.page-about {
  --about-track: 88px;
  --about-gap: clamp(20px, 3vw, 40px);
  --about-edge: clamp(20px, 4vw, 32px);
  background: var(--ink);
  color: var(--cream);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-shell {
  padding-top: calc(var(--header-h) + clamp(24px, 5vw, 48px));
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 32px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .breadcrumb a {
  color: var(--stone);
  text-decoration: none;
  transition: color 140ms ease;
}

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

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

.page-about .breadcrumb-sep {
  color: var(--line);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  margin-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-hero-window {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 56px);
  border-radius: var(--r-xl);
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(30, 66, 56, 0.75) 0%, rgba(11, 26, 21, 0) 62%),
    linear-gradient(168deg, var(--coal) 0%, var(--ink) 100%);
}

.page-about .about-hero-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 22em;
  font-size: clamp(26px, 4.6vw, 40px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.5px;
  color: var(--cream);
}

.page-about .about-hero-lead {
  margin: clamp(16px, 2.5vw, 24px) 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.8);
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--line);
  overflow: hidden;
}

.page-about .fact {
  background: rgba(20, 28, 25, 0.86);
  padding: clamp(14px, 2vw, 20px);
}

.page-about .fact dt {
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .fact dd {
  display: flex;
  align-items: baseline;
  gap: 5px;
  margin: 0;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

.page-about .stat-unit {
  font-size: 12px;
  color: var(--stone);
}

/* ---------- 通用双栏错落 ---------- */
.page-about .about-grid {
  display: grid;
  gap: var(--about-gap);
}

/* ---------- 我们做什么 ---------- */
.page-about .about-mission-text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.82);
}

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

/* ---------- 数据来源 ---------- */
.page-about .source-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 28px);
}

.page-about .source-step {
  padding-top: 16px;
  border-top: 2px solid var(--orange);
}

.page-about .source-step .idx {
  display: block;
  margin-bottom: 10px;
  color: var(--stone);
}

.page-about .source-step h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .source-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.72);
}

/* ---------- 团队 ---------- */
.page-about .about-team-lead,
.page-about .about-team-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.82);
}

.page-about .about-team-note {
  margin-top: 18px;
  font-size: 14px;
  color: rgba(247, 243, 234, 0.68);
}

.page-about .team-bar {
  display: flex;
  gap: 4px;
  margin: clamp(20px, 3vw, 28px) 0 0;
}

.page-about .team-seg {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
  padding: 16px clamp(12px, 2vw, 18px);
  border-radius: var(--r-lg);
  color: var(--ink);
  overflow: hidden;
}

.page-about .team-seg--edit {
  flex: 14 1 0;
  background: var(--orange);
}

.page-about .team-seg--eng {
  flex: 18 1 0;
  background: var(--cyan);
}

.page-about .team-seg-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .team-seg-name {
  font-size: 12px;
  line-height: 1.3;
  opacity: 0.82;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .about-team-photo img {
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--r-lg);
  display: block;
}

/* ---------- 关键节点 ---------- */
.page-about .about-timeline-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-years-label {
  margin: 0 0 12px;
  color: var(--stone);
}

.page-about .year-list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0 0 4px;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .year-list::-webkit-scrollbar {
  display: none;
}

.page-about .year-tick {
  position: relative;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cream);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 160ms ease, color 160ms ease;
}

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

.page-about .year-dot {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .about-milestones {
  list-style: none;
  display: grid;
  gap: clamp(18px, 3vw, 26px);
  margin: 0;
  padding: 0;
}

.page-about .milestone {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, var(--coal) 0%, rgba(20, 28, 25, 0.6) 100%);
  scroll-margin-top: calc(var(--header-h) + 96px);
}

.page-about .milestone-year {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .milestone h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 2.4vw, 20px);
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.3px;
  color: var(--cream);
}

.page-about .milestone p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.74);
}

.page-about .about-timeline-figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
  max-width: 420px;
}

.page-about .about-timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--r-lg);
}

/* ---------- 覆盖能力 ---------- */
.page-about .cover-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--line);
  overflow: hidden;
}

.page-about .cover-cell {
  padding: clamp(16px, 2.6vw, 26px);
  background: var(--coal);
}

.page-about .cover-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .cover-value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0 0 10px;
}

.page-about .cover-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(247, 243, 234, 0.62);
}

.page-about .about-cover-tail {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.72);
}

/* ---------- 合作生态 ---------- */
.page-about .about-grid--partners .col-partner-text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.82);
}

.page-about .partner-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 18px;
  padding: 0;
}

.page-about .about-partners-link {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.7);
}

.page-about .about-partners-photo {
  margin: 0;
}

.page-about .about-partners-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--r-lg);
}

/* ---------- 更新标准 ---------- */
.page-about .about-standards-window {
  padding: clamp(24px, 4vw, 48px);
  border-radius: var(--r-xl);
  border: 1px solid var(--line);
  background:
    radial-gradient(110% 130% at 0% 100%, rgba(180, 85, 47, 0.24) 0%, rgba(11, 26, 21, 0) 60%),
    var(--coal);
}

.page-about .standard-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 26px);
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 0;
}

.page-about .standard-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .standard-num {
  flex: none;
  min-width: 3.4em;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .standard-unit {
  margin-left: 3px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--stone);
}

.page-about .standard-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(247, 243, 234, 0.76);
}

.page-about .about-standards-tail {
  margin: clamp(22px, 3vw, 30px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.7);
}

/* ---------- 链接通用 ---------- */
.page-about a:not(.year-tick):not(.breadcrumb a) {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 206, 0.4);
  transition: border-color 140ms ease, color 140ms ease;
}

.page-about a:not(.year-tick):not(.breadcrumb a):hover,
.page-about a:not(.year-tick):not(.breadcrumb a):focus-visible {
  border-color: var(--cyan);
}

/* ---------- 媒体说明牌 ---------- */
.page-about .media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--stone);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .source-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: clamp(24px, 3vw, 44px);
  }

  .page-about .col-narrow {
    grid-column: 1 / span 5;
  }

  .page-about .col-wide {
    grid-column: 7 / span 6;
  }

  .page-about .about-grid--team .col-team-text {
    grid-column: 1 / span 7;
  }

  .page-about .about-grid--team .about-team-photo {
    grid-column: 8 / span 5;
    align-self: center;
    margin: 0;
  }

  .page-about .about-grid--partners .col-partner-text {
    grid-column: 1 / span 7;
  }

  .page-about .about-grid--partners .about-partners-photo {
    grid-column: 8 / span 5;
    align-self: center;
  }

  .page-about .source-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-timeline-grid {
    grid-template-columns: var(--about-track) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-years {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
  }

  .page-about .about-years-label {
    padding-left: 22px;
  }

  .page-about .year-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .year-tick {
    display: block;
    padding: 14px 0 14px 22px;
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
  }

  .page-about .year-dot {
    position: absolute;
    left: -4px;
    top: 50%;
    transform: translateY(-50%);
  }

  .page-about .year-num {
    padding-left: 2px;
  }

  .page-about .about-timeline-figure {
    margin-left: 26%;
  }
}

@media (min-width: 1120px) {
  .page-about .about-milestones {
    gap: clamp(22px, 3vw, 32px);
  }

  .page-about .milestone:nth-child(odd) {
    margin-right: 16%;
  }

  .page-about .milestone:nth-child(even) {
    margin-left: 12%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .year-tick,
  .page-about .breadcrumb a,
  .page-about a:not(.year-tick):not(.breadcrumb a) {
    transition: none;
  }
}
<<<END>>>