/* ============================================================
   Product Detail Page Styles
   ============================================================ */

/* --- Product Hero --- */
.product-hero {
  position: relative;
  width: 100%;
  height: 50vh;
  min-height: 360px;
  max-height: 500px;
  background: var(--color-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.product-hero picture {
  display: block;
  flex: 0 0 auto;
  max-width: 500px;
  height: 80%;
}

.product-hero__img {
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 0 40px var(--color-glow-soft));
}

.product-hero__text {
  text-align: left;
  color: var(--color-white);
  margin-left: 60px;
}

.product-hero__title {
  font-size: clamp(14px, 2vw, 21px);
  font-weight: 500;
  letter-spacing: 2px;
  margin-bottom: 2px;
}

.product-hero__label {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary-light);
  letter-spacing: 1px;
  margin-bottom: 8px;
  display: inline-block;
  padding: 3px 10px;
  border: 1px solid var(--color-primary-light);
  border-radius: 1px;
}

.product-hero__subtitle {
  font-size: 14px;
  font-weight: 300;
  color: var(--color-light-glass-soft);
  letter-spacing: 2px;
  margin-top: 2px;
}

/* --- Product Series Navigation (cross-page switcher) --- */
.product-series-nav {
  background: var(--color-bg-light);
  border-bottom: 1px solid var(--color-border);
}

.product-series-nav__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 12px 40px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.product-series-nav__label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-light);
  letter-spacing: 0.5px;
  white-space: nowrap;
  flex-shrink: 0;
}

.product-series-nav__links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.product-series-nav__link {
  display: inline-block;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  letter-spacing: 0.5px;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.product-series-nav__link:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-white);
}

.product-series-nav__link--active {
  color: var(--color-white);
  background: var(--color-primary);
  border-color: var(--color-primary);
  pointer-events: none;
}

@media (max-width: 768px) {
  .product-series-nav__inner {
    padding: 10px 16px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .product-series-nav__link {
    padding: 5px 12px;
    font-size: 12px;
  }
}

/* --- Sticky Sub-Navigation --- */
.product-subnav {
  position: sticky;
  top: var(--nav-height);
  z-index: 900;
  background: var(--color-dark-glass);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-light-border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.product-subnav__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  gap: 0;
  min-width: max-content;
}

.product-subnav__link {
  display: block;
  padding: 16px 24px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-light-glass-soft);
  letter-spacing: 1px;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all 0.3s ease;
}

.product-subnav__link:hover {
  color: var(--color-white);
}

.product-subnav__link--active {
  color: var(--color-white);
  border-bottom-color: var(--color-primary-light);
}

/* --- Product Overview Section --- */
.product-overview {
  padding: 80px 0 60px;
  background: var(--color-white);
}

.product-overview .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.product-overview__apps-title,
.product-overview__features-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: 1px;
  color: var(--color-text);
}

.product-overview__apps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.product-overview__app {
  text-align: center;
  padding: 20px 12px;
  background: var(--color-bg-light);
  border-radius: 6px;
  font-size: 13px;
  color: var(--color-text);
  transition: all 0.3s ease;
}

.product-overview__app:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--color-shadow);
}

.product-overview__app-icon {
  font-size: 28px;
  display: block;
  margin-bottom: 8px;
}

.product-overview__app-icon--lucide {
  width: 26px;
  height: 26px;
  margin: 0 auto 10px;
  color: var(--color-primary);
  stroke-width: 1.5;
}
.product-overview__app-icon--lucide svg {
  width: 100%;
  height: 100%;
}
.product-overview__app-name {
  display: block;
  font-weight: 500;
  letter-spacing: 0.5px;
}

.product-overview__features-list {
  list-style: none;
  padding: 0;
}

.product-overview__features-list li {
  position: relative;
  padding: 12px 0 12px 24px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
}

.product-overview__features-list li:last-child {
  border-bottom: none;
}

.product-overview__features-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
}

/* --- Sub-Model Section --- */
.submodel-section {
  padding: 60px 0;
  border-top: 1px solid var(--color-border);
}

.submodel-section:nth-child(even) {
  background: var(--color-bg-light);
}

.submodel-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 40px;
}

.submodel-header__name {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 1px;
}

.submodel-header__label {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  padding: 3px 12px;
  border: 1px solid var(--color-primary);
  border-radius: 2px;
  letter-spacing: 1px;
}

/* --- Spec Tables --- */
.spec-block {
  margin-bottom: 48px;
}

.spec-block:last-child {
  margin-bottom: 0;
}

.spec-block__title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.spec-block__title::before {
  content: "";
  width: 3px;
  height: 18px;
  background: var(--color-primary);
  border-radius: 2px;
}

.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.spec-table-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  align-items: start;
}

.spec-table-split__column {
  min-width: 0;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  white-space: nowrap;
}

.spec-table th {
  background: var(--color-navy);
  color: var(--color-white);
  font-weight: 500;
  padding: 12px 16px;
  text-align: left;
  letter-spacing: 0.5px;
  position: sticky;
  top: 0;
}

.spec-table td {
  padding: 10px 16px;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
}

.spec-table tbody tr:nth-child(even) {
  background: rgba(89, 87, 87, 0.06);
}

.spec-table tbody tr:hover {
  background: rgba(201, 42, 31, 0.06);
}

.spec-table td:first-child,
.spec-table th:first-child {
  position: sticky;
  left: 0;
  z-index: 1;
  background: inherit;
}

