.page-about {
  --ab-pad: clamp(40px, 7vw, 88px);
  --ab-rule-bg: #13203a;
  background: var(--yf-night);
  color: var(--yf-snow);
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  letter-spacing: -0.02em;
  line-height: 1.12;
}

.page-about h2 {
  font-size: clamp(1.6rem, 3.6vw, 2.75rem);
  font-weight: 800;
  margin: 10px 0 0;
}

.page-about p {
  color: var(--yf-snow);
  line-height: 1.85;
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  padding: clamp(18px, 4vw, 34px) 0 clamp(40px, 6vw, 84px);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(111, 227, 196, 0.13), transparent 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(255, 106, 61, 0.08), transparent 62%),
    var(--yf-night);
}

.page-about .ab-hero__inner {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  align-items: end;
}

.page-about .ab-hero__copy {
  min-width: 0;
}

.page-about .ab-hero .yf-crumbs {
  margin-bottom: 18px;
  font-size: var(--yf-t14);
}

.page-about .ab-hero h1 {
  font-size: clamp(2rem, 6vw, 3.7rem);
  font-weight: 800;
  margin: 12px 0 0;
  max-width: 16em;
}

.page-about .ab-hero__lead {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: var(--yf-t18);
  color: var(--yf-snow);
}

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

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 30px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--yf-line);
}

.page-about .ab-hero__stats div {
  min-width: 0;
}

.page-about .ab-hero__stats dt {
  font-size: var(--yf-t14);
  color: var(--yf-mist);
}

.page-about .ab-hero__stats dd {
  margin: 6px 0 0;
  font-family: var(--yf-mono);
  font-size: var(--yf-t22);
  color: var(--yf-mint);
  letter-spacing: -0.01em;
}

.page-about .ab-hero__paper {
  background: var(--yf-paper);
  color: var(--yf-ink);
  border-radius: var(--yf-radius-l);
  padding: 26px 22px 22px;
  clip-path: polygon(0 9%, 100% 0, 100% 100%, 0 100%);
  min-width: 0;
}

.page-about .ab-paper__k {
  margin: 0;
  font-family: var(--yf-mono);
  font-size: var(--yf-t14);
  letter-spacing: 0.06em;
  color: #6b5f52;
}

.page-about .ab-paper__v {
  margin: 8px 0 0;
  font-family: var(--yf-mono);
  font-size: clamp(3rem, 9vw, 4.5rem);
  line-height: 1;
  font-weight: 700;
  color: var(--yf-ink);
}

.page-about .ab-paper__v span {
  font-size: var(--yf-t18);
  margin-left: 6px;
  letter-spacing: 0;
}

.page-about .ab-paper__ruler {
  height: 16px;
  margin: 18px 0 14px;
  background: repeating-linear-gradient(90deg, var(--yf-ink) 0 2px, transparent 2px 11.111%);
  opacity: 0.32;
}

.page-about .ab-paper__note {
  margin: 0;
  font-size: var(--yf-t14);
  line-height: 1.6;
  color: #4a423a;
}

/* 斜切色带 */
.page-about .ab-slice {
  height: 24px;
  background: linear-gradient(90deg, rgba(111, 227, 196, 0.45), rgba(255, 106, 61, 0.22) 62%, rgba(111, 227, 196, 0.1));
  clip-path: polygon(0 62%, 100% 0, 100% 100%, 0 100%);
}

.page-about .ab-slice--flip {
  clip-path: polygon(0 0, 100% 62%, 100% 100%, 0 100%);
  background: linear-gradient(90deg, rgba(166, 242, 92, 0.28), rgba(111, 227, 196, 0.4));
}

/* 通用章节 */
.page-about .ab-chapter,
.page-about .ab-principles,
.page-about .ab-team,
.page-about .ab-partners {
  padding: var(--ab-pad) 0;
}

.page-about .yf-chapter__num {
  display: inline-block;
  font-family: var(--yf-mono);
  font-size: var(--yf-t28);
  line-height: 1;
  color: var(--yf-mist);
  transition: color 200ms var(--yf-ease);
}

.page-about [data-chapter][data-active] .yf-chapter__num {
  color: var(--yf-mint);
}

.page-about .ab-chapter__grid {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .ab-chapter__body p {
  margin: 0 0 1.1em;
  max-width: 36em;
}

.page-about .ab-points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-points li {
  position: relative;
  padding-left: 20px;
  font-size: var(--yf-t14);
  line-height: 1.8;
  color: var(--yf-mist);
}

.page-about .ab-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 2px;
  border-radius: 2px;
  background: var(--yf-mint);
}

.page-about .ab-points strong {
  color: var(--yf-snow);
  margin-right: 4px;
}

.page-about .ab-aside {
  background: var(--yf-panel);
  border: 1px solid var(--yf-line);
  border-radius: var(--yf-radius-l);
  padding: 22px 20px;
}

