.page-about {
  --ab-line: rgba(198, 161, 91, .42);
  --ab-hair: rgba(20, 33, 30, .12);
  --ab-tint: #F1EADC;
  --ab-pad: clamp(40px, 6vw, 88px);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  background:
    radial-gradient(120% 95% at 100% 0%, #1C5145 0%, #0D2B24 56%, #0A211C 100%);
  color: var(--paper);
  padding: clamp(22px, 3vw, 36px) 0 clamp(48px, 7vw, 92px);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-500), transparent);
  opacity: .55;
}

.page-about .ab-hero .crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 48px);
  padding: 0;
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--mist-200);
}

.page-about .ab-hero .crumbs a {
  color: var(--gold-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

.page-about .ab-hero .crumbs a:hover {
  color: var(--amber-400);
  border-bottom-color: var(--amber-400);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .ab-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(2.05rem, 4.6vw, 3.5rem);
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--paper);
  max-width: 15em;
}

.page-about .ab-hero__lede {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.1vw, 1.05rem);
  line-height: 1.9;
  color: #DDE5E1;
}

.page-about .ab-facts {
  padding: 12px 18px 8px;
  border: 1px solid rgba(198, 161, 91, .38);
  background: rgba(18, 59, 58, .55);
  border-radius: 2px;
  align-self: end;
}

.page-about .ab-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(199, 211, 206, .16);
}

.page-about .ab-facts__row:last-child {
  border-bottom: 0;
}

.page-about .ab-facts__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.32rem;
  letter-spacing: -.01em;
  color: var(--amber-400);
  white-space: nowrap;
}

.page-about .ab-facts__num small {
  font-size: .58em;
  font-weight: 500;
  margin-left: 2px;
  color: var(--gold-500);
}

.page-about .ab-facts__label {
  font-size: .84rem;
  line-height: 1.5;
  color: var(--mist-200);
  text-align: right;
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-sec {
  position: relative;
  padding: var(--ab-pad) 0;
}

.page-about .ab-sec--aud {
  background: var(--ab-tint);
}

.page-about .ab-sec--join {
  background: linear-gradient(180deg, var(--paper) 0%, #EFE8D9 100%);
  border-top: 1px solid var(--ab-hair);
}

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

.page-about .ab-sec__head .big-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.2rem, 5.5vw, 3.8rem);
  line-height: 1;
  letter-spacing: -.02em;
  margin-bottom: 12px;
  color: rgba(198, 161, 91, .3);
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .ab-sec__head .big-num {
    color: transparent;
    -webkit-text-stroke: 1px var(--gold-500);
  }
}

.page-about .ab-sec__head h2 {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--green-900);
  max-width: 20em;
}

.page-about .ab-sec__head p {
  margin: 0;
  max-width: 44em;
  font-size: .98rem;
  line-height: 1.9;
  color: var(--ink-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-story__fig {
  margin: 0 0 clamp(30px, 4.5vw, 52px);
  position: relative;
}

.page-about .ab-story__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 2px;
  border: 1px solid var(--ab-hair);
}

.page-about .ab-story__fig .media__caption {
  display: block;
  margin-top: 10px;
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--ink-soft);
}

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

.page-about .ab-track__item {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  column-gap: 18px;
  padding-bottom: 30px;
}

.page-about .ab-track__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.35rem;
  line-height: 1;
  padding-top: 7px;
  text-align: right;
  color: var(--gold-500);
  white-space: nowrap;
}

.page-about .ab-track__body {
  position: relative;
  padding-left: 24px;
  padding-bottom: 6px;
  border-left: 1px solid var(--ab-line);
}

.page-about .ab-track__body::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 10px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold-500);
  box-shadow: 0 0 0 4px rgba(198, 161, 91, .16);
}

.page-about .ab-track__item--now .ab-track__body::before {
  background: var(--amber-400);
  box-shadow: 0 0 0 5px rgba(227, 168, 59, .22);
}

.page-about .ab-track__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.08rem;
  line-height: 1.5;
  color: var(--green-900);
}

.page-about .ab-track__body p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 三类人 ---------- */
.page-about .ab-aud {
  border-top: 1px solid var(--stone-300);
}

.page-about .ab-aud__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 24px 0;
  border-bottom: 1px solid var(--stone-300);
}

.page-about .ab-aud__idx {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .82rem;
  letter-spacing: .18em;
  color: var(--gold-500);
}

.page-about .ab-aud__row h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.14rem;
  line-height: 1.45;
  color: var(--green-900);
}

.page-about .ab-aud__row p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.9;
  color: var(--ink-soft);
}

/* ---------- 四步方法 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-step {
  position: relative;
  padding: 26px 0 26px 26px;
  border-left: 1px solid var(--ab-line);
}

.page-about .ab-step::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 32px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold-500);
}

.page-about .ab-step--now::before {
  background: var(--amber-400);
  box-shadow: 0 0 0 5px rgba(227, 168, 59, .22);
}

.page-about .ab-step__n {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .8rem;
  letter-spacing: .18em;
  color: var(--gold-500);
  margin-bottom: 6px;
}

.page-about .ab-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.04rem;
  color: var(--green-900);
}

.page-about .ab-step p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 团队与运营 ---------- */
.page-about .ab-ops__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .ab-ops__panel {
  position: relative;
  overflow: hidden;
  background: var(--green-900);
  color: var(--paper);
  border-radius: 2px;
}

.page-about .ab-ops__tex {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .2;
}

.page-about .ab-ops__panel-in {
  position: relative;
  padding: clamp(24px, 4vw, 40px);
}

