.page-about {
  --about-max: 1240px;
  --about-rail: 168px;
  padding: 0 clamp(1.25rem, 4vw, 3rem) clamp(5rem, 9vw, 8rem);
  background:
    radial-gradient(ellipse at 12% 10%, rgba(255, 107, 0, .07), transparent 42%),
    radial-gradient(ellipse at 88% 68%, rgba(0, 201, 167, .05), transparent 38%),
    var(--bg);
  color: var(--text);
}

/* 面包屑 */
.page-about .breadcrumb {
  max-width: var(--about-max);
  margin: 0 auto 2.5rem;
  padding-top: calc(var(--header-h) + 1.25rem);
}

/* 章节通用结构 */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem 3rem;
  max-width: var(--about-max);
  margin: 0 auto clamp(4rem, 8vw, 6.5rem);
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
}

.page-about .about-mission {
  border-top: none;
  padding-top: 0;
  gap: 1.5rem 3rem;
}

/* 章节索引栏 */
.page-about .section-rail {
  display: flex;
  align-items: baseline;
  gap: .7rem;
}

.page-about .rail-chapter {
  font-family: var(--font-data);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--accent);
}

.page-about .rail-label {
  font-family: var(--font-display);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--muted);
}

/* 正文容器 */
.page-about .mission-body,
.page-about .numbers-body,
.page-about .timeline-body,
.page-about .credential-body,
.page-about .team-body,
.page-about .commitment-body {
  min-width: 0;
}

/* 章节 kicker */
.page-about .section-kicker {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--data);
  margin-bottom: 1rem;
}

.page-about .section-kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--accent);
}

/* 标题 */
.page-about h1 {
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 7vw, 4.8rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.03em;
  margin: 0 0 1.25rem;
  text-wrap: balance;
}

.page-about .h1-mark {
  color: var(--accent);
}

.page-about h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4.4vw, 2.8rem);
  line-height: 1.12;
  letter-spacing: -.02em;
  margin: 0 0 .85rem;
}

.page-about .section-sub {
  font-size: .98rem;
  line-height: 1.75;
  color: var(--muted);
  max-width: 40em;
  margin-bottom: 2rem;
}

/* 使命正文 */
.page-about .mission-lead {
  font-size: 1.06rem;
  line-height: 1.85;
  color: var(--muted);
  max-width: 42em;
  margin-bottom: 1.8rem;
}

.page-about .mission-meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin: 0 0 2rem;
  padding: 0;
}

.page-about .mission-meta li {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .55rem 1rem;
  background: var(--bg-card-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-family: var(--font-data);
  font-size: .78rem;
}

.page-about .mission-meta .meta-label {
  color: var(--muted);
  font-family: var(--font-body);
}

.page-about .mission-meta strong {
  color: var(--data);
  font-weight: 700;
  font-size: .9rem;
}

/* 框架图 */
.page-about .frame-panel {
  padding: 0;
  overflow: hidden;
  border-radius: 4px;
}

.page-about .frame-panel img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 4px;
}

.page-about .hero-photo {
  margin-top: 1rem;
}

/* 数字网格 */
.page-about .numbers-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: .85rem;
}

.page-about .number-cell {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  padding: 1.4rem 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: transform .35s var(--ease), border-color .35s var(--ease), background .35s var(--ease);
}

.page-about .number-cell:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  background: var(--bg-card-soft);
}

.page-about .num-value {
  font-family: var(--font-data);
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--data);
}

.page-about .num-caption {
  font-size: .78rem;
  color: var(--muted);
}

/* 文案图片/时间线图 */
.page-about .timeline-chart figcaption {
  padding: 1rem;
  font-size: .78rem;
  color: var(--muted);
  background: var(--bg-card-soft);
  border-top: 1px solid var(--border);
}

.page-about .timeline-chart figcaption a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

/* 时间线 */
.page-about .timeline-list {
  list-style: none;
  margin: 0 0 2.5rem;
  padding: 0;
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 1.65rem 92px;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 74px;
  top: 14px;
  bottom: -4px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--border));
  opacity: .5;
}

