.page-about {
  padding-bottom: clamp(56px, 8vw, 112px);
}

/* ---------- 首屏声明与事实行 ---------- */
.page-about .ab-masthead {
  padding: clamp(24px, 4.5vw, 60px) 0 clamp(8px, 2vw, 18px);
}

.page-about .ab-h1 {
  margin: 8px 0 0;
  max-width: 14ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(40px, 7vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-family: var(--font-text);
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.7;
  color: var(--paper);
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  border-top: 1px solid var(--hair);
}

.page-about .ab-facts > div {
  padding: 14px 0;
  border-bottom: 1px solid var(--hair);
  min-width: 0;
}

.page-about .ab-fact-key {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .ab-fact-val {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--gold);
}

/* ---------- 章节框架 ---------- */
.page-about .ab-chapter {
  margin-top: clamp(48px, 7vw, 104px);
  padding-top: clamp(28px, 4vw, 52px);
  border-top: 1px solid var(--hair);
}

.page-about .ab-chapter-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .ab-chapter-head .chapter-num {
  position: static;
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  line-height: 1.4;
  color: var(--cyan);
}

.page-about .ab-chapter-head .section-title {
  margin: 0;
  font-size: clamp(26px, 3.4vw, 42px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-lead-sentence {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(24px, 2.8vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .body-text {
  margin: 0 0 14px;
  color: var(--mist);
}

.page-about .ab-stmt .body-text:last-child,
.page-about .ab-team-close {
  margin-bottom: 0;
}

/* ---------- 网格 ---------- */
.page-about .ab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 0;
  min-width: 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--hair);
  background-color: var(--slate);
}

.page-about .ab-figure--tall img {
  aspect-ratio: 2 / 3;
  object-fit: cover;
}

.page-about .ab-figure--wide img {
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .ab-figure--band {
  margin: clamp(20px, 3vw, 34px) 0 clamp(24px, 3.5vw, 40px);
}

.page-about .ab-figure--band img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-left: 0;
  border-right: 0;
}

.page-about figcaption,
.page-about .ab-figure .note {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 01 声明 ---------- */
.page-about .ab-statement {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(30px, 4.6vw, 54px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-maxims {
  list-style: none;
  margin: clamp(34px, 5vw, 60px) 0 0;
  padding: 0;
}

.page-about .ab-maxim {
  position: relative;
  padding: 26px 0 26px clamp(30px, 6vw, 78px);
  border-top: 1px solid var(--hair);
}

.page-about .ab-maxim:last-child {
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-quote-mark {
  position: absolute;
  left: 0;
  top: 14px;
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 66px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  opacity: 0.34;
}

.page-about .ab-maxim .sub-title {
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .ab-maxim .body-text {
  max-width: 62ch;
}

.page-about .ab-maxim-meta {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .ab-anchor-copy {
  margin-top: 12px;
  padding: 6px 12px;
  border: 1px solid var(--hair);
  border-radius: 2px;
  background: transparent;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
}

.page-about .ab-anchor-copy:hover,
.page-about .ab-anchor-copy:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .ab-anchor-copy:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .ab-anchor-copy.is-copied {
  color: var(--gold);
  border-color: var(--gold);
}

/* ---------- 02 栏目划分 ---------- */
.page-about .ab-rule-list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
}

.page-about .ab-rule-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-top: 1px solid var(--hair);
}

.page-about .ab-rule-list li:last-child {
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-rule-key {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .ab-rule-text {
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-aside {
  padding-left: 18px;
  border-left: 1px solid var(--hair);
}

.page-about .ab-aside .note {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .ab-aside .note:last-child {
  margin-bottom: 0;
}

.page-about .ab-aside a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-aside a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 03 审核流程阶梯 ---------- */
.page-about .ab-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(24px, 3.5vw, 40px);
}

.page-about .ab-step {
  position: relative;
  background-color: var(--carbon);
  border-radius: 2px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: background-color var(--dur-2) var(--ease);
}

.page-about .ab-step::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background-color: var(--moss);
}

.page-about .ab-step--gold::before {
  background-color: var(--gold);
}

.page-about .ab-step:hover {
  background-color: var(--hl);
}

.page-about .ab-step-sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 18px 22px;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-step-sum::-webkit-details-marker {
  display: none;
}

.page-about .ab-step-sum::marker {
  content: "";
}

.page-about .ab-step-sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--mist);
  transition: color var(--dur-1) var(--ease);
}

.page-about .ab-step[open] .ab-step-sum::after {
  content: "–";
  color: var(--cyan);
}

.page-about .ab-step-sum:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .ab-step-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .ab-step-name {
  font-family: var(--font-text);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .ab-step-time {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .ab-step-body {
  padding: 0 22px 22px;
  border-top: 1px solid var(--hair);
  margin-top: 2px;
  padding-top: 14px;
}

