/* ===== 品牌文化页 · 赛道时间轴 ===== */
.page-about {
  --about-rail-w: 46px;
  --about-tint: rgba(53, 224, 200, 0.08);
  display: block;
}

.page-about .shell {
  padding-inline: var(--gutter);
}

.page-about .breadcrumbs {
  padding-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--grey);
}

.page-about .breadcrumbs a {
  color: var(--line);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--step-fast), color var(--step-fast);
}

.page-about .breadcrumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .section {
  padding-block: clamp(44px, 7vw, 88px);
  border-top: var(--frame);
  position: relative;
}

.page-about .about-hero {
  border-top: 0;
  padding-block: clamp(28px, 5vw, 56px) clamp(44px, 7vw, 88px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

.page-about .about-hero h1.display-1 {
  margin: 14px 0 0;
  font-size: clamp(36px, 7.6vw, 86px);
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 34em;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-hero__stats .metric {
  padding: 12px 14px;
  background: var(--panel);
  border: var(--hairline);
}

.page-about .about-hero__stats .metric__value {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.1;
  letter-spacing: 0.02em;
  display: block;
}

.page-about .about-hero__stats .metric__label {
  font-size: 12px;
  color: var(--grey);
  letter-spacing: 0.06em;
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
  }

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

/* --- 三条内容线 --- */
.page-about .about-pillars {
  margin-top: clamp(26px, 4vw, 46px);
  display: grid;
  gap: 0;
  border-top: var(--hairline);
}

.page-about .about-pillar {
  display: grid;
  gap: 8px;
  padding: clamp(20px, 3vw, 32px) 0 clamp(20px, 3vw, 32px) 18px;
  border-bottom: var(--hairline);
  border-left: 6px solid var(--line);
}

.page-about .about-pillar:nth-child(1) { border-left-color: var(--cyan); }
.page-about .about-pillar:nth-child(2) { border-left-color: var(--yellow); }
.page-about .about-pillar:nth-child(3) { border-left-color: var(--red); }

.page-about .about-pillar__idx {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--grey);
}

.page-about .about-pillar h3 {
  margin: 0;
  font-size: clamp(19px, 2.2vw, 25px);
  letter-spacing: -0.01em;
}

.page-about .about-pillar p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  max-width: 40em;
}

@media (min-width: 920px) {
  .page-about .about-pillar {
    grid-template-columns: 56px minmax(0, 190px) minmax(0, 1fr);
    align-items: start;
    gap: 0 22px;
  }

  .page-about .about-pillar__idx { padding-top: 6px; }
  .page-about .about-pillar p { margin: 0; }
}

/* --- 时间轴 --- */
.page-about .about-track {
  position: relative;
  margin-top: clamp(26px, 4vw, 46px);
}

@media (min-width: 1080px) {
  .page-about .about-track { padding-right: var(--about-rail-w); }
}

.page-about .about-rail {
  display: none;
}

@media (min-width: 1080px) {
  .page-about .about-rail {
    display: block;
    position: absolute;
    right: 0;
    top: 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.34em;
    text-transform: uppercase;
    color: var(--grey);
    white-space: nowrap;
  }
}

.page-about .about-chart {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: clamp(22px, 3.4vw, 38px);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--red) 55%, var(--yellow) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: clamp(30px, 4.6vw, 54px);
  padding-bottom: clamp(16px, 2.2vw, 24px);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 14px;
  height: 14px;
  background: var(--ink);
  border: 2px solid var(--line);
}

.page-about .about-timeline__item:last-child::before {
  border-color: var(--cyan);
  background: var(--cyan);
}

.page-about .about-timeline__fold {
  border: var(--frame);
  background: var(--panel);
  box-shadow: var(--hard-shadow-sm);
  transition: border-color var(--step-fast), background var(--step-fast);
}

.page-about .about-timeline__fold[open] {
  border-color: var(--cyan);
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-timeline__fold > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: clamp(14px, 2vw, 20px) clamp(16px, 2.4vw, 26px);
}

.page-about .about-timeline__fold > summary::-webkit-details-marker { display: none; }

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  min-width: 3.2em;
  transition: color var(--step-fast);
}

.page-about .about-timeline__fold[open] .about-timeline__year {
  color: var(--red);
}

.page-about .about-timeline__title {
  font-size: clamp(15px, 1.9vw, 19px);
  font-weight: 700;
  line-height: 1.4;
  flex: 1 1 14em;
}

.page-about .about-timeline__flag {
  margin-left: auto;
}

.page-about .about-timeline__fold .fold__body {
  padding: 0 clamp(16px, 2.4vw, 26px) clamp(18px, 2.4vw, 24px);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-timeline__fold .fold__body p {
  margin: 0;
  max-width: 42em;
}

/* --- 图片 --- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--frame);
  box-shadow: var(--hard-shadow);
}

.page-about .about-figure .media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--grey);
}

.page-about .about-figure--wide {
  margin-top: clamp(26px, 4vw, 46px);
}

.page-about .about-figure--cover {
  margin-bottom: clamp(26px, 4vw, 46px);
}

/* --- 团队 --- */
.page-about .about-team {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-team .prose {
  margin-top: 16px;
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-role {
  border-left: 3px solid var(--line);
  padding-left: 16px;
}

.page-about .about-role:nth-child(1) { border-left-color: var(--cyan); }
.page-about .about-role:nth-child(2) { border-left-color: var(--yellow); }
.page-about .about-role:nth-child(3) { border-left-color: var(--red); }

