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

.page-products .prod-hero {
  display: grid;
  gap: 34px;
  padding-top: clamp(22px, 4vw, 46px);
  padding-bottom: clamp(36px, 6vw, 72px);
}

.page-products .prod-hero-copy h1 {
  margin: 12px 0 0;
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -0.022em;
  color: var(--paper);
}

.page-products .prod-hero-copy .lede {
  margin-top: 18px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mute);
}

.page-products .prod-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-products .prod-hero-stats {
  display: flex;
  flex-wrap: wrap;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--grid);
}

.page-products .prod-hero-stats li {
  flex: 1 1 92px;
  padding: 16px 18px 14px 0;
  border-right: 1px solid var(--grid);
}

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

.page-products .prod-hero-stats strong {
  display: block;
  font-family: var(--mono);
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-products .prod-hero-stats span {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--mute);
}

/* ---------- 三层结构图 ---------- */
.page-products .prod-map {
  position: relative;
  border: 1px solid var(--grid);
  background-image:
    repeating-linear-gradient(0deg, transparent 0 23px, rgba(36, 240, 200, 0.05) 23px 24px),
    repeating-linear-gradient(90deg, transparent 0 23px, rgba(36, 240, 200, 0.05) 23px 24px),
    linear-gradient(180deg, var(--panel-a), var(--ink));
}

.page-products .prod-map-row {
  position: relative;
  padding: 20px 20px 20px 26px;
  border-bottom: 1px solid var(--grid);
}

.page-products .prod-map-row:last-child {
  border-bottom: 0;
}

.page-products .prod-map-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cyan);
}

.page-products .prod-map-row:nth-child(2)::before {
  background: var(--orange);
}

.page-products .prod-map-row:nth-child(3)::before {
  background: var(--violet);
}

.page-products .prod-map-key {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--paper);
}

.page-products .prod-map-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-products .prod-map-tags li {
  padding: 4px 9px;
  border: 1px solid var(--grid);
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--mute);
}

.page-products .prod-map-note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--mute);
}

/* ---------- 侧轨布局 ---------- */
.page-products .with-rail {
  display: grid;
  gap: 26px;
  padding-bottom: 24px;
}

.page-products .rail-title {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mute);
}

.page-products .rail-nav {
  display: flex;
  flex-direction: row;
  gap: 18px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.page-products .rail-link {
  display: block;
  padding: 4px 0;
  white-space: nowrap;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--mute);
  text-decoration: none;
  transition: color var(--step);
}

.page-products .rail-link:hover,
.page-products .rail-link.is-active {
  color: var(--cyan);
}

.page-products .section {
  padding: clamp(34px, 5vw, 62px) 0;
}

.page-products .rail-body > .section:first-child {
  padding-top: 8px;
}

.page-products .rail-body > .section + .section {
  border-top: 1px solid var(--grid);
}

/* ---------- 章节 01 ---------- */
.page-products .prod-split {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

.page-products .prod-media {
  margin: 0;
  border: 1px solid var(--grid);
}

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

.page-products .prod-media--authors,
.page-products .prod-media--plans {
  margin-top: 30px;
}

/* ---------- 章节 02 ---------- */
.page-products .prod-bar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 32px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-products .prod-bar .stat {
  padding: 18px 18px 16px;
  background: var(--ink-2);
}

.page-products .prod-bar .stat-value {
  display: block;
  font-family: var(--mono);
  font-size: clamp(26px, 3.6vw, 36px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-products .prod-bar .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--mute);
}

.page-products .prod-data-grid {
  display: grid;
  gap: 30px;
}

.page-products .prod-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-products .prod-timeline .timeline-item {
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--grid);
}

.page-products .prod-timeline .timeline-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.page-products .prod-timeline .timeline-item p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mute);
}

/* ---------- 章节 03 ---------- */
.page-products .prod-views {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-products .prod-view {
  display: flex;
  flex-direction: column;
  background: var(--ink-2);
  padding-bottom: 26px;
}

.page-products .prod-view .media {
  margin: 0;
  border-bottom: 1px solid var(--grid);
}

