.page-about {
  --about-hang: 0.72em;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  padding-block: 8px 0;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 40px;
  padding-block: 32px 0;
}

.page-about .about-hero__lead {
  max-width: 62ch;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  line-height: 0.98;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-about .about-hero__brand {
  display: block;
  font-family: var(--font-base);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--c-ink-soft);
  margin-bottom: 14px;
}

.page-about .about-hero__subject {
  display: block;
  font-size: clamp(44px, 11vw, 104px);
  font-weight: 200;
  letter-spacing: -0.02em;
}

.page-about .about-hero__desc {
  margin: 26px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-ink-soft);
}

/* 档案摘要卡 */
.page-about .about-hero__plate {
  position: relative;
  padding: 26px 24px 22px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-card);
  background: linear-gradient(155deg, rgba(13, 20, 40, 0.9), rgba(5, 7, 15, 0.55));
}

.page-about .about-hero__plate::before {
  content: "";
  position: absolute;
  top: 0;
  left: 28px;
  width: 46px;
  height: 2px;
  background: var(--c-cyan);
  border-radius: 2px;
}

.page-about .about-plate {
  margin: 18px 0 0;
  display: grid;
  gap: 2px;
}

.page-about .about-plate__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-plate__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-plate__key {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-ink-soft);
}

.page-about .about-plate__val {
  margin: 0;
  font-size: 15px;
  color: var(--c-ink);
  white-space: nowrap;
}

/* 首屏宽幅图 */
.page-about .about-hero__figure {
  position: relative;
  margin: 44px auto 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--c-line);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.7) contrast(1.05);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(5, 7, 15, 0.05) 30%, rgba(5, 7, 15, 0.94) 100%);
  pointer-events: none;
}

/* ============ 长卷主体 ============ */
.page-about .about-layout {
  display: grid;
  gap: 48px;
  padding-block: 72px 96px;
}

.page-about .about-flow {
  min-width: 0;
}

/* 侧栏编号目录 */
.page-about .about-toc {
  align-self: start;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  border-left: 1px solid var(--c-line);
}

.page-about .about-toc__link {
  display: flex;
  gap: 12px;
  align-items: baseline;
  margin-left: -1px;
  padding: 11px 0 11px 16px;
  border-left: 2px solid transparent;
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-ink-soft);
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-toc__num {
  font-size: 12px;
  color: var(--c-line);
  transition: color 180ms var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--c-cyan);
  border-left-color: var(--c-cyan);
}

.page-about .about-toc__link:hover .about-toc__num,
.page-about .about-toc__link:focus-visible .about-toc__num {
  color: var(--c-cyan);
}

.page-about .about-toc__note {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-ink-soft);
  opacity: 0.8;
}

/* ============ 编号章节 ============ */
.page-about .about-chapter {
  scroll-margin-top: calc(var(--bar-h) + 28px);
  padding-block: 60px;
  border-top: 1px solid var(--c-line);
}

.page-about .about-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-end;
  gap: 18px;
  margin-bottom: 30px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(52px, 12vw, 104px);
  font-weight: 700;
  line-height: 0.78;
  letter-spacing: -0.04em;
  color: var(--c-line);
  transform: translateY(var(--about-hang));
  user-select: none;
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 4.2vw, 38px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.005em;
  color: var(--c-ink);
}

.page-about .about-chapter__body {
  display: grid;
  gap: 28px;
  min-width: 0;
}

.page-about .about-prose {
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-ink-soft);
}

.page-about .about-prose p {
  margin: 0 0 16px;
}

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

.page-about .about-prose a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 224, 207, 0.35);
  transition: border-color 180ms var(--ease);
}

.page-about .about-prose a:hover,
.page-about .about-prose a:focus-visible {
  border-bottom-color: var(--c-cyan);
}

.page-about .about-lead {
  margin: 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--c-ink);
}

/* 展签式注释 */
.page-about .about-plaque {
  border-left: 2px solid var(--c-line);
  padding: 4px 0 4px 18px;
  max-width: 52ch;
}

.page-about .about-plaque--accent {
  border-left-color: var(--c-cyan);
}

.page-about .about-plaque p {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-ink-soft);
}

.page-about .about-plaque__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .about-plaque__list li {
  position: relative;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-ink-soft);
}

.page-about .about-plaque__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 5px;
  height: 1px;
  background: var(--c-ink-soft);
  opacity: 0.7;
}

/* ============ 图片块 ============ */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--c-panel);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.72) contrast(1.05);
}

.page-about .about-figure .media-frame__caption {
  padding: 12px 18px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-ink-soft);
  border-top: 1px solid var(--c-line);
}

/* ============ 区域分组 ============ */
.page-about .about-regions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .about-region {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr) 34px;
  grid-template-areas:
    "name meter total"
    "split split split";
  align-items: center;
  column-gap: 14px;
  row-gap: 7px;
  padding: 10px 12px;
  border-radius: 14px;
  transition: background 200ms var(--ease);
}

.page-about .about-region:hover {
  background: var(--c-panel-soft);
}

.page-about .about-region__name {
  grid-area: name;
  font-size: 14px;
  color: var(--c-ink);
}

