.page-about {
  --page-about-bg: #0D1B2A;
  --page-about-card: #1B263B;
  --page-about-line: rgba(0, 255, 136, 0.25);
  --page-about-green: #00FF88;
  --page-about-orange: #FF6B35;
  --page-about-amber: #FFC300;
  --page-about-cloud: #E0E1DD;
  --page-about-mist: #9BA4B5;
  --page-about-mono: 'JetBrains Mono', 'Consolas', monospace;
  --page-about-headline: 'Poppins SemiBold Italic', 'Arial Black Italic', 'Noto Sans SC Black', sans-serif;
  --page-about-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --page-about-radius: 4px;
  --page-about-transition: 280ms ease;

  background: var(--page-about-bg);
  color: var(--page-about-cloud);
  font-family: var(--page-about-body);
  line-height: 1.7;
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about a {
  color: var(--page-about-green);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--page-about-transition), color var(--page-about-transition);
}

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

.page-about__shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem 1rem 4rem;
}

/* 面包屑 */
.page-about__breadcrumb {
  margin-bottom: 2rem;
  font-family: var(--page-about-mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.breadcrumb__item--current {
  color: var(--page-about-green);
}

.breadcrumb__sep {
  color: var(--page-about-mist);
  margin: 0 0.5rem;
}

/* 首屏 Hero */
.page-about__hero {
  position: relative;
  border: 1px solid var(--page-about-line);
  border-radius: var(--page-about-radius);
  background: linear-gradient(135deg, rgba(27, 38, 59, 0.9) 0%, rgba(13, 27, 42, 0.98) 70%);
  padding: 1.75rem 1.25rem 2rem;
  overflow: hidden;
}

.page-about__hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 40%;
  height: 100%;
  background: repeating-linear-gradient(-45deg, transparent 0 12px, rgba(0, 255, 136, 0.06) 12px 13px);
  z-index: 0;
  pointer-events: none;
}

.page-about__hero::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--page-about-green) 0%, var(--page-about-orange) 100%);
}

.page-about__hero-flag {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.page-about__hero-code {
  font-family: var(--page-about-mono);
  font-size: 0.8rem;
  color: var(--page-about-green);
  letter-spacing: 0.08em;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--page-about-line);
  border-radius: var(--page-about-radius);
  background: rgba(0, 255, 136, 0.06);
}

.page-about__hero-line {
  flex: 1;
  height: 1px;
  background: var(--page-about-line);
}

.page-about__title {
  font-family: var(--page-about-headline);
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.2;
  margin: 0 0 1.25rem;
  font-style: italic;
  font-weight: 800;
  position: relative;
  z-index: 1;
}

.page-about__title-accent {
  color: var(--page-about-orange);
}

.page-about__lead {
  font-size: 1rem;
  color: var(--page-about-mist);
  max-width: 56ch;
  margin: 0 0 1.5rem;
  position: relative;
  z-index: 1;
}

.page-about__hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 1.5rem 0 1.5rem;
  position: relative;
  z-index: 1;
}

.page-about__hero-stat {
  padding: 1rem;
  background: rgba(27, 38, 59, 0.85);
  border-left: 3px solid var(--page-about-green);
  border-radius: var(--page-about-radius);
}

.page-about__hero-stat:nth-child(even) {
  border-left-color: var(--page-about-orange);
}

.page-about__hero-stat-num {
  display: block;
  font-family: var(--page-about-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--page-about-green);
  line-height: 1.2;
}

.page-about__hero-stat:nth-child(even) .page-about__hero-stat-num {
  color: var(--page-about-orange);
}

.page-about__hero-stat-label {
  font-size: 0.8rem;
  color: var(--page-about-mist);
  letter-spacing: 0.04em;
}

.page-about__hero-media {
  position: relative;
  z-index: 1;
  margin-top: 1rem;
}

.page-about__hero-img {
  width: 100%;
  height: auto;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
  filter: saturate(1.1) contrast(1.05);
}

/* 通用章节 */
.page-about__section {
  margin-top: 4.5rem;
}

.page-about__section-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--page-about-line);
  padding-bottom: 0.75rem;
}

.page-about__section-index {
  font-family: var(--page-about-mono);
  font-size: 0.9rem;
  color: var(--page-about-orange);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.page-about__section-title {
  font-family: var(--page-about-headline);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  font-style: italic;
  margin: 0;
  color: var(--page-about-cloud);
}

