.page-about {
  --about-grid-line: rgba(255, 255, 255, 0.06);
  --about-rule: rgba(26, 26, 26, 0.1);
  --about-gold-glow: rgba(212, 175, 55, 0.3);
  --about-white-soft: rgba(255, 255, 255, 0.78);
}

/* ---------- Hero 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 104px 0 56px;
  background: linear-gradient(128deg, var(--green-900) 0%, var(--green-700) 58%, var(--gray-900) 100%);
  color: var(--white);
  overflow: hidden;
}

.page-about .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: 36px 36px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 38%;
  height: 100%;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.16), transparent 62%);
  clip-path: polygon(100% 0, 100% 100%, 38% 100%, 0 0);
  pointer-events: none;
}

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

.page-about .about-hero__copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.72);
  margin: 0 0 6px;
  font-family: var(--font-body);
}

.page-about .breadcrumbs__link {
  color: var(--gold-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 175, 55, 0.4);
  transition: border-color 0.2s ease;
}

.page-about .breadcrumbs__link:hover {
  border-color: var(--gold-500);
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 12em;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  line-height: 1.22;
  color: var(--white);
  font-family: var(--font-heading);
  font-weight: 700;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 56ch;
  color: var(--about-white-soft);
  line-height: 1.8;
  font-size: 0.98rem;
  font-family: var(--font-body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  aspect-ratio: 3 / 2;
  background: var(--green-700);
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.page-about .about-hero__media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .about-hero__badge {
  position: absolute;
  left: 20px;
  bottom: 20px;
  z-index: 2;
  background: var(--gold-500);
  color: var(--green-900);
  font-family: var(--font-number);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.4;
  padding: 10px 16px;
  border: 1px solid rgba(255, 255, 255, 0.6);
}

/* ---------- 我们是谁 / 品牌理念 ---------- */
.page-about .about-mission {
  padding: 72px 0;
  background: var(--white);
}

.page-about .about-mission__grid {
  display: grid;
  gap: 48px;
}

.page-about .about-mission__heading .eyebrow {
  margin: 0 0 12px;
}

.page-about .about-mission__heading h2 {
  margin: 12px 0 20px;
  max-width: 14em;
  color: var(--green-900);
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .about-mission__statement {
  margin: 0;
  color: var(--gray-700);
  font-size: 1.02rem;
  line-height: 1.8;
  font-family: var(--font-body);
}

.page-about .about-mission__slogan {
  margin: 24px 0 0;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--green-700);
  background: var(--gray-100);
  border-right: 4px solid var(--gold-500);
  padding: 16px 20px;
  line-height: 1.5;
}

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

.page-about .about-mission__note {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  background: var(--gray-100);
  padding: 22px;
  border-left: 3px solid var(--gold-500);
  transition: background 0.2s ease;
}

.page-about .about-mission__note:hover {
  background: #EDEDED;
}

.page-about .about-mission__note .index-label {
  font-family: var(--font-number);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--green-700);
  border: 1px solid rgba(20, 83, 45, 0.3);
  border-radius: var(--radius);
  padding: 4px 8px;
  flex-shrink: 0;
  line-height: 1.2;
  display: inline-block;
}

.page-about .about-mission__note h3 {
  margin: 0 0 6px;
  font-size: 1.08rem;
  color: var(--green-900);
  font-family: var(--font-heading);
  font-weight: 600;
}

.page-about .about-mission__note p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--gray-700);
  line-height: 1.75;
  font-family: var(--font-body);
}

/* ---------- 数据里程 / 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  background: var(--green-900);
  color: var(--white);
  overflow: hidden;
  padding: 72px 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 110px;
  height: 100%;
  background: repeating-linear-gradient(-45deg, rgba(255, 255, 255, 0.045) 0, rgba(255, 255, 255, 0.045) 2px, transparent 2px, transparent 12px);
  clip-path: polygon(100% 0, 100% 100%, 50% 100%, 0 0);
  pointer-events: none;
}

.page-about .about-timeline .eyebrow {
  margin: 0 0 12px;
}

.page-about .about-timeline h2 {
  margin: 12px 0 0;
  color: var(--white);
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .about-timeline__intro {
  max-width: 62ch;
  color: var(--about-white-soft);
  line-height: 1.8;
  font-size: 0.95rem;
  margin: 20px 0 0;
  font-family: var(--font-body);
}

.page-about .timeline {
  position: relative;
  margin: 48px 0 0;
  padding: 0;
  max-width: 1000px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 9px;
  width: 1px;
  background: var(--about-gold-glow);
}

.page-about .timeline__item {
  position: relative;
  display: block;
  padding: 0 0 40px 36px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 3px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold-500);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.14);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.page-about .timeline__item--highlight::before {
  background: var(--gold-300);
  box-shadow: 0 0 0 6px rgba(212, 175, 55, 0.18), 0 0 22px rgba(212, 175, 55, 0.4);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-number);
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold-500);
  margin-bottom: 8px;
}

.page-about .timeline__item--highlight .timeline__year {
  color: var(--gold-300);
}

.page-about .timeline__content h3 {
  margin: 0 0 8px;
  font-size: 1.12rem;
  color: var(--white);
  font-family: var(--font-heading);
  font-weight: 600;
}

.page-about .timeline__content p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--about-white-soft);
  max-width: 42ch;
  font-family: var(--font-body);
}

.page-about .timeline__item:hover .timeline__year {
  color: var(--gold-300);
}

.page-about .timeline__item:hover::before {
  background: var(--gold-300);
  box-shadow: 0 0 0 8px rgba(212, 175, 55, 0.2), 0 0 28px rgba(212, 175, 55, 0.45);
}

