.page-about {
  --about-hair: 1px solid var(--line);
  --about-pad: clamp(18px, 3vw, 30px);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: clamp(40px, 8vw, 104px) 0 clamp(30px, 5vw, 62px);
  border-bottom: var(--about-hair);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 84% 8%, rgba(138, 107, 255, 0.20), transparent 58%),
    radial-gradient(circle at 8% 94%, rgba(47, 242, 207, 0.13), transparent 54%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.42;
  background-image: repeating-linear-gradient(
    to right,
    rgba(36, 64, 92, 0.55) 0 1px,
    transparent 1px 88px
  );
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 78%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 78%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  margin: 14px 0 20px;
  max-width: 14em;
  font-family: var(--font-sans);
  font-size: clamp(30px, 5.2vw, 60px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin: 0 0 clamp(28px, 4.5vw, 46px);
  max-width: 40em;
  font-size: clamp(15px, 1.3vw, 18px);
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: var(--about-hair);
}

.page-about .about-fig {
  padding: 15px 16px 17px;
  background: var(--panel);
}

.page-about .about-fig__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-fig__value {
  margin: 7px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--text);
  letter-spacing: -0.01em;
}

.page-about .about-fig__value--cyan {
  color: var(--cyan);
}

.page-about .about-fig__value--orange {
  color: var(--orange);
}

@media (min-width: 760px) {
  .page-about .about-hero__figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-fig {
    padding: 20px 22px 24px;
  }
}

/* ============ 正文骨架 ============ */
.page-about .about-body {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  padding-top: clamp(36px, 6vw, 76px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(40px, 4vw, 68px);
  }
}

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

/* ============ 章节索引 ============ */
.page-about .about-index {
  align-self: start;
  min-width: 0;
}

@media (min-width: 1000px) {
  .page-about .about-index {
    position: sticky;
    top: 132px;
  }
}

.page-about .about-index__title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: var(--about-hair);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

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

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(47, 242, 207, 0.07);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--line);
}

@media (max-width: 999px) {
  .page-about .about-index__title {
    display: none;
  }
  .page-about .about-index__list {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: 4px;
    overflow-x: auto;
    padding-bottom: 10px;
    border-bottom: var(--about-hair);
    scrollbar-width: none;
  }
  .page-about .about-index__list::-webkit-scrollbar {
    display: none;
  }
  .page-about .about-index__link {
    border-left: 0;
    border-bottom: 2px solid transparent;
    padding: 6px 10px 8px;
    white-space: nowrap;
  }
  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: transparent;
    border-bottom-color: var(--cyan);
  }
}

/* ============ 章节 ============ */
.page-about .about-sec {
  scroll-margin-top: 128px;
  padding-top: clamp(30px, 5vw, 58px);
  border-top: var(--about-hair);
  margin-top: clamp(30px, 5vw, 58px);
}

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

.page-about .about-sec__num {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-sec__num::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(to right, var(--line), transparent);
}

.page-about .about-sec__title {
  margin: 0 0 20px;
  max-width: 20em;
  font-size: clamp(21px, 2.5vw, 33px);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-sec__prose {
  max-width: 40em;
}

.page-about .about-sec__prose p + p {
  margin-top: 16px;
}

.page-about .about-pull {
  margin: 30px 0 0;
  padding: 20px 22px;
  background: var(--panel-2);
  border: var(--about-hair);
  border-left: 3px solid var(--orange);
  box-shadow: 7px 7px 0 rgba(5, 15, 28, 0.6);
}

.page-about .about-pull p {
  margin: 0;
  max-width: 30em;
  font-size: clamp(16px, 1.6vw, 20px);
  line-height: 1.72;
  color: var(--text);
}

.page-about .about-note {
  margin: 24px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--violet);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ============ 图片 ============ */
.page-about .about-figure {
  margin: clamp(24px, 4vw, 38px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  background: var(--panel);
  border: var(--about-hair);
  transition: border-color 0.25s ease;
}

.page-about .about-figure:hover img {
  border-color: var(--cyan);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--muted);
}

/* ============ 版本时间轴 ============ */
.page-about .about-timeline {
  position: relative;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), var(--violet) 55%, var(--line));
}

.page-about .tl-node {
  position: relative;
  padding: 0 0 clamp(22px, 3.2vw, 34px) 46px;
  outline: none;
}

