.page-about {
  --about-rail: 288px;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 顶部信息条 */
.page-about .about-strip {
  background: var(--ink);
  border-bottom: 3px solid var(--blue);
}
.page-about .about-strip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 20px;
  padding-top: 11px;
  padding-bottom: 11px;
}
.page-about .about-strip__inner .crumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--stone);
}
.page-about .about-strip__inner .crumbs a {
  color: var(--mist);
  text-decoration: none;
}
.page-about .about-strip__inner .crumbs a:hover {
  color: var(--cyan);
}
.page-about .about-strip__inner .crumbs__sep {
  margin: 0 7px;
  color: var(--stone);
}
.page-about .about-strip__inner [aria-current="page"] {
  color: var(--paper);
}
.page-about .about-strip__tag {
  margin: 0;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding-top: 34px;
  background: var(--cream);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 240px;
  background: linear-gradient(115deg, rgba(29, 78, 216, .13), rgba(169, 92, 63, .13) 58%, rgba(244, 240, 232, 0) 86%);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 0 100%);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 26px;
  padding-bottom: 30px;
}
.page-about .about-hero__eyebrow {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--clay);
}
.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(29px, 6.2vw, 54px);
  line-height: 1.1;
  letter-spacing: -.01em;
  max-width: 16em;
}
.page-about .about-hero__lead {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  margin-top: 22px;
}
.page-about .about-hero__link {
  font-size: 14px;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(29, 78, 216, .38);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-hero__link:hover {
  color: var(--deep);
  border-color: var(--deep);
}
.page-about .about-hero__figure {
  position: relative;
  margin: 0;
}
.page-about .about-hero__figure img {
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  background: var(--mist);
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, 100% 0, 100% 86%, 88% 100%, 0 100%);
}
.page-about .about-hero__badge {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 11px;
  background: var(--ink);
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: .06em;
}

/* 关键数字带 */
.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-strong);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}
.page-about .about-stats li {
  background: var(--paper);
  padding: 16px 14px;
}
.page-about .about-stats__num {
  display: block;
  font-size: clamp(20px, 4.6vw, 27px);
  line-height: 1.1;
  color: var(--deep);
  letter-spacing: -.01em;
}
.page-about .about-stats__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--stone);
  line-height: 1.5;
}

/* 主体双栏 */
.page-about .about-body {
  padding-top: 40px;
}
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

/* 章节目录 */
.page-about .about-rail {
  align-self: start;
}
.page-about .index-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--stone);
}
.page-about .index-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-about .index-rail__list a {
  display: block;
  padding: 6px 10px;
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .index-rail__list a:hover {
  color: var(--blue);
  border-color: var(--blue);
}
.page-about .index-rail__list a[aria-current="true"] {
  color: var(--paper);
  background: var(--deep);
  border-color: var(--deep);
}
.page-about .about-rail__note {
  margin: 14px 0 0;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--stone);
}

/* 章节标题 */
.page-about .about-sec {
  padding-bottom: 52px;
  scroll-margin-top: calc(var(--header-h) + 18px);
}
.page-about .about-main > .about-sec:last-child {
  padding-bottom: 20px;
}
.page-about .sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 12px;
  padding-bottom: 12px;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--ink);
}
.page-about .sec-head__num {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--orange);
}
.page-about .sec-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.6vw, 31px);
  line-height: 1.22;
  font-weight: 700;
}
.page-about .sec-head__note {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

/* 正文段落 */
.page-about .about-text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--ink);
}
.page-about .about-text p:last-child {
  margin-bottom: 0;
}
.page-about .about-mark {
  font-weight: 700;
  background: linear-gradient(transparent 62%, rgba(255, 106, 42, .30) 62%);
}

/* 原则卡 */
.page-about .about-rules {
  display: grid;
  gap: 12px;
}
.page-about .about-rule {
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--blue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}
.page-about .about-rule--moss { border-left-color: var(--moss); }
.page-about .about-rule--clay { border-left-color: var(--clay); }
.page-about .about-rule--stone { border-left-color: var(--stone); }
.page-about .about-rule summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 4px 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-rule summary::-webkit-details-marker {
  display: none;
}
.page-about .about-rule summary::after {
  content: "+";
  grid-column: 3;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--stone);
}
.page-about .about-rule[open] summary::after {
  content: "–";
  color: var(--blue);
}
.page-about .about-rule__num {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--clay);
  padding-top: 4px;
}
.page-about .about-rule__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
}
.page-about .about-rule__hint {
  grid-column: 2;
  font-size: 11px;
  letter-spacing: .05em;
  color: var(--stone);
}
.page-about .about-rule__body {
  padding: 0 16px 16px;
  animation: about-fade var(--dur) var(--ease);
}
.page-about .about-rule__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink);
}
@keyframes about-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* 时间轴 */
.page-about .about-time {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  position: relative;
}
.page-about .about-time::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--clay), var(--blue) 55%, var(--moss));
  transform: skewX(-5deg);
  transform-origin: top center;
}
.page-about .about-time__item {
  position: relative;
  padding: 0 0 18px 32px;
}
.page-about .about-time__item:last-child {
  padding-bottom: 0;
}
.page-about .about-time__dot {
  position: absolute;
  left: 1px;
  top: 6px;
  width: 16px;
  height: 16px;
  background: var(--paper);
  border: 2px solid var(--clay);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}
.page-about .about-time__item:last-child .about-time__dot {
  background: var(--orange);
  border-color: var(--orange);
}
.page-about .about-time__card {
  background: var(--paper);
  border: 1px solid var(--line-strong);
  padding: 13px 15px;
}
.page-about .about-time__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .05em;
  color: var(--stone);
}
.page-about .about-time__card h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.3;
}
.page-about .about-time__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink);
}
.page-about .about-time__figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--mist);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: 20px;
}
.page-about .about-team__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.page-about .about-team__card {
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-top: 3px solid var(--moss);
  padding: 13px;
}
.page-about .about-team__num {
  margin: 0;
  font-size: 24px;
  line-height: 1;
  color: var(--moss);
}
.page-about .about-team__card h3 {
  margin: 8px 0 5px;
  font-size: 15px;
  font-weight: 700;
}
.page-about .about-team__card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}
.page-about .about-flow {
  counter-reset: flow;
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-about .about-flow li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 9px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink);
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line-strong);
}
.page-about .about-flow li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-flow li::before {
  counter-increment: flow;
  content: "0" counter(flow);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--clay);
  padding-top: 2px;
}
.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--mist);
}

