/* ===== page-about 品牌档案专属样式 ===== */
.page-about {
  color: var(--text-primary);
  font-family: var(--font-body);
  background:
    linear-gradient(135deg, rgba(0, 230, 118, 0.045) 0%, transparent 38%),
    var(--primary-bg);
  padding-bottom: 88px;
}

.page-about .about-wrap {
  max-width: 1140px;
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.page-about .about-head-inner {
  padding-top: 34px;
  padding-bottom: 44px;
}

.page-about .breadcrumb {
  margin-bottom: 28px;
}

.page-about .page-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--accent-green);
  background: var(--hover-mask);
  border-left: 3px solid var(--accent-gold);
  padding: 7px 12px;
  margin-bottom: 18px;
}

.page-about .page-title {
  font-family: var(--font-display);
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: 0.01em;
  margin: 0 0 14px;
}

.page-about .page-lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-secondary);
  max-width: 58em;
  margin: 0;
}

/* ===== 左右版心布局 ===== */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 38px;
  padding-top: 42px;
  padding-bottom: 64px;
  border-top: 1px solid var(--border-line);
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 58px;
  }
}

/* ===== 左侧目录 ===== */
.page-about .about-toc {
  align-self: start;
}

@media (min-width: 960px) {
  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 34px);
  }
}

.page-about .about-toc__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-gold);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-line);
  margin: 0 0 16px;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
}

.page-about .about-toc__list a {
  display: block;
  padding: 10px 0 10px 16px;
  border-left: 2px solid var(--border-line);
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 14px;
  transition: border-color 0.25s ease, color 0.25s ease, padding-left 0.25s ease, background 0.25s ease;
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  border-left-color: var(--accent-green);
  color: var(--text-primary);
  padding-left: 22px;
  background: var(--hover-mask);
}

.page-about .about-toc__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  border: 1px solid var(--border-line);
  background: var(--surface-glass);
  padding: 12px 16px;
}

.page-about .about-toc__meta p {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin: 0;
}

.page-about .about-toc__meta-label {
  color: var(--text-secondary);
}

.page-about .about-toc__meta .data-num {
  color: var(--accent-green);
  font-weight: 600;
}

/* ===== 正文章节框架 ===== */
.page-about .about-section {
  border-top: 1px solid var(--border-line);
  margin-top: 48px;
  padding-top: 40px;
  scroll-margin-top: calc(var(--header-h) + 26px);
}

.page-about .about-section:first-child {
  border-top: 0;
  margin-top: 0;
  padding-top: 0;
}

.page-about .section-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 26px;
}

.page-about .section-num {
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 700;
  line-height: 1;
  min-width: 58px;
  color: transparent;
  -webkit-text-stroke: 1px var(--accent-green);
}

.page-about .section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  letter-spacing: 0.02em;
  margin: 0;
}

.page-about .section-intro {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.85;
  max-width: 62ch;
  margin: 0 0 20px;
}

.page-about .about-article img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

.page-about .about-article figure {
  margin: 0;
}

/* ===== 平台简介 ===== */
.page-about .intro-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
}

@media (min-width: 900px) {
  .page-about .intro-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
  }
}

.page-about .intro-copy p {
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 18px;
}

.page-about .intro-copy p:last-child {
  margin-bottom: 0;
}

.page-about .intro-image {
  width: 100%;
}

@media (min-width: 900px) {
  .page-about .intro-image {
    order: 2;
  }
}

/* ===== 发展里程碑 ===== */
.page-about .timeline-deco {
  display: block;
  margin: 0 0 22px;
}

.page-about .timeline-wrap {
  position: relative;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 23px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: repeating-linear-gradient(
    to bottom,
    var(--border-line) 0,
    var(--border-line) 4px,
    transparent 4px,
    transparent 8px
  );
}

@media (min-width: 900px) {
  .page-about .timeline::before {
    left: 35px;
  }
}

.page-about .milestone {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 20px;
  padding-bottom: 44px;
}

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

@media (min-width: 900px) {
  .page-about .milestone {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 34px;
  }
}

.page-about .milestone__marker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--accent-green);
  border-radius: 50%;
  background: var(--primary-bg);
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--accent-gold);
}

