.page-about {
  background: var(--c-soft);
  color: var(--c-primary);
  overflow-x: hidden;
}

.page-about ::selection {
  background: var(--c-accent);
  color: var(--c-primary);
}

/* ---------- 英雄区域 ---------- */
.page-about-hero {
  position: relative;
  background:
    radial-gradient(circle at 84% 20%, rgba(255, 215, 0, .22), transparent 38%),
    linear-gradient(155deg, var(--c-primary) 0%, #152C54 55%, var(--c-dark) 100%);
  color: var(--c-white);
  padding: 72px 0 60px;
  overflow: hidden;
}

.page-about-hero::before {
  content: "";
  position: absolute;
  top: 24px;
  right: -16px;
  width: 220px;
  height: 120px;
  background: repeating-linear-gradient(-45deg, rgba(255, 215, 0, .3) 0 6px, transparent 6px 14px);
  opacity: .5;
  transform: rotate(12deg);
  pointer-events: none;
}

.page-about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--c-accent) 0 30%, var(--c-red) 30% 62%, var(--c-cyan) 62% 100%);
}

.page-about-hero .breadcrumbs {
  position: relative;
  z-index: 2;
  color: var(--c-muted);
  margin-bottom: 36px;
  font-size: 14px;
}

.page-about-hero .breadcrumbs a {
  color: var(--c-white);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}

.page-about-hero .breadcrumbs a:hover {
  border-bottom-color: var(--c-accent);
}

.page-about-hero_inner {
  display: grid;
  gap: 44px;
  position: relative;
  z-index: 2;
}

.page-about-hero_kicker {
  display: inline-block;
  background: var(--c-red);
  color: var(--c-white);
  font-family: var(--font-headline);
  font-style: italic;
  font-size: 13px;
  letter-spacing: .1em;
  padding: 8px 14px;
  border-radius: 4px;
  margin: 0 0 18px;
  text-transform: uppercase;
}

.page-about-hero_copy h1 {
  font-family: var(--font-headline);
  font-style: italic;
  font-weight: 800;
  font-size: 36px;
  line-height: 1.06;
  margin: 0 0 18px;
  max-width: 720px;
}

.page-about-hero_hl {
  position: relative;
  display: inline-block;
  color: var(--c-accent);
  padding: 0 4px;
  z-index: 0;
}

.page-about-hero_hl::before {
  content: "";
  position: absolute;
  left: -4px;
  right: -4px;
  bottom: 4px;
  height: 12px;
  background: var(--c-red);
  z-index: -1;
  transform: skewX(-12deg);
  border-radius: 2px;
  opacity: .3;
}

.page-about-hero_copy .site-lede {
  color: var(--c-muted);
  max-width: 680px;
  margin: 0;
}

.page-about-hero_stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 0;
}

.page-about-hero_stat {
  background: rgba(255, 255, 255, .07);
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 14px;
  padding: 16px 14px;
  backdrop-filter: blur(4px);
}

.page-about-hero_stat:last-child {
  grid-column: 1 / -1;
}

.page-about-hero_stat dt {
  font-size: 12px;
  color: var(--c-muted);
  letter-spacing: .06em;
  margin-bottom: 6px;
}

.page-about-hero_stat dd {
  font-family: var(--font-headline);
  font-style: italic;
  font-weight: 800;
  font-size: 32px;
  line-height: 1;
  color: var(--c-accent);
  margin: 0;
}

.page-about-hero_stat small {
  font-family: var(--font-body);
  font-style: normal;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-muted);
  margin-left: 2px;
}

/* ---------- 品牌手册布局 ---------- */
.page-about-layout {
  display: block;
  padding-top: 0;
}

.page-about-index {
  position: relative;
  z-index: 6;
  background: var(--c-primary);
  color: var(--c-white);
  border-radius: 18px;
  padding: 20px 18px;
  margin-top: -28px;
  margin-bottom: 0;
  border-bottom: 4px solid var(--c-accent);
  box-shadow: 0 16px 32px rgba(11, 29, 58, .18);
}

