.page-about {
  --about-gutter: 1.5rem;
  --about-section-gap: 4rem;
  --about-card-padding: 1.4rem;
  position: relative;
  overflow-x: hidden;
  min-height: 70vh;
  background:
    radial-gradient(1200px 520px at 90% -60px, rgba(18, 26, 58, 0.55), transparent 60%),
    radial-gradient(900px 420px at 8% 100%, rgba(15, 76, 92, 0.18), transparent 65%),
    var(--bg-deep);
  color: var(--text-main);
  font-family: var(--font-mono);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .container {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--about-gutter);
}

/* 面包屑 */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  padding-top: 1.25rem;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--text-sub);
}

.page-about .breadcrumbs a {
  color: var(--text-sub);
  text-decoration: none;
  padding: 0.2rem 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--neon-green);
  border-bottom-color: var(--neon-green);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--neon-green);
}

.page-about .breadcrumb-sep {
  color: var(--grid-line);
}

/* 英雄区 */
.page-about .about-hero {
  padding-top: 2rem;
  padding-bottom: 3rem;
}

.page-about .about-hero-index {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--grid-line);
  padding-bottom: 0.8rem;
  margin-bottom: 1.75rem;
}

.page-about .about-hero-file-id {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--electric-orange);
  text-transform: uppercase;
}

.page-about .about-hero-version {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--neon-green);
  background: rgba(0, 255, 135, 0.08);
  border: 1px solid rgba(0, 255, 135, 0.35);
  padding: 0.25rem 0.8rem 0.25rem 0.55rem;
  clip-path: polygon(0 0, calc(100% - 7px) 0, 100% 100%, 7px 100%);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 900;
  line-height: 1.4;
  letter-spacing: 0.01em;
  max-width: 46rem;
  margin: 0 0 1.2rem;
}

.page-about .about-hero-lead {
  max-width: 52rem;
  font-size: 1rem;
  line-height: 1.95;
  color: var(--text-sub);
  margin: 0 0 2rem;
}

.page-about .about-hero-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin: 0;
  max-width: 42rem;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
}

.page-about .hero-meta-cell {
  background: var(--bg-panel);
  padding: 0.9rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .hero-meta-cell dt {
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--text-sub);
}

.page-about .hero-meta-cell dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

/* 章节通用 */
.page-about .about-section {
  position: relative;
  padding: var(--about-section-gap) 0;
}

.page-about .about-section-head {
  display: flex;
  align-items: flex-end;
  gap: 1.1rem;
  border-bottom: 1px solid var(--grid-line);
  padding-bottom: 1.1rem;
  margin-bottom: 2rem;
}

.page-about .section-index {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 3.75rem;
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1px rgba(42, 59, 92, 0.9);
  user-select: none;
}

.page-about .about-section-titles {
  min-width: 0;
}

.page-about .about-section-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--neon-green);
  text-transform: uppercase;
  margin: 0 0 0.35rem;
}

.page-about .about-section h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 900;
  line-height: 1.3;
  margin: 0;
  color: var(--text-main);
}

.page-about .about-section h2::after {
  content: '';
  display: block;
  width: 3.25rem;
  height: 0.32rem;
  margin-top: 0.7rem;
  background: linear-gradient(90deg, var(--neon-green), transparent);
}

/* 01 品牌使命 */
.page-about .about-mission {
  padding-top: 1rem;
}

.page-about .about-mission::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(780px 320px at 15% 20%, rgba(15, 76, 92, 0.3), transparent 70%);
}

.page-about .about-mission-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.8rem;
}

.page-about .about-mission-content {
  position: relative;
  background:
    radial-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    var(--bg-panel);
  background-size: 8px 8px, auto;
  border: 1px solid var(--grid-line);
  border-left: 4px solid var(--neon-green);
  padding: var(--about-card-padding);
}

.page-about .about-mission-slogan {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 900;
  color: var(--neon-green);
  letter-spacing: 0.08em;
  margin: 0 0 0.9rem;
}

.page-about .about-mission-text {
  color: var(--text-sub);
  line-height: 1.9;
  font-size: 0.95rem;
  margin: 0 0 1.2rem;
}

.page-about .about-mission-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.page-about .about-mission-points li {
  position: relative;
  padding-left: 1.4rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-main);
}

.page-about .about-mission-points li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 0.5rem;
  height: 0.5rem;
  background: var(--electric-orange);
  clip-path: polygon(0 0, 100% 0, 85% 100%, 0 100%);
}