.page-about .ab-aside__title {
  margin: 0 0 14px;
  font-family: var(--yf-mono);
  font-size: var(--yf-t14);
  letter-spacing: 0.06em;
  color: var(--yf-mint);
}

.page-about .ab-aside__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-aside__list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--yf-line);
  font-size: var(--yf-t14);
  color: var(--yf-mist);
}

.page-about .ab-aside__list b {
  font-family: var(--yf-mono);
  font-size: var(--yf-t18);
  font-weight: 600;
  color: var(--yf-snow);
  white-space: nowrap;
}

.page-about .ab-aside__note {
  margin: 14px 0 0;
  font-size: var(--yf-t14);
  line-height: 1.7;
  color: var(--yf-mist);
}

/* 章节头 */
.page-about .ab-secthead {
  max-width: 46em;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .ab-secthead__lead {
  margin: 14px 0 0;
  font-size: var(--yf-t18);
  color: var(--yf-mist);
  max-width: 34em;
}

/* 原则 */
.page-about .ab-principles {
  background: linear-gradient(180deg, transparent, rgba(17, 28, 46, 0.65) 40%, transparent);
}

.page-about .ab-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-rule {
  position: relative;
  padding: 24px 22px 22px;
  background: var(--yf-panel);
  border: 1px solid var(--yf-line);
  border-radius: var(--yf-radius-l);
  transition: transform var(--yf-dur) var(--yf-ease), border-color var(--yf-dur) var(--yf-ease), background-color var(--yf-dur) var(--yf-ease);
}

.page-about .ab-rule:hover,
.page-about .ab-rule:focus-within {
  transform: translateY(-2px);
  border-color: rgba(111, 227, 196, 0.55);
  background: var(--ab-rule-bg);
}

.page-about .ab-rule__idx {
  display: inline-block;
  font-family: var(--yf-mono);
  font-size: var(--yf-t14);
  color: var(--yf-mint);
  border: 1px solid rgba(111, 227, 196, 0.5);
  border-radius: 999px;
  padding: 3px 12px;
}

.page-about .ab-rule h3 {
  font-size: var(--yf-t22);
  font-weight: 800;
  margin: 14px 0 0;
}

.page-about .ab-rule__text {
  margin: 12px 0 0;
  font-size: var(--yf-t14);
  color: var(--yf-mist);
}

.page-about .ab-rule__scene {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--yf-line);
  font-size: var(--yf-t14);
  line-height: 1.7;
  color: var(--yf-mist);
  transition: border-color var(--yf-dur) var(--yf-ease), color var(--yf-dur) var(--yf-ease);
}

.page-about .ab-rule:hover .ab-rule__scene,
.page-about .ab-rule:focus-within .ab-rule__scene {
  border-color: var(--yf-mint);
  color: var(--yf-snow);
}

.page-about .ab-rule__scene span {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--yf-mono);
  font-size: var(--yf-t14);
  color: var(--yf-lime);
}

/* 色卡图 */
.page-about .ab-swatch {
  margin: 0 auto clamp(36px, 6vw, 72px);
  padding: 0 clamp(20px, 5vw, 0px);
}

.page-about .ab-swatch img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--yf-radius-l);
  border: 1px solid var(--yf-line);
  object-fit: cover;
}

.page-about .ab-swatch .yf-media__caption {
  margin-top: 12px;
  font-size: var(--yf-t14);
  line-height: 1.7;
  color: var(--yf-mist);
}

/* 时间轴 */
.page-about .ab-tl {
  position: relative;
  overflow: hidden;
  padding: var(--ab-pad) 0;
}

.page-about .ab-tl__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
  filter: saturate(0.7);
}

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

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

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 24px 28px;
  border-left: 1px solid var(--yf-line);
}

.page-about .ab-tl__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -5.5px;
  top: 12px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--yf-mint);
  box-shadow: 0 0 0 4px rgba(111, 227, 196, 0.12);
}

.page-about .ab-node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 6px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-node summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--yf-mono);
  color: var(--yf-mist);
}

.page-about .ab-node[open] summary::after {
  content: "−";
  color: var(--yf-mint);
}

.page-about .ab-node__year {
  font-family: var(--yf-mono);
  font-size: var(--yf-t14);
  letter-spacing: 0.04em;
  color: var(--yf-mint);
}

.page-about .ab-node__title {
  font-size: var(--yf-t22);
  font-weight: 800;
  color: var(--yf-snow);
}

.page-about .ab-node__text {
  margin: 10px 0 0;
  max-width: 34em;
  font-size: var(--yf-t14);
  line-height: 1.8;
  color: var(--yf-mist);
}

/* 团队 */
.page-about .ab-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .ab-team__copy p {
  margin: 16px 0 0;
  max-width: 34em;
  color: var(--yf-mist);
}

.page-about .ab-team__list {
  margin: 26px 0 0;
  display: grid;
  gap: 16px;
}

.page-about .ab-team__list div {
  padding-left: 16px;
  border-left: 2px solid var(--yf-line);
}

