.page-about {
  --about-hero-border: rgba(255, 255, 255, 0.14);
  --about-rule-bg: rgba(255, 255, 255, 0.07);
  background: var(--paper);
  color: var(--deep-blue);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 18px 16px 0;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted-text);
}
.page-about .breadcrumb a {
  color: var(--pitch-green);
  text-decoration: none;
  font-weight: 700;
  transition: color 0.2s;
}
.page-about .breadcrumb a:hover {
  color: var(--deep-blue);
}
.page-about .breadcrumb__sep {
  opacity: 0.5;
}

/* 首屏：品牌叙事 + 时间轴 */
.page-about .about-hero {
  background: var(--deep-blue);
}
.page-about .about-hero__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 16px;
}
.page-about .about-hero__narrative {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  background:
    linear-gradient(135deg, rgba(30, 152, 79, 0.16) 0%, transparent 42%),
    var(--deep-blue);
  color: #fff;
  padding: 40px 24px;
  overflow: hidden;
}
.page-about .about-hero__narrative::before {
  content: "2018";
  position: absolute;
  right: 16px;
  top: 54px;
  z-index: 1;
  font-family: var(--font-data);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(5rem, 12vw, 8rem);
  line-height: 1;
  color: rgba(255, 255, 255, 0.05);
  pointer-events: none;
  transform: rotate(-6deg);
}
.page-about .about-hero__flag {
  position: relative;
  z-index: 2;
  margin-bottom: 20px;
}
.page-about .about-hero__title {
  position: relative;
  z-index: 2;
  max-width: 11em;
  margin: 0 0 18px;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(1.8rem, 5vw, 3rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
}
.page-about .about-hero__lead {
  position: relative;
  z-index: 2;
  max-width: 30em;
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.82);
}
.page-about .about-hero__symbol {
  position: relative;
  z-index: 2;
  display: block;
  width: 100%;
  max-width: 360px;
  height: auto;
  margin: 32px auto 0;
  border-radius: var(--radius);
  border: 1px solid var(--about-hero-border);
  box-shadow: var(--shadow-lg);
}

/* 时间轴面板 */
.page-about .about-hero__timeline-panel {
  position: relative;
  background: var(--paper);
  color: var(--deep-blue);
  padding: 40px 24px 44px;
  border-radius: 0 0 var(--radius) var(--radius);
  margin-bottom: 16px;
}
.page-about .about-hero__panel-meta {
  margin: 0 0 18px;
  font-family: var(--font-data);
  font-style: italic;
  font-weight: 900;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--pitch-green);
}
.page-about .about-hero__legend {
  margin: -6px 0 24px;
}
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  border-left: 2px solid var(--line);
}
.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 34px;
}
.page-about .about-timeline__item:last-child {
  margin-bottom: 0;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 3px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--pitch-green);
  transition: background 0.2s, transform 0.2s;
}
.page-about .about-timeline__item:hover::before {
  background: var(--pitch-green);
  transform: scale(1.25);
}
.page-about .about-timeline__num {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 12px;
  font-family: var(--font-data);
  font-style: italic;
  font-weight: 900;
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--deep-blue);
  background: var(--sun-yellow);
  border-radius: 999px;
}
.page-about .about-timeline__detail summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.14rem;
  line-height: 1.4;
  color: var(--deep-blue);
  transition: color 0.2s;
}
.page-about .about-timeline__detail summary::-webkit-details-marker {
  display: none;
}
.page-about .about-timeline__detail summary::after {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--pitch-green);
  color: #fff;
  font-size: 14px;
  font-weight: 900;
  flex-shrink: 0;
  transition: transform 0.2s;
}
.page-about .about-timeline__detail[open] summary::after {
  transform: rotate(45deg);
}
.page-about .about-timeline__item:hover .about-timeline__detail summary {
  color: var(--pitch-green);
}
.page-about .about-timeline__detail p {
  margin: 12px 0 0;
  max-width: 34em;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--muted-text);
}
.page-about .about-hero__panel-footer {
  display: flex;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

/* 页面章节标题与坐标编号 */
.page-about h2.section-title {
  position: relative;
  margin: 0;
  padding: 0 64px 0 16px;
  border-left: 4px solid var(--pitch-green);
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--deep-blue);
}
.page-about .about-coord {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--pitch-green);
  color: #fff;
  font-family: var(--font-data);
  font-style: italic;
  font-weight: 900;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
}

