.page-about {
  --about-grid-line: rgba(0, 212, 255, 0.04);
  --about-glow-blue: rgba(0, 212, 255, 0.35);
  --about-data-bg: rgba(26, 31, 46, 0.55);
}

.page-about__breadcrumb {
  padding-top: 24px;
}

/* ===== 首屏 ===== */
.page-about__hero {
  position: relative;
  padding: 40px 24px 56px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 80% 10%, rgba(0, 212, 255, 0.14), transparent 55%),
    linear-gradient(160deg, #0d1420 0%, #0a0e17 60%, #0e1420 100%);
}

.page-about__hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse at 35% 40%, #000, transparent 72%);
  mask-image: radial-gradient(ellipse at 35% 40%, #000, transparent 72%);
  pointer-events: none;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  left: -80px;
  bottom: -40px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(57, 255, 136, 0.09);
  filter: blur(32px);
  pointer-events: none;
}

.page-about__hero-deco {
  position: absolute;
  width: 360px;
  height: 360px;
  border-radius: 48px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.28), rgba(57, 255, 136, 0.06) 65%);
  transform: rotate(28deg);
  top: -140px;
  right: -80px;
  pointer-events: none;
}

.page-about__hero-deco::after {
  content: "";
  position: absolute;
  left: 40px;
  bottom: 60px;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(255, 201, 77, 0.28);
  filter: blur(28px);
}

.page-about__hero-inner {
  position: relative;
  display: grid;
  gap: 40px;
  max-width: var(--container-max);
  margin: 0 auto;
}

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

.page-about__hero .page-hero__headline {
  font-size: clamp(40px, 8vw, 68px);
  line-height: 1.08;
  margin: 16px 0 20px;
  letter-spacing: -0.03em;
}

.page-about__hero .page-hero__intro {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text-dim);
  max-width: 580px;
  margin-bottom: 32px;
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about__hero-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  padding: 28px 24px;
  background: var(--about-data-bg);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(0, 212, 255, 0.12);
  backdrop-filter: blur(6px);
}

.page-about__hero-metrics .metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about__hero-metrics .metric__value {
  font-family: var(--font-data);
  font-size: 28px;
  font-weight: 600;
  color: var(--color-accent);
}

.page-about__hero-metrics .metric__label {
  color: var(--color-text-dim);
  font-size: 13px;
}

/* ===== 品牌缘起 ===== */
.page-about__origin {
  padding: 64px 0;
  background: var(--color-bg);
}

.page-about__split {
  display: grid;
  gap: 32px;
}

.page-about__split-side {
  align-self: start;
}

.page-about__split-side h2,
.page-about__section-head h2,
.page-about__philosophy-head h2,
.page-about__tech-copy h2 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  margin: 12px 0 16px;
  letter-spacing: -0.02em;
}

.page-about__origin-signature {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.page-about__origin-signature span {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: var(--radius-pill);
  padding: 6px 12px;
}

.page-about__split-main {
  max-width: 720px;
}

.page-about__lead {
  font-size: 20px;
  line-height: 1.6;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 20px;
}

.page-about__split-main > p {
  margin-bottom: 16px;
  color: var(--color-text-dim);
  line-height: 1.75;
}

.page-about__split-main strong {
  color: var(--color-accent);
  font-weight: 600;
}

.page-about__quote {
  margin: 32px 0;
  padding: 20px 24px;
  border-left: 3px solid var(--color-accent);
  background: rgba(0, 212, 255, 0.05);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about__quote p {
  font-size: 18px;
  line-height: 1.6;
  color: var(--color-text);
  font-weight: 400;
}

.page-about__quote cite {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  font-style: normal;
  color: var(--color-text-dim);
}

/* ===== 图片 ===== */
.page-about__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.06), rgba(57, 255, 136, 0.03) 60%);
}

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

.page-about__figure--timeline {
  max-width: 800px;
  margin: 0 auto;
}

.page-about__figure--network {
  margin: 0 0 28px;
}

/* ===== 里程碑 ===== */
.page-about__milestones {
  padding: 64px 0;
  background: var(--color-bg-alt);
}

.page-about__section-head {
  max-width: 700px;
  margin-bottom: 48px;
}

.page-about__section-head p:last-child {
  color: var(--color-text-dim);
  line-height: 1.6;
}

/* ===== 时间轴 ===== */
.page-about__timeline {
  position: relative;
  max-width: 920px;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 6px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), rgba(0, 212, 255, 0.1));
  opacity: 0.55;
}

.page-about__tl-curve {
  display: none;
  position: absolute;
  left: -20px;
  top: 0;
  width: 120px;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.page-about__tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  align-items: start;
  padding-bottom: 32px;
}

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

.page-about__tl-node {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 22px var(--about-glow-blue);
  z-index: 2;
  position: relative;
  margin: 0 auto;
}

.page-about__tl-year {
  font-family: var(--font-data);
  font-size: 10px;
  font-weight: 600;
  color: var(--color-accent);
}

.page-about__tl-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: 20px;
  border: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.page-about__tl-card:hover {
  border-color: rgba(0, 212, 255, 0.25);
}

.page-about__tl-main h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
}

.page-about__tl-main p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-dim);
  margin: 0;
}

