.page-about {
  position: relative;
  color: var(--text-primary);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: 24px;
}

.page-about .section-number {
  display: block;
  font-family: var(--font-mono);
  font-size: 3.25rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(0, 229, 255, 0.16);
  -webkit-text-stroke: 1px rgba(0, 229, 255, 0.42);
  margin-bottom: 14px;
}

/* ============ 01 页头区 ============ */
.about-hero {
  position: relative;
  padding: 48px 0 64px;
}

.about-hero::before {
  content: "";
  position: absolute;
  inset: -80px -60px auto auto;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.1), transparent 62%);
  pointer-events: none;
}

.about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-color) 30%, var(--accent-cyan) 65%, transparent);
}

.about-hero__grid {
  display: grid;
  gap: 44px;
}

.about-hero__intro {
  position: relative;
  z-index: 1;
}

.about-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin: 0 0 10px;
}

.about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  font-weight: 700;
  font-style: italic;
  line-height: 1.06;
  letter-spacing: -0.02em;
  transform: skewX(-5deg);
  transform-origin: left center;
  margin: 0 0 8px;
}

.about-hero__lead {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin: 0 0 18px;
}

.about-hero__desc {
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--text-secondary);
  max-width: 54ch;
  margin: 0 0 22px;
}

.about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ============ Bento 统计区 ============ */
.about-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.about-stat-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 104px;
  padding: 18px 16px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.about-stat-card:hover {
  border-color: rgba(0, 229, 255, 0.65);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.32);
}

.about-stat-card::before {
  content: "";
  position: absolute;
  right: -20px;
  top: -20px;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.22), transparent 68%);
  opacity: 0.8;
}

.about-stat-card--users::before {
  background: radial-gradient(circle, rgba(57, 255, 20, 0.2), transparent 68%);
}

.about-stat-card--dau::before {
  background: radial-gradient(circle, rgba(255, 106, 0, 0.2), transparent 68%);
}

.about-stat-card--users,
.about-stat-card--daily {
  grid-column: span 2;
}

.about-stat-num {
  font-family: var(--font-mono);
  font-size: 2.1rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.about-stat-card--users .about-stat-num {
  color: var(--accent-green);
}

.about-stat-card--daily .about-stat-num {
  color: var(--accent-cyan);
}

.about-stat-card--dau .about-stat-num {
  color: var(--accent-orange);
}

.about-stat-label {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 10px;
  letter-spacing: 0.02em;
}

/* ============ 通用 Section 头 ============ */
.about-section-head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 34px;
}

.about-section-head .section-number {
  flex-shrink: 0;
  margin-bottom: 0;
  padding-top: 4px;
}

.about-section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  transform: skewX(-3deg);
  transform-origin: left center;
  margin: 0 0 8px;
}

.about-section-head p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ============ 02 发展里程碑 ============ */
.about-milestones {
  position: relative;
  padding: 64px 0 76px;
  background:
    repeating-linear-gradient(94deg, transparent 0px, transparent 5px, rgba(255, 106, 0, 0.025) 5px, transparent 6px),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-card) 100%);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.about-milestones__layout {
  display: grid;
  gap: 34px;
}

.about-visual {
  margin: 0;
}

.about-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.about-visual figcaption {
  padding: 10px 4px 0;
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.about-timeline {
  position: relative;
  display: grid;
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.about-timeline::before {
  content: "";
  position: absolute;
  top: 16px;
  bottom: 16px;
  left: 12px;
  width: 1.5px;
  background: linear-gradient(180deg, var(--accent-cyan) 0%, var(--border-color) 55%, rgba(0, 229, 255, 0.15) 100%);
}

.about-timeline__item {
  position: relative;
  padding-left: 38px;
}

.about-timeline__item::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--accent-cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.12);
}

.about-timeline details {
  background: rgba(17, 23, 38, 0.72);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.about-timeline details[open] {
  border-color: rgba(0, 229, 255, 0.5);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.26);
}

.about-timeline summary {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 15px 16px;
  cursor: pointer;
  user-select: none;
}

.about-timeline summary::-webkit-details-marker {
  display: none;
}

.about-timeline__badge {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.28);
  border-radius: 6px;
  padding: 5px 8px;
  white-space: nowrap;
}

.about-timeline__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-right: auto;
}

.about-timeline__marker {
  position: relative;
  flex-shrink: 0;
  width: 18px;
  height: 18px;
}

.about-timeline__marker::before,
.about-timeline__marker::after {
  content: "";
  position: absolute;
  top: 8px;
  left: 3px;
  width: 12px;
  height: 2px;
  background: var(--text-secondary);
  transition: background var(--transition), transform var(--transition);
}

.about-timeline__marker::after {
  width: 2px;
  height: 12px;
  top: 3px;
  left: 8px;
}

.about-timeline details[open] .about-timeline__marker::before,
.about-timeline details[open] .about-timeline__marker::after {
  background: var(--accent-cyan);
}

.about-timeline details[open] .about-timeline__marker::after {
  transform: rotate(90deg);
}

.about-timeline__body {
  padding: 14px 16px 16px;
  border-top: 1px solid rgba(42, 58, 92, 0.42);
}

.about-timeline__body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* ============ 03 团队与技术 ============ */
.about-team {
  padding: 72px 0;
}

.about-team__layout {
  display: grid;
  gap: 34px;
  align-items: start;
}

.about-team__intro h3 {
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
}

.about-team__intro p {
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin: 0 0 26px;
}

