #6366f1);
  background-size: 240% 100%;
  animation: iot-ai-flow 4.5s linear infinite;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  pointer-events: none;
}
.iot-feature > * {
  position: relative;
  z-index: 2;
}
@keyframes iot-ai-flow {
  to { background-position: 100% 50%; }
}
.iot-feature h3 {
  margin: 0 0 0.5rem;
  font-size: 1.35rem;
  background: linear-gradient(100deg, #4f46e5, #c026d3 48%, #ea580c);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.iot-feature-copy > p {
  margin: 0 0 0.85rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: #475569;
}
.iot-feature-copy ul,
.iot-card ul {
  margin: 0;
  padding-left: 1.1rem;
  color: #334155;
  font-size: 0.875rem;
  line-height: 1.7;
}
.iot-feature-visual {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.65rem;
}
.iot-kv {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 0.75rem;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(99, 102, 241, 0.16);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.06);
  font-size: 0.875rem;
}
.iot-kv span { color: #64748b; }
.iot-kv strong {
  font-weight: 700;
  background: linear-gradient(90deg, #4f46e5, #0891b2);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.iot-kv--warn {
  background: linear-gradient(90deg, #fff7ed, #fff);
  border-color: #fdba74;
}
.iot-kv--warn strong {
  background: none;
  -webkit-text-fill-color: #c2410c;
  color: #c2410c;
}
@media (prefers-reduced-motion: reduce) {
  .iot-feature::before { animation: none; }
}
.iot-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}
.iot-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 0.85rem;
  padding: 1.25rem 1.2rem 1.15rem;
}
.iot-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  color: #0f172a;
}
.iot-lead {
  margin: 0 0 0.75rem;
  font-size: 0.875rem;
  line-height: 1.65;
  color: #64748b;
}
.iot-note {
  margin: 1.5rem 0 0;
  text-align: center;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: #64748b;
}
@media (max-width: 992px) {
  .iot-feature,
  .iot-grid {
    grid-template-columns: 1fr;
  }
}