.page-about {
  --about-rule: rgba(110, 140, 154, 0.26);
  --about-soft: rgba(14, 124, 158, 0.12);
  background: var(--mist);
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: clamp(48px, 7vw, 104px);
}

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

.page-about .breadcrumb {
  padding-top: clamp(16px, 2.6vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding: clamp(26px, 4.5vw, 60px) 0 clamp(38px, 5.5vw, 84px);
}

.page-about .about-hero-copy {
  min-width: 0;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  max-width: 17em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 6vw, 4.1rem);
  line-height: 1.04;
  letter-spacing: -0.015em;
  color: var(--deep-sea);
}

.page-about .about-lede {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 40em;
  font-size: clamp(0.98rem, 1.15vw, 1.1rem);
  line-height: 1.8;
  color: var(--deep-water);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 3.4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.page-about .metric-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 2.4vw, 1.9rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--brand);
}

.page-about .metric-label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .about-hero-media {
  margin: 0;
  aspect-ratio: 7 / 5;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(155deg, var(--deep-sea), var(--brand) 62%, var(--bright-cyan));
}

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

/* ---------- 章节 + 索引 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(30px, 4vw, 58px);
  padding-top: clamp(8px, 2vw, 20px);
}

.page-about .about-index {
  min-width: 0;
  border-top: 1px solid var(--about-rule);
  padding-top: 16px;
}

.page-about .index-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .index-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .index-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 13px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.3;
  color: var(--deep-water);
  background: rgba(216, 244, 247, 0.5);
  transition: background 220ms var(--ease), color 220ms var(--ease);
}

.page-about .index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--brand);
}

.page-about .index-link:hover,
.page-about .index-link:focus-visible {
  background: var(--pale-cyan);
  color: var(--deep-sea);
}

.page-about .about-chapters {
  display: grid;
  gap: clamp(44px, 6vw, 84px);
  min-width: 0;
}

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

.page-about .chapter-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(16px, 2vw, 22px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .chapter-number {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.4rem, 2.8vw, 2.05rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--brand);
}

.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.32rem, 2.5vw, 1.95rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--deep-sea);
}

.page-about .about-text {
  margin: 0 0 1em;
  max-width: 64ch;
  font-size: clamp(0.94rem, 1.05vw, 1.03rem);
  line-height: 1.85;
  color: var(--deep-water);
}

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

.page-about .inline-link {
  color: var(--brand);
  text-decoration: none;
  border-bottom: 1px solid rgba(14, 124, 158, 0.4);
  padding-bottom: 1px;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--deep-sea);
  border-color: var(--coral);
}

/* ---------- 改版说明块 ---------- */
.page-about .note-block {
  margin-top: clamp(20px, 3vw, 30px);
  padding: clamp(20px, 3vw, 32px);
  border-radius: var(--radius-lg);
  background: var(--pale-cyan);
  color: var(--ink);
}

.page-about .note-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.03em;
  color: var(--deep-sea);
}

.page-about .note-list {
  margin: 0;
  padding-left: 1.15em;
  display: grid;
  gap: 8px;
}

.page-about .note-list li {
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--deep-water);
}

/* ---------- 能力清单 ---------- */
.page-about .capability-list {
  margin: clamp(20px, 3vw, 28px) 0;
  padding: 0;
  list-style: none;
}

.page-about .capability {
  display: grid;
  gap: 5px 20px;
  padding: 18px 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .capability:last-child {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .capability-key {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
  letter-spacing: 0.02em;
  color: var(--deep-sea);
}

.page-about .capability-desc {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.75;
  color: var(--deep-water);
}

/* ---------- 同步章节配图 ---------- */
.page-about .sync-figure {
  margin: clamp(22px, 3vw, 30px) 0;
  aspect-ratio: 3 / 2;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(150deg, var(--deep-water), var(--brand) 70%, var(--bright-cyan));
}

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

/* ---------- 团队三列 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 16px;
  margin: clamp(20px, 3vw, 30px) 0;
}

.page-about .team-card {
  background: var(--pale-cyan);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 2.6vw, 28px);
}

.page-about .team-tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--brand);
}

.page-about .team-name {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.16rem;
  letter-spacing: 0.01em;
  color: var(--deep-sea);
}