/* 01 使命 */
.page-about__mission-body {
  position: relative;
  padding: 1.75rem;
  background: linear-gradient(135deg, #1B263B 0%, #0D1B2A 100%);
  border: 1px solid var(--page-about-line);
  border-radius: var(--page-about-radius);
  box-shadow: 6px 6px 0 rgba(0, 255, 136, 0.12);
  display: grid;
  gap: 1.25rem;
}

.page-about__mission-copy {
  margin: 0;
  color: var(--page-about-mist);
  font-size: 1rem;
}

.page-about__mission-copy strong {
  color: var(--page-about-green);
}

/* 02 发展历程 */
.page-about__timeline-grid {
  position: relative;
}

.page-about__timeline-guide {
  position: absolute;
  left: 0.7rem;
  top: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  z-index: 0;
}

.page-about__timeline-guide-num {
  writing-mode: vertical-rl;
  font-family: var(--page-about-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--page-about-mist);
  text-transform: uppercase;
  opacity: 0.7;
}

.page-about__timeline-guide-line {
  flex: 1;
  width: 2px;
  background: linear-gradient(180deg, var(--page-about-green), var(--page-about-orange));
  border-radius: 2px;
}

.page-about__timeline-list {
  list-style: none;
  padding: 0;
  margin: 0;
  position: relative;
  z-index: 1;
}

.page-about__timeline-item {
  position: relative;
  padding: 0 0 2rem 3.5rem;
}

.page-about__timeline-item::before {
  content: '';
  position: absolute;
  left: 0.4rem;
  top: 0.6rem;
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 50%;
  background: var(--page-about-green);
  border: 3px solid #0D1B2A;
  box-shadow: 0 0 0 2px var(--page-about-green);
}

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

.page-about__timeline-year {
  display: inline-block;
  font-family: var(--page-about-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--page-about-orange);
  background: rgba(255, 107, 53, 0.1);
  border: 1px solid rgba(255, 107, 53, 0.35);
  border-radius: var(--page-about-radius);
  padding: 0.2rem 0.75rem;
  margin-bottom: 0.5rem;
}

.page-about__timeline-content {
  background: rgba(27, 38, 59, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--page-about-radius);
  padding: 1.25rem 1.5rem;
  transition: transform var(--page-about-transition), box-shadow var(--page-about-transition), border-color var(--page-about-transition);
}

.page-about__timeline-content:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
  border-color: var(--page-about-line);
}

.page-about__timeline-title {
  font-family: var(--page-about-headline);
  font-size: 1.15rem;
  font-weight: 700;
  font-style: italic;
  margin: 0 0 0.5rem;
  color: var(--page-about-cloud);
}

.page-about__timeline-content p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--page-about-mist);
  line-height: 1.7;
}

.page-about__timeline-note {
  margin-top: 2rem;
  padding: 1.5rem;
  border: 1px dashed rgba(255, 195, 0, 0.4);
  border-radius: var(--page-about-radius);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  align-items: center;
}

.page-about__timeline-img {
  width: 100%;
  height: auto;
  border-radius: var(--page-about-radius);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about__timeline-note-copy {
  margin: 0;
  font-size: 0.95rem;
  color: var(--page-about-mist);
}

.page-about__timeline-btn {
  justify-self: start;
}

/* 03 团队与组织 */
.page-about__team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.page-about__team-copy p {
  margin: 0 0 1rem;
  color: var(--page-about-mist);
  font-size: 1rem;
}

.page-about__team-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
  display: grid;
  gap: 0.9rem;
}

.page-about__team-list li {
  position: relative;
  padding: 1rem 1.25rem 1rem 3.25rem;
  background: rgba(27, 38, 59, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--page-about-radius);
  font-size: 0.95rem;
  color: var(--page-about-mist);
}

.page-about__team-list li::before {
  content: '01';
  position: absolute;
  left: 1rem;
  top: 1.1rem;
  font-family: var(--page-about-mono);
  font-size: 0.75rem;
  color: var(--page-about-green);
  font-weight: 700;
}

.page-about__team-list li:nth-child(2)::before {
  content: '02';
}

.page-about__team-list li:nth-child(3)::before {
  content: '03';
}

.page-about__team-list strong {
  color: var(--page-about-cloud);
}

.page-about__team-org {
  margin-top: 1.5rem;
  padding: 1.5rem;
  border: 1px solid var(--page-about-line);
  border-radius: var(--page-about-radius);
  background: rgba(0, 255, 136, 0.04);
  display: grid;
  gap: 0.75rem;
}