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

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--line);
  transition: border-color 0.25s ease, background-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .tl-node:hover::before,
.page-about .tl-node:focus-within::before,
.page-about .tl-node:focus::before {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(47, 242, 207, 0.14);
}

.page-about .tl-node__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .tl-node__ver {
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .tl-node__year {
  padding: 2px 7px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .tl-node__title {
  margin: 9px 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
}

.page-about .tl-node__detail {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  opacity: 0.62;
  transform: translateX(0);
  transition: opacity 0.25s ease, transform 0.25s ease, color 0.25s ease;
}

.page-about .tl-node:hover .tl-node__detail,
.page-about .tl-node:focus-within .tl-node__detail,
.page-about .tl-node:focus .tl-node__detail {
  opacity: 1;
  color: var(--text);
  transform: translateX(4px);
}

/* ============ 团队角色 ============ */
.page-about .about-roles {
  display: grid;
  gap: 12px;
  margin-top: clamp(22px, 3.6vw, 34px);
}

@media (min-width: 700px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .role-card {
  padding: 18px 18px 20px;
  background: var(--panel);
  border: var(--about-hair);
  border-top: 2px solid var(--line);
  transition: border-color 0.22s ease, transform 0.22s ease, box-shadow 0.22s ease;
}

.page-about .role-card:hover {
  border-color: var(--cyan);
  border-top-color: var(--cyan);
  transform: translateY(-4px);
  box-shadow: 8px 10px 0 rgba(5, 15, 28, 0.6);
}

.page-about .role-card__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--line);
}

.page-about .role-card:hover .role-card__num {
  color: var(--cyan);
}

.page-about .role-card__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .role-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ============ 覆盖范围 ============ */
.page-about .about-reach {
  display: grid;
  gap: clamp(22px, 3.6vw, 34px);
  margin-top: 6px;
}

@media (min-width: 860px) {
  .page-about .about-reach {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

.page-about .about-reach__figure {
  padding: var(--about-pad);
  background: var(--panel);
  border: var(--about-hair);
  border-bottom: 3px solid var(--cyan);
}

.page-about .about-reach__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(52px, 8vw, 82px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-reach__unit {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-reach__caption {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: var(--about-hair);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-reach__list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-hair);
}

.page-about .about-reach__list li {
  position: relative;
  padding: 14px 4px 14px 22px;
  border-bottom: var(--about-hair);
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-reach__list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 22px;
  width: 8px;
  height: 1px;
  background: var(--orange);
}

.page-about .about-reach__list a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 242, 207, 0.35);
}

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

/* ============ 产出指标 ============ */
.page-about .about-metrics {
  display: grid;
  gap: 1px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--about-hair);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.page-about .about-metric {
  padding: 16px 16px 18px;
  background: var(--panel);
}

.page-about .about-metric__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--text);
}

.page-about .about-metric__value--orange {
  color: var(--orange);
}

.page-about .about-metric__value small {
  font-size: 0.55em;
  margin-left: 1px;
}

.page-about .about-metric__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

/* ============ 结尾档案卡 ============ */
.page-about .about-dossier {
  margin-top: clamp(38px, 6vw, 68px);
  padding: clamp(20px, 3vw, 34px);
  border-top: 3px solid var(--cyan);
}

.page-about .about-dossier__head {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.page-about .about-dossier__title {
  margin: 0;
  font-size: clamp(19px, 2.1vw, 26px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--text);
}

.page-about .dossier-list {
  margin: 20px 0 0;
  padding: 0;
  border-top: var(--about-hair);
}

.page-about .dossier-row {
  display: grid;
  gap: 3px;
  padding: 12px 0;
  border-bottom: var(--about-hair);
}

@media (min-width: 640px) {
  .page-about .dossier-row {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

.page-about .dossier-row dt {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .dossier-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text);
}

.page-about .about-dossier__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node__detail,
  .page-about .role-card,
  .page-about .about-index__link,
  .page-about .about-figure img {
    transition: none;
  }
  .page-about .tl-node:hover .tl-node__detail,
  .page-about .tl-node:focus-within .tl-node__detail {
    transform: none;
  }
  .page-about .role-card:hover {
    transform: none;
  }
}
<<<END>>>