.page-about {
  --about-hero-fs: clamp(2.6rem, 6vw, 5rem);
  --about-year-fs: clamp(3rem, 7vw, 5.5rem);
  color: var(--c-white);
  overflow-x: hidden;
  background:
    radial-gradient(ellipse at 88% 8%, rgba(0, 229, 255, 0.07), transparent 42%),
    radial-gradient(ellipse at 6% 55%, rgba(255, 106, 0, 0.06), transparent 36%),
    radial-gradient(ellipse at 60% 90%, rgba(123, 97, 255, 0.05), transparent 40%),
    var(--c-bg);
}

/* 面包屑 */
.page-about .about-breadcrumb {
  padding-top: calc(var(--header-h) + 1.25rem);
  padding-bottom: 0.5rem;
  font-family: var(--font-accent);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-gray);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.page-about .about-breadcrumb a {
  color: var(--c-gray);
  text-decoration: none;
  transition: color var(--tr);
}
.page-about .about-breadcrumb a:hover,
.page-about .about-breadcrumb a:focus-visible {
  color: var(--c-cyan);
  outline: none;
}
.page-about .breadcrumb-sep {
  color: var(--c-orange);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--c-white);
}

/* 首屏：品牌声明 */
.page-about .about-hero {
  position: relative;
  padding: 2.5rem 0 0;
}
.page-about .about-hero-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}
.page-about .about-hero-main .kicker {
  margin-bottom: 1rem;
}
.page-about .about-hero-main h1 {
  font-family: var(--font-head);
  font-size: var(--about-hero-fs);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.015em;
  text-transform: uppercase;
  margin: 0 0 1.5rem;
  color: var(--c-white);
  text-shadow: 0 0 32px rgba(0, 229, 255, 0.18);
}
.page-about .about-hero-main .lead {
  max-width: 34em;
  color: var(--c-gray);
  font-size: 1.125rem;
  line-height: 1.75;
  margin-bottom: 0;
}
.page-about .about-hero-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: rgba(160, 178, 204, 0.16);
  border: 1px solid rgba(160, 178, 204, 0.16);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .hero-meta-item {
  background: var(--c-panel);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: background var(--tr);
}
.page-about .hero-meta-item:hover {
  background: #16233d;
}
.page-about .hero-meta-item .data-label {
  font-family: var(--font-accent);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-gray);
}
.page-about .hero-meta-item .data-value {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.1;
}
.page-about .about-hero-figure {
  margin: 2.5rem 0 0;
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  border: 1px solid rgba(0, 229, 255, 0.2);
  background: var(--c-panel);
}
.page-about .about-hero-figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}
.page-about .about-hero-figure::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(11, 18, 32, 0.12) 0%, transparent 30%, rgba(0, 229, 255, 0.08) 100%);
  pointer-events: none;
}

/* 区块标题 */
.page-about .about-section-head {
  position: relative;
  padding-left: 1rem;
  border-left: 4px solid var(--c-orange);
  margin-bottom: 2.5rem;
}
.page-about .about-section-head h2 {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 3.6vw, 2.8rem);
  font-weight: 700;
  line-height: 1.1;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  margin: 0.4rem 0 0.6rem;
  color: var(--c-white);
}
.page-about .section-note {
  font-family: var(--font-accent);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-orange);
  margin: 0;
}

