.page-about {
  --ab-rail: 76px;
  --ab-pad-block: clamp(48px, 8vw, 96px);
  display: block;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
}

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

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumbs li[aria-current] {
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(26px, 4vw, 44px) clamp(40px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -28%;
  right: -12%;
  width: min(540px, 62vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 32%, rgba(198, 255, 61, 0.16), rgba(198, 255, 61, 0) 66%);
  pointer-events: none;
}

.page-about .about-hero .wrap {
  position: relative;
}

.page-about .about-hero__body {
  margin-top: clamp(24px, 4vw, 40px);
  max-width: 1000px;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(38px, 9vw, 92px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.75;
  color: var(--white);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(30px, 4.5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2.4vw, 24px);
}

.page-about .about-stats__item {
  padding-top: 14px;
  border-top: 2px solid var(--lime);
  min-width: 0;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-stats__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 通用区段 ---------- */
.page-about .about-stages,
.page-about .about-team,
.page-about .about-data,
.page-about .about-pledge,
.page-about .about-recog,
.page-about .about-cta {
  padding-block: var(--ab-pad-block);
}

.page-about .about-team,
.page-about .about-data,
.page-about .about-pledge,
.page-about .about-recog,
.page-about .about-cta {
  border-top: 1px solid var(--line);
}

.page-about h2 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .lede {
  max-width: 60ch;
}

/* ---------- 阶段定位条 ---------- */
.page-about .stage-jump {
  display: flex;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
  padding-bottom: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

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

.page-about .stage-jump__link {
  flex: 0 0 auto;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .stage-jump__link:hover,
.page-about .stage-jump__link:focus-visible {
  color: var(--night);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-stages__figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

.page-about .about-stages__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
}

/* ---------- 阶段条目 ---------- */
.page-about .stage {
  display: grid;
  gap: 14px;
  padding-block: clamp(30px, 4.5vw, 52px);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 88px;
}

.page-about .stage__year {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(17px, 2vw, 23px);
  line-height: 1.2;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .stage__body {
  min-width: 0;
  max-width: 64ch;
}

.page-about .stage__body h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .stage__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--white);
}

.page-about .stage__events {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .stage__events li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
  transition: color 0.26s var(--ease);
}

.page-about .stage__events li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 2px;
  background: var(--line);
  transition: width 0.28s var(--ease), background-color 0.28s var(--ease);
}

.page-about .stage:hover .stage__events li,
.page-about .stage:focus-within .stage__events li {
  color: var(--white);
}

.page-about .stage:hover .stage__events li::before,
.page-about .stage:focus-within .stage__events li::before {
  width: 13px;
  background: var(--alert);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
  margin-top: clamp(4px, 1vw, 12px);
}

.page-about .team-grid__text {
  min-width: 0;
}

.page-about .team-grid__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--white);
}

.page-about .team-grid__figure {
  margin: 0;
}

.page-about .team-grid__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.page-about .media-frame__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .roles {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .role {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--stand);
}

.page-about .role__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 22px;
  line-height: 1;
  color: var(--lime);
}

.page-about .role__name {
  font-size: 14px;
  color: var(--white);
}

/* ---------- 数据来源 ---------- */
.page-about .data-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
  margin-top: clamp(16px, 2.4vw, 26px);
}

.page-about .data-grid__figure {
  margin: 0;
}

.page-about .data-grid__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.page-about .data-grid__text {
  min-width: 0;
}

.page-about .data-grid__text > p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--white);
}

.page-about .data-facts {
  margin: clamp(18px, 3vw, 26px) 0 0;
  display: grid;
  gap: 12px;
}

.page-about .data-facts > div {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .data-facts dt {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .data-facts dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--white);
}

/* ---------- 三件事 ---------- */
.page-about .pledges {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
}

.page-about .pledge {
  display: grid;
  gap: 8px;
  padding-block: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--line);
}

.page-about .pledge:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .pledge__idx {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1;
  color: var(--lime-deep);
}

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

.page-about .pledge__body h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(19px, 2.3vw, 25px);
  line-height: 1.25;
  color: var(--white);
}

.page-about .pledge__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--white);
}

/* ---------- 认可与合作 ---------- */
.page-about .recog-grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
  margin-top: clamp(16px, 2.4vw, 26px);
}

.page-about .recog-card {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--stand);
}

.page-about .recog-card--award {
  border-color: rgba(111, 227, 210, 0.35);
  background: linear-gradient(152deg, rgba(111, 227, 210, 0.12), rgba(18, 41, 63, 1) 62%);
}

.page-about .recog-card ul {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .recog-card li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--white);
}

.page-about .recog-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
}

.page-about .recog-card--award li::before {
  background: var(--cyan);
}

.page-about .recog-card strong {
  font-weight: 700;
}

.page-about .recog-card a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  background: linear-gradient(180deg, rgba(198, 255, 61, 0.07), rgba(11, 27, 43, 0));
}

.page-about .about-cta__inner {
  max-width: 780px;
}

.page-about .about-cta p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--white);
}

.page-about .about-cta p a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

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

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

@media (min-width: 780px) {
  .page-about .pledge {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: clamp(18px, 3vw, 36px);
    align-items: start;
  }
}

@media (min-width: 860px) {
  .page-about .stage {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 40px);
  }

  .page-about .stage__year {
    writing-mode: vertical-rl;
    letter-spacing: 0.16em;
  }

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

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(28px, 4.5vw, 56px);
  }

  .page-about .data-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }
}

@media (max-width: 480px) {
  .page-about .about-stats__num {
    font-size: 22px;
  }

  .page-about .role {
    padding: 12px 14px;
  }
}