.about-team__roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.about-role-card {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 14px;
  row-gap: 6px;
  padding: 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}

.about-role-card:hover {
  border-color: rgba(0, 229, 255, 0.55);
  transform: translateY(-2px);
}

.about-role-card__num {
  grid-row: 1 / 3;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent-cyan);
  letter-spacing: -0.03em;
  padding-top: 2px;
}

.about-role-card h4 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0;
}

.about-role-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

.about-visual--team img {
  aspect-ratio: 3 / 2;
}

/* ============ 04 数据源与合规 ============ */
.about-data {
  padding: 72px 0;
  background:
    radial-gradient(ellipse at 82% 16%, rgba(0, 229, 255, 0.06), transparent 46%),
    var(--bg-card);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.about-data__grid {
  display: grid;
  gap: 18px;
}

.about-visual--server img {
  aspect-ratio: 4 / 3;
}

.about-data__source,
.about-data__compliance {
  background: var(--bg-deep);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
}

.about-data h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  margin: 0 0 12px;
}

.about-data p {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin: 0;
}

.about-data ul {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.about-data ul li {
  position: relative;
  padding-left: 16px;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.about-data ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-green);
}

.about-data__cert-list {
  margin-top: 0;
}

.about-data__cert-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px;
  background: rgba(17, 23, 38, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  margin-bottom: 10px;
}

.about-data__cert-list li:last-child {
  margin-bottom: 0;
}

.about-data__cert-list li::before {
  display: none;
}

.about-data__icon {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent-cyan);
  background: rgba(0, 229, 255, 0.07);
  border: 1px solid rgba(0, 229, 255, 0.32);
  border-radius: 12px;
}

.about-data__cert-list strong {
  display: block;
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.about-data__cert-list p {
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin: 0;
}

/* ============ 05 品牌愿景 ============ */
.about-vision {
  position: relative;
  padding: 96px 0;
  overflow: hidden;
}

.about-vision::before {
  content: "GAME ON";
  position: absolute;
  z-index: 0;
  top: 20px;
  left: -30px;
  font-family: var(--font-display);
  font-size: clamp(5rem, 12vw, 10rem);
  font-weight: 700;
  font-style: italic;
  line-height: 1;
  white-space: nowrap;
  color: transparent;
  -webkit-text-stroke: 1px rgba(0, 229, 255, 0.09);
  transform: rotate(-4deg);
  pointer-events: none;
}

.about-vision .container {
  position: relative;
  z-index: 1;
}

.about-vision .section-number {
  margin-bottom: 8px;
}

.about-vision__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin: 0 0 8px;
}

.about-vision h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  font-weight: 700;
  transform: skewX(-3deg);
  transform-origin: left center;
  margin: 0 0 12px;
}

.about-vision__slogan {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 700;
  font-style: italic;
  line-height: 1.12;
  letter-spacing: -0.02em;
  transform: skewX(-5deg);
  transform-origin: left center;
  color: var(--text-primary);
  max-width: 18ch;
  margin: 0 0 16px;
}

.about-vision__slogan::after {
  content: "";
  display: block;
  width: 88px;
  height: 4px;
  margin-top: 20px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-green));
  border-radius: 2px;
}

.about-vision__desc {
  max-width: 44ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--text-secondary);
  margin: 0 0 32px;
}

.about-vision__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 响应式增强 ============ */
@media (min-width: 640px) {
  .about-hero h1 {
    font-size: clamp(2.6rem, 5vw, 3.6rem);
  }

  .about-team__roles {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-data__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-data__source,
  .about-data__compliance {
    grid-column: span 1;
  }
}

@media (min-width: 768px) {
  .about-hero {
    padding: 64px 0 76px;
  }

  .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
    align-items: center;
    gap: 52px;
  }

  .about-stats-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .about-stat-card--season {
    grid-column: span 2;
  }

  .about-stat-card--league {
    grid-column: span 1;
  }

  .about-stat-card--users {
    grid-column: span 3;
  }

  .about-stat-card--daily {
    grid-column: span 3;
  }

  .about-stat-card--team {
    grid-column: span 1;
  }

  .about-stat-card--dau {
    grid-column: span 2;
  }

  .about-stat-num {
    font-size: 2.3rem;
  }
}

@media (min-width: 960px) {
  .about-milestones {
    padding: 76px 0 88px;
  }

  .about-milestones__layout {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
    gap: 44px;
    align-items: start;
  }

  .about-visual--river {
    position: sticky;
    top: 28px;
  }

  .about-team {
    padding: 84px 0;
  }

  .about-team__layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 48px;
    align-items: start;
  }

  .about-visual--team {
    position: sticky;
    top: 28px;
  }

  .about-data {
    padding: 84px 0;
  }

  .about-data__grid {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: auto auto;
    align-items: stretch;
  }

  .about-visual--server {
    grid-column: span 2;
    grid-row: span 2;
    margin: 0;
  }

  .about-visual--server img {
    height: 100%;
    min-height: 100%;
    aspect-ratio: auto;
  }

  .about-data__source {
    grid-column: span 2;
    display: flex;
    flex-direction: column;
  }

  .about-data__compliance {
    grid-column: span 2;
    grid-row: 2;
  }

  .about-vision {
    padding: 120px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stat-card,
  .page-about .about-role-card,
  .page-about .about-timeline details {
    transition: none;
  }
}