.page-about {
  font-family: var(--font-body);
  color: var(--text-primary);
  background: var(--surface);
  overflow-x: clip;
}

/* ===== 通用容器 ===== */
.page-about .about-hero-inner,
.page-about .about-manifesto-grid,
.page-about .about-milestones-wrap,
.page-about .about-data-grid,
.page-about .about-team-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ===== 章节头 ===== */
.page-about .about-section-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .about-section-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-green);
  color: var(--primary-bg);
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 0.8125rem;
  line-height: 1;
  padding: 7px 12px 7px 10px;
  clip-path: polygon(0 0, 100% 0, 90% 100%, 0 100%);
}

.page-about .about-section-sub {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  text-transform: uppercase;
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  background: var(--primary-bg);
  color: #fff;
  padding: 36px 0 68px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 32px), 0 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -12%;
  top: -28%;
  width: 58%;
  height: 170%;
  background: rgba(198, 255, 0, 0.07);
  transform: rotate(14deg);
  border-radius: 24px;
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumb {
  margin-bottom: 28px;
}

.page-about .about-hero-eyebrow {
  margin-bottom: 12px;
  color: var(--accent-green);
}

.page-about .about-hero-main h1 {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 2.125rem;
  line-height: 1.24;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  color: #fff;
  max-width: 14em;
}

.page-about .about-hero-lead {
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.74);
  margin: 0 0 22px;
  max-width: 38em;
}

.page-about .about-hero-slogan {
  display: inline-flex;
  background: var(--accent-green);
  color: var(--primary-bg);
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 0.8125rem;
  line-height: 1;
  padding: 10px 16px 10px 14px;
  clip-path: polygon(0 0, 100% 0, 92% 100%, 0 100%);
  margin-bottom: 30px;
}

.page-about .about-hero-meta {
  position: absolute;
  right: 18px;
  top: 20px;
}

.page-about .about-hero-meta .text-vertical {
  color: rgba(255, 255, 255, 0.42);
  font-size: 0.75rem;
  letter-spacing: 0.24em;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.page-about .about-hero-stat {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px 12px;
}

.page-about .about-hero-stat-num {
  display: block;
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.375rem;
  line-height: 1.1;
  color: var(--accent-green);
}

.page-about .about-hero-stat-num span {
  font-size: 0.875rem;
}

.page-about .about-hero-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.58);
}

/* ===== 品牌初衷 ===== */
.page-about .about-manifesto {
  background: var(--secondary-bg);
  padding: 64px 0;
}

.page-about .about-manifesto-grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-manifesto-copy h2 {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.625rem;
  line-height: 1.35;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}

.page-about .about-manifesto-copy p {
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 18px;
  max-width: 40em;
}

.page-about .about-manifesto-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-image-card {
  background: var(--surface);
  padding: 12px;
  box-shadow: var(--shadow-subtle);
  margin: 0;
}

.page-about .about-image-card img {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .about-image-caption {
  display: block;
  padding: 12px 4px 4px;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  background: var(--surface);
  padding: 64px 0 72px;
}

.page-about .about-milestones-body {
  display: grid;
  gap: 40px;
}

.page-about .about-milestones-intro h2 {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.625rem;
  line-height: 1.35;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}

.page-about .about-milestones-intro p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin: 0;
  max-width: 34em;
}

.page-about .about-milestones-media {
  margin-top: 44px;
}

.page-about .about-milestones-media img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== 时间线 ===== */
.page-about .about-timeline {
  position: relative;
  padding-left: 28px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-green) 0%, var(--border) 100%);
}

.page-about .about-timeline-item {
  position: relative;
  margin-bottom: 28px;
}

.page-about .about-timeline-dot {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  background: var(--accent-green);
  border: 3px solid var(--surface);
  box-shadow: 0 0 0 2px var(--accent-green);
  border-radius: 50%;
}

.page-about .about-timeline-phase {
  display: inline-block;
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--accent-orange);
  margin-bottom: 8px;
}

.page-about .about-timeline-card {
  background: var(--secondary-bg);
  padding: 18px 20px;
  border-left: 3px solid var(--accent-green);
  box-shadow: 0 1px 0 rgba(10, 26, 47, 0.04);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.page-about .about-timeline-item:hover .about-timeline-card {
  transform: translateX(4px);
  box-shadow: var(--shadow-subtle);
}

.page-about .about-timeline-card h3 {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.0625rem;
  margin: 0 0 8px;
}

.page-about .about-timeline-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.page-about .about-timeline-more {
  margin-left: 0;
}

/* ===== 数据来源与审核 ===== */
.page-about .about-data {
  position: relative;
  background: var(--primary-bg);
  color: #fff;
  padding: 64px 0 76px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 36px), 0 100%);
  overflow: hidden;
}

.page-about .about-data-grid {
  display: grid;
  gap: 36px;
}

.page-about .about-data-copy h2 {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.625rem;
  line-height: 1.35;
  margin: 0 0 16px;
  color: #fff;
  letter-spacing: -0.01em;
}

.page-about .about-data-copy p {
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.85;
  margin: 0;
  max-width: 40em;
}

.page-about .about-data-points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-data-points li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.82);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 14px 16px;
}

.page-about .about-data-points span {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 0.75rem;
  line-height: 1;
  color: var(--primary-bg);
  background: var(--accent-green);
  padding: 6px 8px;
  white-space: nowrap;
}

