.page-about {
  --about-line: var(--line);
  --about-block: clamp(28px, 5vw, 64px);
}

/* ---------- 面包屑条 ---------- */
.page-about .crumb-bar {
  padding-block: clamp(16px, 2.5vw, 26px) 0;
}

/* ---------- 首屏 ---------- */
.page-about .hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(28px, 5vw, 56px) clamp(36px, 6vw, 72px);
}

.page-about .hero__slab {
  position: absolute;
  top: -50px;
  right: -70px;
  left: auto;
  width: 250px;
  height: 250px;
  background: linear-gradient(150deg, var(--zhu) 0%, #93241e 100%);
  clip-path: polygon(32% 0, 100% 0, 100% 68%, 0 100%);
  z-index: 0;
}

.page-about .hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  align-items: center;
}

.page-about .hero__copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(38px, 8.5vw, 62px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .hero__lead {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .hero__fig {
  margin: 0;
}

.page-about .hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: var(--shadow-1);
}

.page-about .hero__cap {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .hero__facts {
  list-style: none;
  margin: clamp(32px, 6vw, 64px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  border-top: 1px solid var(--line);
  padding-top: clamp(20px, 3vw, 32px);
}

.page-about .fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .fact__num {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 4.6vw, 38px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--zhu);
}

.page-about .fact__label {
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 通用章节头 ---------- */
.page-about .sec-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .sec-head--compact {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .sec-head h2 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .sec-head__lead {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 发展脉络 ---------- */
.page-about .origin__fig {
  margin: 0 0 clamp(32px, 5vw, 56px);
}

.page-about .origin__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: var(--shadow-1);
}

.page-about .origin__cap {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .timeline {
  --tl-pad: clamp(26px, 5vw, 52px);
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--tl-pad);
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--zhu) 35%, var(--line) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-block: clamp(16px, 2.6vw, 26px);
  border-bottom: 1px solid var(--line);
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-pad) * -1 + 3px);
  top: calc(clamp(16px, 2.6vw, 26px) + 0.62em);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--zhu);
  transform: translate(-50%, -50%);
}

.page-about .tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--zhu);
}

.page-about .tl__title {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 22px);
  line-height: 1.35;
  color: var(--text);
}

.page-about .tl__body p {
  margin: 10px 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 三条主张 ---------- */
.page-about .band--zhu {
  background: linear-gradient(168deg, var(--zhu) 0%, #9d2822 62%, #7f1f1a 100%);
  color: var(--paper);
}

.page-about .sec-head--on-zhu h2 {
  color: var(--paper);
}

.page-about .sec-head--on-zhu .sec-head__lead {
  color: rgba(247, 244, 238, 0.82);
}

.page-about .sec-head--on-zhu .eyebrow {
  color: rgba(247, 244, 238, 0.72);
}

.page-about .sec-head--on-zhu .eyebrow__num {
  color: var(--gold);
}

.page-about .principles {
  display: grid;
  gap: clamp(16px, 3vw, 26px);
}

.page-about .prin {
  position: relative;
  padding: clamp(22px, 3.2vw, 32px);
  background: rgba(247, 244, 238, 0.07);
  border: 1px solid rgba(247, 244, 238, 0.22);
  border-radius: 4px;
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease), background 180ms var(--ease);
}

.page-about .prin:hover {
  transform: translateY(-3px);
  background: rgba(247, 244, 238, 0.11);
  box-shadow: 0 18px 38px -24px rgba(8, 21, 38, 0.9);
}

.page-about .prin:focus {
  outline: none;
}

.page-about .prin:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}

.page-about .prin__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
  border-bottom: 1px solid rgba(200, 161, 90, 0.55);
  padding-bottom: 4px;
}

.page-about .prin__title {
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 2.8vw, 26px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .prin__text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(247, 244, 238, 0.84);
}

.page-about .prin__stat {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(247, 244, 238, 0.24);
  font-size: 14px;
  line-height: 1.6;
  color: rgba(247, 244, 238, 0.72);
}

.page-about .prin__stat strong {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

/* ---------- 团队分工 ---------- */
.page-about .team__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .team__cells {
  display: grid;
  gap: 14px;
}

.page-about .cell {
  position: relative;
  padding: clamp(18px, 2.6vw, 24px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: 4px;
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease), border-left-color 180ms var(--ease);
}

.page-about .cell:hover,
.page-about .cell:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-left-color: var(--zhu);
}

.page-about .cell:focus {
  outline: none;
}

.page-about .cell:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-about .cell__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: 0.06em;
  color: var(--zhu);
}

.page-about .cell__title {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.35;
  color: var(--text);
}

.page-about .cell__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .team__fig {
  margin: 0;
}

.page-about .team__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: var(--shadow-1);
}

