.page-about {
  background: var(--stone);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding: clamp(16px, 3vw, 28px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--warm);
}
.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .breadcrumbs li {
  display: inline-flex;
  align-items: center;
}
.page-about .breadcrumbs li::after {
  content: "/";
  margin-left: 6px;
  color: var(--gold);
}
.page-about .breadcrumbs li:last-child::after {
  content: none;
}
.page-about .breadcrumbs a {
  color: var(--sea);
  text-decoration: none;
}
.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(40px, 6vw, 88px);
  background: linear-gradient(180deg, var(--stone) 0%, var(--stone) 58%, rgba(232, 201, 122, .42) 100%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -18%;
  width: min(64vw, 660px);
  aspect-ratio: 1;
  background: radial-gradient(circle at 34% 34%, rgba(232, 201, 122, .6), rgba(232, 201, 122, 0) 68%);
  pointer-events: none;
}
.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: end;
}
.page-about .about-hero__lead {
  min-width: 0;
}
.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.022em;
  margin: 12px 0 0;
  color: var(--deep);
  text-wrap: balance;
}
.page-about .about-hero__intro {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--ink);
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  background: rgba(23, 63, 58, .16);
  border: 1px solid rgba(23, 63, 58, .16);
}
.page-about .about-hero__stats li {
  background: var(--paper);
  padding: 16px 14px;
  min-width: 0;
}
.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--deep);
}
.page-about .about-stat__cap {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  color: var(--warm);
  line-height: 1.4;
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  min-width: 0;
}
.page-about .about-hero__figure .figure__media {
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: linear-gradient(150deg, var(--gold), var(--celadon));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-hero__figure .figure__cap {
  padding: 12px 16px;
  background: var(--deep);
  color: var(--stone);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
}

/* ---------- 章节通用 ---------- */
.page-about .chapter {
  position: relative;
  padding: clamp(42px, 7vw, 96px) 0;
}
.page-about .chapter--paper { background: var(--paper); }
.page-about .chapter--stone { background: var(--stone); }
.page-about .chapter--deep {
  background: var(--deep);
  color: var(--stone);
}
.page-about .chapter--gold {
  background: linear-gradient(180deg, #F4E5C4 0%, var(--stone) 100%);
}
.page-about .chapter__grid {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  align-items: start;
}
.page-about .chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-top: 3px solid var(--celadon);
  padding-top: 10px;
}
.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 62px);
  font-weight: 700;
  line-height: .84;
  letter-spacing: -0.045em;
  color: var(--celadon);
}
.page-about .chapter__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--warm);
}
.page-about .chapter__body {
  min-width: 0;
}
.page-about .chapter h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.6vw, 40px);
  line-height: 1.24;
  letter-spacing: -0.015em;
  margin: 0 0 clamp(14px, 2vw, 22px);
  color: var(--deep);
  text-wrap: balance;
}
.page-about .chapter h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.42;
  margin: 0 0 8px;
  color: var(--deep);
}
.page-about .chapter p {
  font-size: 16px;
  line-height: 1.86;
  margin: 0 0 1em;
  color: var(--ink);
}
.page-about .chapter p:last-child {
  margin-bottom: 0;
}

.page-about .chapter--deep .chapter__rail { border-top-color: var(--gold); }
.page-about .chapter--deep .chapter__num { color: var(--gold); }
.page-about .chapter--deep .chapter__kicker { color: rgba(247, 239, 216, .62); }
.page-about .chapter--deep h2 { color: var(--paper); }
.page-about .chapter--deep > .wrap > .chapter__body > p { color: rgba(247, 239, 216, .88); }

/* ---------- 引语面板 ---------- */
.page-about .about-pullquote {
  margin: clamp(18px, 3vw, 28px) 0;
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.6vw, 28px);
  border-left: 5px solid var(--brick);
  background: var(--stone);
}
.page-about .about-pullquote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.62;
  color: var(--deep);
}

