.page-about {
  --about-rule: rgba(139, 154, 147, 0.24);
  --about-rule-soft: rgba(139, 154, 147, 0.13);
  --about-paper-ink: #22322C;
  --about-paper-muted: #4E5F58;
  --about-paper-rule: rgba(10, 31, 25, 0.14);
  --about-teal-deep: #0E7A5C;
  display: block;
  background: var(--ink);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4vw, 48px) 0 clamp(58px, 7.5vw, 100px);
  background:
    radial-gradient(110% 82% at 88% 2%, rgba(70, 240, 190, 0.13), transparent 62%),
    radial-gradient(88% 68% at 4% 98%, rgba(184, 87, 66, 0.13), transparent 58%),
    linear-gradient(174deg, var(--ink) 0%, var(--deep) 100%);
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .about-hero .breadcrumbs {
  margin: 0 0 clamp(26px, 3.4vw, 46px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 4vw, 54px);
  align-items: center;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.025em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero__actions {
  margin-top: clamp(24px, 3vw, 34px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--glass-brd);
}

.page-about .about-hero__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(40px, 5vw, 68px) 0 0;
  padding: clamp(22px, 3vw, 32px) 0 0;
  border-top: 1px solid var(--about-rule-soft);
  display: grid;
  gap: 22px 28px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .about-fact__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(21px, 3.1vw, 31px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 7px;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--stone);
}

/* ---------- 主体画布 ---------- */

.page-about .about-body {
  padding-block: clamp(48px, 6vw, 88px);
  background:
    radial-gradient(80% 40% at 12% 18%, rgba(28, 58, 48, 0.55), transparent 70%),
    linear-gradient(180deg, var(--ink) 0%, #081A15 52%, var(--deep) 100%);
}

.page-about .about-layout {
  display: grid;
  gap: clamp(30px, 4.5vw, 52px);
}

/* ---------- 章节 ---------- */

.page-about .about-section {
  padding-block: clamp(34px, 4.2vw, 58px);
  border-top: 1px solid var(--about-rule-soft);
}

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

.page-about .about-section__title {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.1vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-lede {
  margin: 0 0 20px;
  max-width: 42ch;
  font-size: clamp(18px, 2.1vw, 22px);
  font-weight: 500;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-text {
  margin: 0 0 1.15em;
  max-width: 70ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-text--tight {
  margin-top: 22px;
}

.page-about .about-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-list > li {
  position: relative;
  padding-left: 20px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-list > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.74em;
  width: 9px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 图案容器 ---------- */

.page-about .about-figure {
  margin: clamp(26px, 3.4vw, 38px) 0 0;
  max-width: 100%;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--about-rule-soft);
}

.page-about .about-figure figcaption {
  margin-top: 11px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 米白纸面 ---------- */

.page-about .about-section--paper {
  margin-block: clamp(22px, 3vw, 38px);
  padding: clamp(28px, 4.2vw, 54px);
  border-top: 0;
  border-radius: var(--radius-m);
  background: var(--paper);
  color: var(--about-paper-ink);
  box-shadow: 0 26px 64px -34px rgba(0, 0, 0, 0.7);
}

.page-about .about-section--paper .about-section__title {
  color: var(--deep);
}

.page-about .about-section--paper .about-text,
.page-about .about-section--paper .about-lede {
  color: var(--about-paper-muted);
}

.page-about .about-section--paper .eyebrow {
  color: var(--about-teal-deep);
}

.page-about .about-section--paper .about-figure figcaption {
  color: var(--about-paper-muted);
}

.page-about .about-section--paper .about-figure img {
  border-color: rgba(10, 31, 25, 0.12);
}

/* ---------- 发展历程 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, rgba(14, 122, 92, 0.62), rgba(14, 122, 92, 0.06));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 18px 0 22px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 26px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--about-teal-deep);
  box-shadow: 0 0 0 4px rgba(14, 122, 92, 0.14);
  transform: translateX(-5.5px);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  transform: translateX(-5.5px) scale(1.14);
  box-shadow: 0 0 0 8px rgba(14, 122, 92, 0.16);
}

.page-about .about-timeline__item:not(:last-child) {
  border-bottom: 1px solid var(--about-paper-rule);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--about-teal-deep);
  margin-bottom: 12px;
}

.page-about .about-timeline__item:nth-child(1) .about-timeline__year { font-size: 24px; }
.page-about .about-timeline__item:nth-child(2) .about-timeline__year { font-size: 30px; }
.page-about .about-timeline__item:nth-child(3) .about-timeline__year { font-size: 38px; }
.page-about .about-timeline__item:nth-child(4) .about-timeline__year { font-size: 46px; }