/* ---------- 技术架构 ---------- */
.page-about .about-architecture {
  background: var(--gray-100);
  padding: 72px 0;
}

.page-about .about-architecture .eyebrow {
  margin: 0 0 12px;
}

.page-about .about-architecture h2 {
  margin: 12px 0 0;
  color: var(--green-900);
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .about-architecture__grid {
  display: grid;
  gap: 40px;
  margin-top: 36px;
}

.page-about .about-architecture__flow {
  order: 2;
}

.page-about .flow-step {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 22px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .flow-step:first-child {
  padding-top: 0;
}

.page-about .flow-step__num {
  font-family: var(--font-number);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--green-700);
  border: 1px solid rgba(20, 83, 45, 0.35);
  border-radius: var(--radius);
  padding: 3px 7px;
  flex-shrink: 0;
  line-height: 1.4;
}

.page-about .flow-step h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
  color: var(--green-900);
  font-family: var(--font-heading);
  font-weight: 600;
}

.page-about .flow-step p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--gray-700);
  font-family: var(--font-body);
}

.page-about .about-architecture__aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
  order: 1;
}

.page-about .about-architecture__aside img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 6px solid var(--white);
  box-shadow: 0 12px 32px rgba(26, 26, 26, 0.14);
}

.page-about .about-architecture__point {
  background: var(--white);
  border-left: 4px solid var(--gold-500);
  padding: 18px 20px;
}

.page-about .about-architecture__point h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  color: var(--green-900);
  font-family: var(--font-heading);
  font-weight: 600;
}

.page-about .about-architecture__point p {
  margin: 0;
  color: var(--gray-700);
  font-size: 0.88rem;
  line-height: 1.75;
  font-family: var(--font-body);
}

/* ---------- 用户规模 / 深色数据区 ---------- */
.page-about .about-scale {
  background: var(--gray-900);
  color: var(--white);
  text-align: center;
  padding: 72px 0;
}

.page-about .about-scale .eyebrow {
  margin: 0 0 12px;
  justify-content: center;
}

.page-about .about-scale h2 {
  margin: 12px 0 0;
  color: var(--white);
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 40px 0 32px;
}

.page-about .about-scale .stat-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 28px 18px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-scale .stat-card:hover {
  transform: translateY(-3px);
  border-color: rgba(212, 175, 55, 0.5);
}

.page-about .about-scale .stat-card__value {
  font-family: var(--font-number);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--gold-500);
  line-height: 1.2;
  display: block;
}

.page-about .about-scale .stat-card__label {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.78);
  display: block;
  margin-top: 6px;
  font-family: var(--font-body);
}

.page-about .about-scale__note {
  max-width: 720px;
  margin: 0 auto;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.8;
  font-size: 0.95rem;
  font-family: var(--font-body);
}

.page-about .about-scale__note .btn {
  margin-top: 22px;
}

/* ---------- 服务理念与城市天际线 ---------- */
.page-about .about-commitment {
  background: var(--white);
  padding: 72px 0;
}

.page-about .about-commitment__copy .eyebrow {
  margin: 0 0 12px;
}

.page-about .about-commitment__copy h2 {
  margin: 12px 0 16px;
  color: var(--green-900);
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .about-commitment__copy p {
  color: var(--gray-700);
  line-height: 1.85;
  margin: 0 0 16px;
  max-width: 62ch;
  font-family: var(--font-body);
}

.page-about .about-commitment__copy .btn {
  margin-top: 8px;
}

.page-about .about-commitment__media-wrap {
  margin-top: 48px;
}

.page-about .about-commitment__media {
  margin: 0;
  padding: 0;
  border: 1px solid var(--about-rule);
  background: var(--gray-900);
}

.page-about .about-commitment__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

@media (min-width: 860px) {
  .page-about .timeline {
    margin: 56px auto 0;
  }

  .page-about .timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .timeline__item {
    width: calc(50% - 44px);
    padding: 0 0 52px;
  }

  .page-about .timeline__item:nth-child(odd) {
    margin-right: auto;
    text-align: right;
  }

  .page-about .timeline__item:nth-child(even) {
    margin-left: auto;
    text-align: left;
  }

  .page-about .timeline__item::before {
    left: auto;
    right: auto;
    top: 20px;
  }

  .page-about .timeline__item:nth-child(odd)::before {
    right: -50px;
  }

  .page-about .timeline__item:nth-child(even)::before {
    left: -50px;
  }

  .page-about .timeline__year {
    font-size: 2.1rem;
  }

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

  .page-about .about-scale__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin: 56px 0 40px;
  }

  .page-about .about-scale .stat-card__value {
    font-size: 2.8rem;
  }
}

@media (min-width: 992px) {
  .page-about .about-hero {
    padding: 140px 0 72px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: 0.95fr 1.05fr;
    gap: 60px;
    align-items: center;
    min-height: 460px;
  }

  .page-about .about-mission {
    padding: 88px 0;
  }

  .page-about .about-mission__grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 80px;
    align-items: center;
  }

  .page-about .about-timeline {
    padding: 88px 0;
  }

  .page-about .about-architecture {
    padding: 88px 0;
  }

  .page-about .about-architecture__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 56px;
    align-items: start;
    margin-top: 44px;
  }

  .page-about .about-architecture__flow {
    order: 1;
  }

  .page-about .about-architecture__aside {
    order: 2;
  }

  .page-about .about-scale {
    padding: 88px 0;
  }

  .page-about .about-commitment {
    padding: 88px 0;
  }

  .page-about .about-commitment__media img {
    aspect-ratio: 4 / 1;
  }
}