.page-about {
  --ab-hair: rgba(53, 224, 216, 0.13);
  --ab-hair-soft: rgba(53, 224, 216, 0.07);
  --ab-panel: linear-gradient(152deg, rgba(20, 27, 71, 0.92), rgba(11, 16, 48, 0.78));
  position: relative;
  isolation: isolate;
  color: var(--white);
  background-color: var(--bg-900);
  background-image:
    radial-gradient(88% 58% at 88% 0%, rgba(53, 224, 216, 0.13), transparent 58%),
    radial-gradient(76% 52% at 2% 32%, rgba(255, 122, 47, 0.085), transparent 60%),
    radial-gradient(120% 88% at 50% 106%, rgba(15, 42, 82, 0.9), transparent 72%);
  background-repeat: no-repeat;
  overflow-x: hidden;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(92px, 15vw, 176px);
  padding-bottom: clamp(30px, 5vw, 56px);
}

.page-about .breadcrumb {
  margin: 0 0 clamp(20px, 3vw, 32px);
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--slate);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(140, 150, 196, 0.55);
}

.page-about .breadcrumb a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: rgba(53, 224, 216, 0.55);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 18ch;
  font-size: clamp(2.05rem, 6.2vw, 4.35rem);
  line-height: 1.08;
  letter-spacing: -0.024em;
  font-weight: 900;
  color: var(--white);
  background-image: linear-gradient(98deg, #F2F6FF 6%, #A7F3EF 58%, #35E0D8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

@supports not ((-webkit-background-clip: text) or (background-clip: text)) {
  .page-about .about-hero h1 {
    background-image: none;
    color: var(--white);
    -webkit-text-fill-color: currentColor;
  }
}

.page-about .lead {
  max-width: 64ch;
  font-size: clamp(1rem, 1.5vw, 1.14rem);
  line-height: 1.88;
  color: var(--slate);
}

/* ---------- 数字带 ---------- */
.page-about .stat-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(34px, 6vw, 60px) 0 0;
  padding: 0;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-md);
  background-color: var(--ab-hair);
  overflow: hidden;
}

.page-about .stat-band > div {
  padding: clamp(16px, 2.6vw, 26px) clamp(16px, 2.4vw, 24px);
  background-image: var(--ab-panel);
}

.page-about .stat-band dt {
  margin: 0 0 10px;
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .stat-band dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.15rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--cyan);
}

.page-about .stat-band .unit {
  font-family: var(--font-sans);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--slate);
}

/* ---------- 时间轴 ---------- */
.page-about .tl-figure {
  margin: clamp(28px, 4.4vw, 48px) 0 0;
}

.page-about .tl-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  margin-top: clamp(30px, 5vw, 56px);
}

.page-about .tl-rail {
  display: none;
}

.page-about .tl-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(13px, 2.2vw, 20px);
}

.page-about .tl-card {
  border-radius: var(--radius-md);
  background-image: var(--ab-panel);
  box-shadow: var(--glow-idle);
  overflow: hidden;
  transition: box-shadow 240ms var(--ease);
}

.page-about .tl-card:hover {
  box-shadow: var(--glow-active);
}

.page-about .tl-card > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding: clamp(16px, 2.4vw, 22px) clamp(18px, 3vw, 28px);
  cursor: pointer;
  list-style: none;
}

.page-about .tl-card > summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-card > summary::marker {
  content: "";
}

.page-about .tl-card > summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
  border-radius: var(--radius-md);
}

.page-about .tl-code {
  flex: none;
  padding: 3px 10px;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--cyan-soft);
}

.page-about .tl-title {
  flex: 1 1 200px;
  font-size: clamp(1rem, 2.05vw, 1.16rem);
  font-weight: 700;
  line-height: 1.48;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .tl-toggle {
  position: relative;
  flex: none;
  align-self: center;
  width: 14px;
  height: 14px;
  margin-left: auto;
}

.page-about .tl-toggle::before,
.page-about .tl-toggle::after {
  content: "";
  position: absolute;
  background-color: var(--cyan);
  border-radius: 2px;
}

.page-about .tl-toggle::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-about .tl-toggle::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
  transition: transform 220ms var(--ease);
}

.page-about .tl-card[open] .tl-toggle::after {
  transform: scaleY(0);
}

.page-about .tl-body {
  padding: 0 clamp(18px, 3vw, 28px) clamp(18px, 2.6vw, 24px);
  border-top: 1px solid var(--ab-hair-soft);
  margin-top: -1px;
}

.page-about .tl-body p {
  margin: 15px 0 0;
  font-size: 0.93rem;
  line-height: 1.86;
  color: var(--slate);
}

.page-about .tl-metric {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 16px !important;
  padding: 8px 15px;
  border-radius: var(--radius-pill);
  background-color: rgba(53, 224, 216, 0.07);
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--cyan-soft);
}

.page-about .tl-metric .mono {
  font-family: var(--font-mono);
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .team-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4.4vw, 52px);
  align-items: start;
  margin-top: clamp(28px, 4.4vw, 46px);
}

.page-about .team-copy > p {
  margin: 0 0 clamp(22px, 3.4vw, 32px);
  font-size: 0.98rem;
  line-height: 1.92;
  color: var(--slate);
}

.page-about .team-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.2vw, 20px);
}

.page-about .team-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: clamp(16px, 2.6vw, 22px) clamp(16px, 2.6vw, 24px);
  border-radius: var(--radius-md);
  background-image: var(--ab-panel);
  box-shadow: var(--glow-idle);
}

.page-about .step-no {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .team-steps h3 {
  margin: 0 0 8px;
  font-size: 1.04rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .team-steps p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.84;
  color: var(--slate);
}