.page-about .team__aside .note {
  margin-top: 18px;
}

/* ---------- 协作生态 ---------- */
.page-about .partners {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .partner {
  padding: clamp(22px, 3vw, 30px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 4px;
  border-top: 3px solid var(--ink);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease), border-top-color 180ms var(--ease);
}

.page-about .partner:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-top-color: var(--zhu);
}

.page-about .partner__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .partner__title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .partner__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--muted);
}

.page-about .partner__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .partner__list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .partner__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--gold);
}

/* ---------- 客户留存 ---------- */
.page-about .keep {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .keep__ring {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

.page-about .ring {
  position: relative;
  width: clamp(150px, 42vw, 196px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: conic-gradient(var(--zhu) 0% 87%, var(--line) 87% 100%);
  display: grid;
  place-items: center;
}

.page-about .ring__hole {
  position: absolute;
  inset: 14px;
  border-radius: 50%;
  background: var(--paper);
}

.page-about .ring__val {
  position: relative;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(34px, 9vw, 48px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.page-about .ring__unit {
  font-size: 0.45em;
  margin-left: 2px;
  color: var(--zhu);
}

.page-about .keep__ringcap {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

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

.page-about .kstat {
  display: grid;
  gap: 6px;
  padding-block: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .kstat__num {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 3vw, 26px);
  letter-spacing: -0.01em;
  color: var(--zhu);
}

.page-about .kstat__label {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .keep__story {
  margin-top: clamp(20px, 3vw, 28px);
  padding: clamp(20px, 3vw, 26px);
  background: var(--zhu-pale);
  border-left: 3px solid var(--zhu);
  border-radius: 4px;
}

.page-about .keep__story p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text);
}

/* ---------- 结尾行动区 ---------- */
.page-about .cta {
  background: linear-gradient(160deg, var(--ink) 0%, var(--ink-deep) 100%);
  color: var(--paper);
}

.page-about .cta__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .eyebrow--on-ink {
  color: rgba(201, 211, 222, 0.8);
}

.page-about .eyebrow--on-ink .eyebrow__num {
  color: var(--gold);
}

.page-about .cta h2 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .cta__text {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--on-ink);
}

.page-about .cta__actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

.page-about .cta__btn-a,
.page-about .cta__btn-b {
  width: 100%;
  text-align: center;
}

.page-about .cta__btn-a {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}

.page-about .cta__btn-a:hover {
  background: var(--zhu-pale);
  border-color: var(--zhu-pale);
}

.page-about .cta__btn-b {
  background: transparent;
  color: var(--paper);
  border-color: rgba(247, 244, 238, 0.45);
}

.page-about .cta__btn-b:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.page-about .cta__link {
  font-size: 14px;
  line-height: 1.6;
  color: var(--on-ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 211, 222, 0.4);
  padding-bottom: 2px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .cta__link:hover {
  color: var(--gold);
  border-color: var(--gold);
}

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

  .page-about .team__cells {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .cta__actions {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 18px;
  }

  .page-about .cta__btn-a,
  .page-about .cta__btn-b {
    width: auto;
  }

  .page-about .cta__link {
    flex-basis: 100%;
  }
}

@media (min-width: 900px) {
  .page-about .hero__slab {
    top: 0;
    right: 0;
    width: min(56%, 760px);
    height: 86%;
    clip-path: polygon(16% 0, 100% 0, 100% 100%, 0 78%);
  }

  .page-about .hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .tl__item {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(20px, 3.5vw, 48px);
    margin-left: clamp(0px, 4vw, 72px);
  }

  .page-about .tl__year {
    padding-top: 4px;
  }

  .page-about .tl__title {
    margin-top: 0;
  }

  .page-about .principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: clamp(18px, 2.6vw, 30px);
  }

  .page-about .prin:nth-child(2) {
    margin-top: clamp(28px, 5vw, 64px);
  }

  .page-about .prin:nth-child(3) {
    margin-top: clamp(12px, 2.4vw, 30px);
  }

  .page-about .team__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.8fr);
    align-items: start;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .keep {
    grid-template-columns: minmax(0, 0.42fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .keep__ring {
    padding-top: 6px;
  }

  .page-about .cta__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.8fr);
    align-items: center;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .cta__actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-about .cta__btn-a,
  .page-about .cta__btn-b {
    width: 100%;
    max-width: 320px;
  }
}

@media (min-width: 1200px) {
  .page-about .hero__copy h1 {
    font-size: 62px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .prin,
  .page-about .cell,
  .page-about .partner,
  .page-about .cta__link {
    transition: none;
  }

  .page-about .prin:hover,
  .page-about .cell:hover,
  .page-about .partner:hover {
    transform: none;
  }
}