.page-products {
  --rail-w: 320px;
  --bar: var(--cyan-500);
}

/* ---------- 首屏 ---------- */
.page-products .prod-hero {
  position: relative;
  padding: 128px 0 48px;
  border-bottom: var(--line);
  overflow: hidden;
}

.page-products .prod-hero::before {
  content: "";
  position: absolute;
  top: -180px;
  right: -140px;
  width: 440px;
  height: 440px;
  background: radial-gradient(circle, rgba(0, 229, 212, .18), transparent 70%);
  pointer-events: none;
}

.page-products .prod-hero h1 {
  margin: 16px 0 0;
  max-width: 16em;
}

.page-products .prod-hero .lead {
  max-width: 36em;
  margin: 22px 0 0;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.8;
  color: var(--mist-300);
}

.page-products .prod-stats {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 0;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-products .prod-stats li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-right: 26px;
  margin-right: 26px;
  border-right: var(--line);
}

.page-products .prod-stats li:last-child {
  border-right: 0;
  margin-right: 0;
  padding-right: 0;
}

.page-products .prod-stats .mono-key {
  font-size: 24px;
  font-weight: 700;
  color: var(--cyan-300);
}

.page-products .prod-stats li > span:last-child {
  font-size: 14px;
  color: var(--mist-300);
}

.page-products .prod-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

/* ---------- 目录骨架：粘性核对栏 + 资料流 ---------- */
.page-products .catalog {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding-top: 48px;
  padding-bottom: 56px;
}

.page-products .prod-rail__card {
  padding: 22px;
  background: var(--ink-800);
}

.page-products .prod-rail__title {
  margin: 12px 0 0;
  font-size: 20px;
  line-height: 1.4;
}

.page-products .check-list {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-products .check-item label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--ink-600);
  background: var(--ink-700);
  cursor: pointer;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-products .check-item label:hover {
  border-color: var(--cyan-500);
}

.page-products .check-item input {
  appearance: none;
  -webkit-appearance: none;
  position: relative;
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  border: 1px solid var(--ink-600);
  background: var(--ink-900);
  cursor: pointer;
}

.page-products .check-item input:checked {
  background: var(--cyan-500);
  border-color: var(--cyan-500);
}

.page-products .check-item input:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border-right: 2px solid var(--ink-900);
  border-bottom: 2px solid var(--ink-900);
  transform: rotate(45deg);
}

.page-products .check-item label:has(input:checked) {
  border-color: var(--cyan-500);
  background: rgba(0, 229, 212, .08);
}

.page-products .check-item__no {
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan-300);
}

.page-products .check-item__txt {
  font-size: 14px;
  line-height: 1.65;
  color: var(--white-100);
}

.page-products .prod-rail__hint {
  margin: 16px 0 18px;
}

.page-products .prod-rail .btn {
  width: 100%;
  justify-content: center;
}

/* ---------- 右侧资料流 ---------- */
.page-products .prod-flow {
  display: grid;
  gap: 68px;
  min-width: 0;
}

.page-products .prod-block,
.page-products .prod-intro {
  min-width: 0;
}

.page-products .prod-intro h2 {
  margin: 12px 0 0;
  font-size: clamp(22px, 2.4vw, 30px);
}

.page-products .prod-intro p {
  max-width: 42em;
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-products .block-head {
  margin-bottom: 26px;
}

.page-products .block-head h2 {
  margin: 10px 0 0;
}

.page-products .block-head .lead {
  max-width: 40em;
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist-300);
}

/* ---------- 图片容器 ---------- */
.page-products .prod-media {
  margin: 0;
  border: var(--line);
  background: var(--ink-700);
  overflow: hidden;
}

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

.page-products .prod-media--banner {
  margin-top: 26px;
}

.page-products .prod-media--wide {
  margin-bottom: 24px;
}

.page-products .prod-media--wide img {
  aspect-ratio: 16 / 9;
}

.page-products .prod-media--tall img {
  aspect-ratio: 12 / 7;
}

/* ---------- 版本卡 ---------- */
.page-products .ver-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-products .ver-card {
  display: flex;
  flex-direction: column;
  border: var(--line);
  background: var(--ink-800);
  transition: transform .25s var(--ease), border-color .25s var(--ease);
}

.page-products .ver-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-500);
}

.page-products .ver-card--light:hover {
  border-color: var(--orange-500);
}

.page-products .ver-card__media {
  aspect-ratio: 3 / 2;
  background: var(--ink-700);
  overflow: hidden;
}

.page-products .ver-card__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-products .ver-card__body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 14px;
  padding: 20px;
}

.page-products .ver-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-products .ver-card h3 {
  margin: 0;
  font-size: 22px;
}

.page-products .ver-spec {
  display: grid;
  gap: 8px;
  margin: 0;
}

.page-products .ver-spec > div {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 10px;
}

.page-products .ver-spec dt {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist-300);
}

.page-products .ver-spec dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--white-100);
}

.page-products .ver-card__body .btn {
  align-self: flex-start;
  margin-top: auto;
}

/* ---------- 产品线卡片 ---------- */
.page-products .line-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}

