.page-about {
  background: var(--warm);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--green-deep);
  color: var(--warm);
  overflow: hidden;
}

.page-about .about-hero__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(to right, rgba(246, 242, 231, .07) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(to bottom, rgba(246, 242, 231, .07) 0 1px, transparent 1px 72px);
}

.page-about .about-hero__inner {
  position: relative;
  padding-block: var(--s5) var(--s6);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: var(--s5);
  font-size: 13px;
  color: var(--rock);
}

.page-about .about-hero .breadcrumb a {
  color: var(--warm);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover {
  color: var(--lime);
}

.page-about .about-hero__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--lime);
  margin: 0 0 var(--s3);
}

.page-about .about-hero__title {
  font-size: clamp(52px, 11vw, 120px);
  line-height: .95;
  font-weight: 300;
  letter-spacing: -.02em;
  margin: 0 0 var(--s4);
}

.page-about .about-hero__lead {
  max-width: 40em;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(246, 242, 231, .82);
  margin: 0 0 var(--s5);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .about-hero__stat {
  background: var(--green-deep);
  padding: var(--s3);
}

.page-about .about-hero__numeral {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-hero__statlabel {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--rock);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 43, 34, .78), rgba(11, 43, 34, .28));
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: clamp(190px, 32vw, 420px);
  object-fit: cover;
  filter: saturate(.85);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: var(--s5);
  padding-block: var(--s6);
}

.page-about .about-index {
  border-bottom: 1px solid var(--rule-dark);
  padding-bottom: var(--s2);
}

.page-about .about-index__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--rock);
  margin: 0 0 var(--s2);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 var(--s2);
  display: flex;
  gap: var(--s3);
  overflow-x: auto;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-index__list a:hover {
  color: var(--moss);
  border-bottom-color: var(--moss);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--moss);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  border-top: 1px solid var(--rule-dark);
  padding-top: var(--s4);
  scroll-margin-top: calc(var(--topbar-h) + 20px);
}

.page-about .about-sec + .about-sec {
  margin-top: var(--s6);
}

.page-about .about-sec__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--lime);
  background: var(--green-deep);
  padding: 5px 10px;
}

.page-about .about-sec__title {
  font-size: clamp(28px, 4.4vw, 46px);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -.01em;
  margin: var(--s3) 0 var(--s3);
}

.page-about .about-sec__lead {
  max-width: 40em;
  font-size: 16.5px;
  line-height: 1.78;
  color: rgba(20, 22, 26, .72);
  margin: 0 0 var(--s4);
}

.page-about .about-sec p {
  max-width: 44em;
  line-height: 1.78;
}

.page-about .about-sec h3 {
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  margin: 0 0 var(--s1);
}

/* ---------- A-01 ---------- */
.page-about .about-daily {
  display: grid;
  gap: var(--s3);
}

.page-about .about-daily__item {
  border-left: 3px solid var(--moss);
  padding-left: var(--s3);
}

.page-about .about-daily__item p {
  margin: 0;
  font-size: 16px;
}

/* ---------- A-02 ---------- */
.page-about .about-team {
  display: grid;
  gap: var(--s4);
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--rule-dark);
}

.page-about .about-roles {
  list-style: none;
  margin: var(--s2) 0 0;
  padding: 0;
}

.page-about .about-roles__item {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: var(--s3);
  padding: var(--s3) 0;
  border-top: 1px solid var(--rule-dark);
}

.page-about .about-roles__item p {
  margin: 0;
  font-size: 15.5px;
  color: rgba(20, 22, 26, .78);
}

.page-about .about-roles__count {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--green-deep);
}

.page-about .about-roles__count small {
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--rock);
  margin-left: 2px;
}

/* ---------- A-03 时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: var(--s4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--s3);
}

.page-about .about-tl__node {
  position: relative;
  background: var(--green-deep);
  color: var(--warm);
  padding: calc(var(--s4) + 4px) var(--s3) var(--s3);
}

.page-about .about-tl__node::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--s3);
  width: 14px;
  height: 14px;
  background: var(--lime);
  transform: translateY(-50%);
}

.page-about .about-tl__node:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 2px;
}

.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--lime);
  margin-bottom: var(--s2);
}

.page-about .about-tl__head {
  font-size: 17px;
  font-weight: 600;
  color: var(--warm);
  margin: 0 0 var(--s1);
}

.page-about .about-tl__text {
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(246, 242, 231, .78);
  margin: 0;
}

