/* ==========================================================
   买球中国 · 品牌概况页（/profile/）专属样式
   作用域：.page-about
   ========================================================== */
.page-about {
  --about-ease: cubic-bezier(0.22, 1, 0.36, 1);
  background: var(--paper);
  color: var(--ink);
}

.page-about .breadcrumb {
  background: var(--paper);
  border-bottom: 1px solid var(--sand);
  padding: 0.75rem 0;
  margin: 0;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--size-caption);
  color: var(--pitch);
}

.page-about .breadcrumb a {
  color: var(--pitch);
  text-decoration: none;
  font-weight: 600;
}

.page-about .breadcrumb a:hover {
  color: var(--gold);
}

/* 章节通用 */
.page-about__section-head {
  margin-bottom: 2rem;
  max-width: 720px;
}

.page-about__section-title {
  margin: 0.25rem 0 0.625rem;
  font-family: var(--font-heading);
  font-size: var(--size-h2);
  line-height: var(--line-h2);
  color: var(--ink);
}

.page-about__section-intro {
  margin: 0;
  font-size: 1rem;
  line-height: var(--line-body);
  color: var(--ink);
  opacity: 0.82;
}

.page-about__chapter-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--gold);
  border: 1px solid var(--gold);
  border-radius: var(--radius-pill);
  padding: 0.25rem 0.75rem;
  line-height: 1.2;
  letter-spacing: 0.08em;
  margin-bottom: 0.625rem;
}

.page-about__kicker {
  margin: 0 0 0.375rem;
  font-family: var(--font-mono);
  font-size: var(--size-caption);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 700;
}

.page-about__research-note {
  margin: 0 0 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--gold);
  opacity: 0.9;
}

/* 品牌故事 */
.page-about__story {
  position: relative;
  padding: 2.5rem 0 3rem;
}

.page-about__story::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 38%;
  height: 8px;
  background: linear-gradient(90deg, transparent, var(--gold), var(--orange));
  border-radius: 0 0 0 8px;
}

.page-about__story-layout {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.page-about__hero-title {
  margin: 0 0 1.25rem;
  font-family: var(--font-heading);
  font-size: var(--size-hero);
  line-height: var(--line-hero);
  color: var(--ink);
}

.page-about__lede {
  margin: 0 0 1.125rem;
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--pitch);
}

.page-about__story-body p {
  margin: 0 0 0.875rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink);
  opacity: 0.85;
}

.page-about__story-points {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
}

.page-about__story-point {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: var(--pitch);
  color: var(--bone);
  border-radius: var(--radius-pill);
  padding: 0.5rem 1rem;
  font-size: var(--size-caption);
  font-weight: 700;
  line-height: 1.4;
}

.page-about__story-point svg {
  width: 16px;
  height: 16px;
  flex: none;
  stroke: var(--gold);
}

.page-about__story-point svg circle {
  stroke: var(--gold);
}

.page-about__story-visual {
  position: relative;
  margin: 0;
}

.page-about__story-visual::before {
  content: "";
  position: absolute;
  inset: 12px -10px -10px 12px;
  border: 2px dashed var(--gold);
  border-radius: var(--radius-md);
  z-index: 0;
}

.page-about__story-visual::after {
  content: "2012—";
  position: absolute;
  top: -0.5rem;
  right: 0.75rem;
  z-index: 2;
  background: var(--pitch);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--gold);
}

.page-about__story-img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 2px solid var(--pitch);
}

.page-about__story-visual figcaption {
  position: relative;
  z-index: 1;
  margin-top: 0.625rem;
  font-size: var(--size-caption);
  line-height: 1.5;
  color: var(--ink);
  opacity: 0.7;
}

/* 关键历程 */
.page-about__timeline {
  background: var(--bone);
  padding: 3.5rem 0;
}

.page-about__timeline-grid {
  display: grid;
  gap: 2rem;
}

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

.page-about__timeline-list::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: repeating-linear-gradient(to bottom, var(--gold) 0 2px, transparent 2px 8px);
}

.page-about__milestone {
  position: relative;
  padding-left: 2.25rem;
  margin-bottom: 0.75rem;
}

.page-about__milestone::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 1.375rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gold);
  border: 3px solid var(--bone);
  box-shadow: 0 0 0 2px var(--gold);
  z-index: 1;
}

