/* ===== IoT 解决方案 ===== */
.solution {
  padding: var(--section-py) 0;
  background: var(--dark);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.solution::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('../images/cloud-iot.jpg') center/cover no-repeat;
  opacity: .07;
}

.solution__grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(232,100,10,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232,100,10,.05) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.solution__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* 架构图卡片 */
.solution__arch {
  margin-top: 60px;
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 0;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
}

.arch-col {
  text-align: center;
  padding: 0 16px;
}

.arch-col__icon {
  width: 72px; height: 72px;
  margin: 0 auto 16px;
  background: rgba(255,255,255,.07);
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--trans);
}

.arch-col:hover .arch-col__icon {
  background: rgba(232,100,10,.25);
  border-color: var(--primary-light);
  transform: translateY(-4px);
}

.arch-col__icon svg {
  width: 36px; height: 36px;
  stroke: rgba(255,255,255,.75);
  fill: none;
  stroke-width: 1.5;
}

.arch-col__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 6px;
}

.arch-col__items {
  font-size: .8rem;
  color: rgba(255,255,255,.45);
  line-height: 1.9;
}

.arch-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--primary-light);
  padding: 0 8px;
}

.arch-arrow svg {
  width: 32px; height: 32px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5;
  opacity: .6;
}

.arch-arrow span {
  font-size: .68rem;
  color: rgba(255,255,255,.3);
  letter-spacing: .06em;
  text-transform: uppercase;
}

/* 特性卡片组 */
.solution__features {
  margin-top: 60px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.sol-feat {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: var(--trans);
}

.sol-feat:hover {
  background: rgba(232,100,10,.12);
  border-color: rgba(232,100,10,.4);
  transform: translateY(-4px);
}

.sol-feat__num {
  font-size: .8rem;
  font-weight: 700;
  color: var(--primary-light);
  letter-spacing: .1em;
  margin-bottom: 14px;
}

.sol-feat__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}

.sol-feat__desc {
  font-size: .84rem;
  color: rgba(255,255,255,.45);
  line-height: 1.7;
}

/* ===== 技术优势 ===== */
.tech {
  padding: var(--section-py) 0;
  background: var(--white);
}

.tech__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.tech__visual {
  position: relative;
}

.tech__img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 1.2;
}

.tech__img img {
  width: 100%; height: 100%;
  object-fit: cover;
}

.tech__float-card {
  position: absolute;
  bottom: -20px; right: -20px;
  background: var(--dark);
  border-radius: var(--radius-md);
  padding: 18px 24px;
  box-shadow: var(--shadow-md);
  color: var(--white);
  min-width: 200px;
}

.tech__float-card .fc-title {
  font-size: .75rem;
  color: rgba(255,255,255,.45);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 8px;
}

.tech__float-card .fc-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.tech__float-card .fc-bar-wrap {
  flex: 1;
  height: 6px;
  background: rgba(255,255,255,.1);
  border-radius: 3px;
  overflow: hidden;
}

.tech__float-card .fc-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 3px;
}

.tech__float-card .fc-pct {
  font-size: .8rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 36px;
  text-align: right;
}

.tech__float-card .fc-name {
  font-size: .78rem;
  color: rgba(255,255,255,.55);
  min-width: 56px;
}

.tech__content {}

.tech__grid {
  margin-top: 36px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.tech-item {
  padding: 24px 22px;
  background: var(--bg-light);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  transition: var(--trans);
}

.tech-item:hover {
  border-color: var(--primary);
  background: rgba(232,100,10,.04);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

.tech-item__icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: rgba(232,100,10,.1);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}

.tech-item__icon svg {
  width: 24px; height: 24px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

.tech-item__title {
  font-size: .92rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 5px;
}

.tech-item__desc {
  font-size: .82rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 响应式 */
@media (max-width: 1100px) {
  .solution__arch {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .arch-arrow { transform: rotate(90deg); }
  .solution__features { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .tech__inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .tech__float-card { display: none; }
}

@media (max-width: 600px) {
  .solution__features { grid-template-columns: 1fr; }
  .tech__grid { grid-template-columns: 1fr; }
}