.page-about {
  --about-line: rgba(244, 241, 232, .14);
  --about-soft: rgba(244, 241, 232, .78);
  --about-dim: rgba(244, 241, 232, .55);
  padding-bottom: clamp(48px, 8vw, 104px);
  background: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(104px, 16vw, 176px) 0 clamp(32px, 5vw, 58px);
  background:
    radial-gradient(120% 100% at 84% 0%, rgba(198, 255, 61, .16) 0%, transparent 56%),
    radial-gradient(96% 84% at 2% 100%, rgba(255, 77, 46, .13) 0%, transparent 58%),
    var(--ink);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(244, 241, 232, .035) 1px, transparent 1px);
  background-size: 100% 46px;
}

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

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 7.6vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 17ch;
}

.page-about .about-hero .lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 58ch;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  list-style: none;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: clamp(16px, 2.4vw, 24px) 0 0;
  border-top: 1px solid var(--about-line);
}

.page-about .hero-meta li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .hm-k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--steel);
}

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

/* ---------- 章节布局 ---------- */
.page-about .about-layout {
  display: block;
  padding-top: clamp(32px, 5vw, 64px);
}

.page-about .about-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin: 0 0 clamp(26px, 4vw, 44px);
  padding: 0 0 14px;
  border-bottom: 1px solid var(--about-line);
  scrollbar-width: none;
}

.page-about .about-index::-webkit-scrollbar {
  display: none;
}

.page-about .about-index .chapter-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--fence);
  border-radius: 2px;
  background: rgba(11, 14, 13, .6);
  color: var(--steel);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .about-index .chapter-link .idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--flare);
}

.page-about .about-index .chapter-link:hover,
.page-about .about-index .chapter-link:focus-visible,
.page-about .about-index .chapter-link[data-active] {
  color: var(--lime);
  border-color: var(--lime);
  background: rgba(198, 255, 61, .08);
}

.page-about .about-index .chapter-link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

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

@media (min-width: 1024px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 212px minmax(0, 1fr);
    gap: clamp(30px, 4vw, 68px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    overflow: visible;
    margin: 0;
    padding: 0;
    border-bottom: 0;
    border-left: 1px solid var(--about-line);
  }

  .page-about .about-index .chapter-link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    margin-left: -1px;
    padding: 12px 10px 12px 15px;
    white-space: normal;
    font-size: 14px;
  }

  .page-about .about-index .chapter-link:hover,
  .page-about .about-index .chapter-link:focus-visible,
  .page-about .about-index .chapter-link[data-active] {
    background: linear-gradient(90deg, rgba(198, 255, 61, .12), transparent 88%);
    border-left-color: var(--lime);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  position: relative;
  margin-top: clamp(38px, 6vw, 78px);
  padding-top: clamp(30px, 5vw, 54px);
  border-top: 1px solid var(--about-line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-chapter:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 64px;
  height: 2px;
  background: var(--lime);
}

.page-about .about-chapter:first-child::before {
  display: none;
}

.page-about .chapter-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--flare);
}

.page-about .about-chapter h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.3;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-chapter p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-soft);
}

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

.page-about .sub-head {
  margin: clamp(26px, 4vw, 40px) 0 10px;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 600;
  color: var(--paper);
}

/* ---------- 图文分栏 ---------- */
.page-about .split {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
  min-width: 0;
}

.page-about .split-main {
  min-width: 0;
}

@media (min-width: 900px) {
  .page-about .split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

.page-about .about-figure {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--fence);
  border-radius: 2px;
  background: var(--turf);
  box-shadow: 6px 6px 0 rgba(42, 58, 53, .55), 12px 12px 0 rgba(42, 58, 53, .22);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(.9) contrast(1.08);
}

.page-about .about-figure--wide {
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-about .about-figure--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--steel);
}

/* ---------- 数据标注块 ---------- */
.page-about .metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--fence);
  border: 1px solid var(--fence);
  border-radius: 2px;
}

.page-about .metric {
  background: var(--coal);
  padding: 16px 14px 14px;
}

.page-about .metric-value {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
}

.page-about .metric-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--steel);
}

@media (min-width: 760px) {
  .page-about .metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 岗位卡片 ---------- */
.page-about .crew-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 34px);
}

