.page-about {
  --ab-rail-w: 138px;
  --ab-stage-border: rgba(42, 33, 24, 0.18);
  color: var(--ink);
  background: var(--mist);
}

/* ============ 面包屑 ============ */
.page-about .breadcrumb {
  padding: 18px 0 4px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

.page-about .breadcrumb a {
  color: var(--blue);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  text-decoration: underline;
}

.page-about .breadcrumb span[aria-hidden] {
  margin: 0 8px;
  color: var(--line);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: clamp(16px, 3vw, 34px) 0 clamp(44px, 7vw, 84px);
  background:
    radial-gradient(115% 85% at 90% 4%, rgba(11, 95, 255, 0.12), transparent 62%),
    linear-gradient(180deg, #ffffff 0%, var(--mist) 100%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.page-about .index-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(32px, 6.4vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 42ch;
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.85;
  color: var(--graphite);
}

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

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 32px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-left: 14px;
  border-left: 2px solid var(--blue-pale);
}

.page-about .about-facts .mono {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--blue);
}

.page-about .about-facts em {
  font-style: normal;
  font-size: 13px;
  color: var(--graphite);
}

.page-about .about-hero__visual {
  padding: clamp(18px, 3vw, 30px);
  border-radius: var(--r-lg);
  background: linear-gradient(155deg, var(--ink) 0%, var(--ink-2) 58%, var(--blue-deep) 150%);
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__visual svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ============ 通用段落节奏 ============ */
.page-about .section {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .about-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-head h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 700;
}

.page-about .about-head__sub {
  margin: 14px 0 0;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--graphite);
}

/* ============ 我们做什么 ============ */
.page-about .about-work__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-work__lead {
  margin: 0;
  max-width: 38ch;
  font-size: clamp(17px, 2vw, 19px);
  line-height: 1.85;
  color: var(--ink);
  padding-left: 18px;
  border-left: 3px solid var(--blue);
}

.page-about .about-work__list {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-work__list li {
  padding: 20px 22px;
  border-radius: var(--r-md);
  background: #ffffff;
  border: 1px solid var(--line);
}

.page-about .about-work__list h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
}

.page-about .about-work__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite);
}

/* ============ 时间轴 ============ */
.page-about .about-history {
  background: #ffffff;
}

.page-about .about-history__figure {
  margin: 0 0 clamp(28px, 5vw, 46px);
}

.page-about .figure-frame__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-md);
  object-fit: cover;
  background: var(--blue-pale);
}

.page-about .figure-frame__cap {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--graphite);
}

.page-about .timeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .timeline__rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 0 10px;
}

.page-about .rail-tick {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 14px;
  border-radius: var(--pill);
  background: var(--mist);
  border: 1px solid var(--line);
  color: var(--graphite);
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .rail-tick__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line);
  transition: background 0.18s var(--ease);
}

.page-about .rail-tick__year {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.page-about .rail-tick:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.page-about .rail-tick.is-active {
  background: var(--blue);
  border-color: var(--blue);
  color: #ffffff;
}

.page-about .rail-tick.is-active .rail-tick__dot {
  background: var(--orange);
}

.page-about .timeline__stages {
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .about-stage {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--r-md);
  border: 1px solid var(--ab-stage-border);
  background: var(--paper);
  scroll-margin-top: 110px;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-stage:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.page-about .about-stage__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin: 0 0 14px;
}

.page-about .about-stage__year {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--brown);
}

.page-about .about-stage__title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.2vw, 21px);
  line-height: 1.45;
  font-weight: 700;
  color: var(--brown);
}

.page-about .about-stage__text {
  margin: 0;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.85;
  color: #4a3f33;
}

/* ============ 流程 ============ */
.page-about .about-process__figure {
  margin: 0 0 clamp(26px, 4vw, 42px);
  max-width: 620px;
}

.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  padding: clamp(20px, 3vw, 28px) 0;
  border-top: 1px solid var(--line);
  transition: border-color 0.2s var(--ease);
}

.page-about .about-step:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--blue);
  transition: color 0.2s var(--ease);
}

.page-about .about-step:hover {
  border-top-color: var(--blue);
}

.page-about .about-step:hover .about-step__num {
  color: var(--orange);
}

.page-about .about-step__body h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .about-step__body p {
  margin: 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite);
}

/* ============ 供稿生态 ============ */
.page-about .about-partners {
  background: #ffffff;
}

