.page-about {
  --about-rail: 120px;
  --about-node: 11px;
  display: block;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: 28px 64px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  margin-top: 24px;
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 54px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--text);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  max-width: 34em;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-muted);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 28px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.page-about .about-hero__fact dt {
  order: 2;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.page-about .about-hero__fact dd {
  order: 1;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--rule);
  background: var(--surface-2);
  overflow: hidden;
}

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

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(12, 20, 48, 0) 42%, rgba(12, 20, 48, 0.62) 100%);
  pointer-events: none;
}

.page-about .about-hero__figure .media__cap {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--moon);
}

/* ---------- 服务对象 ---------- */
.page-about .about-audience__head {
  margin-bottom: 36px;
}

.page-about .about-audience__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-aud {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px 24px;
  border: 1px solid var(--rule);
}

.page-about .about-aud__idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-aud__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-aud__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-muted);
}

.page-about .about-aud__link {
  margin-top: auto;
  padding-top: 12px;
  font-size: 14px;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-aud__link::after {
  content: " →";
  font-family: var(--font-mono);
}

.page-about .about-aud__link:hover,
.page-about .about-aud__link:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-block: 72px;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
}

.page-about .about-team__title {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.012em;
  color: var(--text);
}

.page-about .about-team__lead {
  margin: 0 0 8px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-muted);
}

.page-about .about-team__roles {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-team__role {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-team__role::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 1px;
  width: var(--w, 30%);
  background: var(--gold);
}

.page-about .about-team__role:nth-child(1) { --w: 39%; }
.page-about .about-team__role:nth-child(2) { --w: 30%; }
.page-about .about-team__role:nth-child(3) { --w: 30%; }

.page-about .about-team__role-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-team__role-num {
  align-self: center;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .about-team__role-desc {
  grid-column: 1 / -1;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-muted);
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--rule);
  background: var(--surface-2);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team__figure .media__cap {
  margin: 0;
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding-block: 72px;
  position: relative;
}

.page-about .about-timeline__head {
  margin-bottom: 32px;
}

.page-about .about-timeline__texture {
  margin: 0 0 44px;
  border: 1px solid var(--rule);
  background: var(--surface-2);
  overflow: hidden;
  aspect-ratio: 12 / 5;
}

.page-about .about-timeline__texture img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-timeline__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-timeline__rail {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-timeline__rail-label {
  display: none;
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--text-muted);
}

.page-about .about-timeline__rail ol {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__rail a {
  display: block;
  padding: 6px 10px;
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-about .about-timeline__rail a:hover,
.page-about .about-timeline__rail a:focus-visible {
  color: var(--gold);
  border-left-color: var(--gold);
  background: var(--indigo-800);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 4px 0 0 28px;
  position: relative;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 24px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--gold) 30%, var(--rule) 62%, var(--rule) 100%);
  opacity: 0.85;
}

.page-about .about-stage {
  position: relative;
  padding-bottom: 24px;
  scroll-margin-top: 96px;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 20px;
  width: var(--about-node);
  height: var(--about-node);
  background: var(--gold);
  transform: rotate(45deg);
  transition: background var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.page-about .about-stage:hover::before {
  background: var(--gold-soft);
  box-shadow: 0 0 0 6px rgba(201, 162, 39, 0.16);
}

.page-about .about-stage__card {
  padding: 20px 22px 22px;
  border: 1px solid var(--rule);
  background: var(--surface-2);
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-about .about-stage__card:hover {
  border-color: var(--gold-deep);
}

.page-about .about-stage__card:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-about .about-stage__meta {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cinnabar);
}

.page-about .about-stage__meta .mono {
  color: var(--gold);
  font-size: 13px;
}

.page-about .about-stage__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-stage__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-muted);
}

.page-about .about-stage__more {
  margin: 0;
  max-height: 0;
  padding-top: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-muted);
  border-left: 1px solid var(--gold-deep);
  padding-left: 0;
  transition: max-height var(--t-mid) var(--ease), opacity var(--t-fast) var(--ease),
    padding-top var(--t-mid) var(--ease), padding-left var(--t-mid) var(--ease);
}

.page-about .about-stage:hover .about-stage__more,
.page-about .about-stage__card:focus-within .about-stage__more {
  max-height: 160px;
  opacity: 1;
  padding-top: 10px;
  padding-left: 12px;
}

.page-about .about-stage:target .about-stage__card {
  border-color: var(--gold);
  box-shadow: inset 0 0 0 1px var(--gold-soft);
}

/* ---------- 文档标准（浅色带） ---------- */
.page-about .about-docs {
  padding-block: 72px;
}

.page-about .about-docs__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
}

.page-about .about-docs__title {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.012em;
  color: var(--text);
}

