.page-about {
  --about-rule: rgba(43, 76, 111, .22);
  --about-rule-soft: rgba(43, 76, 111, .12);
  --about-tier-bg: #F2E9D8;

  background: var(--paper-100);
  color: var(--ink-900);
  overflow-x: hidden;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 52px) 0 clamp(40px, 6vw, 84px);
  background:
    radial-gradient(120% 90% at 92% -12%, rgba(200, 145, 42, .18), transparent 58%),
    radial-gradient(80% 70% at 4% 108%, rgba(63, 136, 116, .14), transparent 60%),
    linear-gradient(160deg, var(--ink-900) 0%, var(--ink-700) 100%);
  color: var(--paper-100);
  border-bottom: 1px solid var(--ink-500);
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(20px, 4vw, 40px);
}
.page-about .about-hero__crumb,
.page-about .about-hero__crumb a {
  color: var(--muted-on-ink);
  text-decoration: none;
}
.page-about .about-hero__crumb a:hover,
.page-about .about-hero__crumb a:focus-visible {
  color: var(--gold-500);
}
.page-about .about-hero__crumb [aria-current="page"] {
  color: var(--paper-100);
}

.page-about .about-hero__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
  align-items: end;
}

.page-about .about-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold-500);
}
.page-about .about-hero__eyebrow-num {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid rgba(200, 145, 42, .55);
  border-radius: 2px;
  font-size: 11.5px;
  letter-spacing: .1em;
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 5.2vw, 54px);
  line-height: 1.2;
  letter-spacing: .035em;
  color: var(--paper-100);
}

.page-about .about-hero__lead {
  max-width: 46ch;
  margin: 0 0 30px;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(247, 243, 234, .84);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: rgba(43, 76, 111, .55);
  border: 1px solid rgba(43, 76, 111, .7);
  border-radius: 2px;
  overflow: hidden;
}
.page-about .about-hero__stat {
  background: rgba(11, 26, 43, .62);
  padding: 16px 12px;
}
.page-about .about-hero__stat-label {
  margin: 0 0 8px;
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--muted-on-ink);
}
.page-about .about-hero__stat-value {
  display: flex;
  align-items: baseline;
  gap: 3px;
  margin: 0;
  font-family: var(--font-mono);
  color: var(--paper-100);
}
.page-about .about-hero__stat-num {
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: .01em;
}
.page-about .about-hero__stat-unit {
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--gold-500);
}

/* ============ 章节骨架 ============ */
.page-about .about-sec {
  padding: clamp(44px, 7vw, 96px) 0;
  border-top: 1px solid var(--about-rule);
}
.page-about .about-sec--paper { background: var(--paper-100); }
.page-about .about-sec--tint { background: var(--paper-200); }
.page-about .about-sec--ink {
  background: var(--ink-900);
  color: var(--paper-100);
  border-top-color: var(--ink-500);
}

.page-about .about-spread {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 3vw, 28px);
}

.page-about .about-spread__aside {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.page-about .about-spread__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--gray-300);
}
.page-about .about-sec--ink .about-spread__num {
  color: rgba(140, 160, 182, .5);
}
.page-about .about-spread__kicker {
  margin: 0;
  padding-top: 7px;
  border-top: 1px solid var(--gold-500);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold-500);
}

.page-about .about-spread__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 33px);
  font-weight: 600;
  line-height: 1.36;
  letter-spacing: .04em;
  color: var(--ink-900);
}
.page-about .about-sec--ink .about-spread__title {
  color: var(--paper-100);
}

.page-about .about-spread__body > p {
  max-width: 60ch;
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-700);
}
.page-about .about-sec--ink .about-spread__body > p {
  color: rgba(247, 243, 234, .82);
}
.page-about .about-spread__body > p:last-child {
  margin-bottom: 0;
}

/* ============ 01 能力点 ============ */
.page-about .about-points {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--about-rule);
}
.page-about .about-point {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-rule-soft);
  transition: background-color var(--dur) var(--ease);
}
.page-about .about-point:hover {
  background: rgba(200, 145, 42, .05);
}
.page-about .about-point__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gold-500);
  padding-top: 3px;
}
.page-about .about-point__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--ink-900);
}
.page-about .about-point__text {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--gray-600);
}

/* ============ 02 会员层级 ============ */
.page-about .about-tiers {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 32px;
}

.page-about .about-tier {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--paper-100);
  border: 1px solid var(--about-rule);
  border-radius: 2px;
  box-shadow: var(--shadow-card);
  transition: transform var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}
.page-about .about-tier::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 26px;
  background: var(--gold-500);
  transition: background-color var(--dur) var(--ease);
}
.page-about .about-tier:hover,
.page-about .about-tier:focus-within {
  transform: translateY(-2px);
  border-color: var(--orange-600);
  background: var(--about-tier-bg);
}
.page-about .about-tier:hover::before {
  background: var(--orange-600);
}
.page-about .about-tier__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--gold-500);
}
.page-about .about-tier__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--ink-900);
}
.page-about .about-tier__for {
  margin: 0 0 14px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--celadon-500);
}
.page-about .about-tier__list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--gray-600);
}
.page-about .about-tier__list li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 4px;
}
.page-about .about-tier__list li:last-child { margin-bottom: 0; }
.page-about .about-tier__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 6px;
  height: 1px;
  background: var(--gold-500);
}

/* ============ 03 更新节奏 ============ */
.page-about .about-rhythm {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 32px;
  background: rgba(43, 76, 111, .6);
  border: 1px solid var(--ink-500);
  border-radius: 2px;
  overflow: hidden;
}
.page-about .about-rhythm__item {
  padding: 22px 20px 24px;
  background: rgba(11, 26, 43, .55);
  transition: background-color var(--dur) var(--ease);
}
.page-about .about-rhythm__item:hover {
  background: rgba(22, 50, 79, .92);
}
.page-about .about-rhythm__freq {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--gold-500);
}
.page-about .about-rhythm__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--paper-100);
}
.page-about .about-rhythm__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(247, 243, 234, .76);
}

