.page-about {
  --about-black: #111111;
  --about-navy: #0B1F3A;
  --about-navy-deep: #081625;
  --about-gold: #D4AF37;
  --about-gold-soft: #F0D27A;
  --about-paper: #F5F5F5;
  --about-orange: #FF6B35;
  --about-cyan: #00C2D1;
  --about-gray: #8A8A8A;
  --about-text-dark: #3A3A3A;

  background: var(--about-black);
  color: var(--about-paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ===== 面包屑 ===== */
.page-about .breadcrumb {
  background: var(--about-black);
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
  padding: 1rem;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  margin: 0 auto;
  padding: 0;
  max-width: var(--container-w);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--about-gold);
}

.page-about .breadcrumb-link {
  color: var(--about-gray);
  text-decoration: none;
  transition: color 150ms ease;
}

.page-about .breadcrumb-link:hover {
  color: var(--about-gold);
}

.page-about .breadcrumb-current {
  color: var(--about-gold);
  font-weight: 700;
}

/* ===== 区块标题 ===== */
.page-about .section-header {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 0 1rem;
}

.page-about .section-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--about-gold);
  letter-spacing: 0.08em;
  border: 1px solid rgba(212, 175, 55, 0.55);
  padding: 0.35em 0.7em;
  white-space: nowrap;
  grid-row: 1 / span 2;
}

.page-about .section-header h2 {
  grid-row: 1;
  grid-column: 2;
  font-family: var(--font-headline);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin: 0;
}

.page-about .section-header .section-subtitle {
  grid-row: 2;
  grid-column: 2;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--about-gray);
  margin: 0.35rem 0 0;
}

/* ===== 按钮 ===== */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background-color 150ms ease, color 150ms ease, border-color 150ms ease;
}

.page-about .btn-primary {
  background: var(--about-gold);
  border: 1px solid var(--about-gold);
  color: var(--about-black);
}

.page-about .btn-primary:hover {
  background: var(--about-gold-soft);
  border-color: var(--about-gold-soft);
}

.page-about .btn-outline {
  background: transparent;
  border: 1px solid var(--about-gold);
  color: var(--about-gold);
}

.page-about .btn-outline:hover {
  background: var(--about-gold);
  color: var(--about-black);
}

/* ===== 01 品牌简介 ===== */
.page-about .about-hero {
  position: relative;
  padding: 4rem 1rem 4.5rem;
  background: linear-gradient(160deg, var(--about-black) 0%, var(--about-black) 55%, var(--about-navy) 55.5%, var(--about-navy-deep) 100%);
  isolation: isolate;
}

.page-about .about-hero-inner {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

.page-about .about-hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--about-gold);
  margin: 0 0 1.25rem;
}

.page-about .about-hero h1 {
  font-family: var(--font-headline);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.15;
  margin: 0 0 0.75rem;
  color: var(--about-paper);
}

.page-about .about-hero-lede {
  font-family: var(--font-headline);
  font-size: 1.125rem;
  color: var(--about-gold-soft);
  margin: 0 0 1rem;
}

.page-about .about-hero-desc {
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.82);
  margin: 0 0 1.75rem;
  max-width: 38em;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero-figure {
  margin: 0;
  text-align: center;
}

.page-about .about-hero-figure .img-frame {
  border: 1px solid var(--about-gold);
  background: rgba(255, 255, 255, 0.03);
  padding: 0.5rem;
  max-width: 100%;
}

.page-about .about-hero-figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.55);
  margin-top: 0.75rem;
}

/* ===== 02 发展历程 ===== */
.page-about .about-timeline-section {
  position: relative;
  background: var(--about-paper);
  color: var(--about-black);
  padding: 4rem 1rem;
}

.page-about .about-timeline-header {
  max-width: var(--container-w);
  margin: 0 auto 2.5rem;
}

.page-about .about-timeline-header .section-subtitle {
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--about-gray);
  margin: 0.5rem 0 0 3rem;
}

.page-about .about-timeline {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0.5rem 0 0.5rem 1.5rem;
  border-left: 2px dashed rgba(212, 175, 55, 0.7);
}

.page-about .about-timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
  padding-left: 1.25rem;
}

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

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -1.7rem;
  top: 0.55rem;
  width: 0.75rem;
  height: 0.75rem;
  background: var(--about-gold);
  transform: rotate(45deg);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.18);
  transition: box-shadow 150ms ease, background-color 150ms ease;
}