/* 平台定位 */
.page-about .about-position {
  padding-top: 4.5rem;
}
.page-about .about-position-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}
.page-about .about-position .text-block p {
  color: var(--c-gray);
  line-height: 1.85;
  margin: 0 0 1.25rem;
}
.page-about .about-position-cards {
  display: grid;
  gap: 1.25rem;
}
.page-about .position-card {
  position: relative;
  padding: 1.75rem;
  background: var(--c-panel);
  border: 1px solid rgba(160, 178, 204, 0.14);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--tr), border-color var(--tr), box-shadow var(--tr);
}
.page-about .position-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}
.page-about .position-card .data-line {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.6rem;
}
.page-about .position-card .data-value {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-cyan);
}
.page-about .position-card p {
  color: var(--c-gray);
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 发展轨迹：时间轴 */
.page-about .about-timeline {
  padding-top: 5rem;
}
.page-about .timeline-wrap {
  position: relative;
  margin-top: 3.5rem;
}
.page-about .timeline-wrap::before {
  content: '';
  position: absolute;
  left: 1rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-orange) 0%, var(--c-cyan) 55%, rgba(0, 229, 255, 0.2) 100%);
}
.page-about .timeline-item {
  position: relative;
  padding-left: 2.5rem;
  padding-bottom: 3.5rem;
}
.page-about .timeline-item::before {
  content: '';
  position: absolute;
  left: 0.56rem;
  top: 0.5rem;
  width: 0.88rem;
  height: 0.88rem;
  border-radius: 50%;
  background: var(--c-bg);
  border: 3px solid var(--c-cyan);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.45);
}
.page-about .timeline-year {
  display: block;
  font-family: var(--font-head);
  font-size: clamp(2.2rem, 8vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  margin-bottom: 0.8rem;
  background: linear-gradient(135deg, var(--c-white) 20%, var(--c-cyan) 80%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.page-about .timeline-card {
  background: rgba(17, 28, 51, 0.8);
  border: 1px solid rgba(160, 178, 204, 0.16);
  padding: 1.5rem;
  transition: border-color var(--tr), transform var(--tr), box-shadow var(--tr);
}
.page-about .timeline-card:hover {
  border-color: rgba(0, 229, 255, 0.45);
  transform: translateX(4px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}
.page-about .timeline-tag {
  display: inline-block;
  font-family: var(--font-accent);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--c-orange);
  background: rgba(255, 106, 0, 0.08);
  border: 1px solid rgba(255, 106, 0, 0.3);
  border-radius: 999px;
  padding: 0.22rem 0.65rem;
  margin-bottom: 0.8rem;
}
.page-about .timeline-card h3 {
  font-family: var(--font-head);
  font-size: 1.45rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  color: var(--c-white);
}
.page-about .timeline-card p {
  color: var(--c-gray);
  line-height: 1.7;
  margin: 0;
  font-size: 0.95rem;
}
.page-about .timeline-footnote {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: center;
  color: var(--c-gray);
  font-size: 0.875rem;
  margin: 0.5rem 0 0;
  padding-left: 2.5rem;
}
.page-about .timeline-footnote a {
  color: var(--c-cyan);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--tr);
}
.page-about .timeline-footnote a:hover,
.page-about .timeline-footnote a:focus-visible {
  color: var(--c-orange);
  outline: none;
}

/* 数据与技术 */
.page-about .about-tech {
  padding-top: 5rem;
}
.page-about .about-tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}
.page-about .about-tech-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
.page-about .tech-feature {
  background: var(--c-panel);
  border-left: 4px solid var(--c-cyan);
  border-radius: 4px 0 0 4px;
  padding: 1.25rem 1.5rem;
  transition: background var(--tr), border-color var(--tr);
}
.page-about .tech-feature:hover {
  background: #14203a;
  border-left-color: var(--c-orange);
}
.page-about .tech-feature .data-label {
  font-family: var(--font-accent);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-gray);
}
.page-about .tech-num {
  display: block;
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.1;
  margin: 0.25rem 0 0.5rem;
  background: linear-gradient(135deg, var(--c-white), var(--c-cyan));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.page-about .tech-feature p {
  color: var(--c-gray);
  line-height: 1.65;
  margin: 0;
  font-size: 0.95rem;
}
.page-about .about-tech-image {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(0, 229, 255, 0.22);
  background: var(--c-panel);
  position: relative;
}
.page-about .about-tech-image img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}
.page-about .about-tech-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, transparent 60%, rgba(0, 229, 255, 0.08));
  pointer-events: none;
}

/* 资质与荣誉 */
.page-about .about-cert {
  padding-top: 5rem;
}
.page-about .about-cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
.page-about .cert-item {
  background: var(--c-panel);
  padding: 1.75rem;
  position: relative;
  border: 1px solid rgba(160, 178, 204, 0.14);
  transition: border-color var(--tr), transform var(--tr), box-shadow var(--tr);
}
.page-about .cert-item:hover {
  border-color: rgba(123, 97, 255, 0.5);
  transform: translateY(-4px);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.35);
}
.page-about .cert-num {
  font-family: var(--font-accent);
  font-size: 0.8rem;
  color: var(--c-violet);
  letter-spacing: 0.12em;
}
.page-about .cert-item h3 {
  font-family: var(--font-head);
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0.5rem 0 0.5rem;
  color: var(--c-white);
}
.page-about .cert-item p {
  color: var(--c-gray);
  line-height: 1.65;
  margin: 0;
  font-size: 0.92rem;
}

