.page-about {
  --about-gutter: 22px;
  color: var(--text-100);
  padding-bottom: 48px;
}

/* 面包屑 */
.page-about .breadcrumb {
  padding: 18px 0 14px;
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-300);
}
.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}
.page-about .breadcrumb__link {
  color: var(--blue);
  text-decoration: none;
}
.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--magenta);
}

/* 首屏框景 */
.page-about .about-hero {
  position: relative;
  border: 1px solid var(--line-strong);
  background-color: var(--panel-850);
  overflow: hidden;
  isolation: isolate;
}
.page-about .about-hero::before,
.page-about .about-hero::after {
  content: "";
  position: absolute;
  width: 46px;
  height: 46px;
  border: 2px solid var(--magenta);
  opacity: 0.6;
  pointer-events: none;
  z-index: 3;
}
.page-about .about-hero::before {
  top: 0;
  left: 0;
  border-right: 0;
  border-bottom: 0;
}
.page-about .about-hero::after {
  right: 0;
  bottom: 0;
  border-left: 0;
  border-top: 0;
  border-color: var(--blue);
}
.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.3;
}
.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  max-width: 100%;
  height: auto;
  min-height: 100%;
}
.page-about .about-hero__body {
  position: relative;
  z-index: 2;
  padding: 32px var(--about-gutter) 28px;
  background: linear-gradient(180deg, rgba(11, 14, 20, 0.55) 0%, rgba(11, 14, 20, 0.9) 78%);
}
.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}
.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(30px, 7vw, 60px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-100);
  text-shadow: 0 0 26px rgba(255, 46, 138, 0.35);
  max-width: 18em;
}
.page-about .about-hero__lead {
  margin: 0 0 26px;
  font-family: var(--font-editorial);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-300);
  max-width: 44em;
}
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background-color: var(--line-soft);
  border: 1px solid var(--line);
}
.page-about .about-fact {
  background-color: rgba(20, 26, 36, 0.92);
  padding: 14px 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: -0.02em;
}
.page-about .about-fact__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-300);
}

/* 双栏骨架 */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: 40px;
}
.page-about .about-rail {
  border-left: 2px solid var(--line-strong);
  padding-left: 16px;
}
.page-about .about-rail__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--text-300);
}
.page-about .index-nav {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
.page-about .index-nav__item {
  margin: 0;
}
.page-about .index-nav__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 8px 9px 10px;
  text-decoration: none;
  color: var(--text-300);
  border-left: 2px solid transparent;
  margin-left: -18px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background-color 160ms var(--ease);
}
.page-about .index-nav__link:hover,
.page-about .index-nav__link:focus-visible {
  color: var(--text-100);
  background-color: rgba(47, 216, 255, 0.07);
}
.page-about .index-nav__link.is-active,
.page-about .index-nav__link[aria-current="true"] {
  color: var(--text-100);
  border-left-color: var(--magenta);
  background-color: rgba(255, 46, 138, 0.09);
}
.page-about .about-rail__year {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--blue);
  min-width: 3.4em;
}
.page-about .index-nav__link.is-active .about-rail__year {
  color: var(--gold);
}
.page-about .about-rail__text {
  font-size: 14px;
  line-height: 1.5;
}
.page-about .about-rail__note {
  margin: 18px 0 0;
  font-size: 12px;
  line-height: 1.8;
  color: var(--text-300);
  opacity: 0.8;
}

/* 章节 */
.page-about .about-body {
  min-width: 0;
}
.page-about .about-sec {
  padding: 34px 0 38px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 90px;
}
.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 4px;
}
.page-about .about-sec__head {
  margin-bottom: 18px;
}
.page-about .about-sec__num {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--magenta);
}
.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 4.4vw, 32px);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-100);
}
.page-about .about-body p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-300);
}
.page-about .about-body .about-lead {
  font-size: 17px;
  line-height: 1.95;
  color: var(--text-100);
  border-left: 2px solid var(--gold);
  padding-left: 16px;
  margin-bottom: 20px;
}
.page-about .about-sec__tail {
  margin-top: 18px !important;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  color: var(--text-300);
}