.page-about .team-link {
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding-left: 16px;
  border-left: 2px solid rgba(255, 122, 47, 0.5);
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .team-link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 216, 0.4);
  transition: border-color 180ms var(--ease);
}

.page-about .team-link a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 引用句 ---------- */
.page-about .about-quote {
  margin: clamp(34px, 5.4vw, 62px) 0;
  padding: 0 0 0 clamp(18px, 3.4vw, 34px);
  border-left: 2px solid var(--cyan);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 24ch;
  font-size: clamp(1.45rem, 4.4vw, 2.6rem);
  line-height: 1.3;
  letter-spacing: -0.024em;
  font-weight: 800;
  color: var(--cyan-soft);
}

/* ---------- 信息来源 ---------- */
.page-about .source-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4.6vw, 56px);
  align-items: center;
}

.page-about .source-figure {
  margin: 0;
}

.page-about .source-map {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  margin: 0 auto;
}

.page-about .src-label {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  fill: #8C96C4;
}

.page-about .src-label--strong {
  fill: #35E0D8;
  font-weight: 700;
}

.page-about .source-figure figcaption {
  margin-top: 18px;
  font-size: 0.8rem;
  line-height: 1.72;
  text-align: center;
  color: var(--slate);
}

.page-about .source-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(11px, 1.8vw, 16px);
}

.page-about .source-legend li {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 12px;
  padding: clamp(15px, 2.4vw, 20px) clamp(16px, 2.4vw, 22px);
  border-radius: var(--radius-sm);
  background-image: linear-gradient(140deg, rgba(20, 27, 71, 0.86), rgba(11, 16, 48, 0.6));
  box-shadow: var(--glow-idle);
}

.page-about .lg-dot {
  width: 12px;
  height: 12px;
  margin-top: 5px;
  border-radius: 50%;
  background-color: var(--bg-900);
}

.page-about .lg-dot--in {
  box-shadow: 0 0 0 1.4px var(--cyan), inset 0 0 0 3px rgba(53, 224, 216, 0.55);
}

.page-about .lg-dot--mid {
  box-shadow: 0 0 0 1.4px rgba(53, 224, 216, 0.5), inset 0 0 0 3px rgba(53, 224, 216, 0.2);
}

.page-about .lg-dot--out {
  box-shadow: 0 0 0 1.4px rgba(140, 150, 196, 0.7);
}

.page-about .source-legend strong {
  display: block;
  margin-bottom: 7px;
  font-size: 0.99rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .source-legend p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.82;
  color: var(--slate);
}

.page-about .source-note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 0.92rem;
  line-height: 1.88;
  color: var(--slate);
}

.page-about .source-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 216, 0.4);
  transition: border-color 180ms var(--ease);
}

.page-about .source-note a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 合作 ---------- */
.page-about .partner-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4.6vw, 56px);
  align-items: start;
}

.page-about .partner-copy h2 {
  margin: 10px 0 18px;
  max-width: 20ch;
  font-size: clamp(1.6rem, 4.2vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: -0.022em;
  font-weight: 900;
  color: var(--white);
}

.page-about .partner-copy > p {
  margin: 0 0 clamp(22px, 3.2vw, 30px);
  font-size: 0.97rem;
  line-height: 1.9;
  color: var(--slate);
}

.page-about .partner-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .partner-figure {
  margin: 0 0 clamp(18px, 2.6vw, 24px);
}

.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .partner-list li {
  padding: clamp(16px, 2.4vw, 20px) clamp(16px, 2.4vw, 22px);
  border-left: 2px solid rgba(53, 224, 216, 0.34);
  border-radius: var(--radius-sm);
  background-image: linear-gradient(140deg, rgba(20, 27, 71, 0.82), rgba(11, 16, 48, 0.58));
  transition: border-left-color 220ms var(--ease), background-image 220ms var(--ease);
}

.page-about .partner-list li:hover {
  border-left-color: var(--cyan);
}

.page-about .partner-list strong {
  display: block;
  margin-bottom: 7px;
  font-size: 0.99rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .partner-list p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .stat-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .tl-layout {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }

  .page-about .tl-rail {
    display: block;
    position: sticky;
    top: 112px;
    align-self: start;
    padding-left: 26px;
  }

  .page-about .tl-rail::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background-image: linear-gradient(180deg, var(--cyan) 0%, rgba(53, 224, 216, 0.28) 48%, rgba(53, 224, 216, 0) 100%);
  }

  .page-about .tl-year {
    position: relative;
    display: block;
    padding: 15px 0;
    font-family: var(--font-mono);
    font-size: 0.94rem;
    letter-spacing: -0.01em;
    color: var(--slate);
  }

  .page-about .tl-year::before {
    content: "";
    position: absolute;
    left: -26px;
    top: 50%;
    width: 10px;
    height: 10px;
    margin-top: -5px;
    border-radius: 50%;
    background-color: var(--bg-900);
    box-shadow: 0 0 0 1.2px rgba(53, 224, 216, 0.7);
  }

  .page-about .tl-item:nth-child(odd) {
    margin-right: clamp(14px, 3.6vw, 52px);
  }

  .page-about .tl-item:nth-child(even) {
    margin-left: clamp(14px, 3.6vw, 52px);
  }

  .page-about .team-split {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: clamp(30px, 4.4vw, 60px);
  }

  .page-about .source-split {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
  }

  .page-about .partner-split {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  }
}

@media (min-width: 1100px) {
  .page-about .team-split {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
  }

  .page-about .about-hero h1 {
    max-width: 17ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .tl-toggle::after,
  .page-about .breadcrumb a,
  .page-about .team-link a,
  .page-about .source-note a,
  .page-about .partner-list li {
    transition: none;
  }
}
<<<END>>>