.page-about {
  background: var(--deep-navy);
  overflow-x: hidden;
  position: relative;
}

/* ===== 首屏 ===== */
.page-about-hero {
  position: relative;
  padding: 44px 0 56px;
  border-bottom: 1px solid rgba(200, 255, 0, 0.15);
}

.page-about-hero::before {
  content: "";
  position: absolute;
  right: -140px;
  top: -120px;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.22) 0%, transparent 65%);
  pointer-events: none;
}

.page-about-hero::after {
  content: "";
  position: absolute;
  left: -80px;
  bottom: -60px;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(200, 255, 0, 0.12) 0%, transparent 65%);
  pointer-events: none;
}

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

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

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

.page-about-hero-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--electric-blue);
  border: 1px solid rgba(0, 229, 255, 0.35);
  background: rgba(0, 229, 255, 0.06);
  padding: 6px 12px;
  margin-bottom: 18px;
}

.page-about-hero h1 {
  margin: 0 0 10px;
  font-size: 38px;
  line-height: 1.12;
  font-weight: 900;
  color: var(--white);
  letter-spacing: -0.02em;
}

.page-about-hero-lead {
  font-size: 18px;
  color: var(--fluo-green);
  font-weight: 700;
  margin: 0 0 14px;
}

.page-about-hero-desc {
  color: var(--muted-slate);
  font-size: 14px;
  line-height: 1.85;
  margin: 0;
  font-weight: 300;
}

.page-about-hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.page-about-metric {
  position: relative;
  padding: 18px 12px;
  background: linear-gradient(160deg, rgba(0, 45, 54, 0.7), rgba(5, 10, 21, 0.9));
  border: 1px solid rgba(200, 255, 0, 0.2);
  text-align: center;
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.page-about-metric::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--fluo-green);
}

.page-about-metric:nth-child(2)::before {
  background: var(--electric-blue);
}

.page-about-metric:nth-child(3)::before {
  background: var(--purple);
}

.page-about-metric:hover {
  transform: translateY(-3px);
}

.page-about-metric-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  color: var(--fluo-green);
  line-height: 1.1;
}

.page-about-metric:nth-child(2) .page-about-metric-num {
  color: var(--electric-blue);
}

.page-about-metric:nth-child(3) .page-about-metric-num {
  color: var(--purple);
}

.page-about-metric-label {
  font-size: 12px;
  color: var(--muted-slate);
  margin-top: 6px;
  display: block;
  font-weight: 300;
}

/* ===== 发展历程 ===== */
.page-about-timeline {
  position: relative;
  padding: 64px 0 72px;
  overflow: hidden;
}

.page-about-timeline-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.24;
  pointer-events: none;
}

.page-about-timeline-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.3) brightness(0.55) contrast(1.1);
}

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

.page-about-timeline-intro {
  color: var(--muted-slate);
  font-size: 14px;
  line-height: 1.7;
  font-weight: 300;
  margin: 12px 0 0;
}

.page-about-tl {
  position: relative;
  padding-top: 32px;
}

.page-about-tl::before {
  content: "";
  position: absolute;
  left: 88px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  transform: translateX(-1px);
  background: linear-gradient(to bottom, var(--fluo-green) 0%, var(--electric-blue) 55%, var(--purple) 100%);
}

.page-about-tl-item {
  display: flex;
  align-items: flex-start;
  position: relative;
  margin-bottom: 30px;
}

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

.page-about-tl-year {
  flex: 0 0 88px;
  text-align: right;
  padding-right: 20px;
  position: relative;
}

.page-about-tl-year span {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--fluo-green);
  background: rgba(200, 255, 0, 0.08);
  border: 1px solid rgba(200, 255, 0, 0.25);
  padding: 4px 8px;
  border-radius: 2px;
}

.page-about-tl-year::after {
  content: "";
  position: absolute;
  right: -6px;
  top: 50%;
  width: 12px;
  height: 12px;
  margin-top: -6px;
  background: var(--fluo-green);
  border-radius: 50%;
  border: 3px solid var(--deep-navy);
  z-index: 1;
}