.page-about__tl-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  background: none;
  border: none;
  color: var(--color-text-dim);
  font-family: var(--font-body);
  font-size: 13px;
  cursor: pointer;
  padding: 10px 0 0;
  margin-top: 12px;
  border-top: 1px dashed var(--color-border);
  width: 100%;
  transition: color 0.2s ease;
}

.page-about__tl-trigger:hover {
  color: var(--color-accent);
}

.page-about__tl-arrow {
  font-family: var(--font-data);
  font-size: 16px;
  color: var(--color-accent);
  transition: transform 0.2s ease;
}

.page-about__tl-more {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--color-border);
}

.page-about__tl-more p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-dim);
  margin: 0;
}

/* ===== 数据能力矩阵 ===== */
.page-about__matrix {
  padding: 64px 0;
  background: var(--color-bg);
  position: relative;
}

.page-about__matrix-board {
  background: var(--about-data-bg);
  border-radius: var(--radius-lg);
  padding: 20px 0;
  border: 1px solid rgba(0, 212, 255, 0.08);
}

.page-about__matrix-primary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px 16px;
  padding: 20px;
  border-bottom: 1px dashed var(--color-border);
}

.page-about__metric-large {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
  text-align: center;
}

.page-about__gold {
  color: var(--color-gold) !important;
  font-size: 32px;
  line-height: 1.1;
}

.page-about__metric-large .metric__label {
  font-size: 12px;
}

.page-about__matrix-secondary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  padding: 20px;
}

.page-about__matrix-secondary .metric {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about__matrix-note {
  max-width: 720px;
  margin: 24px auto 0;
  color: var(--color-text-dim);
  font-size: 14px;
  line-height: 1.7;
  text-align: center;
}

.page-about__text-link {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px dashed rgba(0, 212, 255, 0.4);
  transition: border-color 0.2s ease;
}

.page-about__text-link:hover {
  border-bottom-color: var(--color-accent);
}

/* ===== 技术架构 ===== */
.page-about__tech {
  padding: 64px 0;
  background: var(--color-bg-alt);
}

.page-about__tech-grid {
  display: grid;
  gap: 32px;
}

.page-about__tech-list {
  margin: 28px 0;
}

.page-about__tech-list > div {
  padding: 16px 0;
  border-bottom: 1px dashed var(--color-border);
}

.page-about__tech-list > div:first-child {
  padding-top: 0;
}

.page-about__tech-list dt {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 16px;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.page-about__tech-list dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-text-dim);
}

.page-about__tech-badge {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== 品牌理念 ===== */
.page-about__philosophy {
  padding: 64px 0;
  background: var(--color-bg);
  position: relative;
}

.page-about__philosophy-head {
  max-width: 680px;
  margin-bottom: 48px;
}

.page-about__philosophy-head p:last-child {
  color: var(--color-text-dim);
  line-height: 1.65;
}

.page-about__principles {
  display: grid;
  gap: 20px;
}

.page-about__principle {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
  overflow: hidden;
}

.page-about__principle::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 3px;
  width: 64px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-alt));
  border-radius: 0 3px 3px 0;
}

.page-about__principle-index {
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--color-gold);
  margin-bottom: 8px;
  letter-spacing: 0.08em;
}

.page-about__principle-body h3 {
  font-size: 20px;
  margin: 0 0 8px;
}

.page-about__principle-body p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-dim);
  margin: 0;
}

.page-about__principle-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--color-text-dim);
  font-family: var(--font-body);
  font-size: 13px;
  cursor: pointer;
  padding: 12px 0 0;
  transition: color 0.2s ease;
}

.page-about__principle-toggle:hover {
  color: var(--color-accent);
}

.page-about__principle-detail {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--color-border);
}

.page-about__principle-detail p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-dim);
  margin: 0;
}

/* ===== 底部数据流 ===== */
.page-about__datastream {
  background: #060a12;
  border-top: 1px solid var(--color-border);
  overflow: hidden;
  padding: 16px 0;
}

.page-about__datastream-inner {
  display: flex;
  gap: 48px;
  white-space: nowrap;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--color-text-dim);
  animation: page-about-scroll 30s linear infinite;
  width: max-content;
}

.page-about__datastream-inner span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about__datastream-inner span::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 8px var(--color-accent);
}

@keyframes page-about-scroll {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

/* ===== 响应式 ===== */
@media (min-width: 700px) {
  .page-about__hero {
    padding: 64px 24px 72px;
  }

  .page-about__hero-metrics {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }

  .page-about__split {
    grid-template-columns: 200px 1fr;
    gap: 48px;
  }

  .page-about__split-side {
    position: sticky;
    top: 24px;
  }

  .page-about__matrix-primary,
  .page-about__matrix-secondary {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__principles {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about__hero-inner {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }

  .page-about__tl-item {
    grid-template-columns: 140px 1fr;
    gap: 28px;
  }

  .page-about__tl-node {
    width: 56px;
    height: 56px;
  }

  .page-about__tl-year {
    font-size: 13px;
  }

  .page-about__timeline::before {
    left: 69px;
  }

  .page-about__tl-curve {
    display: block;
  }

  .page-about__tech-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }
}