.page-about {
  --about-rail-w: 244px;
  --about-line: rgba(7, 26, 43, 0.14);
  --about-line-soft: rgba(7, 26, 43, 0.08);
  --about-ink-soft: rgba(7, 16, 24, 0.76);
  background: var(--sj-sand-050);
  color: var(--sj-ink);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--sj-sans);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  color: var(--sj-on-dark);
  padding: clamp(22px, 4vw, 40px) 0 clamp(40px, 6vw, 84px);
  border-bottom: 1px solid var(--sj-line);
  background:
    radial-gradient(130% 110% at 88% -10%, rgba(18, 57, 92, 0.92) 0%, rgba(11, 36, 64, 0.97) 46%, var(--sj-navy-950) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(90deg, rgba(217, 164, 65, 0.07) 1px, transparent 1px);
  background-size: 72px 100%;
}

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

.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 52px);
  padding: 0;
  font-family: var(--sj-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--sj-mist);
}

.page-about .about-crumb li {
  display: flex;
  align-items: center;
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin: 0 9px;
  color: rgba(175, 192, 204, 0.45);
}

.page-about .about-crumb a {
  color: var(--sj-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--sj-ease), border-color 0.2s var(--sj-ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--sj-gold-300);
  border-bottom-color: var(--sj-gold-300);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-eyebrow {
  margin: 0 0 14px;
  font-family: var(--sj-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--sj-gold-300);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-size: clamp(34px, 6.2vw, 72px);
  line-height: 1.05;
  font-weight: 300;
  letter-spacing: -0.032em;
  color: var(--sj-sand-050);
  max-width: 13em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 1.5vw, 17.5px);
  line-height: 1.9;
  color: var(--sj-on-dark-soft);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--sj-line-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  color: var(--sj-mist);
}

.page-about .about-hero__fact-num {
  font-family: var(--sj-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--sj-gold-300);
}

.page-about .about-hero__figure {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--sj-line);
  background: rgba(4, 18, 31, 0.5);
}

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

.page-about .about-hero__figure figcaption {
  margin-top: 10px;
  font-family: var(--sj-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--sj-mist);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  padding-top: clamp(32px, 5vw, 64px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-rail {
  border-bottom: 1px solid var(--about-line);
  padding-bottom: 14px;
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--sj-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: rgba(7, 26, 43, 0.45);
}

.page-about .about-toc {
  display: flex;
  flex-wrap: nowrap;
  gap: 4px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.page-about .sj-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex: none;
  padding: 9px 12px;
  white-space: nowrap;
  font-size: 13px;
  color: rgba(7, 16, 24, 0.72);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color 0.2s var(--sj-ease), border-color 0.2s var(--sj-ease), background 0.2s var(--sj-ease);
}

.page-about .sj-toc__link:hover,
.page-about .sj-toc__link:focus-visible {
  border-color: var(--sj-gold-500);
  color: var(--sj-navy-950);
}

.page-about .sj-toc__index {
  font-family: var(--sj-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--sj-gold-500);
}

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

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: clamp(34px, 5vw, 76px) 0;
  border-top: 1px solid var(--about-line);
}

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

.page-about .about-sec__idx {
  margin: 0 0 10px;
  font-family: var(--sj-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--sj-gold-500);
}

.page-about .about-sec__title {
  margin: 0 0 18px;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.18;
  font-weight: 400;
  letter-spacing: -0.022em;
  color: var(--sj-navy-950);
}

.page-about .about-sec__lead {
  margin: 0 0 22px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-prose p {
  margin: 0 0 1.1em;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-ink-soft);
}

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

.page-about .about-aside {
  margin: 26px 0 0;
  padding: 2px 0 2px 18px;
  border-left: 2px solid var(--sj-gold-500);
  max-width: 30em;
}

.page-about .about-aside p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(7, 16, 24, 0.66);
}

/* ---------- 阶段时间轴 ---------- */
.page-about .about-stages {
  border-top: 1px solid var(--about-line);
}

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

.page-about .about-stage__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .about-stage__head::-webkit-details-marker {
  display: none;
}

.page-about .about-stage__num {
  font-family: var(--sj-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--sj-gold-500);
}

.page-about .about-stage__name {
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 600;
  letter-spacing: -0.012em;
  color: var(--sj-navy-950);
  transition: color 0.2s var(--sj-ease);
}

.page-about .about-stage__head:hover .about-stage__name {
  color: var(--sj-navy-700);
}

.page-about .about-stage__cue {
  flex: 1 1 220px;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(7, 16, 24, 0.56);
}

.page-about .about-stage__mark {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
  margin-left: auto;
}

.page-about .about-stage__mark::before,
.page-about .about-stage__mark::after {
  content: "";
  position: absolute;
  background: var(--sj-gold-500);
  transition: transform 0.22s var(--sj-ease), opacity 0.22s var(--sj-ease);
}

.page-about .about-stage__mark::before {
  inset: 7px 0 auto 0;
  height: 1.5px;
}

.page-about .about-stage__mark::after {
  inset: 0 auto 0 7px;
  width: 1.5px;
}

.page-about .about-stage[open] .about-stage__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .about-stage__body {
  padding: 0 0 24px;
}

.page-about .about-stage__body p {
  margin: 0;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--about-ink-soft);
}

.page-about .about-note {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  align-items: baseline;
  padding: 15px 18px;
  border-left: 2px solid var(--sj-gold-500);
  background: rgba(228, 199, 154, 0.3);
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(7, 16, 24, 0.74);
}

.page-about .about-note__tag {
  font-family: var(--sj-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--sj-navy-950);
}

