.page-about {
  position: relative;
  background:
    radial-gradient(circle at 12% 18%, rgba(0, 212, 255, 0.07) 0, transparent 30%),
    radial-gradient(circle at 86% 62%, rgba(255, 94, 58, 0.06) 0, transparent 26%),
    radial-gradient(circle at 45% 88%, rgba(255, 154, 61, 0.04) 0, transparent 34%),
    var(--c-bg);
}

.page-about .breadcrumbs {
  padding-top: 14px;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--c-muted);
}

.page-about .breadcrumbs ol li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--c-line);
}

.page-about .breadcrumbs a {
  color: var(--c-cyan);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  text-decoration: underline;
}

.page-about .section {
  padding: clamp(36px, 7vw, 80px) 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .section-head {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .section-head__desc {
  color: var(--c-muted);
  max-width: 52ch;
  margin-top: 8px;
  line-height: 1.7;
}

/* 01 品牌速览 */
.page-about .about-hero__inner {
  display: grid;
  gap: var(--gap);
  align-items: center;
}

.page-about .about-hero__media {
  margin: 0;
  max-width: 500px;
  width: 100%;
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow);
  position: relative;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: auto -10px -10px auto;
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--c-accent), var(--c-accent-2));
  z-index: -1;
}

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

.page-about .about-hero__lead {
  font-size: clamp(18px, 2.4vw, 24px);
  line-height: 1.6;
  font-weight: 700;
  color: var(--c-text);
  margin-top: 18px;
}

.page-about .about-hero__copy {
  color: var(--c-muted);
  line-height: 1.8;
  margin-top: 12px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* 02 发展时间线 */
.page-about .about-timeline__shell {
  display: grid;
  gap: clamp(18px, 3vw, 40px);
  margin-top: clamp(24px, 4vw, 48px);
}

.page-about .about-timeline__rail {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--c-line);
}

.page-about .timeline-node {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0 12px 22px;
  color: var(--c-muted);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  position: relative;
  transition: color 0.2s;
}

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-bg);
  border: 2px solid var(--c-line-strong);
}

.page-about .timeline-node:hover,
.page-about .timeline-node--current {
  color: var(--c-text);
}

.page-about .timeline-node--current::before {
  background: var(--c-accent);
  border-color: var(--c-accent);
  box-shadow: 0 0 0 4px rgba(255, 94, 58, 0.18);
}

.page-about .timeline-node__num {
  color: var(--c-accent);
  font-size: 12px;
}

.page-about .about-timeline__stages {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .timeline-stage {
  border: 1px solid var(--c-line);
  padding: clamp(18px, 3vw, 28px);
  background: linear-gradient(135deg, rgba(20, 26, 60, 0.86), rgba(10, 15, 44, 0.76));
  box-shadow: var(--shadow);
}

.page-about .timeline-stage h3 {
  font-size: clamp(18px, 2.6vw, 24px);
  margin: 0 0 10px;
  color: var(--c-text);
}

.page-about .timeline-stage p {
  color: var(--c-muted);
  line-height: 1.8;
  margin: 0;
}

.page-about .timeline-stage--current {
  border-color: var(--c-accent);
}

.page-about .timeline-stage__media {
  margin: 20px auto 0;
  max-width: 320px;
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow);
}

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

/* 03 数据与服务能力 */
.page-about .about-data__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.page-about .stat-block {
  border: 1px solid var(--c-line);
  padding: clamp(18px, 2.8vw, 30px);
  background: rgba(20, 26, 60, 0.72);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .stat-block__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.6vw, 54px);
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent-2) 80%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--c-accent);
}

.page-about .stat-block__label {
  font-size: 13px;
  color: var(--c-muted);
  letter-spacing: 0.02em;
}

.page-about .about-data__lower {
  display: grid;
  gap: var(--gap);
  margin-top: clamp(24px, 4vw, 40px);
  align-items: center;
}

.page-about .about-data__media {
  margin: 0;
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow);
}

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

.page-about .about-data__media figcaption {
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-muted);
  background: rgba(20, 26, 60, 0.9);
  border-top: 1px solid var(--c-line);
}

.page-about .about-data__capabilities {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .chip-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.page-about .capability-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .capability-list li {
  position: relative;
  padding-left: 22px;
  color: var(--c-text);
  line-height: 1.7;
}

.page-about .capability-list li::before {
  content: "›";
  position: absolute;
  left: 6px;
  color: var(--c-cyan);
  font-family: var(--font-mono);
  font-weight: 700;
}

/* 04 用户承诺 */
.page-about .about-promise__cards {
  display: grid;
  gap: 16px;
}

.page-about .promise-card {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
}

.page-about .promise-card__num {
  position: absolute;
  top: 14px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-muted);
  opacity: 0.6;
}

.page-about .promise-card h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.page-about .promise-card p {
  margin: 0;
  color: var(--c-muted);
  line-height: 1.75;
}

.page-about .promise-card p a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 212, 255, 0.4);
}

.page-about .about-promise__foot {
  margin-top: clamp(24px, 4vw, 36px);
  padding-top: 20px;
  border-top: 1px solid var(--c-line);
  color: var(--c-muted);
  line-height: 1.7;
}

.page-about .about-promise__foot a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 212, 255, 0.4);
}

/* 桌面端 */
@media (min-width: 768px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-timeline__shell {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: clamp(28px, 5vw, 64px);
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: 24px;
    align-self: start;
  }

  .page-about .about-timeline__stages {
    gap: 24px;
  }

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

  .page-about .stat-block__num {
    font-size: clamp(26px, 3vw, 44px);
  }

  .page-about .about-data__lower {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 52px);
  }

  .page-about .about-data__capabilities {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
  }

  .page-about .chip-list {
    flex: 0 0 auto;
    max-width: 260px;
  }

  .page-about .capability-list {
    flex: 1;
    max-width: 560px;
  }

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