.page-about {
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(18px, 3vw, 30px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0;
  padding: 0;
  gap: 0;
  list-style: none;
  font-size: 13px;
  line-height: 1.6;
  color: var(--grey);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--line);
}

.page-about .breadcrumb-list a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .breadcrumb-list a:hover {
  color: var(--cyan-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(32px, 5.5vw, 68px) 0 clamp(32px, 5vw, 60px);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--step-h1);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero .lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 44em;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.85;
  color: var(--grey);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--stand);
  font-size: 13px;
  line-height: 1.6;
  color: var(--grey);
}

.page-about .about-stats .num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 26px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

/* ---------- 色带 ---------- */
.page-about .section-band {
  position: relative;
  overflow: hidden;
  height: 8px;
}

.page-about .section-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(234, 244, 240, 0.22) 0 2px,
    rgba(234, 244, 240, 0) 2px 12px
  );
  opacity: 0.5;
  pointer-events: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding-block: clamp(56px, 8vw, 96px);
}

.page-about .section-head {
  max-width: 52em;
}

.page-about .section-title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--step-h2);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .section-sub {
  margin: 14px 0 0;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--grey);
}

/* ---------- 版本时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin-top: clamp(28px, 4vw, 44px);
  padding-left: 26px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--cyan) 0%,
    var(--line) 16%,
    var(--line) 84%,
    rgba(30, 64, 56, 0) 100%
  );
}

.page-about .timeline-node {
  position: relative;
  background: var(--stand);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(16px, 2.6vw, 24px);
  transition: border-color 0.28s ease, transform 0.28s ease, box-shadow 0.28s ease;
}

.page-about .timeline-node + .timeline-node {
  margin-top: 16px;
}

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 30px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  box-shadow: var(--glow);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .timeline-node:hover,
.page-about .timeline-node.is-open {
  border-color: rgba(47, 243, 200, 0.55);
  box-shadow: var(--shadow);
}

.page-about .timeline-node:hover::before,
.page-about .timeline-node.is-open::before {
  background: var(--cyan);
  box-shadow: 0 0 18px rgba(47, 243, 200, 0.8);
}

.page-about .timeline-trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  column-gap: clamp(14px, 2.4vw, 24px);
  width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .timeline-trigger:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: 6px;
}

.page-about .timeline-ver {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

@supports (-webkit-text-stroke: 1px #ffffff) {
  .page-about .timeline-ver {
    color: transparent;
    -webkit-text-stroke: 1px var(--cyan);
  }

  .page-about .timeline-node:hover .timeline-ver,
  .page-about .timeline-node:focus-within .timeline-ver,
  .page-about .timeline-node.is-open .timeline-ver {
    color: var(--cyan);
    -webkit-text-stroke-color: transparent;
  }
}

.page-about .timeline-sum {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .timeline-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(17px, 2.1vw, 21px);
  line-height: 1.42;
  color: var(--paper);
}

.page-about .timeline-stage {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--grey);
}

.page-about .accordion__mark {
  position: relative;
  display: block;
  width: 18px;
  height: 18px;
  flex: none;
}

.page-about .accordion__mark::before,
.page-about .accordion__mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 0.28s ease, background-color 0.28s ease;
}

.page-about .accordion__mark::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1.5px;
  transform: translateY(-50%);
}

.page-about .accordion__mark::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1.5px;
  transform: translateX(-50%);
}

.page-about .timeline-node.is-open .accordion__mark::before {
  background: var(--orange);
}

.page-about .timeline-node.is-open .accordion__mark::after {
  transform: translateX(-50%) scaleY(0);
}

.page-about .timeline-panel {
  padding-top: clamp(14px, 2vw, 18px);
}

.page-about .timeline-panel[hidden] {
  display: none;
}

.page-about .timeline-panel::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: clamp(14px, 2vw, 18px);
  background: var(--line);
}

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

.page-about .timeline-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--grey);
}

.page-about .timeline-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 媒体框 ---------- */
.page-about .media-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--stand);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.82) brightness(0.9) contrast(1.05);
}

