.page-about {
  --ab-body: rgba(242, 239, 228, 0.72);
  --ab-body-strong: rgba(242, 239, 228, 0.9);
  --ab-surface: #14181A;
}

.page-about .crumbs {
  padding-top: clamp(14px, 2.5vw, 26px);
  font-size: 13px;
  color: rgba(242, 239, 228, 0.55);
}

.page-about .crumbs a {
  color: rgba(242, 239, 228, 0.55);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-about .crumbs span[aria-hidden="true"] {
  padding: 0 8px;
  color: var(--stone);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: end;
  padding-block: clamp(26px, 4.5vw, 52px) clamp(46px, 7vw, 86px);
}

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

.page-about .about-hero .eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
  text-transform: none;
  margin: 0 0 16px;
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(36px, 8.6vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--linen);
  max-width: 18ch;
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ab-body);
  max-width: 46ch;
}

.page-about .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 30px;
  margin: 26px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .hero-fact {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .hero-fact__num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .hero-fact__label {
  font-size: 13px;
  color: var(--stone);
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--moss);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 36px 20px 16px;
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(242, 239, 228, 0.82);
  background: linear-gradient(to top, rgba(11, 20, 16, 0.92), rgba(11, 20, 16, 0));
}

/* ---------- 章节骨架 ---------- */

.page-about .ab-sec {
  margin-top: clamp(54px, 8vw, 96px);
  min-width: 0;
}

.page-about .ab-sec__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-sec__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--stone);
}

.page-about .ab-sec h2 {
  margin: 0;
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--linen);
  padding-left: 14px;
  border-left: 4px solid var(--lime);
}

.page-about .ab-sec__note {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--stone);
  padding-left: 18px;
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  position: relative;
  margin: 30px 0 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--moss), var(--teal) 55%, var(--stone));
  opacity: 0.8;
}

.page-about .tl-item {
  position: relative;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .tl-item:last-child {
  border-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 17px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid var(--moss);
  background: var(--ink);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .tl-item summary {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) 20px;
  align-items: baseline;
  gap: 12px;
  padding: 14px 0 14px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-item summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--stone);
  transition: color var(--dur) var(--ease);
}

.page-about .tl-item:hover .tl-year {
  color: var(--lime);
}

.page-about .tl-title {
  font-size: clamp(16px, 2.4vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--linen);
}

.page-about .tl-mark {
  position: relative;
  width: 14px;
  height: 14px;
  align-self: center;
  justify-self: end;
}

.page-about .tl-mark::before,
.page-about .tl-mark::after {
  content: "";
  position: absolute;
  background: var(--stone);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl-mark::before {
  left: 0;
  right: 0;
  top: 6px;
  height: 2px;
}

.page-about .tl-mark::after {
  top: 0;
  bottom: 0;
  left: 6px;
  width: 2px;
}

.page-about .tl-item details[open] .tl-mark::after {
  transform: scaleY(0);
}

.page-about .tl-item details[open] .tl-mark::before {
  background: var(--lime);
}

.page-about .tl-body {
  padding: 0 0 20px;
}

.page-about .tl-body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ab-body);
  max-width: 54ch;
}

/* ---------- 成型流程 ---------- */

.page-about .pull-quote {
  margin: 30px 0 0;
  font-size: clamp(22px, 4.6vw, 34px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--linen);
  max-width: 22ch;
}

.page-about .pull-quote::before {
  content: "";
  display: block;
  width: 46px;
  height: 3px;
  margin-bottom: 18px;
  background: var(--amber);
  border-radius: 2px;
}

.page-about .flow-figure {
  margin: 28px 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .flow-figure figcaption {
  padding: 12px 16px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
  background: var(--panel);
  border-top: 1px solid var(--line-soft);
}

.page-about .steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .step {
  position: relative;
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ab-surface);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease),
    opacity var(--dur) var(--ease);
}

.page-about .step::before {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  top: 0;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--moss);
  transition: background var(--dur) var(--ease);
}

.page-about .step__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--stone);
  margin-bottom: 12px;
  transition: color var(--dur) var(--ease);
}

.page-about .step__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--linen);
}

.page-about .step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ab-body);
}

/* ---------- 团队 ---------- */

.page-about .team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.page-about .team-card {
  padding: 24px 22px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ab-surface);
  transition: border-color var(--dur) var(--ease);
}

.page-about .team-card--lead {
  background: var(--moss);
  border-color: transparent;
}

.page-about .team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 60px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--lime);
  margin-bottom: 14px;
}

.page-about .team-card:nth-child(2) .team-card__num {
  color: var(--amber);
  font-size: clamp(30px, 5.4vw, 44px);
}

