.page-about {
  --about-line: rgba(159, 179, 200, .18);
  --about-line-soft: rgba(159, 179, 200, .1);
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: calc(var(--header-h) + 1.25rem);
  padding-bottom: .25rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 1.5rem;
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -10%;
  right: -12%;
  width: min(58vw, 720px);
  height: min(58vw, 720px);
  background: linear-gradient(135deg, rgba(45, 212, 191, .16), rgba(37, 99, 235, .05) 55%, transparent 72%);
  clip-path: polygon(28% 0, 100% 0, 100% 72%, 0 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
}

.page-about .about-hero-copy h1 {
  margin: .5rem 0 1rem;
  font-size: clamp(2rem, 7vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -.02em;
  font-weight: 900;
  max-width: 18ch;
}

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

.page-about .about-hero-points {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: .6rem;
  border-left: 1px solid var(--gold);
  padding-left: 1rem;
  font-size: .95rem;
  color: var(--text-dim);
}

.page-about .about-hero-points .mono {
  color: var(--gold);
  font-size: 1.05rem;
  margin-right: .35rem;
}

.page-about .about-hero-media {
  position: relative;
  margin: 0;
  box-shadow: 0 18px 40px -28px rgba(0, 0, 0, .9);
}

.page-about .about-hero-media .annot {
  position: absolute;
  right: -0.5rem;
  bottom: 1rem;
  color: var(--text-dim);
}

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

/* ---------- 通用 section 间距 ---------- */
.page-about .section {
  padding-top: clamp(3.5rem, 8vw, 6rem);
  padding-bottom: clamp(3.5rem, 8vw, 6rem);
}

/* ---------- 使命 / Bento ---------- */
.page-about .about-mission-bento {
  display: grid;
  gap: 1rem;
  margin-top: 2.25rem;
}

.page-about .about-mission-main {
  border-top: 2px solid var(--gold);
}

.page-about .about-mission-bento h3 {
  font-size: 1.15rem;
  margin: 0 0 .6rem;
  letter-spacing: -.01em;
}

.page-about .about-mission-bento p {
  margin: 0;
  color: var(--text-dim);
  font-size: .95rem;
}

.page-about .about-mission-note {
  border-left: 2px solid var(--cyan-start);
}

.page-about .about-mission-note .annot {
  color: var(--gold);
  display: block;
  margin-bottom: .5rem;
}

.page-about .about-mission-note p:last-child {
  color: var(--text);
  font-size: .93rem;
}

/* ---------- 团队分工 ---------- */
.page-about .about-teams-layout {
  display: grid;
  gap: 1.75rem;
  margin-top: 2.25rem;
}

.page-about .about-teams-list {
  display: grid;
  gap: 1px;
  background: var(--about-line-soft);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .team-card {
  background: var(--ink-900);
  padding: 1.35rem 0;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "idx title"
    "idx text";
  column-gap: 1rem;
  row-gap: .35rem;
  transition: background .3s var(--ease);
}

.page-about .team-card:hover {
  background: var(--ink-850);
}

.page-about .team-card-index {
  grid-area: idx;
  margin: 0;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ink-700);
  -webkit-text-stroke: 1px var(--gold);
  line-height: 1;
}

.page-about .team-card h3 {
  grid-area: title;
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: -.01em;
}

.page-about .team-card p:last-child {
  grid-area: text;
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-teams-media {
  margin: 0;
  position: relative;
}

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

.page-about .about-teams-media .annot {
  display: block;
  margin-top: .6rem;
  color: var(--text-dim);
}

.page-about .about-archive-strip {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .archive-item {
  background: var(--ink-850);
  padding: 1.1rem 1rem;
}

.page-about .archive-num {
  margin: 0;
  font-size: clamp(1.4rem, 4.5vw, 1.9rem);
  font-weight: 700;
  color: var(--gold);
  line-height: 1.1;
}

.page-about .archive-label {
  margin: .35rem 0 0;
  font-size: .82rem;
  color: var(--text-dim);
}

/* ---------- 发展历程 ---------- */
.page-about .history-track {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0 0 0 1.5rem;
  position: relative;
  display: grid;
  gap: 1.75rem;
}

