.page-about {
  --about-line: 1px solid var(--moss-700);
  --about-line-soft: 1px solid rgba(29, 58, 46, .7);
  --about-measure: 34em;
  background-color: var(--ink-900);
  color: var(--bone-100);
  padding-bottom: 80px;
}

/* ---------- 首屏 ---------- */
.page-about .about-head {
  display: grid;
  gap: 28px;
  padding: 28px 0 40px;
  border-bottom: var(--about-line);
}

.page-about .about-head .crumbs {
  font-size: 13px;
  color: var(--stone-300);
  margin-bottom: 20px;
}

.page-about .about-head .crumbs a {
  color: var(--stone-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-head .crumbs a:hover,
.page-about .about-head .crumbs a:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

.page-about .about-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 7.6vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  max-width: 20ch;
}

.page-about .about-lead {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  max-width: var(--about-measure);
  color: var(--bone-100);
}

.page-about .about-facts {
  border: var(--about-line);
  background-color: var(--ink-850);
  padding: 4px 16px;
}

.page-about .about-facts__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 14px;
  padding: 11px 0;
  border-bottom: var(--about-line-soft);
}

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

.page-about .about-facts__k {
  font-size: 13px;
  color: var(--stone-300);
}

.page-about .about-facts__v {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--stone-300);
  letter-spacing: 0.01em;
}

.page-about .about-facts__v--key {
  color: var(--cyan-400);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  padding-top: 36px;
}

.page-about .about-index {
  margin-bottom: 28px;
}

.page-about .toc__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--stone-500);
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: var(--about-line-soft);
}

.page-about .toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
}

.page-about .toc__link {
  display: inline-flex;
  gap: 8px;
  align-items: baseline;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone-500);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 8px;
}

.page-about .toc__link:hover,
.page-about .toc__link:focus-visible {
  color: var(--bone-100);
}

.page-about .toc__link[aria-current="true"],
.page-about .toc__link[aria-current="page"] {
  color: var(--cyan-400);
  border-left-color: var(--cyan-400);
}

.page-about .toc__num {
  font-size: 11px;
  color: var(--stone-500);
}

/* ---------- 面板 ---------- */
.page-about .panel {
  background-color: var(--ink-850);
  border: var(--about-line);
}

.page-about .panel__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 4px 12px;
  padding: 14px 16px;
  border-bottom: var(--about-line);
}

.page-about .panel__num {
  font-size: 12px;
  color: var(--cyan-400);
  letter-spacing: 0.06em;
}

.page-about .panel__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.4;
  letter-spacing: 0.01em;
  margin: 0;
  color: var(--bone-100);
}

.page-about .panel__meta {
  grid-column: 2 / 3;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--clay-600);
}

.page-about .panel__toggle {
  grid-row: 1 / span 2;
  grid-column: 3 / 4;
  align-self: center;
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  border: var(--about-line);
  border-radius: 0;
  color: var(--cyan-400);
  cursor: pointer;
  padding: 0;
}

.page-about .panel__toggle:hover,
.page-about .panel__toggle:focus-visible {
  border-color: var(--cyan-400);
}

.page-about .panel__toggle-icon {
  position: relative;
  width: 11px;
  height: 11px;
  display: block;
}

.page-about .panel__toggle-icon::before,
.page-about .panel__toggle-icon::after {
  content: "";
  position: absolute;
  background-color: currentColor;
}

.page-about .panel__toggle-icon::before {
  left: 0;
  top: 5px;
  width: 11px;
  height: 1px;
}

.page-about .panel__toggle-icon::after {
  left: 5px;
  top: 0;
  width: 1px;
  height: 11px;
}

.page-about .panel[data-collapsed] .panel__toggle-icon::after {
  display: none;
}

.page-about .panel[data-collapsed] .panel__body {
  display: none;
}

.page-about .panel__body {
  padding: 20px 16px 24px;
}

.page-about .panel__body > :first-child {
  margin-top: 0;
}

.page-about .prose {
  font-size: 0.95rem;
  line-height: 1.85;
  max-width: var(--about-measure);
  margin: 0 0 16px;
  color: var(--bone-100);
}

.page-about .prose a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 230, 200, .45);
}

.page-about .prose a:hover,
.page-about .prose a:focus-visible {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}

/* ---------- 开篇图文 ---------- */
.page-about .about-split {
  display: grid;
  gap: 20px;
  margin-bottom: 16px;
}

.page-about .about-figure,
.page-about .about-widefig,
.page-about .about-strip {
  margin: 0;
}

.page-about .about-figure img,
.page-about .about-widefig img,
.page-about .about-strip img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .about-caption {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--stone-500);
  line-height: 1.7;
}

.page-about .about-widefig {
  margin-top: 22px;
}

.page-about .about-strip {
  margin: 24px 0;
}

.page-about .about-next {
  font-size: 13px;
  line-height: 1.8;
  color: var(--stone-300);
  margin: 0 0 6px;
}

.page-about .about-next a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 230, 200, .45);
}

.page-about .about-next a:hover,
.page-about .about-next a:focus-visible {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}

/* ---------- 版本时间线横向带 ---------- */
.page-about .about-band {
  border-top: var(--about-line);
  border-bottom: var(--about-line);
  padding: 16px 0 20px;
  margin: 20px 0 8px;
  background-color: rgba(29, 58, 46, .18);
}

.page-about .about-band .band__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--stone-500);
  margin: 0 0 14px;
  text-transform: uppercase;
}

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

.page-about .tl__item {
  position: relative;
  padding: 0 0 18px 20px;
  border-left: var(--about-line);
  outline-offset: 3px;
}