.page-about .about-mission-points a,
.page-about .about-honor-card a {
  color: var(--neon-green);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 255, 135, 0.4);
}

.page-about .about-mission-points a:hover,
.page-about .about-mission-points a:focus-visible {
  border-bottom-color: var(--neon-green);
}

.page-about .about-mission-figure {
  margin: 0;
  background: var(--bg-panel);
  border: 1px solid var(--grid-line);
  padding: 0.75rem;
  align-self: start;
}

.page-about .about-mission-figure img {
  display: block;
  width: 100%;
  object-fit: cover;
}

.page-about figcaption {
  padding-top: 0.6rem;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--text-sub);
}

/* 02 发展历程 */
.page-about .about-journey::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(42, 59, 92, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 59, 92, 0.12) 1px, transparent 1px),
    radial-gradient(900px 420px at 20% 10%, rgba(15, 76, 92, 0.35), transparent 70%);
  background-size: 44px 44px, 44px 44px, auto;
}

.page-about .about-journey .container {
  position: relative;
  z-index: 1;
}

.page-about .about-journey-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.2rem;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 1rem 0 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 0.85rem;
  top: 2.2rem;
  bottom: 1.8rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--neon-green), var(--grid-line) 80%, transparent);
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 1.75rem 2.3rem;
}

.page-about .timeline-item::before {
  content: '';
  position: absolute;
  left: 0.65rem;
  top: 0.9rem;
  width: 0.55rem;
  height: 0.55rem;
  background: var(--bg-deep);
  border: 2px solid var(--neon-green);
  transform: rotate(45deg);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.page-about .timeline-item.is-visible::before {
  background: var(--neon-green);
  box-shadow: 0 0 0 4px rgba(0, 255, 135, 0.16);
}

.page-about .timeline-year {
  display: inline-block;
  background: var(--jade);
  color: var(--text-main);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 0.22rem 1rem 0.22rem 0.65rem;
  clip-path: polygon(0 0, calc(100% - 7px) 0, 100% 100%, 0 100%);
}

.page-about .timeline-card {
  margin-top: 0.5rem;
  background:
    radial-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    var(--bg-panel);
  background-size: 8px 8px, auto;
  border: 1px solid var(--grid-line);
  border-left: 3px solid var(--neon-green);
  padding: 0.9rem 1.1rem;
}

.page-about .timeline-card h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--text-main);
}

.page-about .timeline-card p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--text-sub);
}

.page-about .timeline-card a,
.page-about .about-team-note a,
.page-about .about-honors-footer a,
.page-about .honor-card-note a {
  color: var(--neon-green);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 255, 135, 0.4);
}

.page-about .timeline-card a:hover,
.page-about .timeline-card a:focus-visible,
.page-about .about-team-note a:hover,
.page-about .about-team-note a:focus-visible,
.page-about .about-honors-footer a:hover,
.page-about .about-honors-footer a:focus-visible {
  border-bottom-color: var(--neon-green);
}

.page-about .about-journey-figure {
  margin: 0;
  background: linear-gradient(180deg, rgba(15, 76, 92, 0.22), var(--bg-panel));
  border: 1px solid var(--grid-line);
  padding: 0.75rem;
  align-self: start;
}

.page-about .about-journey-figure img {
  display: block;
  width: 100%;
  object-fit: contain;
}

/* 03 团队构成 */
.page-about .about-team::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(960px 460px at 85% 28%, rgba(45, 27, 78, 0.42), transparent 70%);
}

.page-about .about-team .container {
  position: relative;
  z-index: 1;
}

.page-about .about-team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.6rem;
}

.page-about .about-team-figure {
  margin: 0;
  background: var(--bg-panel);
  border: 1px solid var(--grid-line);
  padding: 0.75rem;
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  object-fit: cover;
}

.page-about .about-team-intro {
  margin: 0;
  max-width: 54rem;
  font-size: 0.98rem;
  line-height: 1.95;
  color: var(--text-sub);
}

.page-about .team-stat-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .team-stat-card {
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--grid-line);
  border-top: 3px solid var(--grid-line);
  padding: 1.25rem;
  transition: transform 0.25s var(--ease-out), border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .team-stat-card:hover,
.page-about .team-stat-card:focus-within {
  transform: translateY(-4px);
  border-top-color: var(--neon-green);
  box-shadow: 0 10px 26px rgba(0, 255, 135, 0.08);
}

.page-about .team-stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1;
  color: var(--neon-green);
  margin-bottom: 0.5rem;
}