.page-about-index_title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin: 0 0 14px;
}

.page-about-index_list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about-index_list li {
  margin: 0;
}

.page-about-index_list a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .08);
  border: 1px solid transparent;
  color: var(--c-white);
  text-decoration: none;
  font-size: 14px;
  transition: background .2s, color .2s, border-color .2s;
}

.page-about-index_list a span {
  color: var(--c-accent);
  font-weight: 800;
  font-size: 12px;
}

.page-about-index_list a:hover,
.page-about-index_list a:focus {
  background: var(--c-accent);
  color: var(--c-primary);
  border-color: var(--c-accent);
}

.page-about-index_list a:hover span,
.page-about-index_list a:focus span {
  color: var(--c-primary);
}

.page-about-index_note {
  display: none;
}

/* ---------- 章节通用 ---------- */
.page-about-content {
  padding-top: 56px;
}

.page-about-section {
  margin-bottom: 72px;
}

.page-about-section_head {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 28px;
}

.page-about-section_index {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 52px;
  height: 52px;
  padding: 0 12px;
  background: var(--c-accent);
  color: var(--c-primary);
  border-radius: 10px 18px 10px 18px;
  box-shadow: 5px 5px 0 var(--c-red);
  font-family: var(--font-headline);
  font-style: italic;
  font-weight: 800;
  font-size: 20px;
  line-height: 1;
  transform: rotate(-2deg);
}

.page-about-section_head > div {
  flex: 1;
}

.page-about-section_head h2 {
  font-family: var(--font-headline);
  font-style: italic;
  font-weight: 800;
  font-size: 30px;
  line-height: 1.1;
  margin: 0 0 8px;
  color: var(--c-primary);
}

.page-about-section_head .site-lede {
  margin: 0;
  font-size: 15px;
  color: var(--c-primary);
  opacity: .72;
  max-width: 560px;
}

/* ---------- 01 品牌理念 ---------- */
.page-about-principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

.page-about-principle {
  background: var(--c-white);
  border-radius: 18px;
  padding: 24px 22px;
  border: 1px solid var(--c-muted);
  box-shadow: 0 8px 24px rgba(11, 29, 58, .04);
  transition: transform .2s, box-shadow .2s;
}

.page-about-principle:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 28px rgba(11, 29, 58, .08);
}

.page-about-principle_icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 12px;
}

.page-about-principle:nth-child(1) .page-about-principle_icon {
  background: var(--c-accent);
  color: var(--c-primary);
}

.page-about-principle:nth-child(2) .page-about-principle_icon {
  background: var(--c-primary);
  color: var(--c-accent);
}

.page-about-principle:nth-child(3) .page-about-principle_icon {
  background: var(--c-red);
  color: var(--c-white);
}

.page-about-principle:nth-child(4) .page-about-principle_icon {
  background: var(--c-cyan);
  color: var(--c-primary);
}

.page-about-principle h3 {
  font-family: var(--font-headline);
  font-style: italic;
  font-size: 24px;
  margin: 16px 0 8px;
  color: var(--c-primary);
}

.page-about-principle p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--c-primary);
  opacity: .76;
}

.page-about-boundary {
  margin-top: 24px;
  padding: 18px 20px;
  background: var(--c-white);
  border-radius: 14px;
  border-left: 6px solid var(--c-red);
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-primary);
  opacity: .84;
}

.page-about-boundary strong {
  color: var(--c-red);
  font-weight: 800;
  margin-right: 6px;
}

.page-about-boundary p {
  display: inline;
  margin: 0;
}

.page-about-picture {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 44px rgba(11, 29, 58, .16);
  background: var(--c-primary);
  margin-top: 24px;
}

.page-about-picture img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

/* ---------- 02 发展里程碑 ---------- */
.page-about-banner {
  margin: 0 0 32px;
  border-radius: 22px;
  overflow: hidden;
  background: var(--c-primary);
}

