.page-about {
  --ab-text: #C3CBD5;
  --ab-muted: #7E8896;
  --ab-gap: clamp(18px, 3vw, 40px);
  --ab-sec-pad: clamp(44px, 7vw, 92px);
  display: block;
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 首屏拼贴 ---------- */
.page-about .ab-hero {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--ab-gap);
  padding-top: clamp(20px, 3.5vw, 48px);
  padding-bottom: clamp(32px, 5vw, 64px);
}

.page-about .ab-hero__head {
  grid-column: 1 / -1;
}

.page-about .ab-hero__head h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 5vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper-hi);
  margin: 16px 0 0;
  max-width: 17ch;
}

.page-about .ab-hero__media {
  grid-column: 1 / -1;
  margin: 0;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-hero__intro {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.page-about .ab-hero__lede {
  margin: 0;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.75;
  color: var(--ab-text);
  max-width: 44ch;
}

.page-about .ab-hero__facts {
  list-style: none;
  margin: 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 14px;
}

.page-about .ab-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ab-muted);
}

.page-about .ab-num {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--flame);
  min-width: 5.2ch;
  flex: 0 0 auto;
}

@media (min-width: 860px) {
  .page-about .ab-hero__media {
    grid-column: 1 / 6;
    grid-row: 2;
  }
  .page-about .ab-hero__intro {
    grid-column: 6 / 13;
    grid-row: 2;
    justify-content: space-between;
    padding-top: 4px;
  }
}

/* ---------- 通用章节 ---------- */
.page-about .ab-sec {
  padding: var(--ab-sec-pad) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-sec__head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .ab-sec__head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper-hi);
  margin: 0;
  max-width: 22ch;
}

.page-about .ab-sec__head p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ab-muted);
  max-width: 48ch;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-axis {
  list-style: none;
  margin: 0;
  padding: 0 0 12px;
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-axis__item {
  position: relative;
  flex: 1 0 210px;
  padding-right: 26px;
}

.page-about .ab-axis__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper-hi);
}

.page-about .ab-axis__rail {
  display: block;
  position: relative;
  height: 1px;
  background: var(--line);
  margin: 16px 0 20px;
}

.page-about .ab-axis__rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: -5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--flame);
  transition: background 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .ab-axis__item:hover .ab-axis__rail::before {
  background: var(--flame);
  transform: scale(1.3);
}

.page-about .ab-axis__item:hover .ab-axis__rail {
  background: var(--flame-soft);
}

.page-about .ab-axis__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper-hi);
  letter-spacing: -0.01em;
}

.page-about .ab-axis__txt {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ab-muted);
  max-width: 30ch;
  transition: color 160ms var(--ease);
}

.page-about .ab-axis__item:hover .ab-axis__txt {
  color: var(--ab-text);
}

.page-about .ab-line__figure {
  margin: clamp(28px, 4vw, 48px) 0 0;
  aspect-ratio: 7 / 3;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .ab-line__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
}

.page-about .ab-index ol {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-index li {
  border-bottom: 1px solid var(--line);
}

.page-about .ab-index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 2px;
  text-decoration: none;
  color: var(--ab-text);
  font-size: 15px;
  line-height: 1.4;
  transition: color 140ms var(--ease), padding-left 140ms var(--ease);
}

.page-about .ab-index a:hover {
  color: var(--flame);
  padding-left: 12px;
}

.page-about .ab-index__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--graphite);
}

.page-about .ab-team__body article {
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-team__body article:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-team__body h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 1.5vw, 20px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper-hi);
  scroll-margin-top: 88px;
}

.page-about .ab-team__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ab-text);
  max-width: 54ch;
}

.page-about .ab-team__media {
  margin: clamp(26px, 4vw, 46px) 0 0;
  aspect-ratio: 4 / 3;
  max-height: 400px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .ab-team__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .ab-team__grid {
    grid-template-columns: minmax(180px, 232px) 1fr;
    gap: clamp(30px, 5vw, 72px);
  }
}

/* ---------- 覆盖（暖纸白反色区） ---------- */
.page-about .ab-cover {
  background: var(--paper);
  color: var(--ink-900);
  padding: clamp(26px, 4vw, 54px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 38px), calc(100% - 38px) 100%, 0 100%);
}

