.page-about {
  --ab-rail: 96px;
  --ab-line: rgba(41, 230, 214, 0.14);
  --ab-line-soft: rgba(126, 147, 166, 0.16);
  --ab-warm-line: rgba(255, 107, 74, 0.28);
  display: block;
  overflow-x: clip;
}

.page-about .about-crumbs {
  padding: calc(74px + 18px) 0 8px;
}

.page-about .about-crumbs .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--grey-400);
}

.page-about .about-crumbs .breadcrumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--grey-700);
}

.page-about .about-crumbs .breadcrumbs a {
  color: var(--grey-400);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-crumbs .breadcrumbs a:hover,
.page-about .about-crumbs .breadcrumbs a:focus-visible {
  color: var(--cyan);
}

.page-about .about-crumbs .breadcrumbs [aria-current="page"] {
  color: var(--white);
  font-family: var(--font-mono);
}

/* ---------- 开场 ---------- */
.page-about .about-open {
  position: relative;
  padding: 26px 0 clamp(48px, 8vw, 92px);
}

.page-about .about-open::before {
  content: "";
  position: absolute;
  inset: -120px -20% auto -20%;
  height: 460px;
  background:
    radial-gradient(52% 62% at 12% 32%, rgba(41, 230, 214, 0.18) 0%, rgba(41, 230, 214, 0) 68%),
    radial-gradient(46% 58% at 88% 12%, rgba(255, 107, 74, 0.16) 0%, rgba(255, 107, 74, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-open-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .about-open-copy h1 {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  font-size: clamp(2rem, 7.4vw, 3.5rem);
  color: var(--white);
}

.page-about .about-open-copy .lead {
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(244, 248, 251, 0.78);
}

.page-about .about-open-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
}

.page-about .about-open-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-panel {
  padding: 24px 22px 20px;
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(18, 50, 79, 0.92) 0%, rgba(11, 34, 56, 0.86) 100%);
  border: 1px solid var(--ab-line);
  box-shadow: var(--shadow-deep);
}

.page-about .about-panel-kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-panel-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-panel-list li {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: baseline;
  gap: 6px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--ab-line-soft);
}

.page-about .about-panel-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-panel-num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.9rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-panel-unit {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--coral);
}

.page-about .about-panel-label {
  grid-column: 1 / -1;
  font-size: 0.88rem;
  line-height: 1.6;
  color: rgba(244, 248, 251, 0.7);
}

.page-about .about-panel-foot {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ab-line-soft);
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--grey-400);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .about-chapter--deep {
  background: linear-gradient(180deg, var(--sea-900) 0%, var(--sea-800) 100%);
}

.page-about .about-chapter--mid {
  background: var(--sea-800);
  border-top: 1px solid var(--ab-line-soft);
  border-bottom: 1px solid var(--ab-line-soft);
}

.page-about .about-chapter--ink {
  background: linear-gradient(180deg, var(--ink) 0%, #071726 100%);
}

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

.page-about .about-num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(3.4rem, 15vw, 5.6rem);
  line-height: 0.82;
  letter-spacing: -0.05em;
  background: linear-gradient(165deg, var(--cyan) 0%, rgba(41, 230, 214, 0.35) 52%, rgba(255, 107, 74, 0.85) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: var(--cyan);
  -webkit-text-fill-color: transparent;
}

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

.page-about .about-body .section-title {
  margin: 10px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.2;
  font-size: clamp(1.42rem, 4.6vw, 2.1rem);
  color: var(--white);
}

.page-about .about-body > p {
  max-width: 66ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: rgba(244, 248, 251, 0.76);
}

.page-about .about-body > p + p {
  margin-top: 14px;
}

.page-about .about-body strong {
  color: var(--cyan);
  font-weight: 600;
}

.page-about .about-figure {
  margin: 30px 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--ab-line);
  background: var(--sea-700);
}

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

.page-about .about-figure .media-cap {
  display: block;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.02em;
  color: var(--grey-400);
  background: rgba(5, 7, 10, 0.5);
}

/* ---------- 01 赛前赛中赛后 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-flow-item {
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: rgba(18, 50, 79, 0.6);
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--cyan);
}

.page-about .about-flow-item:nth-child(2) {
  border-left-color: var(--signal);
}

.page-about .about-flow-item:nth-child(3) {
  border-left-color: var(--coral);
}

.page-about .about-flow-tag {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--white);
}

.page-about .about-flow-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(244, 248, 251, 0.74);
}

/* ---------- 02 覆盖指标 ---------- */
.page-about .about-metrics {
  display: grid;
  gap: 14px;
  margin-top: 26px;
  grid-template-columns: 1fr;
}

.page-about .about-metric {
  padding: 20px;
  border-radius: var(--r-md);
  background: rgba(6, 20, 36, 0.72);
  border: 1px solid var(--ab-line-soft);
}

.page-about .about-metric--wide {
  background: linear-gradient(140deg, rgba(41, 230, 214, 0.12) 0%, rgba(6, 20, 36, 0.7) 62%);
  border-color: var(--ab-line);
}

.page-about .about-metric--accent {
  background: linear-gradient(140deg, rgba(255, 107, 74, 0.14) 0%, rgba(6, 20, 36, 0.72) 64%);
  border-color: var(--ab-warm-line);
}

.page-about .about-metric-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(1.9rem, 8vw, 2.6rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-metric--accent .about-metric-num {
  color: var(--coral);
}

.page-about .about-metric-sym {
  font-size: 0.55em;
  margin-left: 2px;
}

.page-about .about-metric-label {
  display: block;
  margin-top: 8px;
  font-size: 0.86rem;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-metric p {
  margin: 10px 0 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--grey-400);
}

