.page-about {
  --about-rail-m: 28px;
  --about-year-col: 172px;
  --about-year-gap: 44px;
  --about-rail: calc(var(--about-year-col) + var(--about-year-gap) / 2);
  --about-muted: rgba(247, 245, 239, .74);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background-color: var(--paper);
  background-image: repeating-linear-gradient(90deg, rgba(11, 110, 60, .06) 0 2px, transparent 2px 46px);
  border-bottom: var(--bd);
  padding-top: clamp(16px, 2.6vw, 28px);
  padding-bottom: clamp(30px, 5vw, 64px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -140px;
  right: -180px;
  width: min(620px, 62vw);
  height: min(620px, 62vw);
  background: radial-gradient(circle at 32% 68%, rgba(30, 158, 99, .24), rgba(216, 243, 74, .1) 46%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(18px, 3vw, 34px);
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, .88fr);
    align-items: end;
    gap: clamp(36px, 5vw, 72px);
  }
}

.page-about .about-eyebrow {
  margin: 0 0 12px;
  color: var(--turf);
}

.page-about .about-h1 {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(38px, 7.6vw, 84px);
  line-height: .96;
  letter-spacing: -.01em;
  color: var(--ink);
  text-wrap: balance;
}

.page-about .about-lede {
  margin: 0 0 14px;
  max-width: 58ch;
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.82;
  color: #1d4132;
}

.page-about .about-hero-note {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.8;
  color: #3f6354;
  padding-left: 14px;
  border-left: var(--bd-thin);
}

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

/* 首屏数据卡 */
.page-about .about-facts {
  margin: 0;
  border: var(--bd);
  background: #fff;
  box-shadow: var(--shadow);
  padding: clamp(16px, 2.4vw, 24px);
  display: grid;
  gap: 0;
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(5, 46, 28, .24);
}

.page-about .about-fact:first-child {
  padding-top: 0;
}

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

.page-about .about-fact dt {
  font-size: 13px;
  letter-spacing: .06em;
  color: #3f6354;
}

.page-about .about-fact dd {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.01em;
  white-space: nowrap;
}

/* 章节预览条 */
.page-about .about-chapters {
  margin-top: clamp(28px, 4vw, 46px);
  border-top: var(--bd);
  padding-top: 10px;
}

.page-about .about-chapters ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(10px, 2vw, 22px);
}

@media (min-width: 780px) {
  .page-about .about-chapters ol {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.page-about .about-chapters a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 11px 4px;
  text-decoration: none;
  color: var(--ink);
  border-bottom: var(--bd-thin);
  transition: background-color .18s var(--ease), padding-left .18s var(--ease);
}

.page-about .about-chapters a:hover,
.page-about .about-chapters a:focus-visible {
  background: var(--lemon-mist);
  padding-left: 12px;
}

.page-about .about-ch-num {
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--turf);
}

.page-about .about-ch-label {
  font-family: var(--f-display);
  font-size: 15px;
  letter-spacing: .04em;
}

/* ============ 时间线 ============ */
.page-about .about-timeline-section {
  background: var(--paper);
}

.page-about .about-timeline-figure {
  margin: 0 0 clamp(30px, 4.5vw, 54px);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--about-rail-m);
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 42px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: var(--bd-w);
  background: var(--ink);
}

.page-about .about-tl-item {
  position: relative;
  display: grid;
  gap: 6px;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  top: 5px;
  left: calc(1.5px - var(--about-rail-m) - 7px);
  width: 14px;
  height: 14px;
  background: var(--lemon);
  border: var(--bd-thin);
}

.page-about .about-tl-item--now::before {
  background: var(--whistle);
}

.page-about .about-tl-year {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(28px, 7vw, 44px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--turf);
}

.page-about .about-tl-title {
  margin: 0 0 6px;
  font-family: var(--f-display);
  font-size: clamp(17px, 2.3vw, 21px);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-tl-text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: #25483a;
}

@media (min-width: 860px) {
  .page-about .about-timeline {
    padding-left: 0;
    gap: 0;
  }

  .page-about .about-timeline::before {
    left: calc(var(--about-rail) - 1.5px);
    top: 12px;
    bottom: 12px;
  }

  .page-about .about-tl-item {
    grid-template-columns: var(--about-year-col) minmax(0, 1fr);
    column-gap: var(--about-year-gap);
    padding-bottom: clamp(30px, 3.4vw, 46px);
  }

  .page-about .about-tl-item:last-child {
    padding-bottom: 0;
  }

  .page-about .about-tl-item::before {
    top: 10px;
    left: calc(var(--about-rail) - 7px);
  }

  .page-about .about-tl-year {
    font-size: clamp(38px, 4.4vw, 60px);
  }
}

/* ============ 团队 ============ */
.page-about .about-team {
  background: var(--night);
  color: var(--paper);
}

.page-about .about-team .section-title {
  color: var(--paper);
}

.page-about .about-team .section-lead {
  color: var(--about-muted);
}

.page-about .about-team .section-num {
  color: var(--lemon);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
  margin-top: clamp(24px, 3.5vw, 40px);
}

@media (min-width: 900px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
    gap: clamp(32px, 4.5vw, 60px);
  }

  .page-about .about-team-figure {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    margin: 0;
  }
}

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

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 2vw, 22px);
  padding: clamp(14px, 2vw, 20px);
  border: 2px solid rgba(247, 245, 239, .28);
  background: rgba(247, 245, 239, .05);
  transition: transform .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-color: var(--lemon);
  background: rgba(216, 243, 74, .09);
  transform: translate(-3px, -3px);
}

.page-about .about-role-num {
  flex: 0 0 auto;
  font-family: var(--f-mono);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  color: var(--lemon);
}

