/* 硬件拓扑 · 接线示意 — service-topology.html */

.svc-topo-page {
  padding: 0 0 72px;
  --svc-topo-blue: #1d5198;
  --svc-topo-orange: var(--site-brand-orange, #f26522);
  --svc-topo-border: rgba(29, 81, 152, 0.22);
  --svc-topo-radius: 10px;
}

.svc-topo-page .visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* —— Hero —— */
.svc-topo-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.9fr);
  gap: 28px 36px;
  align-items: start;
  margin: 36px 0 28px;
  padding: 28px 30px;
  border: 1px solid #dce4ee;
  border-radius: 5px;
  background: linear-gradient(135deg, #f8fafc 0%, #eef3fa 100%);
}

.svc-topo-hero__eyebrow {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--svc-topo-blue);
}

.svc-topo-hero__title {
  margin: 0 0 12px;
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1.25;
  color: #0f2744;
}

.svc-topo-hero__lead {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: #495057;
  max-width: 62ch;
}

.svc-topo-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin: 0;
  font-size: 14px;
  line-height: 1.3;
  font-family: var(--site-ui-font, 'Segoe UI', system-ui, -apple-system, 'Microsoft YaHei', 'PingFang SC', sans-serif);
}

.svc-topo-hero__links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
  color: var(--menu-sub-brand, #1d5198);
  text-decoration: none;
}

.svc-topo-hero__links a:hover {
  color: var(--menu-sub-brand-hover, #16467f);
}

.svc-topo-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.svc-topo-stats li {
  padding: 14px 16px;
  border: 1px solid var(--svc-topo-border);
  border-radius: var(--svc-topo-radius);
  background: #fff;
  text-align: center;
}

.svc-topo-stats strong {
  display: block;
  font-size: 28px;
  line-height: 1.1;
  color: var(--svc-topo-blue);
}

.svc-topo-stats span {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: #667;
}

/* —— Toolbar —— */
.svc-topo-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  margin-bottom: 20px;
  padding: 16px 18px;
  border: 1px solid #dce4ee;
  border-radius: 5px;
  background: #f4f7fb;
}

.svc-topo-search {
  flex: 1 1 260px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 14px;
  background: #fff;
  border: 1px solid #ced4da;
  border-radius: 5px;
}

.svc-topo-search:focus-within {
  border-color: var(--svc-topo-blue);
  box-shadow: 0 0 0 3px rgba(29, 81, 152, 0.12);
}

.svc-topo-search .bx {
  font-size: 20px;
  color: #868e96;
}

.svc-topo-search input {
  flex: 1;
  border: 0;
  padding: 12px 0;
  font-size: 15px;
  outline: none;
  background: transparent;
}

.svc-topo-count {
  margin: 0;
  font-size: 14px;
  color: #6c757d;
  white-space: nowrap;
}

.svc-topo-count strong {
  color: var(--svc-topo-blue);
}

/* —— Layout —— */
.svc-topo-layout {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  margin-bottom: 48px;
}

.svc-topo-sidebar {
  position: sticky;
  top: 16px;
  max-height: calc(100vh - 32px);
  display: flex;
  flex-direction: column;
  border: 1px solid var(--svc-topo-border);
  border-radius: 5px;
  background: #fff;
  overflow: hidden;
}

.svc-topo-sidebar__filters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 12px;
  border-bottom: 1px solid #e8edf3;
  background: #f8fafc;
}

.svc-topo-filter {
  padding: 6px 12px;
  border: 1px solid #c5d4ea;
  border-radius: 5px;
  background: #fff;
  color: var(--svc-topo-blue);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.svc-topo-filter:hover {
  background: #ebf3ff;
}

.svc-topo-filter.is-active {
  background: var(--svc-topo-blue);
  border-color: var(--svc-topo-blue);
  color: #fff;
}

.svc-topo-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.svc-topo-nav__group {
  margin-bottom: 8px;
}

.svc-topo-nav__group-title {
  margin: 0;
  padding: 8px 10px 6px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #778;
  text-transform: uppercase;
}

