.page-about {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px 80px;
  background-color: var(--warm-paper);
  overflow-x: hidden;
  font-family: var(--font-body);
  color: var(--ink-700);
}

.page-about .about-hero {
  position: relative;
  padding: 40px 0 34px;
  background:
    linear-gradient(rgba(10,31,68,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10,31,68,.04) 1px, transparent 1px);
  background-size: 26px 26px;
  border-bottom: 4px solid var(--deep-blue);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 4px;
  background: linear-gradient(90deg, var(--gold) 0 76px, var(--deep-blue) 76px 128px, var(--gold) 128px 208px);
}

.page-about .about-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--deep-blue);
}

.page-about .about-label::before {
  content: "";
  display: inline-block;
  width: 28px;
  height: 4px;
  background: var(--gold);
  box-shadow: 3px 0 0 rgba(255,215,0,.35);
}

.page-about .about-hero-copy h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.9rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -.02em;
  margin: 14px 0 14px;
  color: var(--ink-700);
}

.page-about .about-hero-lead {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink-500);
  max-width: 620px;
  margin: 0;
}

.page-about .about-hero-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 28px;
}

.page-about .hero-meta-item {
  position: relative;
  background: var(--deep-blue);
  color: #fff;
  padding: 18px 10px 16px;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .hero-meta-item::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 22px 22px 0;
  border-color: transparent var(--gold) transparent transparent;
}

.page-about .hero-meta-item-gold {
  background: var(--gold);
  color: var(--deep-blue);
}

.page-about .hero-meta-item-gold::after {
  border-color: transparent var(--deep-blue) transparent transparent;
}

.page-about .hero-meta-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--gold);
  letter-spacing: -.02em;
}

.page-about .hero-meta-item-gold .hero-meta-num {
  color: var(--deep-blue);
}

.page-about .hero-meta-label {
  display: block;
  margin-top: 6px;
  font-size: .72rem;
  line-height: 1.4;
  color: rgba(255,255,255,.75);
}

.page-about .hero-meta-item-gold .hero-meta-label {
  color: rgba(10,31,68,.72);
}

.page-about .about-section-head {
  margin: 0 0 28px;
}

.page-about .about-section-head h2,
.page-about .about-intro h2,
.page-about .security-copy h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--ink-700);
  margin: 10px 0 10px;
}

.page-about .about-section-copy {
  max-width: 620px;
  margin: 0;
  color: var(--ink-500);
  line-height: 1.7;
}

.page-about .about-intro {
  display: grid;
  gap: 24px;
  padding: 40px 0 48px;
}

.page-about .about-intro-main > p {
  margin: 0 0 14px;
  line-height: 1.9;
  color: var(--ink-700);
}

.page-about .about-intro-main a {
  color: var(--deep-blue);
  font-weight: 600;
  text-decoration-color: var(--gold);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .intro-quote-card {
  background: var(--paper);
  border: 1px solid var(--line-200);
  border-top: 4px solid var(--gold);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.page-about .intro-quote-text {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--deep-blue);
  margin: 0 0 10px;
}

.page-about .intro-quote-desc {
  font-size: .92rem;
  line-height: 1.8;
  color: var(--ink-500);
  margin: 0;
}

.page-about .about-timeline-section {
  padding: 40px 0 56px;
  border-top: 1px solid var(--line-200);
}

.page-about .timeline-layout {
  display: grid;
  gap: 32px;
}

.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(to bottom, var(--gold) 0%, rgba(255,215,0,.45) 40%, rgba(255,215,0,.15) 100%);
}

.page-about .timeline-item {
  position: relative;
  padding-left: 64px;
  padding-bottom: 18px;
}

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

.page-about .timeline-node {
  position: absolute;
  left: 0;
  top: 12px;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 62px;
  height: 28px;
  background: var(--gold);
  color: var(--deep-blue);
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .02em;
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 50%, calc(100% - 9px) 100%, 0 100%);
  box-shadow: 0 2px 8px rgba(255,215,0,.35);
}

.page-about .timeline-card {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--line-200);
  border-left: 4px solid var(--deep-blue);
  padding: 20px 20px 18px;
  transition:
    transform var(--speed-base) var(--ease),
    box-shadow var(--speed-base) var(--ease),
    border-left-color var(--speed-base) var(--ease);
}

