.page-about {
  --about-notch: 16px;
  --about-hair: rgba(14, 122, 107, .22);
  --about-ink-soft: rgba(42, 59, 69, .78);
  display: block;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  padding-block: clamp(26px, 4.5vw, 54px) clamp(18px, 3vw, 30px);
}

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

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-grass);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2vw, 24px);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--c-navy);
  max-width: 16em;
}

.page-about .about-hero__lead-text {
  margin: 0;
  max-width: 42em;
  font-size: clamp(15.5px, 1.15vw, 17px);
  line-height: 1.8;
  color: var(--c-ink);
}

.page-about .about-hero__aside {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-left: 18px;
  border-left: 3px solid var(--c-grass);
}

.page-about .about-hero__annotation {
  margin: 0;
  max-width: 24em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .about-hero__stats {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-hero__stats li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-hero__stats .mono {
  font-family: var(--font-mono);
  font-size: clamp(19px, 2vw, 24px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--c-grass-deep);
}

.page-about .about-hero__stats em {
  font-style: normal;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--about-ink-soft);
}

.page-about .about-hero__figure {
  margin: clamp(22px, 3.4vw, 40px) 0 0;
}

/* ============ 通用图片容器 ============ */
.page-about .img-frame {
  overflow: hidden;
}

.page-about .img-frame--21x9 { aspect-ratio: 21 / 9; }
.page-about .img-frame--16x9 { aspect-ratio: 16 / 9; }
.page-about .img-frame--4x3  { aspect-ratio: 4 / 3; }

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

/* ============ 章节与分栏 ============ */
.page-about .about-section {
  padding-block: clamp(34px, 5.4vw, 66px);
}

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .about-split__aside {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: flex-start;
}

.page-about .about-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 500;
  color: var(--c-paper);
  background: var(--c-grass);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
}

.page-about .about-aside-note {
  margin: 0;
  max-width: 22em;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

.page-about .about-split__body h2 {
  margin: 0 0 clamp(14px, 1.8vw, 22px);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--c-navy);
}

.page-about .about-split__body > p {
  margin: 0 0 16px;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-ink);
}

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

.page-about .about-duo {
  display: grid;
  gap: 0;
}

.page-about .about-duo p {
  margin: 0 0 16px;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-ink);
}

@media (min-width: 760px) {
  .page-about .about-duo {
    grid-template-columns: 1fr 1fr;
    column-gap: clamp(26px, 3.4vw, 48px);
    row-gap: 0;
  }
}

/* ============ 栏目族卡片 ============ */
.page-about .family-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-about .family-card {
  background: var(--c-mint);
  border-top: 4px solid var(--c-grass);
  padding: 20px 18px 24px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .family-card__tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--c-grass-deep);
}

.page-about .family-card h3 {
  margin: 10px 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.25;
  color: var(--c-navy);
}

.page-about .family-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--c-ink);
}

.page-about .rhythm-bar {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding: 14px 18px;
  background: var(--c-orange-soft);
  border-left: 4px solid var(--c-orange);
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--c-navy);
}

/* ============ 版本时间轴 ============ */
.page-about .about-timeline {
  position: relative;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 25px;
  top: 30px;
  bottom: 30px;
  width: 0;
  border-left: 2px dashed rgba(14, 122, 107, .38);
}

.page-about .tl-item {
  position: relative;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .tl-item:first-child {
  border-top: 1px solid var(--about-hair);
}

.page-about .tl-sum {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-sum::-webkit-details-marker { display: none; }

.page-about .tl-sum:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: 4px;
}

.page-about .tl-node {
  position: relative;
  z-index: 1;
  flex: 0 0 auto;
  width: 52px;
  height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--c-paper);
  background: var(--c-grass);
  clip-path: polygon(0 0, calc(100% - 13px) 0, 100% 13px, 100% 100%, 13px 100%, 0 calc(100% - 13px));
  transition: background-color .2s ease;
}

