.page-about {
  --about-mark-w: 128px;
  --about-prose: 36rem;
  --about-dark-line: rgba(198, 242, 78, 0.18);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(48px, 8vw, 96px) 0 clamp(44px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: clamp(72px, 20vw, 240px);
  height: 3px;
  background: var(--orange);
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 30px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.page-about .about-hero .breadcrumbs a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero .breadcrumbs a:hover,
.page-about .about-hero .breadcrumbs a:focus-visible {
  color: var(--ember);
  border-bottom-color: currentColor;
}

.page-about .about-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 20px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 5.6vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 20ch;
  margin: 0 0 26px;
}

.page-about .about-lede {
  font-size: clamp(16px, 1.1vw, 18px);
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0 0 42px;
}

.page-about .measure {
  max-width: var(--about-prose);
}

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

.page-about .about-fact {
  background: var(--paper-card);
  padding: 18px 20px 20px;
}

.page-about .about-fact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.page-about .about-fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.02em;
}

/* ---------- 章节骨架 ---------- */

.page-about .sec {
  padding: clamp(52px, 8vw, 108px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .sec__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .sec__marker {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .sec__mark {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(34px, 5.4vw, 60px);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--orange);
}

.page-about .sec__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.page-about .sec__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  margin: 0 0 20px;
}

.page-about .sec__intro {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 4px;
}

.page-about .prose p {
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
  margin: 0 0 1.25em;
}

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

.page-about .link {
  color: var(--ember);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color var(--dur) var(--ease);
}

.page-about .link:hover,
.page-about .link:focus-visible {
  color: var(--orange);
}

/* ---------- 业务三条线 ---------- */

.page-about .work-list {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
}

.page-about .work-item {
  border-top: 1px solid var(--line);
  padding: 26px 0;
}

.page-about .work-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .work-item__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 12px;
}

.page-about .work-item__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--orange);
  border: 1px solid var(--line);
  border-radius: var(--pill);
  padding: 3px 10px;
  line-height: 1.4;
}

.page-about .work-item__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2vw, 23px);
  line-height: 1.3;
  margin: 0;
}

.page-about .work-item__text {
  font-size: 16px;
  line-height: 1.82;
  color: var(--ink-soft);
  margin: 0;
}

/* ---------- 图片容器 ---------- */

.page-about .media {
  margin: 0;
}

.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-md);
  background: var(--green-card);
}

.page-about .media__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

/* ---------- 团队 ---------- */

.page-about .team-media {
  margin: 26px 0 30px;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .team-card {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 24px 22px 26px;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

.page-about .team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 42px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--green);
  margin-bottom: 14px;
}

.page-about .team-card__role {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  margin: 0 0 10px;
}

.page-about .team-card p {
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0;
}

/* ---------- 深色版本章节 ---------- */

.page-about .sec--dark {
  background: var(--green);
  color: var(--paper);
  border-bottom-color: var(--about-dark-line);
}

.page-about .sec--dark .sec__title {
  color: var(--paper);
}

.page-about .sec--dark .sec__mark {
  color: var(--lime);
}

.page-about .sec--dark .sec__tag {
  color: var(--mist);
}

.page-about .sec--dark .sec__intro {
  color: var(--mist);
}

.page-about .sec--dark .media__cap {
  color: var(--mist);
}

.page-about .timeline-media {
  margin: 30px 0 0;
}

.page-about .timeline-media img {
  background: var(--green-card);
  border: 1px solid var(--about-dark-line);
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 22px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--about-dark-line);
}

.page-about .timeline__node {
  position: relative;
  padding-left: 30px;
  outline: none;
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--lime);
  background: var(--green);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .timeline__node:hover::before,
.page-about .timeline__node:focus-visible::before {
  background: var(--lime);
  box-shadow: 0 0 0 5px rgba(198, 242, 78, 0.14);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--lime);
  margin: 0 0 6px;
}

