.page-about {
  --about-line: rgba(21, 19, 15, 0.16);
  --about-line-strong: rgba(21, 19, 15, 0.42);
  --about-body: #2E2B23;
  --about-muted: #6B6A5F;
  --about-link: #0E6E62;
  --about-lead: #C3D2CB;
  display: block;
  background: var(--paper);
  color: var(--paper-ink);
}

/* ---------- 顶部深色横带 ---------- */

.page-about .about-band {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--text);
}

.page-about .about-band__media {
  position: absolute;
  inset: 0;
  margin: 0;
}

.page-about .about-band__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
  opacity: 0.34;
}

.page-about .about-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 31, 26, 0.68) 0%, rgba(11, 31, 26, 0.94) 100%);
}

.page-about .about-band__body {
  position: relative;
  z-index: 1;
  padding: 28px 0 36px;
}

.page-about .about-band .hth-breadcrumb__link,
.page-about .about-band .hth-breadcrumb__item {
  color: var(--muted);
}

.page-about .about-band .hth-breadcrumb__link:hover {
  color: var(--cyan);
}

.page-about .about-band__eyebrow {
  margin: 18px 0 0;
  font-family: var(--font-num);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-band__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 7vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .about-band__lead {
  margin: 16px 0 0;
  max-width: 42ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-lead);
}

/* ---------- 进度轴 ---------- */

.page-about .about-axis-scroll {
  margin-top: 28px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-axis {
  display: block;
  width: 100%;
  min-width: 700px;
  height: auto;
}

.page-about .about-axis__line {
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-about .about-axis__node circle {
  fill: var(--ink);
  stroke: var(--cyan);
  stroke-width: 1.5;
}

.page-about .about-axis__node--current circle {
  fill: var(--amber);
  stroke: var(--amber);
}

.page-about .about-axis__t1 {
  fill: var(--text);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-anchor: middle;
}

.page-about .about-axis__t2 {
  fill: var(--muted);
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-anchor: middle;
}

/* ---------- 暖纸色阅读区 ---------- */

.page-about .about-read {
  background: var(--paper);
  color: var(--paper-ink);
  padding-bottom: 56px;
}

/* ---------- 章节刻度条 ---------- */

.page-about .about-rail {
  position: sticky;
  top: var(--hh, 64px);
  z-index: 6;
  background: var(--paper);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-rail__inner {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-rail__label {
  flex: none;
  margin: 0;
  padding: 12px 0;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--about-muted);
}

.page-about .about-rail__list {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
  min-width: 0;
  margin: 0;
  padding: 8px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 12px;
  white-space: nowrap;
  font-size: 0.82rem;
  text-decoration: none;
  color: var(--about-muted);
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  transition: color var(--dur-base) var(--ease),
              border-color var(--dur-base) var(--ease),
              background-color var(--dur-base) var(--ease);
}

.page-about .about-rail__link:hover {
  color: var(--paper-ink);
  border-color: var(--about-line-strong);
  background: rgba(21, 19, 15, 0.05);
}

.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--about-link);
  outline-offset: 2px;
}

.page-about .about-rail__n {
  font-size: 0.72rem;
  color: #8A8574;
}

/* ---------- 纵向时间轴 ---------- */

.page-about .about-track {
  position: relative;
  padding: 36px 0 8px;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 44px;
  bottom: 48px;
  width: 1px;
  background: var(--about-line);
}

.page-about .about-stage {
  position: relative;
  padding: 0 0 52px 28px;
  scroll-margin-top: calc(var(--hh, 64px) + 80px);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 2.5px;
  top: 6px;
  width: 6px;
  height: 6px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--about-line-strong);
}

.page-about .about-stage--current::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(63, 217, 194, 0.22);
}

.page-about .about-stage__scale {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .about-stage__index {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  color: var(--about-line-strong);
}

.page-about .about-stage__range {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
  color: var(--about-muted);
}

.page-about .about-stage__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--paper-ink);
}

.page-about .about-stage__body p {
  margin: 0 0 14px;
  max-width: 38em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-stage__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-stage__body a {
  color: var(--about-link);
  text-decoration: none;
  border-bottom: 1px solid rgba(14, 110, 98, 0.35);
  transition: border-color var(--dur-base) var(--ease);
}

