.page-about {
  --about-line: rgba(107, 74, 43, .28);
  --about-gap: clamp(20px, 4vw, 44px);
  --about-soft: rgba(25, 24, 19, .78);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .media-frame {
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .section-head {
  max-width: 62ch;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .section-title {
  font-size: clamp(24px, 4.2vw, 40px);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.16;
  margin: 8px 0 12px;
}

.page-about .section-lead {
  margin: 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--about-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: var(--about-gap);
  padding-block: clamp(18px, 3vw, 36px) clamp(28px, 4vw, 52px);
}

.page-about .hero-title {
  font-size: clamp(30px, 7vw, 64px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -.02em;
  margin: 10px 0 16px;
}

.page-about .hero-sub {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.78;
  color: var(--seed);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .hero-facts {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  background: var(--skin);
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .hero-facts::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 72px;
  height: 6px;
  background: var(--kiwi-glow);
}

.page-about .facts-title {
  margin: 8px 0 0;
  font-size: 12px;
  letter-spacing: .32em;
  color: var(--kiwi-glow);
}

.page-about .facts-list {
  margin: 12px 0 0;
}

.page-about .facts-list dd {
  margin: 0;
}

.page-about .fact-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(245, 240, 225, .24);
}

.page-about .fact-row:last-child {
  border-bottom: 0;
}

.page-about .fact-label {
  font-size: 14px;
  color: rgba(245, 240, 225, .76);
}

.page-about .fact-num {
  font-family: var(--font-num);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  color: var(--paper);
}

/* ---------- 时间轴 ---------- */
.page-about .tl-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  gap: 8px;
  padding: clamp(20px, 3vw, 32px) 0;
  border-top: 1px solid var(--about-line);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 14px;
  height: 9px;
  border-radius: 50%;
  background: var(--skin-light);
}

.page-about .tl-year {
  margin: 0;
  font-family: var(--font-num);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: .08em;
  color: var(--kiwi-core);
}

.page-about .tl-figure {
  margin: 0 0 16px;
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 800;
  line-height: 1.3;
}

.page-about .tl-text {
  margin: 0;
  max-width: 36em;
  line-height: 1.78;
  color: var(--about-soft);
}

/* ---------- 团队 ---------- */
.page-about .team-block {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

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

.page-about .team-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 12px;
}

.page-about .team-card {
  grid-column: span 12;
  position: relative;
  padding: 18px 18px 20px;
  background: var(--paper-light);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background var(--dur), transform var(--dur);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--kiwi-flesh);
}

.page-about .team-card:hover {
  background: var(--pale-green);
  transform: translate(2px, -2px);
}

.page-about .team-name {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin: 0;
  font-size: 18px;
  font-weight: 800;
}

.page-about .team-count {
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 700;
  color: var(--deep-teal);
}

.page-about .team-desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-soft);
}

.page-about .data-squad {
  margin-top: 16px;
  padding: 20px;
  background: var(--seed);
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .data-squad-title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  color: var(--kiwi-glow);
}

.page-about .data-squad p {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 240, 225, .86);
}

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

/* ---------- 版本 ---------- */
.page-about .ver-grid {
  display: grid;
  gap: 16px;
}

.page-about .ver-card {
  padding: 22px 20px 22px;
  background: var(--paper-light);
  border-top: 6px solid var(--kiwi-flesh);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: transform var(--dur);
}

.page-about .ver-card:hover {
  transform: translateY(-3px);
}

.page-about .ver-card--v1 {
  border-top-color: var(--skin-light);
}

.page-about .ver-card--v2 {
  border-top-color: var(--deep-teal);
}

.page-about .ver-tag {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  background: var(--pale-green);
  color: var(--seed);
}

.page-about .ver-year {
  margin: 14px 0 2px;
  font-family: var(--font-num);
  font-size: 30px;
  font-weight: 800;
  color: var(--seed);
}

.page-about .ver-sub {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
}

.page-about .ver-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
}

/* ---------- 合作 ---------- */
.page-about .coop-panel {
  display: grid;
  gap: clamp(24px, 3vw, 42px);
  padding: clamp(24px, 4vw, 54px);
  background: var(--skin);
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

