.page-about {
  --about-rail: 260px;
  overflow-x: hidden;
}

/* ===== 首屏：品牌概况索引 ===== */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 72px;
  background:
    radial-gradient(680px 260px at 82% 8%, rgba(123, 47, 234, 0.26), transparent 68%),
    linear-gradient(180deg, rgba(11, 16, 38, 0.5), rgba(11, 16, 38, 0));
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -140px;
  top: 0;
  bottom: 0;
  width: 420px;
  background: repeating-linear-gradient(-55deg, transparent 0 14px, rgba(46, 58, 94, 0.16) 14px 15px);
  clip-path: polygon(34% 0, 100% 0, 88% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
  padding-top: 36px;
}

.page-about .about-hero__side {
  display: flex;
  align-items: center;
  gap: 16px;
}

.page-about .about-hero__no {
  font-family: var(--font-mono);
  font-size: 56px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.06em;
  color: var(--color-purple-soft);
}

.page-about .about-hero__tag {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--color-muted);
  border-left: 1px solid var(--color-line);
  padding-left: 16px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--color-neon);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: var(--fs-display);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--color-light);
}

.page-about .about-hero__lead {
  max-width: 560px;
  margin: 0 0 28px;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--color-muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ===== 章节通用索引 ===== */
.page-about .section-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 28px;
  padding: 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  font-weight: 700;
  color: var(--color-purple-soft);
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-purple);
}

.page-about .section-title {
  margin: 14px 0 6px;
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.25;
  color: var(--color-light);
}

.page-about .section-desc {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  color: var(--color-muted);
  letter-spacing: 0.08em;
}

/* ===== 品牌简介 ===== */
.page-about .about-intro {
  border-top: 1px solid var(--color-line);
}

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

.page-about .about-intro__rail {
  border-left: 2px solid var(--color-purple);
  padding-left: 18px;
}

.page-about .about-intro__main {
  display: grid;
  gap: 36px;
}

.page-about .about-intro__copy {
  display: grid;
  gap: 18px;
}

.page-about .about-intro__copy p {
  margin: 0;
  color: var(--color-muted);
  line-height: 1.8;
  font-size: var(--fs-body);
}

.page-about .about-intro__fig {
  margin: 0;
  position: relative;
}

.page-about .about-intro__fig::before {
  content: "";
  position: absolute;
  inset: -12px 12px 12px -12px;
  border: 1px solid var(--color-line);
  z-index: 0;
}

.page-about .about-intro__img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  margin: 0 auto;
  object-fit: cover;
  background: var(--color-card);
}

.page-about .about-intro__fig figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--color-muted);
  text-align: right;
  letter-spacing: 0.14em;
}

/* ===== 改版里程碑 ===== */
.page-about .about-milestones {
  position: relative;
  padding: 72px 0 24px;
  background: linear-gradient(180deg, rgba(21, 26, 51, 0.7), rgba(11, 16, 38, 0));
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.page-about .about-milestones__head {
  display: grid;
  gap: 24px;
  margin-bottom: 48px;
}

.page-about .about-milestones__intro {
  margin: 0;
  max-width: 460px;
  color: var(--color-muted);
  line-height: 1.8;
  font-size: var(--fs-body);
  border-left: 1px solid var(--color-neon);
  padding-left: 24px;
}

.page-about .about-milestones__timeline {
  position: relative;
}

.page-about .about-milestones__timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, var(--color-purple-soft), var(--color-line) 68%, transparent);
}

.page-about .milestone-item {
  position: relative;
  padding: 0 0 44px 40px;
}

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

.page-about .milestone-item::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  width: 13px;
  height: 13px;
  background: var(--color-card);
  border: 2px solid var(--color-neon);
  transform: rotate(45deg);
  z-index: 1;
}

.page-about .milestone-item__date {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-neon);
}

.page-about .milestone-item__title {
  margin: 0 0 8px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-light);
}

.page-about .milestone-item__desc {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about .about-milestones__decor {
  margin: 56px 0 40px;
}

.page-about .about-milestones__decor img {
  display: block;
  width: 100%;
  max-width: 800px;
  height: auto;
  margin: 0 auto;
  background: var(--color-card);
}