.page-about .about-timeline-item:hover::before {
  background: var(--about-gold-soft);
  box-shadow: 0 0 0 5px rgba(212, 175, 55, 0.25);
}

.page-about .about-timeline-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--about-gold);
  margin-right: 0.75rem;
}

.page-about .about-timeline-extra {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--about-gray);
  vertical-align: middle;
}

.page-about .about-timeline-content h3 {
  font-family: var(--font-headline);
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0.75rem 0 0.5rem;
  color: var(--about-black);
}

.page-about .about-timeline-content p {
  font-size: 0.9125rem;
  line-height: 1.75;
  color: var(--about-text-dark);
  margin: 0;
  max-width: 60em;
}

/* ===== 03 核心数据 ===== */
.page-about .about-stats-section {
  position: relative;
  background: var(--about-navy);
  color: var(--about-paper);
  padding: 4rem 1rem;
  overflow: hidden;
}

.page-about .about-stats-section::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -20%;
  width: 60%;
  height: 80%;
  background: radial-gradient(circle at center, rgba(212, 175, 55, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-stats-section .section-header {
  max-width: var(--container-w);
  margin: 0 auto 2.5rem;
}

.page-about .about-stats-section .section-subtitle {
  color: rgba(255, 255, 255, 0.6);
}

.page-about .about-stats-grid {
  position: relative;
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.page-about .about-stats-grid .data-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(212, 175, 55, 0.28);
  padding: 1.75rem 1.25rem;
  text-align: center;
  transition: background-color 150ms ease, border-color 150ms ease, transform 150ms ease;
}

.page-about .about-stats-grid .data-card:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--about-gold);
  transform: translateY(-2px);
}

.page-about .data-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
}

.page-about .data-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.25rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--about-gold);
}

.page-about .data-unit {
  font-size: 0.5em;
  margin-left: 0.15em;
  vertical-align: super;
}

@supports (-webkit-background-clip: text) {
  .page-about .data-value {
    background: linear-gradient(90deg, var(--about-gold) 0%, var(--about-gold-soft) 50%, var(--about-gold) 100%);
    background-size: 200% 100%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: page-about-stat-flow 8s ease-in-out infinite;
  }
}

@keyframes page-about-stat-flow {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.page-about .about-stats-figure {
  position: relative;
  max-width: var(--container-w);
  margin: 2.5rem auto 0;
}

.page-about .about-stats-figure .img-frame {
  border: 1px solid rgba(240, 210, 122, 0.5);
  background: rgba(0, 0, 0, 0.12);
}

.page-about .about-stats-figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.55);
  margin-top: 0.75rem;
  text-align: right;
}

/* ===== 04 技术实力 ===== */
.page-about .about-tech-section {
  background: var(--about-paper);
  color: var(--about-black);
  padding: 4rem 1rem;
}

.page-about .about-tech-section .section-header {
  max-width: var(--container-w);
  margin: 0 auto 2.5rem;
}

.page-about .about-tech-section .section-header h2 {
  color: var(--about-black);
}

.page-about .about-tech-layout {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  gap: 2.5rem;
}

.page-about .about-tech-figure {
  margin: 0;
}

.page-about .about-tech-figure .img-frame {
  border: 1px solid var(--about-navy);
  background: var(--about-navy-deep);
}

.page-about .about-tech-figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--about-gray);
  margin-top: 0.75rem;
  text-align: center;
}

.page-about .about-tech-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-tech-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid rgba(17, 17, 17, 0.1);
}

.page-about .about-tech-list li:last-child {
  border-bottom: none;
}

.page-about .about-tech-num {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--about-gold);
  border: 1px solid rgba(212, 175, 55, 0.6);
  padding: 0.25em 0.5em;
  height: fit-content;
}

.page-about .about-tech-list h3 {
  font-family: var(--font-headline);
  font-size: 1.125rem;
  font-weight: 700;
  margin: 0 0 0.4rem;
  color: var(--about-black);
}

.page-about .about-tech-list p {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--about-text-dark);
  margin: 0;
  max-width: 55em;
}

.page-about .about-tech-note {
  max-width: var(--container-w);
  margin: 2.5rem auto 0;
  padding: 1.5rem;
  background: var(--about-black);
  color: var(--about-paper);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.page-about .about-tech-note p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
  max-width: 46em;
}

.page-about .about-tech-note .btn-outline {
  border-color: rgba(212, 175, 55, 0.8);
  color: var(--about-gold);
  white-space: nowrap;
}

