.page-about {
  --about-ink: rgba(242, 246, 252, 0.04);
  --about-accent-dim: rgba(255, 93, 44, 0.08);
  background: var(--bg);
  color: var(--text);
  position: relative;
  overflow: hidden;
}

.page-about .breadcrumbs {
  padding-top: 132px;
  padding-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--muted);
  position: relative;
  z-index: 2;
}

.page-about .breadcrumbs a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.3s ease;
}

.page-about .breadcrumbs a:hover {
  opacity: 0.75;
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--muted);
  cursor: default;
}

.page-about .breadcrumbs__sep {
  color: var(--border);
}

/* ========== 英雄区 ========== */
.page-about .about-hero {
  position: relative;
  padding: 60px 0 88px;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-hero__content {
  max-width: 680px;
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1.15;
  color: var(--text);
  margin: 16px 0 24px;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 32px;
  max-width: 620px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero__aside {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  text-align: right;
  padding: 8px 0;
}

.page-about .about-hero__code {
  font-family: var(--font-accent);
  font-size: 14px;
  letter-spacing: 0.22em;
  color: var(--border);
  line-height: 1.6;
  writing-mode: vertical-rl;
}

.page-about .about-hero__code--right {
  color: rgba(255, 93, 44, 0.55);
}

.page-about .about-hero__grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.5;
  pointer-events: none;
  z-index: 1;
}

.page-about .about-hero__grid-index {
  position: absolute;
  right: 28px;
  bottom: 24px;
  font-family: var(--font-accent);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--border);
  z-index: 2;
  pointer-events: none;
}

/* ========== 章节标题通用 ========== */
.page-about .about-section-head {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 16px;
}

.page-about .about-section-head .section-number {
  font-family: var(--font-accent);
  font-weight: 700;
  font-size: clamp(40px, 7vw, 64px);
  line-height: 0.9;
  color: rgba(255, 93, 44, 0.28);
  flex-shrink: 0;
  letter-spacing: -0.02em;
  margin-top: 4px;
}

.page-about .section-overline {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 8px;
}

.page-about h2 {
  font-family: var(--font-heading);
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.2;
  color: var(--text);
  margin: 0;
  letter-spacing: -0.01em;
}

.page-about .section-lead {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 680px;
  margin: 0 0 36px;
}

.page-about .section {
  padding-top: 72px;
  padding-bottom: 72px;
  border-bottom: 1px solid var(--border);
  position: relative;
}

/* ========== 01 品牌起源 ========== */
.page-about .about-origin {
  padding-top: 96px;
  padding-bottom: 96px;
  position: relative;
  overflow: hidden;
}

.page-about .about-origin__ghost {
  position: absolute;
  top: -28px;
  right: -8px;
  font-family: var(--font-accent);
  font-weight: 700;
  font-size: clamp(160px, 28vw, 260px);
  line-height: 1;
  color: var(--about-accent-dim);
  z-index: 0;
  pointer-events: none;
  letter-spacing: -0.04em;
}

.page-about .about-origin__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  position: relative;
  z-index: 2;
}

.page-about .about-origin__text h2 {
  margin-bottom: 16px;
}

.page-about .about-origin__points {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .about-origin__point {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.page-about .about-origin__point-num {
  font-family: var(--font-accent);
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 11px;
  flex-shrink: 0;
  line-height: 1;
  margin-top: 2px;
}

.page-about .about-origin__point h3 {
  font-family: var(--font-heading);
  font-size: 18px;
  color: var(--text);
  margin: 0 0 6px;
}

.page-about .about-origin__point p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.page-about .about-origin__media {
  border: 1px solid var(--border);
  background: var(--bg-card);
}

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

/* ========== 02 发展里程碑 ========== */
.page-about .about-milestones {
  padding-top: 96px;
  padding-bottom: 96px;
  background: var(--bg);
  overflow: hidden;
}

.page-about .about-milestones__media-wrap {
  margin-bottom: 56px;
}

.page-about .about-milestones__media {
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.page-about .about-milestones__media img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* 时间轴 */
.page-about .about-timeline {
  position: relative;
  padding-left: 32px;
  max-width: 960px;
}