.page-about .about-region__meter {
  grid-area: meter;
  display: block;
  height: 7px;
  border-radius: 999px;
  background: var(--c-panel);
  overflow: hidden;
}

.page-about .about-region__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, rgba(63, 224, 207, 0.12), rgba(63, 224, 207, 0.62));
  transition: filter 200ms var(--ease);
}

.page-about .about-region:hover .about-region__fill {
  filter: brightness(1.5);
}

.page-about .about-region__total {
  grid-area: total;
  font-size: 15px;
  text-align: right;
  color: var(--c-ink);
}

.page-about .about-region__split {
  grid-area: split;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--c-ink-soft);
}

.page-about .about-region--east .about-region__fill { width: 100%; }
.page-about .about-region--south .about-region__fill { width: 66.7%; }
.page-about .about-region--north .about-region__fill { width: 66.7%; }
.page-about .about-region--central .about-region__fill { width: 55.6%; }
.page-about .about-region--southwest .about-region__fill { width: 44.4%; }
.page-about .about-region--northwest .about-region__fill { width: 33.3%; }
.page-about .about-region--northeast .about-region__fill { width: 33.3%; }

/* ============ 斜向分隔 ============ */
.page-about .about-slant {
  height: 1px;
  margin-block: 40px;
  background: linear-gradient(90deg, transparent, var(--c-line) 12%, var(--c-line) 78%, transparent);
  transform: rotate(-1.4deg);
  transform-origin: left center;
}

/* ============ 版本时间线 ============ */
.page-about .about-verlist {
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  border-left: 1px solid var(--c-line);
  display: grid;
  gap: 4px;
}

.page-about .about-verlist__item {
  position: relative;
}

.page-about .about-verlist__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 22px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-bg);
  border: 1px solid var(--c-line);
}

.page-about .about-ver {
  border-radius: 16px;
  transition: background 200ms var(--ease);
}

.page-about .about-ver[open] {
  background: var(--c-panel-soft);
}

.page-about .about-ver__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  cursor: pointer;
  border-radius: 16px;
}

.page-about .about-ver__summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

.page-about .about-ver__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--c-ink-soft);
  transition: color 180ms var(--ease);
}

.page-about .about-ver[open] .about-ver__summary::after {
  content: "–";
  color: var(--c-cyan);
}

.page-about .about-ver__name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 300;
  color: var(--c-ink);
}

.page-about .about-ver__meta {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-ink-soft);
}

.page-about .about-ver__body {
  padding: 0 16px 18px 16px;
}

.page-about .about-ver__body p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink-soft);
}

.page-about .about-ver__body a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 224, 207, 0.35);
}

/* ============ 团队条 ============ */
.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  align-items: end;
}

.page-about .about-team__item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.page-about .about-team__role {
  margin: 0;
  font-size: 14px;
  color: var(--c-ink);
}

.page-about .about-team__role .mono {
  font-size: 13px;
  color: var(--c-ink-soft);
}

.page-about .about-team__duty {
  margin: 0;
  font-size: 12px;
  line-height: 1.65;
  color: var(--c-ink-soft);
}

.page-about .about-team__bar {
  display: block;
  width: 100%;
  border-radius: 14px 14px 4px 4px;
  border-top: 2px solid rgba(63, 224, 207, 0.5);
  background: linear-gradient(180deg, rgba(63, 224, 207, 0.34), rgba(63, 224, 207, 0.04));
}

.page-about .about-team__bar--1 { height: 132px; }
.page-about .about-team__bar--2 { height: 70px; }
.page-about .about-team__bar--3 { height: 38px; }

/* ============ 收尾动作 ============ */
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 显现动效 ============ */
.page-about [data-reveal] {
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-about .about-region {
    grid-template-columns: 74px minmax(0, 1fr) 40px 208px;
    grid-template-areas: "name meter total split";
    row-gap: 0;
    padding: 9px 14px;
  }

  .page-about .about-region__split {
    text-align: right;
    font-size: 12px;
  }

  .page-about .about-figure--narrow {
    max-width: 680px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 56px;
    padding-block: 48px 0;
  }

  .page-about .about-hero__figure {
    margin-top: 56px;
  }

  .page-about .about-chapter {
    padding-block: 76px;
  }

  .page-about .about-chapter__head {
    gap: 26px;
    margin-bottom: 36px;
  }

  .page-about .about-chapter__body {
    gap: 34px;
  }

  .page-about .about-slant {
    margin-block: 56px;
  }

  .page-about .about-team__bar--1 { height: 168px; }
  .page-about .about-team__bar--2 { height: 88px; }
  .page-about .about-team__bar--3 { height: 46px; }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
    gap: 72px;
    align-items: start;
    padding-block: 88px 128px;
  }

  .page-about .about-plaque {
    padding-left: 22px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__desc {
    font-size: 17px;
  }

  .page-about .about-prose {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .about-toc__link,
  .page-about .about-region,
  .page-about .about-region__fill,
  .page-about .about-ver {
    transition: none;
  }

  .page-about .about-slant {
    transform: none;
  }

  .page-about .about-region:hover .about-region__fill {
    filter: none;
  }
}
<<<END>>>