.page-about .about-crumb {
  margin-bottom: clamp(20px, 3vw, 36px);
}

/* ---------- hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 56px) 0 clamp(36px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 8% -10%, rgba(62, 92, 75, 0.62), transparent 62%),
    radial-gradient(90% 70% at 96% 6%, rgba(255, 122, 61, 0.16), transparent 64%),
    var(--ink);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(to right, rgba(199, 205, 209, 0.07) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(to bottom, rgba(199, 205, 209, 0.07) 0 1px, transparent 1px 96px);
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-hero__lead {
  --vf-len: 22px;
  --vf-c: var(--lime);
  padding: clamp(16px, 3vw, 30px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--narrow);
  font-size: clamp(34px, 7vw, 62px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
  color: rgba(242, 239, 230, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  align-content: start;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(14, 32, 51, 0.62);
}

.page-about .about-stat--wide {
  grid-column: 1 / -1;
  border-color: rgba(200, 247, 81, 0.34);
  background: linear-gradient(140deg, rgba(62, 92, 75, 0.62), rgba(14, 32, 51, 0.62));
}

.page-about .about-stat__num {
  font-family: var(--narrow);
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--lime);
}

.page-about .about-stat__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(242, 239, 230, 0.7);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-stream {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about .about-index {
  align-self: start;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(14, 32, 51, 0.5);
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--silver);
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  font-size: 13px;
  color: rgba(242, 239, 230, 0.86);
  text-decoration: none;
  transition: border-color 180ms var(--ease), color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-index__list a .mono {
  font-size: 11px;
  color: var(--lime);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  border-color: var(--lime);
  background: rgba(200, 247, 81, 0.1);
  color: var(--paper);
}

.page-about .about-index__years {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-index__sub {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--clay);
}

.page-about .about-index__yearlist {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-index__yearlist a {
  padding: 4px 10px;
  border-radius: var(--pill);
  border: 1px solid rgba(199, 205, 209, 0.24);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--silver);
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-index__yearlist a:hover,
.page-about .about-index__yearlist a:focus-visible {
  color: var(--signal);
  border-color: var(--signal);
}

.page-about .about-columns {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  min-width: 0;
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: clamp(22px, 4vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-block--night {
  background:
    radial-gradient(120% 80% at 100% 0%, rgba(62, 92, 75, 0.45), transparent 60%),
    var(--night);
}

.page-about .about-block--moss {
  background: linear-gradient(155deg, var(--moss), #2c4638 88%);
}

.page-about .about-block--paper {
  background: var(--paper);
  color: var(--char);
  border-color: rgba(16, 20, 19, 0.12);
}

.page-about .about-block__head {
  position: relative;
  padding-left: 16px;
  border-left: 2px solid var(--lime);
}

.page-about .about-block--paper .about-block__head {
  border-left-color: var(--clay);
}

.page-about .about-block__index {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--lime);
}

.page-about .about-block--paper .about-block__index {
  color: var(--clay);
}

.page-about .about-block__title {
  margin: 0;
  font-family: var(--narrow);
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-block--paper .about-block__title {
  color: var(--char);
}

.page-about .about-block__intro {
  margin: 12px 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(242, 239, 230, 0.78);
}

.page-about .about-block--paper .about-block__intro {
  color: rgba(16, 20, 19, 0.72);
}

.page-about .about-figure {
  margin: clamp(22px, 4vw, 32px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--r-md);
  object-fit: cover;
}

.page-about .about-figure--paper img {
  border: 1px solid rgba(16, 20, 19, 0.1);
}

.page-about .about-figure .media__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--rock);
}

.page-about .about-block--paper .media__caption {
  color: rgba(16, 20, 19, 0.55);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  position: relative;
  margin: clamp(22px, 4vw, 36px) 0 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--lime), rgba(199, 205, 209, 0.28) 40%, rgba(199, 205, 209, 0.12));
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 28px);
}

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

.page-about .tl__dot {
  position: absolute;
  left: -30px;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--silver);
  background: var(--night);
  transition: background 180ms var(--ease), border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .tl__item:hover .tl__dot,
.page-about .tl__item:focus-within .tl__dot {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 247, 81, 0.18);
}

.page-about .tl__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .tl__year {
  font-family: var(--narrow);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .tl__title {
  margin: 10px 0 0;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .tl__text {
  margin: 8px 0 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(242, 239, 230, 0.76);
}

.page-about .tl__more {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(200, 247, 81, 0.82);
  border-left: 2px solid var(--clay);
  padding-left: 0;
  transition: max-height 220ms var(--ease), opacity 220ms var(--ease), padding-left 220ms var(--ease), margin 220ms var(--ease);
}

.page-about .tl__item:hover .tl__more,
.page-about .tl__item:focus-within .tl__more {
  max-height: 8em;
  opacity: 1;
  margin-top: 8px;
  padding-left: 12px;
}

/* ---------- 流程 ---------- */
.page-about .flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: clamp(22px, 4vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: flowstep;
}