.page-about .history-track::before {
  content: "";
  position: absolute;
  left: 3px;
  top: .4rem;
  bottom: .4rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-start), var(--cyan-end) 70%, var(--signal));
}

.page-about .history-node {
  position: relative;
  padding-left: .25rem;
}

.page-about .history-node::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: .45rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan-start);
}

.page-about .history-node.is-current::before {
  background: var(--signal);
  border-color: var(--signal);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, .16);
}

.page-about .history-version {
  margin: 0;
  font-size: .8rem;
  letter-spacing: .18em;
  color: var(--text-dim);
}

.page-about .history-node.is-current .history-version {
  color: var(--signal);
}

.page-about .history-node h3 {
  margin: .3rem 0 .45rem;
  font-size: 1.08rem;
  letter-spacing: -.01em;
}

.page-about .history-node p:last-child {
  margin: 0;
  font-size: .93rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-history-media {
  margin: 2.5rem 0 0;
  position: relative;
}

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

.page-about .about-history-media .annot {
  display: block;
  margin-top: .6rem;
  color: var(--text-dim);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partner-grid {
  margin-top: 2.25rem;
}

.page-about .partner-card {
  background: linear-gradient(160deg, rgba(18, 58, 90, .5), rgba(14, 42, 68, .25));
  border: 1px solid var(--about-line);
  padding: 1.4rem 1.3rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .6rem;
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .partner-card:hover {
  border-color: rgba(214, 161, 91, .5);
  transform: translateY(-2px);
}

.page-about .partner-tag {
  margin: 0;
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .partner-card h3 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: -.01em;
}

.page-about .partner-card p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .text-link {
  margin-top: auto;
  padding-top: .5rem;
  font-size: .88rem;
  color: var(--cyan-start);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  align-self: flex-start;
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  border-bottom-color: var(--cyan-start);
}

.page-about .about-honors {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--about-line);
}

.page-about .about-honors .annot {
  display: block;
  margin-bottom: .9rem;
  color: var(--text-dim);
}

.page-about .honor-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .75rem;
}

.page-about .honor-list li {
  display: flex;
  aligned-items: baseline;
  gap: .9rem;
  align-items: baseline;
}

.page-about .honor-year {
  color: var(--signal);
  font-size: .9rem;
  flex: 0 0 auto;
}

.page-about .honor-text {
  font-size: .95rem;
  letter-spacing: -.005em;
}

/* ---------- 联系 CTA ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
}

.page-about .about-cta-shell {
  position: relative;
  display: grid;
  gap: 1.75rem;
  padding: clamp(1.75rem, 5vw, 3rem);
  background: linear-gradient(120deg, rgba(18, 58, 90, .75), rgba(7, 26, 43, .9));
  border: 1px solid var(--about-line);
}

.page-about .about-cta-shell::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--gold), var(--signal));
}

.page-about .about-cta-copy h2 {
  margin: .4rem 0 .9rem;
  font-size: clamp(1.5rem, 4.8vw, 2.1rem);
  letter-spacing: -.02em;
}

.page-about .about-cta-copy p {
  margin: 0;
  max-width: 60ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-archive-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 2.5rem;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .85fr);
    align-items: center;
    gap: 3rem;
  }

  .page-about .about-hero-media {
    transform: translateY(1.25rem);
  }

  .page-about .about-mission-bento {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-mission-main {
    grid-column: span 2;
    grid-row: span 1;
  }

  .page-about .about-mission-note {
    grid-column: span 3;
  }

  .page-about .about-teams-layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .9fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .about-teams-media {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }

  .page-about .history-track {
    padding-left: 2rem;
  }

  .page-about .about-cta-shell {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .8fr);
    align-items: center;
  }

  .page-about .about-cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-about .about-mission-bento {
    grid-template-columns: 1.5fr 1fr 1fr;
    grid-template-rows: auto auto;
  }

  .page-about .about-mission-main {
    grid-column: 1;
    grid-row: 1 / span 2;
  }

  .page-about .about-mission-note {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .partner-card,
  .page-about .team-card {
    transition: none;
  }
  .page-about .partner-card:hover {
    transform: none;
  }
}