.page-about .about-stage__body a:hover {
  border-bottom-color: var(--about-link);
}

.page-about .about-stage__body a:focus-visible {
  outline: 2px solid var(--about-link);
  outline-offset: 2px;
  border-radius: var(--radius-hard);
}

/* ---------- 字段表 ---------- */

.page-about .about-fields {
  margin: 18px 0 18px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line-strong);
}

.page-about .about-fields li {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 12px;
  min-height: 44px;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
  font-size: 0.9rem;
  line-height: 1.65;
}

.page-about .about-fields__k {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--about-muted);
}

.page-about .about-fields__v {
  color: var(--about-body);
}

/* ---------- 校准步骤 ---------- */

.page-about .about-checks {
  margin: 20px 0 18px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-checks li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  align-items: start;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--about-body);
}

.page-about .about-checks .hth-num {
  font-family: var(--font-num);
  font-size: 0.78rem;
  font-weight: 700;
  text-align: center;
  padding-bottom: 2px;
  color: var(--paper-ink);
  border-bottom: 2px solid var(--amber);
  font-variant-numeric: tabular-nums;
}

/* ---------- 口径提示块 ---------- */

.page-about .about-callout {
  margin: 22px 0 4px;
  max-width: 46em;
  padding: 16px 18px;
  background: var(--ink-soft);
  border-left: 3px solid var(--cyan);
}

.page-about .about-callout__t {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-callout__d {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--about-lead);
}

/* ---------- 字段定义表 ---------- */

.page-about .about-keys {
  margin: 18px 0 18px;
  border-top: 1px solid var(--about-line-strong);
}

.page-about .about-keys__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  min-height: 44px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-keys__k {
  font-family: var(--font-num);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--paper-ink);
}

.page-about .about-keys__v {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--about-body);
}

/* ---------- 说明文字 ---------- */

.page-about .about-note {
  margin: 18px 0 0;
  max-width: 42em;
  font-size: 0.86rem;
  line-height: 1.78;
  color: var(--about-muted);
}

/* ---------- 过渡图带 ---------- */

.page-about .about-slip {
  margin: 0 0 48px 28px;
}

.page-about .about-slip img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 12 / 5;
  object-fit: cover;
}

.page-about .about-slip__cap {
  margin-top: 10px;
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--about-muted);
}

/* ---------- 审校分工双栏 ---------- */

.page-about .about-split {
  display: grid;
  gap: 22px;
}

.page-about .about-split__media {
  margin: 0;
}

.page-about .about-split__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-split__media figcaption {
  margin-top: 8px;
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--about-muted);
}

/* ---------- 下一阶段清单 ---------- */

.page-about .about-next {
  margin: 18px 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line-strong);
}

.page-about .about-next li {
  padding: 16px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-next__t {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  line-height: 1.4;
  color: var(--paper-ink);
}

.page-about .about-next li p:last-child {
  margin: 0;
  max-width: 40em;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--about-body);
}

/* ---------- 桌面端 ---------- */

@media (min-width: 820px) {

  .page-about .about-band__body {
    padding: 48px 0 56px;
  }

  .page-about .about-axis-scroll {
    margin-top: 34px;
  }

  .page-about .about-track {
    padding-top: 48px;
  }

  .page-about .about-track::before {
    left: 5px;
    top: 56px;
  }

  .page-about .about-stage {
    display: grid;
    grid-template-columns: 190px 1fr;
    gap: 44px;
    padding: 0 0 68px 32px;
  }

  .page-about .about-stage::before {
    top: 9px;
  }

  .page-about .about-stage__scale {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 0;
  }

  .page-about .about-stage__range {
    font-size: 0.78rem;
    line-height: 1.7;
  }

  .page-about .about-stage__title {
    margin-bottom: 18px;
  }

  .page-about .about-fields li {
    grid-template-columns: 120px 1fr;
    gap: 20px;
  }

  .page-about .about-slip {
    margin-left: 32px;
    margin-bottom: 60px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 36px;
    align-items: start;
  }

  .page-about .about-rail__label {
    padding: 14px 0;
  }

  .page-about .about-rail__list {
    padding: 10px 0;
  }
}

@media (min-width: 1180px) {

  .page-about .about-stage {
    grid-template-columns: 210px 1fr;
    gap: 56px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) 340px;
  }
}
<<<END>>>