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

.page-about .tl__dot {
  position: absolute;
  left: -4px;
  top: 6px;
  width: 7px;
  height: 7px;
  background-color: var(--cyan-800);
  border: 1px solid var(--cyan-400);
}

.page-about .tl__item--current .tl__dot {
  background-color: var(--cyan-400);
}

.page-about .tl__ver {
  display: block;
  font-size: 15px;
  color: var(--cyan-400);
  letter-spacing: 0.04em;
}

.page-about .tl__stage {
  display: block;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--clay-600);
  margin-top: 2px;
}

.page-about .tl__tip {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--stone-300);
  max-width: 26em;
}

.page-about .tl__item:hover .tl__tip,
.page-about .tl__item:focus-visible .tl__tip,
.page-about .tl__item:focus-within .tl__tip {
  color: var(--bone-100);
}

.page-about .tl__item:hover .tl__ver,
.page-about .tl__item:focus-visible .tl__ver {
  color: var(--orange-500);
}

/* ---------- 流程双列 ---------- */
.page-about .flow2 {
  display: grid;
  border: var(--about-line);
  margin: 20px 0;
}

.page-about .flow2__col {
  padding: 16px 16px 18px;
}

.page-about .flow2__col + .flow2__col {
  border-top: var(--about-line);
}

.page-about .flow2__title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--bone-100);
}

.page-about .flow2__num {
  font-size: 11px;
  color: var(--orange-500);
  letter-spacing: 0.08em;
}

.page-about .flow2__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .flow2__list li {
  position: relative;
  padding: 7px 0 7px 14px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--stone-300);
  border-bottom: var(--about-line-soft);
}

.page-about .flow2__list li:last-child {
  border-bottom: 0;
}

.page-about .flow2__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 5px;
  height: 1px;
  background-color: var(--stone-500);
}

/* ---------- 旁注 ---------- */
.page-about .aside-note {
  font-size: 13px;
  line-height: 1.8;
  color: var(--stone-300);
  border-left: 2px solid var(--stone-500);
  padding: 2px 0 2px 14px;
  margin: 18px 0 0;
  max-width: var(--about-measure);
}

.page-about .aside-note--flag {
  border-left-color: var(--flag-500);
  color: var(--bone-100);
}

.page-about .aside-note a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 230, 200, .45);
}

.page-about .aside-note a:hover,
.page-about .aside-note a:focus-visible {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}

/* ---------- 分工表 ---------- */
.page-about .roster {
  overflow-x: auto;
  margin-bottom: 16px;
}

.page-about .roster .data-table {
  width: 100%;
  min-width: 420px;
  border-collapse: collapse;
  font-size: 13.5px;
}

.page-about .roster .data-table th,
.page-about .roster .data-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: var(--about-line-soft);
  line-height: 1.65;
}

.page-about .roster .data-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--stone-500);
  text-transform: uppercase;
  border-bottom: var(--about-line);
}

.page-about .roster .data-table tbody th {
  font-weight: 500;
  color: var(--bone-100);
  white-space: nowrap;
}

.page-about .roster .data-table td {
  color: var(--stone-300);
}

.page-about .roster .data-table .num {
  font-family: var(--font-mono);
  text-align: right;
  color: var(--cyan-400);
}

.page-about .roster .data-table tbody tr:hover td,
.page-about .roster .data-table tbody tr:hover th {
  background-color: rgba(29, 58, 46, .35);
}

/* ---------- 维护周历 ---------- */
.page-about .week {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  border: var(--about-line);
  margin: 20px 0;
}

.page-about .week__day {
  padding: 12px 4px;
  text-align: center;
  border-left: var(--about-line-soft);
}

.page-about .week__day:first-child {
  border-left: 0;
}

.page-about .week__day--maintenance {
  background-color: rgba(46, 230, 200, .07);
}

.page-about .week__name {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--stone-300);
}

.page-about .week__tag {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  line-height: 1.5;
  color: var(--stone-500);
}

.page-about .week__day--maintenance .week__tag {
  color: var(--cyan-400);
}

/* ---------- 桌面 ---------- */
@media (min-width: 861px) {
  .page-about .about-head {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 40px;
    padding: 44px 0 52px;
  }

  .page-about .about-body {
    padding-top: 48px;
  }

  .page-about .about-index {
    margin-bottom: 0;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-about .toc__list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .toc__link {
    padding: 7px 0 7px 10px;
    width: 100%;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-figure {
    margin-top: 4px;
  }

  .page-about .about-widefig {
    max-width: 520px;
    margin: 26px 0 26px auto;
  }

  .page-about .about-strip {
    margin: 32px 0;
  }

  .page-about .about-band {
    padding: 20px 0 24px;
  }

  .page-about .tl {
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
    align-items: start;
  }

  .page-about .tl__item {
    border-left: 0;
    border-top: var(--about-line);
    padding: 24px 18px 0 0;
  }

  .page-about .tl__item:last-child {
    padding-bottom: 0;
    padding-right: 0;
  }

  .page-about .tl__dot {
    left: 0;
    top: -4px;
  }

  .page-about .tl__tip {
    max-width: 24em;
  }

  .page-about .flow2 {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .page-about .flow2__col + .flow2__col {
    border-top: 0;
    border-left: var(--about-line);
  }

  .page-about .panel__head {
    padding: 16px 22px;
  }

  .page-about .panel__body {
    padding: 26px 22px 30px;
  }

  .page-about .week__day {
    padding: 16px 6px;
  }

  .page-about .week__name {
    font-size: 12px;
  }

  .page-about .week__tag {
    font-size: 12px;
  }
}
</main>
<<<END>>>