.page-about {
  --pb-rail: 96px;
  --pb-sec-y: clamp(56px, 8vw, 100px);
  --pb-para: 62ch;
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .pb-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .pb-sec {
  padding-block: var(--pb-sec-y);
}

.page-about .pb-p {
  max-width: var(--pb-para);
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink);
  margin: 0 0 16px;
}

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

.page-about .nb-kicker {
  color: var(--brown);
  margin-bottom: 14px;
}

.page-about .nb-h2 {
  margin: 0 0 22px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-about .nb-h3 {
  margin: 0 0 10px;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.35;
}

.page-about .pb-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .pb-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--brown);
}

.page-about .pb-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
}

/* ---------- 首屏框景 ---------- */

.page-about .pb-hero {
  padding-block: clamp(88px, 11vw, 140px) clamp(32px, 5vw, 56px);
  background:
    radial-gradient(120% 80% at 6% 0%, rgba(241, 228, 207, 0.95) 0%, rgba(251, 246, 236, 0) 64%),
    var(--paper);
}

.page-about .nb-crumbs {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .pb-hero__frame {
  position: relative;
  border: 1px solid var(--clay);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 4vw, 52px);
  background:
    repeating-linear-gradient(to right, var(--clay) 0 1px, transparent 1px 64px) top left / 100% 8px no-repeat,
    var(--white);
}

.page-about .pb-hero__frame::before,
.page-about .pb-hero__frame::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid var(--amber);
}

.page-about .pb-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
  border-radius: 10px 0 0 0;
}

.page-about .pb-hero__frame::after {
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
  border-radius: 0 0 10px 0;
}

.page-about .pb-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brown);
}

.page-about .pb-hero__title {
  margin: 20px 0 0;
  font-size: clamp(36px, 6.2vw, 86px);
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .pb-hero__foot {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(28px, 4vw, 52px);
  padding-top: clamp(20px, 3vw, 32px);
  border-top: var(--line-soft);
}

.page-about .pb-hero__lead {
  max-width: 58ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--brown);
  margin: 0;
}

.page-about .pb-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 12px;
}

.page-about .pb-hero__stats li {
  display: grid;
  gap: 4px;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
}

.page-about .pb-hero__stats strong {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--brown);
}

.page-about .pb-hero__stats span {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--brown);
  opacity: 0.82;
}

/* ---------- 起点 ---------- */

.page-about .pb-start {
  background: var(--paper);
}

.page-about .pb-start__grid {
  display: grid;
  gap: clamp(28px, 5vw, 64px);
}

.page-about .pb-start__note {
  margin-top: 24px;
  color: var(--brown);
}

.page-about .pb-start__ticket {
  align-self: start;
  border: 1px solid var(--clay);
  border-radius: var(--radius-md);
  background: var(--sand);
  padding: clamp(20px, 3vw, 32px);
}

.page-about .pb-start__ticket-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--white);
  background: var(--brown);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
}

.page-about .pb-start__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  counter-reset: pbq;
}

.page-about .pb-start__list li {
  display: grid;
  grid-template-columns: 4.4em 1fr;
  gap: 10px;
  padding: 12px 0;
  border-bottom: var(--line-soft);
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
}

.page-about .pb-start__list li:last-child {
  border-bottom: 0;
}

.page-about .pb-start__list .pb-mono {
  font-size: 13px;
  color: var(--gold);
  letter-spacing: 0.06em;
}

.page-about .pb-start__ticket-foot {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--brown);
  padding-left: 12px;
  border-left: 2px solid var(--gold);
}

/* ---------- 年份标尺 ---------- */

.page-about .pb-timeline {
  background: linear-gradient(180deg, var(--paper) 0%, var(--sand) 42%, var(--paper) 100%);
}

.page-about .pb-timeline__title {
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .pb-rail {
  position: relative;
}

.page-about .pb-rail::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: var(--pb-rail);
  width: 1px;
  background-image: repeating-linear-gradient(
    to bottom,
    var(--clay) 0 1px,
    transparent 1px 10px
  );
}

.page-about .pb-mile {
  display: grid;
  grid-template-columns: var(--pb-rail) minmax(0, 1fr);
  border-top: var(--line);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: background var(--dur-slow) var(--ease);
}

.page-about .pb-mile:hover,
.page-about .pb-mile:focus-within {
  background: rgba(241, 228, 207, 0.7);
}

.page-about .pb-mile__year {
  position: relative;
  padding: 26px 0 26px 0;
  font-size: clamp(22px, 2.8vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--brown);
  transition: color var(--dur) var(--ease);
}

.page-about .pb-mile__year::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 14px;
  height: 2px;
  background: var(--gold);
  transform: translateY(-50%);
  transition: background var(--dur) var(--ease), width var(--dur) var(--ease);
}

.page-about .pb-mile:hover .pb-mile__year {
  color: var(--amber);
}

.page-about .pb-mile:hover .pb-mile__year::after {
  background: var(--amber);
  width: 24px;
}