/* ---------- 03 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-top: 28px;
  padding-left: 22px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 5px;
  width: 2px;
  border-radius: var(--r-pill);
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(41, 230, 214, 0.22) 48%, var(--coral) 100%);
}

.page-about .about-node {
  position: relative;
  margin-bottom: 10px;
  border-radius: var(--r-md);
  background: rgba(11, 34, 56, 0.62);
  border: 1px solid var(--ab-line-soft);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--sea-900);
  border: 2px solid var(--cyan);
  transform: translateX(-3px);
}

.page-about .about-node[open] {
  background: rgba(18, 50, 79, 0.8);
  border-color: var(--ab-line);
}

.page-about .about-node[open]::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(41, 230, 214, 0.14);
}

.page-about .about-node-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  border-radius: var(--r-md);
}

.page-about .about-node-head::-webkit-details-marker {
  display: none;
}

.page-about .about-node-head:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-node-idx {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.86rem;
  color: var(--cyan);
}

.page-about .about-node-name {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-node-body {
  padding: 0 18px 18px 44px;
}

.page-about .about-node-body p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(244, 248, 251, 0.72);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 12px;
  margin-top: 26px;
  grid-template-columns: 1fr;
}

.page-about .about-team-item {
  padding: 18px;
  border-radius: var(--r-md);
  background: rgba(6, 20, 36, 0.68);
  border: 1px solid var(--ab-line-soft);
  border-top: 2px solid var(--cyan);
}

.page-about .about-team-item:nth-child(2) {
  border-top-color: var(--signal);
}

.page-about .about-team-item:nth-child(3) {
  border-top-color: var(--coral);
}

.page-about .about-team-item:nth-child(4) {
  border-top-color: var(--grey-400);
}

.page-about .about-team-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.7rem;
  line-height: 1;
  color: var(--white);
}

.page-about .about-team-role {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-team-item p {
  margin: 10px 0 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--grey-400);
}

.page-about .about-partner {
  margin-top: 20px;
  padding: 18px 20px;
  border-radius: var(--r-md);
  background: linear-gradient(120deg, rgba(255, 107, 74, 0.12) 0%, rgba(11, 34, 56, 0.2) 70%);
  border: 1px solid var(--ab-warm-line);
}

.page-about .about-partner-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--coral);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: rgba(244, 248, 251, 0.76);
}

/* ---------- 05 质量 ---------- */
.page-about .about-quality {
  display: grid;
  gap: 12px;
  margin-top: 26px;
  grid-template-columns: 1fr;
}

.page-about .about-quality-item {
  padding: 18px;
  border-radius: var(--r-md);
  background: rgba(18, 50, 79, 0.62);
  border: 1px solid var(--ab-line);
}

.page-about .about-quality-num {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 2.1rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-quality-label {
  display: block;
  margin-top: 8px;
  font-size: 0.86rem;
  color: rgba(244, 248, 251, 0.74);
}

.page-about .about-assure {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-assure li {
  position: relative;
  padding: 14px 16px 14px 20px;
  border-radius: var(--r-sm);
  background: rgba(5, 7, 10, 0.42);
  border-left: 2px solid var(--grey-700);
  font-size: 0.88rem;
  line-height: 1.75;
  color: rgba(244, 248, 251, 0.72);
}

.page-about .about-assure li strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--signal);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: clamp(52px, 9vw, 100px) 0 clamp(150px, 16vw, 190px);
  background:
    radial-gradient(70% 80% at 50% 0%, rgba(41, 230, 214, 0.12) 0%, rgba(41, 230, 214, 0) 66%),
    var(--sea-900);
}

.page-about .about-next-inner {
  text-align: left;
}

.page-about .about-next .section-title {
  margin: 10px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.2;
  font-size: clamp(1.5rem, 5vw, 2.2rem);
  color: var(--white);
}

.page-about .about-next .lead {
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: rgba(244, 248, 251, 0.76);
}

.page-about .about-next-grid {
  display: grid;
  gap: 12px;
  margin-top: 28px;
  grid-template-columns: 1fr;
}

.page-about .about-next-card {
  display: block;
  padding: 20px;
  border-radius: var(--r-md);
  background: rgba(18, 50, 79, 0.5);
  border: 1px solid var(--ab-line);
  text-decoration: none;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--cyan);
  background: rgba(18, 50, 79, 0.82);
}

.page-about .about-next-card--warm {
  border-color: var(--ab-warm-line);
}

.page-about .about-next-card--warm:hover,
.page-about .about-next-card--warm:focus-visible {
  border-color: var(--coral);
}

.page-about .about-next-key {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.82rem;
  color: var(--cyan);
}

.page-about .about-next-title {
  display: block;
  margin-top: 10px;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-next-desc {
  display: block;
  margin-top: 8px;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--grey-400);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-metrics,
  .page-about .about-team,
  .page-about .about-quality,
  .page-about .about-next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-metric--wide {
    grid-column: span 2;
  }
}

@media (min-width: 900px) {
  .page-about .about-crumbs {
    padding-top: calc(74px + 28px);
  }

  .page-about .about-open-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, 1fr);
    gap: 48px;
  }

  .page-about .about-chapter-grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-num {
    position: sticky;
    top: 116px;
    font-size: clamp(4rem, 6vw, 5.6rem);
  }

  .page-about .about-figure {
    margin-top: 38px;
  }

  .page-about .about-quality {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-open-copy h1 {
    font-size: 3.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next-card {
    transition: none;
  }

  .page-about .about-next-card:hover,
  .page-about .about-next-card:focus-visible {
    transform: none;
  }
}
<<<END>>>