.page-about {
  background: var(--ink-800);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(48px, 8vw, 104px) 0 clamp(52px, 8vw, 92px);
  background:
    radial-gradient(120% 80% at 84% 0%, rgba(212, 175, 55, .13), transparent 62%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(124, 138, 145, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 138, 145, .07) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 76%);
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .hero-main h1 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(34px, 6.2vw, 76px);
  line-height: 1.07;
  letter-spacing: -.02em;
  margin: 14px 0 0;
}

.page-about .hero-lede {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(242, 237, 227, .82);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .hero-facts {
  border-top: 1px solid rgba(212, 175, 55, .55);
  padding-top: 20px;
  align-self: end;
}

.page-about .facts-title {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--rock);
}

.page-about .fact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .fact {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .fact-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.2;
  color: var(--gold);
  letter-spacing: -.01em;
  white-space: nowrap;
}

.page-about .fact-label {
  font-size: 13.5px;
  line-height: 1.5;
  color: rgba(242, 237, 227, .7);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: clamp(52px, 8vw, 104px) 0;
}

.page-about .about-section--tint {
  background: var(--ink-700);
}

.page-about .about-section--deep {
  background: var(--ink-900);
}

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

.page-about .rail-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .2em;
  color: var(--gold);
  padding: 4px 12px;
  border: 1px solid rgba(212, 175, 55, .42);
  border-radius: var(--r-pill);
}

.page-about .rail-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(25px, 3.2vw, 36px);
  line-height: 1.24;
  letter-spacing: -.01em;
  margin: 16px 0 0;
}

.page-about .rail-tag {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--rock);
}

.page-about .about-body > p {
  max-width: 68ch;
  margin: 0 0 1.05em;
  font-size: 15.5px;
  line-height: 1.88;
  color: rgba(242, 237, 227, .84);
}

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

.page-about .lead-line {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 25px);
  line-height: 1.6;
  color: var(--paper);
  max-width: 26ch;
}

.page-about .pull-quote {
  margin: 30px 0;
  padding: 22px 24px;
  max-width: 66ch;
  border-left: 3px solid var(--jade);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(95, 167, 156, .09);
  font-size: 15.5px;
  line-height: 1.88;
  color: rgba(242, 237, 227, .9);
}

/* ---------- 阶段 ---------- */
.page-about .stage-track {
  display: grid;
  gap: 14px;
  margin-top: 30px;
  align-items: start;
}

.page-about .stage {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(6, 16, 26, .55);
  overflow: hidden;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .stage[open] {
  border-color: rgba(212, 175, 55, .45);
  background: rgba(6, 16, 26, .82);
}

.page-about .stage summary {
  position: relative;
  display: grid;
  gap: 7px;
  padding: 20px 20px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .stage summary::after {
  content: "+";
  position: absolute;
  top: 18px;
  right: 18px;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--jade);
  transition: color .3s var(--ease);
}

.page-about .stage[open] summary::after {
  content: "–";
  color: var(--gold);
}

.page-about .stage-sum-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .stage-sum-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
}

.page-about .stage-sum-hint {
  font-size: 13px;
  line-height: 1.6;
  color: var(--rock);
  padding-right: 28px;
}

.page-about .stage-body {
  padding: 16px 20px 22px;
  border-top: 1px solid var(--line);
}

.page-about .stage-body ul {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 237, 227, .8);
}

.page-about .stage-body li::marker {
  color: var(--gold);
}

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

.page-about .figure .figure-media {
  border-radius: var(--r-lg);
  overflow: hidden;
}

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

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.page-about .team-card {
  display: grid;
  gap: 11px;
  align-content: start;
  padding: 22px;
  border-radius: var(--r-lg);
  background: rgba(6, 16, 26, .5);
  border-top: 3px solid var(--moss);
}

.page-about .team-card:nth-child(2) {
  border-top-color: var(--jade);
}

.page-about .team-card:nth-child(3) {
  border-top-color: var(--clay);
}

.page-about .team-card:nth-child(4) {
  border-top-color: var(--cinnabar);
}

.page-about .team-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .team-name {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
}

.page-about .team-count {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .team-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 237, 227, .82);
}

.page-about .team-card ul {
  margin: 0;
  padding-left: 16px;
  display: grid;
  gap: 7px;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(242, 237, 227, .7);
}

.page-about .team-card li::marker {
  color: var(--jade);
}

/* ---------- 审核流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .flow-step {
  position: relative;
  padding: 0 0 32px 54px;
}