/* 服务能力面板 */
.page-about .about-capability {
  background: var(--paper);
  padding: 56px 16px;
}
.page-about .about-capability__intro {
  max-width: 44em;
  margin: 14px 0 0;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--muted-text);
}
.page-about .about-capability__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 32px;
}
.page-about .about-capability__stat {
  --stat-color: var(--pitch-green);
  position: relative;
  overflow: hidden;
  padding: 24px 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.page-about .about-capability__stat::after {
  content: "";
  position: absolute;
  right: -20px;
  top: -20px;
  width: 72px;
  height: 72px;
  background: var(--stat-color);
  clip-path: polygon(100% 0, 0 100%, 100% 100%);
  opacity: 0.1;
}
.page-about .about-capability__stat--green { --stat-color: var(--pitch-green); }
.page-about .about-capability__stat--wine { --stat-color: var(--wine-red); }
.page-about .about-capability__stat--yellow { --stat-color: var(--sun-yellow); }
.page-about .about-capability__stat--indigo { --stat-color: var(--indigo); }
.page-about .about-capability__num {
  display: block;
  white-space: nowrap;
  font-family: var(--font-data);
  font-style: italic;
  font-weight: 900;
  line-height: 1;
  font-size: clamp(1.7rem, 5vw, 3.2rem);
  color: var(--stat-color);
}
.page-about .about-capability__label {
  display: block;
  margin-top: 10px;
  font-size: 0.84rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--muted-text);
}
.page-about .about-capability__chart {
  margin: 32px 0 0;
}
.page-about .about-capability__chart img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
}
.page-about .about-capability__chart figcaption {
  margin-top: 12px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted-text);
}

/* 数据刷新准则 */
.page-about .about-data {
  background-color: var(--indigo);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 30px 30px;
  padding: 56px 16px;
}
.page-about .about-data h2 {
  color: #fff;
  border-left-color: var(--pitch-green-light);
}
.page-about .about-data__rules {
  display: grid;
  gap: 18px;
  margin-top: 36px;
}
.page-about .about-data__rule {
  --rule-color: var(--pitch-green-light);
  background: var(--about-rule-bg);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-left: 4px solid var(--rule-color);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 26px 22px;
  transition: background 0.25s, border-left-color 0.25s;
}
.page-about .about-data__rule:nth-child(2) { --rule-color: var(--sun-yellow); }
.page-about .about-data__rule:nth-child(3) { --rule-color: var(--orange); }
.page-about .about-data__rule:hover {
  background: rgba(255, 255, 255, 0.12);
}
.page-about .about-data__rule-num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-data);
  font-style: italic;
  font-weight: 900;
  font-size: 2.2rem;
  line-height: 1;
  color: var(--rule-color);
}
.page-about .about-data__rule-body h3 {
  margin: 0 0 8px;
  font-size: 1.08rem;
  font-weight: 800;
  color: #fff;
}
.page-about .about-data__rule-body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.8);
}

/* 团队与协作生态 */
.page-about .about-ecosystem {
  background: var(--paper);
  padding: 56px 16px;
}
.page-about .about-ecosystem__content > p {
  margin: 14px 0 16px;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--muted-text);
}
.page-about .about-ecosystem__list {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .about-ecosystem__list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-ecosystem__key {
  flex-shrink: 0;
  white-space: nowrap;
  font-family: var(--font-data);
  font-style: italic;
  font-weight: 900;
  font-size: 1.05rem;
  color: var(--pitch-green);
}
.page-about .about-ecosystem__desc {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--muted-text);
}
.page-about .about-ecosystem__visual {
  margin: 32px 0 0;
}
.page-about .about-ecosystem__visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
}
.page-about .about-ecosystem__visual figcaption {
  margin-top: 12px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted-text);
}
.page-about .about-ecosystem__content .btn {
  margin-top: 8px;
}

/* 信任与合规 */
.page-about .about-trust {
  background: #fff;
  border-top: 1px solid var(--line);
  padding: 56px 16px 72px;
}
.page-about .about-trust__grid {
  display: grid;
  gap: 18px;
  margin-top: 36px;
}
.page-about .about-trust__card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 26px 22px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
}
.page-about .about-trust__card:hover {
  border-color: var(--pitch-green);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.page-about .about-trust__card p {
  margin: 14px 0 18px;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted-text);
}
.page-about .about-trust__card a {
  margin-top: auto;
  font-weight: 800;
  font-size: 0.88rem;
  color: var(--pitch-green);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-bottom-color 0.2s;
}
.page-about .about-trust__card a:hover {
  border-bottom-color: var(--pitch-green);
}
.page-about .about-trust__tag {
  align-self: flex-start;
}

/* 桌面端增强 */
@media (min-width: 900px) {
  .page-about .breadcrumb {
    padding: 22px 24px 0;
  }
  .page-about .about-hero__inner {
    padding: 0 24px;
  }
  .page-about .about-hero__narrative {
    padding: 64px 48px;
  }
  .page-about .about-hero__symbol {
    max-width: 420px;
    margin: auto 0 0;
    padding-top: 40px;
  }
  .page-about .about-hero__timeline-panel {
    padding: 64px 48px 72px;
    border-radius: var(--radius) 0 0 var(--radius);
    margin-bottom: 0;
  }
  .page-about .about-capability {
    padding: 72px 24px;
  }
  .page-about .about-capability__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
  }
  .page-about .about-capability__stat {
    padding: 32px 24px;
  }
  .page-about .about-capability__chart {
    margin-top: 40px;
  }
  .page-about .about-data {
    padding: 72px 24px;
  }
  .page-about .about-data__rules {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .page-about .about-ecosystem {
    padding: 72px 24px;
  }
  .page-about .about-ecosystem__visual {
    margin: 0;
  }
  .page-about .about-ecosystem__list {
    margin-top: 20px;
  }
  .page-about .about-trust {
    padding: 72px 24px 88px;
  }
  .page-about .about-trust__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}