.page-about {
  --about-edge: rgba(201, 169, 106, .28);
  --about-shadow: 8px 8px 0 rgba(0, 0, 0, .45);
}

.page-about .crumbs {
  margin: 20px 0 4px;
  font-size: 12px;
  color: var(--mist-dim);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 18px;
  margin-top: 12px;
}

.page-about .about-hero__stage {
  position: relative;
  overflow: hidden;
  padding: 28px 22px 32px;
  border: 1px solid var(--rock);
  border-radius: var(--radius);
  background: linear-gradient(155deg, var(--forest) 0%, var(--ink) 78%);
  box-shadow: var(--about-shadow);
}

.page-about .about-hero__texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .26;
  z-index: 0;
}

.page-about .about-hero__eyebrow,
.page-about .about-hero__title,
.page-about .about-hero__lead {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .about-hero__eyebrow .num {
  color: var(--mint);
  font-size: 14px;
  letter-spacing: .06em;
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-size: clamp(29px, 7.2vw, 60px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--cream);
  font-weight: 800;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__note {
  position: relative;
  z-index: 1;
  margin: 0 0 18px;
  padding-left: 10px;
  border-left: 1px solid var(--about-edge);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--gold);
}

.page-about .about-hero__cards {
  display: grid;
  gap: 12px;
}

.page-about .about-card {
  position: relative;
  padding: 16px 16px 18px;
  border: 1px solid var(--rock);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--rock) 0%, var(--ink-deep) 100%);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, .4);
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-card--lit {
  background: linear-gradient(180deg, var(--moss) 0%, var(--forest) 100%);
  border-color: rgba(57, 245, 181, .35);
}

.page-about .about-card:hover {
  border-color: var(--mint);
  transform: translateY(-2px);
}

.page-about .about-card__num {
  display: block;
  font-size: 34px;
  line-height: 1;
  color: var(--gold);
  font-weight: 700;
}

.page-about .about-card--lit .about-card__num {
  color: var(--mint);
}

.page-about .about-card__unit {
  font-size: 15px;
  margin-left: 2px;
}

.page-about .about-card__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-card__text {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-dim);
}

/* ---------- 数据流 ---------- */
.page-about .about-stream {
  display: grid;
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--rock);
  border-bottom: 1px solid var(--rock);
  background: var(--rock);
}

.page-about .about-stream__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 4px;
  background: var(--ink);
}

.page-about .about-stream__num {
  font-size: 22px;
  color: var(--mint);
  font-weight: 700;
}

.page-about .about-stream__label {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 通用区块头 ---------- */
.page-about .about-section {
  margin-top: 54px;
}

.page-about .about-head {
  margin-bottom: 22px;
  border-bottom: 1px solid var(--rock);
  padding-bottom: 16px;
}

.page-about .about-head__kicker {
  display: inline-block;
  margin-bottom: 10px;
  padding-bottom: 4px;
  border-bottom: 2px solid var(--gold);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--gold);
}

.page-about .about-head__title {
  margin: 0;
  font-size: clamp(21px, 4.6vw, 34px);
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--cream);
  font-weight: 800;
}

.page-about .about-head__sub {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist-dim);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__body p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.95;
  color: var(--mist);
}

.page-about .about-origin__body p:first-child::first-letter {
  float: left;
  margin: 4px 10px 0 0;
  font-size: 46px;
  line-height: .9;
  color: var(--gold);
  font-family: var(--font-mono);
}

.page-about .about-origin__aside {
  margin-top: 20px;
  padding: 18px 18px 16px;
  border-left: 3px solid var(--mint);
  background: linear-gradient(90deg, rgba(31, 74, 59, .55), rgba(15, 42, 35, .12));
}

.page-about .about-origin__quote {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--cream);
}

.page-about .about-origin__byline {
  margin: 10px 0 0;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mist-dim);
}

/* ---------- 阶段时间轴 ---------- */
.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--mint), var(--gold) 52%, var(--rock) 100%);
  opacity: .5;
}

.page-about .tl__item {
  position: relative;
  padding-left: 48px;
  margin-bottom: 12px;
  outline: none;
}

.page-about .tl__marker {
  position: absolute;
  left: 0;
  top: 14px;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 2px solid var(--rock);
  border-radius: var(--radius);
  background: var(--ink-deep);
  color: var(--gold);
  font-size: 13px;
  font-weight: 700;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

