.page-about {
  --about-rail: 248px;
  --about-radius: 0;
  padding-bottom: 72px;
  overflow-wrap: break-word;
}

/* 顶部上下文条 */
.page-about .about-context {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  padding-top: 26px;
}

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

.page-about .about-context__tag {
  margin: 0;
  padding: 6px 10px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold-soft);
  background: rgba(11, 36, 30, 0.72);
}

/* 骨架 */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  padding-top: 22px;
}

.page-about .about-stack {
  display: grid;
  gap: 24px;
  min-width: 0;
}

/* 左侧目录 */
.page-about .about-rail {
  align-self: start;
  padding: 18px 16px 20px;
  border: 2px solid var(--line);
  background: var(--felt);
  box-shadow: var(--shadow-soft);
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--sage);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 8px 8px 6px;
  border-left: 2px solid transparent;
  color: var(--cream);
  font-size: 14px;
  text-decoration: none;
  transition: background-color 160ms var(--ease), border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: var(--table);
  border-left-color: var(--orange);
  color: var(--gold-soft);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold);
}

.page-about .about-phases {
  padding-top: 14px;
  margin-bottom: 16px;
  border-top: 1px solid var(--line);
}

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

.page-about .about-phases__item {
  position: relative;
  padding-left: 16px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--sage);
}

.page-about .about-phases__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--table);
}

.page-about .about-phases__item--now::before {
  border-color: var(--orange);
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(240, 86, 46, 0.22);
}

.page-about .about-phases__code {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-soft);
}

.page-about .about-rail__cta {
  width: 100%;
  text-align: center;
}

/* 面板 */
.page-about .about-panel {
  --accent: var(--gold);
  padding: 22px 18px 26px;
  box-shadow: inset 5px 0 0 0 var(--accent), var(--shadow-hard);
}

.page-about .about-panel:nth-child(2) {
  --accent: var(--orange);
}

.page-about .about-panel:nth-child(3) {
  --accent: var(--gold-soft);
}

.page-about .about-panel:nth-child(4) {
  --accent: var(--focus);
}

.page-about .about-panel:nth-child(5) {
  --accent: var(--orange);
}

.page-about .about-panel:nth-child(6) {
  --accent: var(--gold);
}

.page-about .about-panel__head .section-title {
  margin-top: 6px;
}

.page-about .about-h1 {
  font-size: clamp(26px, 5.2vw, 40px);
  line-height: 1.26;
  letter-spacing: -0.02em;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* 01 品牌声明 */
.page-about .about-declaration {
  display: grid;
  gap: 20px;
  margin-top: 22px;
}

.page-about .about-declaration__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--cream);
}

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

.page-about .about-declaration__media,
.page-about .about-tags__media,
.page-about .about-teams__media {
  margin: 0;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-soft);
  background: var(--table);
}

.page-about .media-caption {
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--sage);
  border-top: 1px solid var(--line);
}

.page-about .about-stats {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-stat {
  padding: 12px 14px;
  border: 2px solid var(--line);
  border-top: 3px solid var(--gold);
  background: var(--table);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 500;
  line-height: 1.1;
  color: var(--gold-soft);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--sage);
}

/* 02 房间标签 */
.page-about .about-rule {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-rule__item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  border: 2px solid var(--line);
  border-left: 5px solid var(--gold);
  background: var(--table);
}

.page-about .about-rule__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-rule__item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--cream);
}

.page-about .about-tags__media {
  margin-top: 20px;
}

.page-about .about-filter {
  margin-top: 20px;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-filter-status {
  margin: 10px 0 0;
  min-height: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--sage);
}

.page-about .about-taggrid {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-tagcard {
  --sw: var(--gold);
  display: grid;
  grid-template-columns: 6px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 14px 14px 0;
  border: 2px solid var(--line);
  background: rgba(27, 77, 63, 0.62);
  transition: border-color 140ms var(--ease), background-color 140ms var(--ease);
}

