.page-about {
  --about-year-size: clamp(2.6rem, 1.5rem + 3.6vw, 4.8rem);
  --about-strip: rgba(16, 35, 26, .66);
}

.page-about img {
  max-width: 100%;
}

.page-about .band--dark,
.page-about .band--night {
  color: var(--ink);
}

.page-about .band--turf,
.page-about .band--paper {
  color: var(--ink-dark);
}

.page-about .sec-head {
  max-width: 60ch;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -28%;
  left: 54%;
  width: 76%;
  height: 176%;
  background: linear-gradient(150deg, rgba(124, 179, 66, .32), rgba(198, 255, 0, .07) 42%, transparent 72%);
  transform: rotate(14deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: calc(var(--gap) * 1.2);
  align-items: end;
  padding-block: clamp(18px, 3vw, 34px) clamp(30px, 5vw, 66px);
}

.page-about .about-hero__kicker {
  margin: 18px 0 10px;
  font-size: var(--step--1);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--kiwi);
}

.page-about h1 {
  margin: 0;
  font-size: var(--step-4);
  line-height: 1.04;
  letter-spacing: -.02em;
  font-weight: 900;
  max-width: 22ch;
}

.page-about .about-hero__em {
  font-style: normal;
  color: var(--volt);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: var(--step-1);
  line-height: 1.72;
  color: var(--ink-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: calc(var(--gap) * .9);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__stats > .kpi {
  margin: 0;
  padding: clamp(12px, 2vw, 20px);
  background: rgba(16, 35, 26, .78);
}

.page-about .about-hero__stats .kpi__value {
  font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.4rem);
  line-height: 1.1;
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: calc(var(--gap) * 1.6);
  }
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline__cover {
  position: relative;
  height: clamp(170px, 26vw, 320px);
  overflow: hidden;
}

.page-about .about-timeline__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.78) contrast(1.06);
}

.page-about .about-timeline__cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(28, 28, 28, .32), rgba(16, 35, 26, .96));
}

.page-about .about-timeline__body {
  display: grid;
  gap: clamp(22px, 4vw, 54px);
  padding-block: clamp(26px, 4vw, 54px) clamp(36px, 6vw, 84px);
}

.page-about .about-timeline__spy-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.page-about .spy__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  color: var(--ink-dim);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  text-decoration: none;
  white-space: nowrap;
  transition: color .16s var(--ease), border-color .16s var(--ease), background-color .16s var(--ease);
}

.page-about .spy__link:hover,
.page-about .spy__link:focus-visible {
  color: var(--volt);
  border-color: var(--line-strong);
  background: rgba(124, 179, 66, .12);
}

.page-about .spy__num {
  color: var(--kiwi);
  font-size: var(--step--1);
}

.page-about .about-tl {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}

.page-about .tl-item {
  padding-top: clamp(16px, 2.4vw, 28px);
  border-top: 1px solid var(--line);
}

.page-about .tl-item:first-of-type {
  padding-top: 0;
  border-top: none;
}

.page-about .tl-year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: var(--about-year-size);
  line-height: .92;
  letter-spacing: -.03em;
  color: var(--kiwi);
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-size: var(--step-2);
  letter-spacing: -.01em;
}

.page-about .tl-text {
  margin: 0;
  max-width: 62ch;
  line-height: 1.78;
  color: var(--ink-dim);
}

@media (min-width: 960px) {
  .page-about .about-timeline__body {
    grid-template-columns: 168px minmax(0, 1fr);
  }

  .page-about .about-timeline__spy {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-timeline__spy-list {
    flex-direction: column;
    overflow: visible;
  }

  .page-about .spy__link {
    width: 100%;
  }
}

@media (min-width: 1100px) {
  .page-about .tl-item:nth-of-type(even) {
    margin-left: clamp(20px, 6vw, 92px);
  }
}

/* ---------- 团队 ---------- */

.page-about .about-team__inner {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  padding-block: clamp(30px, 5vw, 74px);
}

.page-about .about-team__lead {
  margin: 14px 0 0;
  max-width: 62ch;
  line-height: 1.76;
  color: #3F4A42;
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}

.page-about .team-role {
  border: 1px solid rgba(28, 28, 28, .16);
  background: var(--paper);
  border-left: 4px solid var(--kiwi);
}

.page-about .team-role + .team-role {
  margin-top: 10px;
}

.page-about .team-role > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  font-weight: 800;
  color: var(--ink-dark);
}

