.page-about {
  --about-rule: rgba(14, 42, 69, .16);
  --about-gap: clamp(52px, 9vw, 104px);
  background: var(--paper);
  color: var(--ink);
  padding-bottom: calc(var(--bottom-bar-h) + clamp(40px, 7vw, 72px));
  overflow-x: hidden;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-weight: 600;
}

.page-about .breadcrumb {
  padding-top: calc(var(--header-h) + 18px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(22px, 4vw, 38px);
  padding-top: clamp(22px, 4vw, 40px);
  padding-bottom: clamp(40px, 7vw, 76px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 7.4vw, 4.2rem);
  line-height: 1.12;
  letter-spacing: -.015em;
  margin: 14px 0 18px;
  color: var(--ink);
}

.page-about .about-hero__lead {
  max-width: 46ch;
  margin: 0;
  font-size: 1.06rem;
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .about-hero__art {
  margin: 0;
  position: relative;
}

.page-about .about-hero__art img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 6%, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-hero__caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--about-rule);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  font-size: .9rem;
  color: var(--muted);
}

.page-about .about-hero__facts .mono {
  font-size: 1.2rem;
  color: var(--ink);
  margin-right: 6px;
}

.page-about .about-hero__slash {
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(200px, 34%);
  height: 3px;
  background: linear-gradient(90deg, var(--orange), var(--fold));
  transform: rotate(-12deg);
  transform-origin: right center;
}

/* ---------- 分区通用 ---------- */
.page-about .about-section {
  padding-top: var(--about-gap);
}

.page-about .about-section .section__head {
  max-width: 60ch;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-section .section__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4.4vw, 2.6rem);
  line-height: 1.2;
  margin: 10px 0 12px;
  color: var(--ink);
}

.page-about .about-section .section__lead {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 版本时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 26px;
  border-left: 1px solid var(--about-rule);
  display: grid;
  gap: 32px;
}

.page-about .timeline__item {
  position: relative;
  outline: none;
}

.page-about .timeline__dot {
  position: absolute;
  left: -33px;
  top: 7px;
  width: 13px;
  height: 13px;
  background: var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 26% 100%);
}

.page-about .timeline__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .timeline__head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--ink);
}

.page-about .timeline__item p {
  margin: 0 0 6px;
  max-width: 60ch;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .timeline__item p.timeline__more {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: .95rem;
  color: var(--cyan-deep);
  transition: max-height .24s var(--ease), opacity .24s var(--ease);
}

.page-about .timeline__item:hover p.timeline__more,
.page-about .timeline__item:focus-within p.timeline__more,
.page-about .timeline__item:focus p.timeline__more {
  max-height: 140px;
  opacity: 1;
}

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

/* ---------- 新旧编号对照 ---------- */
.page-about .compare {
  margin-top: clamp(30px, 5vw, 52px);
  background: var(--paper-lift);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .compare__summary {
  cursor: pointer;
  padding: 18px clamp(16px, 3vw, 28px);
  font-family: var(--font-mono);
  font-size: .88rem;
  letter-spacing: .06em;
  color: var(--orange-deep);
}

.page-about .compare__grid {
  display: grid;
  gap: 20px;
  padding: 0 clamp(16px, 3vw, 28px) 26px;
}

.page-about .compare__col {
  border-left: 2px solid var(--about-rule);
  padding: 4px 0 4px 16px;
}

.page-about .compare__col--old {
  border-left-color: var(--muted);
}

.page-about .compare__col--new {
  border-left-color: var(--cyan);
}

.page-about .compare__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .compare__path {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--ink);
}

.page-about .compare__col--new .compare__path {
  display: inline-block;
  padding: 2px 12px;
  background: rgba(0, 227, 200, .22);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%);
}

.page-about .compare__note {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 每天四件事 ---------- */
.page-about .daily {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--about-rule);
}

.page-about .daily__item {
  display: grid;
  gap: 8px;
  padding: 24px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .daily__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--orange);
}

.page-about .daily__item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--ink);
}

.page-about .daily__item p {
  margin: 0;
  max-width: 62ch;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .daily__item .daily__time {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .05em;
  color: var(--cyan-deep);
}

/* ---------- 团队 ---------- */
.page-about .team-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .team-roles__item {
  background: var(--paper-lift);
  border-left: 3px solid var(--orange);
  padding: 22px 20px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  outline: none;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .team-roles__item:hover,
.page-about .team-roles__item:focus-within {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(14, 42, 69, .1);
}

.page-about .team-roles__item:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .team-roles__item h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--ink);
}

.page-about .team-roles__item p {
  margin: 0 0 10px;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .team-roles__item .team-roles__shift {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-team__art {
  margin: clamp(28px, 5vw, 48px) 0 0;
}

.page-about .about-team__art img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 3.5%, 100% 100%, 0 100%);
}

/* ---------- 覆盖与适配 ---------- */
.page-about .about-reach__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

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

.page-about .about-reach__art img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 3%, 100% 0, 100% 100%, 0 97%);
}

.page-about .about-reach__body .section__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4.4vw, 2.6rem);
  line-height: 1.2;
  margin: 10px 0 14px;
  color: var(--ink);
}

.page-about .about-reach__body > p {
  margin: 0;
  max-width: 54ch;
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .reach-stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--about-rule);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.page-about .reach-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  color: var(--orange-deep);
}

.page-about .reach-stats__label {
  display: block;
  margin-top: 6px;
  font-size: .88rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 协作与资质 ---------- */
.page-about .partners {
  display: grid;
  gap: 18px;
}

.page-about .partners__card {
  position: relative;
  background: var(--paper-lift);
  padding: 30px 24px 26px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .partners__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 54px;
  height: 4px;
  background: var(--orange);
}

.page-about .partners__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--ink);
}

.page-about .partners__card p {
  margin: 0;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-cta {
  margin-top: clamp(32px, 5vw, 56px);
  padding: clamp(26px, 4vw, 42px);
  background: var(--ink);
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  display: grid;
  gap: 22px;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 1.04rem;
  line-height: 1.9;
  color: rgba(246, 239, 228, .88);
}

.page-about .about-cta__text a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-cta__text a:hover,
.page-about .about-cta__text a:focus-visible {
  color: var(--paper-lift);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .compare__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }

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

@media (min-width: 860px) {
  .page-about .daily {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 5vw, 64px);
  }

  .page-about .team-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
    column-gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-hero__text {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-hero__art {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .page-about .about-hero__facts {
    grid-column: 1;
    grid-row: 2;
    align-self: end;
  }

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
    column-gap: clamp(34px, 5vw, 68px);
  }

  .page-about .timeline {
    padding-left: 34px;
  }

  .page-about .timeline__dot {
    left: -41px;
  }
}