.page-about {
  --about-measure: 620px;
  --about-rail: 92px;
  background: var(--paper);
  color: var(--ink);
}

/* 面包屑 */
.page-about .breadcrumb {
  padding: clamp(18px, 3vw, 28px) 0 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .breadcrumb__link {
  color: var(--cyan);
  text-decoration: none;
}
.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--ink);
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(26px, 5vw, 56px) 0 clamp(28px, 4vw, 46px);
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero .eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--grape);
  margin: 0 0 clamp(14px, 2.4vw, 22px);
}
.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.3rem, 8.2vw, 5rem);
  line-height: 1.06;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin: 0 0 clamp(18px, 3vw, 28px);
  max-width: 16ch;
}
.page-about .about-hero__lede {
  font-size: clamp(16px, 2vw, 18px);
  line-height: 1.85;
  color: var(--ink);
  max-width: var(--about-measure);
  margin: 0 0 clamp(26px, 4vw, 40px);
}
.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-stat {
  background: var(--paper);
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 26px);
  letter-spacing: 0.04em;
  color: var(--deep);
  line-height: 1.1;
}
.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

/* 长卷骨架 */
.page-about .about-scroll {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}
.page-about .about-body {
  min-width: 0;
  padding: clamp(10px, 2vw, 18px) 0 clamp(40px, 6vw, 64px);
}
.page-about .about-index {
  display: none;
}

/* 章节 */
.page-about .about-chapter {
  padding: clamp(34px, 5vw, 60px) 0;
}
.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin-bottom: 10px;
}
.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 4vw, 2.1rem);
  line-height: 1.28;
  letter-spacing: 0.01em;
  color: var(--deep);
  margin: 0 0 clamp(18px, 3vw, 26px);
}
.page-about .about-chapter__body p {
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
  max-width: var(--about-measure);
  margin: 0 0 1.1em;
}
.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}
.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1px;
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* 引用 */
.page-about .about-quote {
  max-width: var(--about-measure);
  margin: 1.4em 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--gold);
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2.4vw, 1.25rem);
  line-height: 1.7;
  color: var(--deep);
}

/* 图片 */
.page-about .about-fig {
  margin: 0 0 clamp(22px, 3.4vw, 32px);
}
.page-about .about-fig__frame {
  background: var(--band);
  overflow: hidden;
  border: 1px solid var(--line);
}
.page-about .about-fig__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-fig__caption {
  font-size: 13px;
  line-height: 1.7;
  color: var(--cyan);
  padding-top: 10px;
  letter-spacing: 0.02em;
}
.page-about .about-fig--wide .about-fig__frame {
  aspect-ratio: 2 / 1;
}
.page-about .about-fig--square {
  max-width: 520px;
}
.page-about .about-fig--square .about-fig__frame {
  aspect-ratio: 1 / 1;
}
.page-about .about-fig--tall .about-fig__frame {
  aspect-ratio: 8 / 11;
}

/* 色带过渡 */
.page-about .about-band {
  height: 56px;
  background-color: var(--band);
  background-image: repeating-linear-gradient(
    45deg,
    rgba(63, 126, 136, 0.09) 0 2px,
    transparent 2px 15px
  );
}

/* 字段表 */
.page-about .about-table-wrap {
  overflow-x: auto;
  margin: clamp(16px, 3vw, 26px) 0;
  border: 1px solid var(--line);
  background: var(--paper-solid);
}
.page-about .about-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.7;
}
.page-about .about-table caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--deep);
  background: var(--band);
  border-bottom: 1px solid var(--line);
}
.page-about .about-table th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--deep);
  background: var(--band);
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.page-about .about-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  vertical-align: top;
}
.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}
.page-about .about-table td.mono,
.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}
.page-about .about-table td.mono {
  color: var(--deep);
  white-space: nowrap;
}

/* 折叠 */
.page-about .about-details {
  max-width: var(--about-measure);
  margin: clamp(16px, 3vw, 24px) 0;
  background: var(--glass);
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
}
.page-about .about-details > summary {
  cursor: pointer;
  list-style: none;
  padding: 14px 18px;
  font-size: 15px;
  color: var(--deep);
  letter-spacing: 0.02em;
}
.page-about .about-details > summary::-webkit-details-marker {
  display: none;
}
.page-about .about-details > summary::before {
  content: "+";
  font-family: var(--font-mono);
  color: var(--gold);
  margin-right: 10px;
}
.page-about .about-details[open] > summary::before {
  content: "−";
}
.page-about .about-details__body {
  padding: 0 18px 16px;
}
.page-about .about-details__body p {
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 0.9em;
}
.page-about .about-details__body p:last-child {
  margin-bottom: 0;
}

/* 团队深色块 */
.page-about .about-team {
  background: var(--deep);
  color: #EAF1F2;
  margin: 0 calc(var(--pad) * -1);
  padding: clamp(34px, 5vw, 60px) var(--pad);
}
.page-about .about-team .about-chapter__num {
  color: var(--gold-soft);
}
.page-about .about-team .about-chapter__title {
  color: #F4F8F8;
}
.page-about .about-team .about-chapter__body p {
  color: rgba(244, 248, 248, 0.88);
}
.page-about .about-roles {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  max-width: 720px;
}
.page-about .about-role {
  display: block;
  padding: 16px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}
.page-about .about-role:first-child {
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}
.page-about .about-role__top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-size: 16px;
  color: #F4F8F8;
}
.page-about .about-role__name {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.4vw, 19px);
  letter-spacing: 0.02em;
}
.page-about .about-role__num {
  color: var(--gold-soft);
  font-size: 13px;
  white-space: nowrap;
}
.page-about .about-role__track {
  display: block;
  height: 6px;
  margin: 12px 0 10px;
  background: rgba(255, 255, 255, 0.16);
}
.page-about .about-role__fill {
  display: block;
  height: 100%;
  width: var(--w, 20%);
  background: var(--gold);
}
.page-about .about-role__desc {
  display: block;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 248, 248, 0.76);
}

