.page-about {
  --about-rail: 176px;
  --about-sticky-top: 112px;
  background: var(--c-deep);
  color: var(--text);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 44px;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -140px;
  right: -200px;
  width: min(560px, 118vw);
  height: 440px;
  background: radial-gradient(58% 62% at 62% 40%, rgba(216, 169, 59, 0.18), rgba(216, 169, 59, 0) 72%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: flex;
  flex-direction: column;
}

.page-about .about-hero__marker {
  margin: 26px 0 0;
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 8.4vw, 3.25rem);
  line-height: 1.14;
  letter-spacing: -0.012em;
  overflow-wrap: break-word;
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-hero__text {
  margin: 14px 0 0;
  max-width: 36em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-muted);
}

.page-about .about-stats,
.page-about .about-team__counts {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.page-about .about-stat {
  border-top: 1px solid var(--line-strong);
  padding-top: 12px;
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.625rem;
  line-height: 1.15;
  color: var(--c-gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-muted);
}

/* ---------- 主体分栏 ---------- */
.page-about .about-body {
  padding-bottom: 76px;
}

.page-about .about-body__rail {
  margin-bottom: 40px;
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--c-mist);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 14px;
}

.page-about .about-toc__link {
  display: block;
  padding: 8px 0 8px 12px;
  border-left: 2px solid var(--line);
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.25s var(--ease-tide), border-color 0.25s var(--ease-tide);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--c-gold-soft);
  border-left-color: var(--c-gold);
}

.page-about .about-toc__link:focus-visible {
  outline: 2px solid var(--c-gold-soft);
  outline-offset: 2px;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  scroll-margin-top: 108px;
}

.page-about .about-section + .about-section {
  margin-top: 46px;
  padding-top: 42px;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 14px;
}

.page-about .about-chapter::after {
  content: "";
  flex: 1 1 auto;
  min-width: 24px;
  height: 1px;
  background: linear-gradient(90deg, var(--c-gold), rgba(216, 169, 59, 0));
}

.page-about .about-chapter__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--c-gold);
  white-space: nowrap;
}

.page-about .about-section .section-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 6vw, 2.125rem);
  line-height: 1.26;
  letter-spacing: -0.006em;
  color: var(--text);
}

.page-about .about-text {
  max-width: 38em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-muted);
}

.page-about .about-text + .about-text {
  margin-top: 14px;
}

.page-about .about-text:first-of-type {
  margin-top: 0;
}

.page-about .about-inline-link {
  color: var(--c-gold-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(216, 169, 59, 0.45);
  transition: border-color 0.25s var(--ease-tide), color 0.25s var(--ease-tide);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--c-gold);
  border-bottom-color: var(--c-gold);
}

.page-about .about-note {
  margin: 22px 0 0;
  padding: 14px 0 14px 18px;
  border-left: 2px solid var(--c-gold);
  max-width: 40em;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-muted);
}

/* ---------- 命名与叙事 ---------- */
.page-about .about-narrative {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 4px;
}

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

.page-about .about-narrative__media .media-frame__img,
.page-about .about-breath .media-frame__img,
.page-about .about-log__media .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-soft);
  object-fit: cover;
}

/* ---------- 四条主线 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-line {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-line__index {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  color: var(--c-gold);
}

.page-about .about-line__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-line__text {
  margin: 8px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .about-line__foot {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .about-breath {
  margin: 40px 0 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-team__group {
  padding: 18px 0 18px 20px;
  border-left: 2px solid var(--line-strong);
  transition: border-color 0.3s var(--ease-tide);
}

.page-about .about-team__group:hover,
.page-about .about-team__group:focus-within {
  border-left-color: var(--c-gold);
}

.page-about .about-team__name {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
}

.page-about .about-team__desc {
  margin: 8px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .about-team__counts {
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-flow__item {
  border-bottom: 1px solid var(--line);
}

.page-about .about-flow__summary {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 24px;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .about-flow__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-flow__summary:focus-visible {
  outline: 2px solid var(--c-gold-soft);
  outline-offset: 2px;
}

.page-about .about-flow__num {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--c-gold);
}

.page-about .about-flow__name {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
}

.page-about .about-flow__toggle {
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1;
  color: var(--c-gold);
  transition: transform 0.3s var(--ease-tide);
}

.page-about .about-flow__step[open] .about-flow__toggle {
  transform: rotate(45deg);
}

.page-about .about-flow__body {
  padding: 0 0 22px;
}

.page-about .about-flow__role {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .about-flow__check {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-flow__check li {
  position: relative;
  padding-left: 20px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text-muted);
}

.page-about .about-flow__check li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 2px;
  background: var(--c-gold);
}

/* ---------- 沿革 ---------- */
.page-about .about-log {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 24px;
}

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

.page-about .about-log__tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .tabs__tab {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1;
  padding: 9px 14px;
  border-radius: var(--r-plate);
  cursor: pointer;
  transition: color 0.25s var(--ease-tide), background-color 0.25s var(--ease-tide);
}

.page-about .tabs__tab:hover {
  color: var(--c-gold-soft);
}

.page-about .tabs__tab[aria-selected="true"] {
  color: var(--c-deep);
  background: var(--c-gold);
}

.page-about .tabs__tab:focus-visible {
  outline: 2px solid var(--c-gold-soft);
  outline-offset: 2px;
}

.page-about .tabs__panel {
  padding-top: 22px;
}

.page-about .tabs__panel[hidden] {
  display: none;
}

.page-about .about-log__node {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--c-gold);
}

.page-about .about-log__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
  line-height: 1.45;
  color: var(--text);
}

.page-about .tabs__panel p:last-child {
  max-width: 36em;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--text-muted);
}

/* ---------- 边界 ---------- */
.page-about .about-boundary {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 24px;
}

.page-about .about-boundary__title {
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--c-mist);
}

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

.page-about .about-boundary__list li {
  position: relative;
  padding-left: 20px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .about-boundary__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 10px;
  height: 2px;
  background: var(--c-mist);
}

.page-about .about-boundary__col--do .about-boundary__list li::before {
  background: var(--c-gold);
}

/* ---------- 去向 ---------- */
.page-about .about-next {
  margin-top: 52px;
  padding-top: 30px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-next__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.4;
  color: var(--text);
}

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

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 56px 0 52px;
  }

  .page-about .about-flow__body {
    padding-left: 46px;
  }

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

@media (min-width: 780px) {
  .page-about .about-narrative {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-line {
    grid-template-columns: 84px minmax(0, 1fr) 150px;
    gap: 28px;
    align-items: start;
  }

  .page-about .about-line__foot {
    padding-top: 6px;
    text-align: right;
  }

  .page-about .about-team__group {
    display: grid;
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 26px;
    align-items: baseline;
    padding: 22px 0 22px 24px;
  }

  .page-about .about-team__desc {
    margin-top: 0;
  }

  .page-about .about-boundary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 40px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 68px 0 58px;
  }

  .page-about .about-body {
    display: flex;
    gap: 64px;
    padding-bottom: 96px;
  }

  .page-about .about-body__rail {
    flex: 0 0 var(--about-rail);
    margin-bottom: 0;
  }

  .page-about .about-body__main {
    flex: 1 1 auto;
    min-width: 0;
  }

  .page-about .about-toc {
    position: sticky;
    top: var(--about-sticky-top);
  }

  .page-about .about-toc__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .page-about .about-log {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .about-stats,
  .page-about .about-team__counts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }
}
<<<END>>>