/* 时间线 */
.page-about .about-timeline {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-left: 1px solid var(--line-strong);
}
.page-about .about-timeline__row {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0 14px 16px;
  position: relative;
}
.page-about .about-timeline__row::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 22px;
  width: 9px;
  height: 9px;
  background-color: var(--panel-700);
  border: 1px solid var(--line-strong);
  border-radius: 50%;
}
.page-about .about-timeline__row--now::before {
  background-color: var(--magenta);
  border-color: var(--magenta);
  box-shadow: 0 0 12px rgba(255, 46, 138, 0.7);
}
.page-about .about-timeline__year {
  font-size: 13px;
  color: var(--gold);
  padding-top: 2px;
}
.page-about .about-timeline__name {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-100);
}
.page-about .about-timeline__text p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
}

/* 团队卡 */
.page-about .about-team {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}
.page-about .team-card {
  border: 1px solid var(--line-strong);
  background-color: var(--panel-850);
  position: relative;
  padding: 0;
}
.page-about .team-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 34px;
  height: 34px;
  border-top: 2px solid var(--blue);
  border-right: 2px solid var(--blue);
  opacity: 0.5;
  pointer-events: none;
}
.page-about .team-card__summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  font-family: var(--font-display);
}
.page-about .team-card__summary::-webkit-details-marker {
  display: none;
}
.page-about .team-card__summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: -2px;
}
.page-about .team-card__role {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-100);
}
.page-about .team-card__count {
  font-size: 15px;
  color: var(--gold);
  white-space: nowrap;
}
.page-about .team-card__note {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-300);
  border-top: 1px dashed var(--line);
  padding-top: 14px;
}
.page-about .team-card[open] {
  border-color: rgba(255, 46, 138, 0.45);
}
.page-about .team-card[open] .team-card__count {
  color: var(--magenta);
}

/* 图位 */
.page-about .about-figure {
  margin: 26px 0 0;
  border: 1px solid var(--line);
  background-color: var(--panel-700);
}
.page-about .about-figure .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}
.page-about .media-frame--16x9 .media-frame__img {
  aspect-ratio: 16 / 10;
}
.page-about .about-figure .media-frame__cap {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-300);
  border-top: 1px solid var(--line);
}

/* 版本刻度 */
.page-about .about-versions {
  margin-top: 24px;
  padding: 20px 16px 18px;
  background-color: var(--panel-850);
  border: 1px solid var(--line);
}
.page-about .ver-track {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 14px;
}
.page-about .ver-step {
  position: relative;
  padding-top: 18px;
  border-top: 2px solid var(--line-strong);
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.page-about .ver-step::before {
  content: "";
  position: absolute;
  top: -7px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--panel-700);
  border: 2px solid var(--line-strong);
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}
.page-about .ver-step--now {
  border-top-color: var(--magenta);
}
.page-about .ver-step--now::before {
  background-color: var(--magenta);
  border-color: var(--magenta);
  box-shadow: 0 0 12px rgba(255, 46, 138, 0.75);
}
.page-about .ver-step__badge {
  font-size: 13px;
  color: var(--blue);
}
.page-about .ver-step--now .ver-step__badge {
  color: var(--gold);
}
.page-about .ver-step__name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-100);
}
.page-about .ver-step__note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-300);
  transition: color 180ms var(--ease);
}
.page-about .ver-step:hover .ver-step__note,
.page-about .ver-step:focus-within .ver-step__note {
  color: var(--text-100);
}

