.page-about {
  --about-rail-w: 300px;
  --about-rail-top: 112px;
  --about-node-dot: 9px;
}

.page-about .about-crumb-wrap {
  padding-top: 20px;
}

.page-about .about-frame {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding-bottom: 40px;
}

@media (min-width: 960px) {
  .page-about .about-frame {
    grid-template-columns: minmax(0, var(--about-rail-w)) minmax(0, 1fr);
    gap: 64px;
  }
}

/* ---------- 左侧品牌栏 ---------- */
.page-about .about-rail {
  border-top: 3px solid var(--season-accent);
  padding-top: 18px;
}

@media (min-width: 960px) {
  .page-about .about-rail {
    position: sticky;
    top: var(--about-rail-top);
    align-self: start;
  }
}

.page-about .rail-kicker {
  margin: 0 0 14px;
}

.page-about .rail-claim {
  margin: 0;
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .rail-note {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .rail-stats {
  list-style: none;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 12px;
}

.page-about .rail-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  line-height: 1;
  color: var(--cream);
}

.page-about .rail-stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--silver);
}

.page-about .rail-btn {
  margin-top: 26px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 8px;
}

.page-about .about-hero-title {
  margin: 14px 0 0;
  font-size: clamp(32px, 5.4vw, 62px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--cream);
  max-width: 20ch;
}

.page-about .about-hero-lead {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--cream);
}

.page-about .about-hero-lead--muted {
  color: var(--silver);
  font-size: 15px;
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  margin-top: 56px;
}

@media (min-width: 768px) {
  .page-about .about-block {
    margin-top: 88px;
  }
}

.page-about .about-text {
  margin: 18px 0 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-text--after {
  margin-top: 26px;
}

/* ---------- 三种处境 ---------- */
.page-about .scene-grid {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

@media (min-width: 820px) {
  .page-about .scene-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .scene-card {
  background: var(--ink-2);
  padding: 22px 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .scene-title {
  margin: 2px 0 0;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .scene-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver);
}

/* ---------- 团队三个小组 ---------- */
.page-about .team-grid {
  margin-top: 30px;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .team-card {
  position: relative;
  background: var(--ink-2);
  padding: 26px 20px 24px;
  transition: background-color 180ms var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  background: var(--season-soft);
}

.page-about .team-tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--silver);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 3px 8px;
}

.page-about .team-name {
  margin: 14px 0 0;
  font-size: 22px;
  font-weight: 900;
  line-height: 1.25;
  color: var(--cream);
}

.page-about .team-text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .team-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 10px;
}

.page-about .team-list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ice);
}

.page-about .team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 1px;
  background: var(--season-accent);
}

/* ---------- 三道关 ---------- */
.page-about .gate-layout {
  margin-top: 30px;
  display: grid;
  gap: 28px;
}

@media (min-width: 920px) {
  .page-about .gate-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

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

.page-about .gate-step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: 20px 20px 18px;
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .gate-step:hover {
  transform: translateY(-2px);
  border-color: var(--blue);
}

.page-about .gate-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  line-height: 1;
  color: var(--season-accent);
}

.page-about .gate-title {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 800;
  color: var(--cream);
}

.page-about .gate-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .gate-sub {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
  border-left: 1px solid var(--line);
  padding-left: 14px;
}

.page-about .gate-sub li {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ice);
}

.page-about .gate-figure {
  margin: 0;
}

.page-about .gate-figure .media {
  border: 1px solid var(--line);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-banner {
  margin: 28px 0 0;
  border: 1px solid var(--line);
}

.page-about .timeline {
  position: relative;
  margin-top: 34px;
  padding-left: 26px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--spring-green) 0%,
    var(--spring-yellow) 20%,
    var(--orange) 44%,
    var(--amber) 68%,
    var(--ice) 88%,
    var(--silver) 100%
  );
}

.page-about .tl-node {
  position: relative;
  margin-bottom: 14px;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 20px;
  width: var(--about-node-dot);
  height: var(--about-node-dot);
  background: var(--ink);
  border: 1px solid var(--silver);
  transform: rotate(45deg);
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .tl-node[open]::before {
  background: var(--season-accent);
  border-color: var(--season-accent);
}