.svc-topo-nav__item {
  display: block;
  width: 100%;
  padding: 10px 12px;
  border: 1px solid transparent;
  border-radius: 5px;
  background: transparent;
  color: #334;
  font-size: 14px;
  line-height: 1.4;
  text-align: left;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.svc-topo-nav__item:hover {
  background: #f4f7fb;
  border-color: #e1e8f0;
}

.svc-topo-nav__item.is-active {
  background: rgba(29, 81, 152, 0.08);
  border-color: rgba(29, 81, 152, 0.25);
  color: var(--svc-topo-blue);
  font-weight: 600;
}

.svc-topo-nav__empty {
  margin: 0;
  padding: 24px 16px;
  font-size: 14px;
  color: #778;
  text-align: center;
}

/* —— Preview —— */
.svc-topo-preview {
  border: 1px solid var(--svc-topo-border);
  border-radius: 5px;
  background: #fff;
  overflow: hidden;
}

.svc-topo-preview__toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid #e8edf3;
  background: #f8fafc;
}

.svc-topo-preview__badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 5px;
  background: rgba(29, 81, 152, 0.1);
  color: var(--svc-topo-blue);
  font-size: 12px;
  font-weight: 600;
}

.svc-topo-preview__nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.svc-topo-preview__btn {
  width: 36px;
  height: 36px;
  border: 1px solid #c5d4ea;
  border-radius: 5px;
  background: #fff;
  color: var(--svc-topo-blue);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s;
}

.svc-topo-preview__btn:hover:not(:disabled) {
  background: #ebf3ff;
  border-color: var(--svc-topo-blue);
}

.svc-topo-preview__btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.svc-topo-preview__index {
  min-width: 4.5em;
  font-size: 13px;
  color: #667;
  text-align: center;
}

.svc-topo-preview__stage {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: none;
  border-bottom: 1px solid rgba(29, 81, 152, 0.15);
  background: #fff;
  cursor: zoom-in;
  line-height: 0;
}

.svc-topo-preview__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}

.svc-topo-preview__zoom {
  position: absolute;
  right: 14px;
  bottom: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 5px;
  background: rgba(15, 39, 68, 0.78);
  color: #fff;
  font-size: 13px;
  pointer-events: none;
}

.svc-topo-preview__body {
  padding: 20px 22px 22px;
}

.svc-topo-preview__title {
  margin: 0 0 10px;
  font-size: 22px;
  color: #0f2744;
}

.svc-topo-preview__desc {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.75;
  color: #556;
}

.svc-topo-preview__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.svc-topo-preview__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: 5px;
  border: 1px solid #c5d4ea;
  background: #fff;
  color: var(--svc-topo-blue);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.svc-topo-preview__cta:hover {
  background: #ebf3ff;
  border-color: var(--svc-topo-blue);
}

.svc-topo-preview__cta--primary {
  background: var(--svc-topo-blue);
  border-color: var(--svc-topo-blue);
  color: #fff;
}

.svc-topo-preview__cta--primary:hover {
  background: #164078;
  border-color: #164078;
  color: #fff;
}

/* —— Browse grid —— */
.svc-topo-section-title {
  margin: 0 0 20px;
  font-size: 22px;
  font-weight: 700;
  color: #1a1a1a;
  padding-left: 14px;
  border-left: 4px solid var(--svc-topo-blue);
}

.svc-topo-browse {
  margin-bottom: 40px;
}

.svc-topo-browse__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.svc-topo-browse__block {
  border: 1px solid #e1e5ea;
  border-radius: 5px;
  background: #fff;
  overflow: hidden;
}

.svc-topo-browse__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid #e8edf3;
  background: #f8fafc;
}

.svc-topo-browse__head h3 {
  margin: 0;
  font-size: 16px;
  color: #0f2744;
}

.svc-topo-browse__head a {
  font-size: 13px;
  font-weight: 600;
  color: var(--svc-topo-orange);
  text-decoration: none;
  white-space: nowrap;
}