.page-about .tl__item:hover .tl__marker,
.page-about .tl__item:focus .tl__marker {
  border-color: var(--mint);
  color: var(--mint);
}

.page-about .tl__card {
  padding: 16px 16px 14px;
  border: 1px solid var(--rock);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(31, 74, 59, .4), rgba(11, 15, 14, .9));
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease), transform .25s var(--ease);
}

.page-about .tl__item:hover .tl__card,
.page-about .tl__item:focus .tl__card,
.page-about .tl__item:focus-within .tl__card {
  border-color: rgba(57, 245, 181, .55);
  box-shadow: var(--about-shadow);
  transform: translateX(3px);
}

.page-about .tl__title {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.5;
  color: var(--cream);
  font-weight: 700;
}

.page-about .tl__sum {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .tl__more {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .3s var(--ease);
}

.page-about .tl__more > div {
  overflow: hidden;
}

.page-about .tl__more p {
  margin: 0;
  padding-top: 0;
  font-size: 13px;
  line-height: 1.85;
  color: var(--mist-dim);
  border-top: 1px solid transparent;
  transition: padding .3s var(--ease), border-color .3s var(--ease);
}

.page-about .tl__item:hover .tl__more,
.page-about .tl__item:focus .tl__more,
.page-about .tl__item:focus-within .tl__more {
  grid-template-rows: 1fr;
}

.page-about .tl__item:hover .tl__more p,
.page-about .tl__item:focus .tl__more p,
.page-about .tl__item:focus-within .tl__more p {
  padding-top: 12px;
  border-top-color: rgba(201, 169, 106, .35);
}

/* ---------- 团队 ---------- */
.page-about .crew {
  display: grid;
  gap: 18px;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--rock);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-deep);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, .4);
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--rock);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--mist-dim);
  background: rgba(43, 47, 46, .45);
}

.page-about .crew__stack {
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .crew__fold {
  border: 1px solid var(--rock);
  border-radius: var(--radius);
  background: var(--ink-deep);
  transition: border-color .25s var(--ease);
}

.page-about .crew__fold[open] {
  border-color: rgba(201, 169, 106, .42);
}

.page-about .crew__fold:hover {
  border-color: rgba(57, 245, 181, .45);
}

.page-about .crew__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--cream);
  font-size: 15px;
  font-weight: 600;
}

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

.page-about .crew__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--mint);
}

.page-about .crew__fold[open] .crew__summary::after {
  content: "−";
  color: var(--gold);
}

.page-about .crew__role {
  flex: 1 1 auto;
}

.page-about .crew__count {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .crew__desc {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 13px;
  line-height: 1.9;
  color: var(--mist-dim);
  border-top: 1px solid rgba(43, 47, 46, .9);
  padding-top: 12px;
}

/* ---------- 覆盖 ---------- */
.page-about .cover-body {
  display: grid;
  gap: 18px;
}

.page-about .cov-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .cov-grid__cell {
  display: grid;
  gap: 2px;
  padding: 10px 10px 12px;
  border: 1px solid var(--rock);
  border-radius: var(--radius);
  background: rgba(15, 42, 35, .42);
  transition: border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .cov-grid__cell:hover,
.page-about .cov-grid__cell:focus-within {
  border-color: var(--mint);
  background: rgba(31, 74, 59, .7);
}

.page-about .cov-grid__idx {
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .cov-grid__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--mist);
  transition: color .25s var(--ease);
}

.page-about .cov-grid__cell:hover .cov-grid__name,
.page-about .cov-grid__cell:focus-within .cov-grid__name {
  color: var(--cream);
}

.page-about .cov-grid__meta {
  font-size: 10px;
  line-height: 1.5;
  color: var(--mist-dim);
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity .25s var(--ease), max-height .25s var(--ease);
}

.page-about .cov-grid__cell:hover .cov-grid__meta,
.page-about .cov-grid__cell:focus-within .cov-grid__meta {
  opacity: 1;
  max-height: 30px;
}

.page-about .cover-side {
  display: grid;
  gap: 12px;
}

.page-about .cover-side__facts {
  padding: 14px 16px;
  border-left: 2px solid var(--gold);
  background: rgba(43, 47, 46, .4);
}

.page-about .cover-side__facts p {
  margin: 0 0 8px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .cover-side__facts strong {
  color: var(--mint);
  font-weight: 700;
}

