.page-about {
  --about-rule: 30px;
  --about-rail-w: 168px;
}

.page-about .about-crumb-wrap {
  padding-top: clamp(14px, 2vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--sand);
  padding-block: clamp(20px, 3vw, 36px) clamp(34px, 5vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -24%;
  right: -8%;
  width: 46%;
  height: 156%;
  background: repeating-linear-gradient(45deg, rgba(183, 46, 36, 0.11) 0 2px, transparent 2px 15px);
  transform: skewX(-7deg);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-hero-copy h1 {
  margin: 14px 0 18px;
  font-size: clamp(34px, 5.6vw, 64px);
  line-height: 1.06;
  letter-spacing: 0.04em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-hero-copy .ry-lead {
  font-size: var(--step-3);
  line-height: 1.85;
  max-width: 34em;
  color: var(--ink-70);
}

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

.page-about .about-hero-frame {
  background: var(--paper);
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .about-frame-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.16em;
  color: var(--red);
}

.page-about .about-meta {
  margin: 0;
}

.page-about .about-meta-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-meta-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-meta-row dt {
  font-size: var(--step-2);
  color: var(--ink-70);
}

.page-about .about-meta-row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step-4);
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .about-meta-row dd span {
  margin-left: 4px;
  font-family: var(--font-sans);
  font-size: var(--step-1);
  color: var(--ink-50);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  position: relative;
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 44px);
}

.page-about .about-h2 {
  position: relative;
  margin: 0 0 clamp(16px, 2vw, 24px);
  padding-left: calc(var(--about-rule) + 16px);
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.18;
  letter-spacing: 0.03em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.2em;
  bottom: 0.2em;
  width: var(--about-rule);
  background: var(--red);
}

.page-about .about-h2--blue::before { background: var(--blue); }
.page-about .about-h2--gold::before { background: var(--gold); }
.page-about .about-h2--teal::before { background: var(--teal); }

.page-about .about-p {
  max-width: 36em;
  margin: 0 0 16px;
  font-size: var(--step-3);
  line-height: 1.85;
  color: var(--ink-70);
}

.page-about .about-p--wide {
  max-width: 44em;
}

.page-about .about-side {
  align-self: start;
  padding-top: 6px;
  border-top: 2px solid var(--red);
}

.page-about .about-side-k {
  margin: 12px 0 8px;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.16em;
  color: var(--blue);
}

.page-about .about-side-v {
  margin: 0 0 12px;
  font-size: var(--step-2);
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .about-side-link {
  display: inline-block;
  font-size: var(--step-2);
  color: var(--red);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

/* ---------- 时间线 ---------- */
.page-about .about-tl-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 44px);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-tl-list {
  list-style: none;
  margin: 0;
  padding: 0;
  order: 2;
}

.page-about .about-tl-item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-tl-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-tl-year {
  padding-top: 5px;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  letter-spacing: 0.1em;
  color: var(--red);
}

.page-about .about-tl-body h3 {
  margin: 0 0 8px;
  font-size: var(--step-4);
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .about-tl-body p {
  margin: 0;
  max-width: 34em;
  font-size: var(--step-3);
  line-height: 1.82;
  color: var(--ink-70);
}

.page-about .about-rail {
  order: 1;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}

.page-about .about-rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.18em;
  color: var(--ink-50);
}

.page-about .about-rail-list {
  display: flex;
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  overflow-x: auto;
}

.page-about .about-rail-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  letter-spacing: 0.08em;
  color: var(--ink-50);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.24s var(--ease);
}

.page-about .about-rail-link:hover {
  color: var(--ink);
}

.page-about .about-rail-link[aria-current="true"] {
  color: var(--red);
}

.page-about .about-rail-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line);
  flex: 0 0 auto;
  transition: background 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-about .about-rail-link[aria-current="true"] .about-rail-dot {
  background: var(--red);
  box-shadow: 0 0 0 4px rgba(183, 46, 36, 0.14);
}

/* ---------- 场地 ---------- */
.page-about .about-space-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 44px);
  align-items: start;
}

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

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

/* ---------- 数据带 ---------- */
.page-about .about-band {
  padding-block: clamp(28px, 4vw, 48px);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 28px);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-stat {
  padding-left: 12px;
  border-left: 2px solid rgba(242, 215, 156, 0.45);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--gold-soft);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 6px;
  font-size: var(--step-2);
  line-height: 1.6;
  color: rgba(255, 249, 238, 0.8);
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 44px);
  margin-top: clamp(18px, 2.6vw, 28px);
  align-items: start;
}

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

.page-about .about-team-row {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0 16px 14px;
  border-top: 1px solid var(--line);
  transition: background 0.24s var(--ease);
}

