.hero {
  padding: 30px 0 40px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  /* align-items: center; */
  align-items: flex-start;
}

.hero-img {
  background: #f8f8f8;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  /* padding: 30px; */
  /* min-height: 320px; */
  /* padding-top: 30px; */
  /* padding-bottom: 30px; */
}

.hero .hero-img img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: contain;
}

.hero-info h1 {
  font-size: var(--font35);
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 12px;
  line-height: 1.3;
}

.hero-overview {
  margin-bottom: 18px;
  overflow-wrap: break-word;
}

.hero-overview p {
  font-size: var(--font16);
  color: #666;
  line-height: 1.8;
  margin-bottom: 8px;
}

.hero-overview p:last-child {
  margin-bottom: 0;
}

.hero-overview .red-text {
  color: #c8102e;
  font-weight: 600;
}

.hero-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 20px;
  margin-bottom: 22px;
}

.feature-item {
  padding: 6px 0;
  border-bottom: 1px solid #f0f0f0;
}

.feature-title {
  font-size: var(--font16);
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 2px;
}

.feature-desc {
  font-size: var(--font14);
  color: #888;
  line-height: 1.4;
}

/* 产品概述（左文右图） */
.overview-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 36px;
  align-items: start;
}

.overview-text img,
.overview-text video {
  max-width: 100%;
  height: auto;
  vertical-align: top;
}

.overview-text {
  overflow-wrap: break-word;
}

.overview-text p {
  font-size: var(--font18);
  color: #555;
  line-height: 1.9;
  margin-bottom: 12px;
}

.overview-text .red-text {
  color: #c8102e;
  font-weight: 600;
}

.overview-text ul {
  margin: 12px 0;
  padding-left: 20px;
}

.overview-text li {
  font-size: var(--font16);
  color: #666;
  margin-bottom: 6px;
  line-height: 1.7;
}

.principle-svg {
  background: #fff;
  border: 1px solid #eee;
  border-radius: 8px;
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.principle-svg img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* 产品外型（卡片式，一行2个，可多行） */
.appearance-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 24px;
}

.appearance-card {
  background: #fff;
  border: 1px solid #eee;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.appearance-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.appearance-card-img {
  display: flex;
  align-items: center;
  justify-content: center;
  color: #aaa;
  font-size: var(--font16);
  border-bottom: 1px solid #eee;
}

.appearance-card-img img {
  display: block;
  width: 100%;
  height: auto;
}

.appearance-card-body {
  padding: 14px 16px;
}

.appearance-card-body h4 {
  font-size: var(--font18);
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 4px;
}

.appearance-card-body p {
  font-size: var(--font15);
  color: #888;
  line-height: 1.5;
}

.hero-params {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 20px;
  margin-bottom: 24px;
}

.param-item {
  display: flex;
  flex-direction: column;
  padding: 8px 0;
  border-bottom: 1px solid #f0f0f0;
}

.param-label {
  font-size: var(--font15);
  color: #999;
  margin-bottom: 2px;
}

.param-value {
  font-size: var(--font20);
  font-weight: 600;
  color: #1a1a1a;
}

.hero-btns {
  display: flex;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  border-radius: 4px;
  font-size: var(--font18);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

.btn .icon {
  width: 18px;
}

.btn .icon img {
  display: block;
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
}

.btn-primary {
  background: #c8102e;
  color: #fff;
}

.btn-primary:hover {
  background: #a50d26;
}

.btn-outline {
  background: #fff;
  color: #c8102e;
  border: 1px solid #c8102e;
}

.btn-outline:hover {
  background: #fef2f2;
}

/* 通用 section */
section {
  padding: 40px 0;
}

section:nth-child(even) {
  background: #fafafa;
}

.section-title {
  font-size: var(--font26);
  font-weight: 700;
  color: #1a1a1a;
  padding-left: 12px;
  border-left: 4px solid #c8102e;
  margin-bottom: 8px;
}

.section-sub {
  font-size: var(--font16);
  color: #999;
  padding-left: 16px;
}

/* 产品概述（含原理，左文右图） */
.overview-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 36px;
  align-items: start;
  margin-top: 24px;
}

.overview-text p {
  font-size: var(--font18);
  color: #555;
  line-height: 1.9;
  margin-bottom: 14px;
}

.overview-text strong {
  color: #c8102e;
  font-weight: 600;
}

.overview-text ul {
  margin: 12px 0;
  padding-left: 20px;
}

.overview-text li {
  font-size: var(--font16);
  color: #666;
  margin-bottom: 6px;
  line-height: 1.7;
}

.principle-svg {
  background: #fff;
  border: 1px solid #eee;
  border-radius: 8px;
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 核心优势 */
.adv-group {
  margin-bottom: 32px;
}

.adv-group:last-child {
  margin-bottom: 0;
}

.adv-group-title {
  font-size: var(--font26);
  font-weight: 700;
  color: #1a1a1a;
  padding-left: 12px;
  border-left: 4px solid #c8102e;
  margin-bottom: 16px;
}

.adv-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.adv-card {
  background: #fff;
  border: 1px solid #eee;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.adv-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.adv-card-img {
  background: #f5f5f5;
  display: flex;
  align-items: center;
  justify-content: center;
}