/* ===== 服务理念 ===== */
.page-about .about-philosophy {
  background:
    radial-gradient(520px 320px at 8% 16%, rgba(0, 255, 157, 0.08), transparent 65%),
    transparent;
}

.page-about .about-philosophy__head {
  display: grid;
  gap: 8px;
  margin-bottom: 36px;
}

.page-about .about-philosophy__head .section-no {
  justify-self: start;
}

.page-about .about-philosophy__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-philosophy__principles {
  display: grid;
  gap: 28px;
}

.page-about .principle {
  position: relative;
  padding: 0 0 28px 56px;
  border-bottom: 1px solid var(--color-line);
}

.page-about .principle:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .principle__no {
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-purple-soft);
  background: linear-gradient(135deg, rgba(123, 47, 234, 0.14), rgba(123, 47, 234, 0.02));
  border: 1px solid var(--color-line);
}

.page-about .principle__title {
  margin: 0 0 8px;
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--color-light);
}

.page-about .principle__text {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about .about-philosophy__fig {
  margin: 0;
}

.page-about .about-philosophy__fig img {
  display: block;
  width: 100%;
  max-width: 600px;
  height: auto;
  object-fit: cover;
  background: var(--color-card);
}

.page-about .about-philosophy__fig figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--color-muted);
  letter-spacing: 0.1em;
  text-align: right;
}

/* ===== 发展数据 ===== */
.page-about .about-stats {
  border-top: 1px solid var(--color-line);
}

.page-about .about-stats__head {
  margin-bottom: 36px;
}

.page-about .about-stats__grid {
  display: grid;
  gap: 16px;
}

.page-about .stat-card {
  padding: 24px 20px;
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-top: 2px solid var(--color-purple);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: var(--t-fast);
}

.page-about .stat-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-purple-soft);
}

.page-about .stat-card__num {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1.05;
  color: var(--color-light);
  letter-spacing: -0.04em;
}

.page-about .stat-card__num small {
  font-size: 20px;
  font-weight: 500;
  color: var(--color-neon);
  margin-left: 2px;
}

.page-about .stat-card__label {
  font-size: var(--fs-caption);
  font-weight: 600;
  color: var(--color-light);
}

.page-about .stat-card__note {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--color-muted);
  line-height: 1.5;
}

/* ===== 页面延伸入口 ===== */
.page-about .about-links {
  border-top: 1px solid var(--color-line);
}

.page-about .about-links__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0 8px;
}

.page-about .about-links__text {
  max-width: 640px;
  margin: 0;
  font-size: var(--fs-caption);
  line-height: 1.8;
  color: var(--color-muted);
}

.page-about .about-links__text a {
  color: var(--color-purple-soft);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-links__text a:hover {
  color: var(--color-light);
}

/* ===== 桌面端增强 ===== */
@media (min-width: 560px) {
  .page-about .about-stats__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 56px 0 104px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: 180px minmax(0, 1fr);
    align-items: start;
    padding-top: 48px;
  }

  .page-about .about-hero__side {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about .about-hero__no {
    font-size: 72px;
  }

  .page-about .about-hero__tag {
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid var(--color-line);
    padding-top: 12px;
  }

  .page-about .about-intro__grid {
    grid-template-columns: var(--about-rail) 1fr;
    gap: 64px;
  }

  .page-about .about-intro__main {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: 64px;
    align-items: center;
  }

  .page-about .about-milestones {
    padding: 96px 0 48px;
  }

  .page-about .about-milestones__head {
    grid-template-columns: 1fr 1fr;
    align-items: end;
    gap: 48px;
    margin-bottom: 64px;
  }

  .page-about .about-milestones__intro {
    justify-self: end;
  }

  .page-about .about-milestones__timeline {
    width: min(100%, 760px);
    margin-left: auto;
    margin-right: 0;
  }

  .page-about .about-milestones__timeline::before {
    left: 22px;
  }

  .page-about .milestone-item {
    padding: 0 0 52px 54px;
  }

  .page-about .milestone-item::after {
    left: 15px;
  }

  .page-about .about-philosophy__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 72px;
    align-items: center;
  }

  .page-about .principle {
    padding-left: 68px;
  }

  .page-about .principle__no {
    width: 48px;
    height: 48px;
    font-size: 20px;
  }

  .page-about .about-stats__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-stats__head {
    margin-bottom: 48px;
  }
}