.page-about {
  background: var(--pitch);
  color: var(--bone);
}

.page-about .breadcrumb {
  margin-bottom: 28px;
}

.page-about .breadcrumb-link {
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(48px, 8vw, 92px);
  background:
    radial-gradient(120% 92% at 86% -6%, rgba(198, 242, 74, 0.12), transparent 58%),
    linear-gradient(180deg, var(--pitch) 0%, #091D14 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 5vw, 48px);
}

.page-about .about-h1 {
  margin: 16px 0 0;
  font-size: clamp(32px, 7.4vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  font-weight: 900;
  color: var(--chalk);
}

.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.78;
  color: var(--bone);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 32px 0 0;
  padding: 0;
}

.page-about .about-facts > div {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-facts > div:first-child {
  border-top-color: var(--lime);
}

.page-about .about-facts dt {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--stone);
  line-height: 1.5;
}

.page-about .about-facts dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 26px);
  line-height: 1;
  color: var(--chalk);
}

.page-about .about-hero-figure {
  margin: 0;
  position: relative;
  background: var(--midnight);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.9);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(52px, 8.5vw, 100px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: clamp(56px, 20vw, 240px);
  height: 3px;
  background: linear-gradient(90deg, var(--lime), rgba(198, 242, 74, 0));
}

.page-about .about-section--panel {
  background: linear-gradient(180deg, var(--turf) 0%, #0E2A20 100%);
}

.page-about .about-section--deep {
  background:
    linear-gradient(150deg, var(--midnight) 0%, #0C251B 58%, var(--turf) 100%);
}

.page-about .about-section--closing {
  background: linear-gradient(180deg, var(--turf) 0%, var(--moss) 180%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 4vw, 40px);
}

.page-about .about-rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--lime);
  letter-spacing: 0;
}

.page-about .rail-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--moss), rgba(30, 92, 67, 0));
}

.page-about .rail-label {
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--clay);
}

.page-about .eyebrow {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

.page-about .about-h2 {
  margin: 12px 0 0;
  font-size: clamp(23px, 4.2vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--chalk);
}

.page-about .about-sub {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--bone);
}

/* ---------- 时间线 ---------- */
.page-about .year-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
}

.page-about .year-jump a {
  font-family: var(--font-mono);
  font-size: 13.5px;
  padding: 7px 14px;
  color: var(--stone);
  border: 1px solid var(--line-strong);
  text-decoration: none;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .year-jump a:hover,
.page-about .year-jump a:focus-visible {
  color: var(--midnight);
  background: var(--lime);
  border-color: var(--lime);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, var(--clay), rgba(167, 179, 168, 0.14));
}

.page-about .tl-item {
  position: relative;
  padding-left: 34px;
  scroll-margin-top: calc(var(--header-h) + 40px);
}

.page-about .tl-item + .tl-item {
  margin-top: clamp(28px, 5vw, 46px);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--clay);
  box-shadow: 0 0 0 5px var(--pitch);
}

.page-about .about-section--panel .tl-item::before {
  box-shadow: 0 0 0 5px var(--turf);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 8.4vw, 70px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--clay);
}

.page-about .tl-title {
  margin: 10px 0 0;
  font-size: clamp(17px, 2.3vw, 21px);
  line-height: 1.45;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .tl-text {
  margin: 10px 0 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 团队 ---------- */
.page-about .crew {
  display: grid;
  gap: 30px;
  margin-top: 32px;
}

.page-about .crew-total {
  border-left: 2px solid var(--lime);
  padding-left: 16px;
}

.page-about .crew-total-num {
  font-family: var(--font-mono);
  font-size: clamp(50px, 10vw, 72px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.03em;
}

.page-about .crew-total .unit {
  color: var(--lime);
  opacity: 0.7;
}

.page-about .crew-total-note {
  margin: 10px 0 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .crew-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 24px;
}

.page-about .crew-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.page-about .crew-role {
  font-size: 16px;
  font-weight: 600;
  color: var(--chalk);
}

.page-about .crew-count {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--stone);
}

.page-about .crew-bar {
  margin-top: 10px;
  height: 6px;
  background: rgba(6, 23, 15, 0.6);
  overflow: hidden;
}