.page-about .ab-step-body p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--mist);
}

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

.page-about .ab-step-focus {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  border-radius: 2px;
  background-color: var(--moss);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.page-about .ab-step--gold .ab-step-focus {
  background-color: var(--gold);
}

/* ---------- 04 年度纪事 ---------- */
.page-about .ab-years {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-year {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--hair);
  transition: background-color var(--dur-2) var(--ease);
}

.page-about .ab-year:last-child {
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-year:hover {
  background-color: var(--slate);
}

.page-about .ab-year-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1.5;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .ab-year-title {
  margin: 0 0 6px;
  font-family: var(--font-text);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-year-main .list-summary {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-year-detail {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur-3) var(--ease);
}

.page-about .ab-year-detail > .ab-year-detail-inner {
  overflow: hidden;
}

.page-about .ab-year-detail-inner .list-summary {
  margin: 0;
  padding-top: 10px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .ab-year:hover .ab-year-detail,
.page-about .ab-year:focus-within .ab-year-detail {
  grid-template-rows: 1fr;
}

/* ---------- 05 团队 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin-top: clamp(20px, 3vw, 32px);
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-team-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 20px 0;
  border-top: 1px solid var(--hair);
}

.page-about .ab-team-count {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .ab-team-row .sub-title {
  margin: 0;
  color: var(--paper);
}

.page-about .ab-team-row .list-summary {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-team-close {
  margin-top: clamp(20px, 3vw, 32px);
  max-width: 68ch;
}

/* ---------- 尾段链接 ---------- */
.page-about .ab-next {
  margin-top: clamp(48px, 7vw, 96px);
  padding-top: clamp(24px, 3vw, 40px);
  border-top: 1px solid var(--hair);
}

.page-about .ab-next .sub-title {
  margin: 0 0 18px;
  color: var(--paper);
}

.page-about .ab-next-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-next-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 16px 0;
  border-top: 1px solid var(--hair);
}

.page-about .ab-next-list li:last-child {
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-next-list a {
  display: inline-block;
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
  text-decoration: none;
  transition: color var(--dur-1) var(--ease), transform var(--dur-1) var(--ease);
}

.page-about .ab-next-list li:hover a,
.page-about .ab-next-list a:focus-visible {
  color: var(--cyan);
  transform: translateX(2px);
}

.page-about .ab-next-list a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .ab-next-desc {
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-facts > div {
    padding-right: 18px;
    border-right: 1px solid var(--hair);
    border-bottom: 1px solid var(--hair);
  }

  .page-about .ab-facts > div:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-about .ab-rule-list li {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .ab-next-list li {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 800px) {
  .page-about .ab-grid--stmt {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .ab-grid--8-4 {
    grid-template-columns: 8fr 4fr;
    column-gap: clamp(32px, 5vw, 72px);
  }

  .page-about .ab-aside {
    position: sticky;
    top: calc(var(--topline) + 28px);
    align-self: start;
  }

  .page-about .ab-step-sum {
    padding: 20px 24px;
  }

  .page-about .ab-step-body {
    padding: 16px 24px 24px;
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    align-items: start;
  }

  .page-about .ab-step:nth-child(1) {
    margin-top: 0;
  }

  .page-about .ab-step:nth-child(2) {
    margin-top: 34px;
  }

  .page-about .ab-step:nth-child(3) {
    margin-top: 68px;
  }

  .page-about .ab-step-sum {
    padding: 18px 20px;
  }

  .page-about .ab-step-body {
    padding: 14px 20px 20px;
  }

  .page-about .ab-year {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: 28px;
    align-items: start;
    padding: 20px 0;
  }

  .page-about .ab-year-detail {
    grid-column: 2;
  }

  .page-about .ab-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-top: 1px solid var(--hair);
  }

  .page-about .ab-team-row {
    padding: 24px 20px;
    border-top: 0;
    border-left: 1px solid var(--hair);
    align-content: start;
  }

  .page-about .ab-team-row:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .ab-team-row:last-child {
    padding-right: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-statement {
    max-width: 22ch;
  }

  .page-about .ab-figure--band img {
    aspect-ratio: 8 / 3;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-year-detail,
  .page-about .ab-step,
  .page-about .ab-anchor-copy,
  .page-about .ab-next-list a {
    transition: none;
  }

  .page-about .ab-year:hover .ab-year-detail,
  .page-about .ab-year:focus-within .ab-year-detail {
    grid-template-rows: 1fr;
  }

  .page-about .ab-next-list li:hover a,
  .page-about .ab-next-list a:focus-visible {
    transform: none;
  }
}
<<<END>>>