.page-about {
  --about-edge: clamp(20px, 4vw, 48px);
  --about-rule-bg: linear-gradient(120deg,
    transparent 0%, transparent 10%,
    var(--color-blue) 10%, var(--color-blue) 24%,
    transparent 24%, transparent 42%,
    var(--color-gold) 42%, var(--color-gold) 48%,
    transparent 48%, transparent 66%,
    var(--color-blue) 66%, var(--color-blue) 78%,
    transparent 78%);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  overflow-x: hidden;
}
.page-about .breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 22px var(--about-edge) 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--color-blue);
}
.page-about .breadcrumb a {
  color: var(--color-ink);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--color-red);
  text-decoration: underline;
}
.page-about .narrow-block {
  max-width: 680px;
  margin: 0 auto;
}
.page-about .wide-block {
  max-width: 1280px;
  margin: 0 auto;
}
.page-about .section-index {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-blue);
}
.page-about h2 {
  margin: 0 0 18px;
  font-family: var(--font-sans);
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  font-weight: 900;
  line-height: 1.25;
  color: var(--color-ink);
}

/* 封面区 */
.page-about .cover-section {
  padding: 40px var(--about-edge) 0;
}
.page-about .cover-layout {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: center;
}
.page-about .cover-figure {
  position: relative;
  margin: 0;
  background: var(--color-ink);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow-nav);
}
.page-about .cover-figure::after {
  content: "";
  position: absolute;
  right: -32px;
  bottom: -32px;
  width: 120px;
  height: 120px;
  background: linear-gradient(135deg, transparent 50%, var(--color-gold) 50%);
  opacity: 0.7;
}
.page-about .cover-image {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .cover-kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-blue);
}
.page-about h1 {
  margin: 0 0 22px;
  color: var(--color-ink);
}
.page-about .cover-question {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.3;
  color: var(--color-red);
  background: rgba(195, 39, 43, 0.08);
  padding: 6px 12px;
  border-radius: 6px;
  margin-bottom: 16px;
}
.page-about .cover-title-main {
  display: block;
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.01em;
}
.page-about .cover-lead {
  margin: 0 0 24px;
  max-width: 56ch;
  font-size: 1.02rem;
  color: var(--color-text);
}
.page-about .cover-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  padding: 22px 20px;
  background: var(--color-white-soft);
  border: 1px solid var(--color-white-border);
  border-radius: 16px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
}
.page-about .stat-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.page-about .stat-value {
  font-family: var(--font-mono);
  font-size: 2.1rem;
  font-weight: 900;
  line-height: 1;
  color: var(--color-blue);
}
.page-about .stat-value.is-gold {
  color: var(--color-gold);
}
.page-about .stat-name {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--color-text);
}
.page-about .cover-note {
  margin: 18px 0 0;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-blue);
  background: var(--color-blue-bg);
  border-left: 3px solid var(--color-blue);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.page-about .cover-rule {
  max-width: 1280px;
  margin: 56px auto 0;
  height: 10px;
  background: var(--about-rule-bg);
  transform: skewY(-0.4deg);
}

/* 起源区 */
.page-about .origin-section {
  padding: 64px var(--about-edge) 24px;
}
.page-about .origin-section p {
  margin: 0 0 18px;
}
.page-about .origin-quote {
  margin: 32px 0 36px;
  padding: 22px 24px;
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-gold);
  border-radius: 0 12px 12px 0;
  position: relative;
}
.page-about .origin-quote::before {
  content: "◆";
  position: absolute;
  top: 16px;
  right: 20px;
  color: var(--color-gold);
  font-size: 0.9rem;
}
.page-about .origin-quote p {
  margin: 0;
  font-size: 1.05rem;
  color: var(--color-ink);
}

/* 里程碑区 */
.page-about .milestone-section {
  padding: 56px var(--about-edge) 80px;
}
.page-about .milestone-scene {
  position: relative;
  max-width: 1280px;
  margin: 0 auto 44px;
  min-height: 320px;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow-nav);
  display: flex;
  align-items: flex-end;
}
.page-about .milestone-figure {
  position: absolute;
  inset: 0;
  margin: 0;
}
.page-about .milestone-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .milestone-caption {
  position: relative;
  z-index: 2;
  margin: auto 16px 16px;
  padding: 20px 22px;
  max-width: 620px;
  background: rgba(13, 43, 78, 0.74);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  color: var(--color-deep-text);
}
.page-about .milestone-caption .section-index {
  color: var(--color-gold);
}
.page-about .milestone-caption p {
  margin: 0;
}
.page-about .milestone-caption h2 {
  color: var(--color-white);
}
.page-about .timeline-wrap {
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
}
.page-about .timeline-list {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .timeline-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 4px;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--color-blue) 0%, var(--color-gold) 100%);
}
.page-about .timeline-item {
  position: relative;
  padding: 20px 22px 20px 38px;
  background: var(--color-white);
  border: 1px solid var(--color-blue-border);
  border-radius: 12px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}
.page-about .timeline-item:hover,
.page-about .timeline-item:focus-within {
  transform: translateY(-4px);
  border-color: var(--color-blue);
  box-shadow: var(--shadow-nav);
}
.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 32px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-blue);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-blue);
  z-index: 2;
}
.page-about .timeline-item:nth-child(odd)::before {
  background: var(--color-gold);
  box-shadow: 0 0 0 2px var(--color-gold);
}
.page-about .timeline-year {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-blue);
  background: var(--color-blue-bg);
  border-radius: 999px;
}
.page-about .timeline-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--color-ink);
}
.page-about .timeline-item p {
  margin: 0;
  font-size: 0.96rem;
}

