.page-glossary {
  --stage-gap: calc(var(--space-8) * 1.5);
}

/* ===== 首屏 ===== */
.page-glossary .hero {
  padding-top: calc(var(--space-8) * 2.2);
  padding-bottom: var(--space-4);
}

.page-glossary .hero__crumbs {
  margin-bottom: var(--space-6);
}

.page-glossary .hero__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-glossary .hero__title {
  margin: var(--space-2) 0 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  overflow-wrap: break-word;
}

.page-glossary .hero__lede {
  margin: var(--space-4) 0 0;
  max-width: 34ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-glossary .hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  padding-top: var(--space-4);
}

.page-glossary .figure-item {
  min-width: 0;
}

.page-glossary .figure-item__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  line-height: 1;
  color: var(--color-ink);
}

.page-glossary .figure-item__unit {
  display: inline-block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-glossary .figure-item__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ===== 横向刻度轴 ===== */
.page-glossary .axis {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4) var(--space-2);
  list-style: none;
  margin: var(--space-8) 0 0;
  padding: 0;
}

.page-glossary .axis__item {
  position: relative;
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-glossary .axis__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--color-primary);
  transform: translateY(-50%);
}

.page-glossary .axis__link {
  display: block;
  text-decoration: none;
  color: var(--color-accent);
}

.page-glossary .axis__link:hover,
.page-glossary .axis__link:focus-visible {
  text-decoration: underline;
  text-underline-offset: 0.3em;
}

.page-glossary .axis__no {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

.page-glossary .axis__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: 1.4;
  color: var(--color-ink);
}

.page-glossary .axis__time {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ===== 首屏图片 ===== */
.page-glossary .hero__media {
  margin: var(--space-8) 0 0;
}

.page-glossary .hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===== 竖向轨道 ===== */
.page-glossary .track {
  position: relative;
  padding-top: var(--space-8);
}

.page-glossary .track::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 8px;
  width: var(--border-thin);
  background: var(--color-line);
  z-index: 0;
}

.page-glossary .stage {
  position: relative;
}

.page-glossary .stage + .stage {
  margin-top: var(--stage-gap);
}

/* 阶段标题 */
.page-glossary .stage__head {
  position: relative;
  z-index: 1;
  list-style: none;
  cursor: pointer;
  background: var(--color-surface);
  padding: var(--space-2) var(--space-6);
  text-align: left;
}

.page-glossary .stage__head::-webkit-details-marker {
  display: none;
}

.page-glossary .stage__head::after {
  content: "＋";
  position: absolute;
  top: var(--space-2);
  right: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-glossary .stage__fold[open] > .stage__head::after {
  content: "－";
}

.page-glossary .stage__no {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-glossary .stage__title {
  margin: var(--space-1) 0 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-glossary .stage:nth-child(2) .stage__title {
  font-size: calc(var(--text-2xl) * 0.88);
}

.page-glossary .stage:nth-child(3) .stage__title {
  font-size: calc(var(--text-2xl) * 0.78);
}

.page-glossary .stage:nth-child(4) .stage__title {
  font-size: calc(var(--text-2xl) * 0.68);
}

.page-glossary .stage__owner {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* 节点 */
.page-glossary .nodes {
  list-style: none;
  margin: var(--space-8) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  row-gap: var(--space-6);
}

.page-glossary .node {
  position: relative;
  padding-left: var(--space-6);
}

.page-glossary .node::after {
  content: "";
  position: absolute;
  top: var(--space-1);
  left: 5px;
  width: 7px;
  height: 7px;
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-primary);
  transition: transform 180ms ease, background-color 180ms ease;
}

.page-glossary .node:hover::after {
  transform: scale(1.7);
  background: var(--color-primary);
}

.page-glossary .node__kicker {
  margin: 0 0 var(--space-2);
}

.page-glossary .stamp {
  display: inline-block;
  padding: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink);
  background: var(--color-highlight);
  white-space: nowrap;
}

