.page-about {
  --about-rule: 1px solid rgba(107, 143, 176, 0.32);
  --about-rule-soft: 1px solid rgba(107, 143, 176, 0.18);
  background: var(--c-deep);
  color: var(--c-foam);
}

.page-about .breadcrumb {
  padding-top: 20px;
  color: var(--c-steel);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .breadcrumb a {
  color: var(--c-steel);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--c-cyan);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--c-foam);
}

/* ---------- 首屏框景 ---------- */

.page-about .about-hero {
  padding: 22px 0 clamp(40px, 7vw, 76px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 2px solid var(--c-cyan);
  box-shadow: var(--hard);
  padding: clamp(24px, 5vw, 52px) clamp(20px, 4.5vw, 56px) clamp(26px, 5vw, 48px);
  background:
    linear-gradient(180deg, rgba(22, 48, 79, 0.72) 0%, rgba(11, 31, 58, 0) 68%);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid var(--c-cyan);
  pointer-events: none;
}

.page-about .about-hero__frame::before {
  top: -2px;
  left: -2px;
  border-right: none;
  border-bottom: none;
}

.page-about .about-hero__frame::after {
  bottom: -2px;
  right: -2px;
  border-left: none;
  border-top: none;
}

.page-about .about-hero__title {
  margin: 22px 0 0;
  font-family: var(--f-sans);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--c-white);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 40em;
  font-size: clamp(15px, 1.9vw, 18px);
  line-height: 1.8;
  color: var(--c-foam);
}

.page-about .about-hero__figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 32px;
  padding-top: 26px;
  border-top: var(--about-rule);
}

.page-about .about-hero__figures .stat {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-about .about-hero__figures .stat__value {
  font-family: var(--f-mono);
  font-size: clamp(30px, 6vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__figures .stat__unit {
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--c-cyan-soft);
  margin-top: 6px;
}

.page-about .about-hero__figures .stat__label {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-steel);
}

.page-about .tick-line {
  margin-top: 26px;
  padding-left: 16px;
  position: relative;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-steel);
  line-height: 1.7;
}

.page-about .tick-line::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 10px;
  height: 1px;
  background: var(--c-cyan);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body {
  display: grid;
  gap: 32px;
  padding-bottom: clamp(40px, 8vw, 90px);
}

.page-about .about-toc {
  position: relative;
  padding: 12px 0;
  border-top: var(--about-rule-soft);
  border-bottom: var(--about-rule-soft);
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-steel);
}

.page-about .about-toc__track {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 12px;
  border: 1px solid rgba(107, 143, 176, 0.3);
  color: var(--c-foam);
  font-size: 13px;
  text-decoration: none;
  transition: border-color 200ms ease, color 200ms ease;
}

.page-about .about-toc__num {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--c-steel);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
}

.page-about .about-toc__link[aria-current="true"] {
  border-color: var(--c-cyan);
  background: rgba(46, 230, 214, 0.08);
}

.page-about .about-toc__link[aria-current="true"] .about-toc__num,
.page-about .about-toc__link[aria-current="true"] span:last-child {
  color: var(--c-cyan);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(44px, 7vw, 88px);
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  scroll-margin-top: calc(var(--bar-h) + 90px);
}

.page-about .about-chapter__title {
  margin: 20px 0 0;
  font-family: var(--f-sans);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--c-white);
}

.page-about .about-chapter__lead {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: clamp(14.5px, 1.8vw, 17px);
  line-height: 1.8;
  color: var(--c-foam);
}

.page-about .about-prose {
  margin-top: 22px;
  max-width: 40em;
}

.page-about .about-prose p {
  margin: 0 0 18px;
  font-size: clamp(14.5px, 1.8vw, 17px);
  line-height: 1.85;
  color: var(--c-foam);
}

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

.page-about .about-quote {
  margin-top: 30px;
  padding: 20px 22px;
  border-left: 3px solid var(--c-coral);
  background: rgba(255, 107, 74, 0.07);
}

.page-about .about-quote p {
  margin: 0;
  font-size: clamp(15px, 2.1vw, 19px);
  line-height: 1.7;
  color: var(--c-white);
  font-weight: 600;
}

/* ---------- 团队 ---------- */

.page-about .about-split {
  display: grid;
  gap: 24px;
  margin-top: 26px;
}

.page-about .about-split__text p {
  margin: 0 0 16px;
  font-size: clamp(14.5px, 1.8vw, 17px);
  line-height: 1.85;
  color: var(--c-foam);
}

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

.page-about .about-split__media {
  margin: 0;
  border: 2px solid rgba(46, 230, 214, 0.5);
}

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

.page-about .about-shifts {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-shifts .data-card {
  background: var(--c-night);
  border: 2px solid var(--c-abyss);
  box-shadow: var(--hard-sm);
}