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

.page-products .prod-view-body {
  padding: 20px 22px 0;
}

.page-products .prod-view-body h3 {
  margin: 10px 0 0;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-products .prod-view-body p:last-child {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--mute);
}

/* ---------- 章节 04 ---------- */
.page-products .prod-authors {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-products .prod-author {
  padding: 22px 20px 24px;
  background: var(--ink-2);
  border-top: 2px solid var(--cyan);
}

.page-products .prod-author:nth-child(2) {
  border-top-color: var(--orange);
}

.page-products .prod-author:nth-child(3) {
  border-top-color: var(--violet);
}

.page-products .prod-author:nth-child(4) {
  border-top-color: var(--cyan);
}

.page-products .prod-author-idx {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mute);
}

.page-products .prod-author .card-title {
  margin: 12px 0 0;
  font-size: 17px;
  font-weight: 800;
  color: var(--paper);
}

.page-products .prod-author p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--mute);
}

/* ---------- 章节 05 ---------- */
.page-products .prod-plans {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-products .prod-plan {
  position: relative;
  padding: 26px 22px 28px;
  border-left: 2px solid transparent;
  background-image: linear-gradient(180deg, var(--panel-a), var(--ink));
  transition: border-color var(--step), transform var(--step);
}

.page-products .prod-plan:hover {
  border-left-color: var(--cyan);
  transform: translateY(-2px);
}

.page-products .prod-plan.is-active,
.page-products .prod-plan.is-active:hover {
  border-left-color: var(--orange);
}

.page-products .prod-plan .card-title {
  margin: 10px 0 0;
  font-size: 21px;
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-products .prod-plan-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-products .prod-plan-list li {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 0;
  border-top: 1px solid var(--grid);
  font-size: 13.5px;
}

.page-products .prod-plan-list span {
  color: var(--mute);
}

.page-products .prod-plan-list strong {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--paper);
  text-align: right;
}

.page-products .prod-plan-note {
  margin: 16px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mute);
}

.page-products .prod-fee {
  margin-top: 30px;
  padding: 22px 22px 24px;
  border: 1px solid var(--grid);
  border-left: 2px solid var(--amber);
  background: var(--ink-2);
}

.page-products .prod-fee h3 {
  margin: 0;
  font-size: 16.5px;
  font-weight: 800;
  color: var(--paper);
}

.page-products .prod-fee p {
  margin: 10px 0 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.88;
  color: var(--mute);
}

/* ---------- 章节 06 ---------- */
.page-products .prod-timeline--wide .timeline-item {
  padding-left: 0;
}

/* ---------- 章节 07 ---------- */
.page-products .prod-audience {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-products .prod-persona {
  padding: 22px 20px 24px;
  background: var(--ink-2);
}

.page-products .prod-persona .card-title {
  margin: 0;
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper);
}

.page-products .prod-persona p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--mute);
}

.page-products .prod-persona-tag {
  display: inline-block;
  margin-top: 16px;
  padding: 5px 10px;
  border: 1px solid var(--cyan);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-products .prod-closing {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--grid);
}

.page-products .prod-closing p {
  margin: 0;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--mute);
}

.page-products .prod-closing a {
  color: var(--cyan);
  border-bottom: 1px solid var(--grid);
  text-decoration: none;
  transition: border-color var(--step);
}

.page-products .prod-closing a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-products .prod-authors {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-products .prod-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-products .prod-bar {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-products .prod-hero {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }
  .page-products .prod-split {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1fr);
    gap: 38px;
    align-items: start;
  }
  .page-products .prod-data-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }
  .page-products .prod-views {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-products .prod-plans {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-products .with-rail {
    grid-template-columns: 188px minmax(0, 1fr);
    gap: 52px;
  }
  .page-products .rail {
    position: sticky;
    top: 92px;
    align-self: start;
  }
  .page-products .rail-nav {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }
  .page-products .rail-link {
    padding: 9px 0;
    border-top: 1px solid var(--grid);
    white-space: normal;
  }
}

@media (min-width: 1040px) {
  .page-products .prod-authors {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-products .prod-plan,
  .page-products .rail-link,
  .page-products .prod-closing a {
    transition: none;
  }
  .page-products .prod-plan:hover {
    transform: none;
  }
}