.page-about {
  --pad-x: clamp(20px, 4vw, 64px);
  --pad-y: clamp(48px, 8vw, 96px);
  --gap-lg: clamp(32px, 5vw, 64px);
  --hairline: rgba(201, 211, 230, 0.16);
  --hairline-strong: rgba(201, 211, 230, 0.28);
  --board: var(--brass-500);
  overflow-x: clip;
}

/* ========== 面包屑 ========== */
.page-about .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 40px);
}
.page-about .breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--silver-200);
}
.page-about .breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.page-about .breadcrumb li + li::before {
  content: "/";
  color: rgba(197, 139, 78, 0.7);
  font-family: var(--font-mono);
}
.page-about .breadcrumb a {
  color: var(--silver-200);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--brass-300);
  border-bottom-color: var(--brass-500);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--brass-300);
}

/* ========== 首屏 ========== */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-900);
  padding-block: clamp(24px, 4vw, 48px) clamp(56px, 9vw, 112px);
  color: var(--silver-200);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 82% 18%, rgba(197, 139, 78, 0.16), transparent 52%),
    radial-gradient(circle at 12% 92%, rgba(22, 217, 190, 0.07), transparent 46%),
    linear-gradient(178deg, var(--ink-900) 0%, var(--ink-800) 100%);
}
.page-about .about-hero__slash {
  position: absolute;
  top: -12%;
  right: -8%;
  width: 52%;
  height: 128%;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(
    132deg,
    transparent 46%,
    rgba(197, 139, 78, 0.09) 46.3%,
    rgba(197, 139, 78, 0.09) 47%,
    transparent 47.3%,
    transparent 54%,
    rgba(201, 211, 230, 0.05) 54.2%,
    rgba(201, 211, 230, 0.05) 54.8%,
    transparent 55%
  );
  transform: rotate(-8deg);
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
  grid-template-columns: 1fr;
}
.page-about .about-hero__copy .eyebrow {
  color: var(--brass-300);
}
.page-about .about-hero h1 {
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(34px, 5.4vw, 60px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--paper);
  margin: 14px 0 22px;
  max-width: 16ch;
}
.page-about .about-hero .lede {
  color: var(--silver-200);
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.78;
  max-width: 52ch;
  margin: 0 0 32px;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--hairline);
  background: var(--ink-800);
  align-self: start;
}
.page-about .stat {
  padding: clamp(18px, 2.4vw, 26px);
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .stat:nth-child(2n) { border-right: none; }
.page-about .stat:nth-last-child(-n+2) { border-bottom: none; }
.page-about .stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(26px, 3.2vw, 36px);
  line-height: 1;
  color: var(--brass-300);
  letter-spacing: -0.02em;
}
.page-about .stat-lbl {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--silver-200);
}

/* ========== 面板通用 ========== */
.page-about .panel {
  position: relative;
  padding-block: var(--pad-y);
  border-top: 1px solid var(--hairline);
}
.page-about .panel .wrap { max-width: 1240px; }
.page-about .panel-head { max-width: 62ch; margin-bottom: var(--gap-lg); }
.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--brass-500);
}
.page-about .eyebrow::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 1px;
  background: var(--brass-500);
}
.page-about .section-title {
  font-family: var(--font-cn);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.012em;
  margin: 0 0 16px;
}
.page-about .lede {
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.78;
  margin: 0;
  max-width: 60ch;
}

/* ========== 品牌起点 ========== */
.page-about .about-story {
  background: var(--ink-900);
  color: var(--silver-200);
}
.page-about .about-story .section-title { color: var(--paper); }
.page-about .about-story__grid {
  display: grid;
  gap: var(--gap-lg);
  grid-template-columns: 1fr;
  align-items: start;
}
.page-about .about-story__copy p {
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  margin: 0 0 18px;
  max-width: 56ch;
}
.page-about .about-story__copy p:last-child { margin-bottom: 0; }
.page-about .about-quote {
  position: relative;
  padding: clamp(24px, 3.4vw, 40px) 0 clamp(24px, 3.4vw, 40px) clamp(24px, 3.4vw, 40px);
  border-left: 2px solid var(--brass-500);
  margin: 0;
}
.page-about .about-quote p {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(20px, 2.6vw, 27px);
  line-height: 1.5;
  color: var(--paper);
  margin: 0;
  max-width: 26ch;
}
.page-about .about-story__figure {
  margin: clamp(32px, 5vw, 64px) 0 0;
}

