.page-about {
  background: var(--c-white);
}

.page-about .page-container {
  width: min(1200px, calc(100% - 40px));
  margin-inline: auto;
  padding-inline: 0;
  box-sizing: border-box;
}

.page-about .section-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .section-title {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(34px, 5.6vw, 60px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-deep);
  margin: 12px 0 18px;
}

.page-about .section-body {
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-steel);
  margin: 0;
}

/* ===== Hero / 01 我们是谁 ===== */
.page-about__hero {
  background: var(--c-deep);
  color: var(--c-white);
  padding: 36px 0 64px;
  position: relative;
  overflow: hidden;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -40px;
  width: 260px;
  height: 260px;
  border: 2px solid rgba(182, 245, 0, 0.14);
  transform: rotate(45deg);
  pointer-events: none;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 120px;
  background-image:
    linear-gradient(rgba(182, 245, 0, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(182, 245, 0, 0.07) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000);
  mask-image: linear-gradient(to bottom, transparent, #000);
  pointer-events: none;
}

.page-about__crumb {
  margin-bottom: 40px;
  color: rgba(255, 255, 255, 0.6);
  position: relative;
  z-index: 1;
}

.page-about__crumb a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
}

.page-about__crumb a:hover {
  color: var(--c-neon);
}

.page-about__hero-block {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 44px;
  align-items: center;
}

.page-about__hero-copy {
  max-width: 680px;
}

.page-about__hero .section-index {
  color: var(--c-neon);
  border-bottom: 2px solid rgba(182, 245, 0, 0.5);
  padding-bottom: 4px;
}

.page-about__hero-title {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(44px, 9vw, 96px);
  line-height: 0.92;
  letter-spacing: -0.025em;
  margin: 18px 0 24px;
}

.page-about__title-sep {
  color: var(--c-orange);
  font-weight: 100;
  padding: 0 0.08em;
}

.page-about__hero-sub {
  display: block;
  font-size: 0.46em;
  font-weight: 300;
  letter-spacing: 0.01em;
  color: var(--c-neon);
  margin-top: 0.4em;
}

.page-about__hero-desc {
  color: rgba(255, 255, 255, 0.8);
  font-size: 16px;
  line-height: 1.75;
  max-width: 46em;
  margin: 0;
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.page-about__hero-actions .btn-outline {
  border-color: rgba(255, 255, 255, 0.45);
  color: var(--c-white);
}

.page-about__hero-actions .btn-outline:hover {
  border-color: var(--c-neon);
  color: var(--c-neon);
}

.page-about__hero-media {
  position: relative;
  max-width: 520px;
}

.page-about__hero-frame {
  background: var(--c-deep-2);
  border: var(--border) solid var(--c-neon);
  box-shadow: 12px 12px 0 rgba(182, 245, 0, 0.18);
  padding: 10px;
  transform: rotate(1deg);
}

.page-about__hero-img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about__hero-est {
  position: absolute;
  right: -8px;
  bottom: -14px;
  background: var(--c-ink);
  color: var(--c-neon);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 8px 14px;
  border: 2px solid var(--c-neon);
}

/* ===== Milestones / 02 发展里程碑 ===== */
.page-about__milestones {
  background: var(--c-paper);
  padding: 72px 0 76px;
  position: relative;
  overflow: hidden;
}

.page-about__milestones::after {
  content: "";
  position: absolute;
  right: -100px;
  bottom: -100px;
  width: 320px;
  height: 320px;
  border: 2px dashed rgba(42, 75, 106, 0.16);
  transform: rotate(45deg);
  pointer-events: none;
}

.page-about__section-head {
  max-width: 720px;
  margin-bottom: 44px;
  position: relative;
  z-index: 1;
}

.page-about__section-index {
  color: var(--c-steel);
  border-bottom: 2px solid var(--c-neon);
  padding-bottom: 4px;
}

.page-about__section-lead {
  margin-bottom: 0;
}

.page-about__timeline {
  position: relative;
  z-index: 1;
  margin: 36px 0 44px;
}

.page-about__timeline-rail {
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: linear-gradient(to bottom, var(--c-neon), var(--c-steel), var(--c-orange));
  border-radius: 99px;
}

.page-about__timeline-item {
  display: grid;
  grid-template-columns: 14px 1fr;
  gap: 16px;
  margin-bottom: 26px;
  position: relative;
}

.page-about__timeline-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-neon);
  border: 3px solid var(--c-deep);
  box-shadow: 0 0 0 2px rgba(182, 245, 0, 0.18);
  justify-self: start;
  margin-top: 16px;
  transition: transform 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about__timeline-item:hover .page-about__timeline-dot,
.page-about__timeline-item:focus-within .page-about__timeline-dot {
  background: var(--c-orange);
  transform: scale(1.2);
}

.page-about__timeline-card {
  background: var(--c-white);
  border: var(--border) solid var(--c-deep);
  box-shadow: var(--shadow-hard);
  padding: 20px 22px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about__timeline-item:hover .page-about__timeline-card,
.page-about__timeline-item:focus-within .page-about__timeline-card {
  transform: translate(-3px, -3px);
  box-shadow: 13px 13px 0 rgba(11, 31, 58, 0.24);
}

.page-about__timeline-meta {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--c-orange);
  border-bottom: 2px solid var(--c-orange);
  padding-bottom: 3px;
}