.page-about .ab-team__list dt {
  font-family: var(--yf-mono);
  font-size: var(--yf-t18);
  color: var(--yf-mint);
}

.page-about .ab-team__list dd {
  margin: 6px 0 0;
  font-size: var(--yf-t14);
  line-height: 1.75;
  color: var(--yf-mist);
}

.page-about .ab-team__media {
  margin: 0;
}

.page-about .ab-team__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--yf-radius-l);
}

.page-about .ab-team__media .yf-media__caption {
  margin-top: 12px;
  font-size: var(--yf-t14);
  line-height: 1.7;
  color: var(--yf-mist);
}

/* 合作生态 */
.page-about .ab-partners__grid {
  display: grid;
  gap: 14px;
}

.page-about .ab-partner {
  background: var(--yf-panel);
  border: 1px solid var(--yf-line);
  border-radius: var(--yf-radius-l);
  padding: 24px 22px;
  transition: transform var(--yf-dur) var(--yf-ease), border-color var(--yf-dur) var(--yf-ease);
}

.page-about .ab-partner:hover {
  transform: translateY(-2px);
  border-color: rgba(111, 227, 196, 0.45);
}

.page-about .ab-partner--lead {
  background: var(--yf-paper);
  border-color: var(--yf-paper);
}

.page-about .ab-partner__k {
  margin: 0;
  font-family: var(--yf-mono);
  font-size: var(--yf-t14);
  letter-spacing: 0.06em;
  color: var(--yf-mint);
}

.page-about .ab-partner--lead .ab-partner__k {
  color: #6b5f52;
}

.page-about .ab-partner__n {
  margin: 10px 0 0;
  font-size: var(--yf-t28);
  font-weight: 800;
  color: var(--yf-snow);
}

.page-about .ab-partner--lead .ab-partner__n {
  color: var(--yf-ink);
}

.page-about .ab-partner__text {
  margin: 12px 0 0;
  font-size: var(--yf-t14);
  line-height: 1.8;
  color: var(--yf-mist);
}

.page-about .ab-partner--lead .ab-partner__text {
  color: #3a332c;
}

/* 年度报告 */
.page-about .ab-report {
  padding: var(--ab-pad) 0;
}

.page-about .ab-report__inner {
  background: var(--yf-paper);
  color: var(--yf-ink);
  border-radius: var(--yf-radius-l);
  padding: clamp(28px, 5vw, 56px) clamp(22px, 4vw, 52px);
  max-width: min(var(--yf-wrap), calc(100% - 2 * clamp(20px, 5vw, 0px)));
}

.page-about .ab-report .yf-chapter__num {
  color: #a1907c;
}

.page-about .ab-report h2 {
  color: var(--yf-ink);
}

.page-about .ab-report p {
  margin: 16px 0 0;
  max-width: 40em;
  color: #3a332c;
}

.page-about .ab-report__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  margin-top: 26px;
}

.page-about .ab-btn-ink {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 999px;
  border: 1px solid var(--yf-ink);
  font-weight: 700;
  font-size: var(--yf-t14);
  color: var(--yf-ink);
  text-decoration: none;
  transition: background-color var(--yf-dur) var(--yf-ease), color var(--yf-dur) var(--yf-ease);
}

.page-about .ab-btn-ink:hover {
  background: var(--yf-ink);
  color: var(--yf-paper);
}

.page-about .ab-report__link {
  font-size: var(--yf-t14);
  color: #5a4e42;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .ab-report__link:hover {
  color: var(--yf-ink);
}

/* 焦点可见 */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--yf-mint);
  outline-offset: 3px;
  border-radius: 6px;
}

/* 平板及以上 */
@media (min-width: 760px) {
  .page-about .ab-rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: stretch;
  }

  .page-about .ab-rule:nth-child(2) {
    margin-top: 28px;
  }

  .page-about .ab-partners__grid {
    grid-template-columns: 1.4fr 1fr 1.1fr;
    align-items: start;
  }

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

/* 桌面 */
@media (min-width: 980px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 7.2fr) minmax(0, 4fr);
    gap: clamp(28px, 3vw, 56px);
  }

  .page-about .ab-hero__paper {
    padding: 40px 30px 28px;
    clip-path: polygon(0 16%, 100% 0, 100% 100%, 0 100%);
  }

  .page-about .ab-chapter__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .ab-chapter__head {
    grid-column: 1 / 5;
    position: sticky;
    top: calc(var(--yf-hh, 64px) + 24px);
  }

  .page-about .ab-chapter__body {
    grid-column: 5 / 10;
  }

  .page-about .ab-aside {
    grid-column: 10 / 13;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 6.5fr) minmax(0, 4.5fr);
    align-items: center;
  }

  .page-about .ab-tl__list {
    max-width: 760px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rule,
  .page-about .ab-partner,
  .page-about .ab-rule__scene,
  .page-about .yf-chapter__num,
  .page-about .ab-btn-ink {
    transition: none;
  }

  .page-about .ab-rule:hover,
  .page-about .ab-partner:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>