.page-about {
  --about-edge: rgba(201, 211, 204, 0.16);
  --about-text: rgba(247, 249, 245, 0.74);
  --about-shadow: 0 12px 28px rgba(5, 8, 7, 0.32);
  padding-bottom: 76px;
  overflow-x: clip;
}

.page-about [data-reveal] {
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.page-about [data-reveal-delay="120"] {
  transition-delay: 120ms;
}

.page-about [data-reveal-delay="240"] {
  transition-delay: 240ms;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  margin-bottom: 26px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  max-width: 22ch;
  font-size: clamp(1.9rem, 7.6vw, 4rem);
  line-height: 1.09;
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 58ch;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--about-text);
}

.page-about .about-hero::after {
  content: "";
  display: block;
  width: 72px;
  height: 4px;
  margin-top: 28px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--volt) 0%, rgba(215, 255, 63, 0.14) 100%);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  background: var(--about-edge);
  border: 1px solid var(--about-edge);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-facts__item {
  padding: 15px 16px 17px;
  background: var(--panel);
}

.page-about .about-facts__item dt {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--data);
  text-transform: uppercase;
}

.page-about .about-facts__item dd {
  margin: 8px 0 0;
  font-size: 0.92rem;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-facts__item dd .num {
  margin-right: 3px;
  font-family: var(--font-num);
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1;
  color: var(--volt);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-block {
  margin-top: 58px;
  padding-top: 34px;
  border-top: 1px solid var(--about-edge);
}

.page-about .about-block__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
}

.page-about .about-block__head .section__index {
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--volt);
}

.page-about .about-block__title {
  margin: 0;
  font-size: clamp(1.45rem, 5.2vw, 2.4rem);
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-block__lead {
  margin: 0 0 24px;
  max-width: 66ch;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--about-text);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 22px;
}

.page-about .about-split__main p {
  margin: 0 0 18px;
  font-size: 1rem;
  line-height: 1.92;
  color: var(--about-text);
}

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

.page-about .about-split__side {
  padding-left: 16px;
  border-left: 2px solid var(--volt);
}

.page-about .about-split__side .asidenote {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.88;
  color: var(--data);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 32px 0 0;
}

.page-about .about-figure .media__frame {
  overflow: hidden;
  border: 1px solid var(--about-edge);
  border-radius: var(--radius);
  background: var(--ink);
}

.page-about .about-figure .media__frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure .media__cap {
  margin-top: 12px;
  font-size: 0.82rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--data);
}

/* ---------- 协作链路 ---------- */
.page-about .flow {
  list-style: none;
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
}

.page-about .flow__step {
  position: relative;
  padding: 20px 18px 20px 62px;
  background: var(--panel);
  border: 1px solid var(--about-edge);
  border-radius: var(--radius);
  box-shadow: var(--about-shadow);
}

.page-about .flow__no {
  position: absolute;
  left: 18px;
  top: 21px;
  font-family: var(--font-num);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--volt);
}

.page-about .flow__name {
  margin: 0 0 8px;
  font-size: 1.04rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .flow__step p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--about-text);
}

/* ---------- 折叠旁注 ---------- */
.page-about .aside-drawer {
  margin-top: 20px;
  padding: 16px 18px;
  border: 1px solid var(--about-edge);
  border-radius: var(--radius);
  background: rgba(18, 37, 30, 0.62);
}

.page-about .aside-drawer > summary {
  display: flex;
  align-items: center;
  gap: 10px;
  list-style: none;
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--volt);
}

.page-about .aside-drawer > summary::-webkit-details-marker {
  display: none;
}

.page-about .aside-drawer > summary::before {
  content: "+";
  display: inline-block;
  width: 16px;
  font-family: var(--font-num);
  font-size: 1rem;
  color: var(--volt);
}

.page-about .aside-drawer[open] > summary::before {
  content: "−";
}

.page-about .aside-drawer p {
  margin: 12px 0 0;
  font-size: 0.9rem;
  line-height: 1.86;
  color: var(--about-text);
}

/* ---------- 纵向时间轴 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 4px 0 0;
  padding: 0 0 0 28px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--volt) 0%, rgba(215, 255, 63, 0.3) 55%, rgba(215, 255, 63, 0.05) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 32px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  box-sizing: border-box;
  width: 12px;
  height: 12px;
  border: 2px solid var(--volt);
  border-radius: 50%;
  background: var(--pitch);
}

.page-about .timeline__title {
  margin: 10px 0 8px;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .timeline__item p {
  margin: 0;
  max-width: 64ch;
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--about-text);
}

/* ---------- 合作生态 ---------- */
.page-about .eco {
  list-style: none;
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
}

.page-about .eco__item {
  padding: 20px 18px 22px;
  background: var(--panel);
  border: 1px solid var(--about-edge);
  border-radius: var(--radius);
}

.page-about .eco__tag {
  display: inline-block;
  margin-bottom: 12px;
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(215, 255, 63, 0.42);
  font-family: var(--font-num);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--volt);
}

.page-about .eco__item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .eco__note {
  margin: 26px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--ember);
  font-size: 0.9rem;
  line-height: 1.86;
  color: var(--data);
}

/* ---------- 选择理由 ---------- */
.page-about .reasons {
  list-style: none;
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
}

.page-about .reasons__item {
  padding: 18px 18px 20px;
  border: 1px solid var(--about-edge);
  border-left: 3px solid var(--grass);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(135deg, rgba(30, 122, 90, 0.18) 0%, rgba(18, 37, 30, 0.52) 100%);
}

.page-about .reasons__name {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .reasons__item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--about-text);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: 62px;
  padding: 30px 22px 34px;
  border: 1px solid rgba(215, 255, 63, 0.34);
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 10% 0%, rgba(215, 255, 63, 0.14) 0%, rgba(215, 255, 63, 0) 58%),
    linear-gradient(160deg, rgba(30, 122, 90, 0.32) 0%, rgba(10, 20, 40, 0.92) 100%);
}

.page-about .about-cta__title {
  margin: 10px 0 14px;
  font-size: clamp(1.4rem, 4.8vw, 2.2rem);
  line-height: 1.22;
  font-weight: 900;
  color: var(--paper);
}

.page-about .about-cta__text {
  max-width: 62ch;
  margin: 0 0 22px;
  font-size: 0.96rem;
  line-height: 1.88;
  color: var(--about-text);
}

.page-about .about-cta__text a {
  color: var(--volt);
  text-decoration: underline;
  text-decoration-color: rgba(215, 255, 63, 0.45);
  text-underline-offset: 3px;
}

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

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

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

  .page-about .about-facts__item {
    padding: 18px 18px 20px;
  }
}

@media (min-width: 840px) {
  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .reasons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 22px;
  }
}

@media (min-width: 800px) {
  .page-about .eco {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    padding-bottom: 34px;
  }

  .page-about .eco__item:nth-child(2) {
    transform: translateY(16px);
  }

  .page-about .eco__item:nth-child(3) {
    transform: translateY(32px);
  }
}

@media (min-width: 920px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .about-split__side {
    padding-left: 20px;
  }

  .page-about .about-block {
    margin-top: 68px;
    padding-top: 40px;
  }

  .page-about .about-cta {
    padding: 40px 40px 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about [data-reveal-delay] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .eco__item:nth-child(2),
  .page-about .eco__item:nth-child(3) {
    transform: none;
  }
}