.page-about {
  padding: 24px 18px 88px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-about a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 242, 224, .32);
  transition: border-color .24s var(--ease), color .24s var(--ease);
}

.page-about a:hover {
  color: var(--amber);
  border-bottom-color: rgba(245, 196, 81, .55);
}

.page-about .crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 26px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .crumb a {
  color: var(--muted);
  border-bottom: 0;
}

.page-about .crumb a:hover {
  color: var(--cyan);
}

.page-about .crumb__sep {
  color: var(--line-strong);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-size: 11.5px;
  letter-spacing: .26em;
  color: var(--orange);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 6vw, 56px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.88;
  color: var(--muted);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--line);
}

.page-about .ab-stat {
  padding: 15px 13px;
  background: var(--ink-2);
}

.page-about .ab-stat__label {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .ab-stat__value {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 3px;
  color: var(--amber);
}

.page-about .ab-stat__num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
}

.page-about .ab-stat__unit {
  font-size: 12.5px;
  color: var(--muted);
}

.page-about .about-hero__figure {
  margin: 32px 0 0;
}

.page-about .img-frame {
  overflow: hidden;
  border-radius: var(--radius);
}

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

/* ---------- 区块通用 ---------- */

.page-about .about-sec {
  margin-top: 68px;
}

.page-about .sec-head {
  margin-bottom: 30px;
}

.page-about .sec-head__num {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: .26em;
  color: var(--orange);
}

.page-about .sec-head__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .sec-head__desc {
  margin: 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  gap: 14px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(140deg, var(--phase-tint), transparent 68%), var(--ink-2);
  transition: border-color .28s var(--ease), transform .28s var(--ease);
}

.page-about .tl-item:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--phase-bright), transparent);
}

.page-about .tl-item--a {
  --phase-bright: #2FBFAE;
  --phase-tint: rgba(47, 191, 174, .16);
}

.page-about .tl-item--b {
  --phase-bright: #9B6BFF;
  --phase-tint: rgba(155, 107, 255, .16);
}

.page-about .tl-item--c {
  --phase-bright: #FF8A3C;
  --phase-tint: rgba(255, 138, 60, .13);
}

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

.page-about .tl-num {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--phase-bright);
}

.page-about .tl-vert {
  font-size: 12.5px;
  letter-spacing: .28em;
  color: var(--muted);
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18.5px;
  line-height: 1.5;
  color: var(--text);
}

.page-about .tl-body p {
  margin: 0 0 12px;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.86;
  color: var(--muted);
}

.page-about .tl-body p:last-child {
  margin-bottom: 0;
}

.page-about .tl-mile {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: 14.5px;
  color: var(--text);
}

.page-about .tl-mile__k {
  flex: 0 0 auto;
  padding: 2px 8px;
  border: 1px solid currentColor;
  border-radius: 3px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--phase-bright);
}

.page-about .about-break {
  margin: 28px 0 0;
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  display: grid;
  gap: 24px;
}

.page-about .about-team__roles {
  display: grid;
  gap: 12px;
}

.page-about .role {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(16, 23, 54, .74);
  transition: border-color .28s var(--ease), transform .28s var(--ease), background .28s var(--ease);
}

.page-about .role:hover {
  border-color: var(--line-strong);
  background: rgba(27, 42, 99, .58);
  transform: translateY(-3px);
}

.page-about .role__name {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
}

.page-about .role__count {
  font-size: 22px;
  font-weight: 700;
  color: var(--amber);
}

.page-about .role__desc {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--muted);
}

.page-about .role__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  opacity: .5;
  transition: opacity .3s var(--ease);
}

.page-about .role:hover .role__tags {
  opacity: 1;
}

.page-about .about-team__figure {
  margin: 0;
}

/* ---------- 内容准则 ---------- */

.page-about .about-rules__grid {
  display: grid;
  gap: 26px;
}

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

.page-about .rule {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .rule__num {
  flex: 0 0 auto;
  padding-top: 4px;
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--accent-jade);
}