.page-about .timeline__ver {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0 0 10px;
}

.page-about .timeline__desc {
  font-size: 14px;
  line-height: 1.72;
  color: rgba(244, 239, 228, 0.76);
  margin: 0;
}

/* ---------- 服务覆盖 ---------- */

.page-about .cov {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin-top: 6px;
}

.page-about .cov__text p {
  font-size: 17px;
  line-height: 1.85;
  margin: 0 0 1.15em;
}

.page-about .cov__text p:last-of-type {
  margin-bottom: 0;
}

.page-about .cov-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.page-about .cov-stat {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 16px 16px 18px;
}

.page-about .cov-stat b {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--green);
}

.page-about .cov-stat span {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink-soft);
}

.page-about .cov__media {
  margin-top: 4px;
}

/* ---------- 合作生态 ---------- */

.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 32px 0 0;
}

.page-about .partner-card {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 26px 24px 28px;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

.page-about .partner-card__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 40px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ember);
  margin-bottom: 14px;
}

.page-about .partner-card__label {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  margin: 0 0 10px;
}

.page-about .partner-card p {
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0;
}

.page-about .honor {
  margin-top: 26px;
  background: var(--navy);
  color: var(--paper);
  border-radius: var(--r-lg);
  padding: 28px 26px 30px;
}

.page-about .honor__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
  margin: 0 0 14px;
}

.page-about .honor__text {
  font-size: 16px;
  line-height: 1.82;
  color: rgba(244, 239, 228, 0.86);
  margin: 0;
  max-width: 40rem;
}

.page-about .tail-note {
  margin: 30px 0 0;
  font-size: 16px;
  line-height: 1.82;
  color: var(--ink-soft);
}

/* ---------- 窄屏保护 ---------- */

@media (max-width: 420px) {
  .page-about .about-facts {
    grid-template-columns: 1fr;
  }

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

  .page-about .work-item__head {
    flex-wrap: wrap;
    gap: 10px;
  }
}

/* ---------- 平板 ---------- */

@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

/* ---------- 桌面：章节双栏 + 边注 ---------- */

@media (min-width: 900px) {
  .page-about .sec__grid {
    grid-template-columns: var(--about-mark-w) minmax(0, 1fr);
    column-gap: 48px;
  }

  .page-about .sec__marker {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    align-self: start;
  }

  .page-about .sec__main {
    max-width: 60rem;
  }

  .page-about .work-item {
    display: grid;
    grid-template-columns: minmax(0, 15rem) minmax(0, 1fr);
    column-gap: 32px;
    align-items: start;
    padding: 30px 0;
  }

  .page-about .work-item__head {
    display: block;
    margin-bottom: 0;
  }

  .page-about .work-item__idx {
    display: inline-block;
    margin-bottom: 12px;
  }

  .page-about .cov {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .team-media {
    margin: 28px 0 34px;
  }

  /* 时间线转为横向 */
  .page-about .timeline {
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 0;
    margin-top: 46px;
  }

  .page-about .timeline::before {
    left: 0;
    right: 0;
    top: 7px;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .page-about .timeline__node {
    padding-left: 0;
    padding-right: 18px;
    padding-top: 36px;
  }

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

  .page-about .timeline__desc {
    opacity: 0;
    transition: opacity var(--dur) var(--ease);
  }

  .page-about .timeline__node:hover .timeline__desc,
  .page-about .timeline__node:focus-visible .timeline__desc,
  .page-about .timeline__node:focus-within .timeline__desc {
    opacity: 1;
  }
}

@media (min-width: 1180px) {
  .page-about .sec__grid {
    column-gap: 64px;
  }

  .page-about .team-grid {
    gap: 18px;
  }
}

/* ---------- 动效偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .partner-card,
  .page-about .timeline__node::before,
  .page-about .timeline__desc {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .partner-card:hover {
    transform: none;
  }
}