.page-about .pb-mile__body {
  padding: 26px 0 26px clamp(16px, 3vw, 40px);
}

.page-about .pb-mile__body .pb-p {
  margin-bottom: 0;
  max-width: var(--pb-para);
  font-size: 15.5px;
  color: var(--brown);
}

.page-about .pb-mile__body .nb-h3 {
  color: var(--ink);
}

.page-about .pb-timeline__inset {
  display: grid;
  grid-template-columns: var(--pb-rail) minmax(0, 1fr);
  padding-block: 28px;
  border-top: var(--line);
}

.page-about .pb-timeline__inset > .nb-figure {
  grid-column: 2;
  margin: 0 0 0 clamp(16px, 3vw, 40px);
  max-width: 560px;
}

.page-about .pb-fig {
  margin: 0;
}

.page-about .pb-fig .nb-figure__media {
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--sand);
}

.page-about .pb-fig--wide .nb-figure__media {
  aspect-ratio: 10 / 7;
}

.page-about .pb-fig img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .nb-figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--brown);
}

.page-about .nb-figure__tag {
  background: var(--brown);
  color: var(--white);
  font-family: var(--font-mono);
}

/* ---------- 团队 ---------- */

.page-about .pb-team {
  background: var(--paper);
}

.page-about .pb-team__grid {
  display: grid;
  gap: clamp(32px, 5vw, 60px);
}

.page-about .pb-team__figure .nb-figure__media {
  aspect-ratio: 3 / 4;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--sand);
}

.page-about .pb-tabs {
  position: relative;
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .pb-tabs__input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  padding: 0;
  opacity: 0;
  clip-path: inset(50%);
  pointer-events: none;
}

.page-about .pb-tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .pb-tabs__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid var(--clay);
  border-radius: var(--radius-pill);
  background: transparent;
  font-size: 14px;
  color: var(--brown);
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .pb-tabs__label .pb-mono {
  font-size: 13px;
  color: var(--gold);
  transition: color var(--dur) var(--ease);
}

.page-about .pb-tabs__label:hover {
  border-color: var(--amber);
}

.page-about .pb-tabs__panels {
  margin-top: 20px;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--clay);
  border-radius: var(--radius-md);
  background: var(--white);
}

.page-about .pb-tabs__panel {
  display: none;
}

.page-about .pb-tabs__panel p {
  max-width: var(--pb-para);
}

.page-about #pb-tab-editor:checked ~ .pb-tabs__bar .pb-tabs__label[for="pb-tab-editor"],
.page-about #pb-tab-support:checked ~ .pb-tabs__bar .pb-tabs__label[for="pb-tab-support"],
.page-about #pb-tab-proof:checked ~ .pb-tabs__bar .pb-tabs__label[for="pb-tab-proof"] {
  background: var(--teal);
  border-color: var(--teal);
  color: var(--white);
}

.page-about #pb-tab-editor:checked ~ .pb-tabs__bar .pb-tabs__label[for="pb-tab-editor"] .pb-mono,
.page-about #pb-tab-support:checked ~ .pb-tabs__bar .pb-tabs__label[for="pb-tab-support"] .pb-mono,
.page-about #pb-tab-proof:checked ~ .pb-tabs__bar .pb-tabs__label[for="pb-tab-proof"] .pb-mono {
  color: var(--white);
}

.page-about #pb-tab-editor:checked ~ .pb-tabs__panels .pb-tabs__panel--editor,
.page-about #pb-tab-support:checked ~ .pb-tabs__panels .pb-tabs__panel--support,
.page-about #pb-tab-proof:checked ~ .pb-tabs__panels .pb-tabs__panel--proof {
  display: block;
}

.page-about #pb-tab-editor:focus-visible ~ .pb-tabs__bar .pb-tabs__label[for="pb-tab-editor"],
.page-about #pb-tab-support:focus-visible ~ .pb-tabs__bar .pb-tabs__label[for="pb-tab-support"],
.page-about #pb-tab-proof:focus-visible ~ .pb-tabs__bar .pb-tabs__label[for="pb-tab-proof"] {
  outline: 3px solid var(--amber);
  outline-offset: 2px;
}

/* ---------- 文档旅程 ---------- */

.page-about .pb-flow {
  background: var(--sand);
}

.page-about .pb-flow__title {
  max-width: 20ch;
}

.page-about .pb-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--clay);
  border: 1px solid var(--clay);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .pb-flow__step {
  background: var(--white);
  padding: clamp(20px, 3vw, 30px);
  transition: background var(--dur) var(--ease);
}

.page-about .pb-flow__step:hover {
  background: var(--paper);
}

.page-about .pb-flow__no {
  display: block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--amber);
  margin-bottom: 10px;
}

.page-about .pb-flow__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--brown);
}

.page-about .pb-flow__note {
  margin-top: clamp(20px, 3vw, 32px);
  max-width: 64ch;
  color: var(--ink);
}