.page-about .ab-cover .ab-sec__head h2 {
  color: var(--ink-900);
}

.page-about .ab-cover .ab-sec__head p {
  color: #59616E;
}

.page-about .ab-cover__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(10, 14, 20, 0.16);
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .ab-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink-900);
  line-height: 1;
}

.page-about .ab-stat__label {
  font-size: 13px;
  letter-spacing: 0.02em;
  color: #59616E;
}

@media (min-width: 760px) {
  .page-about .ab-cover__stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-about .ab-bar {
  display: grid;
  gap: 18px;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .ab-bar__row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "label val"
    "track track";
  gap: 10px 12px;
  align-items: center;
}

.page-about .ab-bar__label {
  grid-area: label;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .ab-bar__val {
  grid-area: val;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .ab-bar__track {
  grid-area: track;
  position: relative;
  display: block;
  height: 16px;
  background: rgba(10, 14, 20, 0.1);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  transition: width 320ms var(--ease), filter 180ms var(--ease);
}

.page-about .ab-bar__fill--local {
  width: 26%;
  background: var(--flame);
}

.page-about .ab-bar__fill--other {
  width: 74%;
  background: var(--cyan-deep);
}

.page-about .ab-bar__row:hover .ab-bar__fill {
  filter: saturate(1.3) brightness(1.08);
}

@media (min-width: 720px) {
  .page-about .ab-bar__row {
    grid-template-columns: 168px 1fr 76px;
    grid-template-areas: "label track val";
    gap: 18px;
  }
}

.page-about .ab-cover__note {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding-top: 22px;
  border-top: 1px solid rgba(10, 14, 20, 0.16);
  font-size: 14.5px;
  line-height: 1.78;
  color: #404852;
  max-width: 62ch;
}

/* ---------- 资质 ---------- */
.page-about .ab-cred {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-cred__item {
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-cred__k {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ab-muted);
}

.page-about .ab-cred__v {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--flame);
}

.page-about .ab-cred__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ab-text);
  max-width: 34ch;
}

@media (min-width: 820px) {
  .page-about .ab-cred {
    grid-template-columns: repeat(3, 1fr);
    gap: 0 clamp(24px, 3vw, 40px);
  }
  .page-about .ab-cred__item {
    border-bottom: 0;
    padding-bottom: 0;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partner {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .ab-partner__item {
  position: relative;
  padding: 22px 22px 24px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .ab-partner__item:hover {
  border-color: var(--flame);
  transform: translateY(-3px);
}

.page-about .ab-partner__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .ab-partner__item h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper-hi);
  letter-spacing: -0.01em;
}

.page-about .ab-partner__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ab-muted);
}

@media (min-width: 820px) {
  .page-about .ab-partner {
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
  }
  .page-about .ab-partner__item:nth-child(2) {
    margin-top: 24px;
  }
}

/* ---------- 备案与联络 ---------- */
.page-about .ab-tail__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .ab-tail__main h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper-hi);
  margin: 14px 0 16px;
  max-width: 18ch;
}

.page-about .ab-tail__main p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ab-text);
  max-width: 50ch;
}

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

.page-about .ab-tail__legal {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-tail__legal dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ab-muted);
  padding: 16px 0 4px;
}

.page-about .ab-tail__legal dd {
  margin: 0;
  padding-bottom: 14px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--paper-hi);
  border-bottom: 1px solid var(--line);
  word-break: break-word;
}

.page-about .ab-tail__legal dt:first-of-type {
  padding-top: 18px;
}

@media (min-width: 880px) {
  .page-about .ab-tail__grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: clamp(32px, 5vw, 80px);
    align-items: start;
  }
  .page-about .ab-tail__legal {
    border-top: 0;
  }
  .page-about .ab-tail__legal dt:first-of-type {
    padding-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-axis__rail::before,
  .page-about .ab-axis__txt,
  .page-about .ab-bar__fill,
  .page-about .ab-partner__item,
  .page-about .ab-index a {
    transition: none;
  }
  .page-about .ab-partner__item:hover {
    transform: none;
  }
}