.page-about .about-docs__lead {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-muted);
}

.page-about .about-docs__stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 26px 0 28px;
}

.page-about .about-docs__stat {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 0 14px;
  align-items: start;
  padding: 14px 16px;
  background: rgba(12, 20, 48, 0.05);
  border-left: 2px solid var(--gold);
}

.page-about .about-docs__stat-num {
  font-size: 30px;
  line-height: 1;
  font-weight: 500;
  color: var(--ink);
}

.page-about .about-docs__stat p {
  margin: 0;
  font-size: 13px;
  line-height: 1.78;
  color: var(--ink);
  opacity: 0.78;
}

.page-about .about-docs__cta {
  display: inline-block;
}

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

.page-about .about-docs__step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 2px 14px;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
}

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

.page-about .about-docs__step-idx {
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gold-deep);
}

.page-about .about-docs__step h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-docs__step p {
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
  opacity: 0.75;
}

/* ---------- 归属与联系 ---------- */
.page-about .about-origin {
  padding-block: 72px 88px;
}

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

.page-about .about-origin__title {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.012em;
  color: var(--text);
}

.page-about .about-origin__lead {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-muted);
}

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

.page-about .about-origin__card {
  padding: 26px 24px;
  border: 1px solid var(--rule);
  background: linear-gradient(152deg, rgba(23, 32, 74, 0.9) 0%, rgba(12, 20, 48, 0.72) 100%);
  backdrop-filter: blur(8px);
}

.page-about .about-origin__card-title {
  margin: 0 0 18px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .about-origin__contact {
  margin: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-origin__item {
  display: block;
}

.page-about .about-origin__contact dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.page-about .about-origin__contact dd {
  margin: 5px 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-origin__value {
  word-break: break-word;
}

.page-about .about-origin__contact .copy-chip {
  flex: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-audience__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-block: 40px 88px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 40px;
    align-items: end;
  }

  .page-about .about-hero__intro {
    grid-column: span 7;
  }

  .page-about .about-hero__figure {
    grid-column: span 5;
  }

  .page-about .about-hero__figure img {
    aspect-ratio: 4 / 3;
    height: 100%;
  }

  .page-about .about-audience__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-aud:nth-child(1) {
    grid-column: span 5;
  }

  .page-about .about-aud:nth-child(2) {
    grid-column: span 4;
    margin-top: 32px;
  }

  .page-about .about-aud:nth-child(3) {
    grid-column: span 3;
    margin-top: 64px;
  }

  .page-about .about-team {
    padding-block: 96px;
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 48px;
    align-items: start;
  }

  .page-about .about-team__text {
    grid-column: span 7;
  }

  .page-about .about-team__figure {
    grid-column: span 5;
    margin-top: 48px;
  }

  .page-about .about-timeline {
    padding-block: 96px;
  }

  .page-about .about-timeline__body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-timeline__rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    overflow: visible;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .about-timeline__rail-label {
    display: block;
    margin-bottom: 14px;
  }

  .page-about .about-timeline__rail ol {
    flex-direction: column;
    gap: 2px;
    border-left: 1px solid var(--rule);
  }

  .page-about .about-timeline__rail a {
    padding: 9px 12px;
    border-left: 2px solid transparent;
    margin-left: -1px;
  }

  .page-about .about-stage__card {
    max-width: 100%;
  }

  .page-about .about-stage:nth-child(even) .about-stage__card {
    margin-left: 8%;
    width: 92%;
  }

  .page-about .about-stage:nth-child(3) .about-stage__card {
    width: 86%;
  }

  .page-about .about-stage:nth-child(5) .about-stage__card {
    margin-left: 4%;
    width: 90%;
  }

  .page-about .about-docs {
    padding-block: 96px;
  }

  .page-about .about-docs__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 56px;
    align-items: start;
  }

  .page-about .about-docs__intro {
    grid-column: span 5;
  }

  .page-about .about-docs__steps {
    grid-column: span 7;
  }

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

  .page-about .about-origin {
    padding-block: 96px 112px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 56px;
    align-items: start;
  }

  .page-about .about-origin__main {
    grid-column: span 7;
  }

  .page-about .about-origin__card {
    grid-column: span 5;
  }
}

@media (hover: none) {
  .page-about .about-stage__more {
    max-height: none;
    opacity: 1;
    padding-top: 10px;
    padding-left: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage::before,
  .page-about .about-stage__card,
  .page-about .about-stage__more,
  .page-about .about-aud__link,
  .page-about .about-timeline__rail a {
    transition: none;
  }

  .page-about .about-stage__more {
    max-height: none;
    opacity: 1;
    padding-top: 10px;
    padding-left: 12px;
  }
}