/* ========= 必一体育 · 品牌概况（.page-about） ========= */

.page-about {
  --pa-deep-3: #092b52;
  --pa-neon-soft: rgba(0, 229, 160, 0.13);
  --pa-orange-soft: rgba(255, 107, 53, 0.13);
  position: relative;
  font-family: var(--font-body);
  background: var(--c-deep);
  color: var(--c-ink);
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---- 首屏品牌区与面包屑 ---- */

.page-about__intro {
  position: relative;
  padding: clamp(108px, 14vw, 150px) 0 64px;
  color: #f5f7fa;
  background:
    repeating-radial-gradient(circle at 22% 82%, rgba(0, 229, 160, 0.07) 0 1px, transparent 1px 22px),
    radial-gradient(ellipse 70% 48% at 82% 18%, rgba(255, 107, 53, 0.14), transparent 56%),
    linear-gradient(140deg, var(--c-deep) 0%, var(--c-deep-2) 56%, var(--c-deep) 100%);
  overflow: hidden;
}

.page-about__intro::before {
  content: "";
  position: absolute;
  top: -12%;
  right: -6%;
  width: 54%;
  height: 130%;
  background: linear-gradient(168deg, var(--pa-neon-soft), rgba(255, 107, 53, 0.08));
  clip-path: polygon(34% 0, 100% 0, 78% 100%, 0% 100%);
  pointer-events: none;
}

.page-about .breadcrumb {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 0 0 28px;
  font-size: 14px;
  color: rgba(245, 247, 250, 0.66);
}

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

.page-about .breadcrumb__sep {
  color: rgba(245, 247, 250, 0.5);
}

.page-about__intro-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}

.page-about__intro-copy {
  max-width: 680px;
}

.page-about__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-neon);
}

.page-about__eyebrow::before {
  content: "";
  width: 30px;
  height: 3px;
  border-radius: 99px;
  background: var(--c-orange);
}

.page-about .page-title {
  margin: 0 0 20px;
  max-width: 720px;
  font-family: var(--font-head);
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.16;
  color: #ffffff;
}

.page-about .page-subtitle {
  margin: 0 0 30px;
  max-width: 640px;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(245, 247, 250, 0.84);
}

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

.page-about__intro-actions .btn-outline {
  border-color: rgba(245, 247, 250, 0.4);
  color: #ffffff;
}

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

.page-about__intro-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 24px;
  box-shadow: 0 26px 60px rgba(2, 8, 24, 0.42);
}

.page-about__intro-figure::before {
  content: "";
  position: absolute;
  top: 14px;
  right: -14px;
  bottom: -14px;
  left: 14px;
  z-index: -1;
  border-radius: 24px;
  background: linear-gradient(135deg, var(--c-neon), var(--c-orange));
  opacity: 0.24;
}

.page-about__intro-figure figcaption {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(245, 247, 250, 0.56);
}

/* ---- 页内章节导航 ---- */

.page-about__section-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 24px;
  padding: 14px 20px;
  background: rgba(10, 30, 63, 0.62);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.page-about__section-nav a {
  color: rgba(245, 247, 250, 0.72);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  padding: 4px 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about__section-nav a:hover,
.page-about__section-nav a.is-active {
  color: var(--c-neon);
  border-bottom-color: var(--c-neon);
}

/* ---- 品牌故事 ---- */

.page-about__story {
  position: relative;
  padding-top: 76px;
  padding-bottom: 84px;
  background: linear-gradient(180deg, var(--c-mist) 0%, #ffffff 100%);
}

.page-about__story::before {
  content: "01";
  position: absolute;
  top: 60px;
  right: 3%;
  font-family: var(--font-data);
  font-size: 130px;
  font-weight: 800;
  line-height: 1;
  color: rgba(10, 30, 63, 0.055);
  pointer-events: none;
  z-index: 0;
}

.page-about__story .section-head,
.page-about__story-copy {
  position: relative;
  z-index: 1;
}

.page-about__story .section-kicker {
  color: var(--c-orange);
}

.page-about__story .section-title {
  color: var(--c-deep);
}

.page-about__pullquote {
  margin: 28px 0 24px;
  max-width: 780px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.22;
  font-weight: 700;
  color: var(--c-deep);
  border-left: 6px solid var(--c-neon);
  padding-left: 24px;
}