.page-about .about-team-row:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-team-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 3px;
  background: var(--red);
  opacity: 0;
  transition: opacity 0.24s var(--ease);
}

.page-about .about-team-row:hover::before,
.page-about .about-team-row:focus-within::before {
  opacity: 1;
}

.page-about .about-team-name {
  font-size: var(--step-3);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-team-num {
  font-family: var(--font-mono);
  font-size: var(--step-4);
  letter-spacing: 0.04em;
  color: var(--blue);
}

.page-about .about-team-role {
  display: block;
  font-size: var(--step-2);
  line-height: 1.7;
  color: var(--ink-70);
}

.page-about .about-team-extra {
  display: block;
  margin-top: 4px;
  font-size: var(--step-2);
  line-height: 1.7;
  color: var(--ink-50);
  transition: color 0.24s var(--ease);
}

.page-about .about-team-row:hover .about-team-extra,
.page-about .about-team-row:focus-within .about-team-extra {
  color: var(--ink-70);
}

/* ---------- 做事方式 ---------- */
.page-about .about-how-list {
  list-style: none;
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  padding: 0;
}

.page-about .about-how-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-how-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-how-num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-how-item h3 {
  margin: 0 0 8px;
  font-size: var(--step-4);
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .about-how-item p {
  margin: 0;
  max-width: 34em;
  font-size: var(--step-3);
  line-height: 1.8;
  color: var(--ink-70);
}

/* ---------- 合作 ---------- */
.page-about .about-partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 44px);
  align-items: start;
}

.page-about .about-partner-grid .about-p:last-of-type {
  margin-bottom: 20px;
}

/* ---------- 会员 ---------- */
.page-about .about-section--member {
  background: linear-gradient(180deg, var(--sand) 0%, rgba(244, 235, 220, 0.65) 100%);
}

.page-about .about-levels {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 22px;
  padding: 0;
}

.page-about .about-level {
  padding: 14px 14px 12px;
  background: var(--paper);
  border-top: 3px solid var(--gold);
}

.page-about .about-level:nth-child(2) { border-top-color: var(--blue); }
.page-about .about-level:nth-child(3) { border-top-color: var(--teal); }
.page-about .about-level:nth-child(4) { border-top-color: var(--red); }

.page-about .about-level-k {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.14em;
  color: var(--ink-50);
}

.page-about .about-level-t {
  display: block;
  margin: 4px 0 6px;
  font-size: var(--step-3);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-level p {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.7;
  color: var(--ink-70);
}

.page-about .about-section--member .about-p:last-of-type {
  margin-bottom: 20px;
}

/* ---------- 结尾邀请 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  background: var(--red-deep);
  color: var(--paper);
  padding-block: clamp(34px, 5vw, 62px);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -6%;
  width: 42%;
  height: 170%;
  background: repeating-linear-gradient(30deg, rgba(242, 215, 156, 0.14) 0 2px, transparent 2px 16px);
  transform: skewX(-7deg);
  pointer-events: none;
}

.page-about .about-cta-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.18;
  letter-spacing: 0.03em;
  font-weight: 900;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 34em;
  font-size: var(--step-3);
  line-height: 1.8;
  color: rgba(255, 249, 238, 0.82);
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-cta-line {
  color: var(--paper);
  border-color: rgba(255, 249, 238, 0.55);
}

.page-about .about-cta-line:hover {
  color: var(--paper);
  border-color: var(--paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.9fr);
  }

  .page-about .about-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
  }

  .page-about .about-tl-item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 24px;
  }

  .page-about .about-team-row {
    grid-template-columns: 156px 92px minmax(0, 1fr);
    align-items: center;
    gap: 20px;
    min-height: 56px;
    padding: 14px 0 14px 18px;
  }

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

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

@media (min-width: 940px) {
  .page-about .about-tl-layout {
    grid-template-columns: minmax(0, 1fr) var(--about-rail-w);
    gap: clamp(28px, 3vw, 52px);
    align-items: start;
  }

  .page-about .about-rail {
    order: 0;
    position: sticky;
    top: 96px;
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-about .about-rail-list {
    display: block;
    overflow: visible;
    border-left: 1px solid var(--line);
    padding-left: 0;
  }

  .page-about .about-rail-link {
    position: relative;
    padding: 9px 0 9px 18px;
  }

  .page-about .about-rail-dot {
    position: absolute;
    left: -4px;
    top: 50%;
    margin-top: -4px;
  }

  .page-about .about-space-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-partner-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
  }

  .page-about .about-space-grid .about-figure {
    margin-top: 24px;
  }
}

@media (min-width: 1140px) {
  .page-about .about-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail-dot,
  .page-about .about-team-row,
  .page-about .about-team-extra,
  .page-about .about-team-row::before {
    transition: none;
  }
}
<<<END>>>