.page-about__org-node {
  font-family: var(--page-about-mono);
  font-size: 0.85rem;
  padding: 0.55rem 1rem;
  border: 1px solid var(--page-about-line);
  border-radius: var(--page-about-radius);
  color: var(--page-about-green);
  text-align: center;
  background: #0D1B2A;
}

.page-about__org-node--root {
  border-color: var(--page-about-orange);
  color: var(--page-about-orange);
  font-weight: 700;
  justify-self: center;
  min-width: 8rem;
}

.page-about__org-branch {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.page-about__team-media {
  position: relative;
}

.page-about__team-img {
  width: 100%;
  height: auto;
  border-radius: var(--page-about-radius);
  box-shadow: var(--shadow-soft);
  filter: saturate(1.05);
}

/* 04 资质与认证 */
.page-about__cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about__cert-card {
  position: relative;
  padding: 1.75rem 1.5rem;
  background: rgba(27, 38, 59, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--page-about-radius);
  transition: border-color var(--page-about-transition), box-shadow var(--page-about-transition), transform var(--page-about-transition);
  overflow: hidden;
}

.page-about__cert-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, transparent 50%, rgba(255, 107, 53, 0.12) 50%);
}

.page-about__cert-card:hover {
  border-color: var(--page-about-green);
  box-shadow: 0 12px 30px rgba(0, 255, 136, 0.08);
  transform: translateY(-3px);
}

.page-about__cert-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 1rem;
  color: var(--page-about-green);
}

.page-about__cert-title {
  font-family: var(--page-about-headline);
  font-size: 1.1rem;
  font-weight: 700;
  font-style: italic;
  margin: 0 0 0.5rem;
  color: var(--page-about-cloud);
}

.page-about__cert-desc {
  margin: 0;
  font-size: 0.9rem;
  color: var(--page-about-mist);
  line-height: 1.7;
}

.page-about__cert-note {
  margin-top: 1.75rem;
  padding: 1.25rem 1.5rem;
  border-left: 4px solid var(--page-about-amber);
  background: rgba(255, 195, 0, 0.05);
  border-radius: 0 var(--page-about-radius) var(--page-about-radius) 0;
  font-size: 0.9rem;
  color: var(--page-about-mist);
}

/* 05 合作生态 */
.page-about__eco-intro {
  margin-bottom: 2rem;
}

.page-about__eco-lead {
  font-size: 1.1rem;
  color: var(--page-about-mist);
  max-width: 68ch;
  margin: 0;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--page-about-line);
  border-radius: var(--page-about-radius);
  background: rgba(0, 255, 136, 0.03);
}

.page-about__eco-wall {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.page-about__eco-item {
  position: relative;
  padding: 1.5rem 1rem 1.25rem;
  text-align: center;
  background: #1B263B;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--page-about-radius);
  transition: transform var(--page-about-transition), border-color var(--page-about-transition), box-shadow var(--page-about-transition);
  cursor: default;
}

.page-about__eco-item:hover {
  transform: translateY(-4px);
  border-color: var(--page-about-orange);
  box-shadow: 0 10px 24px rgba(255, 107, 53, 0.12);
}

.page-about__eco-code {
  display: block;
  font-family: var(--page-about-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--page-about-green);
  margin-bottom: 0.5rem;
}

.page-about__eco-item:nth-child(even) .page-about__eco-code {
  color: var(--page-about-orange);
}

.page-about__eco-name {
  display: block;
  font-family: var(--page-about-headline);
  font-size: 1rem;
  font-weight: 700;
  font-style: italic;
  color: var(--page-about-cloud);
  margin-bottom: 0.35rem;
}

.page-about__eco-desc {
  display: block;
  font-size: 0.78rem;
  color: var(--page-about-mist);
}

.page-about__eco-cta {
  display: grid;
  gap: 1rem;
  align-items: center;
  padding: 1.5rem;
  border-top: 1px solid var(--page-about-line);
  border-bottom: 1px solid var(--page-about-line);
}

.page-about__eco-cta p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--page-about-mist);
}