.page-about .about-tl__more {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--lime);
  margin: var(--s2) 0 0;
  padding-top: var(--s2);
  border-top: 1px dashed rgba(200, 255, 61, .35);
}

/* ---------- A-04 栏目清单 ---------- */
.page-about .about-cols {
  list-style: none;
  margin: var(--s4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--s2);
}

.page-about .about-cols__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  grid-template-areas:
    "num name freq"
    ". desc desc";
  align-items: baseline;
  gap: 6px var(--s2);
  padding: var(--s3);
  background: var(--sand);
  border: 1px solid var(--rule-dark);
  color: var(--ink);
  text-decoration: none;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-cols__link:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 2px;
}

.page-about .about-cols__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--moss);
}

.page-about .about-cols__name {
  grid-area: name;
  font-size: 17px;
  font-weight: 600;
}

.page-about .about-cols__freq {
  grid-area: freq;
  font-size: 11.5px;
  letter-spacing: .08em;
  white-space: nowrap;
  color: var(--moss);
  border: 1px solid rgba(78, 122, 85, .5);
  padding: 2px 6px;
}

.page-about .about-cols__desc {
  grid-area: desc;
  font-size: 14.5px;
  line-height: 1.65;
  color: rgba(20, 22, 26, .7);
}

.page-about .about-cols__link:hover,
.page-about .about-cols__link:focus-visible {
  background: var(--green-deep);
  border-color: var(--green-deep);
  color: var(--warm);
}

.page-about .about-cols__link:hover .about-cols__num,
.page-about .about-cols__link:focus-visible .about-cols__num,
.page-about .about-cols__link:hover .about-cols__freq,
.page-about .about-cols__link:focus-visible .about-cols__freq {
  color: var(--lime);
  border-color: rgba(200, 255, 61, .5);
}

.page-about .about-cols__link:hover .about-cols__desc,
.page-about .about-cols__link:focus-visible .about-cols__desc {
  color: rgba(246, 242, 231, .78);
}

/* ---------- A-05 合作生态 ---------- */
.page-about .about-partners__figure {
  margin: 0 0 var(--s4);
}

.page-about .about-partners__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--rule-dark);
}

.page-about .about-partners__list {
  list-style: none;
  margin: var(--s4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--s2);
}

.page-about .about-partners__item {
  background: var(--green-mid);
  color: var(--warm);
  padding: var(--s3);
}

.page-about .about-partners__item h3 {
  color: var(--warm);
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(246, 242, 231, .78);
}

/* ---------- A-06 准则 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: var(--s4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--s3);
}

.page-about .about-rules__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--s3);
  border-top: 2px solid var(--green-deep);
  padding-top: var(--s3);
}

.page-about .about-rules__idx {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--moss);
  padding-top: 3px;
}

.page-about .about-rules__item p {
  margin: 0;
  font-size: 15.5px;
  color: rgba(20, 22, 26, .78);
}

/* ---------- 结语入口 ---------- */
.page-about .about-cta {
  background: var(--green-deep);
  color: var(--warm);
  margin-top: var(--s6);
}

.page-about .about-cta__inner {
  padding-block: var(--s6);
}

.page-about .about-cta__title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 300;
  letter-spacing: -.01em;
  margin: 0 0 var(--s2);
}

.page-about .about-cta__text {
  max-width: 34em;
  font-size: 16.5px;
  line-height: 1.78;
  color: rgba(246, 242, 231, .78);
  margin: 0 0 var(--s5);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-daily {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--s4);
  }

  .page-about .about-daily__item:first-child {
    grid-column: 1 / -1;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    align-items: start;
  }

  .page-about .about-tl {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: var(--s2);
  }

  .page-about .about-tl__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    border-top: 0;
    transition: max-height .28s var(--ease), opacity .22s var(--ease), margin-top .28s var(--ease), padding-top .28s var(--ease);
  }

  .page-about .about-tl__node:hover .about-tl__more,
  .page-about .about-tl__node:focus-within .about-tl__more {
    max-height: 200px;
    opacity: 1;
    margin-top: var(--s2);
    padding-top: var(--s2);
    border-top: 1px dashed rgba(200, 255, 61, .35);
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: var(--s7);
    padding-block: var(--s7);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--topbar-h) + var(--s3));
    align-self: start;
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list li {
    border-top: 1px solid var(--rule-dark);
  }

  .page-about .about-index__list a {
    display: flex;
    white-space: normal;
    width: 100%;
    padding: var(--s3) 0;
    border-bottom: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__more,
  .page-about .about-cols__link,
  .page-about .about-index__list a {
    transition: none;
  }
}