@media (min-width: 620px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .crew-card {
  padding: 16px 18px 14px;
  border: 1px solid var(--fence);
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(20, 48, 42, .92), rgba(11, 14, 13, .94));
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-about .crew-card:hover,
.page-about .crew-card:focus,
.page-about .crew-card:focus-within {
  border-color: var(--lime);
  transform: translateY(-3px);
  box-shadow: 0 12px 26px rgba(0, 0, 0, .45);
}

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

.page-about .crew-role {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .crew-role .dot {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--flare);
}

.page-about .crew-sum {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .crew-duties {
  list-style: none;
  max-height: 0;
  margin: 0;
  padding: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height .34s var(--ease), opacity .22s var(--ease), margin-top .34s var(--ease);
}

.page-about .crew-card:hover .crew-duties,
.page-about .crew-card:focus .crew-duties,
.page-about .crew-card:focus-within .crew-duties {
  max-height: 280px;
  margin-top: 12px;
  opacity: 1;
}

.page-about .crew-duties li {
  position: relative;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--about-soft);
}

.page-about .crew-duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 6px;
  height: 1px;
  background: var(--lime);
}

@media (hover: none) {
  .page-about .crew-duties {
    max-height: none;
    margin-top: 12px;
    opacity: 1;
  }
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-scale {
  display: block;
  width: 100%;
  height: 16px;
  margin: clamp(18px, 2.6vw, 26px) 0 clamp(20px, 3vw, 30px);
  color: var(--fence);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .timeline li {
  position: relative;
  padding: 0 0 24px 26px;
  border-left: 1px solid var(--about-line);
}

.page-about .timeline li:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .timeline li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--lime);
}

.page-about .timeline .t-time {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--flare);
}

.page-about .timeline h3 {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .timeline p {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--steel);
}

/* ---------- 本地与社群 ---------- */
.page-about .city-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
}

.page-about .city-list li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border: 1px solid var(--fence);
  border-radius: 999px;
  background: rgba(11, 14, 13, .6);
  font-size: 13px;
  color: var(--about-soft);
}

.page-about .city-list li span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--lime);
}

.page-about .about-banner {
  position: relative;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  border: 1px solid var(--fence);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06);
}

.page-about .about-banner figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px 12px;
  background: linear-gradient(0deg, rgba(7, 19, 15, .94), rgba(7, 19, 15, 0));
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--paper);
}

.page-about .coop-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  list-style: none;
  margin: clamp(14px, 2vw, 20px) 0 0;
  padding: 0;
}

@media (min-width: 780px) {
  .page-about .coop-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .coop-item {
  padding: 16px 16px 14px;
  border: 1px solid var(--fence);
  border-left: 3px solid var(--flare);
  border-radius: 2px;
  background: rgba(20, 48, 42, .55);
}

.page-about .coop-name {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: .04em;
  color: var(--lime);
}

.page-about .coop-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-soft);
}

/* ---------- 赛季阶段 ---------- */
.page-about .phase-track {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  list-style: none;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 1px;
  background: var(--fence);
  border-radius: 2px;
}

@media (min-width: 820px) {
  .page-about .phase-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .phase-track li {
  background: var(--coal);
  padding: 18px 18px 20px;
}

.page-about .phase-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--flare);
}

.page-about .phase-track h3 {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .phase-track p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 三条坚持 ---------- */
.page-about .creed-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  list-style: none;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
  background: var(--fence);
  border-top: 1px solid var(--fence);
  border-bottom: 1px solid var(--fence);
}

.page-about .creed-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 0 16px;
  background: var(--ink);
  padding: 20px 18px;
}

.page-about .creed-index {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
}

.page-about .creed-title {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.4vw, 21px);
  font-weight: 600;
  color: var(--paper);
}

.page-about .creed-text {
  grid-column: 2;
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--about-soft);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 58px);
  padding: clamp(22px, 3.6vw, 38px);
  border: 1px solid var(--fence);
  border-left: 3px solid var(--lime);
  border-radius: 2px;
  background: linear-gradient(135deg, rgba(20, 48, 42, .92), rgba(11, 14, 13, .94));
}

.page-about .about-cta h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(20px, 2.8vw, 26px);
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

@media (max-width: 480px) {
  .page-about .cta-links .btn {
    width: 100%;
    text-align: center;
  }

  .page-about .creed-item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 0 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew-card,
  .page-about .crew-duties,
  .page-about .about-index .chapter-link {
    transition: none;
  }

  .page-about .crew-card:hover,
  .page-about .crew-card:focus,
  .page-about .crew-card:focus-within {
    transform: none;
  }
}