.spec-table th:first-child {
  background: var(--color-navy);
  z-index: 2;
}

.spec-table tbody tr:nth-child(even) td:first-child {
  background: var(--color-bg-light);
}

.spec-table tbody tr:nth-child(odd) td:first-child {
  background: var(--color-white);
}

/* --- Naming Rules --- */
.naming-rules-section {
  padding: 40px 0;
}

.naming-example {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  padding: 32px 16px 24px;
  background: var(--color-white);
  border-radius: 8px 8px 0 0;
  border: 1px solid var(--color-border);
  border-bottom: none;
}

.naming-seg {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.naming-seg__code {
  font-size: 22px;
  font-weight: 700;
  font-family: "Courier New", Courier, monospace;
  color: var(--color-dark);
  padding: 8px 6px;
  letter-spacing: 1px;
  border-bottom: 2px solid var(--color-primary);
}

.naming-seg__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 11px;
  font-weight: 600;
  margin-top: 8px;
}

.naming-legend {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0;
  background: var(--color-white);
  border-radius: 0 0 8px 8px;
  border: 1px solid var(--color-border);
  border-top: none;
}

.naming-legend__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 20px;
  border-top: 1px solid var(--color-border);
  font-size: 14px;
  line-height: 1.6;
}

.naming-legend__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 11px;
  font-weight: 600;
  flex-shrink: 0;
}

.naming-legend__label {
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
}

.naming-legend__desc {
  color: var(--color-text-light);
}

@media (max-width: 768px) {
  .naming-seg__code {
    font-size: 16px;
    padding: 6px 4px;
  }

  .naming-seg__num,
  .naming-legend__num {
    width: 20px;
    height: 20px;
    min-width: 20px;
    font-size: 10px;
  }

  .naming-legend {
    grid-template-columns: 1fr;
  }

  .naming-legend__item {
    padding: 10px 16px;
    font-size: 13px;
  }
}

/* --- Dimension Drawing Images --- */
.dimension-images {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 20px 0;
  background: var(--color-white);
  border-radius: 8px;
}

.dimension-images__img {
  max-width: 48%;
  width: 100%;
  max-height: 400px;
  object-fit: contain;
}

@media (max-width: 768px) {
  .dimension-images {
    flex-direction: column;
    gap: 16px;
  }
  .dimension-images__img {
    max-width: 100%;
    max-height: 300px;
  }
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .product-hero {
    height: 40vh;
    min-height: 300px;
  }

  .product-hero__img {
    max-width: 240px;
  }

  .product-hero__text {
    margin-left: 40px;
  }

  .product-overview .container {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .product-subnav__inner {
    padding: 0 24px;
  }
}

@media (max-width: 768px) {
  .product-hero {
    flex-direction: column;
    height: auto;
    min-height: 0;
    padding: 100px 20px 40px;
    gap: 24px;
  }

  .product-hero__img {
    max-width: 180px;
  }

  .product-hero__text {
    margin-left: 0;
  }

  .product-hero__title {
    letter-spacing: 1px;
  }

  .product-subnav__inner {
    padding: 0 16px;
  }

  .product-subnav__link {
    padding: 12px 16px;
    font-size: 13px;
  }

  .product-overview {
    padding: 48px 0 32px;
  }

  .product-overview__apps-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .submodel-section {
    padding: 40px 0;
  }

  .submodel-header__name {
    font-size: 22px;
  }

  .spec-table {
    font-size: 12px;
  }

  .spec-table th,
  .spec-table td {
    padding: 8px 12px;
  }

}

/* ============================================================
   Spec Table card-mode on narrow screens (≤640px)
   ============================================================ */
@media (max-width: 640px) {
  .spec-table-split {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .table-responsive {
    overflow-x: visible;
    border: none;
    border-radius: 0;
    background: transparent;
  }

  .spec-table,
  .spec-table tbody,
  .spec-table tr,
  .spec-table td {
    display: block;
    width: 100%;
  }

  .spec-table thead {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
  }

  .spec-table tr {
    background: var(--color-white) !important;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 14px 16px;
    margin-bottom: 12px;
    box-shadow: 0 1px 3px rgba(22, 16, 15, 0.05);
  }

  .spec-table tbody tr td:first-child {
    background: transparent !important;
    position: static !important;
    padding: 0 0 10px;
    margin-bottom: 10px;
    border-bottom: 1px solid var(--color-border);
    font-weight: 700;
    font-size: 14px;
    color: var(--color-text);
    letter-spacing: 0.5px;
  }
  .spec-table tbody tr td:first-child::before {
    content: none;
  }

  .spec-table tbody tr td {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: baseline;
    gap: 12px;
    padding: 6px 0;
    border-bottom: none;
    font-size: 13px;
  }

  .spec-table tbody tr td::before {
    content: attr(data-label);
    font-size: 12px;
    color: var(--color-text-light);
    font-weight: 500;
    letter-spacing: 0.3px;
  }

  .spec-table tbody tr:nth-child(even),
  .spec-table tbody tr:nth-child(even) td:first-child,
  .spec-table tbody tr:nth-child(odd) td:first-child {
    background: var(--color-white) !important;
  }
  .spec-table tbody tr:hover { background: var(--color-white) !important; }
}