.page-about__milestone-details {
  background: var(--bone);
  border: 1px solid var(--sand);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.page-about__milestone-details[open] {
  border-color: var(--gold);
  box-shadow: 0 4px 12px rgba(11, 61, 46, 0.06);
}

.page-about__milestone-details summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  list-style: none;
}

.page-about__milestone-details summary::-webkit-details-marker {
  display: none;
}

.page-about__milestone-year {
  font-family: var(--font-mono);
  font-size: var(--size-h3);
  font-weight: 700;
  color: var(--gold);
  line-height: 1.2;
  min-width: 3.2em;
}

.page-about__milestone-title {
  font-weight: 800;
  color: var(--ink);
}

.page-about__milestone-details p {
  margin: 0.75rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--sand);
  font-size: var(--size-caption);
  line-height: var(--line-body);
  color: var(--ink);
  opacity: 0.82;
}

.page-about__timeline-visual {
  margin: 0;
}

.page-about__timeline-visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--sand);
}

.page-about__timeline-visual figcaption {
  margin-top: 0.625rem;
  font-size: var(--size-caption);
  line-height: 1.5;
  color: var(--ink);
  opacity: 0.7;
}

.page-about__timeline-note {
  margin: 1.75rem 0 0;
  font-size: var(--size-caption);
  color: var(--ink);
  opacity: 0.75;
}

.page-about__timeline-note a {
  color: var(--pitch);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* 数据能力 */
.page-about__capability {
  position: relative;
  overflow: hidden;
  background: var(--pitch);
  color: var(--bone);
  padding: 3.5rem 0;
}

.page-about__capability-texture {
  position: absolute;
  inset: 0;
  z-index: 0;
  margin: 0;
  opacity: 0.16;
  pointer-events: none;
}

.page-about__capability-texture img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about__capability-inner {
  position: relative;
  z-index: 1;
}

.page-about__section-head--light .page-about__section-title {
  color: var(--bone);
}

.page-about__section-head--light .page-about__section-intro {
  color: var(--bone);
  opacity: 0.85;
}

.page-about__section-head--light .page-about__kicker {
  color: var(--gold);
}

.page-about__stats-grid {
  display: grid;
  gap: 0.875rem;
}

.page-about__stat-card {
  background: rgba(252, 250, 244, 0.07);
  border: 1px solid rgba(252, 250, 244, 0.16);
  border-radius: var(--radius-lg);
  padding: 1.375rem 1.5rem;
  position: relative;
  overflow: hidden;
  transition: background 0.25s, border-color 0.25s, transform 0.25s;
}

.page-about__stat-card:hover {
  background: rgba(252, 250, 244, 0.12);
  border-color: var(--gold);
  transform: translateY(-2px);
}

.page-about__stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-about__stat-label {
  display: inline-block;
  margin-top: 0.75rem;
  font-weight: 800;
  color: var(--bone);
}

.page-about__stat-hint {
  margin: 0.5rem 0 0;
  font-size: var(--size-caption);
  line-height: 1.5;
  color: var(--bone);
  opacity: 0.75;
}

.page-about__stat-detail {
  margin: 0.625rem 0 0;
  padding-top: 0.5rem;
  border-top: 1px dashed rgba(201, 162, 39, 0.5);
  font-size: var(--size-caption);
  line-height: 1.55;
  color: var(--gold-soft);
}

/* 团队与组织 */
.page-about__team {
  background: var(--paper);
  padding: 3.5rem 0;
}

.page-about__team-grid {
  display: grid;
  gap: 0.875rem;
}

.page-about__team-card {
  position: relative;
  overflow: hidden;
  background: var(--bone);
  border: 1px solid var(--sand);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: transform 0.25s var(--about-ease), box-shadow 0.25s var(--about-ease);
}

.page-about__team-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(11, 61, 46, 0.1);
}

.page-about__team-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--pitch);
  color: var(--gold);
  margin-bottom: 1rem;
}

.page-about__team-icon svg {
  width: 26px;
  height: 26px;
  stroke: var(--gold);
}

.page-about__team-card h3 {
  margin: 0 0 0.5rem;
  font-size: var(--size-h3);
  color: var(--ink);
}