/* 深色覆盖区 */
.page-about .about-reach {
  background: linear-gradient(155deg, var(--deep), var(--ink) 74%);
  color: var(--paper);
  padding: 24px 18px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}
.page-about .about-reach__eyebrow {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}
.page-about .about-reach h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.6vw, 30px);
  line-height: 1.25;
  color: var(--paper);
}
.page-about .about-reach p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 240, 232, .82);
}
.page-about .about-reach__stats {
  list-style: none;
  margin: 16px 0;
  padding: 16px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  border-top: 1px solid var(--line-invert);
}
.page-about .about-reach__stats b {
  display: block;
  font-size: clamp(19px, 4.4vw, 26px);
  font-weight: 500;
  line-height: 1.1;
  color: var(--cyan);
  transition: color var(--dur) var(--ease);
}
.page-about .about-reach__stats li:hover b {
  color: var(--orange);
}
.page-about .about-reach__stats span {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  line-height: 1.5;
  color: rgba(244, 240, 232, .68);
}
.page-about .about-reach p:last-child {
  margin-bottom: 0;
}

/* 合作与认可 */
.page-about .about-partners {
  display: grid;
  gap: 16px;
}
.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-partners__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  padding: 13px 14px;
}
.page-about .about-partners__num {
  font-size: 20px;
  line-height: 1.1;
  color: var(--clay);
}
.page-about .about-partners__list h3 {
  margin: 0 0 5px;
  font-size: 15px;
  font-weight: 700;
}
.page-about .about-partners__list p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--stone);
}
.page-about .about-awards {
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-top: 4px solid var(--orange);
  padding: 15px 16px;
}
.page-about .about-awards__eyebrow {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--stone);
}
.page-about .about-awards__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-awards__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}
.page-about .about-awards__note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--stone);
}

/* 结尾行动区 */
.page-about .about-cta {
  margin-top: 14px;
  background: var(--orange);
  color: var(--ink);
}
.page-about .about-cta__inner {
  padding-top: 36px;
  padding-bottom: 36px;
  display: grid;
  gap: 12px;
  justify-items: start;
}
.page-about .about-cta__eyebrow {
  margin: 0;
  font-size: 11px;
  letter-spacing: .14em;
  color: rgba(14, 17, 22, .72);
}
.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 4vw, 34px);
  line-height: 1.2;
  color: var(--ink);
}
.page-about .about-cta p {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(14, 17, 22, .84);
}
.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
  margin-top: 6px;
}
.page-about .about-cta__link {
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(14, 17, 22, .45);
  padding-bottom: 2px;
}
.page-about .about-cta__link:hover {
  border-color: var(--ink);
}
.page-about .about-totop {
  margin-top: 14px;
  padding: 10px 15px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--paper);
  background: var(--ink);
  border: 0;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background var(--dur) var(--ease);
}
.page-about .about-totop:hover,
.page-about .about-totop:focus-visible {
  background: var(--deep);
}

/* 桌面端 */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .sec-head {
    grid-template-columns: auto minmax(0, 1fr) auto;
  }
  .page-about .sec-head__note {
    grid-column: 3;
    justify-self: end;
    text-align: right;
    max-width: 22em;
  }
  .page-about .about-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
    gap: 24px;
  }
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 18px;
  }
  .page-about .about-reach {
    padding: 30px 28px;
  }
  .page-about .about-reach__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 46px;
  }
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 48px;
    align-items: end;
    padding-bottom: 40px;
  }
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 52px;
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 22px);
  }
  .page-about .index-rail__list {
    display: block;
    border-left: 2px solid var(--line-strong);
  }
  .page-about .index-rail__list li + li {
    margin-top: 2px;
  }
  .page-about .index-rail__list a {
    border: 0;
    background: transparent;
    border-left: 2px solid transparent;
    margin-left: -2px;
    padding: 8px 0 8px 14px;
    font-size: 14px;
  }
  .page-about .index-rail__list a[aria-current="true"] {
    color: var(--blue);
    background: transparent;
    border-left-color: var(--blue);
    font-weight: 700;
  }
  .page-about .about-body {
    padding-top: 52px;
  }
  .page-about .about-sec {
    padding-bottom: 64px;
  }
  .page-about .about-text p {
    font-size: 16.5px;
  }
  .page-about .about-cta__inner {
    padding-top: 46px;
    padding-bottom: 46px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rule__body {
    animation: none;
  }
  .page-about .about-hero__link,
  .page-about .index-rail__list a,
  .page-about .about-reach__stats b,
  .page-about .about-totop {
    transition: none;
  }
}