/* 玩法色标 */
.page-about .color-grid {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.page-about .color-chip {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: 4px 10px;
  padding: 13px 12px;
  background-color: var(--panel-850);
  border: 1px solid var(--line);
  border-left-width: 4px;
}
.page-about .color-chip__swatch {
  grid-row: span 2;
  width: 12px;
  height: 100%;
  min-height: 34px;
  align-self: stretch;
}
.page-about .color-chip__name {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-100);
}
.page-about .color-chip__use {
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-300);
}
.page-about .color-chip--magenta { border-left-color: var(--magenta); }
.page-about .color-chip--magenta .color-chip__swatch { background-color: var(--magenta); }
.page-about .color-chip--blue { border-left-color: var(--blue); }
.page-about .color-chip--blue .color-chip__swatch { background-color: var(--blue); }
.page-about .color-chip--gold { border-left-color: var(--gold); }
.page-about .color-chip--gold .color-chip__swatch { background-color: var(--gold); }
.page-about .color-chip--mist { border-left-color: var(--mist-300); }
.page-about .color-chip--mist .color-chip__swatch { background-color: var(--mist-300); }
.page-about .color-chip--orange { border-left-color: var(--orange); }
.page-about .color-chip--orange .color-chip__swatch { background-color: var(--orange); }
.page-about .color-chip--success { border-left-color: var(--success); }
.page-about .color-chip--success .color-chip__swatch { background-color: var(--success); }

/* 服务能力 */
.page-about .service-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 22px;
  background-color: var(--line);
  border: 1px solid var(--line);
}
.page-about .service-item {
  background-color: var(--panel-850);
  padding: 18px 16px;
}
.page-about .service-item__num {
  margin: 0 0 8px !important;
  font-size: 20px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: -0.01em;
}
.page-about .service-item__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-100);
}
.page-about .service-item__text {
  margin: 0 !important;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-300);
}

/* 合作带 */
.page-about .eco-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 24px;
  background-color: var(--line);
  border: 1px solid var(--line-strong);
}
.page-about .eco-band__item {
  background-color: var(--panel-700);
  padding: 18px 16px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.page-about .eco-band__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--blue);
  line-height: 1;
}
.page-about .eco-band__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-300);
}

/* 收束区 */
.page-about .about-close {
  margin-top: 10px;
  padding: 28px 20px;
  border: 1px solid rgba(255, 46, 138, 0.4);
  background:
    linear-gradient(135deg, rgba(255, 46, 138, 0.12) 0%, rgba(11, 14, 20, 0) 55%),
    var(--panel-850);
  position: relative;
  overflow: hidden;
}
.page-about .about-close::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--magenta), var(--blue), var(--gold));
}
.page-about .about-close__tag {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}
.page-about .about-close__title {
  margin: 0 0 14px;
  font-family: var(--font-editorial);
  font-size: clamp(22px, 5vw, 34px);
  line-height: 1.35;
  font-weight: 700;
  color: var(--text-100);
}
.page-about .about-close__text {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-300);
  max-width: 42em;
}
.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-close__actions .btn {
  text-decoration: none;
}

/* 平板及以上 */
@media (min-width: 720px) {
  .page-about {
    --about-gutter: 40px;
  }
  .page-about .about-hero__body {
    padding: 46px 40px 36px;
  }
  .page-about .about-facts {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ver-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .color-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .service-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .eco-band {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-close {
    padding: 38px 34px;
  }
}

/* 桌面：左侧刻度栏 + 右侧长文 */
@media (min-width: 980px) {
  .page-about .about-shell {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 52px;
    margin-top: 56px;
  }
  .page-about .about-rail {
    position: sticky;
    top: 88px;
    align-self: start;
    padding-left: 18px;
  }
  .page-about .about-sec {
    padding: 44px 0 48px;
    scroll-margin-top: 100px;
  }
  .page-about .about-sec__head {
    display: grid;
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
    margin-bottom: 22px;
  }
  .page-about .about-sec__num {
    margin: 8px 0 0;
    text-align: right;
    padding-right: 14px;
    border-right: 1px solid var(--line-strong);
  }
  .page-about .about-body p {
    font-size: 16px;
    max-width: 40em;
  }
  .page-about .about-body .about-lead {
    font-size: 19px;
    padding-left: 22px;
    max-width: 34em;
  }
  .page-about .service-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-timeline {
    max-width: 640px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .index-nav__link,
  .page-about .ver-step::before,
  .page-about .ver-step__note {
    transition: none;
  }
  .page-about .about-hero__title {
    text-shadow: none;
  }
}
<<<END>>>