.page-about {
  --about-panel-border: rgba(42, 42, 42, 0.38);
  background-color: var(--c-light-gray);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 14px 20px 0;
  max-width: var(--page-maxw);
  margin: 0 auto;
  font-size: 13px;
  color: var(--c-mid-gray);
  font-family: var(--font-body);
}

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

/* 品牌使命 Hero */
.page-about .about-hero {
  position: relative;
  padding: 28px 20px 48px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(128deg, #0A0A0A 0%, #141414 52%, #1C0A0C 100%);
  background-size: 48px 48px, 48px 48px, auto;
}

.page-about .about-hero-inner {
  max-width: var(--page-maxw);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .about-hero-copy {
  color: #fff;
  animation: aboutFadeUp 0.7s var(--speed-ease) both;
}

.page-about .about-hero .coord-label {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-gold-soft);
  border: 1px solid rgba(255, 215, 0, 0.35);
  background: rgba(255, 215, 0, 0.06);
  padding: 6px 12px;
  margin-bottom: 18px;
}

.page-about .about-hero-copy h1 {
  font-family: var(--font-head);
  font-size: 30px;
  line-height: 1.12;
  margin: 0 0 18px;
  color: #fff;
}

.page-about .about-hero-lead {
  font-size: 16px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.78);
  max-width: 54ch;
  margin: 0 0 28px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero-visual {
  animation: aboutFadeIn 0.8s var(--speed-ease) 0.15s both;
}

.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: var(--shadow-card);
}

/* 区块通用头部 */
.page-about .about-section-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  max-width: var(--page-maxw);
  margin-left: auto;
  margin-right: auto;
  padding: 0 20px;
  margin-bottom: 28px;
}

.page-about .about-section-head .panel-index {
  margin-top: 6px;
  flex-shrink: 0;
}

.page-about .about-section-head-copy {
  flex: 1;
}

.page-about .about-section-head h2 {
  font-family: var(--font-head);
  font-size: 28px;
  line-height: 1.2;
  margin: 0;
  color: var(--c-text-dark);
}

.page-about .section-note {
  margin: 8px 0 0;
  color: var(--c-mid-gray);
  font-size: 14px;
  line-height: 1.6;
}

/* 品牌使命区 */
.page-about .about-mission,
.page-about .about-timeline,
.page-about .about-coverage {
  padding: 56px 0;
}

.page-about .about-mission-grid {
  display: grid;
  gap: 24px;
  max-width: var(--page-maxw);
  margin: 0 auto;
  padding: 0 20px;
}

.page-about .mission-card {
  position: relative;
  padding: 28px;
  background: #fff;
}

.page-about .mission-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 64px;
  background: var(--grad-red);
}

.page-about .mission-id {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-primary);
  margin-bottom: 14px;
  border-bottom: 1px solid rgba(225, 6, 0, 0.3);
  padding-bottom: 4px;
}

.page-about .mission-card h3 {
  font-family: var(--font-head);
  font-size: 18px;
  margin: 0 0 12px;
  color: var(--c-text-dark);
}

.page-about .mission-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-mid-gray);
  margin: 0;
}

/* 发展历程 */
.page-about .about-timeline {
  background: #ffffff;
}

.page-about .timeline-shell {
  max-width: var(--page-maxw);
  margin: 0 auto;
  padding: 0 20px;
}

.page-about .timeline-rail {
  display: none;
}

.page-about .timeline-nodes {
  display: grid;
  gap: 0;
}

.page-about .timeline-phase {
  position: relative;
  padding-left: 44px;
  margin-bottom: 28px;
}

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

.page-about .timeline-phase::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 18px;
  bottom: -28px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-primary), var(--c-gold));
}

.page-about .timeline-phase:last-child::before {
  bottom: auto;
  height: calc(100% - 18px + 24px);
}

.page-about .phase-node {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--c-dark);
  color: var(--c-gold);
  font-size: 13px;
  border: 2px solid var(--c-gold);
}

.page-about .phase-card {
  padding: 24px;
  background: var(--c-light-gray);
  margin-bottom: 0;
}

.page-about .phase-tag {
  font-size: 12px;
  color: var(--c-primary);
  letter-spacing: 0.12em;
  margin: 0 0 10px;
}

.page-about .phase-card h3 {
  font-size: 18px;
  font-family: var(--font-head);
  margin: 0 0 10px;
  color: var(--c-text-dark);
}

.page-about .phase-card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-mid-gray);
  margin: 0;
}

/* 服务数据 */
.page-about .about-metrics {
  padding: 56px 0;
  color: var(--c-text-light);
  background:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    radial-gradient(circle at 16% 12%, rgba(255, 215, 0, 0.10), transparent 34%),
    var(--grad-darkred);
  background-size: 44px 44px, 44px 44px, auto, auto;
}

.page-about .about-metrics .about-section-head h2 {
  color: #fff;
}

.page-about .about-metrics .section-note {
  color: rgba(255, 255, 255, 0.66);
}

.page-about .metrics-panel {
  max-width: var(--page-maxw);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  gap: 28px;
}

.page-about .metrics-visual {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow-card);
}

.page-about .metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.page-about .metric-card {
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: 8px;
  padding: 20px 14px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 8px;
  justify-content: center;
}

.page-about .metric-num {
  font-size: 30px;
  font-weight: 800;
  color: var(--c-gold);
  line-height: 1.1;
}

.page-about .metric-label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.72);
}

/* 赛事覆盖 */
.page-about .coverage-layout {
  max-width: var(--page-maxw);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  gap: 32px;
}

.page-about .coverage-visual {
  margin: 0;
  padding: 12px;
  background: #fff;
}

