/* ============================================
   1. 服务卡片
   ============================================ */
.services-section {
  margin-bottom: 60px;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.service-card {
  background: var(--gray-bg);
  border-radius: 14px;
  padding: 40px 30px 30px;
  position: relative;
  transition: all .3s;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 36px;
  height: 36px;
  background: var(--lime);
  border-radius: 0 0 10px 0;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, .08);
}

.service-card .service-icon {
  font-size: 28px;
  color: var(--base);
  margin-bottom: 20px;
  display: block;
}

.service-card h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--base);
  margin-bottom: 10px;
}

.service-card p {
  font-size: 14px;
  color: var(--gray-dark);
  line-height: 1.8;
  margin: 0;
}

/* ============================================
   2. Tab 环形切换
   ============================================ */
.tab-section {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-bottom: 60px;
}

.tab-ring {
  grid-row: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all .35s;
}

.ring-inner {
  width: 240px;
  height: 240px;
  border-radius: 50%;
  border: 10px solid var(--gray-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: #fff;
  transition: all .35s;
  padding: 20px;
}

.ring-inner img {
  width: 85px;
  height: 85px;
  object-fit: contain;
  border-radius: 50%;
}

.ring-inner span {
  font-size: 16px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  text-align: center;
}

.tab-ring:hover .ring-inner,
.tab-ring.active .ring-inner {
  border-color: var(--lime);
  box-shadow: 0 0 0 4px rgba(185, 224, 53, .15), 0 8px 32px rgba(0, 0, 0, .08);
}

.tab-ring.active .ring-inner {
  transform: scale(1.05);
}

.tab-content {
  grid-column: 1 / -1;
  display: none;
  margin-top: 40px;
}

.tab-content.active {
  display: block;
}

.tab-panel {
  background: var(--gray-bg);
  border-radius: 14px;
  padding: 50px;
  position: relative;
  display: flex;
  gap: 50px;
  align-items: flex-start;
}

.tab-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 36px;
  height: 36px;
  background: var(--lime);
  border-radius: 0 0 10px 0;
}

.tab-panel .tab-text {
  flex: 1;
}

.tab-panel .tab-text h3 {
  font-size: 24px;
  font-weight: 700;
  color: var(--base);
  margin-bottom: 20px;
}

.tab-panel .tab-text p {
  font-size: 15px;
  color: var(--gray-dark);
  line-height: 1.9;
  margin-bottom: 10px;
}

.tab-panel .tab-img {
  flex-shrink: 0;
  width: 380px;
  height: 280px;
  border-radius: 12px;
  overflow: hidden;
}

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

/* ============================================
   3. 产品展示
   ============================================ */
.product-subtitle {
  font-size: 15px;
  color: var(--gray-dark);
  line-height: 1.8;
  margin-bottom: 40px;
  max-width: 900px;
}

.product-row {
  display: grid;
  grid-template-columns: 6fr 4fr;
  gap: 60px;
  align-items: start;
}

.product-text h4 {
  font-size: 20px;
  font-weight: 700;
  color: var(--base);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--lime);
  display: inline-block;
}

.product-text .specs {
  font-size: 14px;
  color: var(--gray-dark);
  line-height: 2.2;
}

.service-img {
  width: 100%;
  height: 280px;
  border-radius: 12px;
  overflow: hidden;
}

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

/* --- 产品分隔线（20% lime + 80% 灰） --- */
.product-divider {
  display: flex;
  height: 3px;
  margin: 20px 0;
  border-radius: 2px;
  overflow: hidden;
}

.divider-lime {
  width: 20%;
  background: var(--lime);
}

.divider-gray {
  width: 80%;
  background: var(--gray-light);
}

/* --- 产品图片 --- */
.product-img {
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
}

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

/* ============================================
   4. 设计考量（5列平分）
   ============================================ */
.design-section {
  position: relative;
}

.design-section h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--base);
  margin-bottom: 30px;
}

.design-icons {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.design-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  padding: 20px;
}

.design-item img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid transparent;
  transition: all .3s;
}

.design-item span {
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-dark);
  text-align: center;
  line-height: 1.4;
}