/* ===== 品牌概况页专属样式 ===== */
.page-about {
  --about-grid-line: rgba(160, 196, 255, 0.065);
  background-color: var(--clr-light);
  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;
  color: var(--clr-ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .about-breadcrumb {
  padding: 18px 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.page-about .about-breadcrumb-link {
  color: var(--clr-deep);
  text-decoration: none;
  transition: color var(--transition);
}

.page-about .about-breadcrumb-link:hover,
.page-about .about-breadcrumb-link:focus-visible {
  color: var(--clr-orange);
  outline: none;
}

.page-about .about-breadcrumb-sep {
  margin: 0 8px;
  color: var(--clr-mist);
}

.page-about .about-breadcrumb-current {
  color: var(--clr-ink);
  font-weight: 700;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 56px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--clr-cyan), var(--clr-orange) 45%, transparent 85%);
  opacity: 0.6;
}

.page-about .about-hero-inner {
  position: relative;
}

.page-about .about-hero-kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
}

.page-about .about-hero-code {
  padding: 4px 10px;
  border: 1px solid var(--clr-mist);
  border-radius: var(--radius);
  color: var(--clr-deep);
}

.page-about .about-hero-title {
  margin: 0 0 22px;
  font-family: var(--font-heading);
  font-size: clamp(34px, 7vw, 60px);
  font-weight: 900;
  line-height: 1.12;
  color: var(--clr-deep);
  letter-spacing: -0.02em;
}

.page-about .about-hero-lead {
  margin: 0;
  max-width: 640px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--clr-ink);
}

.page-about .about-hero-index {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  max-width: 500px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 2px solid var(--clr-deep);
}

.page-about .about-hero-index-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  background: #fff;
  border-left: 4px solid var(--clr-cyan);
  box-shadow: var(--shadow-sm);
  color: var(--clr-deep);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.page-about .about-hero-index-item:hover,
.page-about .about-hero-index-item:focus-visible {
  border-left-color: var(--clr-orange);
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
  outline: none;
}

.page-about .about-hero-index-no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--clr-orange);
  font-weight: 700;
}

/* 章节 */
.page-about .about-section {
  padding: 56px 0;
}

.page-about .about-section-head {
  max-width: 720px;
  margin-bottom: 36px;
}

.page-about .about-section-num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--clr-orange);
}

.page-about .about-section-title {
  margin: 0 0 12px;
  font-family: var(--font-heading);
  font-size: 30px;
  font-weight: 900;
  color: var(--clr-deep);
  line-height: 1.2;
}

.page-about .about-section-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--clr-ink);
}

/* 通用段落 */
.page-about .about-paragraph {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--clr-ink);
}

.page-about .about-paragraph b {
  color: var(--clr-deep);
  font-weight: 700;
}

/* 平台简介 */
.page-about .about-platform-grid {
  display: grid;
  gap: 36px;
  align-items: start;
}

.page-about .about-feature-list {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-feature-item {
  display: flex;
  gap: 14px;
  padding: 18px 16px;
  background: #fff;
  border: 1px solid var(--clr-warm);
  border-left: 4px solid var(--clr-deep);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about .about-feature-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.page-about .about-feature-icon {
  flex-shrink: 0;
  font-size: 16px;
  line-height: 1.5;
  color: var(--clr-orange);
}

.page-about .about-feature-item h3 {
  margin: 0 0 4px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 900;
  color: var(--clr-deep);
}

.page-about .about-feature-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--clr-ink);
}

/* 图片框（仅页面内实例覆盖） */
.page-about .about-platform-figure,
.page-about .about-timeline-figure,
.page-about .about-eco-figure {
  margin: 0;
}

.page-about .about-platform-figure.img-frame {
  aspect-ratio: 4 / 3;
}

.page-about .about-timeline-figure.img-frame {
  aspect-ratio: 3 / 2;
}

.page-about .about-eco-figure.img-frame {
  aspect-ratio: 2 / 1;
}

.page-about .about-platform-figure .img-caption,
.page-about .about-timeline-figure .img-caption,
.page-about .about-eco-figure .img-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--clr-mist);
}

/* 数据统计 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 48px;
}

.page-about .about-stat-card {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 22px 18px;
  background: var(--clr-deep);
  border-left: 4px solid var(--clr-orange);
  color: #fff;
}

.page-about .about-stat-card .data-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-mist);
}

.page-about .about-stat-value {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--clr-orange);
}

.page-about .about-stat-note {
  font-size: 12px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.72);
}

/* 时间轴 */
.page-about .about-timeline {
  position: relative;
  margin: 40px 0 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--clr-cyan), var(--clr-orange) 45%, var(--clr-mist));
  opacity: 0.55;
}

.page-about .about-timeline-item {
  position: relative;
  margin-bottom: 32px;
  padding-left: 32px;
}

.page-about .about-timeline-item:last-child {
  margin-bottom: 0;
}

.page-about .about-timeline-dot {
  position: absolute;
  left: -1px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--clr-orange);
  border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--clr-orange);
  transition: transform var(--transition), background-color var(--transition), box-shadow var(--transition);
}

.page-about .about-timeline-item:hover .about-timeline-dot,
.page-about .about-timeline-item:focus-within .about-timeline-dot {
  transform: scale(1.25);
  background: var(--clr-cyan);
  box-shadow: 0 0 0 2px var(--clr-cyan);
}

