:root {
  --color-text: #222;
  --color-heading: #1a1a1a;
  --color-border: #e0e0e0;
  --color-card-border: #e8e8e8;
  --color-bg-light: #f8f8f8;
  --color-bg-img: #f5f5f5;
  --color-white: #fff;
  --color-border-hover: #ccc;
  --color-icon: #888;
  --color-shadow: rgba(0, 0, 0, 0.04);
  --font-family: 'Poppins', sans-serif;
  --radius: 6px;
  --shadow-card: 0 4px 12px var(--color-shadow);
  --transition: 0.2s ease;
  --max-width: 1440px;
  --gap-lg: 50px;
  --gap-md: 30px;
  --gap-sm: 20px;
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

.page-wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px 60px;
}

h2 {
  font-weight: 700;
  font-size: 28px;
  line-height: 1.3;
  color: var(--color-heading);
  margin: 0 0 12px 0;
  letter-spacing: -0.01em;
}

h3 {
  font-weight: 400;
  font-size: 20px;
  line-height: 1.4;
  color: var(--color-heading);
  margin: 0 0 10px 0;
}

p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  margin: 0 0 14px 0;
}

.module {
  margin-bottom: 60px;
}

.module:last-child {
  margin-bottom: 0;
}

.structure-wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 40px var(--gap-lg);
}

.structure-text {
  flex: 1 1 52%;
  min-width: 280px;
}

.structure-text .layer {
  margin-bottom: 20px;
}

.structure-text .layer:last-child {
  margin-bottom: 0;
}

.structure-text .layer h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.structure-text .layer p {
  margin-bottom: 0;
}

.structure-image {
  flex: 0 1 38%;
  min-width: 240px;
}

.structure-image img {
  width: 100%;
  max-width: 420px;
  display: block;
  border-radius: var(--radius);
  background: var(--color-bg-img);
}

.spec-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: 6px;
  border-radius: var(--radius);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 16px;
  background: var(--color-white);
}

.spec-table thead th {
  padding: 12px 18px;
  text-align: left;
  font-weight: 700;
  background: var(--color-bg-light);
  border-bottom: 2px solid var(--color-border);
  color: var(--color-heading);
}

.spec-table td,
.spec-table th {
  padding: 12px 18px;
  border: 1px solid var(--color-border);
  vertical-align: middle;
  text-align: left;
}

.spec-table .label-cell {
  font-weight: 700;
  background: var(--color-bg-light);
  width: 42%;
  min-width: 140px;
}

.features-text ul {
  list-style: disc;
  padding-left: 20px;
  margin: 0;
}

.features-text ul li {
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 4px;
}

.app-intro {
  margin-bottom: 28px;
}

.app-intro p {
  margin-bottom: 0;
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap-md);
  margin-top: 10px;
}

.app-card {
  background: var(--color-white);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius);
  padding: 20px 20px 18px;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition);
}

.app-card:hover {
  border-color: var(--color-border-hover);
}

.app-img-box {
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: 4px;
  background: var(--color-bg-img);
  margin-bottom: 14px;
}

.app-img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.app-card h3 {
  font-size: 19px;
  margin-bottom: 6px;
}

.app-card .desc {
  margin-bottom: 10px;
}

.factory-wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 40px var(--gap-lg);
}

.factory-text {
  flex: 1 1 42%;
  min-width: 260px;
  display: flex;
  flex-direction: column;
}

.factory-text h3 {
  margin-bottom: 12px;
}

.factory-text p {
  margin-bottom: 14px;
}

.factory-text ul {
  list-style: disc;
  padding-left: 20px;
  margin: 4px 0 10px;
}

.factory-text ul li {
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 2px;
}

.factory-text ul li:last-child {
  margin-bottom: 0;
}

.factory-gallery {
  flex: 1 1 48%;
  min-width: 280px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.factory-gallery img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  display: block;
  border-radius: var(--radius);
  background: var(--color-bg-img);
  object-fit: cover;
}

.qc-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
  margin-top: 4px;
  list-style: none;
  padding: 0;
}

.qc-item {
  flex: 1 1 180px;
  background: var(--color-white);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius);
  padding: 20px 18px;
  text-align: center;
  transition: border-color var(--transition);
}

.qc-item:hover {
  border-color: var(--color-border-hover);
}

.qc-item p {
  font-weight: 400;
  margin-bottom: 0;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-item {
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius);
  background: var(--color-white);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item:hover {
  border-color: var(--color-border-hover);
}

.faq-item summary {
  font-weight: 700;
  font-size: 16px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  color: var(--color-heading);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "\25B8";
  font-size: 20px;
  line-height: 1;
  color: var(--color-icon);
  transition: transform 0.25s ease;
  margin-left: 12px;
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  transform: rotate(90deg);
}

.faq-item .faq-answer {
  padding: 0 20px 18px 20px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
}

.faq-item .faq-answer p {
  margin-bottom: 0;
}

@media (max-width: 992px) {
  .page-wrap {
    padding: 32px 20px 48px;
  }
  .structure-wrap,
  .factory-wrap {
    gap: var(--gap-md);
  }
  .factory-gallery {
    gap: 10px;
  }
  .app-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .page-wrap {
    padding: 24px 16px 40px;
  }
  h2 {
    font-size: 24px;
    margin-bottom: 10px;
  }
  h3 {
    font-size: 18px;
  }
  .structure-wrap {
    flex-direction: column;
    gap: 24px;
  }
  .structure-text,
  .structure-image {
    flex: 1 1 auto;
    min-width: 0;
    width: 100%;
  }
  .structure-image img {
    max-width: 100%;
  }
  .factory-wrap {
    flex-direction: column;
    align-items: stretch;
    gap: 24px;
  }
  .factory-text {
    flex: 1 1 auto;
    min-width: 0;
    width: 100%;
  }
  .factory-gallery {
    flex: 1 1 auto;
    min-width: 0;
    width: 100%;
    gap: 8px;
  }
  .factory-gallery img {
    aspect-ratio: 4 / 3;
  }
  .app-grid {
    grid-template-columns: 1fr;
    gap: var(--gap-sm);
  }
  .spec-table td,
  .spec-table th {
    padding: 10px 14px;
    font-size: 15px;
  }
  .spec-table .label-cell {
    min-width: 100px;
    width: 28%;
  }
  .qc-item {
    flex: 1 1 140px;
  }
}

@media (max-width: 480px) {
  .page-wrap {
    padding: clamp(14px, 4vw, 18px) clamp(10px, 3vw, 12px) 32px;
  }
  h2 {
    font-size: 20px;
    margin-bottom: 8px;
  }
  h3 {
    font-size: 16px;
  }
  .spec-table td,
  .spec-table th {
    padding: 8px 10px;
    font-size: 14px;
  }
  .spec-table .label-cell {
    min-width: 80px;
    width: 26%;
  }
  .factory-gallery {
    gap: 6px;
  }
  .structure-wrap,
  .factory-wrap {
    gap: 18px;
  }
  .module {
    margin-bottom: 40px;
  }
  .faq-item summary {
    padding: 14px 16px;
    font-size: 15px;
  }
  .faq-item .faq-answer {
    padding: 0 16px 14px 16px;
    font-size: 15px;
  }
  .qc-item {
    flex: 1 1 100%;
    padding: 16px;
  }
  .app-card {
    padding: 16px 16px 14px;
  }
  .app-img-box {
    aspect-ratio: 16 / 9;
  }
}