.page-about .crew-bar > span {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  background: linear-gradient(90deg, var(--moss), var(--clay));
}

.page-about .crew-note {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 内容体系 ---------- */
.page-about .sys-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 32px;
}

.page-about .sys-card {
  position: relative;
  padding: 26px 22px 24px;
  background: var(--turf);
  clip-path: polygon(22px 0, 100% 0, 100% 100%, 0 100%, 0 22px);
}

.page-about .sys-num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .sys-title {
  margin: 14px 0 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .sys-figure {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.35;
  color: var(--lime);
}

.page-about .sys-text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--stone);
}

/* ---------- 流程 ---------- */
.page-about .flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
  margin-top: 34px;
}

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

.page-about .flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.75) brightness(0.82);
}

.page-about .flow-caption {
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .steps::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 16px;
  bottom: 22px;
  width: 1px;
  background: linear-gradient(180deg, var(--moss), rgba(30, 92, 67, 0.16));
}

.page-about .step {
  position: relative;
  padding-left: 48px;
  padding-bottom: 26px;
}

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

.page-about .step-idx {
  position: absolute;
  left: 0;
  top: 0;
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--lime);
  background: var(--midnight);
  border: 1px solid var(--moss);
}

.page-about .step-title {
  margin: 2px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--chalk);
  transition: color var(--dur) var(--ease);
}

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

.page-about .step-text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--stone);
}

.page-about .step-out {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--clay);
}

/* ---------- 合作 ---------- */
.page-about .partner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 32px;
}

.page-about .partner-text {
  margin: 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--bone);
}

.page-about .award {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 26px;
  padding: 18px 20px;
  background: rgba(6, 23, 15, 0.45);
  border-left: 2px solid var(--orange);
}

.page-about .award-year {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--orange);
}

.page-about .award-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--bone);
}

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

.page-about .partner-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line-strong);
  filter: saturate(0.8) brightness(0.85);
}

/* ---------- 三件事 ---------- */
.page-about .pillars {
  margin-top: 30px;
  border-top: 1px solid var(--line-strong);
}

.page-about .pillar {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .pillar-idx {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .pillar-title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--chalk);
}

.page-about .pillar-text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--bone);
}

.page-about .hot {
  font-family: var(--font-mono);
  color: var(--orange);
}

.page-about .about-tail {
  margin: 30px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-tail a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 242, 74, 0.45);
  transition: border-color var(--dur) var(--ease);
}

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

.page-about .about-cta {
  margin-top: clamp(34px, 6vw, 60px);
  padding: clamp(26px, 5vw, 42px) clamp(22px, 4vw, 36px);
  background: linear-gradient(120deg, var(--midnight), var(--turf));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-cta-lede {
  margin: 0;
  max-width: 34ch;
  font-size: clamp(18px, 2.5vw, 23px);
  line-height: 1.55;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .sys-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .crew {
    grid-template-columns: 180px minmax(0, 1fr);
    align-items: start;
    gap: 44px;
  }
}

@media (min-width: 780px) {
  .page-about .pillar {
    grid-template-columns: 56px minmax(0, 230px) minmax(0, 1fr);
    align-items: start;
    gap: 26px;
    padding: 28px 0;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: end;
  }

  .page-about .about-hero-figure img {
    aspect-ratio: 7 / 4;
  }

  .page-about .flow {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  }

  .page-about .partner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
    gap: 40px;
  }
}

@media (min-width: 900px) {
  .page-about .about-row {
    grid-template-columns: 86px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    position: sticky;
    top: calc(var(--header-h) + 36px);
    align-self: start;
  }

  .page-about .rail-num {
    font-size: 30px;
    color: var(--moss);
  }

  .page-about .rail-line {
    flex: none;
    width: 1px;
    height: 64px;
    margin: 14px 0;
    background: linear-gradient(180deg, var(--moss), rgba(30, 92, 67, 0));
  }

  .page-about .rail-label {
    writing-mode: vertical-rl;
    letter-spacing: 0.36em;
    color: var(--clay);
  }

  .page-about .timeline {
    margin-top: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .step-title,
  .page-about .year-jump a,
  .page-about .breadcrumb-link,
  .page-about .about-tail a {
    transition: none;
  }
}

.page-about {
  --w: 1rem;
}