.page-about .about-partners__lead {
  margin: 0 0 clamp(24px, 4vw, 36px);
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--graphite);
}

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

.page-about .about-partner {
  padding: 24px 22px 26px;
  border-radius: var(--r-md);
  background: var(--blue-pale);
  border-top: 3px solid var(--blue);
  transition: transform 0.2s var(--ease);
}

.page-about .about-partner:hover {
  transform: translateY(-2px);
}

.page-about .about-partner h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--blue-deep);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-partners__cta {
  margin: 26px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite);
}

.page-about .about-partners__cta a {
  color: var(--blue);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--blue-pale);
}

.page-about .about-partners__cta a:hover {
  border-bottom-color: var(--blue);
}

/* ============ 团队与所在地 ============ */
.page-about .about-team__plate {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--ab-stage-border);
  background: var(--paper);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--blue-pale);
}

.page-about .about-team__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 40px);
  padding: clamp(22px, 4vw, 38px);
}

.page-about .about-team__roles {
  display: grid;
  gap: 16px;
}

.page-about .role-card {
  padding: 18px 20px;
  border-radius: var(--r-sm);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--ab-stage-border);
  transition: transform 0.2s var(--ease);
}

.page-about .role-card:hover {
  transform: translateY(-2px);
}

.page-about .role-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 500;
  line-height: 1;
  color: var(--orange);
}

.page-about .role-card h3 {
  margin: 10px 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--brown);
}

.page-about .role-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: #4a3f33;
}

.page-about .about-team__place {
  padding-top: 18px;
  border-top: 1px dashed var(--ab-stage-border);
}

.page-about .about-team__place .index-label {
  color: var(--brown);
}

.page-about .about-team__addr {
  margin: 10px 0 0;
  font-size: 16px;
  line-height: 1.8;
  font-weight: 600;
  color: var(--brown);
}

.page-about .about-team__note {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: #4a3f33;
}

.page-about .about-team__note a {
  color: var(--blue-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(11, 95, 255, 0.35);
}

.page-about .about-team__note a:hover {
  border-bottom-color: var(--blue);
}

.page-about .about-team__icp {
  margin: 18px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

/* ============ 收束 ============ */
.page-about .about-cta {
  padding-bottom: clamp(56px, 9vw, 110px);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: clamp(26px, 4vw, 44px);
  border-radius: var(--r-lg);
  background: linear-gradient(140deg, var(--ink) 0%, var(--ink-2) 100%);
  color: #ffffff;
}

.page-about .about-cta__inner h2 {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 30px);
  line-height: 1.35;
  font-weight: 700;
  color: #ffffff;
}

.page-about .about-cta__inner p {
  margin: 12px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.78);
}

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

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-about .about-work__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .about-work__list {
    gap: 16px;
  }

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

  .page-about .about-team__body {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }

  .page-about .timeline {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 52px);
    align-items: start;
  }

  .page-about .timeline__rail {
    position: sticky;
    top: 96px;
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0 0 0 20px;
    border-left: 0;
  }

  .page-about .timeline__rail::before {
    content: "";
    position: absolute;
    left: 6px;
    top: 12px;
    bottom: 12px;
    width: 1px;
    background: var(--line);
  }

  .page-about .rail-tick {
    position: relative;
    background: none;
    border: 0;
    border-radius: 0;
    padding: 10px 0;
    gap: 12px;
    color: var(--graphite);
    white-space: normal;
  }

  .page-about .rail-tick__dot {
    width: 11px;
    height: 11px;
    margin-left: -20px;
    background: #ffffff;
    border: 2px solid var(--line);
  }

  .page-about .rail-tick__year {
    font-size: 13px;
  }

  .page-about .rail-tick:hover,
  .page-about .rail-tick.is-active {
    background: none;
    border-color: transparent;
    color: var(--ink);
  }

  .page-about .rail-tick:hover .rail-tick__dot,
  .page-about .rail-tick.is-active .rail-tick__dot {
    background: var(--orange);
    border-color: var(--orange);
  }

  .page-about .about-step {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 24px;
  }

  .page-about .about-step__num {
    font-size: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-partner,
  .page-about .role-card,
  .page-about .rail-tick,
  .page-about .about-step,
  .page-about .about-step__num {
    transition: none;
  }

  .page-about .about-stage:hover,
  .page-about .about-partner:hover,
  .page-about .role-card:hover {
    transform: none;
  }
}