/* 茶座 */
.page-about .about-tea {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}
.page-about .about-tea__text p {
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
  margin: 0 0 1.1em;
}
.page-about .about-tea__text p:last-child {
  margin-bottom: 0;
}

/* 里程碑 */
.page-about .about-milestones {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0 0 0 26px;
  position: relative;
}
.page-about .about-milestones::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--line);
}
.page-about .about-milestone {
  position: relative;
  padding: 0 0 22px;
}
.page-about .about-milestone::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 10px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px var(--paper);
}
.page-about .about-milestone__item {
  border: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-about .about-milestone__item[open] {
  background: var(--paper-solid);
  border-color: var(--line);
}
.page-about .about-milestone__summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 4px 8px 4px 0;
}
.page-about .about-milestone__summary::-webkit-details-marker {
  display: none;
}
.page-about .about-milestone__year {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  flex: none;
}
.page-about .about-milestone__title {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.6vw, 21px);
  letter-spacing: 0.02em;
  color: var(--deep);
  transition: color var(--dur) var(--ease);
}
.page-about .about-milestone__summary:hover .about-milestone__title,
.page-about .about-milestone__summary:focus-visible .about-milestone__title {
  color: var(--gold);
}
.page-about .about-milestone__note {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  margin: 8px 0 14px;
  padding: 0 16px 0 2px;
  max-width: var(--about-measure);
}

/* 收尾行动区 */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 56px);
  padding: clamp(26px, 4vw, 44px);
  background-color: var(--glass);
  background-image: linear-gradient(135deg, rgba(239, 217, 163, 0.46), rgba(227, 237, 239, 0.62));
  border: 1px solid var(--line);
  border-top: 3px solid var(--gold);
}
.page-about .about-cta__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.4vw, 1.85rem);
  line-height: 1.3;
  color: var(--deep);
  margin: 0 0 12px;
}
.page-about .about-cta__text {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 52ch;
  margin: 0 0 clamp(20px, 3vw, 28px);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 平板及以上 */
@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-chapter__head {
    display: grid;
    grid-template-columns: 46px minmax(0, 1fr);
    gap: 0 20px;
    align-items: start;
  }
  .page-about .about-chapter__num {
    writing-mode: vertical-rl;
    text-orientation: upright;
    letter-spacing: 0.28em;
    margin-bottom: 0;
    padding-left: 10px;
    padding-top: 2px;
    border-left: 1px solid var(--line);
    align-self: stretch;
  }
  .page-about .about-chapter__title {
    margin-bottom: 0;
  }
  .page-about .about-chapter__head + .about-chapter__body,
  .page-about .about-chapter__head + .about-fig,
  .page-about .about-chapter__head + .about-tea,
  .page-about .about-chapter__head + .about-milestones,
  .page-about .about-chapter__head + .about-roles {
    margin-top: clamp(20px, 3vw, 30px);
  }
  .page-about .about-chapter__body,
  .page-about .about-fig,
  .page-about .about-table-wrap,
  .page-about .about-details,
  .page-about .about-milestones,
  .page-about .about-tea,
  .page-about .about-roles {
    margin-left: 66px;
  }
  .page-about .about-team .about-chapter__body,
  .page-about .about-team .about-roles {
    margin-left: 66px;
  }
  .page-about .about-tea {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: clamp(24px, 4vw, 44px);
  }
  .page-about .about-fig--tall {
    margin-bottom: 0;
  }
}

/* 桌面 */
@media (min-width: 1000px) {
  .page-about .about-scroll {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0 clamp(24px, 4vw, 56px);
  }
  .page-about .about-index {
    display: block;
    padding-top: clamp(40px, 5vw, 62px);
  }
  .page-about .about-index__list {
    list-style: none;
    margin: 0;
    padding: 0;
    position: sticky;
    top: 92px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }
  .page-about .about-index__link {
    display: block;
    writing-mode: vertical-rl;
    text-orientation: upright;
    font-size: 13px;
    letter-spacing: 0.24em;
    color: var(--cyan);
    text-decoration: none;
    padding: 2px 0;
    transition: color var(--dur) var(--ease);
  }
  .page-about .about-index__num {
    color: var(--gold);
    margin-bottom: 8px;
    letter-spacing: 0.1em;
  }
  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    color: var(--gold);
  }
  .page-about .about-milestones {
    padding-left: 0;
    max-width: 860px;
  }
  .page-about .about-milestones::before {
    left: 50%;
    transform: translateX(-1px);
  }
  .page-about .about-milestone {
    width: 50%;
    padding: 0 40px 26px 0;
  }
  .page-about .about-milestone::before {
    left: auto;
    right: -6px;
    top: 12px;
  }
  .page-about .about-milestone:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 26px 40px;
  }
  .page-about .about-milestone:nth-child(even)::before {
    right: auto;
    left: -6px;
  }
  .page-about .about-milestone__summary {
    padding-right: 0;
  }
  .page-about .about-milestone__note {
    padding: 0 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-milestone__item,
  .page-about .about-milestone__title,
  .page-about .about-index__link {
    transition-duration: 120ms;
  }
}
<<<END>>>

.page-about {
  --w: 1rem;
}