.page-about {
  --about-ink-soft: #2b3a4a;
  --about-eyebrow-dark: #8a6a12;
  --about-hair: rgba(36, 69, 107, 0.6);
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  padding: clamp(28px, 4vw, 48px) 0 clamp(44px, 6vw, 80px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(28px, 6vw, 52px);
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--paper);
  max-width: 20em;
}

.page-about .about-hero .lead {
  margin-top: 22px;
  max-width: 34em;
  color: var(--muted);
  font-size: 16.5px;
  line-height: 1.85;
}

.page-about .hero-stats {
  list-style: none;
  margin: clamp(34px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 20px;
}

.page-about .hs-item {
  position: relative;
  padding-left: 14px;
  border-left: 1px solid var(--about-hair);
  min-width: 0;
}

.page-about .hs-item::after {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  width: 1px;
  height: 22px;
  background: var(--gold);
}

.page-about .hs-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 7vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .hs-plus {
  font-size: 0.55em;
  font-weight: 600;
  margin-left: 1px;
  color: var(--gold-lite);
}

.page-about .hs-unit {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  color: var(--paper);
}

.page-about .hs-desc {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  line-height: 1.5;
}

/* ============ 我们在做一件什么事 ============ */
.page-about .about-mission {
  padding: clamp(36px, 5vw, 64px) 0 clamp(44px, 6vw, 76px);
  border-top: 1px solid var(--rule);
}

.page-about .about-mission .section-title {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .mission-body {
  margin-top: 24px;
  max-width: 34em;
}

.page-about .mission-body p {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .mission-body p + p {
  margin-top: 0.9em;
}

/* ============ 历程轴 ============ */
.page-about .about-timeline {
  padding: clamp(40px, 6vw, 76px) 0 clamp(48px, 7vw, 90px);
  border-top: 1px solid var(--rule);
}

.page-about .about-timeline .section-title {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-timeline .lead {
  margin-top: 16px;
  max-width: 34em;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .timeline-figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

.page-about .timeline {
  list-style: none;
  margin: clamp(34px, 5vw, 54px) 0 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--about-hair);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 34px;
  scroll-margin-top: 96px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cinnabar);
  box-shadow: 0 0 0 3px var(--ink);
  transition: background 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .tl-item:target::before {
  background: var(--gold);
  transform: scale(1.35);
}

.page-about .tl-year {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  width: fit-content;
}

.page-about .tl-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .tl-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--jade);
  border: 1px solid rgba(46, 139, 114, 0.45);
  padding: 1px 6px;
  clip-path: polygon(4px 0, 100% 0, 100% calc(100% - 4px), calc(100% - 4px) 100%, 0 100%, 0 4px);
}

.page-about .tl-body h3 {
  margin: 10px 0 0;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .tl-body p {
  margin: 8px 0 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ============ 浅米长文区 ============ */
.page-about .about-sand {
  background: var(--sand);
  color: var(--ink);
  padding: clamp(48px, 7vw, 92px) 0 clamp(52px, 8vw, 100px);
  position: relative;
}

.page-about .about-sand::before {
  content: "";
  position: absolute;
  left: 0;
  top: -2px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(201, 162, 39, 0.15) 60%, transparent 100%);
}

.page-about .eyebrow--dark {
  color: var(--about-eyebrow-dark);
}

.page-about .sand-title {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .feature-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
  margin-top: clamp(32px, 5vw, 52px);
}

.page-about .feature-text p {
  color: var(--about-ink-soft);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .feature-text p + p {
  margin-top: 0.9em;
}

.page-about .feature-heading {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(20px, 3vw, 26px);
  line-height: 1.35;
  color: var(--ink);
}

.page-about .feature-media {
  margin: 0;
}

/* ============ 覆盖与规模 ============ */
.page-about .about-scale {
  padding: clamp(44px, 6vw, 80px) 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-scale .section-title {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .scale-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
  margin-top: clamp(26px, 4vw, 40px);
  align-items: start;
}

.page-about .scale-main .lead {
  margin: 0;
  max-width: 32em;
  color: var(--paper);
  font-size: 16.5px;
  line-height: 1.85;
}

.page-about .scale-note {
  margin: 16px 0 0;
  max-width: 32em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .scale-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .scale-list li {
  background: var(--panel);
  padding: 18px 20px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .scale-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
  min-width: 3.4em;
}

.page-about .scale-plus {
  font-size: 0.5em;
  color: var(--gold-lite);
  margin-left: 1px;
}

.page-about .scale-label {
  font-size: 14px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* ============ 合作与认可 ============ */
.page-about .about-partners {
  padding: clamp(44px, 6vw, 80px) 0 clamp(52px, 7vw, 96px);
  border-top: 1px solid var(--rule);
}

.page-about .about-partners .section-title {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .partner-grid {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .partner-card {
  background: var(--panel);
  border: 1px solid var(--rule);
  padding: 24px 22px 26px;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .partner-card:hover {
  border-color: var(--gold-lite);
  transform: translateY(-2px);
}

.page-about .partner-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--jade);
}

.page-about .partner-card h3 {
  margin: 10px 0 0;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 18px;
  color: var(--paper);
}

.page-about .partner-card p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-cta {
  margin-top: clamp(32px, 5vw, 52px);
  padding-top: clamp(24px, 4vw, 36px);
  border-top: 1px solid var(--about-hair);
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: center;
}

.page-about .cta-text {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

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

/* ============ 响应式 ============ */
@media (min-width: 700px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px 24px;
  }

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

  .page-about .scale-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .page-about .scale-num {
    min-width: 0;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 900px) {
  .page-about .feature-row {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }

  .page-about .feature-row--reverse {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  }

  .page-about .feature-row--reverse .feature-text {
    order: 2;
  }

  .page-about .feature-row--reverse .feature-media {
    order: 1;
  }

  .page-about .scale-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .scale-list {
    grid-template-columns: 1fr;
  }

  .page-about .scale-list li {
    flex-direction: row;
    align-items: baseline;
    gap: 16px;
    padding: 20px 22px;
  }

  .page-about .scale-num {
    min-width: 3.6em;
  }

  .page-about .timeline {
    padding-left: 26px;
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 26px;
    padding-bottom: 40px;
  }

  .page-about .tl-year {
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
    padding-top: 2px;
  }

  .page-about .tl-num {
    font-size: 19px;
  }

  .page-about .tl-body h3 {
    margin-top: 0;
  }

  .page-about .tl-item::before {
    left: -29.5px;
    top: 8px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero h1 {
    max-width: 17em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .partner-card,
  .page-about .tl-item::before {
    transition: none;
  }
}