.page-about .eyebrow--light {
  color: var(--kiwi-glow);
}

.page-about .coop-panel h2 {
  margin: 10px 0 14px;
  font-size: clamp(23px, 3.4vw, 36px);
  font-weight: 900;
  line-height: 1.2;
  color: var(--paper);
}

.page-about .coop-panel p {
  margin: 0 0 20px;
  max-width: 40em;
  line-height: 1.8;
  color: rgba(245, 240, 225, .86);
}

.page-about .coop-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.page-about .coop-stats li {
  padding-left: 12px;
  border-left: 2px solid var(--kiwi-flesh);
}

.page-about .coop-num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--kiwi-glow);
}

.page-about .coop-label {
  font-size: 13px;
  color: rgba(245, 240, 225, .8);
}

/* ---------- 本地访问 ---------- */
.page-about .access-grid {
  display: grid;
  gap: clamp(22px, 3vw, 38px);
}

.page-about .access-lead {
  margin: 0;
  max-width: 36em;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .access-list {
  list-style: none;
  margin: 18px 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .access-list li {
  padding: 6px 16px;
  border-radius: var(--pill);
  background: var(--pale-green);
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 700;
  color: var(--seed);
}

.page-about .access-note {
  margin: 0;
  padding-left: 14px;
  border-left: 3px solid var(--print-orange);
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
}

.page-about .access-figure {
  margin: 0;
}

/* ---------- 荣誉 ---------- */
.page-about .honor-grid {
  display: grid;
  gap: 18px;
}

.page-about .honor-card {
  padding: 24px 22px;
  background: var(--pale-green);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .honor-year {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(34px, 5vw, 48px);
  font-weight: 800;
  line-height: 1;
  color: var(--deep-teal);
}

.page-about .honor-name {
  margin: 12px 0 10px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.45;
}

.page-about .honor-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
}

.page-about .milestone {
  padding: 14px 0;
  border-top: 1px solid var(--about-line);
}

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

.page-about .milestone summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 800;
  list-style: none;
  transition: color var(--dur);
}

.page-about .milestone summary:hover {
  color: var(--kiwi-core);
}

.page-about .milestone summary::-webkit-details-marker {
  display: none;
}

.page-about .milestone summary::after {
  content: "+";
  font-family: var(--font-num);
  font-weight: 800;
  color: var(--kiwi-core);
}

.page-about .milestone[open] summary::after {
  content: "–";
}

.page-about .milestone p {
  margin: 10px 0 0;
  max-width: 40em;
  line-height: 1.78;
  color: var(--about-soft);
}

/* ---------- 下一步 ---------- */
.page-about .next-grid {
  display: grid;
  gap: 16px;
}

.page-about .next-card {
  padding: 22px 20px;
  background: var(--paper-light);
  border-top: 4px solid var(--seed);
}

.page-about .next-no {
  display: block;
  font-family: var(--font-num);
  font-size: 34px;
  font-weight: 800;
  line-height: 1;
  color: var(--kiwi-flesh);
}

.page-about .next-card h3 {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 800;
}

.page-about .next-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
}

/* ---------- 行动通道 ---------- */
.page-about .cta-strip {
  margin-top: clamp(30px, 5vw, 62px);
  background: var(--kiwi-flesh);
  color: var(--seed);
}

.page-about .cta-strip-inner {
  display: grid;
  gap: 16px;
  padding-block: clamp(26px, 4vw, 46px);
}

.page-about .cta-strip h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 900;
  line-height: 1.2;
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .cta-strip .btn-ghost {
  border-color: var(--seed);
  color: var(--seed);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .team-card {
    grid-column: span 6;
  }

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

@media (min-width: 860px) {
  .page-about .tl-item {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: clamp(18px, 3vw, 46px);
    align-items: start;
  }

  .page-about .tl-year {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    min-height: 112px;
    font-size: clamp(30px, 3vw, 40px);
    letter-spacing: .22em;
    color: var(--skin);
  }

  .page-about .team-block {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

  .page-about .honor-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

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

  .page-about .coop-panel {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .access-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

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

  .page-about .cta-strip-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1060px) {
  .page-about .team-card--third {
    grid-column: span 4;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .ver-card,
  .page-about .milestone summary {
    transition: none;
  }

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