.page-about .flow__step {
  position: relative;
  padding: 16px 16px 18px;
  border-radius: var(--r-md);
  border: 1px solid rgba(16, 20, 19, 0.12);
  background: rgba(255, 255, 255, 0.55);
}

.page-about .flow__num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--clay);
}

.page-about .flow__title {
  margin: 8px 0 0;
  font-family: var(--narrow);
  font-size: 19px;
  line-height: 1.2;
  color: var(--char);
}

.page-about .flow__text {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(16, 20, 19, 0.72);
}

.page-about .note {
  margin: clamp(16px, 3vw, 22px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--clay);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(16, 20, 19, 0.68);
}

/* ---------- 团队 ---------- */
.page-about .team-bars {
  display: grid;
  gap: 12px;
  margin: clamp(22px, 4vw, 30px) 0 0;
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 6.5em 1fr auto;
  align-items: center;
  gap: 12px;
}

.page-about .team-row__name {
  font-size: 13px;
  color: rgba(242, 239, 230, 0.82);
}

.page-about .team-row__track {
  display: block;
  height: 8px;
  border-radius: var(--pill);
  background: rgba(11, 43, 36, 0.55);
  overflow: hidden;
}

.page-about .team-row__bar {
  display: block;
  height: 100%;
  border-radius: var(--pill);
}

.page-about .team-row__bar--a {
  width: 42%;
  background: var(--lime);
}

.page-about .team-row__bar--b {
  width: 35%;
  background: var(--signal);
}

.page-about .team-row__bar--c {
  width: 23%;
  background: var(--silver);
}

.page-about .team-row__num {
  font-size: 15px;
  color: var(--paper);
}

.page-about .about-team__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-team__main {
  min-width: 0;
}

.page-about .about-team__main .filter-bar {
  margin-bottom: 16px;
}

.page-about .team-items {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-items li {
  padding: 13px 15px;
  border-radius: var(--r-sm);
  border: 1px solid rgba(199, 205, 209, 0.22);
  background: rgba(11, 43, 36, 0.32);
}

.page-about .team-items li > p {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(242, 239, 230, 0.82);
}

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

.page-about .about-figure--side img {
  border: 1px solid rgba(199, 205, 209, 0.22);
}

/* ---------- 合作 ---------- */
.page-about .coop-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(22px, 4vw, 32px);
}

.page-about .coop-card {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(11, 43, 36, 0.42);
  padding: 16px;
  transition: border-color 180ms var(--ease);
}

.page-about .coop-card[open] {
  border-color: rgba(200, 247, 81, 0.42);
  background: rgba(11, 43, 36, 0.66);
}

.page-about .coop-card summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}

.page-about .coop-card summary::-webkit-details-marker {
  display: none;
}

.page-about .coop-card__count {
  font-family: var(--narrow);
  font-size: 22px;
  line-height: 1;
  color: var(--lime);
}

.page-about .coop-card__name {
  font-size: 14.5px;
  color: var(--paper);
}

.page-about .coop-card__hint {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .coop-card[open] .coop-card__hint {
  color: var(--rock);
}

.page-about .coop-card p {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(242, 239, 230, 0.76);
}

/* ---------- 覆盖 ---------- */
.page-about .reach-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(22px, 4vw, 32px);
}

.page-about .reach-cell {
  padding: 16px;
  border-radius: var(--r-md);
  border: 1px solid rgba(16, 20, 19, 0.12);
  background: rgba(255, 255, 255, 0.6);
}

.page-about .reach-cell--wide {
  border-color: rgba(180, 103, 74, 0.4);
  background: linear-gradient(150deg, rgba(180, 103, 74, 0.12), rgba(255, 255, 255, 0.72));
}

.page-about .reach-cell__num {
  display: block;
  font-family: var(--narrow);
  font-size: clamp(26px, 4vw, 34px);
  line-height: 1;
  color: var(--char);
}

.page-about .reach-cell__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--clay);
}

.page-about .reach-cell p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(16, 20, 19, 0.7);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-cta {
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid rgba(200, 247, 81, 0.32);
  border-radius: var(--r-lg);
  background:
    radial-gradient(110% 90% at 90% 0%, rgba(255, 122, 61, 0.18), transparent 60%),
    var(--night);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--narrow);
  font-size: clamp(22px, 3.2vw, 30px);
  line-height: 1.1;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 32em;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(242, 239, 230, 0.76);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .reach-cell--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

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

  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-team__body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.62fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-stream {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: clamp(28px, 3.4vw, 52px);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 20px);
    padding: 18px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 4px;
  }

  .page-about .about-index__list a {
    width: 100%;
    border-color: transparent;
    border-radius: var(--r-sm);
    padding: 9px 10px;
  }
}

@media (hover: none) {
  .page-about .tl__more {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
    padding-left: 12px;
  }
}

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

  .page-about .tl__more {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
    padding-left: 12px;
  }
}