.page-about {
  --about-blue: var(--blue);
  --about-lime: var(--lime);
  --about-orange: var(--orange);
  --about-card: var(--bg-card-grad);
  --about-panel: var(--bg-panel);
  position: relative;
  background: var(--bg-deep);
  color: var(--text-main);
  overflow-x: hidden;
}

/* ===== 通用容器 ===== */
.page-about .about-inner {
  max-width: 1180px;
  margin-inline: auto;
}

/* ===== 首屏导语区 ===== */
.page-about .about-hero {
  position: relative;
  padding: clamp(2.75rem, 7vw, 5.5rem) var(--space-page) clamp(2rem, 5vw, 3.5rem);
  background:
    radial-gradient(ellipse at 78% 18%, rgba(0, 194, 255, 0.16), transparent 52%),
    radial-gradient(ellipse at 8% 88%, rgba(212, 255, 0, 0.08), transparent 44%),
    var(--bg-deep);
}

.page-about .about-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  max-width: 1180px;
  margin: 0 auto 2.5rem;
  font-size: 0.875rem;
  color: var(--text-dim);
}

.page-about .about-breadcrumb a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.page-about .about-breadcrumb-sep {
  color: rgba(245, 248, 255, 0.2);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 2.25rem;
  max-width: 1180px;
  margin-inline: auto;
}

.page-about .about-hero-copy {
  max-width: 720px;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1.25rem;
  padding: 0.35rem 0.8rem;
  border: 1px solid rgba(0, 194, 255, 0.45);
  border-radius: 999px;
  color: var(--blue);
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 1.25rem;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5.2vw, 3.35rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

.page-about .about-hero-lead {
  margin: 0 0 1.75rem;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
}

.page-about .about-hero-meta {
  display: grid;
  gap: 1rem;
}

.page-about .about-meta-panel {
  position: relative;
  padding: 1.1rem 1.25rem;
  border-left: 3px solid var(--blue);
  border-radius: var(--radius-md);
  background: var(--about-card);
  box-shadow: var(--shadow-panel);
}

.page-about .about-meta-panel .panel-title {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--text-dim);
  font-size: 0.8125rem;
  line-height: 1.4;
}

.page-about .about-meta-panel .panel-value {
  display: block;
  font-family: var(--font-data);
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--lime);
}

.page-about .about-meta-panel .panel-meta {
  display: block;
  margin-top: 0.4rem;
  color: var(--text-dim);
  font-size: 0.8125rem;
  line-height: 1.45;
}

/* ===== 章节通用 ===== */
.page-about .about-section {
  position: relative;
  padding: clamp(3.5rem, 8vw, 6.5rem) var(--space-page);
}

.page-about .about-section-head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 2rem;
}

.page-about .about-section-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid rgba(212, 255, 0, 0.4);
  border-radius: 50%;
  color: var(--lime);
  font-family: var(--font-data);
  font-size: 0.875rem;
  font-weight: 600;
}

.page-about .about-section-head h2 {
  margin: 0 0 0.4rem;
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3.4vw, 2.25rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .about-section-sub {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.9375rem;
}

/* ===== 01 出发点 ===== */
.page-about .about-origin-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.page-about .about-origin-copy p {
  margin: 0 0 1rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-origin-copy p:last-of-type {
  margin-bottom: 0;
}

.page-about .about-point-list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.page-about .about-point-list li {
  position: relative;
  padding-left: 1.6rem;
  color: var(--text-main);
  line-height: 1.55;
  font-size: 0.9375rem;
}

.page-about .about-point-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 3px;
  background: var(--lime);
}

.page-about .about-origin-media {
  overflow: hidden;
  margin: 0;
  border-radius: var(--radius-lg);
  background: var(--bg-panel);
  box-shadow: var(--shadow-panel);
}

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

.page-about .about-origin-media .media-note {
  display: block;
  padding: 0.75rem 1rem 1rem;
  color: var(--text-dim);
  font-size: 0.8125rem;
}

/* ===== 02 时间轴 ===== */
.page-about .about-journey {
  background:
    linear-gradient(115deg, rgba(0, 194, 255, 0.05), transparent 42%),
    var(--bg-deep);
}

.page-about .about-timeline-wrap {
  position: relative;
  max-width: 860px;
}

.page-about .about-timeline-svg {
  position: absolute;
  left: 5px;
  top: 0.25rem;
  bottom: 0.25rem;
  width: 30px;
  height: auto;
  z-index: 0;
  overflow: visible;
  pointer-events: none;
}

.page-about .about-timeline-path {
  fill: none;
  stroke: var(--blue);
  stroke-width: 2.5;
  stroke-dasharray: 6 8;
  stroke-linecap: round;
  opacity: 0.55;
  vector-effect: non-scaling-stroke;
}

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

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 1.75rem 3.9rem;
}

.page-about .about-timeline-item:last-child {
  padding-bottom: 0.25rem;
}

.page-about .about-timeline-dot {
  position: absolute;
  left: 0.625rem;
  top: 0.3rem;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 3px solid var(--blue);
  box-shadow: 0 0 0 5px rgba(0, 194, 255, 0.14);
}

