.page-products {
  --bt-rail: 288px;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  line-height: 1.7;
}

.page-products h1,
.page-products h2,
.page-products h3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.18;
  margin: 0;
}

.page-products p {
  margin: 0;
}

.page-products .bt-link {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(221, 164, 59, 0.42);
  padding-bottom: 1px;
  transition: border-color 160ms ease, color 160ms ease;
}

.page-products .bt-link:hover,
.page-products .bt-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--amber);
}

.page-products .breadcrumb {
  padding: 20px 0 0;
}

.page-products .breadcrumb__item {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

.page-products .breadcrumb__sep {
  display: inline-block;
  padding: 0 8px;
  color: var(--stone);
  opacity: 0.6;
}

.page-products .breadcrumb__link {
  color: var(--stone);
  text-decoration: none;
}

.page-products .breadcrumb__link:hover {
  color: var(--amber);
}

/* ---------- 首屏框景 ---------- */
.page-products .bt-hero {
  padding: 20px 0 clamp(36px, 6vw, 72px);
}

.page-products .bt-hero__frame {
  position: relative;
  border: 1px solid var(--line-strong);
  padding: clamp(22px, 4vw, 48px);
  background:
    linear-gradient(180deg, rgba(18, 48, 74, 0.62), rgba(11, 27, 43, 0.18));
  box-shadow: var(--shadow-soft);
}

.page-products .bt-hero__frame::before,
.page-products .bt-hero__frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 1px solid var(--amber);
  pointer-events: none;
}

.page-products .bt-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-products .bt-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.page-products .bt-hero__scale {
  position: absolute;
  top: 0;
  left: clamp(22px, 4vw, 48px);
  right: clamp(22px, 4vw, 48px);
  height: 7px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--line-strong) 0 1px,
    transparent 1px 26px
  );
  opacity: 0.75;
  pointer-events: none;
}

.page-products .bt-hero__eyebrow {
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--amber);
  text-transform: uppercase;
}

.page-products .bt-hero__title {
  margin-top: 14px;
  font-size: clamp(29px, 5.4vw, 60px);
  max-width: 20ch;
}

.page-products .bt-hero__lede {
  margin-top: 18px;
  max-width: 46ch;
  font-size: clamp(15px, 1.4vw, 17px);
  color: var(--stone);
}

.page-products .bt-hero .button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-products .bt-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 32px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-products .bt-stat {
  background: var(--ink-900);
  padding: 16px 16px 18px;
}

.page-products .bt-stat__num {
  display: block;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-products .bt-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
}

.page-products .bt-hero__note {
  display: none;
}

/* ---------- 通用章节 ---------- */
.page-products .section {
  padding: clamp(44px, 7vw, 92px) 0;
  border-top: 1px solid var(--line);
}

.page-products .bt-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 3vw, 36px);
}

.page-products .section__label {
  font-size: 12px;
  letter-spacing: 0.26em;
  color: var(--stone);
  margin-bottom: 14px;
}

.page-products .section-num {
  color: var(--amber);
  margin-right: 8px;
}

.page-products .bt-head h2 {
  font-size: clamp(24px, 3.2vw, 38px);
}

.page-products .lede {
  margin-top: 14px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--stone);
}

.page-products .bt-media {
  margin: 0 0 clamp(26px, 4vw, 40px);
}

.page-products .bt-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 服务范围 ---------- */
.page-products .bt-scope__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-products .bt-rail {
  border: 1px solid var(--line);
  padding: 22px 20px;
  background: rgba(18, 48, 74, 0.42);
}

.page-products .bt-rail__label {
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--stone);
}

.page-products .bt-rail__value {
  margin-top: 10px;
  font-size: clamp(44px, 8vw, 68px);
  line-height: 1;
  color: var(--paper);
  letter-spacing: -0.03em;
}

.page-products .bt-rail__note {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

.page-products .bt-legend {
  list-style: none;
  margin: 20px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 11px;
}

.page-products .bt-legend li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--stone);
}

.page-products .bt-regions {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-products .bt-region {
  display: grid;
  gap: 8px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-products .bt-region__group {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
}

.page-products .bt-region__group .mono {
  color: var(--stone);
  font-size: 12px;
  margin-left: 4px;
}

.page-products .bt-region__names {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--stone);
}

.page-products .bt-region__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-products .bt-scope__foot {
  margin-top: 24px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--stone);
  max-width: 62ch;
}

/* ---------- 四类专区横向带 ---------- */
.page-products .bt-zones__scroller {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 20px 0 18px;
  border-top: 1px solid var(--line-strong);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.page-products .bt-zones__scroller::-webkit-scrollbar {
  height: 4px;
}

.page-products .bt-zones__scroller::-webkit-scrollbar-thumb {
  background: var(--line-strong);
}

.page-products .bt-zone {
  scroll-snap-align: start;
  flex: 0 0 min(80vw, 310px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px 24px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-top: 2px solid rgba(221, 164, 59, 0.5);
  box-shadow: var(--shadow-soft);
}

.page-products .bt-zone__index {
  font-size: 13px;
  color: var(--amber);
  letter-spacing: 0.16em;
}