.page-about .about-role-body {
  min-width: 0;
}

.page-about .about-role-name {
  margin: 0 0 5px;
  font-family: var(--f-display);
  font-size: 18px;
  letter-spacing: .05em;
  color: var(--paper);
}

.page-about .about-role-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--about-muted);
}

/* ============ 更新能力 ============ */
.page-about .about-capability {
  background: var(--paper);
}

.page-about .about-cap-grid {
  margin-top: clamp(20px, 3vw, 34px);
  border-top: var(--bd);
}

.page-about .about-cap {
  border-bottom: var(--bd);
  padding: clamp(20px, 3vw, 32px) 0;
  display: grid;
  gap: 8px;
}

@media (min-width: 800px) {
  .page-about .about-cap {
    grid-template-columns: 76px minmax(170px, 230px) minmax(0, 1fr);
    align-items: baseline;
    column-gap: clamp(18px, 3vw, 44px);
    padding: clamp(22px, 2.6vw, 34px) 0;
  }

  .page-about .about-cap-num {
    grid-row: 1;
    grid-column: 1;
  }

  .page-about .about-cap-title {
    grid-row: 1;
    grid-column: 2;
    margin: 0;
  }

  .page-about .about-cap-text {
    grid-row: 1;
    grid-column: 3;
    margin: 0;
  }
}

.page-about .about-cap-num {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--turf);
}

.page-about .about-cap-title {
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-cap-text {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.78;
  color: #25483a;
}

/* ============ 合作生态 ============ */
.page-about .about-partners {
  position: relative;
  overflow: hidden;
  background: var(--turf);
  color: var(--paper);
}

.page-about .about-partners-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-partners .section-title {
  color: var(--paper);
}

.page-about .about-partners .section-lead {
  color: rgba(247, 245, 239, .82);
}

.page-about .about-partners .section-num {
  color: var(--lemon);
}

.page-about .about-partner-diagram {
  position: absolute;
  top: -60px;
  right: -70px;
  width: min(420px, 58vw);
  color: rgba(247, 245, 239, .16);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-partner-diagram svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-partner-grid {
  list-style: none;
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

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

@media (min-width: 1080px) {
  .page-about .about-partner-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.page-about .about-partner {
  border: 2px solid rgba(247, 245, 239, .34);
  background: rgba(5, 46, 28, .26);
  padding: clamp(14px, 2vw, 20px);
  display: grid;
  gap: 6px;
  align-content: start;
  transition: background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-partner:hover {
  background: rgba(5, 46, 28, .42);
  border-color: var(--lemon);
}

.page-about .about-partner-num {
  font-family: var(--f-mono);
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--lemon);
}

.page-about .about-partner-name {
  margin: 0;
  font-family: var(--f-display);
  font-size: 16px;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .about-partner-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(247, 245, 239, .8);
}

.page-about .about-partners-figure {
  margin: clamp(26px, 3.6vw, 44px) 0 0;
}

.page-about .about-partners-cta {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  gap: 16px;
  align-items: center;
  border-top: 2px solid rgba(247, 245, 239, .34);
  padding-top: clamp(18px, 2.4vw, 26px);
}

@media (min-width: 760px) {
  .page-about .about-partners-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: clamp(24px, 4vw, 56px);
  }
}

.page-about .about-partners-note {
  margin: 0;
  max-width: 70ch;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(247, 245, 239, .88);
}

.page-about .about-partners-btn {
  justify-self: start;
}

@media (min-width: 760px) {
  .page-about .about-partners-btn {
    justify-self: end;
  }
}

/* ============ 做事原则 ============ */
.page-about .about-principles-section {
  background: var(--paper);
}

.page-about .about-principles {
  list-style: none;
  margin: clamp(22px, 3vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.2vw, 22px);
}

@media (min-width: 760px) {
  .page-about .about-principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-principle {
  position: relative;
  border: var(--bd);
  background: #fff;
  box-shadow: var(--shadow-sm);
  padding: clamp(18px, 2.6vw, 28px);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .about-principle:hover {
  transform: translate(-4px, -4px);
  box-shadow: var(--shadow);
}

.page-about .about-principle-num {
  margin: 0 0 10px;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--whistle);
}

.page-about .about-principle-title {
  margin: 0 0 8px;
  font-family: var(--f-display);
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.32;
  color: var(--ink);
}

.page-about .about-principle-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #25483a;
}

/* ============ 结尾 ============ */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  border-top: var(--bd);
  padding: clamp(34px, 5vw, 64px) 0;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(90deg, rgba(216, 243, 74, .06) 0 2px, transparent 2px 54px);
  pointer-events: none;
}

.page-about .about-cta-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  align-items: center;
}

@media (min-width: 820px) {
  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: clamp(32px, 5vw, 72px);
  }
}

.page-about .about-cta-eyebrow {
  margin: 0 0 10px;
  color: var(--lemon);
}

.page-about .about-cta-title {
  margin: 0 0 10px;
  font-family: var(--f-display);
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.16;
  color: var(--paper);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(247, 245, 239, .8);
}

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

@media (min-width: 820px) {
  .page-about .about-cta-actions {
    flex-direction: column;
    align-items: flex-start;
    min-width: 200px;
  }
}

.page-about .about-cta .btn-ghost {
  color: var(--paper);
  border-color: rgba(247, 245, 239, .6);
}

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

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

.page-about .about-timeline-figure img,
.page-about .about-team-figure img,
.page-about .about-partners-figure img {
  max-width: 100%;
}

/* ============ 无障碍动效 ============ */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-principle,
  .page-about .about-chapters a,
  .page-about .about-partner {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-principle:hover {
    transform: none;
  }
}
</main>