/* ---------- 四步法 ---------- */
.page-about .step-list {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(23, 63, 58, .18);
  border-top: 1px solid rgba(23, 63, 58, .18);
  border-bottom: 1px solid rgba(23, 63, 58, .18);
}
.page-about .step-item {
  background: var(--paper);
  padding: clamp(16px, 2.4vw, 24px);
  min-width: 0;
}
.page-about .step-item__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--paper);
  background: var(--celadon);
  padding: 3px 9px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%);
}
.page-about .step-item h3 {
  margin-top: 12px;
  font-size: clamp(18px, 2vw, 21px);
}
.page-about .step-item p {
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
  color: var(--ink);
}

.page-about .about-step-figure {
  margin: clamp(24px, 3.6vw, 36px) 0 0;
}
.page-about .about-step-figure .figure__media {
  aspect-ratio: 14 / 9;
  overflow: hidden;
  background: linear-gradient(140deg, var(--celadon), var(--gold));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}
.page-about .about-step-figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-step-figure .figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--warm);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(12px, 2vw, 18px);
  margin-top: clamp(22px, 3vw, 32px);
}
.page-about .team-card {
  position: relative;
  min-width: 0;
  padding: clamp(18px, 2.4vw, 26px);
  background: rgba(247, 239, 216, .07);
  border: 1px solid rgba(232, 201, 122, .32);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: background .22s var(--ease), border-color .22s var(--ease);
}
.page-about .team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 46%;
  background: var(--c, var(--gold));
}
.page-about .team-card:hover,
.page-about .team-card:focus-within,
.page-about .team-card:focus {
  background: rgba(247, 239, 216, .14);
  border-color: var(--gold);
  outline: none;
}
.page-about .team-card__count {
  display: block;
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 700;
  line-height: 1;
  color: var(--c, var(--gold));
}
.page-about .team-card h3 {
  margin: 12px 0 8px;
  color: var(--paper);
  font-size: 18px;
}
.page-about .team-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(247, 239, 216, .82);
}
.page-about .team-card__tag {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: rgba(247, 239, 216, .62);
  border-bottom: 1px solid rgba(232, 201, 122, .45);
  padding-bottom: 3px;
}
.page-about .team-card:nth-child(1) { --c: var(--gold); }
.page-about .team-card:nth-child(2) { --c: #6FA9C9; }
.page-about .team-card:nth-child(3) { --c: #C4796A; }
.page-about .team-card:nth-child(4) { --c: #7FBFA8; }

/* ---------- 阶段轴 ---------- */
.page-about .stage-list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: clamp(10px, 1.6vw, 16px);
}
.page-about .stage-list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--celadon) 55%, var(--sea) 100%);
}
.page-about .stage {
  position: relative;
  min-width: 0;
}
.page-about .stage::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 17px;
  width: 9px;
  height: 9px;
  background: var(--paper);
  border: 3px solid var(--celadon);
  border-radius: 50%;
}
.page-about .stage__node {
  background: var(--paper);
  border: 1px solid rgba(23, 63, 58, .14);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}
.page-about .stage__node[open] {
  border-color: rgba(143, 59, 46, .45);
}
.page-about .stage__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
}
.page-about .stage__summary::-webkit-details-marker { display: none; }
.page-about .stage__summary::marker { content: ""; }
.page-about .stage__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--paper);
  background: var(--celadon);
  padding: 3px 9px;
  flex: none;
}
.page-about .stage__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--deep);
}
.page-about .stage__toggle {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--sea);
  transition: color .2s var(--ease);
}
.page-about .stage__node[open] .stage__toggle { color: var(--brick); }
.page-about .stage__panel {
  padding: 12px 18px 18px;
  border-top: 1px dashed rgba(23, 63, 58, .2);
}
.page-about .stage__panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 合作生态 ---------- */
.page-about .partner-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(18px, 3vw, 28px) 0;
}
.page-about .partner-dots span {
  width: clamp(22px, 4vw, 30px);
  aspect-ratio: 1;
  background: var(--gold);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}
.page-about .partner-dots span:nth-child(3n) { background: var(--celadon); }
.page-about .partner-dots span:nth-child(4n) { background: var(--brick); opacity: .82; }
.page-about .partner-facts {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .partner-facts li {
  border-left: 3px solid var(--gold);
  padding: 3px 0 3px 14px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink);
  min-width: 0;
}
.page-about .partner-facts strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 23px;
  font-weight: 700;
  color: var(--deep);
  line-height: 1.2;
  margin-bottom: 2px;
}
.page-about .about-partner-figure {
  margin: 0;
}
.page-about .about-partner-figure .figure__media {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: linear-gradient(130deg, var(--gold), var(--celadon));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}
.page-about .about-partner-figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-partner-figure .figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--warm);
}