.page-about .about-timeline-card {
  padding: 1.25rem 1.375rem;
  border: 1px solid rgba(245, 248, 255, 0.12);
  border-radius: var(--radius-md);
  background: var(--about-card);
  box-shadow: var(--shadow-panel);
  transition: border-color 0.3s cubic-bezier(0.22, 1, 0.36, 1), transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.page-about .about-timeline-item:hover .about-timeline-card,
.page-about .about-timeline-item:focus-within .about-timeline-card {
  border-color: rgba(0, 194, 255, 0.55);
  transform: translateY(-3px);
}

.page-about .about-timeline-phase {
  display: inline-block;
  margin-bottom: 0.6rem;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: rgba(212, 255, 0, 0.12);
  color: var(--lime);
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.page-about .about-timeline-card h3 {
  margin: 0 0 0.55rem;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-timeline-card > p {
  margin: 0 0 0.85rem;
  color: var(--text-dim);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.page-about .about-journey-expand {
  margin-top: 0.75rem;
}

.page-about .about-journey-expand .expand-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0;
  background: none;
  border: 0;
  color: var(--blue);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  cursor: pointer;
}

.page-about .about-journey-expand .expand-content {
  margin-top: 0.5rem;
  color: var(--text-dim);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* ===== 03 服务边界 ===== */
.page-about .about-service {
  padding: 0;
  overflow: hidden;
}

.page-about .about-bg-cover {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  border-radius: inherit;
}

.page-about .about-bg-cover img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 100%;
  object-fit: cover;
  opacity: 0.32;
}

.page-about .about-service-inner {
  position: relative;
  z-index: 1;
  padding: clamp(3.5rem, 8vw, 6rem) var(--space-page);
}

.page-about .about-service-grid {
  display: grid;
  gap: 1rem;
}

.page-about .about-service-card {
  position: relative;
  padding: 1.375rem;
  border: 1px solid rgba(245, 248, 255, 0.12);
  border-radius: var(--radius-lg);
  background: rgba(20, 28, 40, 0.82);
  box-shadow: var(--shadow-panel);
  transition: border-color 0.3s cubic-bezier(0.22, 1, 0.36, 1), transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.page-about .about-service-card:hover {
  transform: translateY(-4px);
  border-color: rgba(212, 255, 0, 0.5);
}

.page-about .about-service-index {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--lime);
  font-family: var(--font-data);
  font-size: 0.8125rem;
  font-weight: 600;
}

.page-about .about-service-card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 800;
}

.page-about .about-service-card p {
  margin: 0 0 1rem;
  color: var(--text-dim);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.page-about .about-service-link {
  color: var(--blue);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: color 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.page-about .about-service-link:hover {
  color: var(--lime);
}

.page-about .about-service-card-download {
  border-color: rgba(0, 194, 255, 0.28);
}

/* ===== 04 品牌标签 ===== */
.page-about .about-brandtag {
  padding: 0;
  overflow: hidden;
}

.page-about .about-brandtag-inner {
  position: relative;
  z-index: 1;
  display: grid;
  justify-items: start;
  padding: clamp(3.5rem, 8vw, 6rem) var(--space-page);
}

.page-about .about-brandtag-card {
  width: min(720px, 100%);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid rgba(212, 255, 0, 0.22);
  border-radius: var(--radius-lg);
  background: rgba(11, 15, 26, 0.82);
  box-shadow: var(--shadow-panel);
}

.page-about .about-brandtag-card .about-section-head {
  margin-bottom: 1.25rem;
}

.page-about .about-brandtag-card > p {
  margin: 0 0 0.85rem;
  color: var(--text-dim);
  line-height: 1.7;
}

.page-about .about-brandtag-list {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.625rem;
}

.page-about .about-brandtag-list li {
  position: relative;
  padding-left: 1.45rem;
  color: var(--text-dim);
  font-size: 0.9375rem;
  line-height: 1.55;
}

.page-about .about-brandtag-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 2px;
  background: var(--lime);
  transform: skew(-8deg);
}

.page-about .about-brandtag-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
  margin-top: 1.5rem;
}

/* ===== 尾部 CTA ===== */
.page-about .about-cta {
  padding: calc(var(--space-page) * 1.6) var(--space-page);
  background:
    linear-gradient(135deg, rgba(0, 194, 255, 0.1), transparent 60%),
    var(--bg-deep);
  border-top: 1px solid rgba(245, 248, 255, 0.12);
}

.page-about .about-cta-inner {
  max-width: 760px;
  margin-inline: auto;
  text-align: center;
}

.page-about .about-cta-label {
  margin: 0 0 0.5rem;
  color: var(--blue);
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-about .about-cta h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3.8vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about .about-cta-inner p {
  max-width: 600px;
  margin: 0 auto 1.5rem;
  color: var(--text-dim);
  line-height: 1.7;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.875rem;
}

/* ===== 桌面端 ===== */
@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(260px, 0.7fr);
    align-items: end;
    gap: 3rem;
  }

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

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 3.5rem;
  }

  .page-about .about-service-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .about-brandtag-inner {
    justify-items: end;
  }

  .page-about .about-brandtag-card {
    width: min(680px, 56%);
    margin-right: 5%;
  }
}

@media (min-width: 1200px) {
  .page-about .about-service-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-section-head {
    margin-bottom: 2.75rem;
  }
}