.page-about .timeline-item:hover .timeline-card,
.page-about .timeline-item:focus-within .timeline-card {
  transform: translateX(6px);
  box-shadow: var(--shadow-soft);
  border-left-color: var(--gold);
}

.page-about .timeline-card h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink-700);
  margin: 0 0 8px;
  padding-right: 40px;
}

.page-about .timeline-card p {
  font-size: .92rem;
  line-height: 1.75;
  color: var(--ink-500);
  margin: 0;
}

.page-about .timeline-index {
  position: absolute;
  top: 12px;
  right: 14px;
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  color: rgba(10,31,68,.07);
}

.page-about .timeline-detail {
  display: block;
  max-height: 0;
  margin-top: 0;
  padding-top: 0;
  overflow: hidden;
  opacity: 0;
  transform: translateY(6px);
  border-top: 1px dashed transparent;
  font-size: .88rem;
  transition:
    max-height var(--speed-base) var(--ease),
    opacity var(--speed-base) var(--ease),
    transform var(--speed-base) var(--ease),
    margin var(--speed-base) var(--ease),
    padding var(--speed-base) var(--ease),
    border-color var(--speed-base) var(--ease);
}

.page-about .timeline-item:hover .timeline-detail,
.page-about .timeline-item:focus-within .timeline-detail {
  max-height: 120px;
  margin-top: 12px;
  padding-top: 10px;
  opacity: 1;
  transform: translateY(0);
  border-top-color: var(--line-200);
}

.page-about .timeline-visual {
  background: var(--deep-blue);
  padding: 12px;
  border: 1px solid var(--line-200);
}

.page-about .timeline-visual img {
  display: block;
  width: 100%;
  max-width: 500px;
  height: auto;
  margin: 0 auto;
}

.page-about .timeline-visual-caption {
  padding: 12px 8px 4px;
  font-size: .85rem;
  text-align: center;
  color: rgba(255,255,255,.7);
}

.page-about .about-data-section {
  position: relative;
  margin: 40px 0 56px;
  padding: 44px 24px;
  overflow: hidden;
  color: #fff;
  background:
    linear-gradient(rgba(255,215,0,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,215,0,.08) 1px, transparent 1px),
    linear-gradient(135deg, var(--deep-blue) 0%, var(--deep-blue-2) 100%);
  background-size: 26px 26px, 26px 26px, 100% 100%;
}

.page-about .about-data-section h2 {
  color: #fff;
}

.page-about .about-data-section .about-section-copy {
  color: rgba(255,255,255,.7);
}

.page-about .about-data-section .about-label {
  color: var(--gold);
}

.page-about .about-data-section .about-section-head,
.page-about .about-data-section .data-bars,
.page-about .about-data-section .data-cards {
  position: relative;
  z-index: 1;
}

.page-about .data-section-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: .22;
  pointer-events: none;
}

.page-about .data-section-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .data-bars {
  display: grid;
  gap: 20px;
  margin-top: 30px;
}

.page-about .data-bar-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
  font-size: .92rem;
  color: rgba(255,255,255,.85);
}

.page-about .data-bar-value {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--gold);
}

.page-about .data-bar-track {
  height: 14px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
}

.page-about .data-bar-fill {
  position: relative;
  width: var(--bar-w, 0%);
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--gold-soft));
  box-shadow: 0 0 14px rgba(255,215,0,.45);
}

.page-about .data-bar-fill::after {
  content: "";
  position: absolute;
  right: 6px;
  top: 2px;
  bottom: 2px;
  width: 14px;
  background: repeating-linear-gradient(135deg, var(--deep-blue) 0 4px, transparent 4px 8px);
}

.page-about .data-cards {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-about .data-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 22px 18px;
  background: rgba(255,255,255,.95);
  border-bottom: 3px solid var(--gold);
}

.page-about .data-card-num {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1;
  color: var(--deep-blue);
}

.page-about .data-card-label {
  font-size: .88rem;
  color: var(--ink-500);
}

.page-about .data-card-gold {
  background: var(--gold);
  border-bottom: 3px solid var(--deep-blue);
}

.page-about .data-card-gold .data-card-num {
  color: var(--deep-blue);
}

.page-about .about-security-section {
  padding: 40px 0 56px;
  border-top: 1px solid var(--line-200);
}

