.page-about {
  --about-marker-w: 208px;
  --about-hair: rgba(159, 179, 200, 0.2);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb-wrap {
  padding-block: 22px 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: 18px 12px;
  position: relative;
}

.page-about .about-hero::before {
  content: "";
  display: block;
  height: 4px;
  width: 132px;
  margin-bottom: 26px;
  background: linear-gradient(90deg, var(--crimson) 0 33%, var(--gold) 33% 66%, var(--green) 66% 100%);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.6vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 12px 0 22px;
  max-width: 15em;
  color: var(--white);
}

.page-about .about-hero__lede {
  max-width: 42em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.9;
  color: var(--steel);
  margin: 0 0 30px;
}

.page-about .about-hero__marks {
  list-style: none;
  margin: 0 0 40px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-mark {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 18px;
  background: var(--night-2);
  border: var(--line) solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.page-about .about-mark__num {
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--gold);
  line-height: 1;
}

.page-about .about-mark__label {
  font-size: 13px;
  color: var(--steel);
  letter-spacing: 0.02em;
}

.page-about .about-hero__media {
  margin: 0;
  border: var(--line) solid var(--ink);
  box-shadow: var(--shadow-soft);
  position: relative;
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 7;
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding-block: clamp(52px, 7vw, 88px);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-head {
  margin-bottom: clamp(26px, 3.6vw, 42px);
}

.page-about .about-head .section-head__note {
  color: var(--steel);
  max-width: 38em;
}

.page-about .about-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-marker {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-left: 14px;
  border-left: 4px solid var(--gold);
}

.page-about .about-marker__num {
  font-size: 26px;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-marker__label {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .about-body p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-body p:last-child {
  margin-bottom: 0;
}

.page-about .about-link {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.18s ease, color 0.18s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--gold);
  outline: none;
}

.page-about .about-note {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--crimson);
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 悬停说明 ---------- */
.page-about .tip {
  position: relative;
  color: var(--gold);
  border-bottom: 1px dashed var(--gold);
  cursor: help;
  outline-offset: 4px;
}

.page-about .tip::after {
  content: attr(data-tip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  transform: translate(-50%, 6px);
  min-width: 12em;
  max-width: 22em;
  padding: 9px 12px;
  background: var(--ink);
  color: var(--white);
  border: 1px solid var(--gold);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.6;
  white-space: normal;
  text-align: left;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
  z-index: 6;
}

.page-about .tip:hover::after,
.page-about .tip:focus-visible::after {
  opacity: 1;
  transform: translate(-50%, 0);
}

.page-about .tip:focus-visible {
  outline: 2px solid var(--gold);
}

/* ---------- 团队规模 ---------- */
.page-about .about-team {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-team__item {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num name"
    "num desc";
  gap: 2px 16px;
  align-items: center;
  padding: 16px 18px;
  background: var(--night-2);
  border: var(--line) solid var(--ink);
  border-left: 5px solid var(--green);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-left-color 0.18s ease;
}

.page-about .about-team__item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hard);
  border-left-color: var(--gold);
}

.page-about .about-team__item--total {
  background: var(--crimson);
  border-left-color: var(--ink);
}

.page-about .about-team__num {
  grid-area: num;
  font-size: 30px;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-team__item--total .about-team__num,
.page-about .about-team__item--total .about-team__name {
  color: var(--white);
}

.page-about .about-team__item--total .about-team__desc {
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-team__name {
  grid-area: name;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 17px;
  color: var(--white);
}

.page-about .about-team__desc {
  grid-area: desc;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 40px 0 0;
  border: var(--line) solid var(--ink);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 12 / 8;
}

.page-about .about-figure.media-frame--wide img {
  aspect-ratio: 12 / 7;
}

/* ---------- 更新节拍 ---------- */
.page-about .about-beats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 26px;
}

.page-about .beat {
  padding: 22px 20px;
  background: var(--night-2);
  border: var(--line) solid var(--ink);
  border-top: 5px solid var(--gold);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-top-color 0.18s ease;
}

.page-about .beat:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hard);
  border-top-color: var(--crimson);
}

.page-about .beat__time {
  display: block;
  font-size: 30px;
  line-height: 1;
  color: var(--gold);
  margin-bottom: 12px;
}

