.page-about {
  --about-section-gap: clamp(2.75rem, 6vw, 5rem);
  position: relative;
  padding-bottom: clamp(3rem, 8vw, 6rem);
  color: var(--paper);
  background:
    radial-gradient(130% 70% at 86% -8%, rgba(61, 242, 208, 0.10), transparent 58%),
    radial-gradient(90% 60% at 4% 32%, rgba(43, 37, 84, 0.55), transparent 62%),
    linear-gradient(180deg, #041e1a 0%, var(--ink-900) 46%, #041c18 100%);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(0.5rem, 2vw, 1.5rem);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}

.page-about .hero-copy h1 {
  margin: 0.5rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.95rem, 5.6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .hero-lead {
  margin: 0 0 0.9rem;
  max-width: 34em;
  font-size: clamp(1rem, 2.1vw, 1.12rem);
  line-height: 1.8;
  color: rgba(234, 247, 243, 0.9);
}

.page-about .hero-sub {
  margin: 0 0 1.6rem;
  max-width: 34em;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .hero-actions,
.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.page-about .hero-visual {
  margin: 0;
  position: relative;
}

.page-about .hero-visual::before {
  content: "";
  position: absolute;
  inset: -10% -6% auto auto;
  width: 46%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(242, 184, 75, 0.22), transparent 68%);
  filter: blur(6px);
  pointer-events: none;
}

.page-about .media-frame {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-panel);
  background: var(--ink-800);
}

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

.page-about .hero-cap {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .hero-stats {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.9rem 1rem;
  background: rgba(11, 58, 50, 0.92);
}

.page-about .hero-stats .data-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.6vw, 1.6rem);
  letter-spacing: -0.02em;
  color: var(--cyan-500);
}

.page-about .stat-label {
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--mist);
}

/* ---------- 侧轨 + 正文流 ---------- */
.page-about .about-shell {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
  margin-top: var(--about-section-gap);
}

.page-about .rail-kicker {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .rail-words {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.page-about .rail-word {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.45rem 0.75rem;
  font-size: 0.84rem;
  color: var(--cyan-100);
  background: rgba(11, 58, 50, 0.65);
  border: 1px solid var(--line);
  border-radius: 999px;
}

.page-about .rw-i {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--amber-400);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  margin-bottom: var(--about-section-gap);
}

.page-about .about-section h2,
.page-about .about-cta h2 {
  margin: 0.35rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.55rem, 4.2vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .section-lead {
  margin: 0 0 1.6rem;
  max-width: 60ch;
  font-size: 1.01rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 起点与当下 ---------- */
.page-about .origin-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .origin-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1.15rem 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .origin-num {
  display: grid;
  place-items: center;
  width: 1.9rem;
  height: 1.9rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--ink-900);
  background: var(--cyan-500);
  border-radius: 8px;
}

.page-about .origin-item h3 {
  margin: 0 0 0.35rem;
  font-size: 1.03rem;
  letter-spacing: -0.01em;
  color: var(--cyan-100);
}

.page-about .origin-item p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(141, 184, 174, 0.98);
}

/* ---------- 三阶段 ---------- */
.page-about .stage-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .stage-item {
  padding: clamp(1.1rem, 3vw, 1.75rem);
  border: 1px solid var(--line);
  border-radius: 32px 10px 32px 10px;
  box-shadow: var(--shadow-panel);
}

.page-about .stage-item--a {
  background: linear-gradient(135deg, rgba(110, 31, 59, 0.92), rgba(110, 31, 59, 0.5));
}

.page-about .stage-item--b {
  background: linear-gradient(135deg, rgba(43, 37, 84, 0.95), rgba(14, 75, 68, 0.78));
}

.page-about .stage-item--c {
  background: linear-gradient(135deg, rgba(14, 75, 68, 0.95), rgba(11, 58, 50, 0.9));
}

.page-about .stage-num {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--amber-400);
}

.page-about .stage-item h3 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.06rem, 2.4vw, 1.28rem);
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .stage-item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: rgba(234, 247, 243, 0.86);
}