/* 服务理念 */
.page-about .about-philosophy {
  padding-top: 5rem;
}
.page-about .about-philosophy-inner {
  background:
    linear-gradient(135deg, rgba(17, 28, 51, 0.9), rgba(11, 18, 32, 0.95)),
    var(--c-panel);
  padding: 2.5rem 1.5rem;
  position: relative;
  overflow: hidden;
}
.page-about .philosophy-scanline {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--c-orange), var(--c-cyan), transparent);
  animation: about-scan 3s ease-in-out infinite alternate;
}
@keyframes about-scan {
  from {
    transform: translateX(-20%);
    opacity: 0.6;
  }
  to {
    transform: translateX(20%);
    opacity: 1;
  }
}
.page-about .philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  position: relative;
  z-index: 1;
}
.page-about .philosophy-content .kicker {
  color: var(--c-orange);
}
.page-about .philosophy-content h2 {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 3.6vw, 2.8rem);
  font-weight: 700;
  text-transform: uppercase;
  line-height: 1.1;
  margin: 0.4rem 0 1rem;
  color: var(--c-white);
}
.page-about .philosophy-content .lead {
  color: var(--c-gray);
  line-height: 1.75;
  font-size: 1.05rem;
  margin-bottom: 0;
}
.page-about .philosophy-photo {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(255, 106, 0, 0.25);
  align-self: center;
}
.page-about .philosophy-photo img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}
.page-about .philosophy-points {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2rem;
  position: relative;
  z-index: 1;
}
.page-about .point-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(160, 178, 204, 0.12);
  padding: 1.25rem;
  border-radius: 4px;
  transition: border-color var(--tr), background var(--tr);
}
.page-about .point-item:hover {
  border-color: rgba(0, 229, 255, 0.4);
  background: rgba(0, 229, 255, 0.04);
}
.page-about .point-num {
  font-family: var(--font-accent);
  font-size: 0.85rem;
  color: var(--c-cyan);
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.25);
  min-width: 2.2rem;
  height: 2.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 2px;
}
.page-about .point-text h3 {
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 0.3rem;
  color: var(--c-white);
}
.page-about .point-text p {
  color: var(--c-gray);
  font-size: 0.92rem;
  line-height: 1.6;
  margin: 0;
}
.page-about .philosophy-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
  position: relative;
  z-index: 1;
}

/* 平板与桌面 */
@media (min-width: 900px) {
  .page-about .about-hero-top {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: end;
  }
  .page-about .about-hero-meta {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-position-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 4rem;
    align-items: start;
  }
  .page-about .about-position-cards {
    grid-template-columns: 1fr 1fr;
  }

  /* 时间轴桌面版 */
  .page-about .timeline-wrap::before {
    left: calc(12.5rem - 1px);
  }
  .page-about .timeline-item {
    display: grid;
    grid-template-columns: 10rem 3rem minmax(0, 1fr);
    gap: 1rem;
    padding-left: 0;
    padding-bottom: 4rem;
  }
  .page-about .timeline-item::before {
    left: calc(12.5rem - 0.4375rem);
    top: 0.65rem;
  }
  .page-about .timeline-year {
    font-size: clamp(3rem, 5.5vw, 5rem);
    text-align: right;
    margin-bottom: 0;
    padding-top: 0.2rem;
  }
  .page-about .timeline-card {
    max-width: 520px;
  }
  .page-about .timeline-footnote {
    padding-left: 13.5rem;
  }

  .page-about .about-tech-grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 4rem;
    align-items: center;
  }
  .page-about .about-tech-content {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .about-cert-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  .page-about .about-philosophy-inner {
    padding: 3.5rem 3rem;
  }
  .page-about .philosophy-grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
  }
  .page-about .philosophy-points {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }
  .page-about .philosophy-cta {
    gap: 1rem;
  }
}