/* ===================== 必发体育中国站 · 品牌概况专属样式 ===================== */

.page-about {
  overflow-x: hidden;
  background: var(--bf-bg);
}

/* ---------- 通用段落眉标与大标题 ---------- */

.page-about__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--bf-font-data);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--bf-gold);
  text-transform: uppercase;
}

.page-about__kicker::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--bf-gold);
  flex: none;
}

.page-about__section-head {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--bf-border);
}

.page-about__section-title {
  margin: 12px 0 16px;
  font-family: var(--bf-font-title);
  font-size: clamp(1.8rem, 0.8rem + 2vw, 2.8rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--bf-cream);
}

.page-about__section-lead {
  margin: 0;
  max-width: 62ch;
  font-family: var(--bf-font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--bf-gray);
}

/* ---------- 01 品牌简介 ---------- */

.page-about__hero {
  padding: 24px 0 64px;
  background:
    linear-gradient(180deg, rgba(212, 175, 55, 0.05) 0%, rgba(12, 45, 38, 0) 100%),
    var(--bf-surface);
  border-bottom: 1px solid var(--bf-border);
}

.page-about__crumb {
  margin-bottom: 28px;
}

.page-about__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

.page-about__hero-copy {
  min-width: 0;
}

.page-about__title {
  margin: 0 0 20px;
  font-family: var(--bf-font-title);
  font-size: clamp(2.1rem, 1rem + 3vw, 3.6rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--bf-cream);
}

.page-about__lead {
  margin: 0 0 24px;
  max-width: 60ch;
  font-family: var(--bf-font-body);
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--bf-cream);
}

.page-about__intro-body {
  display: grid;
  gap: 14px;
  max-width: 62ch;
  margin-bottom: 32px;
  font-family: var(--bf-font-body);
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--bf-gray);
}

.page-about__intro-body p {
  margin: 0;
}

/* 数据统计 */

.page-about__stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about__stat {
  padding: 16px;
  background: var(--bf-bg);
  border: 1px solid var(--bf-border);
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about__stat:hover {
  border-color: var(--bf-gold);
  background: var(--bf-surface);
}

.page-about__stat-num {
  display: block;
  font-family: var(--bf-font-data);
  font-size: clamp(1.8rem, 1.4rem + 1vw, 2.4rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--bf-gold);
}

.page-about__stat-label {
  display: block;
  margin-top: 6px;
  font-family: var(--bf-font-body);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--bf-cream);
}

.page-about__stat-desc {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--bf-border);
  font-family: var(--bf-font-body);
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--bf-gray);
}

/* 品牌配图 */

.page-about__hero-figure {
  position: relative;
  margin: 0;
}

.page-about__hero-figure::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: -10px;
  height: 14px;
  background: var(--bf-gold);
  clip-path: polygon(0 0, 100% 0, 96% 100%, 4% 100%);
  opacity: 0.85;
}

.page-about__hero-img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--bf-border);
  background: var(--bf-surface-light);
}

/* ---------- 02 发展历程 ---------- */

.page-about__timeline {
  padding: 48px 0 72px;
}

.page-about__timeline-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about__timeline-list {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about__timeline-item {
  position: relative;
  padding-left: 32px;
}

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 26px;
  bottom: -20px;
  width: 2px;
  background: var(--bf-border);
}

.page-about__timeline-item:last-child::before {
  display: none;
}

.page-about__timeline-marker {
  position: absolute;
  left: 0;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bf-gold);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.18);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.page-about__timeline-item:hover .page-about__timeline-marker {
  background: var(--bf-gold-light);
  box-shadow: 0 0 0 6px rgba(212, 175, 55, 0.28);
}

.page-about__timeline-card {
  background: var(--bf-surface);
  border: 1px solid var(--bf-border);
  padding: 20px;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about__timeline-item:hover .page-about__timeline-card {
  border-color: var(--bf-gold);
  background: var(--bf-surface-light);
}

.page-about__timeline-era {
  display: inline-block;
  margin-bottom: 10px;
  padding-bottom: 4px;
  font-family: var(--bf-font-data);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--bf-gold);
  border-bottom: 1px solid var(--bf-gold);
}

.page-about__timeline-card h3 {
  margin: 0 0 8px;
  font-family: var(--bf-font-title);
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--bf-cream);
}

.page-about__timeline-card > p {
  margin: 0;
  font-family: var(--bf-font-body);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--bf-gray);
}

.page-about__timeline-detail {
  margin-top: 12px;
  padding: 14px 16px;
  border-left: 3px solid var(--bf-gold);
  background: var(--bf-bg);
}

.page-about__timeline-detail p {
  margin: 0;
  font-family: var(--bf-font-body);
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--bf-gray);
}

.page-about__timeline-figure {
  position: relative;
  margin: 0;
}

.page-about__timeline-figure::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 24px;
  width: 4px;
  height: 56%;
  background: linear-gradient(180deg, var(--bf-gold), var(--bf-red));
}

