.page-about {
  --about-accent: #FF6B00;
  --about-purple: #9B30FF;
  --about-cyan: #00B4D8;
  --about-panel: #1A1A2E;
  --about-line: rgba(255, 255, 255, 0.08);
  --about-line-bright: rgba(155, 48, 255, 0.35);
  background: var(--bg-deep);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

/* ========== 页面头部区 ========== */
.page-about .about-doc-head {
  position: relative;
  padding: 56px 0 40px;
  background:
    linear-gradient(var(--about-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-line) 1px, transparent 1px);
  background-size: 40px 40px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-doc-head::after {
  content: '';
  position: absolute;
  right: -60px;
  bottom: -20px;
  width: 320px;
  height: 60px;
  background: linear-gradient(90deg, rgba(255, 107, 0, 0.25), rgba(155, 48, 255, 0.25));
  transform: skewX(-18deg);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .breadcrumb {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 32px;
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--about-accent);
}

.page-about .breadcrumb-sep {
  margin: 0 8px;
  color: var(--about-line-bright);
}

.page-about .about-head-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.page-about .about-head-main .section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--about-cyan);
  margin-bottom: 16px;
  padding: 4px 12px;
  border: 1px solid rgba(0, 180, 216, 0.35);
  text-transform: uppercase;
}

.page-about .about-head-main .display-title {
  font-family: var(--font-head);
  font-size: 36px;
  line-height: 1.15;
  font-weight: 900;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}

.page-about .about-head-main .display-title::after {
  content: '';
  display: block;
  width: 72px;
  height: 6px;
  margin-top: 20px;
  background: linear-gradient(90deg, var(--about-accent), var(--about-purple));
  transform: skewX(-18deg);
}

.page-about .about-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--gray);
  max-width: 560px;
  margin: 0;
}

.page-about .about-head-aside img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--about-line-bright);
  padding: 8px;
  background: var(--about-panel);
  box-shadow: 12px 12px 0 rgba(0, 0, 0, 0.35);
}

/* ========== 通用标题区样式 ========== */
.page-about .about-section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 36px;
  position: relative;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .section-index {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--about-accent);
  letter-spacing: 0.08em;
}

.page-about .about-section-head h2 {
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 900;
  margin: 0;
  letter-spacing: -0.01em;
}

.page-about .about-section-head .vertical-note {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.16em;
  writing-mode: vertical-rl;
  height: 48px;
  line-height: 48px;
  border-left: 1px solid var(--about-line);
  padding-left: 8px;
}

/* ========== 品牌起源 ========== */
.page-about .about-origin {
  padding: 72px 0 56px;
  position: relative;
}

.page-about .about-origin::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--about-accent), transparent 60%);
  opacity: 0.4;
}

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-origin-text {
  background: var(--about-panel);
  padding: 28px;
  position: relative;
  border-left: 3px solid var(--about-accent);
  box-shadow:
    6px 6px 0 rgba(255, 107, 0, 0.08),
    12px 12px 0 rgba(155, 48, 255, 0.06);
}

.page-about .about-origin-text::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--about-accent), transparent 70%);
}

.page-about .about-origin-text p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--gray);
  margin: 0 0 16px;
}

.page-about .about-origin-text p:last-child {
  margin-bottom: 0;
}

.page-about .about-origin-text .origin-first {
  font-size: 17px;
  color: var(--white);
  font-weight: 500;
}

.page-about .about-origin-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.page-about .about-meta-item {
  background: rgba(26, 26, 46, 0.7);
  padding: 20px 16px;
  border: 1px solid var(--about-line);
  position: relative;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-meta-item:hover {
  border-color: var(--about-line-bright);
  transform: translateY(-2px);
}

.page-about .about-meta-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--about-accent);
  line-height: 1.2;
  margin-bottom: 8px;
}

.page-about .about-meta-label {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.page-about .about-meta-note {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--about-cyan);
  padding: 12px 16px;
  border: 1px dashed rgba(0, 180, 216, 0.35);
  line-height: 1.6;
}

/* ========== 发展里程碑 ========== */
.page-about .about-milestones {
  padding: 48px 0 72px;
  position: relative;
  background:
    linear-gradient(90deg, transparent 0%, rgba(155, 48, 255, 0.06) 100%);
}

.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 28px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--about-line-bright) 10%, var(--about-line-bright) 90%, transparent);
}