.page-about .team-stat-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--electric-orange);
  background: rgba(255, 107, 0, 0.12);
  padding: 0.2rem 0.65rem;
  clip-path: polygon(0 0, calc(100% - 7px) 0, 100% 100%, 0 100%);
  margin-bottom: 0.6rem;
  text-transform: uppercase;
}

.page-about .team-stat-card p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--text-sub);
}

.page-about .about-team-note {
  margin: 0;
  font-size: 0.86rem;
  color: var(--text-sub);
  border-left: 3px solid var(--electric-orange);
  padding-left: 1rem;
}

/* 04 资质与荣誉 */
.page-about .about-honors::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(900px 420px at 50% 0%, rgba(107, 31, 58, 0.3), transparent 70%);
}

.page-about .about-honors .container {
  position: relative;
  z-index: 1;
}

.page-about .about-honor-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .honor-card {
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--grid-line);
  padding: var(--about-card-padding);
  min-height: 250px;
  transition: transform 0.3s var(--ease-out), border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .honor-card:hover,
.page-about .honor-card:focus-visible {
  transform: translateY(-5px);
  border-color: var(--neon-green);
  box-shadow: 0 12px 30px rgba(0, 255, 135, 0.08);
}

.page-about .honor-card-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--electric-orange);
  border: 2px solid var(--electric-orange);
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 100%, 9px 100%);
}

.page-about .honor-card h3 {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 800;
  line-height: 1.4;
  color: var(--text-main);
  margin: 1.1rem 0 0.5rem;
}

.page-about .honor-card p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--text-sub);
}

.page-about .honor-card-note {
  margin-top: 0.8rem !important;
  font-size: 0.78rem;
}

.page-about .honor-card-plain::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 30px 30px 0;
  border-color: transparent var(--neon-green) transparent transparent;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.page-about .honor-card-plain:hover::after {
  opacity: 0.45;
}

.page-about .honor-card-flip {
  background: transparent;
  border: none;
  padding: 0;
  min-height: 0;
  perspective: 1400px;
}

.page-about .honor-card-inner {
  position: relative;
  width: 100%;
  height: 250px;
  transform-style: preserve-3d;
  transition: transform 0.55s var(--ease-out);
}

.page-about .honor-card-flip:hover .honor-card-inner,
.page-about .honor-card-flip:focus-visible .honor-card-inner,
.page-about .honor-card-flip:focus-within .honor-card-inner {
  transform: rotateY(180deg);
}

.page-about .honor-card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: var(--bg-panel);
  border: 1px solid var(--grid-line);
  padding: var(--about-card-padding);
}

.page-about .honor-card-back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, var(--garnet), #4a1530);
  border-color: rgba(107, 31, 58, 0.9);
  display: flex;
  align-items: center;
}

.page-about .honor-card-back p {
  color: var(--text-main);
  font-size: 0.9rem;
  font-weight: 500;
}

.page-about .about-honors-footer {
  margin: 2rem 0 0;
  font-size: 0.86rem;
  color: var(--text-sub);
  border-top: 1px solid var(--grid-line);
  padding-top: 1.25rem;
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about {
    --about-gutter: 2rem;
    --about-card-padding: 1.75rem;
  }

  .page-about .about-hero-meta {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .section-index {
    font-size: 4.5rem;
  }

  .page-about .team-stat-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-mission-grid {
    grid-template-columns: 1fr 440px;
    gap: 2.4rem;
  }

  .page-about .about-mission-content {
    padding: 2.2rem;
  }

  .page-about .about-mission-figure {
    margin-top: 0;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-section-gap: 5rem;
  }

  .page-about .about-hero {
    padding-top: 3rem;
    padding-bottom: 4.5rem;
  }

  .page-about .about-hero h1 {
    font-size: 2.2rem;
  }

  .page-about .about-section-head {
    margin-bottom: 2.6rem;
  }

  .page-about .section-index {
    font-size: 5rem;
  }

  .page-about .about-section h2 {
    font-size: 1.7rem;
  }

  .page-about .about-journey-layout {
    grid-template-columns: 1fr 430px;
    gap: 3rem;
  }

  .page-about .about-team-layout {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }

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

  .page-about .about-team-intro {
    grid-column: 2;
    grid-row: 1;
    padding-left: 0.5rem;
  }

  .page-about .team-stat-list {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .page-about .about-team-note {
    grid-column: 1 / -1;
    grid-row: 3;
  }

  .page-about .about-honor-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.4rem;
  }
}