.page-about {
  --about-rail-w: 200px;
  --about-pad: clamp(52px, 8vw, 108px);
  --about-gap: clamp(20px, 4vw, 52px);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fog);
  margin: 0 0 14px;
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.55rem, 4vw, 2.5rem);
  line-height: 1.24;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
}

.page-about h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 2vw, 1.12rem);
  line-height: 1.45;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about p {
  font-size: 1rem;
  line-height: 1.78;
  color: rgba(244, 238, 220, 0.82);
  margin: 0 0 16px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(22px, 4vw, 40px) clamp(48px, 7vw, 86px);
  background:
    radial-gradient(circle at 92% -14%, rgba(182, 255, 59, 0.16), transparent 48%),
    linear-gradient(178deg, var(--ink) 0%, var(--ink-deep) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(22px, 4vw, 40px);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--fog);
}

.page-about .about-hero .breadcrumb a {
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  border-top: 1px solid var(--line);
  color: rgba(244, 238, 220, 0.74);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--lime);
  border-top-color: var(--line-lime);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-about .about-rail__note {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.9;
  letter-spacing: 0.04em;
  color: var(--fog);
  padding-left: 12px;
  border-left: 2px solid var(--moss);
  margin: 0;
}

.page-about .about-hero__body h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 6.4vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(18px, 3vw, 26px);
  color: var(--paper);
  max-width: 18em;
}

.page-about .about-hero__lede {
  font-size: clamp(1.02rem, 2vw, 1.16rem);
  color: rgba(244, 238, 220, 0.92);
  max-width: 44em;
}

.page-about .about-hero__text {
  max-width: 44em;
  color: rgba(168, 181, 172, 0.92);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .about-stat {
  background: rgba(17, 21, 18, 0.72);
  padding: 16px 14px;
  display: grid;
  gap: 6px;
  min-width: 0;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 5vw, 2.1rem);
  font-weight: 600;
  line-height: 1;
  color: var(--lime);
  letter-spacing: 0.02em;
}

.page-about .about-stat__label {
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--fog);
}

/* ---------- 区块骨架 ---------- */
.page-about .about-section {
  padding-block: var(--about-pad);
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--alt {
  background: linear-gradient(180deg, rgba(35, 74, 58, 0.18), rgba(11, 31, 23, 0));
}

.page-about .about-section--paper {
  background: var(--paper);
  color: var(--ink-deep);
}

.page-about .about-section--paper h2,
.page-about .about-section--paper h3 {
  color: var(--ink-deep);
}

.page-about .about-section--paper p,
.page-about .about-section--paper .about-section__lede {
  color: rgba(17, 21, 18, 0.78);
}

.page-about .about-section--paper .eyebrow {
  color: var(--moss);
}

.page-about .about-section__head {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-section__lede {
  font-size: clamp(0.98rem, 1.8vw, 1.08rem);
  color: rgba(244, 238, 220, 0.8);
  max-width: 46em;
  margin-bottom: 0;
}

.page-about .about-section:target h2 {
  color: var(--lime);
}

/* ---------- 看台方法 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-split__rail .eyebrow {
  padding-left: 12px;
  border-left: 2px solid var(--lime);
  color: var(--lime);
}

.page-about .about-split__main p {
  max-width: 46em;
}

.page-about .about-fig {
  margin: clamp(22px, 4vw, 34px) 0 0;
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--ink-deep);
  object-fit: cover;
}

.page-about .about-fig--wide img {
  aspect-ratio: 14 / 9;
}

.page-about .about-fig__cap {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--fog);
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}

/* ---------- 团队构成 ---------- */
.page-about .about-team__head {
  display: grid;
  gap: clamp(22px, 4vw, 36px);
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-team__head .about-fig {
  margin: 0;
}

.page-about .about-team__head .about-fig img {
  aspect-ratio: 11 / 8;
}

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

.page-about .about-role {
  position: relative;
  background: var(--ink);
  padding: clamp(20px, 3vw, 26px) clamp(18px, 3vw, 24px) clamp(24px, 3vw, 28px);
  transition: background 0.25s ease;
}

