.page-about {
  --about-purple-glow: rgba(123, 45, 142, 0.32);
  --about-gold-glow: rgba(242, 183, 5, 0.14);
  background: var(--color-bg);
  color: var(--color-text);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: var(--sp-5) 0 var(--sp-7);
  background:
    radial-gradient(circle at 70% 8%, var(--about-purple-glow), transparent 45%),
    radial-gradient(circle at 15% 85%, var(--about-gold-glow), transparent 35%),
    linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-bg) 58%, var(--color-bg-light) 100%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--sp-6);
  align-items: center;
}

.page-about .about-hero__content h1 {
  font-family: var(--font-head);
  font-size: clamp(2.125rem, 5vw, 3.375rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: var(--sp-3) 0 var(--sp-4);
}

.page-about .about-hero__lead {
  color: var(--color-text-dim);
  font-size: 1.0625rem;
  line-height: 1.85;
  max-width: 34em;
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-5);
}

.page-about .about-hero__visual {
  clip-path: var(--clip-notch);
  background: var(--color-bg-light);
  padding: 5px;
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-3);
  margin-top: var(--sp-6);
}

.page-about .about-hero__stat {
  padding: var(--sp-4);
}

/* ===== 我们是谁 ===== */
.page-about .about-identity {
  padding-top: var(--sp-7);
  padding-bottom: var(--sp-7);
}

.page-about .about-identity__grid {
  display: grid;
  gap: var(--sp-6);
  margin-top: var(--sp-6);
}

.page-about .about-identity__head {
  margin-bottom: 0;
}

.page-about .about-identity__text p {
  margin: 0 0 var(--sp-4);
  line-height: 1.9;
  color: var(--color-text-dim);
}

.page-about .about-identity__text strong {
  color: var(--color-text);
}

.page-about .about-identity__list {
  list-style: none;
  padding: 0;
  margin: var(--sp-5) 0 0;
  display: grid;
  gap: var(--sp-3);
}

.page-about .about-identity__list li {
  position: relative;
  padding-left: var(--sp-5);
  line-height: 1.7;
  color: var(--color-text-dim);
}

.page-about .about-identity__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 14px;
  height: 2px;
  background: var(--color-action);
}

.page-about .about-identity__facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-3);
}

.page-about .about-identity__fact {
  background: linear-gradient(160deg, rgba(30, 58, 110, 0.5), rgba(6, 14, 31, 0.35));
  text-align: center;
  padding: var(--sp-5) var(--sp-4);
}

.page-about .about-identity__fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.1;
  font-weight: 700;
  color: var(--color-gold);
}

.page-about .about-identity__fact-label {
  display: block;
  margin-top: var(--sp-2);
  font-size: 0.8125rem;
  color: var(--color-text-dim);
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  padding-top: var(--sp-7);
  padding-bottom: var(--sp-7);
  background: var(--color-bg-light);
}

.page-about .about-timeline {
  position: relative;
  margin-top: var(--sp-6);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 24px;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(to bottom, var(--color-action), var(--color-purple) 50%, var(--color-gold));
  opacity: 0.4;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 48px 1fr;
  column-gap: var(--sp-4);
  padding-bottom: var(--sp-6);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__rail {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 4px;
  z-index: 1;
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-bg-dark);
  background: var(--color-gold);
  border-radius: var(--radius);
  padding: var(--sp-2) var(--sp-3);
  box-shadow: 0 0 0 4px var(--color-bg-light);
  white-space: nowrap;
  transition: background var(--dur-fast) var(--ease-fast), color var(--dur-fast) var(--ease-fast);
}

.page-about .about-timeline__body {
  min-width: 0;
}

.page-about .about-timeline__card {
  background: rgba(6, 14, 31, 0.35);
  border-left: 3px solid rgba(123, 45, 142, 0.7);
  transition: transform var(--dur-fast) var(--ease-fast), border-color var(--dur-fast) var(--ease-fast), box-shadow var(--dur-fast) var(--ease-fast);
}

.page-about .about-timeline__card h3 {
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 700;
  margin: 0 0 var(--sp-2);
}

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

.page-about .about-timeline__media {
  margin-bottom: var(--sp-3);
  clip-path: var(--clip-notch-sm);
  background: var(--color-bg-dark);
  padding: 3px;
}

.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-timeline__item:hover .about-timeline__year {
  background: var(--color-action);
}

