.page-about {
  --about-line: var(--cement-200);
  --about-soft: var(--cement-600);
  background: var(--cement-050);
  color: var(--ink-900);
  overflow-x: clip;
}

.page-about .container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about h2 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.4vw, 2.5rem);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 0.55em;
}

.page-about h3 {
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  font-weight: 700;
  line-height: 1.35;
  margin: 0;
}

.page-about p {
  line-height: 1.72;
  margin: 0 0 1em;
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal-700);
  margin: 0 0 14px;
}

.page-about .eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--signal-500);
  display: block;
}

/* 面包屑 */
.page-about .crumb {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

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

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

.page-about .crumb__list li + li::before {
  content: "/";
  opacity: 0.45;
}

.page-about .crumb a {
  color: inherit;
  text-decoration: none;
}

.page-about .crumb a:hover,
.page-about .crumb a:focus-visible {
  color: var(--signal-500);
}

/* 首屏 */
.page-about .about-hero {
  background:
    radial-gradient(circle at 88% 12%, rgba(46, 125, 79, 0.42), transparent 58%),
    var(--pitch-900);
  color: var(--cement-050);
  padding-block: 18px clamp(34px, 5.5vw, 76px);
}

.page-about .about-hero .crumb {
  color: rgba(247, 244, 236, 0.72);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 52px);
  margin-top: clamp(16px, 3vw, 32px);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 46px), 0 100%);
}

.page-about .about-hero__media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-about .about-hero__stamp {
  position: absolute;
  left: 0;
  bottom: 24px;
  background: var(--signal-500);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  padding: 6px 10px;
}

.page-about .about-hero .eyebrow {
  color: var(--score-400);
}

.page-about .about-hero .eyebrow::before {
  background: var(--signal-500);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 6.2vw, 4.4rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  font-weight: 900;
  margin: 0 0 0.5em;
}

.page-about .about-hero__sub {
  display: block;
  margin-top: 0.62em;
  font-size: clamp(0.95rem, 2vw, 1.24rem);
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0;
  color: var(--score-400);
  max-width: 24ch;
}

.page-about .about-hero__lede {
  max-width: 58ch;
  color: rgba(247, 244, 236, 0.86);
  font-size: clamp(0.98rem, 1.5vw, 1.06rem);
  margin: 0;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid rgba(226, 220, 205, 0.24);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  line-height: 1;
  color: var(--score-400);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 0.55em;
  font-size: 0.74rem;
  line-height: 1.5;
  color: rgba(247, 244, 236, 0.72);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero .btn--ghost {
  color: var(--cement-050);
  border-color: rgba(226, 220, 205, 0.45);
}

.page-about .about-hero .btn--ghost:hover,
.page-about .about-hero .btn--ghost:focus-visible {
  background: rgba(247, 244, 236, 0.12);
  color: var(--cement-050);
}

/* 通用区块 */
.page-about .about-block {
  padding-block: clamp(42px, 6.5vw, 96px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-origin {
  border-top: 0;
}

.page-about .about-head {
  max-width: 62ch;
  margin-bottom: clamp(20px, 3.5vw, 34px);
}

.page-about .about-stages__lede {
  color: var(--about-soft);
  max-width: 58ch;
}

/* 起点：四维度 */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(22px, 4vw, 48px);
}

.page-about .about-origin__text p {
  color: var(--about-soft);
  max-width: 60ch;
}

.page-about .about-axis {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-axis__item {
  background: var(--paper-000);
  border-top: 3px solid var(--pitch-500);
  padding: 18px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-axis__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--signal-700);
}

.page-about .about-axis__item h3 {
  margin: 0.5em 0 0.35em;
  font-size: 1.02rem;
}

.page-about .about-axis__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--about-soft);
}

/* 阶段时间线 */
.page-about .about-stages {
  background: linear-gradient(180deg, rgba(226, 220, 205, 0.42), rgba(247, 244, 236, 0) 62%);
  padding-block: clamp(44px, 6.5vw, 96px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-stage-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(20px, 3.5vw, 34px);
}

.page-about .about-stage-nav a {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  text-decoration: none;
  color: var(--ink-900);
  background: var(--paper-000);
  border: 1px solid var(--about-line);
  padding: 8px 12px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-stage-nav a:hover,
.page-about .about-stage-nav a:focus-visible {
  background: var(--signal-500);
  border-color: var(--signal-500);
  color: var(--ink-900);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-stage {
  display: grid;
  gap: 14px;
  background: var(--paper-000);
  border-left: 6px solid var(--signal-500);
  padding: clamp(18px, 3vw, 30px);
  box-shadow: var(--shadow-1);
  scroll-margin-top: calc(var(--topbar-h) + 20px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-stage--2 {
  border-left-color: var(--pitch-500);
}

.page-about .about-stage--3 {
  border-left-color: var(--pitch-700);
}

.page-about .about-stage__num {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 0.9;
  font-weight: 700;
  color: var(--signal-500);
}