.page-about .timeline-node {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  position: relative;
  margin-bottom: 24px;
}

.page-about .timeline-coord {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-about .timeline-coord a {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--about-cyan);
  text-decoration: none;
  background: var(--bg-deep);
  padding: 4px 6px;
  border: 1px solid rgba(0, 180, 216, 0.3);
  white-space: nowrap;
  position: relative;
  z-index: 2;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .timeline-coord a:hover {
  background: var(--about-accent);
  color: #000;
  border-color: var(--about-accent);
}

.page-about .coord-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 3px solid var(--about-accent);
  position: absolute;
  top: 34px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}

.page-about .timeline-content {
  background: rgba(26, 26, 46, 0.6);
  padding: 24px;
  position: relative;
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--about-accent);
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .timeline-node:hover .timeline-content {
  background: rgba(26, 26, 46, 0.85);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.3);
}

.page-about .timeline-phase {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  background: var(--about-accent);
  color: #000;
  padding: 4px 14px;
  transform: skewX(-12deg);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
  position: relative;
  z-index: 0;
}

.page-about .timeline-phase::before {
  content: '';
  position: absolute;
  inset: 0;
  background: inherit;
  z-index: -1;
}

.page-about .timeline-content h3 {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 800;
  margin: 0 0 10px;
  line-height: 1.4;
}

.page-about .timeline-content p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--gray);
  margin: 0 0 12px;
}

.page-about .timeline-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--about-purple);
  border: 1px solid rgba(155, 48, 255, 0.3);
  padding: 3px 10px;
  letter-spacing: 0.06em;
}

/* 横坐标刻度线 */
.page-about .timeline-content::after {
  content: '';
  position: absolute;
  left: -20px;
  top: 40px;
  width: 18px;
  height: 1px;
  background: var(--about-line-bright);
}

/* ========== 技术能力 ========== */
.page-about .about-tech {
  padding: 56px 0 72px;
  border-top: 1px solid var(--about-line);
  position: relative;
}

.page-about .about-tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-tech-visual img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--about-line-bright);
  padding: 6px;
  background: var(--bg-black);
}

.page-about .tech-visual-caption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
  margin: 10px 0 0;
  border-left: 2px solid var(--about-purple);
  padding-left: 12px;
}

.page-about .about-tech-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .tech-item {
  background: rgba(26, 26, 46, 0.55);
  padding: 20px;
  border: 1px solid var(--about-line);
  position: relative;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .tech-item:hover {
  border-color: var(--about-line-bright);
  transform: translateX(4px);
}

.page-about .tech-index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--about-accent);
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 6px;
}

.page-about .tech-item h3 {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 8px;
}

.page-about .tech-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray);
  margin: 0;
}

/* ========== 数据规模 ========== */
.page-about .about-data {
  padding: 56px 0 72px;
  border-top: 1px solid var(--about-line);
  background:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
}

.page-about .about-data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-data-chart img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--about-line);
  background: var(--bg-black);
}

.page-about .data-chart-caption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
  margin: 10px 0 0;
  border-left: 2px solid var(--about-cyan);
  padding-left: 12px;
}

.page-about .about-data-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .data-stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(10, 14, 39, 0.92);
  padding: 16px 20px;
  transition: background-color 0.2s ease;
}

.page-about .data-stat-row:hover {
  background: rgba(26, 26, 46, 0.92);
}

.page-about .data-stat-label {
  font-size: 14px;
  color: var(--gray);
  letter-spacing: 0.04em;
}

.page-about .data-stat-value {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--about-accent);
}

.page-about .data-stat-row:nth-child(2n) .data-stat-value {
  color: var(--about-cyan);
}

.page-about .data-stat-row:nth-child(3n) .data-stat-value {
  color: var(--gold);
}

/* ========== 荣誉与资质 ========== */
.page-about .about-honors {
  padding: 56px 0 72px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-honor-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .honor-card {
  background: rgba(26, 26, 46, 0.6);
  padding: 28px 24px;
  border: 1px solid var(--about-line);
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .honor-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--about-accent), var(--about-purple));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.page-about .honor-card:hover {
  border-color: var(--about-line-bright);
  transform: translateY(-4px);
}

.page-about .honor-card:hover::before {
  transform: scaleX(1);
}

.page-about .honor-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  color: var(--about-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 107, 0, 0.3);
  background: rgba(255, 107, 0, 0.08);
  transform: skewX(-8deg);
}

