.page-about {
  --about-rule: rgba(11, 59, 46, 0.16);
  --about-rail: clamp(84px, 11vw, 140px);
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

/* ---------- 面包屑与页头 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(20px, 3vw, 32px);
}

.page-about .page-head {
  padding-block: clamp(28px, 5vw, 52px) clamp(36px, 6vw, 68px);
}

.page-about .page-head .h-display {
  max-width: 22ch;
  margin-top: 14px;
}

.page-about .head-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 44px);
  margin-top: clamp(22px, 3.4vw, 38px);
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 2px solid var(--red);
}

@media (min-width: 900px) {
  .page-about .head-grid {
    grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.35vw, 18px);
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .head-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .head-facts li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .head-facts li:first-child {
  border-top: 1px solid var(--about-rule);
}

.page-about .head-facts .num {
  min-width: 4.2rem;
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 600;
  color: var(--green-deep);
}

.page-about .head-facts__k {
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

/* ---------- 下一步导引带 ---------- */
.page-about .next-band {
  padding-block: clamp(30px, 4.6vw, 52px);
  border-block: 1px solid var(--about-rule);
}

.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.6vw, 30px);
}

@media (min-width: 920px) {
  .page-about .next-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.4fr) minmax(0, 0.85fr);
    align-items: center;
  }
}

.page-about .next-grid .h-sub {
  margin-top: 8px;
}

.page-about .next-copy {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 58ch;
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 团队区块 ---------- */
.page-about .team-block {
  padding-block: clamp(48px, 8vw, 100px);
}

.page-about .team-aside {
  margin-top: clamp(24px, 4vw, 8px);
}

.page-about .team-aside .media-frame {
  margin: 0;
}

.page-about .team-aside .annotation {
  margin: 14px 0 0;
  max-width: 34ch;
}

.page-about .lane-chart {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
}

.page-about .lane {
  padding: 18px 0 20px;
  border-top: 1px solid var(--about-rule);
}

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

.page-about .lane__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.page-about .lane__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .lane__num {
  font-size: 15px;
  font-weight: 600;
  color: var(--red);
}

.page-about .lane__bar {
  display: block;
  position: relative;
  height: 9px;
  margin: 12px 0 10px;
  background: var(--paper-2);
  overflow: hidden;
}

.page-about .lane__fill {
  display: block;
  height: 100%;
  background: var(--green-deep);
  transition: width 0.5s ease, background 0.25s ease;
}

.page-about .lane:hover .lane__fill {
  background: var(--red);
}

.page-about .lane__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 52ch;
}

/* ---------- 版本时间线 ---------- */
.page-about .timeline-head {
  padding-top: clamp(44px, 7vw, 88px);
  padding-bottom: clamp(30px, 4vw, 48px);
}

.page-about .timeline-fig {
  margin: clamp(28px, 4vw, 46px) 0 0;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  padding-block: clamp(36px, 6vw, 76px);
  border-top: 2px solid var(--red);
}

.page-about .tl-item--paper {
  background: var(--paper);
  color: var(--ink);
}

.page-about .tl-item--night {
  background: var(--night);
  color: var(--on-dark);
}

.page-about .tl-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 3vw, 34px);
}

@media (min-width: 860px) {
  .page-about .tl-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }
}

.page-about .tl-rail {
  display: flex;
  align-items: center;
  gap: 14px;
}

@media (min-width: 860px) {
  .page-about .tl-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    position: sticky;
    top: 96px;
    align-self: start;
  }
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--green-deep);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .tl-year:hover,
.page-about .tl-year:focus-visible {
  border-bottom-color: var(--red);
}

.page-about .tl-item--night .tl-year {
  color: var(--cyan);
}

.page-about .tl-node {
  width: 12px;
  height: 12px;
  flex: none;
  border-radius: 50%;
  background: var(--amber);
}

.page-about .tl-item--current .tl-node {
  background: var(--night);
  box-shadow: 0 0 0 3px var(--cyan);
}