.page-about__timeline-title {
  font-family: var(--font-head);
  font-size: 23px;
  font-weight: 700;
  color: var(--c-deep);
  margin: 10px 0 6px;
}

.page-about__timeline-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-steel);
  margin: 0;
}

.page-about__milestone-visual {
  margin: 0;
  background: var(--c-white);
  border: var(--border) solid var(--c-deep);
  box-shadow: var(--shadow-hard);
  padding: 10px 10px 14px;
  position: relative;
  z-index: 1;
}

.page-about__milestone-img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--c-mist);
}

.page-about__milestone-caption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-steel);
  padding-top: 10px;
}

/* ===== Tech / 03 数据与技术 ===== */
.page-about__tech {
  background: var(--c-deep);
  color: var(--c-white);
  padding: 72px 0;
  position: relative;
  overflow: hidden;
}

.page-about__tech::before {
  content: "";
  position: absolute;
  left: -60px;
  top: 120px;
  width: 220px;
  height: 220px;
  border: 2px solid rgba(255, 122, 0, 0.16);
  border-radius: 50%;
  pointer-events: none;
}

.page-about__tech::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -60px;
  width: 300px;
  height: 120px;
  background: rgba(182, 245, 0, 0.04);
  transform: rotate(-8deg);
  pointer-events: none;
}

.page-about__tech-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 44px;
  align-items: center;
}

.page-about__tech .section-index {
  color: var(--c-neon);
  border-bottom: 2px solid rgba(182, 245, 0, 0.5);
  padding-bottom: 4px;
}

.page-about__tech .section-title {
  color: var(--c-white);
}

.page-about__tech-desc {
  color: rgba(255, 255, 255, 0.76);
  font-size: 16px;
  line-height: 1.75;
  margin: 0 0 28px;
}

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

.page-about__tech-list li {
  position: relative;
  padding: 15px 0 15px 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.84);
}

.page-about__tech-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 22px;
  width: 11px;
  height: 11px;
  border: 2px solid var(--c-neon);
  transform: rotate(45deg);
  background: transparent;
}

.page-about__tech-visual {
  margin: 0;
  position: relative;
}

.page-about__tech-img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border: 3px solid var(--c-steel);
  box-shadow: 14px 14px 0 rgba(0, 0, 0, 0.22);
}

.page-about__tech-caption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.55);
  padding-top: 12px;
}

.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 52px 0 0;
  padding: 0;
  position: relative;
  z-index: 1;
}

.page-about__stat {
  background: var(--c-deep-2);
  border: 2px solid var(--c-steel);
  padding: 18px 16px;
  margin: 0;
}

.page-about__stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-neon);
  text-transform: uppercase;
}

.page-about__stat-num {
  display: block;
  font-family: var(--font-head);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-white);
  margin: 8px 0 4px;
}

.page-about__stat-desc {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
  margin: 0;
}

.page-about__chart {
  margin-top: 36px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--c-steel);
  padding: 18px 16px 12px;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 12px;
  position: relative;
  z-index: 1;
}

.page-about__chart-svg {
  width: 100%;
  max-width: 420px;
  height: auto;
  display: block;
}

.page-about__chart-caption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.55);
  max-width: 180px;
  line-height: 1.6;
}

/* ===== Commitment / 04 服务承诺 ===== */
.page-about__commitment {
  background: var(--c-white);
  padding: 72px 0 80px;
}

.page-about__commit-grid {
  display: grid;
  gap: 20px;
  margin-top: 44px;
}

.page-about__commit-card {
  background: var(--c-paper);
  border: var(--border) solid var(--c-deep);
  box-shadow: var(--shadow-hard);
  padding: 24px;
  position: relative;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about__commit-card:hover,
.page-about__commit-card:focus-within {
  transform: translate(-4px, -4px);
  box-shadow: 14px 14px 0 rgba(11, 31, 58, 0.24);
}

.page-about__commit-icon {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-neon);
  background: var(--c-deep);
  padding: 4px 12px;
}

.page-about__commit-title {
  font-family: var(--font-head);
  font-size: 23px;
  font-weight: 700;
  color: var(--c-deep);
  margin: 18px 0 10px;
}

.page-about__commit-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-steel);
  margin: 0;
}

.page-about__note {
  margin-top: 40px;
  background: var(--c-mist);
  border-left: 6px solid var(--c-orange);
  padding: 16px 20px;
}

.page-about__note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-deep);
}

.page-about__cta {
  margin-top: 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== 响应式 ===== */
@media (min-width: 720px) {
  .page-about__stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__commit-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__timeline-card {
    padding: 24px 28px;
  }
}

@media (min-width: 1024px) {
  .page-about__hero {
    padding: 56px 0 96px;
  }

  .page-about__hero-block {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 64px;
  }

  .page-about__hero-title {
    font-size: clamp(64px, 5.8vw, 104px);
  }

  .page-about__milestones,
  .page-about__tech,
  .page-about__commitment {
    padding-top: 96px;
    padding-bottom: 104px;
  }

  .page-about__tech-grid {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }

  .page-about__timeline-item {
    grid-template-columns: 18px 1fr;
    gap: 28px;
    margin-bottom: 30px;
  }

  .page-about__timeline-card {
    padding: 26px 30px;
    max-width: 920px;
  }

  .page-about__milestone-visual {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
  }
}