.page-products .bt-zone__name {
  font-size: 20px;
}

.page-products .bt-zone__kicker {
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--stone);
}

.page-products .bt-zone__text {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--paper);
  opacity: 0.86;
}

.page-products .bt-zone__link {
  margin-top: auto;
  padding-top: 12px;
  font-size: 13px;
  color: var(--amber);
  text-decoration: none;
  border-top: 1px solid var(--line);
}

.page-products .bt-zone__link:hover,
.page-products .bt-zone__link:focus-visible {
  color: var(--paper);
}

/* ---------- 版本分支表格 ---------- */
.page-products .bt-table-wrap {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
}

.page-products .bt-table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
}

.page-products .bt-table thead th {
  padding: 14px 16px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--stone);
  background: rgba(18, 48, 74, 0.7);
  border-bottom: 1px solid var(--line-strong);
  white-space: nowrap;
}

.page-products .bt-table tbody th {
  padding: 18px 16px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.page-products .bt-table td {
  padding: 18px 16px;
  color: var(--stone);
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.page-products .bt-table tbody tr:last-child th,
.page-products .bt-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-products .bt-table tbody tr {
  transition: background-color 160ms ease;
}

.page-products .bt-table tbody tr:hover {
  background: rgba(221, 164, 59, 0.07);
}

.page-products .bt-table .mono {
  color: var(--paper);
}

.page-products .bt-table td .tag {
  margin: 2px 6px 2px 0;
}

.page-products .bt-branch__foot {
  display: grid;
  gap: 26px;
  margin-top: 30px;
}

.page-products .bt-branch__note h3 {
  font-size: 19px;
  margin-bottom: 12px;
}

.page-products .bt-branch__note p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--stone);
  margin-bottom: 12px;
  max-width: 60ch;
}

.page-products .bt-branch__note p:last-child {
  margin-bottom: 0;
}

.page-products .bt-media--square {
  max-width: 460px;
  margin: 0;
}

/* ---------- 入口顺序改动 ---------- */
.page-products .bt-shift {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-products .bt-shift__col {
  background: var(--ink-900);
  padding: 24px 20px;
}

.page-products .bt-shift__col--after {
  background: var(--ink-800);
}

.page-products .bt-shift__title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-products .bt-shift__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-products .bt-shift__list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}

.page-products .bt-shift__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 1px;
  background: var(--stone);
}

.page-products .bt-shift__col--after .bt-shift__list li::before {
  background: var(--amber);
}

.page-products .bt-order__foot {
  margin-top: 26px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--stone);
  max-width: 62ch;
}

/* ---------- 三步路径 ---------- */
.page-products .bt-steps__list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: bt-step;
}

.page-products .bt-step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}

.page-products .bt-step:last-child {
  border-bottom: 1px solid var(--line);
}

.page-products .bt-step__num {
  font-size: 22px;
  line-height: 1.2;
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-products .bt-step__body h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.page-products .bt-step__body > p {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--stone);
  max-width: 60ch;
}

.page-products .bt-step__detail {
  margin-top: 16px;
  border-left: 2px solid rgba(221, 164, 59, 0.42);
  padding-left: 14px;
}

.page-products .bt-step__detail summary {
  cursor: pointer;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--amber);
  list-style: none;
}

.page-products .bt-step__detail summary::-webkit-details-marker {
  display: none;
}

.page-products .bt-step__detail summary::after {
  content: " +";
  color: var(--stone);
}

.page-products .bt-step__detail[open] summary::after {
  content: " −";
}

.page-products .bt-step__detail p {
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--stone);
  max-width: 58ch;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-products .bt-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-products .bt-stat {
    padding: 20px 18px 22px;
  }

  .page-products .bt-region {
    grid-template-columns: 110px minmax(0, 1fr) auto;
    align-items: center;
    gap: 20px;
  }

  .page-products .bt-region__tags {
    justify-content: flex-end;
  }

  .page-products .bt-zone {
    flex: 0 0 300px;
  }

  .page-products .bt-branch__foot {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: 36px;
  }

  .page-products .bt-shift {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-products .bt-shift__col {
    padding: 28px 24px;
  }

  .page-products .bt-step {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 24px;
    padding: 30px 0;
  }

  .page-products .bt-step__num {
    font-size: 28px;
  }
}

@media (min-width: 960px) {
  .page-products .bt-hero__frame {
    padding-right: 78px;
  }

  .page-products .bt-hero__note {
    display: block;
    position: absolute;
    top: 50%;
    right: 22px;
    transform: translateY(-50%);
    writing-mode: vertical-rl;
    font-size: 11px;
    letter-spacing: 0.28em;
    color: var(--stone);
    opacity: 0.8;
  }

  .page-products .bt-scope__grid {
    grid-template-columns: var(--bt-rail) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-products .bt-rail {
    position: sticky;
    top: 96px;
  }

  .page-products .bt-zone {
    flex: 0 0 320px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-products .bt-zones__scroller {
    scroll-behavior: auto;
  }

  .page-products .bt-table tbody tr,
  .page-products .bt-link {
    transition: none;
  }
}