.page-about .rule__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  color: var(--text);
}

.page-about .rule__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-quote {
  margin: 0;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent-jade);
  border-radius: var(--radius);
  background: linear-gradient(155deg, rgba(14, 79, 74, .42), rgba(16, 23, 54, .62) 62%);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-glass);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--text);
}

/* ---------- 协作生态 ---------- */

.page-about .eco-list {
  display: grid;
  gap: 12px;
}

.page-about .eco-item {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--eco, var(--cyan));
  border-radius: var(--radius);
  background: var(--ink-2);
  transition: border-color .28s var(--ease), transform .28s var(--ease);
}

.page-about .eco-item:hover {
  border-color: var(--line-strong);
  border-top-color: var(--eco, var(--cyan));
  transform: translateY(-3px);
}

.page-about .eco-item--a { --eco: var(--accent-jade); }
.page-about .eco-item--b { --eco: var(--accent-violet); }
.page-about .eco-item--c { --eco: var(--orange); }
.page-about .eco-item--d { --eco: var(--accent-wine); }

.page-about .eco-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  color: var(--text);
}

.page-about .eco-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--muted);
}

.page-about .eco-foot {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 成果 ---------- */

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .ab-metric {
  position: relative;
  overflow: hidden;
  padding: 20px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.page-about .ab-metric::after {
  content: "";
  position: absolute;
  right: -34px;
  bottom: -52px;
  width: 116px;
  height: 116px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245, 196, 81, .2), transparent 70%);
  pointer-events: none;
}

.page-about .ab-metric__num {
  margin: 0 0 6px;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .ab-metric__unit {
  font-size: 13px;
  font-weight: 400;
  color: var(--muted);
}

.page-about .ab-metric__label {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-awards {
  margin-top: 26px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent-violet);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(58, 26, 107, .38), rgba(16, 23, 54, .55) 66%);
}

.page-about .about-awards__lead {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

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

.page-about .about-awards__list li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-awards__list .mono {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--amber);
}

/* ---------- 未来方向 ---------- */

.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .next-item {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-bottom: 3px solid var(--n, var(--cyan));
  border-radius: var(--radius);
  background: linear-gradient(165deg, var(--n-tint), transparent 72%), var(--ink-2);
}

.page-about .next-item--jade { --n: var(--accent-jade); --n-tint: rgba(47, 191, 174, .14); }
.page-about .next-item--violet { --n: var(--accent-violet); --n-tint: rgba(155, 107, 255, .15); }
.page-about .next-item--orange { --n: var(--orange); --n-tint: rgba(255, 138, 60, .12); }

.page-about .next-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  color: var(--text);
}

.page-about .next-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--muted);
}

.page-about .about-next__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-next__cta .btn {
  border-bottom: 0;
}

.page-about .about-next__cta .btn:hover {
  border-bottom: 0;
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about {
    padding: 36px 28px 104px;
  }

  .page-about .about-sec {
    margin-top: 96px;
  }

  .page-about .tl-item {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
    padding: 28px 28px 28px 32px;
  }

  .page-about .tl-marker {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding-top: 4px;
  }

  .page-about .tl-vert {
    writing-mode: vertical-rl;
    letter-spacing: .34em;
  }

  .page-about .about-rules__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr);
    gap: 36px;
    align-items: start;
  }

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

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.92fr);
    gap: 44px;
    align-items: end;
  }

  .page-about .about-hero__stats {
    margin-bottom: 6px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, 0.88fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .tl-item--b {
    margin-left: 28px;
  }

  .page-about .tl-item--c {
    margin-left: 14px;
  }
}

@media (min-width: 1100px) {
  .page-about {
    max-width: calc(var(--maxw) + var(--rail-w));
    padding: 48px 40px 132px calc(var(--rail-w) + 40px);
  }
}