.page-about__story-copy {
  margin: 0 0 18px;
  max-width: 760px;
  font-size: 16px;
  line-height: 1.9;
  color: #3d4350;
}

/* ---- 发展历程时间轴 ---- */

.page-about__milestones {
  position: relative;
  padding-top: 88px;
  padding-bottom: 88px;
  background:
    radial-gradient(circle at 84% 12%, rgba(0, 229, 160, 0.12), transparent 30%),
    radial-gradient(circle at 10% 90%, var(--pa-orange-soft), transparent 28%),
    linear-gradient(160deg, var(--c-deep) 0%, var(--c-deep-2) 58%, var(--pa-deep-3) 100%);
}

.page-about__milestones .section-kicker {
  color: var(--c-neon);
}

.page-about__milestones .section-title {
  color: #ffffff;
}

.page-about__milestones .section-desc {
  color: rgba(245, 247, 250, 0.72);
}

.page-about__timeline {
  position: relative;
  list-style: none;
  margin: 48px 0 0;
  padding: 0;
  max-width: 840px;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: 99px;
  background: linear-gradient(180deg, var(--c-neon) 0%, var(--c-orange) 100%);
  opacity: 0.45;
}

.page-about__timeline-item {
  position: relative;
  margin: 0 0 36px;
  padding-left: 52px;
}

.page-about__timeline-dot {
  position: absolute;
  left: 8px;
  top: 18px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--c-neon);
  box-shadow: 0 0 0 6px rgba(0, 229, 160, 0.18);
}

.page-about__timeline-item--now .page-about__timeline-dot {
  background: var(--c-orange);
  box-shadow: 0 0 0 6px rgba(255, 107, 53, 0.18);
  animation: page-about-pulse 2.4s ease-in-out infinite;
}

@keyframes page-about-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.25); }
}

.page-about__timeline-card {
  padding: 22px 24px;
  border-radius: 18px;
  background: rgba(10, 30, 63, 0.52);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-left: 4px solid var(--c-neon);
  box-shadow: 0 16px 36px rgba(2, 10, 28, 0.25);
}

.page-about__timeline-item--now .page-about__timeline-card {
  border-left-color: var(--c-orange);
}

.page-about__timeline-year {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  background: var(--c-neon);
  color: var(--c-deep);
}

.page-about__timeline-item--now .page-about__timeline-year {
  background: var(--c-orange);
  color: #ffffff;
}

.page-about__timeline-card .card-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  color: #ffffff;
}

.page-about__timeline-card .card-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 247, 250, 0.76);
}

/* ---- 数据覆盖 ---- */

.page-about__coverage {
  position: relative;
  padding-top: 88px;
  padding-bottom: 88px;
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.024) 0 2px, transparent 2px 14px),
    linear-gradient(180deg, var(--c-deep) 0%, var(--c-deep-2) 100%);
}

.page-about__coverage .section-kicker {
  color: var(--c-neon);
}

.page-about__coverage .section-title {
  color: #ffffff;
}

.page-about__coverage .section-desc {
  color: rgba(245, 247, 250, 0.74);
}

.page-about__coverage-grid {
  margin-top: 40px;
  padding: clamp(20px, 4vw, 44px);
  border-radius: 28px;
  background: var(--c-mist);
  box-shadow: 0 30px 70px rgba(2, 10, 28, 0.35);
}

.page-about__stat-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about__stat {
  position: relative;
  padding: 22px 20px;
  border-radius: 18px;
  background: #ffffff;
  border: 1px solid var(--c-line);
  box-shadow: 0 8px 24px rgba(10, 30, 63, 0.06);
}

.page-about__stat::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 44px;
  height: 4px;
  border-radius: 0 4px 0 0;
  background: var(--c-neon);
}

.page-about .stat-value {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-data);
  font-size: clamp(30px, 3vw, 38px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-deep);
}

.page-about__stat:nth-child(4) .stat-value {
  color: var(--c-orange);
}

.page-about__stat-label {
  display: block;
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-gray);
}

.page-about__coverage-chart-grid {
  display: grid;
  gap: 24px;
  align-items: center;
}

.page-about__chart-wrap {
  min-width: 0;
}

.page-about__chart-title {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  color: var(--c-deep);
}