.page-about .ab-ops__panel-in h2 {
  margin: 10px 0 12px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.45rem, 2.8vw, 2.1rem);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .ab-ops__panel-lede {
  margin: 0;
  font-size: .94rem;
  line-height: 1.85;
  color: #D6E0DC;
  max-width: 34em;
}

.page-about .ab-ops__stats {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .ab-ops__stats li {
  padding-top: 14px;
  border-top: 1px solid rgba(198, 161, 91, .3);
}

.page-about .ab-ops__stats strong {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.9rem;
  line-height: 1;
  color: var(--amber-400);
}

.page-about .ab-ops__stats span {
  display: block;
  margin-top: 8px;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--mist-200);
}

.page-about .ab-ops__side h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--green-900);
}

.page-about .ab-ops__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-ops__list li {
  position: relative;
  padding-left: 18px;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .ab-ops__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold-500);
}

.page-about .ab-ops__list strong {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--green-900);
  margin-right: 6px;
}

.page-about .ab-ops__addr {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ab-hair);
  font-size: .84rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 资质与合作 ---------- */
.page-about .ab-cred__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .ab-badges {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-badge {
  border: 1px solid rgba(198, 161, 91, .55);
  background: var(--white);
  padding: 14px 16px;
  transition: border-color .3s var(--ease), transform .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .ab-badge:hover,
.page-about .ab-badge:focus-within,
.page-about .ab-badge:focus {
  border-color: var(--amber-400);
  transform: translateY(-2px);
  box-shadow: var(--shadow-1);
  outline: none;
}

.page-about .ab-badge__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .ab-badge__top span {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: .98rem;
  line-height: 1.5;
  color: var(--green-900);
}

.page-about .ab-badge__year {
  flex: none;
  font-family: var(--font-mono);
  font-style: normal;
  font-weight: 600;
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--wine-700);
  border: 1px solid rgba(116, 51, 58, .35);
  padding: 2px 8px;
  white-space: nowrap;
}

.page-about .ab-badge__desc {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .38s var(--ease);
}

.page-about .ab-badge__desc > span {
  display: block;
  min-height: 0;
  overflow: hidden;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

.page-about .ab-eco {
  margin-top: 26px;
  padding: 20px 0 0;
  border-top: 1px solid var(--ab-hair);
}

.page-about .ab-eco h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1rem;
  color: var(--green-900);
}

.page-about .ab-eco p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.page-about .ab-cred__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ab-hair);
  border-radius: 2px;
}

.page-about .ab-cred__fig .media__caption {
  display: block;
  margin-top: 10px;
  font-size: .78rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 加入与合作 ---------- */
.page-about .ab-join__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .ab-join__copy .big-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.2rem, 5.5vw, 3.8rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: rgba(198, 161, 91, .3);
  margin-bottom: 12px;
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .ab-join__copy .big-num {
    color: transparent;
    -webkit-text-stroke: 1px var(--gold-500);
  }
}

.page-about .ab-join__copy h2 {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.55rem, 3vw, 2.3rem);
  line-height: 1.28;
  color: var(--green-900);
  max-width: 18em;
}

.page-about .ab-join__copy p {
  margin: 0 0 12px;
  max-width: 40em;
  font-size: .96rem;
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .ab-join__copy a {
  color: var(--green-700);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-500);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .ab-join__copy a:hover {
  color: var(--wine-700);
  border-bottom-color: var(--wine-700);
}

.page-about .ab-join__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .ab-join__card {
  background: var(--white);
  border: 1px solid var(--stone-300);
  padding: clamp(20px, 3vw, 28px);
  border-radius: 2px;
}

.page-about .ab-join__card h3 {
  margin: 0 0 14px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: .04em;
  color: var(--green-900);
}

.page-about .ab-join__card .contact-line {
  display: grid;
  gap: 4px;
  margin: 0 0 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .ab-join__card .contact-line:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .ab-join__card .contact-line__label {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--gold-500);
}

.page-about .ab-join__card .contact-line__value {
  font-size: .93rem;
  line-height: 1.7;
  color: var(--ink);
  word-break: break-word;
}

.page-about .ab-join__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--stone-300);
  font-size: .82rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .ab-aud__row {
    grid-template-columns: 56px minmax(0, .85fr) minmax(0, 1.4fr);
    column-gap: clamp(20px, 3vw, 40px);
    align-items: start;
    padding: 30px 0;
  }

  .page-about .ab-ops__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .ab-track__item {
    grid-template-columns: 92px minmax(0, 1fr);
    column-gap: 26px;
  }

  .page-about .ab-track__year {
    font-size: 1.6rem;
  }
}

@media (min-width: 900px) {
  .page-about .ab-ops__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .ab-cred__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .ab-join__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: clamp(18px, 2.5vw, 34px);
  }

  .page-about .ab-step {
    border-left: 0;
    padding: 34px 0 0;
  }

  .page-about .ab-step::before {
    top: 5px;
    left: 0;
    width: 9px;
    height: 9px;
  }

  .page-about .ab-step::after {
    content: "";
    position: absolute;
    top: 9px;
    left: 9px;
    right: 0;
    height: 1px;
    background: var(--ab-line);
  }

  .page-about .ab-step:last-child::after {
    display: none;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero h1 {
    max-width: 13em;
  }

  .page-about .ab-facts {
    padding: 16px 22px 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-badge,
  .page-about .ab-badge__desc,
  .page-about .ab-hero .crumbs a,
  .page-about .ab-join__copy a {
    transition: none;
  }

  .page-about .ab-badge:hover,
  .page-about .ab-badge:focus-within,
  .page-about .ab-badge:focus {
    transform: none;
  }
}
</