.page-about .about-tagcard:hover {
  border-color: var(--gold);
  background: var(--table);
}

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

.page-about .about-tagcard--green {
  --sw: #2E7D62;
}

.page-about .about-tagcard--orange {
  --sw: var(--orange);
}

.page-about .about-tagcard--gold {
  --sw: var(--gold);
}

.page-about .about-tagcard__swatch {
  align-self: stretch;
  background: var(--sw);
}

.page-about .about-tagcard__body {
  min-width: 0;
}

.page-about .about-tagcard__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold-soft);
}

.page-about .about-tagcard__name {
  margin: 2px 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-tagcard__desc {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--sage);
}

/* 03 索引维护 */
.page-about .about-sheet {
  margin-top: 22px;
  padding: 18px 16px 20px;
  border: 2px solid var(--brown);
  background: var(--cream);
  box-shadow: var(--shadow-soft);
  color: var(--brown);
}

.page-about .about-sheet__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange-deep);
}

.page-about .about-sheet__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-sheet__item {
  padding-bottom: 14px;
  border-bottom: 1px dashed rgba(36, 26, 19, 0.28);
}

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

.page-about .about-sheet__when {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--brown);
  border: 1px solid rgba(36, 26, 19, 0.4);
  padding: 2px 8px;
}

.page-about .about-sheet__what {
  margin: 8px 0 4px;
  font-size: 15px;
  font-weight: 800;
  color: var(--brown);
  letter-spacing: -0.01em;
}

.page-about .about-sheet__item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: #4A3A2C;
}

.page-about .about-versions__label {
  margin: 24px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--sage);
}

.page-about .about-filter--versions {
  margin-top: 10px;
}

.page-about .about-versions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 14px;
}

.page-about .about-version {
  padding: 14px 16px;
  border: 2px solid var(--line);
  border-top: 4px solid var(--gold);
  background: var(--table);
}

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

.page-about .about-version__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--gold-soft);
}

.page-about .about-version__title {
  margin: 4px 0 6px;
  font-size: 14px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-version__desc {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--sage);
}

/* 04 团队 */
.page-about .about-teams {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-team {
  padding: 14px 16px;
  border: 2px solid var(--line);
  background: var(--table);
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 500;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-team__name {
  margin: 4px 0 6px;
  font-size: 14px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--sage);
}

.page-about .about-teams__media {
  margin-top: 20px;
}

/* 05 规模 */
.page-about .about-reach {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-reach__item {
  padding: 16px 18px;
  border: 2px solid var(--line);
  background: var(--table);
}

.page-about .about-reach__item--orange {
  background: var(--orange);
  border-color: var(--orange-deep);
}

.page-about .about-reach__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 7vw, 38px);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--gold-soft);
}

.page-about .about-reach__unit {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sage);
}

.page-about .about-reach__label {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--sage);
}

.page-about .about-reach__item--orange .about-reach__num {
  color: var(--brown);
}

.page-about .about-reach__item--orange .about-reach__unit {
  color: #4A1A08;
}

.page-about .about-reach__item--orange .about-reach__label {
  color: #4A1A08;
}

.page-about .about-reach__note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--cream);
}

/* 06 协作 */
.page-about .about-eco {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-eco__item {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-eco__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-eco__name {
  margin: 0 0 4px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-eco__item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--sage);
}

.page-about .about-link {
  color: var(--gold-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--orange);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

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

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

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

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

@media (min-width: 720px) {
  .page-about .about-shell {
    padding-top: 28px;
  }

  .page-about .about-panel {
    padding: 32px 32px 36px;
  }

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

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

  .page-about .about-sheet {
    padding: 22px 22px 24px;
  }
}

/* 桌面双栏与粘性目录 */
@media (min-width: 900px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
  }

  .page-about .about-stack {
    gap: 28px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-taggrid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .about-stack > .about-panel:nth-child(even) {
    margin-left: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-tagcard {
    transition: none;
  }
}
<<<END>>>