.page-about .about-role::after {
  content: "";
  position: absolute;
  left: clamp(18px, 3vw, 24px);
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--amber);
  transition: width 0.28s ease;
}

.page-about .about-role:hover::after {
  width: 44px;
}

.page-about .about-role:hover {
  background: rgba(35, 74, 58, 0.24);
}

.page-about .about-role__tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin: 0 0 12px;
}

.page-about .about-role p:last-child {
  margin-bottom: 0;
  font-size: 0.94rem;
}

/* ---------- 历程 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 26px);
}

.page-about .about-timeline__item {
  position: relative;
  padding-top: 18px;
  border-top: 1px solid var(--line-strong);
  min-width: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 38px;
  height: 2px;
  background: var(--lime);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3.4vw, 1.9rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--lime);
  margin-bottom: 10px;
}

.page-about .about-timeline__item p {
  font-size: 0.93rem;
  margin-bottom: 0;
}

/* ---------- 质量流程 ---------- */
.page-about .about-checks {
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 40px);
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(11, 31, 23, 0.14);
  border: 1px solid rgba(11, 31, 23, 0.16);
}

.page-about .about-check {
  background: var(--paper);
  padding: clamp(18px, 3vw, 26px);
}

.page-about .about-check__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.14em;
  color: var(--moss);
  margin-bottom: 10px;
}

.page-about .about-check h3 {
  font-size: clamp(1rem, 2vw, 1.14rem);
}

.page-about .about-check p {
  margin-bottom: 0;
  font-size: 0.93rem;
}

.page-about .about-cadence {
  display: grid;
  gap: 1px;
  background: rgba(11, 31, 23, 0.14);
  border-top: 1px solid rgba(11, 31, 23, 0.2);
}

.page-about .about-cadence__item {
  display: grid;
  gap: 4px;
  padding: 14px 0 14px 12px;
  border-left: 2px solid var(--moss);
  background: var(--paper);
  font-size: 0.92rem;
  color: rgba(17, 21, 18, 0.8);
}

.page-about .about-cadence__item:first-child {
  border-left-color: var(--amber);
}

.page-about .about-cadence__time {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--ink-deep);
  font-weight: 600;
}

/* ---------- 合作生态 ---------- */
.page-about .about-numbers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-number {
  background: rgba(17, 21, 18, 0.78);
  padding: clamp(16px, 3vw, 24px);
  display: grid;
  gap: 8px;
  min-width: 0;
}

.page-about .about-number__val {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4.4vw, 2.2rem);
  font-weight: 600;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-number__label {
  font-size: 0.84rem;
  line-height: 1.55;
  color: var(--fog);
}

.page-about .about-ecosystem__note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 44em;
  padding-left: 14px;
  border-left: 2px solid var(--moss);
  font-size: 0.95rem;
}

/* ---------- 协作入口 ---------- */
.page-about .about-entry__grid {
  display: grid;
  gap: clamp(14px, 2.4vw, 20px);
}

.page-about .about-entry__card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(160deg, rgba(35, 74, 58, 0.3), rgba(11, 31, 23, 0.2));
  min-width: 0;
}

.page-about .about-entry__card p {
  font-size: 0.93rem;
  margin-bottom: 0;
}

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

.page-about .about-entry__actions .btn {
  display: inline-block;
  text-decoration: none;
}

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

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

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

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

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

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

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

@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-offset) + 24px);
  }

  .page-about .about-split {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-split__rail {
    position: sticky;
    top: calc(var(--header-offset) + 24px);
    align-self: start;
  }

  .page-about .about-team__head {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-team__head .about-fig img {
    aspect-ratio: 10 / 7;
  }

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

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

  .page-about .about-timeline__item {
    padding: 18px clamp(14px, 1.6vw, 22px) 0 0;
  }

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

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

  .page-about .about-fig--wide img {
    aspect-ratio: 21 / 9;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .about-role,
  .page-about .about-role::after,
  .page-about .about-rail__list a {
    transition: none !important;
    transform: none !important;
    animation: none !important;
  }
}