.page-about__timeline-img,
.page-about__cert-img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--bf-border);
  background: var(--bf-surface);
}

/* ---------- 03 资质与认证 ---------- */

.page-about__cert {
  padding: 48px 0 72px;
  background: var(--bf-surface);
  border-top: 1px solid var(--bf-border);
}

.page-about__cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about__cert-card {
  background: var(--bf-surface-light);
  border: 1px solid var(--bf-border);
  padding: 28px;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about__cert-card:hover {
  border-color: var(--bf-gold);
  background: var(--bf-surface);
}

.page-about__cert-card h3 {
  margin: 18px 0 10px;
  font-family: var(--bf-font-title);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--bf-cream);
}

.page-about__cert-card p {
  margin: 0;
  font-family: var(--bf-font-body);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--bf-gray);
}

.page-about__seal {
  width: 80px;
  height: 80px;
  padding: 6px;
  color: var(--bf-gold);
  background: rgba(212, 175, 55, 0.08);
  border-radius: 50%;
}

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

.page-about__cert-list li {
  position: relative;
  padding-left: 20px;
  font-family: var(--bf-font-body);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--bf-gray);
}

.page-about__cert-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  background: var(--bf-gold);
}

.page-about__notice {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin: 40px 0 32px;
  padding: 14px 18px;
  border-left: 3px solid var(--bf-red);
  background: rgba(139, 37, 0, 0.12);
}

.page-about__notice-tag {
  flex: none;
  font-family: var(--bf-font-data);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--bf-red);
}

.page-about__notice p {
  margin: 0;
  font-family: var(--bf-font-body);
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--bf-cream);
}

/* ---------- 04 服务保障 ---------- */

.page-about__service {
  padding: 48px 0 72px;
}

.page-about__service-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about__service-card {
  background: var(--bf-surface);
  border: 1px solid var(--bf-border);
  padding: 24px;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about__service-card:hover {
  border-color: var(--bf-gold);
  background: var(--bf-surface-light);
}

.page-about__service-num {
  margin: 0 0 10px;
  font-family: var(--bf-font-data);
  font-size: clamp(2rem, 1.6rem + 1vw, 2.8rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--bf-gold);
}

.page-about__service-num span {
  display: block;
  margin-top: 4px;
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--bf-gray);
}

.page-about__service-card h3 {
  margin: 0 0 8px;
  font-family: var(--bf-font-title);
  font-size: 1rem;
  font-weight: 700;
  color: var(--bf-cream);
}

.page-about__service-card p {
  margin: 0;
  font-family: var(--bf-font-body);
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--bf-gray);
}

.page-about__service-card a {
  color: var(--bf-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 175, 55, 0.4);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about__service-card a:hover {
  color: var(--bf-gold-light);
  border-color: var(--bf-gold-light);
}

/* ---------- CTA 区块 ---------- */

.page-about__cta {
  padding: 24px 0 72px;
}

.page-about__cta-box {
  position: relative;
  padding: 64px 16px;
  text-align: center;
  background: linear-gradient(135deg, var(--bf-surface) 0%, var(--bf-surface-light) 100%);
  border-top: 2px solid var(--bf-gold);
  border-bottom: 1px solid var(--bf-gold);
}

.page-about__cta-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--bf-gold) 0%, var(--bf-red) 100%);
}

.page-about__cta-box .page-about__kicker {
  justify-content: center;
}

.page-about__cta-title {
  margin: 0 0 12px;
  font-family: var(--bf-font-title);
  font-size: clamp(1.6rem, 0.8rem + 2vw, 2.2rem);
  font-weight: 900;
  line-height: 1.2;
  color: var(--bf-cream);
}

.page-about__cta-box > p {
  max-width: 46ch;
  margin: 0 auto 28px;
  font-family: var(--bf-font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--bf-gray);
}

.page-about__cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

/* ---------- 响应式增强 ---------- */

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

  .page-about__service-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 960px) {
  .page-about__hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
  }

  .page-about__timeline-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
    align-items: start;
  }

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

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

  /* 桌面端时间线详情默认收起，悬停展开 */
  .page-about__timeline-detail {
    margin-top: 0;
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, opacity 0.35s ease, margin-top 0.35s ease, padding-top 0.35s ease, padding-bottom 0.35s ease;
  }

  .page-about__timeline-item:hover .page-about__timeline-detail,
  .page-about__timeline-item:focus-within .page-about__timeline-detail {
    margin-top: 12px;
    max-height: 200px;
    padding-top: 14px;
    padding-bottom: 14px;
    opacity: 1;
  }
}

@media (min-width: 1200px) {
  .page-about__hero {
    padding-top: 48px;
  }

  .page-about__timeline-detail {
    max-height: 0;
  }

  .page-about__timeline-item:hover .page-about__timeline-detail,
  .page-about__timeline-item:focus-within .page-about__timeline-detail {
    max-height: 180px;
  }

  .page-about__cta-box {
    padding: 80px 32px;
  }
}