.page-about .team-desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--deep-water);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline-track {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline-node {
  position: relative;
  padding: 2px 0 26px 26px;
  border-left: 2px solid rgba(14, 124, 158, 0.22);
}

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 4px;
  background: var(--brand);
}

.page-about .timeline-node:nth-child(2)::before {
  background: var(--bright-cyan);
}

.page-about .timeline-node:nth-child(3)::before {
  background: var(--coral);
}

.page-about .timeline-node:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .timeline-when {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .timeline-title {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
  letter-spacing: 0.01em;
  color: var(--deep-sea);
}

.page-about .timeline-text {
  margin: 0;
  max-width: 42em;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--deep-water);
}

.page-about .timeline-figure {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(140deg, var(--deep-water), var(--brand));
}

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

/* ---------- 服务对象胶囊 ---------- */
.page-about .audience-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(18px, 2.6vw, 26px) 0;
  padding: 0;
  list-style: none;
}

.page-about .audience-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  background: #ffffff;
  border: 1px solid rgba(14, 124, 158, 0.24);
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--deep-water);
  transition: background 220ms var(--ease), border-color 220ms var(--ease), color 220ms var(--ease);
}

.page-about .audience-pill::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--coral);
  flex: none;
}

.page-about .audience-pill:hover,
.page-about .audience-pill:focus-within {
  background: var(--pale-cyan);
  border-color: var(--brand);
  color: var(--deep-sea);
}

/* ---------- 联系区块 ---------- */
.page-about .contact-block {
  display: grid;
  gap: 6px;
  margin-top: clamp(18px, 2.6vw, 26px);
  padding: clamp(22px, 3.6vw, 38px);
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, var(--deep-sea), var(--deep-water) 58%, var(--brand));
  color: var(--mist);
}

.page-about .contact-intro {
  margin: 0 0 10px;
  max-width: 40em;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin: 0;
  padding: 12px 0;
  border-top: 1px solid rgba(245, 251, 252, 0.16);
}

.page-about .contact-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--bright-cyan);
}

.page-about .contact-value {
  font-family: var(--font-mono);
  font-size: 0.94rem;
  color: var(--mist);
  word-break: break-all;
}

.page-about .copy-btn {
  border: 1px solid rgba(39, 199, 217, 0.55);
  background: transparent;
  color: var(--bright-cyan);
  border-radius: var(--radius-pill);
  padding: 5px 13px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background 200ms var(--ease), color 200ms var(--ease);
}

.page-about .copy-btn:hover,
.page-about .copy-btn:focus-visible {
  background: var(--bright-cyan);
  color: var(--deep-sea);
}

.page-about .contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .metric {
    padding: 20px 18px;
  }
}

@media (min-width: 760px) {
  .page-about .capability {
    grid-template-columns: 172px minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    padding-bottom: 46px;
  }

  .page-about .team-card:nth-child(2) {
    transform: translateY(24px);
  }

  .page-about .team-card:nth-child(3) {
    transform: translateY(48px);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .timeline-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .timeline-node {
    padding: 28px 0 0;
    border-left: 0;
  }

  .page-about .timeline-node::before {
    left: 0;
    top: 0;
  }

  .page-about .timeline-node::after {
    content: "";
    position: absolute;
    left: 18px;
    right: -20px;
    top: 5px;
    height: 2px;
    background: linear-gradient(90deg, var(--brand), var(--bright-cyan));
    opacity: 0.45;
  }

  .page-about .timeline-node:last-child::after {
    display: none;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: minmax(196px, 250px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 88px;
  }

  .page-about .index-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .index-link {
    width: 100%;
    border-radius: var(--radius-sm);
    background: transparent;
    padding: 8px 12px;
  }

  .page-about .index-link:hover,
  .page-about .index-link:focus-visible {
    background: var(--pale-cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .index-link,
  .page-about .inline-link,
  .page-about .audience-pill,
  .page-about .copy-btn {
    transition: none;
  }

  .page-about .team-card:nth-child(2),
  .page-about .team-card:nth-child(3) {
    transform: none;
  }

  .page-about .team-grid {
    padding-bottom: 0;
  }
}
<<<END>>>