.page-about .flow-step:last-child {
  padding-bottom: 0;
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 42px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, rgba(212, 175, 55, .7), rgba(95, 167, 156, .5));
}

.page-about .flow-step:last-child::before {
  display: none;
}

.page-about .flow-index {
  position: absolute;
  left: 0;
  top: 0;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-900);
  background: var(--gold);
  transition: transform .3s var(--ease), background .3s var(--ease);
}

.page-about .flow-step:hover .flow-index,
.page-about .flow-step:focus-within .flow-index {
  transform: scale(1.1);
  background: var(--jade);
}

.page-about .flow-title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .flow-step p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(242, 237, 227, .82);
}

.page-about .rhythm-list {
  margin: 34px 0 0;
  padding: 22px;
  display: grid;
  gap: 0;
  border-radius: var(--r-md);
  background: rgba(6, 16, 26, .6);
  border: 1px solid var(--line);
}

.page-about .rhythm-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}

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

.page-about .rhythm-item:first-child {
  padding-top: 0;
}

.page-about .rhythm-item dt {
  font-size: 14px;
  color: rgba(242, 237, 227, .75);
}

.page-about .rhythm-item dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13.5px;
  color: var(--jade);
  text-align: right;
}

/* ---------- 用户结构 ---------- */
.page-about .ratio-block {
  margin-top: 30px;
  padding: 24px;
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, rgba(19, 44, 66, .95), rgba(6, 16, 26, .8));
  border: 1px solid var(--line-strong);
}

.page-about .ratio-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.page-about .ratio-label {
  font-size: 13.5px;
  line-height: 1.6;
  letter-spacing: .03em;
  color: rgba(242, 237, 227, .8);
}

.page-about .ratio-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  color: var(--gold);
}

.page-about .ratio-bar {
  height: 12px;
  border-radius: var(--r-pill);
  background: rgba(124, 138, 145, .22);
  overflow: hidden;
}

.page-about .ratio-fill {
  display: block;
  height: 100%;
  width: 62%;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--gold-deep), var(--gold));
}

.page-about .ratio-note {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: rgba(242, 237, 227, .72);
}

.page-about .scene-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .scene {
  padding: 20px 22px;
  border-radius: var(--r-md);
  background: rgba(95, 167, 156, .08);
  border-left: 2px solid var(--jade);
}

.page-about .scene h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .scene p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 237, 227, .78);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .partner {
  padding: 24px;
  border-radius: var(--r-lg);
  background: rgba(19, 44, 66, .72);
  border: 1px solid var(--line);
}

.page-about .partner h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .partner p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(242, 237, 227, .8);
}

.page-about .uptime {
  margin: 22px 0 0;
  padding: 16px 22px;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  border-radius: var(--r-pill);
  background: rgba(212, 175, 55, .1);
  border: 1px solid rgba(212, 175, 55, .32);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(242, 237, 227, .85);
}

.page-about .uptime .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  color: var(--gold);
}

/* ---------- 反馈 ---------- */
.page-about .channel-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .channel-list li {
  padding-left: 18px;
  border-left: 2px solid var(--clay);
}

.page-about .channel-list h3 {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-size: 15.5px;
  font-weight: 700;
}

.page-about .channel-list p {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 237, 227, .78);
}

.page-about .contact-block {
  margin-top: 30px;
  padding: 22px;
  display: grid;
  gap: 14px;
  border-radius: var(--r-lg);
  background: rgba(6, 16, 26, .62);
  border: 1px solid var(--line-strong);
}

.page-about .contact-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 12px;
}

.page-about .contact-key {
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--rock);
}

.page-about .contact-val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14.5px;
  color: var(--paper);
  word-break: break-all;
}

.page-about .contact-note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(242, 237, 227, .66);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 760px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .rhythm-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-about .rhythm-item:nth-child(2) {
    border-bottom: 1px dashed var(--line);
  }
}

@media (min-width: 820px) {
  .page-about .stage-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .team-card--wide {
    grid-column: span 2;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }
}

@media (min-width: 960px) {
  .page-about .about-row {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 118px;
  }

  .page-about .about-body > p,
  .page-about .about-body > .pull-quote {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage summary::after,
  .page-about .flow-index {
    transition: none;
  }

  .page-about .flow-step:hover .flow-index {
    transform: none;
  }
}
<<<END>>>