.page-about .about-timeline__item:hover .about-timeline__card {
  border-left-color: var(--color-action);
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(6, 14, 31, 0.28);
}

/* ===== 安全承诺 ===== */
.page-about .about-security {
  padding-top: var(--sp-7);
  padding-bottom: var(--sp-7);
}

.page-about .about-security__grid {
  display: grid;
  gap: var(--sp-7);
  align-items: center;
}

.page-about .about-security__visual {
  clip-path: var(--clip-notch);
  padding: 5px;
  background: linear-gradient(135deg, var(--color-glass), rgba(123, 45, 142, 0.6), var(--color-bg-dark));
}

.page-about .about-security__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-security__content h2 {
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  line-height: 1.2;
  margin: var(--sp-3) 0 var(--sp-4);
}

.page-about .about-security__lead {
  color: var(--color-text-dim);
  line-height: 1.8;
  margin: 0 0 var(--sp-5);
}

.page-about .about-security__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--sp-4);
}

.page-about .about-security__list li {
  position: relative;
  padding-left: var(--sp-6);
  line-height: 1.75;
  color: var(--color-text-dim);
}

.page-about .about-security__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42em;
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-action);
  border-radius: 3px;
  transform: rotate(45deg);
}

.page-about .about-security__list strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ===== 本地化服务 ===== */
.page-about .about-local {
  position: relative;
  overflow: hidden;
  padding-top: var(--sp-7);
  padding-bottom: var(--sp-7);
}

.page-about .about-local::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 25% 12%, var(--about-purple-glow), transparent 55%);
  pointer-events: none;
}

.page-about .about-local__grid {
  position: relative;
  display: grid;
  gap: var(--sp-5);
  margin-top: var(--sp-6);
}

.page-about .about-local__card {
  background: rgba(30, 58, 110, 0.42);
  border-top: 2px solid var(--color-purple);
  padding: var(--sp-6);
  clip-path: var(--clip-notch);
}

.page-about .about-local__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  margin-bottom: var(--sp-4);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-bg-dark);
  background: var(--color-action);
  border-radius: 2px;
}

.page-about .about-local__card h3 {
  font-size: 1.125rem;
  margin: 0 0 var(--sp-3);
}

.page-about .about-local__card p {
  color: var(--color-text-dim);
  line-height: 1.8;
  margin: 0;
}

.page-about .about-local__status {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-3);
  margin-top: var(--sp-5);
}

/* ===== 底部行动区 ===== */
.page-about .about-cta {
  padding-top: var(--sp-6);
  padding-bottom: var(--sp-7);
}

.page-about .about-cta__panel {
  position: relative;
  border: 1px solid var(--color-glass);
  background: linear-gradient(135deg, rgba(30, 58, 110, 0.6), rgba(6, 14, 31, 0.55));
  clip-path: var(--clip-notch);
  padding: var(--sp-7) var(--sp-5);
  text-align: center;
}

.page-about .about-cta__panel::after {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 72px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-purple), var(--color-gold));
}

.page-about .about-cta__panel h2 {
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  margin: var(--sp-3) 0;
}

.page-about .about-cta__panel p {
  margin: 0 0 var(--sp-5);
  color: var(--color-text-dim);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  justify-content: center;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding-top: var(--sp-8);
    padding-bottom: var(--sp-8);
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: var(--sp-7);
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, 1fr);
    margin-top: var(--sp-7);
  }

  .page-about .about-hero__stat {
    padding: var(--sp-5);
  }

  .page-about .about-identity__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--sp-7);
    align-items: stretch;
  }

  .page-about .about-identity__facts {
    grid-template-columns: repeat(2, 1fr);
    align-content: center;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 120px 1fr;
    column-gap: var(--sp-6);
    padding-bottom: var(--sp-7);
  }

  .page-about .about-timeline::before {
    left: 60px;
  }

  .page-about .about-timeline__rail {
    padding-top: 8px;
  }

  .page-about .about-timeline__year {
    font-size: 0.9375rem;
  }

  .page-about .about-timeline__card {
    padding: var(--sp-6);
  }

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

@media (min-width: 1024px) {
  .page-about .about-security__grid {
    grid-template-columns: 0.85fr 1.15fr;
    gap: var(--sp-7);
  }

  .page-about .about-local__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--sp-5);
  }
}