.page-products .line-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 18px 18px;
  border: var(--line);
  background: var(--ink-800);
  overflow: hidden;
}

.page-products .line-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--bar);
}

.page-products .line-card:nth-child(1) { --bar: var(--cyan-500); }
.page-products .line-card:nth-child(2) { --bar: var(--orange-500); }
.page-products .line-card:nth-child(3) { --bar: var(--cyan-300); }
.page-products .line-card:nth-child(4) { --bar: var(--orange-300); }
.page-products .line-card:nth-child(5) { --bar: var(--mist-300); }
.page-products .line-card:nth-child(6) { --bar: var(--paper-200); }

.page-products .line-card__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-products .line-card__count {
  font-size: 13px;
  color: var(--mist-300);
}

.page-products .line-card__count .mono-key {
  font-size: 18px;
  font-weight: 700;
  color: var(--white-100);
}

.page-products .line-card__title {
  margin: 0;
  font-size: 17px;
  line-height: 1.4;
}

.page-products .line-card__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan-300);
}

.page-products .line-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-300);
}

.page-products .disclosure {
  align-self: flex-start;
  margin-top: auto;
  padding: 7px 12px;
  border: 1px solid var(--ink-600);
  background: transparent;
  color: var(--cyan-300);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  cursor: pointer;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-products .disclosure:hover {
  border-color: var(--cyan-500);
  color: var(--cyan-500);
}

.page-products .disclosure__panel {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-300);
}

.page-products .disclosure__panel p {
  margin: 0;
}

/* ---------- 规格表 ---------- */
.page-products .spec-scroll {
  overflow-x: auto;
  border: var(--line);
  background: var(--ink-800);
  -webkit-overflow-scrolling: touch;
}

.page-products .spec-table {
  width: 100%;
  min-width: 700px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-products .spec-table th,
.page-products .spec-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: var(--line);
  white-space: nowrap;
}

.page-products .spec-table th {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--cyan-300);
  background: var(--ink-700);
}

.page-products .spec-table td {
  color: var(--white-100);
}

.page-products .spec-table td:nth-child(3) {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan-300);
}

.page-products .spec-table td:last-child,
.page-products .spec-table th:last-child {
  white-space: normal;
  min-width: 210px;
}

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

.page-products .spec-scroll + .note {
  margin-top: 14px;
}

/* ---------- 步骤 ---------- */
.page-products .steps-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

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

.page-products .step {
  display: flex;
  gap: 16px;
  padding: 18px;
  border: var(--line);
  background: var(--ink-800);
}

.page-products .step__no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-500);
}

.page-products .step h3 {
  margin: 0 0 6px;
  font-size: 18px;
}

.page-products .step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist-300);
}

.page-products .step__link {
  display: inline-block;
  margin-top: 8px;
  font-size: 14px;
  color: var(--cyan-300);
}

.page-products .tip-box {
  margin-top: 22px;
  padding: 18px 20px;
  border: 1px solid var(--orange-500);
  background: rgba(255, 138, 61, .08);
}

.page-products .tip-box h3 {
  margin: 0 0 10px;
  font-size: 16px;
  color: var(--orange-300);
}

.page-products .tip-box ul {
  margin: 0;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--white-100);
}

.page-products .copy-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
}

.page-products .copy-row .note {
  margin: 0;
}

/* ---------- 变更索引 ---------- */
.page-products .change-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.page-products .change-card {
  display: block;
  padding: 20px 18px;
  border: var(--line);
  background: var(--ink-800);
  text-decoration: none;
  transition: transform .25s var(--ease), border-color .25s var(--ease);
}

.page-products .change-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-500);
}

.page-products .change-card h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  color: var(--white-100);
}

.page-products .change-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-300);
}

/* ---------- 页尾行动区 ---------- */
.page-products .prod-cta-wrap {
  padding-bottom: 96px;
}

.page-products .prod-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 30px 24px;
  border: 1px solid var(--ink-600);
  background: linear-gradient(135deg, var(--ink-800), var(--ink-900));
}

.page-products .prod-cta h2 {
  margin: 0;
  font-size: clamp(20px, 2.2vw, 26px);
}

.page-products .prod-cta p {
  max-width: 46em;
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-products .prod-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 560px) {
  .page-products .prod-hero {
    padding-top: 108px;
  }

  .page-products .prod-stats {
    flex-direction: column;
    gap: 10px;
  }

  .page-products .prod-stats li {
    border-right: 0;
    margin-right: 0;
    padding-right: 0;
  }

  .page-products .prod-flow {
    gap: 52px;
  }

  .page-products .ver-spec > div {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .page-products .step {
    gap: 12px;
    padding: 16px;
  }
}

@media (min-width: 720px) {
  .page-products .ver-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-products .steps-layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1040px) {
  .page-products .catalog {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: 48px;
    padding-top: 60px;
  }

  .page-products .prod-rail {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-products .prod-rail__card {
    padding: 24px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-products .ver-card,
  .page-products .change-card,
  .page-products .disclosure,
  .page-products .check-item label {
    transition: none;
  }

  .page-products .ver-card:hover,
  .page-products .change-card:hover {
    transform: none;
  }
}