.page-about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

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

.page-about-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 15px;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--c-accent) 0%, var(--c-red) 60%, var(--c-cyan) 100%);
}

.page-about-timeline_item {
  position: relative;
  padding-left: 52px;
  padding-bottom: 36px;
}

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

.page-about-timeline_dot {
  position: absolute;
  left: 7px;
  top: 6px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--c-primary);
  border: 5px solid var(--c-accent);
  box-shadow: 0 0 0 6px rgba(255, 215, 0, .2);
}

.page-about-timeline_year {
  display: inline-block;
  font-family: var(--font-headline);
  font-style: italic;
  font-weight: 800;
  font-size: 30px;
  line-height: 1;
  color: var(--c-red);
  background: rgba(230, 57, 70, .08);
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 10px;
}

.page-about-timeline_item h3 {
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--c-primary);
}

.page-about-timeline_item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-primary);
  opacity: .74;
}

/* ---------- 03 服务覆盖 ---------- */
.page-about-coverage {
  margin: 0 0 28px;
  border-top: 3px solid var(--c-muted);
}

.page-about-coverage > div {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--c-muted);
}

.page-about-coverage dt {
  flex: 1;
  border-bottom: 2px dotted var(--c-muted);
  padding-bottom: 8px;
  font-weight: 600;
  font-size: 15px;
  color: var(--c-primary);
}

.page-about-coverage dd {
  flex: 0 0 auto;
  margin: 0;
  font-family: var(--font-headline);
  font-style: italic;
  font-weight: 800;
  font-size: 34px;
  line-height: 1;
  color: var(--c-red);
}

.page-about-sports {
  margin-top: 28px;
  background: var(--c-white);
  border: 1px solid var(--c-muted);
  border-radius: 20px;
  padding: 26px 22px;
}

.page-about-sports h3 {
  font-family: var(--font-headline);
  font-style: italic;
  font-size: 20px;
  margin: 0 0 10px;
  color: var(--c-primary);
}

.page-about-sports h3:not(:first-child) {
  margin-top: 24px;
}

.page-about-sports p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-primary);
  opacity: .76;
}

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

.page-about-sports li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-primary);
}

.page-about-sports li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--c-accent);
  border-radius: 2px;
  transform: rotate(45deg);
}

.page-about-sports li:nth-child(2)::before {
  background: var(--c-red);
}

.page-about-sports li:nth-child(3)::before {
  background: var(--c-cyan);
}

/* ---------- 04 资质认证 ---------- */
.page-about-cert-row {
  display: grid;
  gap: 28px;
  align-items: center;
}

.page-about-cert-visual {
  text-align: center;
}

.page-about-cert-media {
  border-radius: 20px;
  overflow: hidden;
  background: var(--c-primary);
  display: inline-block;
  width: 100%;
  max-width: 360px;
  box-shadow: 0 18px 36px rgba(11, 29, 58, .18);
}

.page-about-cert-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about-cert-caption {
  margin: 12px 0 0;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--c-primary);
  opacity: .6;
}

.page-about-cert-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about-cert-list li {
  background: var(--c-white);
  border-left: 6px solid var(--c-accent);
  border-radius: 4px 18px 18px 4px;
  padding: 20px 22px;
  box-shadow: 0 8px 24px rgba(11, 29, 58, .06);
}

.page-about-cert-list li:nth-child(2) {
  border-left-color: var(--c-red);
}

.page-about-cert-list strong {
  display: block;
  font-size: 17px;
  color: var(--c-primary);
  margin-bottom: 6px;
}

.page-about-cert-list span {
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-primary);
  opacity: .72;
}

/* ---------- 05 合作生态 ---------- */
.page-about-ecology {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-about-ecology > div {
  background: var(--c-white);
  border-radius: 18px;
  padding: 26px 24px;
  border-top: 5px solid var(--c-cyan);
  box-shadow: 0 8px 24px rgba(11, 29, 58, .05);
}