/* ---------- 服务覆盖 ---------- */

.page-about .pb-reach {
  background: var(--paper);
}

.page-about .pb-reach__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .pb-reach__figure .nb-figure__media {
  aspect-ratio: 3 / 2;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--sand);
}

.page-about .pb-reach__figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 16px;
  margin-top: clamp(20px, 3vw, 32px);
  padding-top: clamp(18px, 3vw, 26px);
  border-top: var(--line-soft);
}

.page-about .pb-reach__figures div {
  display: grid;
  gap: 4px;
}

.page-about .pb-reach__figures strong {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  color: var(--teal);
  line-height: 1.1;
}

.page-about .pb-reach__figures span {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--brown);
}

/* ---------- 协作生态 ---------- */

.page-about .pb-eco {
  background: var(--sand);
}

.page-about .pb-eco__title {
  max-width: 22ch;
}

.page-about .pb-eco__lead {
  max-width: 66ch;
  color: var(--brown);
}

.page-about .pb-eco__row {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .pb-eco__item {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--clay);
  border-radius: var(--radius-md);
  background: var(--white);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .pb-eco__item:hover,
.page-about .pb-eco__item:focus-within {
  border-color: var(--amber);
  transform: translateY(-2px);
}

.page-about .pb-eco__num {
  display: block;
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: 1;
  color: var(--brown);
  letter-spacing: -0.02em;
}

.page-about .pb-eco__unit {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.page-about .pb-eco__note {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: var(--line-soft);
  font-size: 14px;
  line-height: 1.68;
  color: var(--brown);
  opacity: 0.78;
  transition: opacity var(--dur) var(--ease);
}

.page-about .pb-eco__item:hover .pb-eco__note {
  opacity: 1;
}

/* ---------- 三条做法 ---------- */

.page-about .pb-creed {
  background: var(--paper);
}

.page-about .pb-creed__title {
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .pb-creed__row {
  display: grid;
  gap: 14px;
}

.page-about .pb-creed__block {
  position: relative;
  padding: clamp(22px, 3.4vw, 36px);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.page-about .pb-creed__block:hover {
  border-color: var(--clay);
}

.page-about .pb-creed__block--a {
  background: var(--brown);
  color: var(--white);
}

.page-about .pb-creed__block--b {
  background: rgba(20, 125, 140, 0.1);
}

.page-about .pb-creed__block--c {
  background: var(--white);
  border-color: var(--clay);
}

.page-about .pb-creed__idx {
  display: block;
  font-size: 13px;
  letter-spacing: 0.2em;
  margin-bottom: 14px;
  color: var(--gold);
}

.page-about .pb-creed__block--b .pb-creed__idx {
  color: var(--teal);
}

.page-about .pb-creed__block p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  max-width: 34ch;
}

.page-about .pb-creed__block--a p {
  color: rgba(255, 253, 248, 0.86);
}

.page-about .pb-creed__block--a .nb-h3 {
  color: var(--white);
}

.page-about .pb-creed__block--b p,
.page-about .pb-creed__block--c p {
  color: var(--brown);
}

/* ---------- 结尾 ---------- */

.page-about .pb-cta {
  background: linear-gradient(180deg, var(--paper) 0%, var(--sand) 100%);
  padding-bottom: clamp(64px, 9vw, 112px);
}

.page-about .pb-cta__inner {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(26px, 4vw, 48px);
  border: 1px solid var(--clay);
  border-top: 3px solid var(--amber);
  border-radius: var(--radius-lg);
  background: var(--white);
}

.page-about .pb-cta__title {
  font-size: clamp(24px, 3.2vw, 36px);
  margin-bottom: 14px;
}

.page-about .pb-cta__text .pb-p {
  color: var(--brown);
  max-width: 60ch;
}

.page-about .pb-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .pb-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .pb-creed__row {
    grid-template-columns: 1.35fr 1fr 1.1fr;
  }
}

@media (min-width: 960px) {
  .page-about .pb-hero__foot {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .pb-start__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .pb-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .pb-team__figure {
    margin-top: 24px;
  }

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

  .page-about .pb-reach__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: center;
  }

  .page-about .pb-reach__figure {
    margin-top: 36px;
  }

  .page-about .pb-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (max-width: 600px) {
  .page-about {
    --pb-rail: 62px;
  }

  .page-about .pb-mile__year {
    font-size: 20px;
  }

  .page-about .pb-mile__body {
    padding-left: 14px;
  }

  .page-about .pb-timeline__inset > .nb-figure {
    margin-left: 14px;
  }

  .page-about .pb-hero__frame {
    border-radius: var(--radius-md);
  }

  .page-about .pb-hero__title br {
    display: none;
  }

  .page-about .pb-start__list li {
    grid-template-columns: 3.6em 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pb-mile,
  .page-about .pb-mile__year,
  .page-about .pb-mile__year::after,
  .page-about .pb-eco__item,
  .page-about .pb-eco__note,
  .page-about .pb-tabs__label,
  .page-about .pb-flow__step {
    transition: none;
  }

  .page-about .pb-eco__item:hover {
    transform: none;
  }
}
<<<END>>>