.page-about-tl-item:nth-child(even) .page-about-tl-year span {
  color: var(--electric-blue);
  border-color: rgba(0, 229, 255, 0.3);
  background: rgba(0, 229, 255, 0.08);
}

.page-about-tl-item:nth-child(even) .page-about-tl-year::after {
  background: var(--electric-blue);
}

.page-about-tl-item:nth-child(3n) .page-about-tl-year span {
  color: var(--purple);
  border-color: rgba(179, 136, 255, 0.3);
  background: rgba(179, 136, 255, 0.08);
}

.page-about-tl-item:nth-child(3n) .page-about-tl-year::after {
  background: var(--purple);
}

.page-about-tl-card {
  flex: 1;
  margin-left: 24px;
  padding: 18px;
  background: linear-gradient(135deg, rgba(0, 45, 54, 0.5), rgba(5, 10, 21, 0.85));
  border: 1px solid rgba(200, 255, 0, 0.18);
  border-left: 4px solid var(--fluo-green);
  border-radius: var(--radius);
  position: relative;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about-tl-card::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 8px;
  background: repeating-linear-gradient(to bottom, var(--electric-blue) 0 2px, transparent 2px 6px);
  opacity: 0.35;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about-tl-item:nth-child(even) .page-about-tl-card {
  border-left-color: var(--electric-blue);
}

.page-about-tl-item:nth-child(3n) .page-about-tl-card {
  border-left-color: var(--purple);
}

.page-about-tl-item:hover .page-about-tl-card {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.55);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.page-about-tl-card-head {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.page-about-tl-phase {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted-slate);
}

.page-about-tl-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--white);
  font-weight: 900;
  letter-spacing: 0.01em;
}

.page-about-tl-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted-slate);
  font-weight: 300;
}

.page-about-tl-link {
  margin-top: 12px !important;
}

.page-about-tl-link a {
  color: var(--electric-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.4);
  padding-bottom: 2px;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about-tl-link a:hover {
  color: var(--fluo-green);
  border-color: var(--fluo-green);
}

/* ===== 数据能力 ===== */
.page-about-capability {
  padding: 64px 0 72px;
  position: relative;
}

.page-about-capability::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, rgba(0, 229, 255, 0.4), rgba(200, 255, 0, 0.4), transparent);
}

.page-about-cap-grid {
  display: grid;
  gap: 24px;
}

.page-about-cap-figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid rgba(0, 229, 255, 0.2);
}

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

.page-about-cap-figcap {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 6px 12px;
  font-size: 12px;
  color: var(--white);
  background: rgba(5, 10, 21, 0.82);
  border-left: 3px solid var(--fluo-green);
  backdrop-filter: blur(4px);
}

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

.page-about-cap-stat {
  padding: 16px 12px;
  background: linear-gradient(160deg, rgba(0, 45, 54, 0.5), rgba(5, 10, 21, 0.85));
  border: 1px solid rgba(122, 139, 168, 0.25);
  border-radius: var(--radius);
  text-align: center;
}

.page-about-cap-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--electric-blue);
  line-height: 1.15;
}

.page-about-cap-stat:nth-child(3n-2) .page-about-cap-stat-num {
  color: var(--fluo-green);
}

.page-about-cap-stat-label {
  font-size: 12px;
  color: var(--muted-slate);
  display: block;
  margin-top: 4px;
  font-weight: 300;
}

.page-about-cap-panels {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-about-cap-panel {
  background: rgba(5, 10, 21, 0.7);
  border: 1px solid rgba(122, 139, 168, 0.3);
  border-radius: var(--radius);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about-cap-panel[open] {
  border-color: var(--fluo-green);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
}

.page-about-cap-panel summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 16px;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.page-about-cap-panel summary::-webkit-details-marker {
  display: none;
}

.page-about-cap-panel-icon {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--electric-blue);
  border: 1px solid rgba(0, 229, 255, 0.3);
  padding: 4px 8px;
  border-radius: 2px;
  flex: 0 0 auto;
}

.page-about-cap-panel[open] .page-about-cap-panel-icon {
  color: var(--fluo-green);
  border-color: var(--fluo-green);
}

.page-about-cap-panel-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about-cap-panel-marker {
  margin-left: auto;
  width: 20px;
  height: 20px;
  position: relative;
  flex: 0 0 auto;
}