/* ========== 团队 ========== */
.page-about .about-team {
  background: var(--silver-050);
  color: var(--ink-800);
}
.page-about .about-team .panel-head .lede { color: var(--ink-700); }
.page-about .about-team__grid {
  display: grid;
  gap: 1px;
  grid-template-columns: 1fr;
  background: rgba(16, 29, 68, 0.14);
  border: 1px solid rgba(16, 29, 68, 0.14);
}
.page-about .role {
  background: var(--paper);
  padding: clamp(22px, 3vw, 32px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background 0.24s var(--ease), transform 0.24s var(--ease);
}
.page-about .role:hover {
  background: #ffffff;
  transform: translateY(-2px);
}
.page-about .role__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--brass-500);
}
.page-about .role__name {
  font-family: var(--font-cn);
  font-weight: 800;
  font-size: clamp(18px, 2vw, 21px);
  margin: 0;
  color: var(--ink-900);
}
.page-about .role__count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(26px, 3vw, 32px);
  line-height: 1;
  color: var(--ink-800);
  margin: 0 0 4px;
}
.page-about .role__count span {
  font-family: var(--font-cn);
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-700);
  margin-left: 4px;
}
.page-about .role__desc {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-700);
  margin: 0;
}

/* ========== 街道板块 ========== */
.page-about .about-streets {
  background: var(--ink-800);
  color: var(--silver-200);
}
.page-about .about-streets .section-title { color: var(--paper); }
.page-about .about-streets__figure {
  margin: 0 0 var(--gap-lg);
}
.page-about .street-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}
.page-about .street {
  position: relative;
  background: var(--ink-800);
  padding: clamp(22px, 3vw, 32px);
  border-left: 3px solid var(--board);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background 0.24s var(--ease);
}
.page-about .street:hover,
.page-about .street:focus-within {
  background: var(--ink-700);
}
.page-about .street__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--board);
  line-height: 1;
}
.page-about .street__name {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(22px, 2.6vw, 28px);
  line-height: 1.2;
  margin: 0;
  color: var(--paper);
}
.page-about .street__desc {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver-200);
  margin: 0;
}
.page-about .street__link {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-top: 8px;
  font-family: var(--font-cn);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--board);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  transition: border-color 0.2s var(--ease), gap 0.2s var(--ease);
}
.page-about .street__link span {
  font-family: var(--font-mono);
  font-size: 15px;
  transition: transform 0.2s var(--ease);
}
.page-about .street__link:hover,
.page-about .street__link:focus-visible {
  border-bottom-color: var(--board);
}
.page-about .street__link:hover span { transform: translateX(3px); }

/* ========== 五步服务 ========== */
.page-about .about-process {
  background: var(--paper);
  color: var(--ink-800);
}
.page-about .about-process .panel-head .lede { color: var(--ink-700); }
.page-about .process {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid rgba(16, 29, 68, 0.18);
}
.page-about .process__step {
  position: relative;
  padding: clamp(24px, 3.4vw, 32px) 0;
  border-bottom: 1px solid rgba(16, 29, 68, 0.18);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.page-about .process__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--brass-500);
  border-radius: 50%;
  color: var(--brass-500);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.page-about .process__name {
  font-family: var(--font-cn);
  font-weight: 800;
  font-size: clamp(17px, 1.9vw, 20px);
  margin: 4px 0 0;
  color: var(--ink-900);
}
.page-about .process__desc {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-700);
  margin: 0;
  max-width: 30ch;
}

