.page-about {
  --ab-idx-w: 208px;
  --ab-gap: clamp(30px, 4vw, 60px);
}

.page-about .about-wrap {
  padding-block: clamp(18px, 3vw, 36px) clamp(64px, 9vw, 120px);
}

.page-about .about-crumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(26px, 4vw, 46px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__idx {
  margin: 0;
  color: var(--lime);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-cond);
  font-weight: 300;
  font-size: clamp(32px, 6.6vw, 78px);
  line-height: 1.08;
  letter-spacing: 0.015em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding: clamp(18px, 2.4vw, 26px) 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
}

.page-about .about-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--lime);
}

.page-about .about-facts__cap {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--mist);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  padding-top: clamp(24px, 3vw, 40px);
}

.page-about .about-side {
  margin-bottom: clamp(20px, 3vw, 0px);
}

.page-about .about-side__cap {
  display: none;
  margin: 0 0 12px;
  color: var(--mist);
}

.page-about .about-side__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-side__list > li {
  flex: 0 0 auto;
}

.page-about .about-side__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--mist);
  font-size: 13px;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-side__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--aqua);
}

.page-about .about-side__link:hover,
.page-about .about-side__link:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
  background: rgba(198, 255, 74, 0.08);
}

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

.page-about .about-side__link:hover .about-side__idx {
  color: var(--lime);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: clamp(28px, 4.4vw, 56px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-sec__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--lime);
}

.page-about .about-sec__title {
  margin: 8px 0 0;
  font-family: var(--font-cond);
  font-weight: 300;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-sec__body {
  margin-top: clamp(16px, 2vw, 24px);
}

.page-about .about-sec p {
  max-width: 34em;
  margin: 0 0 1.05em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

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

/* ---------- 统计条 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-stats > li {
  background: var(--ink-700);
  padding: 18px 16px;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1;
  color: var(--aqua);
}

.page-about .about-stats__cap {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--mist);
}

/* ---------- 分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(16px, 2.4vw, 26px);
  align-items: start;
}

.page-about .about-split__main > p:first-child {
  margin-top: 0;
}

.page-about .about-split__main p {
  max-width: 34em;
  margin: 0 0 1.05em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-figure {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-700);
}

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

/* ---------- 职能列表 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-roles > li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 15px 16px;
  border-radius: var(--radius-m);
  background: var(--ink-700);
  border: 1px solid transparent;
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-roles > li:hover {
  border-color: var(--line);
  transform: translateY(-2px);
}

.page-about .about-roles__dot {
  width: 8px;
  height: 8px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--lime);
}

.page-about .about-roles h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-roles p {
  max-width: none;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 流程图 ---------- */
.page-about .about-flowchart {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--ink-800);
  overflow-x: auto;
}

.page-about .about-flowchart svg {
  display: block;
  width: 100%;
  min-width: 540px;
  height: auto;
}

/* ---------- 引述 ---------- */
.page-about .about-quote {
  margin: clamp(32px, 5vw, 58px) 0;
  padding: clamp(24px, 4vw, 44px) clamp(20px, 4vw, 48px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background:
    radial-gradient(130% 150% at 0% 0%, rgba(198, 255, 74, 0.13), transparent 58%),
    linear-gradient(135deg, var(--ink-800), var(--ink-700) 72%);
}

.page-about .about-quote__text {
  margin: 0;
  max-width: 32em;
  font-family: var(--font-cond);
  font-weight: 300;
  font-size: clamp(20px, 2.9vw, 32px);
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-quote__note {
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-banner {
  margin: 0 0 clamp(22px, 3vw, 34px);
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 38px;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--aqua) 34%, var(--line) 78%, transparent 100%);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(20px, 2.6vw, 28px);
  border-radius: var(--radius-s);
  transition: transform 0.22s var(--ease);
}

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

.page-about .tl__item:hover,
.page-about .tl__item:focus-within {
  transform: translateX(3px);
}

.page-about .tl__item:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 6px;
}