.page-about .coverage-visual img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  display: block;
}

.page-about .coverage-visual figcaption {
  margin-top: 10px;
  font-size: 12px;
  color: var(--c-mid-gray);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.page-about .coverage-content {
  display: grid;
  gap: 18px;
}

.page-about .coverage-card {
  position: relative;
  padding: 22px 24px;
  background: #fff;
}

.page-about .coverage-card:nth-child(1) {
  border-left: 4px solid var(--c-primary);
}

.page-about .coverage-card:nth-child(2) {
  border-left: 4px solid var(--c-gold);
}

.page-about .coverage-card:nth-child(3) {
  border-left: 4px solid var(--c-data-green);
}

.page-about .coverage-id {
  font-size: 11px;
  color: var(--c-primary);
  letter-spacing: 0.12em;
}

.page-about .coverage-card h3 {
  font-family: var(--font-head);
  font-size: 17px;
  margin: 8px 0 8px;
  color: var(--c-text-dark);
}

.page-about .coverage-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-mid-gray);
  margin: 0;
}

.page-about .coverage-link-row {
  text-align: right;
}

.page-about .coverage-link-row a {
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--c-gold);
  padding-bottom: 2px;
}

/* 资质与合作 */
.page-about .about-cert {
  padding: 56px 0;
  color: #fff;
  background:
    linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    radial-gradient(circle at 82% 18%, rgba(255, 215, 0, 0.12), transparent 36%),
    linear-gradient(135deg, #0A0A0A 0%, #181010 58%, #0E1116 100%);
  background-size: 44px 44px, 44px 44px, auto, auto;
}

.page-about .about-cert .about-section-head h2 {
  color: #fff;
}

.page-about .about-cert .section-note {
  color: rgba(255, 255, 255, 0.66);
}

.page-about .cert-layout {
  max-width: var(--page-maxw);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  gap: 28px;
}

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

.page-about .cert-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: 8px;
}

.page-about .cert-check {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--c-data-green);
  color: #0A0A0A;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 900;
  flex-shrink: 0;
}

.page-about .cert-item h3 {
  font-family: var(--font-head);
  font-size: 16px;
  margin: 0 0 6px;
  color: #fff;
}

.page-about .cert-item p {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.66);
  margin: 0;
}

.page-about .cert-note {
  padding: 24px;
  background: rgba(255, 215, 0, 0.06);
  align-self: start;
}

.page-about .cert-note-id {
  font-size: 11px;
  color: var(--c-gold);
  letter-spacing: 0.16em;
}

.page-about .cert-note p {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.82);
  margin: 12px 0 18px;
}

/* 继续探索 */
.page-about .about-related {
  padding: 56px 20px;
  background: #fff;
}

.page-about .about-related .about-section-head {
  padding: 0;
}

.page-about .related-grid {
  max-width: var(--page-maxw);
  margin: 0 auto;
  display: grid;
  gap: 18px;
}

.page-about .related-card {
  position: relative;
  display: block;
  padding: 24px;
  background: var(--c-light-gray);
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.28s var(--speed-ease), border-color 0.28s var(--speed-ease), top 0.28s var(--speed-ease);
}

.page-about .related-card:hover {
  top: -4px;
  box-shadow: var(--shadow-card);
}

.page-about .related-index {
  font-size: 11px;
  color: var(--c-gold);
  background: var(--c-dark);
  padding: 4px 8px;
  display: inline-block;
  letter-spacing: 0.12em;
}

.page-about .related-card h3 {
  font-family: var(--font-head);
  font-size: 18px;
  margin: 14px 0 8px;
  color: var(--c-text-dark);
}

.page-about .related-card p {
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-mid-gray);
  margin: 0;
}

/* 动画 */
@keyframes aboutFadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes aboutFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* 中等宽度 */
@media (min-width: 640px) {
  .page-about .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .metrics-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 桌面端 */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 40px 28px 88px;
  }

  .page-about .about-hero-inner {
    display: grid;
    grid-template-columns: 1.02fr 0.98fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-hero-copy h1 {
    font-size: 46px;
  }

  .page-about .about-hero-visual img {
    transform: rotate(1.2deg) scale(0.98);
  }

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

  .page-about .about-section-head h2 {
    font-size: 34px;
  }

  .page-about .about-mission-grid {
    grid-template-columns: repeat(3, 1fr);
    align-items: start;
  }

  .page-about .mission-card:nth-child(2) {
    margin-top: 28px;
  }

  .page-about .timeline-shell {
    display: flex;
    gap: 24px;
    align-items: stretch;
  }

  .page-about .timeline-rail {
    display: block;
    flex: 0 0 120px;
    width: 120px;
    align-self: stretch;
    min-height: 680px;
  }

  .page-about .timeline-nodes {
    flex: 1;
  }

  .page-about .timeline-phase {
    display: grid;
    grid-template-columns: 52px 1fr;
    gap: 22px;
    align-items: start;
    padding-left: 0;
  }

  .page-about .timeline-phase::before {
    display: none;
  }

  .page-about .phase-node {
    position: static;
    justify-self: start;
  }

  .page-about .metrics-panel {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 36px;
    align-items: center;
  }

  .page-about .metrics-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .coverage-layout {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 40px;
    align-items: center;
  }

  .page-about .coverage-visual img {
    transform: rotate(-1deg);
  }

  .page-about .cert-layout {
    grid-template-columns: 1.25fr 0.75fr;
    gap: 36px;
    align-items: start;
  }

  .page-about .cert-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .related-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero-copy,
  .page-about .about-hero-visual {
    animation: none;
  }
}