.page-about .about-timeline__rail {
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, rgba(255, 93, 44, 0.65) 0%, rgba(27, 41, 68, 0.5) 60%, rgba(57, 255, 136, 0.35) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 44px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -32px;
  top: 6px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  box-shadow: 0 0 14px rgba(255, 93, 44, 0.55);
  z-index: 2;
}

.page-about .about-timeline__meta {
  margin-bottom: 12px;
}

.page-about .about-timeline__tag {
  font-family: var(--font-accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--success);
  display: inline-block;
  padding: 2px 9px;
  border: 1px solid rgba(57, 255, 136, 0.3);
  background: rgba(57, 255, 136, 0.06);
  margin-bottom: 8px;
}

.page-about .about-timeline__meta h3 {
  font-family: var(--font-heading);
  font-size: 19px;
  line-height: 1.3;
  color: var(--text);
  margin: 0;
}

.page-about .about-timeline__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 20px 22px;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .about-timeline__card p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

/* ========== 03 体育芯片库 ========== */
.page-about .about-data {
  padding-top: 96px;
  padding-bottom: 96px;
}

.page-about .about-data__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.page-about .about-data__hero-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 32px 32px 32px 40px;
  position: relative;
  overflow: hidden;
}

.page-about .about-data__hero-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 6px;
  height: 100%;
  background: var(--accent);
}

.page-about .about-data__hero-card::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, rgba(255, 93, 44, 0.16) 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-data__label {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 12px;
}

.page-about .about-data__number {
  font-family: var(--font-accent);
  font-size: clamp(52px, 9vw, 76px);
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.page-about .about-data__number sup {
  font-size: 26px;
  vertical-align: super;
  margin-left: 2px;
}

.page-about .about-data__hero-card p:last-child {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
  max-width: 420px;
}

.page-about .about-data__metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.page-about .about-data__metric {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 20px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  justify-content: center;
}

.page-about .about-data__metric-num {
  font-family: var(--font-accent);
  font-size: clamp(22px, 4vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--success);
  letter-spacing: -0.01em;
}

.page-about .about-data__metric-num sup {
  font-size: 14px;
  vertical-align: super;
}

.page-about .about-data__metric-label {
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--muted);
  line-height: 1.4;
}

.page-about .about-data__detail-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 20px;
}

.page-about .about-data__detail {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 24px;
}

.page-about .about-data__detail h3 {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 14px;
}

.page-about .about-data__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-data__list li {
  font-family: var(--font-accent);
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  padding: 4px 14px;
  border: 1px solid var(--border);
  background: var(--bg);
  letter-spacing: 0.03em;
}

.page-about .about-data__steps {
  margin: 0;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-data__steps li {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}

.page-about .about-data__steps li::marker {
  color: var(--accent);
  font-family: var(--font-accent);
  font-weight: 700;
}

.page-about .about-data__detail-note {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  margin: 12px 0 0;
}

.page-about .about-data__detail p:last-child {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

/* ========== 04 团队与协作生态 ========== */
.page-about .about-team {
  padding-top: 96px;
  padding-bottom: 96px;
  position: relative;
  overflow: hidden;
  border-bottom: 0;
}

.page-about .about-team::before {
  content: "TEAM";
  position: absolute;
  left: -24px;
  bottom: -20px;
  font-family: var(--font-accent);
  font-weight: 700;
  font-size: clamp(140px, 24vw, 220px);
  letter-spacing: -0.04em;
  color: var(--about-ink);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-team__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  position: relative;
  z-index: 2;
}

.page-about .about-team__centers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 32px;
}

.page-about .about-team__center {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 24px 24px 24px 68px;
  position: relative;
  transition: border-color 0.3s ease;
}

.page-about .about-team__center:hover {
  border-color: rgba(255, 93, 44, 0.45);
}

.page-about .about-team__center-num {
  position: absolute;
  left: 20px;
  top: 24px;
  font-family: var(--font-accent);
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.45;
}

.page-about .about-team__center h3 {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 8px;
}