.page-about .about-tech-note .btn-outline:hover {
  background: var(--about-gold);
  color: var(--about-black);
}

/* ===== 05 合作生态 ===== */
.page-about .about-partners-section {
  background: var(--about-black);
  color: var(--about-paper);
  padding: 4rem 1rem;
  border-top: 1px solid rgba(212, 175, 55, 0.25);
}

.page-about .about-partners-section .section-header {
  max-width: var(--container-w);
  margin: 0 auto 2.5rem;
}

.page-about .about-partners-section .section-subtitle {
  color: rgba(255, 255, 255, 0.6);
}

.page-about .about-partners-grid {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  gap: 1rem;
}

.page-about .about-partner-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-left: 4px solid var(--about-gold);
  padding: 2rem 1.5rem;
  transition: background-color 150ms ease, border-left-color 150ms ease, transform 150ms ease;
}

.page-about .about-partner-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-left-color: var(--about-orange);
  transform: translateX(4px);
}

.page-about .about-partner-card .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.35em 0.7em;
  margin-bottom: 1rem;
}

.page-about .about-partner-card .tag-gold {
  background: rgba(212, 175, 55, 0.15);
  border: 1px solid rgba(212, 175, 55, 0.5);
  color: var(--about-gold);
}

.page-about .about-partner-card .tag-cyan {
  background: rgba(0, 194, 209, 0.12);
  border: 1px solid rgba(0, 194, 209, 0.5);
  color: var(--about-cyan);
}

.page-about .about-partner-card .tag-orange {
  background: rgba(255, 107, 53, 0.12);
  border: 1px solid rgba(255, 107, 53, 0.5);
  color: var(--about-orange);
}

.page-about .about-partner-card h3 {
  font-family: var(--font-headline);
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 0 0.75rem;
  color: var(--about-paper);
}

.page-about .about-partner-card p {
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.65);
  margin: 0;
}

.page-about .about-partners-footer {
  max-width: var(--container-w);
  margin: 3rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.page-about .about-partners-footer p {
  margin: 0;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.7);
  max-width: 42em;
}

/* ===== 响应式桌面端 ===== */
@media (min-width: 960px) {
  .page-about .about-hero {
    background: linear-gradient(120deg, var(--about-black) 0%, var(--about-black) 45%, var(--about-navy) 45.5%, var(--about-navy-deep) 100%);
    padding: 5rem 1.5rem 6rem;
  }

  .page-about .about-hero-inner {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
  }

  .page-about .about-hero-figure .img-frame {
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
  }

  .page-about .about-hero-figure figcaption {
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
  }

  .page-about .about-timeline-section {
    padding: 5rem 1.5rem;
    background: linear-gradient(135deg, var(--about-black) 0%, var(--about-black) 26%, var(--about-paper) 26.5%);
  }

  .page-about .about-timeline-header,
  .page-about .about-timeline {
    margin-left: 30%;
  }

  .page-about .about-timeline-header {
    margin-bottom: 3rem;
  }

  .page-about .about-timeline-header .section-subtitle {
    margin-left: 3rem;
  }

  .page-about .about-timeline-item:nth-child(2) { margin-left: 1.5rem; }
  .page-about .about-timeline-item:nth-child(3) { margin-left: 3rem; }
  .page-about .about-timeline-item:nth-child(4) { margin-left: 1.5rem; }
  .page-about .about-timeline-item:nth-child(5) { margin-left: 3rem; }
  .page-about .about-timeline-item:nth-child(6) { margin-left: 1.5rem; }

  .page-about .about-timeline-extra {
    opacity: 0;
    transition: opacity 150ms ease;
  }

  .page-about .about-timeline-item:hover .about-timeline-extra,
  .page-about .about-timeline-item:focus-within .about-timeline-extra {
    opacity: 1;
  }

  .page-about .about-stats-section {
    padding: 5rem 1.5rem;
  }

  .page-about .about-stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .page-about .about-stats-figure {
    margin-top: 3rem;
    display: grid;
    justify-items: center;
  }

  .page-about .about-stats-figure .img-frame {
    max-width: 800px;
    width: 100%;
  }

  .page-about .about-tech-section {
    padding: 5rem 1.5rem;
  }

  .page-about .about-tech-layout {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
  }

  .page-about .about-partners-section {
    padding: 5rem 1.5rem;
  }

  .page-about .about-partners-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
  }
}