.page-about .security-layout {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .security-visual {
  position: relative;
  background: var(--deep-blue);
  padding: 16px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .security-visual::after {
  content: "A级";
  position: absolute;
  top: 20px;
  right: 0;
  padding: 6px 14px;
  background: var(--gold);
  color: var(--deep-blue);
  font-family: var(--font-heading);
  font-size: .8rem;
  font-weight: 800;
  letter-spacing: .1em;
}

.page-about .security-visual img {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  margin: 0 auto;
}

.page-about .security-copy ul {
  list-style: none;
  margin: 20px 0 24px;
  padding: 0;
}

.page-about .security-copy li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
  line-height: 1.7;
  color: var(--ink-700);
}

.page-about .security-copy li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 12px;
  height: 12px;
  background: var(--gold);
  border: 2px solid var(--deep-blue);
  transform: rotate(45deg);
}

.page-about .security-link {
  display: inline-block;
  margin-top: 8px;
}

.page-about .about-team-section {
  padding: 40px 0 24px;
}

.page-about .team-grid {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-about .team-card {
  position: relative;
  padding: 28px 22px 22px;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--line-200);
  transition:
    border-color var(--speed-base) var(--ease),
    box-shadow var(--speed-base) var(--ease);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gold);
}

.page-about .team-card:hover {
  border-color: var(--deep-blue);
  box-shadow: var(--shadow-card);
}

.page-about .team-card-dark {
  background: var(--deep-blue);
  border-color: var(--deep-blue);
}

.page-about .team-card-dark::before {
  width: 6px;
}

.page-about .team-card-dark:hover {
  border-color: var(--gold);
  box-shadow: 0 8px 28px rgba(10,31,68,.25);
}

.page-about .team-card-num {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1;
  color: var(--deep-blue);
}

.page-about .team-card-dark .team-card-num {
  color: var(--gold);
}

.page-about .team-card h3 {
  margin: 16px 0 8px;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink-700);
}

.page-about .team-card-dark h3 {
  color: #fff;
}

.page-about .team-card p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--ink-500);
}

.page-about .team-card-dark p {
  color: rgba(255,255,255,.75);
}

.page-about .team-cta {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--line-200);
}

.page-about .team-cta p {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--ink-700);
}

.page-about .team-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 640px) {
  .page-about .hero-meta-num {
    font-size: 2rem;
  }

  .page-about .data-cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 920px) {
  .page-about {
    padding: 0 32px 96px;
  }

  .page-about .about-hero {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 48px;
    align-items: end;
    padding: 64px 0 56px;
  }

  .page-about .about-hero-meta {
    grid-template-columns: 1fr;
    gap: 14px;
    margin-top: 0;
  }

  .page-about .about-hero-lead {
    font-size: 1.06rem;
  }

  .page-about .about-intro {
    grid-template-columns: 2fr 1fr;
    gap: 56px;
    padding: 72px 0 80px;
  }

  .page-about .about-timeline-section {
    padding: 64px 0 84px;
  }

  .page-about .timeline-layout {
    grid-template-columns: 1fr 360px;
    gap: 48px;
    align-items: start;
  }

  .page-about .timeline-visual {
    margin-top: 8px;
  }

  .page-about .about-data-section {
    margin: 56px 0 80px;
    padding: 64px 48px;
  }

  .page-about .data-bars {
    gap: 24px;
    margin-top: 36px;
  }

  .page-about .about-security-section {
    padding: 72px 0 80px;
  }

  .page-about .security-layout {
    grid-template-columns: 380px 1fr;
    gap: 64px;
  }

  .page-about .about-team-section {
    padding: 64px 0 32px;
  }

  .page-about .team-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (hover: none) {
  .page-about .timeline-detail {
    max-height: none;
    margin-top: 12px;
    padding-top: 10px;
    opacity: 1;
    transform: none;
    border-top-color: var(--line-200);
  }
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .data-bar-fill {
    animation: about-bars-grow .6s var(--ease) both;
  }

  .page-about .data-bar-item:nth-child(2) .data-bar-fill {
    animation-delay: .1s;
  }

  .page-about .data-bar-item:nth-child(3) .data-bar-fill {
    animation-delay: .2s;
  }

  .page-about .data-bar-item:nth-child(4) .data-bar-fill {
    animation-delay: .3s;
  }
}

@keyframes about-bars-grow {
  from {
    width: 0;
  }
  to {
    width: var(--bar-w);
  }
}

.page-about {
  --bar-w: 1rem;
}