.page-about {
  --ab-rule: rgba(201, 162, 39, 0.26);
  --ab-rule-paper: rgba(16, 22, 20, 0.14);
  --ab-sec-pad: clamp(56px, 8.5vw, 116px);
  display: block;
  overflow-x: hidden;
  background: var(--ink-deep);
}

.page-about h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(24px, 3.1vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about h3 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.45;
}

.page-about .ab-lead {
  margin: 18px 0 0;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.8;
  max-width: 44em;
}

.about-section--paper .ab-lead,
.about-section--paper .ab-bi__note {
  color: #3b4741;
}

.about-section--deep .ab-lead {
  color: rgba(244, 239, 227, 0.84);
}

/* ---------- 回纹装饰带 ---------- */
.page-about .ab-band {
  display: block;
  margin: 0 0 22px;
  color: var(--gold);
  opacity: 0.55;
}

.page-about .ab-band svg {
  display: block;
  width: min(100%, 720px);
  height: 12px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-intro {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(48px, 7vw, 96px);
  background:
    radial-gradient(130% 100% at 88% -10%, rgba(30, 91, 74, 0.62), transparent 62%),
    radial-gradient(70% 60% at 4% 100%, rgba(242, 118, 46, 0.12), transparent 70%),
    var(--ink-deep);
  color: var(--paper);
  overflow: hidden;
}

.page-about .ab-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(201, 162, 39, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(201, 162, 39, 0.07) 1px, transparent 1px);
  background-size: 88px 88px;
  pointer-events: none;
}

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

.page-about .ab-intro__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 64px);
  margin-top: clamp(26px, 3.5vw, 44px);
}

.page-about .ab-intro h1 {
  margin: 16px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(32px, 5.6vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .ab-intro__lead {
  margin: 22px 0 0;
  font-size: clamp(16px, 1.55vw, 19px);
  line-height: 1.8;
  color: rgba(244, 239, 227, 0.92);
  max-width: 40em;
}

.page-about .ab-intro__sub {
  margin: 16px 0 0;
  font-size: clamp(14px, 1.25vw, 15.5px);
  line-height: 1.8;
  color: var(--moss-gray);
  max-width: 44em;
}

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

.page-about .ab-intro__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(201, 162, 39, 0.3);
  border: 1px solid rgba(201, 162, 39, 0.3);
  align-self: start;
}

.page-about .ab-fact {
  background: var(--ink-panel);
  padding: 20px 16px 22px;
}

.page-about .ab-fact__value {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 5px;
}

.page-about .ab-fact__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 3.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold-bright);
}

.page-about .ab-fact__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .ab-fact__label {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--moss-gray);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  position: relative;
  padding: var(--ab-sec-pad) 0;
}

.page-about .about-section--paper {
  background: var(--paper);
  color: var(--ink);
  --ab-rule: var(--ab-rule-paper);
}

.page-about .about-section--deep {
  background: var(--ink-deep);
  color: var(--paper);
  --ab-rule: rgba(201, 162, 39, 0.26);
}

.page-about .track {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.6vw, 34px);
}

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

.page-about .track__head .index-badge {
  position: static;
  display: inline-block;
  transform: none;
}

/* ---------- 我们每天在做什么 ---------- */
.page-about .ab-do {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: clamp(30px, 4vw, 46px);
}

.page-about .ab-do__item {
  border-top: 2px solid var(--gold);
  padding-top: 20px;
}

.page-about .ab-do__item h3 {
  color: var(--ink);
}

.page-about .ab-do__item p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: #3b4741;
}

.page-about .ab-do__foot {
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--ab-rule);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: var(--gold-dark);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(30px, 4vw, 46px);
}

.page-about .ab-team__col {
  position: relative;
  background: linear-gradient(155deg, rgba(30, 91, 74, 0.46), rgba(18, 58, 46, 0.94));
  border: 1px solid var(--ab-rule);
  border-top: 2px solid var(--gold);
  padding: 22px 18px 26px;
  box-shadow: 0 20px 42px -30px rgba(0, 0, 0, 0.9);
}

.page-about .ab-team__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin-bottom: 12px;
}

.page-about .ab-team__col h3 {
  color: var(--paper);
}

.page-about .ab-team__col p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(244, 239, 227, 0.8);
}

/* ---------- 流程步骤条 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-step {
  padding: 22px 20px 26px;
  background: linear-gradient(158deg, rgba(30, 91, 74, 0.5), rgba(18, 58, 46, 0.92));
  border: 1px solid rgba(201, 162, 39, 0.28);
  border-left: 3px solid var(--gold);
}