.page-about .beat__title {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 18px;
  color: var(--white);
}

.page-about .beat__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  border-left: 3px solid var(--night-2);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 32px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -40px;
  top: 6px;
  width: 15px;
  height: 15px;
  background: var(--night);
  border: 3px solid var(--gold);
  transform: rotate(45deg);
  transition: background 0.18s ease, border-color 0.18s ease;
}

.page-about .tl-item:hover::before {
  background: var(--crimson);
  border-color: var(--gold);
}

.page-about .tl-item__year {
  display: inline-block;
  font-size: 20px;
  line-height: 1;
  color: var(--gold);
  margin-bottom: 8px;
}

.page-about .tl-item__title {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 18px;
  color: var(--white);
}

.page-about .tl-item__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 用户与生态指标 ---------- */
.page-about .about-metrics {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-metric {
  padding: 18px 16px;
  background: var(--night-2);
  border: var(--line) solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.page-about .about-metric__num {
  display: block;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.1;
  color: var(--gold);
  margin-bottom: 8px;
}

.page-about .about-metric__label {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 品牌色板 ---------- */
.page-about .about-chapter--palette {
  background: var(--night-2);
  border-top: var(--line) solid var(--ink);
}

.page-about .about-swatches {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(136px, 1fr));
  gap: 14px;
}

.page-about .swatch {
  border: var(--line) solid var(--ink);
  background: var(--night);
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.page-about .swatch:hover,
.page-about .swatch:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hard);
  border-color: var(--gold);
}

.page-about .swatch__chip {
  display: block;
  height: 76px;
  border-bottom: var(--line) solid var(--ink);
}

.page-about .swatch--night .swatch__chip { background: var(--night); }
.page-about .swatch--night2 .swatch__chip { background: var(--night-2); }
.page-about .swatch--crimson .swatch__chip { background: var(--crimson); }
.page-about .swatch--gold .swatch__chip { background: var(--gold); }
.page-about .swatch--green .swatch__chip { background: var(--green); }
.page-about .swatch--white .swatch__chip { background: var(--white); }
.page-about .swatch--steel .swatch__chip { background: var(--steel); }
.page-about .swatch--sand .swatch__chip { background: var(--sand); }

.page-about .swatch__meta {
  display: block;
  padding: 12px 13px 14px;
}

.page-about .swatch__name {
  display: block;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 14px;
  color: var(--white);
  margin-bottom: 4px;
}

.page-about .swatch__hex {
  display: block;
  font-size: 12px;
  color: var(--steel);
  opacity: 0.6;
  transition: opacity 0.18s ease, color 0.18s ease;
}

.page-about .swatch:hover .swatch__hex,
.page-about .swatch:focus-within .swatch__hex {
  opacity: 1;
  color: var(--gold);
}

.page-about .swatch__use {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 收尾 ---------- */
.page-about .about-tail {
  padding-block: clamp(48px, 6vw, 80px) clamp(56px, 7vw, 96px);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-tail .rule {
  border: 0;
  height: 4px;
  width: 108px;
  margin: 0 0 26px;
  background: linear-gradient(90deg, var(--crimson) 0 50%, var(--gold) 50% 100%);
}

.page-about .about-tail .endnote {
  max-width: 46em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.6;
  color: var(--white);
  margin: 0;
}

/* ---------- ≥640px ---------- */
@media (min-width: 640px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

/* ---------- ≥900px 非对称分栏 ---------- */
@media (min-width: 900px) {
  .page-about .about-row {
    grid-template-columns: var(--about-marker-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-marker {
    position: sticky;
    top: 96px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .page-about .about-marker__num {
    font-size: 34px;
  }

  .page-about .about-body p {
    font-size: 17px;
  }

  .page-about .about-figure {
    margin-top: 52px;
  }

  .page-about .about-chapter--palette .about-swatches {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
}

/* ---------- ≥1180px ---------- */
@media (min-width: 1180px) {
  .page-about .about-hero__title {
    max-width: 13em;
  }

  .page-about .about-body p {
    max-width: 46em;
  }

  .page-about .about-team__num {
    font-size: 36px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__item,
  .page-about .beat,
  .page-about .swatch,
  .page-about .tip::after {
    transition: none;
  }
}
<<<END>>>