.page-about .media-caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--grey);
}

.page-about .about-team-media {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-proof-media {
  margin-top: clamp(24px, 3.4vw, 36px);
}

/* ---------- 团队四栏 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .team-card {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--stand);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.28s ease, transform 0.28s ease, box-shadow 0.28s ease;
}

.page-about .team-card:hover {
  border-color: rgba(47, 243, 200, 0.5);
  transform: translateY(-4px);
  box-shadow: inset 0 0 0 1px rgba(123, 255, 224, 0.08), var(--shadow);
}

.page-about .team-bar {
  display: block;
  width: 46px;
  height: 3px;
  margin-bottom: 16px;
  border-radius: 2px;
}

.page-about .team-card:nth-child(1) .team-bar {
  background: linear-gradient(90deg, var(--cyan), var(--cyan-soft));
}

.page-about .team-card:nth-child(2) .team-bar {
  background: linear-gradient(90deg, var(--cyan), var(--line));
}

.page-about .team-card:nth-child(3) .team-bar {
  background: linear-gradient(90deg, var(--cyan-soft), var(--line));
}

.page-about .team-card:nth-child(4) .team-bar {
  background: linear-gradient(90deg, var(--cyan), var(--grey));
}

.page-about .team-name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .team-count {
  margin: 8px 0 10px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .team-count .num {
  margin-right: 4px;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.04em;
}

.page-about .team-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey);
}

/* ---------- 校对流程 ---------- */
.page-about .proof-steps {
  display: grid;
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .proof-step {
  padding: clamp(20px, 3vw, 28px);
  background: var(--stand);
}

.page-about .proof-num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .proof-title {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .proof-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey);
}

.page-about .proof-note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 46em;
  padding-left: 18px;
  border-left: 2px solid var(--cyan);
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
}

/* ---------- 看球主张 ---------- */
.page-about .belief-layout {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .belief-list {
  display: grid;
  gap: 18px;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .belief-list li {
  position: relative;
  padding-left: 24px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .belief-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  box-shadow: var(--glow);
}

.page-about .belief-media {
  margin: 0;
}

/* ---------- 长期承诺 ---------- */
.page-about .promise-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .promise-card {
  padding: 26px 22px;
  background: linear-gradient(160deg, var(--stand) 0%, var(--ink) 82%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .promise-name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .promise-text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--grey);
}

/* ---------- 日常节奏 ---------- */
.page-about .rhythm-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .rhythm-col {
  padding: clamp(20px, 3vw, 28px);
  background: var(--stand);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .rhythm-col h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .rhythm-col h3::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: var(--glow);
}

.page-about .rhythm-col:last-child h3::before {
  background: var(--grey);
  box-shadow: none;
}

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

.page-about .rhythm-list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--grey);
}

.page-about .rhythm-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan-soft);
  opacity: 0.6;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(44px, 6vw, 84px);
}

.page-about .cta-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.4vw, 48px);
  background: linear-gradient(135deg, var(--stand) 0%, var(--ink) 72%);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
}

.page-about .cta-panel::before {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -130px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 243, 200, 0.16) 0%, rgba(47, 243, 200, 0) 68%);
  pointer-events: none;
}

.page-about .cta-title {
  position: relative;
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--step-h3);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .cta-text {
  position: relative;
  margin: 14px 0 0;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--grey);
}

.page-about .cta-text a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .cta-text a:hover {
  color: var(--cyan-soft);
}

.page-about .cta-actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .rhythm-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .timeline {
    padding-left: 56px;
  }

  .page-about .timeline::before {
    left: 16px;
  }

  .page-about .timeline-node::before {
    left: -45px;
    top: 40px;
  }

  .page-about .timeline-trigger {
    grid-template-columns: 130px minmax(0, 1fr) 28px;
  }

  .page-about .timeline-ver {
    font-size: 64px;
  }

  .page-about .belief-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline-node,
  .page-about .team-card,
  .page-about .accordion__mark::before,
  .page-about .accordion__mark::after {
    transition: none;
  }
}
<<<END>>>