/* ====================================================
   PAGE: ABOUT — 完美体育CN官网 品牌档案
   作用域: .page-about
   ==================================================== */
.page-about {
  --about-grid-line: rgba(42, 195, 196, 0.06);
  --about-grid-line-strong: rgba(42, 195, 196, 0.12);
  --about-card-bg: rgba(17, 25, 39, 0.72);
  --about-radius: 16px;
  --about-radius-sm: 12px;
  background-color: var(--bg-deep);
  color: var(--white);
  position: relative;
  overflow-x: clip;
}

/* 全局坐标网格底纹（页面作用域内） */
.page-about .brand-story,
.page-about .timeline-section,
.page-about .tech-section {
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* ========== 面包屑 ========== */
.page-about .breadcrumb {
  padding: 1rem 0;
  border-bottom: 1px solid rgba(42, 195, 196, 0.12);
  background: rgba(10, 14, 23, 0.6);
}

.page-about .breadcrumb-inner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

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

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

.page-about .breadcrumb-sep {
  color: var(--gray);
  font-style: normal;
}

.page-about .breadcrumb span[aria-current="page"] {
  color: var(--white);
  font-weight: 600;
}

/* ========== 区块索引标签 ========== */
.page-about .section-index {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
  background: rgba(42, 195, 196, 0.08);
  border: 1px solid rgba(42, 195, 196, 0.2);
  border-radius: var(--radius-pill);
  padding: 0.3rem 0.85rem;
  margin-bottom: 1rem;
}

.page-about .section-index .index-no {
  color: var(--gold);
  font-weight: 700;
}

.page-about .section-index.light {
  background: rgba(248, 249, 250, 0.08);
  border-color: rgba(248, 249, 250, 0.15);
  color: var(--white);
}

.page-about .section-index.light .index-no {
  color: var(--gold);
}

/* ========== 段落标题基础 ========== */
.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
  color: var(--white);
  margin: 0;
}

.page-about h1 {
  font-size: clamp(1.8rem, 5vw, 3rem);
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
}

.page-about h2 {
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  letter-spacing: -0.01em;
}

.page-about h3 {
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.page-about .section-heading {
  margin-bottom: 2.5rem;
}

.page-about .section-heading h2 {
  margin-bottom: 0.5rem;
}

.page-about .section-sub {
  color: var(--gray);
  font-size: 0.95rem;
  margin: 0;
  max-width: 34em;
  line-height: 1.6;
}

/* ========== 01 品牌定位区 ========== */
.page-about .brand-story {
  position: relative;
  padding: 3.5rem 0 3rem;
}

.page-about .brand-story-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem 3.5rem;
  align-items: center;
}

.page-about .brand-copy .lede {
  font-size: 1.1rem;
  line-height: 1.7;
  color: rgba(248, 249, 250, 0.92);
  margin: 0 0 1.2rem;
  max-width: 28em;
}

.page-about .brand-copy .lede strong {
  color: var(--gold);
  font-weight: 700;
}

.page-about .brand-copy .intro-copy {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--gray);
  margin: 0 0 1.8rem;
  max-width: 32em;
}

.page-about .mission-points {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.page-about .mission-point {
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
  background: var(--about-card-bg);
  border: 1px solid rgba(42, 195, 196, 0.15);
  border-radius: var(--radius-lg);
  padding: 1rem 1.1rem;
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .mission-point:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .point-icon {
  flex-shrink: 0;
  width: 2.2rem;
  height: 2.2rem;
  display: grid;
  place-items: center;
  border-radius: var(--radius-pill);
  background: rgba(42, 195, 196, 0.12);
  color: var(--cyan);
  font-size: 0.95rem;
  font-weight: 700;
}

.page-about .mission-point h3 {
  font-size: 0.95rem;
  margin: 0 0 0.2rem;
  color: var(--white);
}

.page-about .mission-point p {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--gray);
  margin: 0;
}

/* 品牌视觉 —— 熊猫图 */
.page-about .brand-visual {
  position: relative;
}

.page-about .panda-frame {
  position: relative;
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  padding: 0.5rem;
  border: 1px solid rgba(245, 179, 1, 0.35);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  transform: rotate(1.5deg);
  transition: transform var(--transition);
}