.page-about .ab-step__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 12px;
}

.page-about .ab-step h3 {
  color: var(--paper);
}

.page-about .ab-step p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(244, 239, 227, 0.8);
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: clamp(30px, 4.5vw, 56px) 0 0;
}

.page-about .ab-figure .figure__frame {
  border: 1px solid rgba(201, 162, 39, 0.28);
}

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

.page-about .about-section--paper .ab-figure .figure__frame {
  border-color: var(--ab-rule-paper);
}

/* ---------- 版本时间轴 ---------- */
.page-about .ver-timeline {
  position: relative;
  list-style: none;
  margin: clamp(34px, 4.5vw, 56px) 0 0;
  padding: 0;
}

.page-about .ver-timeline::before {
  content: "";
  position: absolute;
  left: 11.5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(to bottom,
      rgba(201, 162, 39, 0.6) 0,
      rgba(201, 162, 39, 0.32) 55%,
      rgba(201, 162, 39, 0.08) 100%);
}

.page-about .ver-node {
  position: relative;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  column-gap: 18px;
  padding-bottom: clamp(30px, 4vw, 46px);
}

.page-about .ver-node:last-child {
  padding-bottom: 0;
}

.page-about .ver-node__dot {
  grid-column: 1;
  grid-row: 1;
  justify-self: center;
  align-self: start;
  width: 12px;
  height: 12px;
  margin-top: 9px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 2px solid var(--gold);
  transition: background 0.24s var(--ease), box-shadow 0.24s var(--ease);
  z-index: 1;
}

.page-about .ver-node__card {
  grid-column: 2;
  grid-row: 1;
  justify-self: start;
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 13px 8px;
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  box-shadow: 0 1px 0 rgba(216, 207, 187, 0.9), 0 6px 14px -10px rgba(0, 0, 0, 0.6);
}

.page-about .ver-node__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold-dark);
}

.page-about .ver-node__season {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--moss-gray);
}

.page-about .ver-node__body {
  grid-column: 2;
  grid-row: 2;
  margin-top: 14px;
}

.page-about .ver-node__body h3 {
  color: var(--paper);
}

.page-about .ver-node__body p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(244, 239, 227, 0.8);
  max-width: 40em;
}

.page-about .ver-node:hover .ver-node__dot,
.page-about .ver-node:focus-within .ver-node__dot {
  background: var(--gold);
  box-shadow: 0 0 0 6px rgba(201, 162, 39, 0.16);
}

/* ---------- 双语 ---------- */
.page-about .ab-bi {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(28px, 3.6vw, 42px);
}

.page-about .ab-bi__col {
  border: 1px solid var(--paper-edge);
  background: #faf7ee;
  padding: 20px 18px 22px;
  box-shadow: 0 2px 0 rgba(216, 207, 187, 0.8), 0 12px 22px -20px rgba(16, 22, 20, 0.5);
}

.page-about .ab-bi__lang {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold-dark);
}

.page-about .ab-bi__desc {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #3b4741;
}

.page-about .ab-bi__note {
  margin: 22px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  max-width: 46em;
}

.page-about .ab-bi__note--deep {
  color: rgba(244, 239, 227, 0.8);
}

/* ---------- 合作与收束 ---------- */
.page-about .ab-partners .ab-bi__note--deep {
  margin-top: 20px;
}

.page-about .ab-partners__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .ab-do {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

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

  .page-about .ab-bi {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px;
    background: var(--paper-edge);
    border: 1px solid var(--paper-edge);
  }

  .page-about .ab-bi__col {
    border: none;
    box-shadow: none;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .track {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
    align-items: stretch;
  }

  .page-about .track__head {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    border-right: 1px solid var(--ab-rule);
    padding-right: clamp(18px, 2.2vw, 30px);
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .ab-step {
    clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 100%, 0 100%);
    padding-right: 30px;
  }

  .page-about .ver-timeline::before {
    left: 47.5px;
  }

  .page-about .ver-node {
    grid-template-columns: 96px minmax(0, 1fr);
    column-gap: 26px;
    align-items: start;
  }

  .page-about .ver-node__dot {
    grid-column: 1;
    grid-row: 1 / span 2;
    justify-self: center;
    margin-top: 12px;
  }

  .page-about .ver-node__card {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .ver-node__body {
    grid-column: 2;
    grid-row: 2;
    margin-top: 16px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-intro__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(300px, 0.85fr);
    align-items: start;
  }

  .page-about .ab-intro__facts {
    margin-top: 46px;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    max-width: 1180px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ver-node__dot {
    transition: none;
  }
}
<<<END>>>