.page-about .nodes {
  display: grid;
  gap: 1px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  background: var(--rock);
  border: 1px solid var(--rock);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .nodes__item {
  display: grid;
  gap: 3px;
  padding: 12px 14px;
  background: var(--ink);
}

.page-about .nodes__num {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--ember);
}

.page-about .nodes__label {
  font-size: 13px;
  font-weight: 600;
  color: var(--cream);
}

.page-about .nodes__desc {
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist-dim);
}

/* ---------- 合作 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 12px;
}

.page-about .partner-card {
  padding: 18px 16px 20px;
  border: 1px solid var(--rock);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(31, 74, 59, .5), rgba(7, 11, 10, .9));
  box-shadow: 5px 5px 0 rgba(0, 0, 0, .38);
}

.page-about .partner-card--gold {
  border-color: rgba(201, 169, 106, .5);
}

.page-about .partner-card__num {
  display: block;
  font-size: 30px;
  line-height: 1;
  font-weight: 700;
  color: var(--gold);
}

.page-about .partner-card__title {
  margin: 8px 0 10px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--cream);
  font-weight: 700;
}

.page-about .partner-card__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.9;
  color: var(--mist-dim);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  margin: 54px 0 8px;
}

.page-about .about-close__panel {
  padding: 24px 20px 26px;
  border: 1px solid var(--rock);
  border-top: 3px solid var(--mint);
  border-radius: var(--radius);
  background: linear-gradient(140deg, var(--moss) 0%, var(--forest) 55%, var(--ink) 100%);
  box-shadow: var(--about-shadow);
}

.page-about .about-close__title {
  margin: 0 0 12px;
  font-size: clamp(19px, 4.4vw, 26px);
  line-height: 1.4;
  color: var(--cream);
  font-weight: 800;
}

.page-about .about-close__text {
  margin: 0 0 20px;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-close__aside {
  margin: 18px 0 0;
  font-size: 12px;
  line-height: 1.85;
  color: var(--mist-dim);
}

.page-about .about-close__aside a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 169, 106, .5);
}

.page-about .about-close__aside a:hover,
.page-about .about-close__aside a:focus-visible {
  color: var(--mint);
  border-bottom-color: var(--mint);
}

.page-about a:focus-visible,
.page-about .tl__item:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-stream {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stream__item {
    flex-direction: column;
    gap: 4px;
    padding: 14px 12px;
  }

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

  .page-about .nodes {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 22px;
    align-items: start;
  }

  .page-about .about-hero__stage {
    padding: 52px 44px 56px;
    min-height: 480px;
  }

  .page-about .about-hero__title {
    max-width: 82%;
  }

  .page-about .about-hero__note {
    position: absolute;
    top: 44px;
    right: 28px;
    margin: 0;
    padding: 0 12px 0 0;
    border-left: 0;
    border-right: 1px solid var(--about-edge);
    writing-mode: vertical-rl;
    letter-spacing: .34em;
  }

  .page-about .about-hero__cards {
    gap: 14px;
  }

  .page-about .about-card:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-card:nth-child(4) {
    margin-top: -26px;
  }

  .page-about .about-origin {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-origin .about-head {
    grid-column: 1 / -1;
  }

  .page-about .about-origin__aside {
    margin-top: 6px;
  }

  .page-about .tl__item {
    padding-left: 62px;
    margin-bottom: 14px;
  }

  .page-about .tl::before {
    left: 19px;
  }

  .page-about .tl__marker {
    width: 40px;
    height: 40px;
  }

  .page-about .tl__card {
    padding: 20px 22px 18px;
  }

  .page-about .crew {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .cover-body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .about-close__panel {
    padding: 40px 44px 38px;
  }
}

@media (hover: none) {
  .page-about .tl__more {
    grid-template-rows: 1fr;
  }

  .page-about .tl__more p {
    padding-top: 12px;
    border-top-color: rgba(201, 169, 106, .3);
  }

  .page-about .cov-grid__meta {
    opacity: 1;
    max-height: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .tl__card,
  .page-about .tl__marker,
  .page-about .tl__more,
  .page-about .tl__more p,
  .page-about .cov-grid__cell,
  .page-about .cov-grid__meta {
    transition: none;
  }

  .page-about .about-card:hover {
    transform: none;
  }

  .page-about .tl__item:hover .tl__card {
    transform: none;
  }
}