.page-about__team-card p {
  margin: 0;
  font-size: var(--size-caption);
  line-height: var(--line-body);
  color: var(--ink);
  opacity: 0.82;
}

.page-about__team-num {
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gold);
  opacity: 0.65;
}

.page-about__team-total {
  margin: 1.75rem 0 0;
  text-align: center;
  font-size: var(--size-caption);
  color: var(--ink);
  opacity: 0.75;
  line-height: 1.6;
}

/* 资质与认证 */
.page-about__certification {
  background: var(--sand);
  padding: 3.5rem 0;
}

.page-about__cert-grid {
  display: grid;
  gap: 0.875rem;
}

.page-about__seal-card {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  background: var(--bone);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.page-about__stamp {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 76px;
  height: 76px;
  border-radius: 50%;
  border: 2px dashed var(--gold);
  background: var(--gold-soft);
  font-family: var(--font-heading);
  font-size: 1.75rem;
  color: var(--pitch);
}

.page-about__seal-body h3 {
  margin: 0 0 0.375rem;
  color: var(--ink);
  font-size: var(--size-h3);
}

.page-about__seal-code {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--pitch);
}

.page-about__seal-body p {
  margin: 0;
  font-size: var(--size-caption);
  line-height: var(--line-body);
  color: var(--ink);
  opacity: 0.82;
}

.page-about__cert-card {
  background: var(--bone);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.page-about__cert-card h3 {
  margin: 0 0 0.5rem;
  color: var(--ink);
  font-size: var(--size-h3);
}

.page-about__cert-card p {
  margin: 0;
  font-size: var(--size-caption);
  line-height: var(--line-body);
  color: var(--ink);
  opacity: 0.82;
}

.page-about__cert-card .page-about__cert-more {
  margin-top: 0.625rem;
}

.page-about__cert-card a {
  color: var(--pitch);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* 合作生态 */
.page-about__ecosystem {
  background: var(--bone);
  padding: 3.5rem 0;
}

.page-about__ecosystem-grid {
  display: grid;
  gap: 0.875rem;
}

.page-about__eco-card {
  background: var(--paper);
  border: 1px solid var(--sand);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: transform 0.25s var(--about-ease), box-shadow 0.25s var(--about-ease);
}

.page-about__eco-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(11, 61, 46, 0.08);
}

.page-about__eco-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--pitch);
  color: var(--gold);
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.page-about__eco-card h3 {
  margin: 0 0 0.5rem;
  font-size: var(--size-h3);
  color: var(--ink);
}

.page-about__eco-card p {
  margin: 0;
  font-size: var(--size-caption);
  line-height: var(--line-body);
  color: var(--ink);
  opacity: 0.82;
}

.page-about__trust-note {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  background: var(--gold-soft);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-top: 1.5rem;
}

.page-about__trust-note svg {
  flex: none;
  width: 18px;
  height: 18px;
  margin-top: 2px;
  color: var(--pitch);
  stroke: currentColor;
}

.page-about__trust-note p {
  margin: 0;
  font-size: var(--size-caption);
  line-height: var(--line-body);
  color: var(--ink);
}

/* 延伸导航 */
.page-about__next {
  background: var(--paper);
  padding: 3rem 0 4rem;
}

.page-about__next-card {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  background: var(--bone);
  border: 2px solid var(--pitch);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.page-about__next-card h2 {
  margin: 0.25rem 0 0.5rem;
  font-family: var(--font-heading);
  font-size: var(--size-h3);
  color: var(--ink);
}

.page-about__next-card p {
  margin: 0;
  font-size: var(--size-caption);
  line-height: var(--line-body);
  color: var(--ink);
  opacity: 0.8;
}

.page-about__next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
}

/* 平板适配 */
@media (min-width: 700px) {
  .page-about__stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

/* 桌面适配 */
@media (min-width: 1024px) {
  .page-about__story-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
  }

  .page-about__timeline-grid {
    grid-template-columns: minmax(0, 1fr) 340px;
    align-items: start;
  }

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

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

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

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

  .page-about__next-card {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about__next-card > div:first-child {
    max-width: 480px;
  }

  .page-about__stat-detail {
    display: none;
  }

  .page-about__stat-card:hover .page-about__stat-detail,
  .page-about__stat-card:focus-within .page-about__stat-detail {
    display: block;
  }
}