/* ---------- 服务标准 ---------- */
.page-about .pledge {
  display: grid;
  gap: 1px;
  margin: clamp(20px, 3vw, 30px) 0;
  background: rgba(23, 63, 58, .16);
  border: 1px solid rgba(23, 63, 58, .16);
}
.page-about .pledge__row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  align-items: baseline;
  background: var(--paper);
  padding: 15px 18px;
  min-width: 0;
}
.page-about .pledge dt {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--brick);
}
.page-about .pledge dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  min-width: 0;
}

.page-about .about-base {
  margin-top: clamp(18px, 3vw, 28px);
  padding: clamp(20px, 3vw, 32px);
}
.page-about .about-base h3 {
  margin: 0 0 16px;
  color: var(--paper);
}
.page-about .about-base__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-base__list li {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
  word-break: break-word;
}
.page-about .about-base__key {
  display: inline-block;
  min-width: 5.4em;
  margin-right: 10px;
  color: var(--gold);
  letter-spacing: .06em;
}
.page-about .about-base__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed rgba(232, 201, 122, .4);
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(247, 239, 216, .78);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background: var(--deep);
  color: var(--stone);
  padding: clamp(40px, 6vw, 76px) 0 clamp(48px, 7vw, 90px);
  border-top: 6px solid var(--gold);
}
.page-about .about-next h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.26;
  margin: 0 0 10px;
  color: var(--paper);
}
.page-about .about-next > .wrap > p {
  margin: 0 0 clamp(22px, 3vw, 32px);
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(247, 239, 216, .8);
  max-width: 40em;
}
.page-about .about-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-next__links a {
  display: block;
  padding: 16px 18px;
  background: rgba(247, 239, 216, .06);
  border-left: 4px solid var(--gold);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  text-decoration: none;
  transition: background .22s var(--ease), border-color .22s var(--ease);
}
.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  background: rgba(247, 239, 216, .14);
  border-left-color: var(--brick);
  outline: none;
}
.page-about .about-next__label {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper);
  margin-bottom: 4px;
}
.page-about .about-next__desc {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(247, 239, 216, .74);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .step-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .partner-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .about-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .pledge {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
  }
  .page-about .about-hero__figure::before {
    content: "";
    position: absolute;
    inset: -16px -16px 16px 16px;
    background: var(--gold);
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
  }
  .page-about .about-hero__figure > * {
    position: relative;
  }
}

@media (min-width: 860px) {
  .page-about .chapter__grid {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
  }
  .page-about .chapter__rail {
    position: sticky;
    top: 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding-top: 14px;
    border-top-width: 4px;
  }
  .page-about .chapter__body {
    max-width: 62ch;
  }
  .page-about .chapter--wide .chapter__body {
    max-width: none;
  }
}

@media (min-width: 1080px) {
  .page-about .step-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-next__links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .pledge {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .stage__toggle,
  .page-about .about-next__links a {
    transition: none;
  }
}
<<<END>>>