.page-about .about-timeline-label {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--clr-cyan);
}

.page-about .about-timeline-card {
  background: #fff;
  border: 1px solid var(--clr-warm);
  border-top: 3px solid var(--clr-deep);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about .about-timeline-card:hover,
.page-about .about-timeline-card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.page-about .about-timeline-card h3 {
  margin: 12px 0 8px;
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 900;
  color: var(--clr-deep);
}

.page-about .about-timeline-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--clr-ink);
}

.page-about .about-timeline-extra {
  max-height: 0;
  margin: 0;
  padding: 0;
  overflow: hidden;
  border-top: 0 solid var(--clr-mist);
  font-size: 13px;
  line-height: 1.7;
  color: var(--clr-deep-light);
  opacity: 0;
  transition: max-height 0.35s ease, opacity 0.3s ease, padding 0.3s ease, margin 0.3s ease, border-width 0.3s ease;
}

.page-about .about-timeline-card:hover .about-timeline-extra,
.page-about .about-timeline-card:focus-within .about-timeline-extra {
  max-height: 120px;
  margin-top: 10px;
  padding-top: 10px;
  border-top-width: 1px;
  opacity: 1;
}

.page-about .about-timeline-figure {
  margin-top: 40px;
  max-width: 680px;
}

/* 资质与认证 */
.page-about .about-cert-grid {
  display: grid;
  gap: 16px;
}

.page-about .about-cert-card {
  position: relative;
  overflow: hidden;
  padding: 26px 22px;
  background: #fff;
  border: 1px solid var(--clr-warm);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about .about-cert-card::after {
  content: "";
  position: absolute;
  right: -22px;
  top: -22px;
  width: 90px;
  height: 90px;
  background: repeating-linear-gradient(
    135deg,
    rgba(0, 217, 255, 0.16) 0,
    rgba(0, 217, 255, 0.16) 10px,
    transparent 10px,
    transparent 20px
  );
  pointer-events: none;
}

.page-about .about-cert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.page-about .about-cert-card:nth-child(2) {
  background: var(--clr-deep);
  border-color: var(--clr-deep);
}

.page-about .about-cert-card:nth-child(2) h3 {
  color: #fff;
}

.page-about .about-cert-card:nth-child(2) p {
  color: rgba(255, 255, 255, 0.78);
}

.page-about .about-cert-card:nth-child(2) .about-cert-badge {
  color: var(--clr-cyan);
  opacity: 1;
}

.page-about .about-cert-card:nth-child(2)::after {
  background: repeating-linear-gradient(
    135deg,
    rgba(255, 107, 53, 0.22) 0,
    rgba(255, 107, 53, 0.22) 10px,
    transparent 10px,
    transparent 20px
  );
}

.page-about .about-cert-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.page-about .about-cert-badge {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--clr-deep);
  opacity: 0.16;
}

.page-about .about-cert-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 900;
  color: var(--clr-deep);
}

.page-about .about-cert-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--clr-ink);
}

/* 合作生态 */
.page-about .about-ecosystem {
  background: linear-gradient(135deg, rgba(11, 37, 69, 0.04), rgba(160, 196, 255, 0.08));
}

.page-about .about-eco-grid {
  display: grid;
  gap: 36px;
  align-items: start;
}

.page-about .about-eco-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-cta {
  margin-top: 48px;
  padding: 30px 26px;
  background: var(--clr-deep);
  border-left: 6px solid var(--clr-orange);
}

.page-about .about-cta-text {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: #fff;
}

.page-about .about-cta-link {
  color: var(--clr-orange);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid var(--clr-orange);
  transition: color var(--transition);
}

.page-about .about-cta-link:hover,
.page-about .about-cta-link:focus-visible {
  color: var(--clr-cyan);
  border-bottom-color: var(--clr-cyan);
  outline: none;
}

/* ===== 桌面端 ===== */
@media (min-width: 768px) {
  .page-about .about-breadcrumb {
    padding: 24px 0 8px;
  }

  .page-about .about-hero {
    padding: 72px 0 88px;
  }

  .page-about .about-hero-inner {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 48px;
    align-items: end;
  }

  .page-about .about-hero-index {
    grid-template-columns: 1fr;
    margin-top: 0;
    padding-top: 0;
    padding-left: 24px;
    border-top: none;
    border-left: 2px solid var(--clr-deep);
  }

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

  .page-about .about-section-title {
    font-size: 38px;
  }

  .page-about .about-platform-grid {
    grid-template-columns: 1.1fr 1fr;
    gap: 52px;
  }

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

  .page-about .about-timeline {
    margin-top: 56px;
  }

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

  .page-about .about-timeline-item {
    width: 50%;
    padding-left: 0;
    padding-right: 48px;
    text-align: right;
  }

  .page-about .about-timeline-item:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 48px;
    text-align: left;
  }

  .page-about .about-timeline-dot {
    left: auto;
    right: -7px;
  }

  .page-about .about-timeline-item:nth-child(even) .about-timeline-dot {
    right: auto;
    left: -7px;
  }

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

  .page-about .about-eco-grid {
    grid-template-columns: 1fr 1fr;
    gap: 52px;
    align-items: center;
  }

  .page-about .about-cta {
    padding: 40px 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation: none !important;
  }
}