.page-glossary .node__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.35;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-glossary .node__body {
  margin: var(--space-2) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
  overflow-wrap: break-word;
}

.page-glossary .node__aside {
  margin: var(--space-3) 0 0;
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-muted);
}

/* 阶段配图 */
.page-glossary .stage__figure {
  position: relative;
  z-index: 1;
  max-width: 360px;
  margin: var(--space-8) auto 0;
  background: var(--color-surface);
  padding: var(--space-4) 0;
}

.page-glossary .stage__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-glossary .stage__figure figcaption {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ===== 收尾 ===== */
.page-glossary .outro {
  margin-top: var(--section-y);
  padding-top: var(--section-y);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-glossary .outro__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  max-width: 22ch;
}

.page-glossary .outro__lede {
  margin: var(--space-3) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-glossary .gloss {
  list-style: none;
  margin: var(--space-8) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-glossary .gloss__item {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3) 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-glossary .gloss__term {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-accent);
  text-decoration: none;
  overflow-wrap: break-word;
}

.page-glossary .gloss__term:hover,
.page-glossary .gloss__term:focus-visible {
  text-decoration: underline;
  text-underline-offset: 0.3em;
}

.page-glossary .gloss__def {
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-soft);
}

.page-glossary .outro__next {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-glossary .outro__next h3 {
  margin: 0 0 var(--space-4);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.35;
  color: var(--color-ink);
}

.page-glossary .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-glossary .next-list li {
  display: grid;
  gap: var(--space-1);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-glossary .next-list a {
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-accent);
  text-decoration: none;
}

.page-glossary .next-list a:hover,
.page-glossary .next-list a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 0.3em;
}

.page-glossary .next-list span {
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

/* ===== 焦点反馈 ===== */
.page-glossary a:focus-visible,
.page-glossary summary:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

/* ===== 桌面端 ===== */
@media (min-width: 720px) {
  .page-glossary .axis {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-2);
  }

  .page-glossary .gloss__item {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: var(--space-4);
    align-items: baseline;
  }

  .page-glossary .next-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-6);
  }
}

@media (min-width: 900px) {
  .page-glossary .hero__top {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-8);
    align-items: end;
  }

  .page-glossary .hero__figures {
    align-self: end;
  }

  .page-glossary .track::before {
    left: 50%;
  }

  .page-glossary .stage__head {
    text-align: center;
    padding: var(--space-3) var(--space-8);
  }

  .page-glossary .stage__head::after {
    right: var(--space-4);
  }

  .page-glossary .nodes {
    grid-template-columns: minmax(0, 1fr) var(--gutter) minmax(0, 1fr);
    column-gap: 0;
    row-gap: var(--space-8);
  }

  .page-glossary .node {
    padding-left: 0;
  }

  .page-glossary .node:nth-child(1) {
    grid-column: 1;
    grid-row: 1;
    padding-right: var(--space-3);
    text-align: right;
  }

  .page-glossary .node:nth-child(2) {
    grid-column: 3;
    grid-row: 1;
    padding-left: var(--space-3);
    text-align: left;
  }

  .page-glossary .node:nth-child(3) {
    grid-column: 1;
    grid-row: 2;
    padding-right: var(--space-3);
    text-align: right;
  }

  .page-glossary .node:nth-child(4) {
    grid-column: 3;
    grid-row: 2;
    padding-left: var(--space-3);
    text-align: left;
  }

  .page-glossary .node::after {
    left: auto;
  }

  .page-glossary .node:nth-child(odd)::after {
    right: calc(-1 * var(--gutter) / 2 - 4px);
  }

  .page-glossary .node:nth-child(even)::after {
    left: calc(-1 * var(--gutter) / 2 - 4px);
    right: auto;
  }

  .page-glossary .node:nth-child(odd) .node__aside {
    padding-left: 0;
    padding-right: var(--space-3);
    border-left: 0;
    border-right: var(--border-thin) solid var(--color-line);
  }

  .page-glossary .stage__figure {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-glossary .node::after {
    transition: none;
  }
}