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17.5px;
  line-height: 1.42;
  letter-spacing: -0.01em;
  color: var(--deep);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.74;
  color: var(--about-paper-muted);
}

/* ---------- 团队分工 ---------- */

.page-about .about-roles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .about-roles > li {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-top: 1px solid var(--about-rule-soft);
}

.page-about .about-roles__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-roles__desc {
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.74;
  color: var(--mist);
}

/* ---------- 夜场蓝分区 ---------- */

.page-about .about-section--night {
  margin-block: clamp(22px, 3vw, 38px);
  padding: clamp(28px, 4.2vw, 54px);
  border: 1px solid rgba(70, 240, 190, 0.18);
  border-radius: var(--radius-m);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(70, 240, 190, 0.1), transparent 62%),
    var(--night);
}

.page-about .about-split {
  margin: 26px 0 0;
  display: grid;
  gap: 1px;
  border-top: 1px solid var(--about-rule-soft);
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .about-split__item {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid var(--about-rule-soft);
}

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

.page-about .about-split__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .about-split__v {
  font-size: 16px;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-inline-link {
  margin: 24px 0 0;
}

/* ---------- 两种查看习惯 ---------- */

.page-about .about-paths {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-about .about-path {
  padding: 22px;
  border-radius: var(--radius-m);
  border: 1px solid var(--about-paper-rule);
  background: rgba(10, 31, 25, 0.035);
}

.page-about .about-path__tag {
  display: inline-block;
  margin: 0 0 14px;
  padding: 4px 11px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--about-teal-deep);
  background: rgba(14, 122, 92, 0.13);
}

.page-about .about-path--quick .about-path__tag {
  color: #A8412C;
  background: rgba(184, 87, 66, 0.14);
}

.page-about .about-path__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 21px;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--deep);
}

.page-about .about-path__text {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-paper-muted);
}

.page-about .about-path__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-path__list > li {
  position: relative;
  padding-left: 18px;
  font-size: 14.8px;
  line-height: 1.66;
  color: var(--about-paper-muted);
}

.page-about .about-path__list > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--about-teal-deep);
}

.page-about .about-path--quick .about-path__list > li::before {
  background: var(--clay);
}

.page-about .about-path__link {
  margin: 18px 0 0;
  font-size: 14px;
}

.page-about .about-path__link a {
  color: var(--about-teal-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(14, 122, 92, 0.4);
  padding-bottom: 1px;
}

.page-about .about-path--quick .about-path__link a {
  color: #A8412C;
  border-bottom-color: rgba(168, 65, 44, 0.4);
}

.page-about .about-path__link a:hover,
.page-about .about-path__link a:focus-visible {
  border-bottom-color: currentColor;
}

/* ---------- 侧栏 ---------- */

.page-about .about-aside {
  display: grid;
  gap: 30px;
  align-content: start;
}

.page-about .about-toc {
  padding-top: 18px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-toc .toc__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc .toc-link {
  display: block;
  padding: 7px 0 7px 12px;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--stone);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-toc .toc-link:hover,
.page-about .about-toc .toc-link:focus-visible,
.page-about .about-toc .toc-link.is-active {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

.page-about .about-aside__block {
  padding-top: 18px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-figures {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-about .about-figures > li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-figures__v {
  flex: 0 0 auto;
  min-width: 4.2em;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-figures__k {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--stone);
}

/* ---------- 收尾 ---------- */

.page-about .about-close {
  padding-block: clamp(54px, 7vw, 92px);
  border-top: 1px solid var(--about-rule-soft);
  background:
    radial-gradient(90% 120% at 90% 0%, rgba(255, 138, 61, 0.12), transparent 60%),
    linear-gradient(180deg, var(--deep) 0%, #04101A 100%);
}

.page-about .about-close__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
  align-items: center;
}

.page-about .about-close__title {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-close__text {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-roles > li {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

  .page-about .about-split__item {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .about-paths {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-close__grid {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

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

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .about-timeline {
    padding-left: 44px;
  }

  .page-about .about-timeline__item::before {
    left: -44px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 250px;
    column-gap: clamp(44px, 5.5vw, 80px);
    align-items: start;
  }

  .page-about .about-aside {
    position: sticky;
    top: 104px;
  }
}

@media (max-width: 480px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .page-about .about-timeline__item:nth-child(3) .about-timeline__year { font-size: 32px; }
  .page-about .about-timeline__item:nth-child(4) .about-timeline__year { font-size: 38px; }

  .page-about .about-path {
    padding: 18px;
  }

  .page-about .about-figures__v {
    min-width: 3.4em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-toc .toc-link {
    transition: none;
  }
}
<<<END>>>