.page-about-ecology > div:nth-child(2) {
  border-top-color: var(--c-accent);
}

.page-about-ecology > div:nth-child(3) {
  border-top-color: var(--c-red);
}

.page-about-ecology h3 {
  font-family: var(--font-headline);
  font-style: italic;
  font-size: 22px;
  margin: 0 0 12px;
  color: var(--c-primary);
}

.page-about-ecology p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-primary);
  opacity: .76;
}

/* ---------- 行动号召 ---------- */
.page-about-cta {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 12% 24%, rgba(255, 215, 0, .18), transparent 40%),
    radial-gradient(circle at 88% 80%, rgba(0, 229, 255, .16), transparent 40%),
    var(--c-primary);
  color: var(--c-white);
  padding: 64px 0 72px;
}

.page-about-cta::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-red) 50%, var(--c-cyan) 100%);
}

.page-about-cta_inner {
  position: relative;
  z-index: 2;
}

.page-about-cta_kicker {
  font-family: var(--font-headline);
  font-style: italic;
  font-size: 14px;
  letter-spacing: .12em;
  color: var(--c-accent);
  margin: 0 0 14px;
  text-transform: uppercase;
}

.page-about-cta h2 {
  font-family: var(--font-headline);
  font-style: italic;
  font-weight: 800;
  font-size: 34px;
  line-height: 1.1;
  margin: 0 0 16px;
}

.page-about-cta p {
  max-width: 560px;
  margin: 0 0 30px;
  color: var(--c-muted);
  font-size: 16px;
  line-height: 1.7;
}

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

.page-about-cta_links .site-btn--outline {
  border-color: var(--c-white);
  color: var(--c-white);
}

.page-about-cta_links .site-btn--outline:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about-hero h1 {
    font-size: 48px;
  }

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

  .page-about-hero_stat:last-child {
    grid-column: auto;
  }

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

  .page-about-cert-row {
    grid-template-columns: 1fr 1.2fr;
    gap: 40px;
  }

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

  .page-about-ecology > div:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about-hero {
    padding: 80px 0 72px;
  }

  .page-about-hero h1 {
    font-size: 54px;
  }

  .page-about-layout {
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about-index {
    position: sticky;
    top: 28px;
    padding: 24px 20px;
    margin-top: 0;
    background: var(--c-white);
    color: var(--c-primary);
    border: 1px solid var(--c-muted);
    box-shadow: 0 12px 30px rgba(11, 29, 58, .08);
    border-radius: 18px;
  }

  .page-about-index_title {
    color: var(--c-red);
  }

  .page-about-index_list {
    display: block;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-about-index_list li {
    margin-bottom: 4px;
  }

  .page-about-index_list a {
    display: flex;
    width: 100%;
    background: transparent;
    border-radius: 10px;
    color: var(--c-primary);
    padding: 12px 14px;
    font-size: 15px;
    font-weight: 500;
  }

  .page-about-index_list a span {
    color: var(--c-red);
    font-weight: 800;
    font-size: 14px;
  }

  .page-about-index_list a:hover,
  .page-about-index_list a:focus {
    background: var(--c-soft);
    color: var(--c-primary);
    border-color: transparent;
  }

  .page-about-index_note {
    display: block;
    margin-top: 24px;
    padding-top: 18px;
    border-top: 1px solid var(--c-muted);
    font-size: 14px;
    line-height: 1.65;
    color: var(--c-primary);
    opacity: .78;
  }

  .page-about-index_note p:first-child {
    font-weight: 700;
    opacity: 1;
    color: var(--c-primary);
  }

  .page-about-index_note a {
    display: inline-block;
    margin-top: 12px;
    color: var(--c-red);
    font-weight: 700;
    text-decoration: none;
    border-bottom: 2px solid var(--c-accent);
  }

  .page-about-content {
    padding-top: 0;
  }

  .page-about-section {
    margin-bottom: 96px;
    padding-top: 32px;
    border-top: 1px solid var(--c-muted);
  }

  .page-about-banner img {
    aspect-ratio: 3 / 1;
  }

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

  .page-about-ecology > div:last-child {
    grid-column: auto;
  }
}