.page-about .tl__dot {
  position: absolute;
  left: -38px;
  top: 4px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--ink-900);
  display: grid;
  place-items: center;
  transition: border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-about .tl__dot::after {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime);
}

.page-about .tl__item:hover .tl__dot,
.page-about .tl__item:focus-within .tl__dot {
  border-color: var(--lime);
  box-shadow: 0 0 0 4px rgba(198, 255, 74, 0.12);
}

.page-about .tl__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .tl__title {
  margin: 8px 0 5px;
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .tl__desc {
  margin: 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 节奏表 ---------- */
.page-about .rhythm-wrap {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow-x: auto;
}

.page-about .rhythm {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .rhythm th {
  text-align: left;
  padding: 12px 14px;
  background: var(--ink-800);
  border-bottom: 1px solid var(--line);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .rhythm td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
  line-height: 1.65;
  color: var(--mist);
  vertical-align: top;
}

.page-about .rhythm td:first-child {
  color: var(--paper);
  font-weight: 500;
  white-space: nowrap;
}

.page-about .rhythm tbody tr:nth-child(even) {
  background: rgba(18, 48, 57, 0.45);
}

.page-about .rhythm tbody tr:hover {
  background: rgba(30, 74, 82, 0.5);
}

.page-about .rhythm tbody tr:last-child td {
  border-bottom: 0;
}

/* ---------- 联系方式 ---------- */
.page-about .about-contact {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-contact__key {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-contact__val {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-contact__val--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .about-contact__note {
  margin: clamp(18px, 2.4vw, 24px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 后续查阅 ---------- */
.page-about .about-next {
  margin-top: clamp(40px, 6vw, 72px);
}

.page-about .about-next__cap {
  margin: 0 0 10px;
  color: var(--mist);
}

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

.page-about .about-next__list > li {
  border-bottom: 1px solid var(--line);
}

.page-about .about-next__link {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 18px;
  padding: 16px 6px;
  text-decoration: none;
  color: var(--paper);
  transition: color 0.22s var(--ease), padding-left 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-next__title {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.page-about .about-next__desc {
  font-size: 14px;
  color: var(--mist);
  transition: color 0.22s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  color: var(--lime);
  padding-left: 14px;
  background: rgba(198, 255, 74, 0.06);
}

.page-about .about-next__link:hover .about-next__desc,
.page-about .about-next__link:focus-visible .about-next__desc {
  color: var(--aqua);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-sec p,
  .page-about .about-split__main p {
    font-size: 17px;
  }
}

@media (min-width: 820px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .about-split--rev {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  }

  .page-about .about-split--rev .about-split__media {
    order: -1;
  }
}

@media (min-width: 860px) {
  .page-about .about-quote {
    display: grid;
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 0.5fr);
    gap: clamp(24px, 3vw, 40px);
    align-items: end;
  }

  .page-about .about-quote__note {
    margin: 0;
    text-align: right;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--ab-idx-w) minmax(0, 1fr);
    gap: var(--ab-gap);
    align-items: start;
    padding-top: clamp(30px, 4vw, 52px);
  }

  .page-about .about-side {
    position: sticky;
    top: calc(var(--strip-h) + 22px);
    margin-bottom: 0;
  }

  .page-about .about-side__cap {
    display: block;
  }

  .page-about .about-side__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-side__link {
    display: flex;
    align-items: baseline;
    width: 100%;
    padding: 9px 12px;
    border-radius: 0 12px 12px 0;
    border: 0;
    border-left: 1px solid var(--line);
    white-space: normal;
    transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
  }

  .page-about .about-side__link:hover,
  .page-about .about-side__link:focus-visible {
    border-left-color: var(--lime);
    background: rgba(198, 255, 74, 0.06);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-roles > li,
  .page-about .tl__item,
  .page-about .about-next__link,
  .page-about .about-side__link {
    transition: none;
  }

  .page-about .about-roles > li:hover,
  .page-about .tl__item:hover,
  .page-about .tl__item:focus-within {
    transform: none;
  }

  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    padding-left: 6px;
  }
}
<<<END>>>