/* 服务覆盖区 */
.page-about .service-section {
  padding: 64px var(--about-edge);
  background: var(--color-bg-alt);
}
.page-about .service-lead {
  max-width: 66ch;
  margin-bottom: 32px;
  font-size: 1.02rem;
}
.page-about .service-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.page-about .service-card {
  position: relative;
  padding: 28px 24px 24px;
  background: var(--color-white);
  border: 1px solid var(--color-blue-border);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.page-about .service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-blue), var(--color-gold));
}
.page-about .service-card:hover,
.page-about .service-card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-nav);
}
.page-about .service-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 3.3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--color-blue);
}
.page-about .service-card .service-num.is-gold {
  color: var(--color-gold);
}
.page-about .service-card h3 {
  margin: 0 0 10px;
  color: var(--color-ink);
}
.page-about .daily-badge {
  display: inline-block;
  margin-bottom: 14px;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-white);
  background: var(--color-red);
  border-radius: 999px;
}

/* 团队区 */
.page-about .team-section {
  padding: 64px var(--about-edge);
}
.page-about .team-layout {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  align-items: center;
}
.page-about .team-copy p {
  margin: 0 0 16px;
}
.page-about .process-list {
  display: grid;
  gap: 10px;
  list-style: none;
  margin: 24px 0 28px;
  padding: 0;
}
.page-about .process-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 12px 16px;
  background: var(--color-bg-alt);
  border-left: 3px solid var(--color-blue);
  border-radius: 10px;
}
.page-about .process-step {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-gold);
}
.page-about .team-figure {
  position: relative;
  margin: 0;
  border-radius: 14px;
  overflow: hidden;
  background: var(--color-ink);
  box-shadow: var(--shadow-card);
}
.page-about .team-image {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .figure-caption {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-ink);
  background: var(--color-white-soft);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--color-white-border);
  border-radius: 6px;
}

/* 结尾深色区 */
.page-about .next-section {
  position: relative;
  padding: 72px var(--about-edge);
  background: linear-gradient(135deg, var(--color-ink) 0%, var(--color-blue) 100%);
  color: var(--color-deep-text);
  overflow: hidden;
}
.page-about .next-section::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -80px;
  width: 240px;
  height: 240px;
  background: linear-gradient(135deg, transparent 45%, var(--color-gold) 45% 60%, transparent 60%);
  opacity: 0.18;
  transform: rotate(45deg);
}
.page-about .next-kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-gold);
}
.page-about .next-section h2 {
  color: var(--color-white);
  font-size: clamp(1.8rem, 5vw, 3rem);
}
.page-about .next-section p {
  max-width: 60ch;
}
.page-about .next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 28px 0 12px;
}
.page-about .next-support {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-muted-deep);
}

@media (min-width: 900px) {
  .page-about .cover-section {
    padding-top: 56px;
  }
  .page-about .cover-layout {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 64px;
  }
  .page-about .cover-stats {
    gap: 18px;
    padding: 24px 28px;
  }
  .page-about .milestone-scene {
    min-height: 480px;
  }
  .page-about .milestone-caption {
    margin: auto 32px 32px;
    padding: 24px 28px;
  }
  .page-about .timeline-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 20px;
    padding-top: 52px;
  }
  .page-about .timeline-line {
    top: 9px;
    bottom: auto;
    left: 2%;
    right: 2%;
    width: auto;
    height: 3px;
    background: linear-gradient(90deg, var(--color-blue) 0%, var(--color-gold) 100%);
  }
  .page-about .timeline-item {
    padding: 22px;
  }
  .page-about .timeline-item::before {
    left: 50%;
    top: -48px;
    transform: translateX(-50%);
  }
  .page-about .service-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 48px;
  }
}

@media (min-width: 600px) and (max-width: 899px) {
  .page-about .service-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .service-card:last-child {
    grid-column: span 2;
  }
}