.page-about-cap-panel-marker::before,
.page-about-cap-panel-marker::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--muted-slate);
  transition: background 0.3s ease;
}

.page-about-cap-panel-marker::before {
  width: 2px;
  height: 12px;
  transform: translate(-50%, -50%);
}

.page-about-cap-panel-marker::after {
  width: 12px;
  height: 2px;
  transform: translate(-50%, -50%);
}

.page-about-cap-panel[open] .page-about-cap-panel-marker::before {
  display: none;
}

.page-about-cap-panel[open] .page-about-cap-panel-marker::after {
  background: var(--fluo-green);
}

.page-about-cap-panel-body {
  padding: 0 16px 18px;
}

.page-about-cap-panel-body p {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid rgba(122, 139, 168, 0.2);
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted-slate);
  font-weight: 300;
}

/* ===== 订阅服务范围 ===== */
.page-about-coverage {
  padding: 64px 0 72px;
  position: relative;
  background: linear-gradient(180deg, transparent, rgba(0, 45, 54, 0.3), transparent);
}

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

.page-about-league-card {
  background: linear-gradient(135deg, rgba(0, 45, 54, 0.4), rgba(5, 10, 21, 0.85));
  border: 1px solid rgba(122, 139, 168, 0.25);
  border-radius: var(--radius);
  padding: 22px 20px;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about-league-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 4px;
  background: var(--fluo-green);
  opacity: 0.75;
}

.page-about-league-card:nth-child(2n)::before {
  background: var(--electric-blue);
}

.page-about-league-card:nth-child(3n)::before {
  background: var(--purple);
}

.page-about-league-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.55);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.32);
}

.page-about-league-code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted-slate);
  display: block;
  margin-bottom: 10px;
}

.page-about-league-card h3 {
  font-size: 20px;
  color: var(--white);
  margin: 0 0 8px;
  font-weight: 900;
}

.page-about-league-card p {
  font-size: 13px;
  color: var(--muted-slate);
  line-height: 1.7;
  margin: 0 0 16px;
  font-weight: 300;
}

.page-about-coverage-note {
  margin: 28px 0 0;
  padding: 16px 18px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--muted-slate);
  background: rgba(0, 229, 255, 0.05);
  border-left: 3px solid var(--electric-blue);
  font-weight: 300;
}

.page-about-coverage-note a {
  color: var(--electric-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.4);
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about-coverage-note a:hover {
  color: var(--fluo-green);
  border-color: var(--fluo-green);
}

/* ===== 合作生态与荣誉 ===== */
.page-about-ecosystem {
  padding: 64px 0 56px;
}

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

.page-about-eco-map {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(200, 255, 0, 0.18);
}

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

.page-about-eco-node {
  position: absolute;
  padding: 7px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--white);
  background: rgba(10, 17, 40, 0.92);
  border: 1px solid var(--fluo-green);
  border-radius: 2px;
  box-shadow: 0 0 18px rgba(200, 255, 0, 0.12);
  white-space: nowrap;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about-eco-node:hover {
  transform: scale(1.06);
  box-shadow: 0 0 24px rgba(200, 255, 0, 0.25);
}

.node-a {
  top: 16%;
  left: 14%;
}

.node-b {
  top: 26%;
  right: 14%;
  border-color: var(--electric-blue);
}

.node-c {
  bottom: 18%;
  left: 20%;
}

.node-d {
  bottom: 24%;
  right: 20%;
  border-color: var(--electric-blue);
}

.page-about-eco-side {
  display: flex;
  flex-direction: column;
}

.page-about-eco-title {
  margin: 0 0 18px;
  font-size: 22px;
  font-weight: 900;
  color: var(--white);
}

.page-about-honor-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about-honor {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(122, 139, 168, 0.2);
  transition: background 0.3s ease, padding 0.3s ease;
}

.page-about-honor:last-child {
  border-bottom: none;
}

.page-about-honor:hover {
  background: rgba(0, 229, 255, 0.04);
  padding-left: 8px;
}