.page-about .panda-frame:hover {
  transform: rotate(0deg) translateY(-4px);
}

.page-about .panda-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: calc(var(--radius-lg) - 4px);
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.page-about .panda-badge {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(10, 14, 23, 0.85);
  border: 1px solid rgba(245, 179, 1, 0.4);
  color: var(--gold);
  font-size: 0.75rem;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-pill);
  letter-spacing: 0.08em;
}

.page-about .badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  display: inline-block;
  animation: about-pulse 2s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.5); }
  50% { opacity: 0.7; box-shadow: 0 0 0 5px rgba(16, 185, 129, 0); }
}

.page-about .decor-stripe {
  position: absolute;
  top: -0.8rem;
  right: -1.2rem;
  width: 4.5rem;
  height: 4.5rem;
  background: repeating-linear-gradient(
    -45deg,
    var(--red) 0 6px,
    transparent 6px 12px
  );
  border-radius: var(--radius-pill);
  opacity: 0.35;
  z-index: -1;
}

/* ========== 02 发展历程时间轴 ========== */
.page-about .timeline-section {
  background-color: rgba(27, 42, 65, 0.35);
  padding: 3rem 0;
  position: relative;
}

/* 斜线装饰带 */
.page-about .timeline-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--gold) 45%, var(--red) 100%);
  opacity: 0.5;
}

.page-about .timeline {
  position: relative;
  padding-left: 4.2rem;
  max-width: 880px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 1.35rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--cyan) 0%,
    var(--gold) 40%,
    var(--red) 75%,
    rgba(42, 195, 196, 0.2) 100%
  );
  opacity: 0.55;
}

.page-about .timeline-item {
  position: relative;
  margin-bottom: 2rem;
}

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

/* 时间轴节点 */
.page-about .timeline-marker {
  position: absolute;
  left: -4.2rem;
  top: 0.6rem;
  width: 2.7rem;
  text-align: center;
  color: var(--white);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.page-about .timeline-marker .version {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.7rem;
  height: 2.7rem;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px solid var(--cyan);
  color: var(--white);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  box-shadow: 0 0 0 4px rgba(10, 14, 23, 0.6);
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about .timeline-marker .year {
  font-size: 0.62rem;
  color: var(--gray);
  letter-spacing: 0.06em;
}

.page-about .timeline-marker.gold .version {
  border-color: var(--gold);
  background: rgba(245, 179, 1, 0.12);
  color: var(--gold);
}

.page-about .timeline-marker.red .version {
  border-color: var(--red);
  background: rgba(230, 57, 70, 0.12);
  color: var(--red);
}

.page-about .timeline-marker.current .version {
  background: var(--gold);
  color: var(--bg-deep);
  box-shadow: 0 0 18px rgba(245, 179, 1, 0.6);
}

.page-about .timeline-marker:hover .version {
  transform: scale(1.15);
}

/* 时间轴卡片 */
.page-about .timeline-card {
  background: var(--about-card-bg);
  border: 1px solid rgba(42, 195, 196, 0.14);
  border-left-width: 4px;
  border-left-color: var(--cyan);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.4rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.page-about .timeline-card:hover {
  transform: translateY(-3px);
  border-color: rgba(42, 195, 196, 0.4);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.page-about .timeline-card.current-card {
  border-left-color: var(--gold);
  background: linear-gradient(135deg, rgba(245, 179, 1, 0.08), var(--about-card-bg) 40%);
}

.page-about .timeline-card h3 {
  font-size: 1.08rem;
  margin: 0 0 0.5rem;
}

.page-about .timeline-card p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(248, 249, 250, 0.82);
  margin: 0 0 0.8rem;
}

.page-about .timeline-card p strong {
  color: var(--gold);
}

.page-about .timeline-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .timeline-meta span {
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  color: var(--gray);
  background: rgba(42, 195, 196, 0.08);
  border: 1px solid rgba(42, 195, 196, 0.14);
  border-radius: var(--radius-pill);
  padding: 0.22rem 0.7rem;
}

/* ========== 03 技术升级记录 ========== */
.page-about .tech-section {
  padding: 3rem 0;
  position: relative;
}

.page-about .tech-section::after {
  content: "";
  position: absolute;
  right: 0;
  top: 2.5rem;
  width: 30%;
  height: 8px;
  background: repeating-linear-gradient(
    -45deg,
    var(--wine) 0 8px,
    transparent 8px 16px
  );
  opacity: 0.28;
  border-radius: var(--radius-pill) 0 0 var(--radius-pill);
}