.page-about .team-card:nth-child(3) .team-card__num {
  color: var(--teal);
  font-size: clamp(30px, 5.4vw, 44px);
}

.page-about .team-card__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--linen);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--ab-body);
}

.page-about .team-card:hover {
  border-color: var(--lime);
}

.page-about .team-card--lead:hover {
  border-color: var(--lime);
}

/* ---------- 收录范围 ---------- */

.page-about .scope {
  margin-top: 26px;
  border-top: 1px solid var(--line-soft);
}

.page-about .scope__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .scope__range {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--lime);
  grid-column: 1;
}

.page-about .scope__desc {
  grid-column: 1 / -1;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ab-body);
}

.page-about .scope__dot {
  grid-column: 2;
  grid-row: 1;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  justify-self: end;
}

.page-about .scope__dot--early {
  background: transparent;
  border: 1px solid var(--stone);
}

.page-about .scope__dot--mid {
  background: var(--teal);
  opacity: 0.7;
}

.page-about .scope__dot--full {
  background: var(--teal);
}

.page-about .scope-foot {
  margin: 22px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .inline-link {
  color: var(--linen);
  text-decoration: none;
  border-bottom: 1px solid var(--lime);
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--lime);
}

/* ---------- 合作 ---------- */

.page-about .coop {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 26px;
  align-items: start;
}

.page-about .coop__lead {
  margin: 0 0 16px;
  font-size: clamp(17px, 2.6vw, 20px);
  line-height: 1.6;
  font-weight: 700;
  color: var(--linen);
}

.page-about .coop__body p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ab-body);
}

.page-about .coop__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .coop__list li {
  position: relative;
  padding: 12px 0 12px 20px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ab-body);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .coop__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--teal);
}

.page-about .coop__figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .coop__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 3;
  object-fit: cover;
}

.page-about .coop__figure figcaption {
  padding: 12px 16px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
  background: var(--panel);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 更新节奏 ---------- */

.page-about .cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .cadence-card {
  padding: 22px 20px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--ab-surface);
}

.page-about .cadence-card--alt {
  background: var(--moss);
  border-color: transparent;
}

.page-about .cadence-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 7vw, 52px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--lime);
  margin-bottom: 12px;
}

.page-about .cadence-card--alt .cadence-card__num {
  color: var(--amber);
}

.page-about .cadence-card__title {
  margin: 0 0 10px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--linen);
}

.page-about .cadence-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--ab-body);
}

.page-about .cadence-note {
  margin-top: 22px;
  padding: 20px 20px 22px;
  border-left: 3px solid var(--clay);
  background: rgba(196, 100, 63, 0.08);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.page-about .cadence-note h3 {
  margin: 0 0 8px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--linen);
}

.page-about .cadence-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--ab-body);
}

/* ---------- 结尾入口 ---------- */

.page-about .ab-sec--next {
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 26px;
}

.page-about .next-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ab-surface);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--lime);
  background: var(--moss);
}

.page-about .next-card__kicker {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

.page-about .next-card__title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--linen);
}

.page-about .next-card__desc {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ab-body);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .scope__row {
    grid-template-columns: 200px minmax(0, 1fr) auto;
    gap: 22px;
    align-items: center;
  }

  .page-about .scope__range {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .scope__desc {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .scope__dot {
    grid-column: 3;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
  }

  .page-about .about-hero__figure {
    align-self: end;
  }

  .page-about .ab-sec__head {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
    column-gap: 20px;
  }

  .page-about .ab-sec__idx {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .ab-sec h2 {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .ab-sec__note {
    grid-column: 2;
    grid-row: 2;
  }

  .page-about .steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
    align-items: start;
  }

  .page-about .step:nth-child(3) {
    transform: translateY(-20px);
  }

  .page-about .steps:hover .step {
    opacity: 0.5;
  }

  .page-about .steps:hover .step:hover {
    opacity: 1;
    border-color: var(--lime);
    background: var(--moss);
  }

  .page-about .step:hover::before {
    background: var(--lime);
  }

  .page-about .step:hover .step__no {
    color: var(--lime);
  }

  .page-about .team {
    grid-template-columns: 1.45fr 1fr 1fr;
    gap: 16px;
  }

  .page-about .coop {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 34px;
    align-items: center;
  }

  .page-about .cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .pull-quote {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    max-width: 26ch;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero h1 {
    max-width: 15ch;
  }

  .page-about .timeline {
    padding-left: 42px;
  }

  .page-about .tl-item::before {
    left: -42px;
  }

  .page-about .tl-body p {
    font-size: 16px;
  }

  .page-about .flow-figure {
    margin-top: 32px;
  }
}