.page-about .about-role h3 {
  margin: 0 0 6px;
  font-size: 17px;
  letter-spacing: 0.02em;
}

.page-about .about-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--line);
  max-width: 40em;
}

@media (min-width: 920px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* --- 内容覆盖表 --- */
.page-about .about-table-caption {
  text-align: left;
  padding: 12px 16px 0;
  color: var(--grey);
}

.page-about .table-wrap {
  margin-top: clamp(22px, 3vw, 36px);
  overflow-x: auto;
  border: var(--frame);
  background: var(--ink);
}

.page-about .data-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  color: var(--paper);
}

.page-about .data-table th,
.page-about .data-table td {
  padding: 13px 16px;
  text-align: left;
  border-bottom: var(--hairline);
  font-size: 14px;
  vertical-align: top;
}

.page-about .data-table thead th {
  background: var(--panel);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--line);
}

.page-about .data-table tbody th {
  font-weight: 700;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .data-table tbody tr {
  transition: background var(--step-fast);
}

.page-about .data-table tbody tr:hover {
  background: var(--about-tint);
}

.page-about .data-table .num {
  font-family: var(--font-mono);
  color: var(--cyan);
  white-space: nowrap;
}

/* --- 合作生态 --- */
.page-about .about-coop {
  border-top: 0;
  background: var(--panel);
  clip-path: polygon(0 clamp(24px, 4vw, 52px), 100% 0, 100% 100%, 0 100%);
  padding-top: clamp(60px, 8vw, 112px);
}

.page-about .about-coop .prose.no-top {
  margin-top: 18px;
}

.page-about .about-tabs {
  margin-top: clamp(22px, 3.2vw, 36px);
  position: relative;
}

.page-about .about-tabs__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .about-tabs__bar {
  display: flex;
  flex-wrap: wrap;
  border: var(--frame);
  border-bottom: 0;
}

.page-about .about-tabs__tab {
  flex: 1 1 auto;
  min-width: 150px;
  padding: 13px 18px;
  cursor: pointer;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--line);
  border-right: var(--hairline);
  border-bottom: var(--hairline);
  transition: background var(--step-fast), color var(--step-fast);
}

.page-about .about-tabs__tab:last-child { border-right: 0; }

.page-about .about-tabs__tab:hover { color: var(--cyan); }

.page-about .about-tabs__radio:focus-visible ~ .about-tabs__bar .about-tabs__tab {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about #coop-a:checked ~ .about-tabs__bar [for="coop-a"],
.page-about #coop-b:checked ~ .about-tabs__bar [for="coop-b"],
.page-about #coop-c:checked ~ .about-tabs__bar [for="coop-c"] {
  background: var(--paper);
  color: var(--ink);
  border-bottom-color: var(--paper);
}

.page-about .about-tabs__panels {
  border: var(--frame);
  background: var(--ink);
}

.page-about .about-tabs__panel {
  display: none;
  padding: clamp(20px, 3vw, 34px);
}

.page-about #coop-a:checked ~ .about-tabs__panels [data-panel="a"],
.page-about #coop-b:checked ~ .about-tabs__panels [data-panel="b"],
.page-about #coop-c:checked ~ .about-tabs__panels [data-panel="c"] {
  display: block;
}

.page-about .about-tabs__panel h3 {
  margin: 0 0 12px;
  font-size: clamp(18px, 2.2vw, 23px);
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .about-tabs__panel p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--line);
}

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

.page-about .about-tabs__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .about-tabs__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background: var(--cyan);
}

/* --- 更新节奏 --- */
.page-about .about-cadence {
  display: grid;
  gap: 0;
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .about-cadence__col {
  padding: 20px 0;
  border-bottom: var(--hairline);
}

.page-about .about-cadence__col:last-child { border-bottom: 0; }

.page-about .about-cadence__col h3 {
  margin: 0 0 14px;
  font-size: 17px;
  letter-spacing: 0.04em;
}

.page-about .about-cadence__col--week h3 { color: var(--cyan); }
.page-about .about-cadence__col--season h3 { color: var(--yellow); }
.page-about .about-cadence__col--follow h3 { color: var(--red); }

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

.page-about .about-cadence__col li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--line);
}

.page-about .about-cadence__col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--line);
}

.page-about .about-cadence__col li a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 200, 0.4);
}

.page-about .about-cadence__col li a:hover {
  border-bottom-color: var(--cyan);
}

@media (min-width: 900px) {
  .page-about .about-cadence {
    grid-template-columns: 1.25fr 1fr 1fr;
    gap: 0 clamp(20px, 3vw, 44px);
  }

  .page-about .about-cadence__col {
    border-bottom: 0;
    border-top: 4px solid var(--line);
    padding-top: 22px;
  }

  .page-about .about-cadence__col--week { border-top-color: var(--cyan); }
  .page-about .about-cadence__col--season { border-top-color: var(--yellow); }
  .page-about .about-cadence__col--follow { border-top-color: var(--red); }
}

/* --- 结尾入口 --- */
.page-about .about-cta {
  border-top: var(--frame);
}

.page-about .about-cta .prose {
  margin-top: 18px;
}

.page-about .about-cta .prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 200, 0.45);
}

.page-about .about-cta .prose a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}

@media (max-width: 480px) {
  .page-about .about-cta__links .btn {
    flex: 1 1 100%;
    text-align: center;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.001ms !important;
  }
}
<<<END>>>