.svc-topo-browse__track {
  display: flex;
  gap: 12px;
  padding: 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.svc-topo-browse__card {
  flex: 0 0 auto;
  width: 168px;
  padding: 0;
  border: 1px solid rgba(29, 81, 152, 0.28);
  border-radius: 5px;
  overflow: hidden;
  background: #fff;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.2s, transform 0.2s;
  scroll-snap-align: start;
}

.svc-topo-browse__card:hover {
  border-color: rgba(29, 81, 152, 0.5);
  transform: translateY(-2px);
}

.svc-topo-browse__card.is-active {
  border-color: var(--svc-topo-orange);
  box-shadow: 0 0 0 1px rgba(224, 90, 0, 0.25);
}

.svc-topo-browse__card-media {
  display: block;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: #eef2f7;
  border-bottom: 1px solid rgba(29, 81, 152, 0.2);
}

.svc-topo-browse__card-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.svc-topo-browse__card-label {
  display: block;
  padding: 8px 8px;
  font-size: 13px;
  line-height: 1.35;
  color: #334;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  background: #f8fafc;
  border-top: 1px solid rgba(29, 81, 152, 0.12);
}

/* —— Related —— */
.svc-topo-related {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 36px;
}

.svc-topo-related__card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  border: 1px solid #e1e5ea;
  border-radius: 5px;
  background: #fff;
  text-decoration: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.svc-topo-related__card:hover {
  border-color: var(--svc-topo-blue);
  box-shadow: 0 6px 20px rgba(15, 58, 114, 0.1);
}

.svc-topo-related__card i {
  font-size: 26px;
  color: var(--svc-topo-blue);
}

.svc-topo-related__card strong {
  font-size: 15px;
  color: #1a1a1a;
}

.svc-topo-related__card span {
  font-size: 13px;
  line-height: 1.5;
  color: #667;
}

/* —— Footnote —— */
.svc-topo-footnote {
  padding: 20px 22px;
  border-radius: 5px;
  background: #f4f7fb;
  border: 1px solid #dce4ee;
}

.svc-topo-footnote p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #556;
}

.svc-topo-footnote a {
  font-weight: 600;
  color: var(--svc-topo-blue);
}

/* —— Lightbox —— */
.svc-topo-lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000000010;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.svc-topo-lightbox[hidden] {
  display: none;
}

.svc-topo-lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 39, 68, 0.88);
}

.svc-topo-lightbox__dialog {
  position: relative;
  z-index: 1;
  width: min(100%, 1200px);
  max-height: calc(100vh - 48px);
  display: flex;
  flex-direction: column;
}

.svc-topo-lightbox__close {
  position: absolute;
  top: -44px;
  right: 0;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 24px;
  cursor: pointer;
}

.svc-topo-lightbox__figure {
  margin: 0;
  overflow: auto;
  border-radius: 5px;
  background: #fff;
}

.svc-topo-lightbox__img {
  display: block;
  width: 100%;
  height: auto;
}

.svc-topo-lightbox__caption {
  padding: 12px 16px;
  font-size: 14px;
  color: #334;
  text-align: center;
  background: #f8fafc;
  border-top: 1px solid #e8edf3;
}

@media (max-width: 991px) {
  .svc-topo-hero {
    grid-template-columns: 1fr;
  }

  .svc-topo-layout {
    grid-template-columns: 1fr;
  }

  .svc-topo-sidebar {
    position: static;
    max-height: none;
  }

  .svc-topo-nav {
    max-height: 280px;
  }

  .svc-topo-browse__grid {
    grid-template-columns: 1fr;
  }

  .svc-topo-related {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 575px) {
  .svc-topo-hero {
    padding: 20px 18px;
  }

  .svc-topo-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .svc-topo-related {
    grid-template-columns: 1fr;
  }

  .svc-topo-preview__actions {
    flex-direction: column;
  }

  .svc-topo-preview__cta {
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .svc-topo-browse__card,
  .svc-topo-nav__item,
  .svc-topo-preview__btn {
    transition: none;
  }
}