.page-about .tl-item[open] .tl-node {
  background: var(--c-orange);
}

.page-about .tl-head {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .tl-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(16.5px, 1.6vw, 20px);
  line-height: 1.3;
  color: var(--c-navy);
}

.page-about .tl-sub {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-grass);
}

.page-about .tl-mark {
  position: relative;
  flex: 0 0 auto;
  margin-left: auto;
  width: 20px;
  height: 20px;
}

.page-about .tl-mark::before,
.page-about .tl-mark::after {
  content: "";
  position: absolute;
  background: var(--c-grass-deep);
  transition: transform .2s ease;
}

.page-about .tl-mark::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  margin-top: -1px;
}

.page-about .tl-mark::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  margin-left: -1px;
}

.page-about .tl-item[open] .tl-mark::after {
  transform: scaleY(0);
}

.page-about .tl-body {
  padding: 0 0 20px;
}

.page-about .tl-body p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-ink);
}

/* ============ 团队 ============ */
.page-about .about-team__intro {
  margin-bottom: clamp(18px, 2.4vw, 26px) !important;
}

.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 30px);
  align-items: start;
}

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

.page-about .role-card {
  background: var(--c-paper);
  border: 1px solid rgba(20, 32, 74, .12);
  border-left: 4px solid var(--c-grass);
  padding: 18px 18px 20px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .role-card__meta {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--c-grass);
}

.page-about .role-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.3;
  color: var(--c-navy);
}

.page-about .role-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-ink);
}

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

/* ============ 资质徽章 ============ */
.page-about .cred-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(18px, 2.4vw, 26px);
}

.page-about .cred-badge {
  background: var(--c-navy);
  color: var(--c-paper);
  padding: 24px 22px 26px;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

.page-about .cred-badge__label {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--c-lime);
}

.page-about .cred-badge__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(19px, 1.9vw, 22px);
  line-height: 1.22;
  color: var(--c-paper);
}

.page-about .cred-badge p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(247, 250, 249, .84);
}

/* ============ 协作生态 ============ */
.page-about .partner-band {
  width: 100%;
  margin-top: clamp(24px, 3.6vw, 44px);
  padding-block: clamp(26px, 3.6vw, 46px);
  padding-inline: var(--gutter);
  gap: clamp(14px, 2vw, 22px);
  background: var(--c-navy);
}

.page-about .partner-stat {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 20px;
  border-left: 3px solid var(--c-orange);
  background: rgba(255, 255, 255, .06);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .partner-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-lime);
}

.page-about .partner-stat__num small {
  margin-left: 4px;
  font-size: .42em;
  color: rgba(247, 250, 249, .8);
}

.page-about .partner-stat__label {
  margin: 0;
  font-size: 14px;
  line-height: 1.66;
  color: rgba(247, 250, 249, .88);
}

.page-about .about-region {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
}

/* ============ 结尾行动区 ============ */
.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 68px);
  padding-block: clamp(34px, 5vw, 62px);
  background: var(--c-grass-deep);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--c-paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(247, 250, 249, .84);
}

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

.page-about .about-cta .btn--ghost {
  border-color: rgba(247, 250, 249, .48);
  color: var(--c-paper);
}

.page-about .about-cta .btn--ghost:hover,
.page-about .about-cta .btn--ghost:focus-visible {
  border-color: var(--c-paper);
  color: var(--c-paper);
}

/* ============ 响应式 ============ */
@media (min-width: 620px) {
  .page-about .family-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .cred-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .team-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .tl-body {
    padding-left: 68px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(230px, 310px);
    gap: clamp(30px, 4vw, 64px);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(150px, 1fr) minmax(0, 2.4fr);
    gap: clamp(28px, 3.6vw, 60px);
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: center;
    gap: clamp(30px, 4vw, 70px);
  }
}

@media (min-width: 1080px) {
  .page-about .family-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .cred-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node,
  .page-about .tl-mark::before,
  .page-about .tl-mark::after {
    transition: none;
  }
}
</PAGE_CSS>