.page-about .about-data-link {
  display: inline-block;
  margin-top: 24px;
  color: var(--accent-green);
  border-bottom: 2px solid var(--accent-green);
  padding-bottom: 2px;
  font-weight: 700;
  font-size: 0.9375rem;
  text-decoration: none;
  transition: opacity 0.2s var(--ease-out);
}

.page-about .about-data-link:hover {
  opacity: 0.78;
}

.page-about .about-image-card--dark {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: none;
}

.page-about .about-image-card--dark .about-image-caption {
  color: rgba(255, 255, 255, 0.58);
}

/* ===== 图表面板 ===== */
.page-about .about-chart-panel {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 24px 16px 20px;
}

.page-about .about-chart-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .about-chart-head h3 {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.0625rem;
  margin: 0;
  color: #fff;
}

.page-about .about-chart-head span {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
}

.page-about .about-chart {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 600 / 240;
}

.page-about .about-chart-grid {
  stroke: rgba(255, 255, 255, 0.12);
  stroke-width: 1.5;
}

.page-about .about-chart-line {
  fill: none;
  stroke: var(--accent-green);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 800;
  stroke-dashoffset: 0;
}

.page-about .about-chart-dot {
  fill: var(--accent-green);
  stroke: var(--primary-bg);
  stroke-width: 2;
}

.page-about .about-chart-dot--last {
  fill: var(--accent-orange);
  stroke: var(--accent-orange);
}

.page-about .about-chart[data-reveal="true"] .about-chart-line {
  stroke-dashoffset: 800;
  animation: about-chart-draw 1.4s var(--ease-out) 0.2s forwards;
}

@keyframes about-chart-draw {
  to {
    stroke-dashoffset: 0;
  }
}

/* ===== 团队构成 ===== */
.page-about .about-team {
  position: relative;
  background: var(--secondary-bg);
  padding: 64px 0 72px;
  overflow: hidden;
}

.page-about .about-team::before {
  content: "九州体育";
  position: absolute;
  right: -28px;
  top: 24px;
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 7.5rem;
  line-height: 1;
  color: rgba(26, 37, 51, 0.045);
  white-space: nowrap;
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-team-head h2 {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.625rem;
  line-height: 1.35;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}

.page-about .about-team-head p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin: 0;
  max-width: 40em;
}

.page-about .about-team-grid {
  display: grid;
  gap: 16px;
  margin-top: 36px;
}

.page-about .about-team-card {
  background: var(--surface);
  padding: 24px 22px;
  border-top: 3px solid var(--accent-green);
  box-shadow: var(--shadow-subtle);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.page-about .about-team-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 28px rgba(10, 26, 47, 0.1);
}

.page-about .about-team-card-tag {
  display: inline-block;
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--accent-orange);
  background: rgba(255, 107, 53, 0.08);
  padding: 5px 10px;
  margin-bottom: 14px;
}

.page-about .about-team-card h3 {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.125rem;
  margin: 0 0 10px;
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* ===== data-reveal 渐进增强 ===== */
.page-about .about-timeline-item[data-reveal="true"] {
  animation: about-timeline-in 0.55s var(--ease-out) both;
}

@keyframes about-timeline-in {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ===== 平板及以上 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 48px 0 84px;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 44px), 0 100%);
  }

  .page-about .about-hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 160px;
    gap: 36px;
    align-items: start;
  }

  .page-about .about-hero-main {
    grid-column: 1;
  }

  .page-about .about-hero-meta {
    grid-column: 2;
    position: static;
    align-self: center;
  }

  .page-about .about-hero-stats {
    grid-column: 1 / -1;
    display: flex;
    gap: 16px;
    margin-top: 4px;
  }

  .page-about .about-hero-stat {
    flex: 1;
    max-width: 200px;
  }

  .page-about .about-manifesto-grid {
    grid-template-columns: 1.3fr 1fr;
    gap: 48px;
  }

  .page-about .about-manifesto-visual .about-image-card {
    max-width: 420px;
    margin-left: auto;
  }

  .page-about .about-milestones-body {
    grid-template-columns: 0.9fr 1.4fr;
    gap: 48px;
  }

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

  .page-about .about-chart-panel {
    grid-column: 1 / -1;
    margin-top: 8px;
  }

  .page-about .about-team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

/* ===== 桌面端 ===== */
@media (min-width: 1024px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1fr) 200px;
  }

  .page-about .about-hero-main h1 {
    font-size: 3.25rem;
    line-height: 1.16;
    max-width: 12em;
  }

  .page-about .about-hero-lead {
    font-size: 1.0625rem;
    max-width: 30em;
  }

  .page-about .about-manifesto,
  .page-about .about-milestones,
  .page-about .about-data,
  .page-about .about-team {
    padding-top: 80px;
    padding-bottom: 88px;
  }

  .page-about .about-manifesto-copy h2,
  .page-about .about-milestones-intro h2,
  .page-about .about-data-copy h2,
  .page-about .about-team-head h2 {
    font-size: 2rem;
    line-height: 1.3;
  }

  .page-about .about-timeline {
    padding-left: 32px;
  }

  .page-about .about-timeline::before {
    left: 9px;
  }

  .page-about .about-timeline-dot {
    left: -32px;
  }

  .page-about .about-team-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .page-about .about-team::before {
    font-size: 11rem;
    right: -32px;
    top: 32px;
  }
}