.page-about .about-team__center p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.page-about .about-team__side {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-team__media {
  border: 1px solid var(--border);
  background: var(--bg-card);
}

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

.page-about .about-team__coop {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 24px;
  position: relative;
  overflow: hidden;
}

.page-about .about-team__coop::after {
  content: "";
  position: absolute;
  right: -30px;
  top: -30px;
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(57, 255, 136, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-team__coop h3 {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 12px;
}

.page-about .about-team__coop p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0 0 10px;
}

.page-about .about-team__coop p:last-child {
  margin-bottom: 0;
}

/* ========== CTA 区块 ========== */
.page-about .about-cta {
  padding-top: 48px;
  padding-bottom: 72px;
  border-bottom: 0;
}

.page-about .about-cta__inner {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 52px 28px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-about .about-cta__inner::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 42%, rgba(255, 93, 44, 0.09) 50%, transparent 58%);
  pointer-events: none;
}

.page-about .about-cta .section-overline {
  position: relative;
  z-index: 2;
}

.page-about .about-cta h2 {
  font-size: clamp(24px, 4vw, 36px);
  margin: 0 0 28px;
  position: relative;
  z-index: 2;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  position: relative;
  z-index: 2;
}

/* ========== 媒体角标 ========== */
.page-about .media__label {
  display: inline-block;
  font-family: var(--font-accent);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  background: var(--bg);
  border-left: 2px solid var(--accent);
  padding: 6px 12px;
  margin-top: -1px;
}

/* ========== 平板窄屏 ========== */
@media (min-width: 640px) {
  .page-about .about-section-head {
    gap: 28px;
  }

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

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

  .page-about .about-team__center {
    padding-left: 20px;
    padding-top: 56px;
  }

  .page-about .about-team__center-num {
    top: 16px;
    left: 20px;
  }
}

/* ========== 桌面端 ========== */
@media (min-width: 900px) {
  .page-about .breadcrumbs {
    padding-top: 148px;
  }

  .page-about .about-hero {
    padding: 80px 0 120px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: 1fr 180px;
  }

  .page-about .about-hero__aside {
    display: flex;
  }

  .page-about .about-hero__code {
    writing-mode: horizontal-tb;
  }

  .page-about .about-origin {
    padding-top: 120px;
    padding-bottom: 120px;
  }

  .page-about .about-origin__layout {
    grid-template-columns: 1fr 0.92fr;
    gap: 64px;
  }

  .page-about .about-origin__ghost {
    right: 4px;
    top: -36px;
  }

  .page-about .about-milestones {
    padding-top: 120px;
    padding-bottom: 120px;
  }

  .page-about .about-timeline {
    padding-left: 44px;
  }

  .page-about .about-timeline__rail {
    left: 12px;
  }

  .page-about .about-timeline__dot {
    left: -44px;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 36px;
  }

  .page-about .about-timeline__meta {
    margin-bottom: 0;
    text-align: right;
    padding-top: 2px;
  }

  .page-about .about-timeline__card {
    padding: 24px 28px;
  }

  .page-about .about-data {
    padding-top: 120px;
    padding-bottom: 120px;
  }

  .page-about .about-data__grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
  }

  .page-about .about-data__metrics {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .page-about .about-data__metric {
    padding: 24px 28px;
    flex-direction: row;
    align-items: center;
    gap: 16px;
    justify-content: flex-start;
  }

  .page-about .about-data__metric-num {
    font-size: 30px;
    min-width: 96px;
  }

  .page-about .about-data__metric-label {
    font-size: 14px;
  }

  .page-about .about-team {
    padding-top: 120px;
    padding-bottom: 120px;
  }

  .page-about .about-team__layout {
    grid-template-columns: 1fr 0.88fr;
    gap: 56px;
  }

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

  .page-about .about-team__center {
    padding-left: 68px;
  }

  .page-about .about-team__center-num {
    left: 20px;
    top: 24px;
  }

  .page-about .about-team__side {
    gap: 20px;
  }

  .page-about .about-cta {
    padding-top: 64px;
    padding-bottom: 96px;
  }

  .page-about .about-cta__inner {
    padding: 64px 48px;
  }
}