.page-about .honor-icon svg {
  width: 24px;
  height: 24px;
}

.page-about .honor-card:nth-child(2) .honor-icon {
  color: var(--about-cyan);
  border-color: rgba(0, 180, 216, 0.3);
  background: rgba(0, 180, 216, 0.08);
}

.page-about .honor-card:nth-child(3) .honor-icon {
  color: var(--gold);
  border-color: rgba(255, 215, 0, 0.3);
  background: rgba(255, 215, 0, 0.08);
}

.page-about .honor-card h3 {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 10px;
}

.page-about .honor-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray);
  margin: 0;
}

/* ========== CTA区 ========== */
.page-about .about-cta {
  padding: 56px 0 80px;
  position: relative;
}

.page-about .about-cta::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  background: linear-gradient(120deg, rgba(255, 107, 0, 0.08), transparent 40%, rgba(155, 48, 255, 0.08));
  pointer-events: none;
}

.page-about .about-cta-inner {
  position: relative;
  border: 1px solid var(--about-line);
  background: rgba(26, 26, 46, 0.6);
  padding: 48px 32px;
  text-align: center;
  clip-path: polygon(0 0, 100% 8%, 100% 100%, 0 92%);
}

.page-about .about-cta-inner .section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--about-cyan);
  margin-bottom: 12px;
  border: 1px solid rgba(0, 180, 216, 0.35);
  padding: 4px 14px;
}

.page-about .about-cta-inner h2 {
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 900;
  margin: 0 0 12px;
}

.page-about .about-cta-inner p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray);
  max-width: 520px;
  margin: 0 auto 28px;
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

.page-about .about-cta-links .btn {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  padding: 12px 28px;
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-cta-links .btn:hover {
  transform: translateY(-2px);
}

.page-about .about-cta-links .btn-primary {
  background: var(--about-accent);
  color: #000;
  border: 1px solid var(--about-accent);
  transform: skewX(-8deg);
}

.page-about .about-cta-links .btn-primary:hover {
  box-shadow: 0 6px 20px rgba(255, 107, 0, 0.35);
}

/* ========== 桌面端 ≥ 900px ========== */
@media (min-width: 900px) {
  .page-about .about-doc-head {
    padding: 80px 0 56px;
  }

  .page-about .about-doc-head .display-title {
    font-size: 48px;
  }

  .page-about .about-head-grid {
    grid-template-columns: 1.2fr 1fr;
    gap: 48px;
  }

  .page-about .about-head-aside img {
    padding: 12px;
    box-shadow: 16px 16px 0 rgba(0, 0, 0, 0.35);
  }

  .page-about .about-origin {
    padding: 96px 0 80px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: 2fr 1fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-origin-text {
    padding: 40px;
  }

  .page-about .about-origin-meta {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .page-about .about-meta-note {
    grid-column: auto;
  }

  .page-about .about-section-head h2 {
    font-size: 34px;
  }

  .page-about .about-timeline::before {
    left: 44px;
  }

  .page-about .timeline-node {
    grid-template-columns: 88px 1fr;
    gap: 32px;
    margin-bottom: 32px;
  }

  .page-about .timeline-coord a {
    font-size: 13px;
    padding: 6px 10px;
  }

  .page-about .coord-dot {
    top: 40px;
    width: 14px;
    height: 14px;
  }

  .page-about .timeline-content {
    padding: 32px;
  }

  .page-about .timeline-content h3 {
    font-size: 21px;
  }

  .page-about .timeline-content p {
    font-size: 15px;
  }

  .page-about .about-tech {
    padding: 80px 0 96px;
  }

  .page-about .about-tech-grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-tech-visual img {
    padding: 12px;
  }

  .page-about .about-tech-list {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-about .tech-item {
    padding: 24px;
  }

  .page-about .about-data {
    padding: 80px 0 96px;
  }

  .page-about .about-data-grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .data-stat-value {
    font-size: 24px;
  }

  .page-about .about-honors {
    padding: 80px 0 96px;
  }

  .page-about .about-honor-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .honor-card {
    padding: 36px 28px;
  }

  .page-about .about-cta {
    padding: 80px 0 100px;
  }

  .page-about .about-cta-inner {
    padding: 72px 48px;
  }

  .page-about .about-cta-inner h2 {
    font-size: 34px;
  }
}