.page-about__chart-item {
  display: grid;
  grid-template-columns: 118px 1fr auto;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about__chart-label {
  font-size: 14px;
  color: var(--c-gray);
}

.page-about__chart-track {
  display: block;
  height: 12px;
  border-radius: 99px;
  background: var(--c-line);
  overflow: hidden;
}

.page-about__chart-fill {
  display: block;
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--c-neon), var(--c-deep-2));
  transform-origin: left center;
  animation: page-about-sweep 1.2s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.page-about__chart-item:nth-child(2) .page-about__chart-fill {
  background: linear-gradient(90deg, var(--c-orange), var(--c-deep-2));
}

@keyframes page-about-sweep {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.page-about__chart-value {
  font-family: var(--font-data);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-deep);
  white-space: nowrap;
}

.page-about__coverage-figure {
  margin: 0;
}

.page-about__coverage-figure img {
  width: 100%;
  aspect-ratio: 3 / 1;
  object-fit: cover;
  border-radius: 18px;
}

.page-about__coverage-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-gray);
}

/* ---- 技术优势 ---- */

.page-about__tech {
  padding-top: 88px;
  padding-bottom: 88px;
  background:
    radial-gradient(circle at 88% 10%, rgba(0, 229, 160, 0.14), transparent 30%),
    linear-gradient(180deg, #ffffff 0%, var(--c-mist) 100%);
}

.page-about__tech .section-kicker {
  color: var(--c-orange);
}

.page-about__tech .section-title {
  color: var(--c-deep);
}

.page-about__tech-grid {
  display: grid;
  gap: 28px;
}

.page-about__tech-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about__tech-item {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 16px;
  align-items: start;
  padding: 22px;
  border-radius: var(--radius);
  background: #ffffff;
  border: 1px solid var(--c-line);
  box-shadow: 0 10px 30px rgba(10, 30, 63, 0.07);
}

.page-about__tech-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  color: var(--c-deep);
  background: linear-gradient(135deg, var(--c-neon), rgba(0, 229, 160, 0.45));
}

.page-about__tech-item:nth-child(2) .page-about__tech-icon {
  background: linear-gradient(135deg, var(--c-orange), rgba(255, 107, 53, 0.5));
  color: #ffffff;
}

.page-about__tech-body {
  min-width: 0;
}

.page-about__tech-body h3 {
  margin: 2px 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  color: var(--c-deep);
}

.page-about__tech-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-gray);
}

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

.page-about__tech-visual img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 24px;
  box-shadow: 0 20px 48px rgba(10, 30, 63, 0.18);
}

/* ---- 信任声明区 ---- */

.page-about__trust {
  position: relative;
  padding-top: 80px;
  padding-bottom: 80px;
  text-align: center;
  background: linear-gradient(145deg, var(--c-deep) 0%, var(--c-deep-2) 70%, var(--pa-deep-3) 100%);
}

.page-about__trust::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-radial-gradient(circle at 50% 120%, rgba(0, 229, 160, 0.06) 0 1px, transparent 1px 26px);
  pointer-events: none;
}

.page-about__trust-eyebrow {
  position: relative;
  z-index: 1;
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-neon);
}

.page-about__trust-title {
  position: relative;
  z-index: 1;
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  color: #ffffff;
}

.page-about__trust-text {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto 28px;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 247, 250, 0.8);
}

.page-about__trust-links {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

.page-about__trust-links .btn-outline {
  border-color: rgba(245, 247, 250, 0.5);
  color: #ffffff;
}

.page-about__trust-links .btn-outline:hover {
  border-color: var(--c-orange);
  color: var(--c-orange);
}

/* ---- 响应式：平板与桌面 ---- */

@media (min-width: 640px) {
  .page-about__stat-strip {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about__intro {
    padding-bottom: 80px;
  }

  .page-about__intro-grid {
    grid-template-columns: 1.06fr 0.94fr;
    gap: 64px;
    align-items: center;
  }

  .page-about__section-nav {
    gap: 12px 32px;
    padding: 16px 28px;
  }

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

  .page-about__coverage-chart-grid {
    grid-template-columns: 1.12fr 0.88fr;
    gap: 32px;
  }

  .page-about__tech-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 48px;
    align-items: center;
  }

  .page-about__chart-item {
    grid-template-columns: 140px 1fr auto;
    gap: 16px;
  }
}