/* ============ 图片 ============ */
.page-about .about-figure {
  margin: 30px 0 32px;
  border: 1px solid var(--about-rule);
  border-radius: 2px;
  background: var(--ink-900);
  overflow: hidden;
}
.page-about .about-sec--narrow .about-figure {
  border-color: var(--about-rule-soft);
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.8) contrast(1.02);
}
.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--ink-500);
  font-size: 12.5px;
  letter-spacing: .05em;
  line-height: 1.7;
  color: var(--muted-on-ink);
}

/* ============ 04 时间线 ============ */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 26px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold-500) 0%, var(--ink-500) 72%, transparent 100%);
}
.page-about .about-tl-node {
  position: relative;
  padding: 0 0 30px;
}
.page-about .about-tl-node:last-child {
  padding-bottom: 0;
}
.page-about .about-tl-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper-100);
  border: 2px solid var(--gold-500);
  transition: background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}
.page-about .about-tl-node:hover::before,
.page-about .about-tl-node:focus-within::before {
  background: var(--orange-600);
  border-color: var(--orange-600);
  transform: scale(1.15);
}
.page-about .about-tl-node__year {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 500;
  letter-spacing: .05em;
  color: var(--gold-500);
}
.page-about .about-tl-node__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--ink-900);
}
.page-about .about-tl-node__desc {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--gray-600);
}

/* ============ 05 团队指标 ============ */
.page-about .about-metrics {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  margin: 28px 0 26px;
  padding: 0;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
  border-radius: 2px;
  overflow: hidden;
}
.page-about .about-metric {
  padding: 20px 18px 22px;
  background: var(--paper-100);
  transition: background-color var(--dur) var(--ease);
}
.page-about .about-metric:hover {
  background: var(--paper-200);
}
.page-about .about-metric__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 34px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--ink-900);
}
.page-about .about-metric__label {
  margin: 8px 0 0;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--gray-600);
}
.page-about .about-body-gap {
  margin-bottom: 0 !important;
}

/* ============ 06 合作生态 ============ */
.page-about .about-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
}
.page-about .about-tags li {
  padding: 6px 13px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--celadon-500);
  background: rgba(63, 136, 116, .07);
  border: 1px solid rgba(63, 136, 116, .42);
  border-radius: 2px;
  transition: border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}
.page-about .about-tags li:hover {
  border-color: var(--celadon-500);
  background: rgba(63, 136, 116, .14);
}

.page-about .about-awards {
  margin-top: 30px;
  padding: 20px 20px 22px;
  background: var(--paper-200);
  border-left: 3px solid var(--gold-500);
  border-radius: 2px;
}
.page-about .about-awards__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--ink-900);
}
.page-about .about-awards__list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--ink-700);
}
.page-about .about-awards__list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
}
.page-about .about-awards__year {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--gold-500);
}

/* ============ 收尾行动 ============ */
.page-about .about-cta {
  padding: clamp(44px, 6vw, 84px) 0;
  background:
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-700) 100%);
  border-top: 1px solid var(--ink-500);
  color: var(--paper-100);
}
.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: center;
}
.page-about .about-cta__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold-500);
}
.page-about .about-cta__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: .04em;
  color: var(--paper-100);
}
.page-about .about-cta__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247, 243, 234, .8);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 断点 ============ */
@media (min-width: 640px) {
  .page-about .about-hero__stat {
    padding: 18px 16px;
  }
  .page-about .about-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: 1px solid var(--about-rule);
  }
  .page-about .about-point {
    grid-template-columns: minmax(0, 1fr);
    column-gap: 0;
    padding: 22px 20px 22px 0;
    border-bottom: 1px solid var(--about-rule-soft);
    border-right: 1px solid var(--about-rule-soft);
  }
  .page-about .about-point:not(:first-child) {
    padding-left: 20px;
  }
  .page-about .about-point:last-child {
    border-right: 0;
    padding-right: 0;
  }
  .page-about .about-point__num {
    grid-row: auto;
    padding-top: 0;
    margin-bottom: 10px;
  }
  .page-about .about-tiers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
  .page-about .about-rhythm {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__layout {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .9fr);
    gap: clamp(36px, 5vw, 72px);
  }
  .page-about .about-spread {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 52px);
  }
  .page-about .about-spread__aside {
    display: block;
    position: sticky;
    top: 32px;
    align-self: start;
  }
  .page-about .about-spread__kicker {
    margin-top: 14px;
    display: inline-block;
  }
  .page-about .about-spread--narrow {
    grid-template-columns: 92px minmax(0, 720px);
  }
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 48px;
  }
  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (min-width: 1080px) {
  .page-about .about-tiers {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    align-items: start;
  }
  .page-about .about-tier:nth-child(1) { margin-top: 0; }
  .page-about .about-tier:nth-child(2) { margin-top: 16px; }
  .page-about .about-tier:nth-child(3) { margin-top: 32px; }
  .page-about .about-tier:nth-child(4) { margin-top: 48px; }
  .page-about .about-tier__list {
    font-size: 13.5px;
  }
}

@media (max-width: 420px) {
  .page-about .about-hero__stat {
    padding: 14px 9px;
  }
  .page-about .about-hero__stat-label {
    font-size: 10.5px;
    letter-spacing: .08em;
  }
  .page-about .about-hero__stat-unit {
    font-size: 10.5px;
  }
  .page-about .about-tags li {
    font-size: 12px;
    padding: 5px 10px;
  }
}
<<<END>>>