.page-about .tl-node > summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  padding: 16px 46px 16px 18px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

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

.page-about .tl-node > summary:hover,
.page-about .tl-node > summary:focus-visible {
  border-color: var(--blue);
}

.page-about .tl-node > summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.page-about .tl-node > summary::after {
  content: "＋";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--silver);
}

.page-about .tl-node[open] > summary::after {
  content: "－";
  color: var(--season-accent);
}

.page-about .tl-era {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .tl-title {
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .tl-body {
  border: 1px solid var(--line);
  border-top: 0;
  padding: 16px 18px 18px;
  background: var(--ink);
}

.page-about .tl-body p {
  margin: 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .tl-node--full > summary {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .tl-node--full > summary .tl-title,
.page-about .tl-node--full > summary .tl-era {
  color: var(--cream-ink);
}

.page-about .tl-node--full > summary::after {
  color: var(--cream-ink);
}

.page-about .tl-node--full .tl-body {
  border-color: var(--orange);
  background: var(--ink-2);
}

@media (min-width: 900px) {
  .page-about .tl-node--s {
    margin-right: 42%;
  }

  .page-about .tl-node--m {
    margin-right: 26%;
  }

  .page-about .tl-node--l {
    margin-right: 12%;
  }

  .page-about .tl-node--full {
    margin-right: 0;
  }

  .page-about .tl-node--offset {
    margin-left: 48px;
  }
}

/* ---------- 四季理念 ---------- */
.page-about .season-grid {
  margin-top: 30px;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

@media (min-width: 760px) {
  .page-about .season-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .season-cell {
  background: var(--ink-2);
  padding: 0 18px 22px;
}

.page-about .season-cell::before {
  content: "";
  display: block;
  height: 5px;
  margin: 0 -18px 18px;
}

.page-about .season-cell--spring::before {
  background: linear-gradient(90deg, var(--spring-green) 0 58%, var(--spring-yellow) 58% 100%);
}

.page-about .season-cell--summer::before {
  background: linear-gradient(90deg, var(--orange) 0 58%, var(--blue) 58% 100%);
}

.page-about .season-cell--autumn::before {
  background: linear-gradient(90deg, var(--amber) 0 58%, var(--cream-ink) 58% 100%);
}

.page-about .season-cell--winter::before {
  background: linear-gradient(90deg, var(--ice) 0 58%, var(--silver) 58% 100%);
}

.page-about .season-name {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 900;
  color: var(--cream);
}

.page-about .season-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.78;
  color: var(--silver);
}

/* ---------- 合作伙伴 ---------- */
.page-about .partner-layout {
  margin-top: 30px;
  display: grid;
  gap: 28px;
}

@media (min-width: 900px) {
  .page-about .partner-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

.page-about .partner-copy .about-text:first-child {
  margin-top: 0;
}

.page-about .partner-copy .btn {
  margin-top: 24px;
}

.page-about .partner-figure {
  margin: 0;
}

.page-about .partner-figure .media {
  border: 1px solid var(--line);
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  margin-top: 80px;
  padding-top: 56px;
  border-top: 1px solid var(--line);
  padding-bottom: 48px;
}

@media (min-width: 768px) {
  .page-about .about-close {
    margin-top: 128px;
    padding-top: 88px;
    padding-bottom: 72px;
  }
}

.page-about .close-title {
  max-width: 22ch;
}

.page-about .close-lead {
  max-width: 58ch;
}

.page-about .close-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .close-band {
  margin-top: 72px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 2px;
  height: 10px;
}

@media (min-width: 768px) {
  .page-about .close-band {
    margin-top: 112px;
  }
}

.page-about .close-seg {
  display: block;
  height: 100%;
}

.page-about .close-seg--spring {
  background: var(--spring-green);
}

.page-about .close-seg--summer {
  background: var(--orange);
}

.page-about .close-seg--autumn {
  background: var(--amber);
}

.page-about .close-seg--winter {
  background: var(--ice);
}

.page-about .close-note {
  margin: 20px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--silver);
}

/* ---------- 图片通用 ---------- */
.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}
<<<END>>>