.page-about {
  background: var(--ink);
  color: var(--warm);
  font-family: var(--font-display);
  overflow-x: hidden;
}

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

.page-about .breadcrumbs {
  padding-top: clamp(14px, 2.4vw, 26px);
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
}

.page-about .breadcrumbs a,
.page-about .breadcrumbs__item {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  color: var(--focus);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .breadcrumbs__current {
  color: var(--warm);
}

.page-about .breadcrumbs__current::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(26px, 5vw, 56px) 0 clamp(34px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 20ch;
  font-size: clamp(2.05rem, 7.2vw, 4.8rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--warm);
}

.page-about .about-hero__title span {
  display: block;
  width: fit-content;
  max-width: 100%;
  margin-top: .12em;
  padding-bottom: .06em;
  color: var(--pale);
  border-bottom: 6px solid var(--amber);
}

.page-about .about-hero__lede {
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  max-width: 64ch;
  font-size: clamp(1rem, 1.7vw, 1.12rem);
  line-height: 1.9;
  color: var(--cyan);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-fact {
  padding: 2px 0 2px 14px;
  border-left: 2px solid var(--amber);
}

.page-about .hero-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .hero-fact__num small {
  font-size: .48em;
  letter-spacing: .04em;
  margin-left: 3px;
}

.page-about .hero-fact__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapters {
  padding-bottom: clamp(40px, 7vw, 90px);
}

.page-about .chapter {
  display: grid;
  gap: clamp(16px, 3vw, 28px);
  padding: clamp(34px, 6vw, 72px) 0;
  border-top: 1px solid var(--line);
}

.page-about .chapter:first-child {
  border-top: 0;
}

.page-about .chapter__rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--amber);
}

.page-about .chapter__name {
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--cyan);
}

.page-about .chapter__tick {
  flex: 1;
  height: 1px;
  background: var(--line);
}

.page-about .chapter__body {
  min-width: 0;
}

.page-about .chapter__body .section-title {
  margin: 0 0 14px;
  font-size: clamp(1.5rem, 4.2vw, 2.6rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--warm);
}

.page-about .chapter__lede {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 66ch;
  font-size: clamp(.96rem, 1.6vw, 1.06rem);
  line-height: 1.9;
  color: var(--cyan);
}

.page-about .media-frame {
  margin: 0 0 clamp(22px, 3vw, 32px);
  border: 1px solid var(--line);
  background: rgba(15, 45, 70, .55);
}

.page-about .media-frame__caption {
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.7;
  color: var(--cyan);
}

/* ---------- 时间轴 ---------- */

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

.page-about .tl__item {
  position: relative;
  padding: 0 0 24px 26px;
  border-left: 1px solid var(--line-strong);
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: .55em;
  width: 9px;
  height: 9px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--amber);
}

.page-about .tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--amber);
}

.page-about .tl__title {
  margin: 6px 0 6px;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--warm);
}

.page-about .tl__text {
  margin: 0;
  font-size: .94rem;
  line-height: 1.85;
  color: var(--cyan);
}

/* ---------- 团队网格 ---------- */

.page-about .crew {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .crew__card {
  padding: clamp(16px, 2.6vw, 22px);
  background: linear-gradient(158deg, rgba(15, 45, 70, .95), rgba(8, 24, 38, .92));
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  border-radius: 3px;
}

.page-about .crew__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .crew__role {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--warm);
}

.page-about .crew__count {
  font-family: var(--font-mono);
  font-size: 1.32rem;
  font-weight: 700;
  color: var(--pale);
  line-height: 1;
}

.page-about .crew__count small {
  margin-left: 2px;
  font-size: .5em;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .crew__text {
  margin: 10px 0 0;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--cyan);
}

.page-about .flow-note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: clamp(16px, 2.4vw, 24px);
  background: rgba(15, 45, 70, .6);
  border-left: 3px solid var(--amber);
  font-size: .95rem;
  line-height: 1.9;
  color: var(--pale);
}

/* ---------- 校验步骤牌 ---------- */

.page-about .steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .step {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--paper);
  color: var(--brown);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .step__idx {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 8px;
  background: var(--pale);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--brown);
}

.page-about .step__title {
  margin: 0 0 8px;
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--brown);
}

.page-about .step__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: rgba(36, 28, 23, .82);
}

/* ---------- 服务覆盖 ---------- */

.page-about .figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 clamp(24px, 3.4vw, 34px);
  padding: 0;
  list-style: none;
}

.page-about .figure {
  padding: 14px 12px;
  background: rgba(15, 45, 70, .45);
  border-top: 2px solid var(--amber);
}

.page-about .figure__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .figure__num small {
  margin-left: 2px;
  font-size: .48em;
  letter-spacing: .04em;
}

.page-about .figure__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--cyan);
}

.page-about .scenes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .scene {
  padding-left: 16px;
  border-left: 1px solid var(--line-strong);
}

.page-about .scene__who {
  display: block;
  margin-bottom: 6px;
  font-size: .98rem;
  font-weight: 700;
  color: var(--warm);
}

.page-about .scene__text {
  margin: 0;
  font-size: .93rem;
  line-height: 1.82;
  color: var(--cyan);
}

.page-about .honor {
  margin: clamp(22px, 3vw, 30px) 0 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--cyan);
}

/* ---------- 运营地与联系 ---------- */

.page-about .plates {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
}

.page-about .plate {
  padding: clamp(16px, 2.4vw, 22px);
  background: rgba(15, 45, 70, .55);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: 3px;
}

.page-about .plate--wide {
  border-left-color: var(--amber);
}

.page-about .plate__label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .plate__value {
  margin: 0;
  font-size: .98rem;
  line-height: 1.75;
  color: var(--warm);
  overflow-wrap: break-word;
  word-break: break-word;
}

.page-about .go-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(24px, 3.4vw, 34px);
}

/* ---------- 断点 ---------- */

@media (min-width: 620px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 640px) {
  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 22px;
  }

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

  .page-about .plate--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .chapter {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .chapter__rail {
    position: sticky;
    top: 28px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding-left: 16px;
    border-left: 1px solid var(--line-strong);
  }

  .page-about .chapter__num {
    font-size: 2.4rem;
    line-height: 1;
  }

  .page-about .chapter__name {
    writing-mode: vertical-rl;
    letter-spacing: .32em;
  }

  .page-about .chapter__tick {
    display: none;
  }

  .page-about .about-hero__title {
    max-width: 22ch;
  }
}

@media (min-width: 1080px) {
  .page-about .crew {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter,
  .page-about .chapter__rail {
    scroll-behavior: auto;
  }
}