.page-about .timeline-item:last-child::before {
  display: none;
}

.page-about .timeline-year {
  position: absolute;
  left: 0;
  top: 4px;
  width: 60px;
  font-family: var(--font-data);
  font-size: .84rem;
  font-weight: 600;
  color: var(--accent);
  text-align: right;
}

.page-about .timeline-dot {
  position: absolute;
  left: 70px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  z-index: 1;
}

.page-about .timeline-content h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.4;
  margin-bottom: .35rem;
}

.page-about .timeline-content p {
  font-size: .88rem;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
  max-width: 36em;
}

.page-about .timeline-chart {
  margin-top: .5rem;
}

/* 资质与荣誉 */
.page-about .credential-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .credential-card {
  position: relative;
  padding: 1.6rem 1.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: transform .35s var(--ease), border-color .35s var(--ease);
}

.page-about .credential-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.page-about .tag-badge {
  display: inline-block;
  padding: .3rem .7rem;
  margin-bottom: 1rem;
  font-family: var(--font-data);
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(255, 107, 0, .35);
  border-radius: 999px;
}

.page-about .credential-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  line-height: 1.4;
  margin-bottom: .55rem;
}

.page-about .credential-card p {
  font-size: .86rem;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

/* 团队构成 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.page-about .team-card {
  padding: 1.6rem 1.4rem;
  background: var(--bg-card-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: transform .35s var(--ease), border-color .35s var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-3px);
  border-color: var(--data);
}

.page-about .team-num {
  display: block;
  font-family: var(--font-data);
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  margin-bottom: .65rem;
}

.page-about .team-card h3 {
  font-family: var(--font-display);
  font-size: 1.02rem;
  line-height: 1.4;
  margin-bottom: .45rem;
}

.page-about .team-card p {
  font-size: .86rem;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.page-about .team-figure {
  margin-top: 1.5rem;
}

/* 品牌承诺 */
.page-about .commitment-quote {
  font-family: var(--font-body);
  font-size: 1.02rem;
  line-height: 1.9;
  color: var(--text);
  background: var(--bg-card-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 1.4rem 1.5rem;
  margin: 1.5rem 0 2rem;
  max-width: 42em;
}

.page-about .commitment-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* 桌面端 */
@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0 3.5rem;
  }

  .page-about .section-rail {
    justify-content: flex-end;
    text-align: right;
    gap: .5rem;
    padding-top: .85rem;
    border-right: 1px solid var(--border);
    padding-right: 1.4rem;
    margin-right: .6rem;
  }

  .page-about .about-mission {
    grid-template-columns: var(--about-rail) minmax(0, 1fr) minmax(300px, .85fr);
    gap: 0 2.5rem;
    align-items: start;
  }

  .page-about .about-mission .mission-body {
    grid-column: 2;
  }

  .page-about .about-mission .hero-photo {
    grid-column: 3;
    grid-row: 1;
    margin-top: .4rem;
  }

  .page-about .numbers-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }

  .page-about .credential-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .page-about .team-body {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    column-gap: 2.5rem;
  }

  .page-about .team-body .section-kicker,
  .page-about .team-body h2,
  .page-about .team-body .section-sub {
    grid-column: 1 / -1;
  }

  .page-about .team-body .team-grid {
    grid-column: 1;
    grid-template-columns: 1fr;
    margin-bottom: 0;
  }

  .page-about .team-body .team-figure {
    grid-column: 2;
    grid-row: 3;
    margin-top: 0;
    align-self: start;
  }
}

/* 超窄屏微调 */
@media (max-width: 380px) {
  .page-about .timeline-item {
    padding-left: 76px;
  }

  .page-about .timeline-item::before {
    left: 62px;
  }

  .page-about .timeline-year {
    width: 50px;
    font-size: .78rem;
  }

  .page-about .timeline-dot {
    left: 58px;
  }

  .page-about .numbers-grid {
    grid-template-columns: 1fr;
  }
}