.page-about .about-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--pitch-700);
  background: rgba(46, 125, 79, 0.12);
  padding: 4px 8px;
  margin: 0 0 10px;
}

.page-about .about-stage h3 {
  margin-bottom: 0.42em;
}

.page-about .about-stage__body p:last-child {
  margin: 0;
  color: var(--about-soft);
  font-size: 0.95rem;
}

/* 编辑台 */
.page-about .about-desk__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-desk__media {
  margin: 0;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 40px), 0 100%);
}

.page-about .about-desk__media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

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

.page-about .about-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  background: var(--paper-000);
  padding: 16px 18px;
  border-bottom: 2px solid var(--about-line);
}

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--signal-700);
  padding-top: 0.2em;
}

.page-about .about-step h3 {
  font-size: 1rem;
  margin-bottom: 0.3em;
}

.page-about .about-step p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--about-soft);
}

.page-about .about-desk__note {
  margin: clamp(16px, 2.5vw, 22px) 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--signal-500);
  font-size: 0.88rem;
  color: var(--about-soft);
}

/* 协作网络 */
.page-about .about-network__grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-network__grid > div > p {
  color: var(--about-soft);
}

.page-about .about-network__media {
  margin: 0;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-about .about-network__media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-inline-link {
  color: var(--signal-700);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--signal-500);
}

.page-about .about-statgrid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-stat {
  background: var(--pitch-900);
  color: var(--cement-050);
  padding: 16px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  line-height: 1;
  color: var(--score-400);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 0.55em;
  font-size: 0.78rem;
  line-height: 1.5;
  color: rgba(247, 244, 236, 0.8);
}

/* 团队 */
.page-about .about-team__grid {
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  background: var(--paper-000);
  border-top: 4px solid var(--pitch-700);
  padding: 20px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  transition: background 0.18s var(--ease);
}

.page-about .about-role__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3.6vw, 2.3rem);
  line-height: 1;
  color: var(--signal-500);
  transition: color 0.18s var(--ease);
}

.page-about .about-role__title {
  margin: 0.6em 0 0.4em;
  font-size: 1.05rem;
  transition: color 0.18s var(--ease);
}

.page-about .about-role__note {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--about-soft);
  transition: color 0.18s var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  background: var(--pitch-900);
}

.page-about .about-role:hover .about-role__num,
.page-about .about-role:focus-within .about-role__num {
  color: var(--score-400);
}

.page-about .about-role:hover .about-role__title,
.page-about .about-role:focus-within .about-role__title {
  color: var(--cement-050);
}

.page-about .about-role:hover .about-role__note,
.page-about .about-role:focus-within .about-role__note {
  color: rgba(247, 244, 236, 0.86);
}

/* 下一段坐标 */
.page-about .about-next__panel {
  background:
    radial-gradient(circle at 92% 0%, rgba(216, 255, 74, 0.16), transparent 52%),
    var(--pitch-900);
  color: var(--cement-050);
  padding: clamp(24px, 4.5vw, 56px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

.page-about .about-next .eyebrow {
  color: var(--score-400);
}

.page-about .about-next__panel h2 {
  color: var(--cement-050);
}

.page-about .about-next__panel > p {
  color: rgba(247, 244, 236, 0.84);
  max-width: 52ch;
}

.page-about .about-next__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  max-width: 60ch;
}

.page-about .about-next__list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  font-size: 0.94rem;
  line-height: 1.6;
  color: rgba(247, 244, 236, 0.86);
}

.page-about .about-next__list li::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-top: 0.55em;
  background: var(--score-400);
  display: block;
}

.page-about .about-next__actions {
  margin-top: clamp(22px, 3.5vw, 32px);
}

/* 页面出口 */
.page-about .about-links__grid {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-link {
  display: grid;
  gap: 6px;
  text-decoration: none;
  color: var(--ink-900);
  background: var(--paper-000);
  border: 1px solid var(--about-line);
  padding: 18px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-link__k {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--signal-700);
  transition: color 0.18s var(--ease);
}

.page-about .about-link__t {
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1.4;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  background: var(--signal-500);
  border-color: var(--signal-500);
  transform: translateY(-2px);
}

.page-about .about-link:hover .about-link__k,
.page-about .about-link:focus-visible .about-link__k {
  color: var(--ink-900);
}

/* 断点 */
@media (min-width: 560px) {
  .page-about .about-stage {
    grid-template-columns: auto 1fr;
    align-items: start;
  }

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

@media (min-width: 760px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: center;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-desk__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 20px 24px;
  }

  .page-about .about-stage--1 {
    grid-column: 1 / span 8;
  }

  .page-about .about-stage--2 {
    grid-column: 3 / span 8;
  }

  .page-about .about-stage--3 {
    grid-column: 2 / span 8;
  }
}

@media (min-width: 1000px) {
  .page-about .about-links__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-link,
  .page-about .about-stage-nav a {
    transition: none;
  }

  .page-about .about-link:hover,
  .page-about .about-link:focus-visible {
    transform: none;
  }
}
<<<END>>>