.page-about .stage-points {
  list-style: none;
  margin: 0.9rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.page-about .stage-points li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.86rem;
  line-height: 1.7;
  color: rgba(159, 247, 231, 0.92);
}

.page-about .stage-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--cyan-500);
}

.page-about .about-figure {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
}

.page-about .about-figure figcaption {
  margin-top: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 服务对象 ---------- */
.page-about .who-grid {
  display: grid;
  gap: 0.9rem;
}

.page-about .who-card {
  padding: 1.2rem 1.1rem;
  background: rgba(11, 58, 50, 0.82);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.page-about .who-tag {
  display: inline-block;
  margin-bottom: 0.7rem;
  padding: 0.2rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.13em;
  color: var(--amber-400);
  border: 1px solid rgba(242, 184, 75, 0.42);
  border-radius: 999px;
}

.page-about .who-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.04rem;
  color: var(--paper);
}

.page-about .who-card p {
  margin: 0;
  font-size: 0.91rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 0.8rem;
}

.page-about .team-role {
  padding: 0.95rem 1.05rem;
  background: rgba(14, 75, 68, 0.55);
  border: 1px solid var(--line);
  border-left: 3px solid rgba(61, 242, 208, 0.5);
  border-radius: var(--radius-md);
}

.page-about .team-role[open] {
  border-left-color: var(--amber-400);
}

.page-about .team-role summary {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  cursor: pointer;
  list-style: none;
}

.page-about .team-role summary::-webkit-details-marker {
  display: none;
}

.page-about .team-role summary::after {
  content: "展开";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--cyan-500);
}

.page-about .team-role[open] summary::after {
  content: "收起";
}

.page-about .role-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .role-count {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--amber-400);
}

.page-about .role-body {
  margin: 0.75rem 0 0;
  font-size: 0.91rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 覆盖与节奏 ---------- */
.page-about .fact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .fact-cell {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.05rem 1rem;
  background: #0a352e;
}

.page-about .fact-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.6vw, 1.65rem);
  letter-spacing: -0.02em;
  color: var(--cyan-500);
}

.page-about .fact-label {
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .reach-note {
  margin: 1.2rem 0 0;
  padding: 1rem 1.1rem;
  font-size: 0.94rem;
  line-height: 1.85;
  color: rgba(234, 247, 243, 0.88);
  background: rgba(43, 37, 84, 0.42);
  border-left: 3px solid var(--cyan-500);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.page-about .inline-link {
  color: var(--cyan-100);
  text-decoration: underline;
  text-decoration-color: rgba(61, 242, 208, 0.5);
  text-underline-offset: 0.18em;
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--cyan-500);
  text-decoration-color: var(--cyan-500);
}

/* ---------- 长期坚持 ---------- */
.page-about .std-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .std-item {
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--amber-400);
}

.page-about .std-item h3 {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin: 0 0 0.35rem;
  font-size: 1rem;
  color: var(--cyan-100);
}

.page-about .std-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--amber-400);
}

.page-about .std-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: clamp(1.5rem, 4vw, 2.75rem);
  background: linear-gradient(120deg, rgba(110, 31, 59, 0.9), rgba(43, 37, 84, 0.92));
  border: 1px solid var(--line);
  border-radius: 40px 12px 40px 12px;
}

.page-about .cta-text {
  margin: 0 0 1.4rem;
  max-width: 52ch;
  font-size: 0.97rem;
  line-height: 1.85;
  color: rgba(234, 247, 243, 0.9);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }

  .page-about .fact-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .stage-item--a {
    width: 76%;
  }

  .page-about .stage-item--b {
    width: 88%;
    margin-left: auto;
    border-radius: 10px 32px 10px 32px;
  }

  .page-about .stage-item--c {
    width: 100%;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h) + 1.5rem);
    align-self: start;
  }

  .page-about .rail-words {
    flex-direction: column;
    gap: 0.55rem;
  }

  .page-about .rail-word {
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--amber-400);
  }
}

@media (min-width: 1180px) {
  .page-about .about-shell {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 3rem;
  }

  .page-about .origin-item {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 1.25rem;
    padding: 1.35rem 0;
  }
}
<<<END>>>