.page-about-honor-level {
  flex: 0 0 auto;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--muted-slate);
  border: 1px solid rgba(122, 139, 168, 0.35);
  padding: 3px 6px;
  border-radius: 2px;
  margin-top: 2px;
}

.page-about-honor-svg {
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  color: var(--fluo-green);
  transition: color 0.3s ease, transform 0.3s ease;
}

.page-about-honor:nth-child(2) .page-about-honor-svg {
  color: var(--electric-blue);
}

.page-about-honor:nth-child(3) .page-about-honor-svg {
  color: var(--purple);
}

.page-about-honor:hover .page-about-honor-svg {
  transform: scale(1.08);
  filter: drop-shadow(0 0 8px rgba(200, 255, 0, 0.35));
}

.page-about-honor h4 {
  margin: 0 0 6px;
  font-size: 15px;
  color: var(--white);
  font-weight: 700;
}

.page-about-honor p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted-slate);
  font-weight: 300;
}

.page-about-eco-note {
  margin: 20px 0 0;
  font-size: 13px;
  color: var(--muted-slate);
  font-weight: 300;
}

.page-about-eco-note a {
  color: var(--electric-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.4);
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about-eco-note a:hover {
  color: var(--fluo-green);
  border-color: var(--fluo-green);
}

/* ===== 相关页面入口 ===== */
.page-about-links {
  padding: 16px 0 64px;
}

.page-about-links-grid {
  display: grid;
  gap: 12px;
}

.page-about-link-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  background: linear-gradient(135deg, rgba(0, 45, 54, 0.45), rgba(5, 10, 21, 0.8));
  border: 1px solid rgba(122, 139, 168, 0.22);
  border-radius: var(--radius);
  text-decoration: none;
  transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.page-about-link-item:hover {
  transform: translateX(6px);
  border-color: rgba(0, 229, 255, 0.5);
  background: linear-gradient(135deg, rgba(0, 45, 54, 0.65), rgba(5, 10, 21, 0.85));
  text-decoration: none;
}

.page-about-link-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--white);
}

.page-about-link-arrow {
  font-family: var(--font-mono);
  color: var(--electric-blue);
  font-size: 16px;
  transition: transform 0.3s ease, color 0.3s ease;
}

.page-about-link-item:hover .page-about-link-arrow {
  transform: translateX(4px);
  color: var(--fluo-green);
}

/* ===== 桌面端增强 ===== */
@media (min-width: 640px) {
  .page-about-hero {
    padding: 56px 0 64px;
  }

  .page-about-hero-grid {
    grid-template-columns: 1.5fr 1fr;
    align-items: end;
    gap: 40px;
  }

  .page-about-hero h1 {
    font-size: 48px;
  }

  .page-about-hero-lead {
    font-size: 20px;
  }

  .page-about-hero-desc {
    font-size: 15px;
  }

  .page-about-hero-metrics {
    gap: 12px;
  }

  .page-about-metric {
    padding: 20px 14px;
  }

  .page-about-metric-num {
    font-size: 32px;
  }

  .page-about-tl {
    padding-left: 20px;
  }

  .page-about-tl::before {
    left: 120px;
  }

  .page-about-tl-year {
    flex: 0 0 120px;
    padding-right: 28px;
  }

  .page-about-tl-year span {
    font-size: 16px;
    padding: 4px 10px;
  }

  .page-about-tl-year::after {
    right: -8px;
    width: 14px;
    height: 14px;
    margin-top: -7px;
  }

  .page-about-tl-card {
    margin-left: 32px;
    padding: 22px 24px;
  }

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

@media (min-width: 900px) {
  .page-about-hero-grid {
    grid-template-columns: 1fr 480px;
    align-items: end;
  }

  .page-about-hero h1 {
    font-size: 58px;
  }

  .page-about-cap-panels {
    grid-template-columns: repeat(3, 1fr);
    margin-top: 32px;
  }

  .page-about-cap-grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: stretch;
  }

  .page-about-coverage-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about-eco-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: start;
  }

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

  .page-about-link-item {
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 10px;
    padding: 20px;
  }

  .page-about-link-item:hover {
    transform: translateY(-4px);
  }

  .page-about-link-arrow {
    align-self: flex-end;
  }
}