.page-about .team-role > summary::-webkit-details-marker,
.page-about .flow-step > summary::-webkit-details-marker {
  display: none;
}

.page-about .team-role__name {
  flex: 1 1 auto;
}

.page-about .team-role__count {
  font-size: var(--step--1);
  color: var(--ink-dark-dim);
}

.page-about .team-role > summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--kiwi);
}

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

.page-about .team-role p {
  margin: 0;
  padding: 0 16px 16px;
  line-height: 1.76;
  color: #3F4A42;
}

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

.page-about .about-team__pic img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    align-items: start;
  }
}

/* 四步流程 */

.page-about .about-flow {
  display: grid;
  gap: 14px;
}

.page-about .about-flow__head {
  margin: 0;
  font-size: var(--step--1);
  letter-spacing: .18em;
  color: var(--ink-dark-dim);
}

.page-about .about-flow__steps {
  display: grid;
  gap: 1px;
  background: rgba(28, 28, 28, .16);
  border: 1px solid rgba(28, 28, 28, .16);
}

.page-about .flow-step {
  margin: 0;
  background: var(--turf);
}

.page-about .flow-step > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  font-weight: 800;
  color: var(--ink-dark);
}

.page-about .flow-step__num {
  font-size: var(--step--1);
  color: var(--kiwi);
}

.page-about .flow-step p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: var(--step--1);
  line-height: 1.72;
  color: #3F4A42;
}

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

/* ---------- 档案规模 ---------- */

.page-about .about-archive__inner {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  padding-block: clamp(30px, 5vw, 74px);
}

.page-about .about-archive__figures {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .fig {
  padding: clamp(16px, 2.4vw, 28px);
  background: var(--about-strip);
}

.page-about .fig__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 1.6rem + 3vw, 4.4rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--volt);
}

.page-about .fig__unit {
  display: block;
  margin-top: 10px;
  font-size: var(--step-0);
  line-height: 1.6;
  color: var(--ink-dim);
}

.page-about .data-table caption {
  text-align: left;
  padding-bottom: 12px;
  font-size: var(--step--1);
  color: var(--ink-dim);
}

.page-about .about-archive__note {
  margin: 0;
  max-width: 66ch;
  line-height: 1.76;
}

@media (min-width: 760px) {
  .page-about .about-archive__figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 协作网络 ---------- */

.page-about .about-network__inner {
  display: grid;
  gap: clamp(20px, 3.4vw, 44px);
  padding-block: clamp(30px, 5vw, 74px);
}

.page-about .about-network__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-network__list li {
  display: grid;
  gap: 5px;
  padding-left: 14px;
  border-left: 3px solid var(--kiwi);
}

.page-about .about-network__list strong {
  font-size: var(--step-1);
  color: var(--ink-dark);
}

.page-about .about-network__list span {
  line-height: 1.74;
  color: #4B5563;
}

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

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

@media (min-width: 960px) {
  .page-about .about-network__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
  }
}

/* ---------- 阶段报告 ---------- */

.page-about .about-reports__inner {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  padding-block: clamp(30px, 5vw, 74px);
}

.page-about .about-reports .timeline__round {
  color: var(--kiwi);
}

.page-about .about-reports .timeline__title {
  color: var(--ink-dark);
}

.page-about .about-reports .timeline__meta {
  color: #4B5563;
}

/* ---------- 收束 ---------- */

.page-about .about-why {
  position: relative;
  overflow: hidden;
}

.page-about .about-why::before {
  content: "";
  position: absolute;
  bottom: -40%;
  left: -12%;
  width: 60%;
  height: 150%;
  background: linear-gradient(24deg, rgba(124, 179, 66, .22), transparent 68%);
  transform: rotate(-9deg);
  pointer-events: none;
}

.page-about .about-why__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  padding-block: clamp(34px, 5.5vw, 84px);
}

.page-about .about-why__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-why__list li {
  padding: clamp(16px, 2.2vw, 26px);
  background: var(--about-strip);
}

.page-about .about-why__list h3 {
  margin: 0 0 8px;
  font-size: var(--step-1);
}

.page-about .about-why__list p {
  margin: 0;
  line-height: 1.74;
  color: var(--ink-dim);
}

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

.page-about .about-why__note {
  margin: 0;
  max-width: 66ch;
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--ink-dim);
}

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