.page-about .about-shifts .data-card__head {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 16px 18px;
  background: transparent;
  border: none;
  color: var(--c-white);
  font-family: var(--f-sans);
  font-size: 15.5px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.page-about .about-shifts .data-card__head:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: -2px;
}

.page-about .about-shifts .data-card__title {
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .about-shifts .data-card__meta {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
  white-space: nowrap;
}

.page-about .about-shifts .data-card__inner {
  padding: 0 18px 18px;
}

.page-about .about-shifts .data-card__inner p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-foam);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  display: grid;
  gap: 32px;
  margin-top: 30px;
}

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

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 23px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan) 0%, rgba(46, 230, 214, 0.12) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 22px;
}

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

.page-about .about-timeline__marker {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 28px;
  background: var(--c-deep);
  border: 1px solid var(--c-cyan);
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-cyan);
}

.page-about .about-timeline__plate {
  padding: 4px 0 0;
  border-top: var(--about-rule-soft);
  padding-top: 12px;
}

.page-about .about-timeline__plate h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.45;
}

.page-about .about-timeline__plate p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-foam);
}

.page-about .about-timeline__media {
  margin: 0;
  border: 2px solid rgba(46, 230, 214, 0.4);
  max-width: 420px;
}

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

/* ---------- 流程 ---------- */

.page-about .about-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-rule-soft);
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
}

.page-about .about-steps__item {
  background: var(--c-deep);
  padding: 20px 4px;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 6px;
  align-items: start;
}

.page-about .about-steps__num {
  grid-row: span 2;
  font-family: var(--f-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--c-coral);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.page-about .about-steps__item h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: 0.02em;
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-foam);
}

/* ---------- 伙伴 ---------- */

.page-about .about-partners {
  margin-top: 26px;
}

.page-about .about-partner {
  padding: 22px 20px;
  background: var(--c-night);
  border: 2px solid var(--c-abyss);
  box-shadow: var(--hard-sm);
  min-width: 0;
}

.page-about .about-partner__count {
  display: block;
  font-family: var(--f-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partner h3 {
  margin: 14px 0 10px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-foam);
}

.page-about .about-reach {
  margin-top: 30px;
  padding-top: 22px;
  border-top: var(--about-rule);
}

.page-about .about-reach__line {
  margin: 0;
  font-size: clamp(15px, 2vw, 17.5px);
  line-height: 1.8;
  color: var(--c-white);
  max-width: 40em;
}

/* ---------- 做法 ---------- */

.page-about .about-rules {
  margin-top: 26px;
}

.page-about .about-rule {
  padding: 20px 0 4px;
  border-top: 3px solid var(--c-cyan);
  min-width: 0;
}

.page-about .about-rule h3 {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-rule p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-foam);
}

/* ---------- 收尾 ---------- */

.page-about .about-closing {
  padding: clamp(28px, 5vw, 56px) 0 clamp(48px, 8vw, 88px);
}

.page-about .about-closing__frame {
  border: 2px solid var(--c-abyss);
  box-shadow: var(--hard);
  background: var(--c-night);
  padding: clamp(24px, 4.5vw, 46px);
}

.page-about .about-closing__text h2 {
  margin: 0;
  font-size: clamp(22px, 4vw, 34px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--c-white);
}

.page-about .about-closing__text p {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: clamp(14.5px, 1.8vw, 16.5px);
  line-height: 1.85;
  color: var(--c-foam);
}

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

.page-about .about-closing__media {
  margin: 28px 0 0;
  border: 2px solid rgba(46, 230, 214, 0.36);
}

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

.page-about .about-closing__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: var(--about-rule-soft);
}

.page-about .about-closing__links a {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  color: var(--c-cyan);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.page-about .about-closing__links a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 1px;
  background: var(--c-cyan);
}

.page-about .about-closing__links a:hover {
  color: var(--c-cyan-soft);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-shifts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-steps__item {
    grid-template-columns: 60px minmax(0, 1fr);
    padding: 24px 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: 6fr 5fr;
    align-items: start;
    gap: 36px;
  }

  .page-about .about-timeline {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 40px;
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    border-top: none;
    border-bottom: none;
    padding: 0;
    align-self: start;
  }

  .page-about .about-toc__track {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding-bottom: 0;
  }

  .page-about .about-toc__link {
    border: none;
    border-left: 2px solid rgba(107, 143, 176, 0.3);
    padding: 9px 0 9px 14px;
    font-size: 13.5px;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    border-left-color: var(--c-cyan);
  }

  .page-about .about-toc__link[aria-current="true"] {
    background: transparent;
    border-left-color: var(--c-cyan);
  }

  .page-about .about-flow {
    gap: 96px;
  }

  .page-about .about-timeline {
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 52px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 72px;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link {
    transition: none;
  }
}
</final>