.page-about .tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: stretch;
}

.page-about .tech-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(42, 195, 196, 0.2);
  background: var(--bg-secondary);
}

.page-about .tech-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  min-height: 240px;
  object-fit: cover;
  object-position: center;
}

.page-about .tech-photo-caption {
  position: absolute;
  bottom: 0.85rem;
  left: 0.85rem;
  background: rgba(10, 14, 23, 0.82);
  border: 1px solid rgba(42, 195, 196, 0.3);
  color: var(--cyan);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-pill);
}

.page-about .tech-content .section-index {
  margin-bottom: 0.5rem;
}

.page-about .tech-content h2 {
  margin-bottom: 0.5rem;
}

.page-about .tech-content .section-sub {
  margin-bottom: 1.5rem;
}

.page-about .tech-item {
  background: var(--about-card-bg);
  border: 1px solid rgba(42, 195, 196, 0.12);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  margin-bottom: 1rem;
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .tech-item:hover {
  border-color: rgba(42, 195, 196, 0.45);
  transform: translateX(4px);
}

.page-about .tech-item-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.4rem;
}

.page-about .tech-tag {
  flex-shrink: 0;
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--cyan);
  background: rgba(42, 195, 196, 0.1);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.7rem;
  letter-spacing: 0.04em;
}

.page-about .tech-item h3 {
  font-size: 0.95rem;
  margin: 0;
}

.page-about .tech-item p {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--gray);
  margin: 0;
}

/* ========== 04 服务覆盖范围 ========== */
.page-about .coverage-section {
  position: relative;
  padding: 0;
  overflow: hidden;
}

.page-about .coverage-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .coverage-bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.page-about .coverage-scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(10, 14, 23, 0.85) 0%,
    rgba(10, 14, 23, 0.7) 45%,
    rgba(10, 14, 23, 0.92) 100%
  );
}

.page-about .coverage-content {
  position: relative;
  z-index: 2;
  padding: 3rem 0;
}

.page-about .coverage-content h2 {
  margin-bottom: 0.6rem;
}

.page-about .coverage-desc {
  color: rgba(248, 249, 250, 0.85);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0 0 1.8rem;
  max-width: 42em;
}

.page-about .coverage-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.8rem;
  max-width: 840px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.page-about .stat-block {
  background: rgba(10, 14, 23, 0.78);
  border: 1px solid rgba(248, 249, 250, 0.12);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1rem;
  text-align: center;
  scroll-snap-align: start;
  transition: transform var(--transition), border-color var(--transition);
  min-width: 140px;
}

.page-about .stat-block:hover {
  transform: translateY(-3px);
  border-color: var(--cyan);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--white);
  letter-spacing: -0.02em;
}

.page-about .stat-block.gold .stat-num { color: var(--gold); }
.page-about .stat-block.cyan .stat-num { color: var(--cyan); }
.page-about .stat-block.wine .stat-num { color: var(--wine); }
.page-about .stat-block.red .stat-num { color: var(--red); }
.page-about .stat-block.green .stat-num { color: var(--green); }

.page-about .stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--gray);
  margin-top: 0.4rem;
  letter-spacing: 0.08em;
}

/* ========== 05 未来方向 ========== */
.page-about .future-section {
  padding: 3rem 0;
  position: relative;
}

.page-about .future-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 2.4rem;
}

.page-about .future-card {
  position: relative;
  background: var(--about-card-bg);
  border: 1px solid rgba(42, 195, 196, 0.14);
  border-top-width: 4px;
  border-top-color: var(--cyan);
  border-radius: var(--radius-lg);
  padding: 1.3rem 1.4rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about .future-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.3);
}

.page-about .future-card.gold {
  border-top-color: var(--gold);
}

.page-about .future-card.cyan {
  border-top-color: var(--cyan);
}

.page-about .future-card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: var(--radius-pill);
  background: rgba(42, 195, 196, 0.12);
  color: var(--cyan);
  font-size: 0.78rem;
  font-weight: 800;
  margin-bottom: 0.8rem;
}

.page-about .future-card.gold .future-card-icon {
  background: rgba(245, 179, 1, 0.12);
  color: var(--gold);
}