/* ---------- 团队标签页 ---------- */
.page-about .about-tabs {
  margin-top: 6px;
}

.page-about .about-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-tabs .sj-tabs__tab {
  appearance: none;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  border: 1px solid var(--about-line);
  border-bottom: 0;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.45);
  color: var(--sj-navy-950);
  font-family: inherit;
  font-size: 14px;
  line-height: 1.4;
  padding: 10px 16px;
  cursor: pointer;
  transition: background 0.2s var(--sj-ease), color 0.2s var(--sj-ease), border-color 0.2s var(--sj-ease);
}

.page-about .about-tabs .sj-tabs__tab:hover {
  border-color: var(--sj-gold-500);
}

.page-about .about-tabs .sj-tabs__tab[aria-selected="true"] {
  background: var(--sj-navy-950);
  border-color: var(--sj-navy-950);
  color: var(--sj-sand-050);
}

.page-about .about-tab-count {
  font-family: var(--sj-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--sj-gold-500);
}

.page-about .about-tabs .sj-tabs__tab[aria-selected="true"] .about-tab-count {
  color: var(--sj-gold-300);
}

.page-about .about-tabs .sj-tabs__panel {
  padding: 22px 0 0;
}

.page-about .about-tabs .sj-tabs__panel h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--sj-navy-950);
}

.page-about .about-tabs .sj-tabs__panel p {
  margin: 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--about-ink-soft);
}

.page-about .about-team__media {
  margin: 28px 0 0;
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--about-line);
  object-fit: cover;
}

.page-about .about-team__media figcaption {
  margin-top: 10px;
  font-family: var(--sj-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(7, 16, 24, 0.5);
}

/* ---------- 质量五道关 ---------- */
.page-about .about-quality {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  max-width: 46em;
}

.page-about .about-quality__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 20px 0;
  border-top: 1px solid var(--about-line);
}

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

.page-about .about-quality__num {
  font-family: var(--sj-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--sj-gold-500);
  padding-top: 4px;
}

.page-about .about-quality__item h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--sj-navy-950);
}

.page-about .about-quality__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--about-ink-soft);
}

/* ---------- 覆盖与合作 ---------- */
.page-about .about-reach__panel {
  border: 1px solid var(--sj-line);
  padding: clamp(22px, 4vw, 42px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
  color: var(--sj-on-dark);
  background:
    linear-gradient(152deg, var(--sj-navy-900) 0%, var(--sj-navy-950) 58%, #04121f 100%);
}

.page-about .about-reach__lead {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--sj-on-dark-soft);
}

.page-about .about-reach__stats {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
}

.page-about .about-reach__num {
  display: block;
  font-family: var(--sj-mono);
  font-size: clamp(21px, 3vw, 28px);
  letter-spacing: 0.02em;
  color: var(--sj-gold-300);
}

.page-about .about-reach__unit {
  display: block;
  margin-top: 5px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--sj-mist);
}

.page-about .about-reach__text {
  margin: 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.88;
  color: var(--sj-on-dark-soft);
}

.page-about .about-reach__figure {
  margin: 0;
  border: 1px solid var(--sj-line);
  padding: 8px;
  align-self: start;
}

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

.page-about .about-reach__figure figcaption {
  margin-top: 9px;
  font-family: var(--sj-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--sj-mist);
}

/* ---------- 继续了解 ---------- */
.page-about .about-next {
  display: grid;
  gap: 1px;
  margin-top: clamp(30px, 4vw, 52px);
  border: 1px solid var(--about-line);
  background: var(--about-line);
}

.page-about .about-next__item {
  display: grid;
  gap: 6px;
  padding: 20px 18px;
  background: var(--sj-sand-050);
  text-decoration: none;
  transition: background 0.2s var(--sj-ease);
}

.page-about .about-next__idx {
  font-family: var(--sj-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--sj-gold-500);
}

.page-about .about-next__label {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--sj-navy-950);
  transition: color 0.2s var(--sj-ease);
}

.page-about .about-next__desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(7, 16, 24, 0.6);
  transition: color 0.2s var(--sj-ease);
}

.page-about .about-next__arrow {
  font-size: 14px;
  color: var(--sj-gold-500);
}

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  background: var(--sj-navy-950);
}

.page-about .about-next__item:hover .about-next__label,
.page-about .about-next__item:focus-visible .about-next__label {
  color: var(--sj-sand-050);
}

.page-about .about-next__item:hover .about-next__desc,
.page-about .about-next__item:focus-visible .about-next__desc {
  color: var(--sj-mist);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-prose p {
    font-size: 17px;
  }

  .page-about .about-stage__body {
    padding-left: 42px;
  }

  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
  }

  .page-about .about-reach__panel {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-reach__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--sj-header-h) + 28px);
    align-self: start;
    padding: 0 22px 0 0;
    border-bottom: 0;
    border-right: 1px solid var(--about-line);
  }

  .page-about .about-toc {
    display: block;
    overflow: visible;
  }

  .page-about .sj-toc__link {
    display: flex;
    width: 100%;
    padding: 11px 8px 11px 0;
    white-space: normal;
    border: 0;
    border-bottom: 1px solid var(--about-line-soft);
  }

  .page-about .sj-toc__link:hover,
  .page-about .sj-toc__link:focus-visible {
    background: transparent;
    border-color: var(--sj-gold-500);
    color: var(--sj-navy-950);
  }

  .page-about .sj-toc__link[aria-current="true"] {
    color: var(--sj-navy-950);
    box-shadow: inset 2px 0 0 var(--sj-gold-500);
    padding-left: 10px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-next {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__title {
    letter-spacing: -0.036em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .sj-toc__link,
  .page-about .about-tabs .sj-tabs__tab,
  .page-about .about-next__item,
  .page-about .about-stage__mark::before,
  .page-about .about-stage__mark::after,
  .page-about .about-stage__name {
    transition: none;
  }
}
<<<END>>>