/* ========== 里程碑 ========== */
.page-about .about-milestones {
  background: var(--ink-900);
  color: var(--silver-200);
}
.page-about .about-milestones .section-title { color: var(--paper); }
.page-about .about-milestones__figure {
  margin: 0 0 var(--gap-lg);
}
.page-about .milestones {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  position: relative;
}
.page-about .milestones::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--brass-500) 0%, rgba(197, 139, 78, 0.12) 100%);
}
.page-about .milestone {
  position: relative;
  padding: clamp(14px, 2vw, 20px) 0;
}
.page-about .milestone::before {
  content: "";
  position: absolute;
  left: -31.5px;
  top: calc(clamp(14px, 2vw, 20px) + 14px);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brass-500);
  box-shadow: 0 0 0 3px var(--ink-900);
}
.page-about .milestone__stamp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--brass-500);
  margin-bottom: 6px;
}
.page-about .milestone details {
  border-top: 1px solid var(--hairline);
}
.page-about .milestone__summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 0 14px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}
.page-about .milestone__summary::-webkit-details-marker { display: none; }
.page-about .milestone__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--brass-500);
  flex-shrink: 0;
  transition: transform 0.2s var(--ease);
}
.page-about .milestone details[open] .milestone__summary::after {
  content: "−";
}
.page-about .milestone__title {
  font-family: var(--font-cn);
  font-weight: 700;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.45;
  color: var(--paper);
}
.page-about .milestone__summary:hover .milestone__title,
.page-about .milestone__summary:focus-visible .milestone__title {
  color: var(--brass-300);
}
.page-about .milestone__body {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver-200);
  padding: 0 0 20px;
  max-width: 62ch;
}

/* ========== 协作生态 ========== */
.page-about .about-partners {
  background: var(--silver-050);
  color: var(--ink-800);
}
.page-about .about-partners .panel-head .lede { color: var(--ink-700); }
.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
}
.page-about .partner {
  position: relative;
  padding: clamp(24px, 3.4vw, 32px);
  background: var(--paper);
  border: 1px solid rgba(16, 29, 68, 0.12);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.page-about .partner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 42px;
  height: 2px;
  background: var(--brass-500);
}
.page-about .partner__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-800);
  margin: 0;
}
.page-about .partner__label {
  font-family: var(--font-cn);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--brass-500);
  margin: 0;
}
.page-about .partner__desc {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-700);
  margin: 4px 0 0;
}

/* ========== 承诺与 CTA ========== */
.page-about .about-cta {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--silver-200);
  padding-block: clamp(56px, 9vw, 104px);
  border-top: 1px solid rgba(197, 139, 78, 0.3);
}
.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 20% 0%, rgba(22, 217, 190, 0.12), transparent 50%),
    radial-gradient(circle at 88% 100%, rgba(197, 139, 78, 0.16), transparent 48%),
    linear-gradient(160deg, var(--ink-900), var(--ink-800));
}
.page-about .about-cta__slash {
  position: absolute;
  top: -20%;
  left: -10%;
  width: 56%;
  height: 140%;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(
    118deg,
    transparent 48%,
    rgba(22, 217, 190, 0.07) 48.3%,
    rgba(22, 217, 190, 0.07) 49%,
    transparent 49.3%
  );
  transform: rotate(6deg);
}
.page-about .about-cta .eyebrow { color: var(--teal-400); }
.page-about .about-cta .eyebrow::before { background: var(--teal-400); }
.page-about .about-cta .section-title {
  color: var(--paper);
  max-width: 18ch;
  margin-bottom: clamp(24px, 3.4vw, 36px);
}
.page-about .about-cta__inner { max-width: 62ch; }
.page-about .commitments {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}
.page-about .commitment {
  background: rgba(8, 18, 46, 0.6);
  padding: clamp(18px, 2.4vw, 26px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .commitment__title {
  font-family: var(--font-cn);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--brass-300);
}
.page-about .commitment__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver-200);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}
.page-about .about-cta__link {
  font-size: 13.5px;
  color: var(--silver-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 211, 230, 0.4);
  padding-bottom: 2px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .about-cta__link span { font-family: var(--font-mono); }
.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  color: var(--teal-400);
  border-bottom-color: var(--teal-400);
}

/* ========== 响应式 ========== */
@media (min-width: 640px) {
  .page-about .street-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .about-partners__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .commitments { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }
  .page-about .about-story__grid {
    grid-template-columns: 7fr 5fr;
  }
  .page-about .about-team__grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .street-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .process { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .page-about .process__step {
    border-bottom: none;
    border-right: 1px solid rgba(16, 29, 68, 0.18);
    padding-right: 24px;
  }
  .page-about .process__step:last-child { border-right: none; }
  .page-about .about-partners__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 1120px) {
  .page-about .about-hero h1 { font-size: clamp(48px, 4.6vw, 60px); }
  .page-about .about-story__figure { margin-top: clamp(40px, 4.4vw, 72px); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role,
  .page-about .street,
  .page-about .street__link span,
  .page-about .milestone__summary::after,
  .page-about .breadcrumb a {
    transition: none !important;
  }
  .page-about .role:hover { transform: none; }
}
<<<END>>>