.page-about .future-card.cyan .future-card-icon {
  background: rgba(42, 195, 196, 0.12);
  color: var(--cyan);
}

.page-about .future-card h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.page-about .future-card p {
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--gray);
  margin: 0;
}

/* 未来 CTA 区 */
.page-about .future-cta {
  background: rgba(27, 42, 65, 0.4);
  border: 1px solid rgba(42, 195, 196, 0.2);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
}

.page-about .cta-question {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
  margin: 0 0 1rem;
}

.page-about .cta-actions {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  align-items: center;
  justify-content: center;
}

.page-about .btn-gold {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--gold);
  color: var(--bg-deep);
  font-weight: 800;
  font-size: 0.86rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-pill);
  border: 2px solid var(--gold);
  text-align: center;
  text-decoration: none;
  transition: all var(--transition);
}

.page-about .btn-gold:hover {
  background: transparent;
  color: var(--gold);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 179, 1, 0.3);
}

.page-about .btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--cyan);
  font-weight: 700;
  font-size: 0.86rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-pill);
  border: 2px solid var(--cyan);
  text-align: center;
  text-decoration: none;
  transition: all var(--transition);
}

.page-about .btn-outline:hover {
  background: rgba(42, 195, 196, 0.12);
  transform: translateY(-2px);
}

.page-about .btn-text {
  display: inline-flex;
  align-items: center;
  color: var(--gray);
  font-size: 0.84rem;
  font-weight: 600;
  text-decoration: none;
  padding: 0.4rem 0.6rem;
  transition: color var(--transition);
}

.page-about .btn-text:hover {
  color: var(--white);
}

/* ====================================================
   对齐响应式定义
   ==================================================== */
/* 平板及以上的两栏适配 */
@media (min-width: 640px) {
  .page-about .mission-points {
    grid-template-columns: 1fr 1fr;
  }

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

  .page-about .coverage-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }

  .page-about .future-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.2rem;
  }

  .page-about .cta-actions {
    flex-direction: row;
    gap: 1rem;
  }
}

/* 常规桌面布局 */
@media (min-width: 1024px) {
  .page-about .brand-story {
    padding: 4.5rem 0 3.5rem;
  }

  .page-about .brand-story-inner {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 4rem;
  }

  .page-about .mission-points {
    grid-template-columns: 1fr;
    gap: 0.9rem;
  }

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

  /* 时间轴桌面适配 */
  .page-about .timeline {
    padding-left: 0;
    display: grid;
    grid-template-columns: 8rem 1fr;
    gap: 0 2.5rem;
    max-width: 960px;
  }

  .page-about .timeline::before {
    left: 4rem;
    top: 0.4rem;
    bottom: 0.4rem;
  }

  .page-about .timeline-item {
    display: contents;
  }

  .page-about .timeline-marker {
    position: relative;
    left: auto;
    top: 0.2rem;
    width: 8rem;
    justify-content: flex-start;
  }

  .page-about .timeline-card {
    grid-column: 2;
    margin-bottom: 1.4rem;
  }

  /* 技术区桌面适配 */
  .page-about .tech-grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 3rem;
    align-items: center;
  }

  .page-about .tech-visual {
    min-height: 320px;
  }

  /* 覆盖区桌面适配 */
  .page-about .coverage-content {
    padding: 4.5rem 0;
  }

  .page-about .coverage-stats {
    grid-template-columns: repeat(6, 1fr);
    gap: 1rem;
    overflow: visible;
  }

  .page-about .stat-block {
    min-width: auto;
    padding: 1.3rem 0.8rem;
  }

  .page-about .stat-num {
    font-size: 2.2rem;
  }

  /* 未来区桌面适配 */
  .page-about .future-section {
    padding: 4rem 0;
  }

  .page-about .future-cta {
    padding: 2rem 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    text-align: left;
  }

  .page-about .cta-question {
    margin: 0;
    flex-shrink: 0;
  }

  .page-about .cta-actions {
    flex-wrap: wrap;
    justify-content: flex-end;
  }
}

/* 超宽桌面微调 */
@media (min-width: 1400px) {
  .page-about .tech-grid {
    gap: 4rem;
  }

  .page-about .brand-story-inner {
    gap: 5rem;
  }
}

.page-about {
  --radius-sm: var(--radius-lg);
}