.page-about__eco-btn {
  justify-self: start;
}

/* 06 行业荣誉 */
.page-about__honors-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about__honor-card {
  padding: 1.75rem 1.5rem;
  background: linear-gradient(135deg, rgba(255, 195, 0, 0.06), rgba(27, 38, 59, 0.8));
  border: 1px solid rgba(255, 195, 0, 0.22);
  border-radius: var(--page-about-radius);
  transition: box-shadow var(--page-about-transition);
}

.page-about__honor-card:hover {
  box-shadow: 0 12px 28px rgba(255, 195, 0, 0.08);
}

.page-about__honor-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 1rem;
  color: var(--page-about-amber);
}

.page-about__honor-title {
  font-family: var(--page-about-headline);
  font-size: 1.05rem;
  font-weight: 700;
  font-style: italic;
  margin: 0 0 0.5rem;
  color: var(--page-about-cloud);
}

.page-about__honor-desc {
  margin: 0;
  font-size: 0.9rem;
  color: var(--page-about-mist);
  line-height: 1.7;
}

.page-about__honors-note {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--page-about-mist);
  border-left: 3px solid var(--page-about-green);
  padding-left: 1rem;
}

/* 按钮组件 - 页面定制 */
.page-about .btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--page-about-radius);
  font-family: var(--page-about-body);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: all var(--page-about-transition);
  text-align: center;
}

.page-about .btn-primary {
  background: var(--page-about-green);
  color: #0D1B2A;
  border-color: var(--page-about-green);
}

.page-about .btn-primary:hover {
  background: transparent;
  color: var(--page-about-green);
  box-shadow: 0 0 0 1px var(--page-about-green);
  border-bottom-color: var(--page-about-green);
}

.page-about .btn-secondary {
  background: transparent;
  color: var(--page-about-green);
  border-color: var(--page-about-green);
}

.page-about .btn-secondary:hover {
  background: var(--page-about-green);
  color: #0D1B2A;
  border-bottom-color: var(--page-about-green);
}

/* 缩略图响应式处理 */
.page-about__hero-media img,
.page-about__timeline-img,
.page-about__team-img {
  object-fit: cover;
}

/* 桌面端布局 */
@media (min-width: 768px) {
  .page-about__shell {
    padding: 2rem 2rem 5rem;
  }

  .page-about__hero {
    padding: 3rem 3rem 2.5rem;
  }

  .page-about__hero-stats {
    grid-template-columns: repeat(4, 1fr);
    margin: 2.5rem 0;
  }

  .page-about__hero-stat-num {
    font-size: 1.75rem;
  }

  .page-about__section {
    margin-top: 6rem;
  }

  .page-about__timeline-item {
    padding: 0 0 2.5rem 4.5rem;
  }

  .page-about__timeline-item::before {
    left: 0.5rem;
    top: 0.7rem;
    width: 1rem;
    height: 1rem;
  }

  .page-about__timeline-guide {
    left: 0.85rem;
  }

  .page-about__timeline-note {
    grid-template-columns: 2fr 3fr 1fr;
    gap: 2rem;
    align-items: center;
  }

  .page-about__team-layout {
    grid-template-columns: 3fr 2fr;
    gap: 3rem;
  }

  .page-about__cert-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }

  .page-about__eco-wall {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
  }

  .page-about__eco-cta {
    grid-template-columns: 1fr auto;
    gap: 2rem;
  }

  .page-about__honors-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .page-about__mission-body {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    padding: 2.5rem 3rem;
  }
}

/* 超宽屏优化 */
@media (min-width: 1280px) {
  .page-about__shell {
    padding-left: 3rem;
    padding-right: 3rem;
  }

  .page-about__hero {
    display: grid;
    grid-template-columns: 7fr 5fr;
    column-gap: 3rem;
  }

  .page-about__hero-flag {
    grid-column: 1 / -1;
  }

  .page-about__title,
  .page-about__lead {
    grid-column: 1;
  }

  .page-about__hero-stats {
    grid-column: 1 / -1;
    grid-row: 3;
    margin-top: 2rem;
  }

  .page-about__hero-media {
    grid-column: 2;
    grid-row: 1 / 3;
    align-self: center;
    margin-top: 0;
  }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }

  .page-about__timeline-content:hover,
  .page-about__cert-card:hover,
  .page-about__eco-item:hover,
  .page-about__honor-card:hover {
    transform: none;
  }
}