.page-about .tl-body {
  max-width: 70ch;
}

.page-about .tl-tag {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--on-dark);
  background: var(--green-deep);
  border: 1px solid var(--green-line);
}

.page-about .tl-tag--wine {
  background: var(--wine);
  border-color: var(--wine);
}

.page-about .tl-body .h-sub {
  margin: 14px 0 12px;
}

.page-about .tl-body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .tl-item--night .tl-body p {
  color: var(--on-dark-soft);
}

.page-about .tl-note {
  font-size: 15px;
}

.page-about .tl-note .link-u {
  color: var(--cyan);
}

.page-about .tl-body .acc-item {
  margin-top: 22px;
  border-top: 1px solid var(--about-rule);
}

.page-about .tl-item--night .acc-item {
  border-top-color: rgba(244, 241, 232, 0.22);
}

.page-about .acc-btn__label {
  flex: 1;
  text-align: left;
  font-size: 15px;
  font-weight: 600;
}

.page-about .tl-item--night .acc-btn {
  color: var(--on-dark);
}

.page-about .tl-item--night .acc-panel__inner .prose,
.page-about .tl-item--night .acc-panel__inner li {
  color: var(--on-dark-soft);
}

/* ---------- 覆盖数据 ---------- */
.page-about .cover-band {
  padding-block: clamp(48px, 8vw, 96px);
}

.page-about .cover-stats {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 2px solid var(--green-deep);
}

@media (min-width: 780px) {
  .page-about .cover-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .cover-stat {
  padding: clamp(18px, 2.4vw, 30px) clamp(12px, 1.8vw, 22px);
  border-bottom: 1px solid var(--about-rule);
  border-right: 1px solid var(--about-rule);
}

.page-about .cover-stat__num {
  display: block;
  font-size: clamp(30px, 4.4vw, 52px);
  font-weight: 600;
  line-height: 1;
  color: var(--green-deep);
  padding-bottom: 8px;
  border-bottom: 3px solid var(--red);
}

.page-about .cover-stat__plus,
.page-about .cover-stat__unit {
  font-size: 0.5em;
  margin-left: 2px;
  vertical-align: 0.35em;
  color: var(--red);
}

.page-about .cover-stat__label {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.page-about .cover-link {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 62ch;
}

.page-about .cover-fig {
  margin: clamp(36px, 5vw, 60px) 0 0;
}

/* ---------- 资质 ---------- */
.page-about .cred-block {
  padding-block: clamp(48px, 8vw, 96px);
}

.page-about .cred-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.4vw, 28px);
  margin-top: clamp(26px, 4vw, 42px);
}

@media (min-width: 900px) {
  .page-about .cred-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
}

.page-about .cred-card {
  padding: clamp(20px, 2.4vw, 30px);
  background: var(--paper-2);
  border: var(--line);
  box-shadow: 6px 6px 0 rgba(11, 59, 46, 0.12);
}

.page-about .cred-card__no {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--red);
  letter-spacing: 0.1em;
}

.page-about .cred-card .h-sub {
  margin: 10px 0 12px;
}

.page-about .cred-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 合作放入 ---------- */
.page-about .join-band {
  padding-block: clamp(48px, 8vw, 96px);
  border-top: 2px solid var(--red);
}

.page-about .join-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 40px);
}

@media (min-width: 980px) {
  .page-about .join-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .join-actions,
  .page-about .join-note {
    grid-column: 1 / -1;
  }
}

.page-about .join-copy {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--on-dark-soft);
  max-width: 58ch;
}

.page-about .join-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .join-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--on-dark-soft);
  border-bottom: 1px solid rgba(244, 241, 232, 0.18);
}

.page-about .join-list li:first-child {
  border-top: 1px solid rgba(244, 241, 232, 0.18);
}

.page-about .join-list__k {
  flex: none;
  width: 26px;
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan);
}

.page-about .join-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .join-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--on-dark-mute);
  max-width: 68ch;
}

/* ---------- 图片容器兜底 ---------- */
.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 动效减弱 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .lane__fill,
  .page-about .tl-year {
    transition: none;
  }

  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
}