.adv-card-img img {
  display: block;
  width: 100%;
  height: auto;
}

.adv-card-body {
  padding: 16px;
}

.adv-card-body h4 {
  font-size: var(--font20);
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 6px;
}

.adv-card-body p {
  font-size: var(--font16);
  color: #666;
  line-height: 1.7;
}

/* 规格参数表 */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font16);
  margin-top: 24px;
}

.spec-table table {
  min-width: 100%;
  border-collapse: collapse;
}

.spec-table th {
  background: #f0f0f0;
  color: #333;
  font-weight: 600;
  padding: 10px 14px;
  text-align: center;
  border: 1px solid #e0e0e0;
}

.spec-table td {
  padding: 9px 14px;
  border: 1px solid #e8e8e8;
  color: #555;
}

.spec-table td:first-child {
  background: #fafafa;
  font-weight: 500;
  color: #333;
  width: 140px;
}

.spec-table td:not(:first-child) {
  text-align: center;
}

/* 应用场景 */
.app-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}

.app-card {
  background: #fff;
  border: 1px solid #eee;
  border-radius: 8px;
  overflow: hidden;
}

.app-card-img {
  background: #f0f0f0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #aaa;
  font-size: var(--font15);
}

.app-card-img img {
  display: block;
  width: 100%;
  height: auto;
}

.app-card-body {
  padding: 12px 14px;
}

.app-card-body h4 {
  font-size: var(--font18);
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 4px;
}

.app-card-body p {
  font-size: var(--font15);
  color: #888;
}

/* 文档下载 */
.download-list {
  background: #fff;
  border: 1px solid #eee;
  border-radius: 8px;
  overflow: hidden;
  margin-top: 24px;
}

.download-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid #f0f0f0;
}

.download-item:last-child {
  border-bottom: none;
}

.download-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.download-icon {
  width: 36px;
  height: 36px;
  background: #fef2f2;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #c8102e;
  font-size: var(--font16);
  font-weight: 700;
}

.download-name {
  font-size: var(--font18);
  color: #333;
  font-weight: 500;
}

.download-format {
  font-size: var(--font15);
  color: #999;
  margin-left: 8px;
}

.download-btn {
  padding: 6px 16px;
  background: #fff;
  border: 1px solid #c8102e;
  color: #c8102e;
  border-radius: 4px;
  font-size: var(--font16);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.download-btn:hover {
  background: #fef2f2;
}

/* FAQ */
.faq-list {
  margin-top: 24px;
}

.faq-item {
  background: #fff;
  border: 1px solid #eee;
  border-radius: 8px;
  margin-bottom: 10px;
  overflow: hidden;
}

.faq-q {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  cursor: pointer;
  user-select: none;
}

.faq-q-num {
  width: 24px;
  height: 24px;
  background: #c8102e;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font15);
  font-weight: 700;
  flex-shrink: 0;
}

.faq-q-text {
  flex: 1;
  font-size: var(--font18);
  font-weight: 500;
  color: #333;
}

.faq-q-arrow {
  color: #ccc;
  font-size: var(--font24);
  transition: transform 0.2s;
}

.faq-item.open .faq-q-arrow {
  transform: rotate(180deg);
}

.faq-a {
  display: none;
  padding: 0 18px 16px 54px;
  font-size: var(--font16);
  color: #666;
  line-height: 1.8;
}

/* .faq-item.open .faq-a {
  display: block;
} */

/* 配套产品 */
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.related-card {
  background: #fff;
  border: 1px solid #eee;
  border-radius: 8px;
  padding: 20px;
  text-align: center;
  transition: box-shadow 0.2s;
  text-decoration: none;
  color: inherit;
}

.related-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.related-icon {
  width: 48px;
  height: 48px;
  background: #fef2f2;
  border-radius: 8px;
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font35);
}

.related-icon img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.related-card h4 {
  font-size: var(--font18);
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 4px;
}

.related-card p {
  font-size: var(--font15);
  color: #888;
}

.product-detail-type3-page img {
  max-width: 100%;
  height: auto;
  vertical-align: top;
}
.product-detail-page .index-product {
  padding-top: 0;
  padding-bottom: 0;
}

.product-detail-page .index-product .index-product-list {
  margin-top: 24px;
}

@media (max-width: 576px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-info h1 {
    font-size: 24px;
  }

  .hero-features {
    grid-template-columns: 1fr;
  }

  .overview-grid {
    grid-template-columns: 1fr;
  }

  .overview-grid .overview-text {
    order: 1;
  }

  .adv-cards {
    grid-template-columns: repeat(1, 1fr);
  }

  .appearance-grid {
    grid-template-columns: repeat(1, 1fr);
  }

  .table-wrap {
    overflow-x: auto;
  }

  .table-wrap table {
    min-width: 800px !important;
  }

  .app-grid {
    grid-template-columns: repeat(1, 1fr);
  }

  .download-icon {
    font-size: 12px;
  }

  .download-item {
    flex-wrap: wrap;
    row-gap: 10px;
  }

  .download-item .download-info {
    width: 100%;
  }

  .download-item .download-btn {
    margin-left: auto;
  }

  .related-grid {
    grid-template-columns: repeat(1, 1fr);
  }
}