@media (min-width: 900px) {
  .page-about .milestone__marker {
    width: 70px;
    height: 30px;
    border-radius: 0;
    margin-top: 16px;
    font-size: 17px;
    color: var(--accent-green);
    background: var(--primary-bg);
    border-color: var(--border-line);
    clip-path: polygon(0 0, 100% 0, 88% 100%, 0 100%);
  }
}

.page-about .milestone__body h3 {
  font-size: 19px;
  font-weight: 600;
  margin: 0 0 10px;
  color: var(--text-primary);
}

.page-about .milestone__body p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin: 0;
}

.page-about .milestone__hover {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0;
  transition: max-height 0.45s ease, opacity 0.45s ease, margin-top 0.45s ease;
}

.page-about .milestone:hover .milestone__hover,
.page-about .milestone:focus-within .milestone__hover {
  max-height: 160px;
  opacity: 1;
  margin-top: 12px;
}

/* ===== 服务能力与规模 ===== */
.page-about .cap-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-bottom: 22px;
  align-items: center;
}

@media (min-width: 900px) {
  .page-about .cap-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }
}

.page-about .stats-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  border: 1px solid var(--border-line);
  background: var(--border-line);
}

@media (min-width: 640px) {
  .page-about .stats-list {
    grid-template-columns: 1fr 1fr;
  }
}

.page-about .stat-item {
  position: relative;
  padding: 20px 22px;
  background: var(--secondary-bg);
}

.page-about .stat-item dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.page-about .stat-item dd {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
}

.page-about .stat-item dd .data-num {
  font-family: var(--font-mono);
  font-size: 30px;
  color: var(--accent-green);
  margin-right: 2px;
}

.page-about .stat-tip {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: calc(100% - 4px);
  z-index: 5;
  padding: 8px 10px;
  background: #081730;
  border: 1px solid var(--accent-green);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  color: var(--text-primary);
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.page-about .stat-item:hover .stat-tip,
.page-about .stat-item:focus-within .stat-tip {
  opacity: 1;
  transform: translateY(0);
}

.page-about .cap-image {
  width: 100%;
}

.page-about .cap-note {
  margin: 0;
  padding: 14px 18px;
  border-left: 3px solid var(--accent-gold);
  background: var(--surface-glass);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* ===== 资质与认证 ===== */
.page-about .cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

@media (min-width: 900px) {
  .page-about .cert-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

.page-about .cert-list {
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.page-about .cert-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-line);
}

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

.page-about .cert-item__badge {
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-gold);
  border: 1px solid var(--accent-green);
  clip-path: polygon(0 0, 100% 0, 85% 100%, 0 100%);
}

.page-about .cert-item h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--text-primary);
}

.page-about .cert-item p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin: 0;
}

.page-about .cert-image {
  width: 100%;
}

/* ===== 合作与生态 ===== */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-bottom: 34px;
}

@media (min-width: 640px) {
  .page-about .eco-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 960px) {
  .page-about .eco-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.page-about .eco-item {
  padding: 20px 4px 8px 0;
  border-top: 2px solid var(--accent-gold);
}

.page-about .eco-item h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--text-primary);
}

.page-about .eco-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin: 0;
}

.page-about .eco-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  padding: 28px;
  border: 1px solid var(--border-line);
  background: linear-gradient(135deg, rgba(0, 230, 118, 0.07), rgba(255, 215, 0, 0.04));
}

.page-about .eco-cta p {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.page-about .eco-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .text-link {
  color: var(--accent-green);
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: left 100%;
  background-size: 0 1px;
  transition: background-size 0.3s ease;
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  background-size: 100% 1px;
}

/* ===== 窄屏防溢出与阅读舒适度 ===== */
@media (max-width: 480px) {
  .page-about .about-wrap {
    padding-inline: 14px;
  }

  .page-about .capsule-grid,
  .page-about .stat-tip {
    left: 12px;
    right: 12px;
  }

  .page-about .page-lead {
    font-size: 15px;
  }

  .page-about .timeline::before {
    left: 19px;
  }

  .page-about .milestone {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 16px;
  }

  .page-about .milestone__marker {
    width: 36px;
    height: 36px;
    font-size: 12px;
  }
}