.page-about {
  --about-line: rgba(160, 124, 51, .3);
  --about-tick: rgba(155, 166, 163, .34);
  --about-faint: rgba(155, 166, 163, .16);
  --about-gap: clamp(38px, 6.5vw, 84px);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-top: clamp(16px, 3vw, 28px);
}

/* ---------- 分卷封面 ---------- */
.page-about .cover {
  position: relative;
  padding: clamp(22px, 4vw, 42px) 0 clamp(30px, 5vw, 58px);
}

.page-about .cover::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 56px;
  height: 2px;
  background: var(--gold);
}

.page-about .cover-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .cover .title-lg {
  font-size: clamp(2.25rem, 5.6vw, 3.6rem);
  line-height: 1.14;
  margin: 14px 0 20px;
  letter-spacing: -.01em;
}

.page-about .cover .prose {
  margin: 0 0 16px;
  max-width: 64ch;
}

.page-about .cover .prose.lead {
  font-size: 1.06rem;
  color: var(--ivory);
}

/* 档案信息面板 */
.page-about .cover-facts {
  position: relative;
  padding: 18px 20px 6px;
  border: 1px solid var(--about-line);
  background:
    linear-gradient(158deg, rgba(63, 90, 69, .38) 0%, rgba(6, 15, 12, .78) 64%),
    var(--ink-green);
}

.page-about .cover-facts::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(201, 169, 92, .13);
  pointer-events: none;
}

.page-about .fact-list {
  margin: 0;
  padding: 0;
}

.page-about .fact-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--about-faint);
}

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

.page-about .fact-row dt {
  font-size: .8rem;
  letter-spacing: .06em;
  color: var(--silver);
}

.page-about .fact-row dd {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--gold-bright);
  text-align: right;
}

.page-about .fact-row .unit {
  font-family: var(--font-body);
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--silver);
}

/* ---------- 区块通用 ---------- */
.page-about .band {
  padding-block: var(--about-gap);
  border-top: 1px solid var(--about-faint);
}

.page-about .section-head {
  max-width: 66ch;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .section-head h2 {
  margin: 10px 0 14px;
}

.page-about .section-head .prose {
  margin: 0;
}

.page-about .band-note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--about-line);
  font-size: .88rem;
  line-height: 1.7;
  color: var(--silver);
  max-width: 74ch;
}

/* ---------- 沿革时间线 ---------- */
.page-about .tl-media {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 44px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg,
    var(--gold) 0%,
    rgba(160, 124, 51, .55) 55%,
    rgba(160, 124, 51, .08) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(24px, 3.4vw, 34px);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--ink-green);
  border: 1px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: -24px;
  top: 11px;
  width: 16px;
  height: 1px;
  background: var(--about-tick);
}

.page-about .tl-mark {
  display: inline-block;
  margin: 0 0 8px;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--gold-bright);
  border-bottom: 1px solid var(--about-line);
  padding-bottom: 4px;
  cursor: default;
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ivory);
}

.page-about .tl-text {
  margin: 0;
  max-width: 68ch;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--silver);
}

/* ---------- 六分类色卡 ---------- */
.page-about .cat-cards {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .cat-card {
  position: relative;
  padding: 16px 18px 18px;
  border: 1px solid var(--about-faint);
  border-left: 3px solid var(--stone);
  background: linear-gradient(152deg, rgba(69, 79, 76, .42) 0%, rgba(12, 26, 22, .18) 100%);
  transition:
    border-color var(--t-soft) var(--ease),
    background var(--t-soft) var(--ease);
}

.page-about .cat-card[data-cat="C-01"] { border-left-color: var(--gold); }
.page-about .cat-card[data-cat="C-02"] { border-left-color: var(--moss); }
.page-about .cat-card[data-cat="C-03"] { border-left-color: var(--stone); }
.page-about .cat-card[data-cat="C-04"] { border-left-color: var(--amber); }
.page-about .cat-card[data-cat="C-05"] { border-left-color: var(--moss); }
.page-about .cat-card[data-cat="C-06"] { border-left-color: var(--clay); }

.page-about .cat-card:hover {
  border-color: var(--gold-bright);
  background: linear-gradient(152deg, rgba(63, 90, 69, .55) 0%, rgba(12, 26, 22, .28) 100%);
}

.page-about .cat-code {
  display: block;
  margin-bottom: 10px;
  font-size: .95rem;
  letter-spacing: .1em;
  color: var(--gold-bright);
}

.page-about .cat-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ivory);
}

.page-about .cat-card p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 口径制度 ---------- */
.page-about .standard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 44px);
  align-items: start;
}

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

.page-about .rule-list li {
  position: relative;
  padding: 0 0 22px 56px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--about-faint);
}

.page-about .rule-list li:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.page-about .rule-idx {
  position: absolute;
  left: 0;
  top: 2px;
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .08em;
  color: var(--gold-bright);
  border: 1px solid var(--about-line);
}

.page-about .rule-list h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ivory);
}

.page-about .rule-list p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .standard-media {
  margin: 0;
}

/* 米白纸面引用块 */
.page-about .quote-paper {
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 20px 22px 22px;
  background: var(--paper);
  border-left: 4px solid var(--clay);
  box-shadow: 0 2px 0 var(--paper-shadow);
  color: var(--ink-green);
}

.page-about .quote-paper p {
  margin: 0 0 12px;
  font-size: .98rem;
  line-height: 1.78;
}

.page-about .quote-paper .quote-src {
  margin: 0;
  font-size: .76rem;
  letter-spacing: .08em;
  color: #6E6553;
}

/* 折叠复核记录 */
.page-about .fold {
  margin-top: 22px;
  border: 1px solid var(--about-line);
  background: rgba(6, 15, 12, .45);
}

.page-about .fold summary {
  cursor: pointer;
  list-style: none;
  padding: 14px 18px;
  font-size: .88rem;
  letter-spacing: .04em;
  color: var(--gold-bright);
  box-shadow: inset 3px 0 0 var(--gold);
  transition: background-color var(--t-soft) var(--ease), box-shadow var(--t-frame) var(--ease);
}

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

.page-about .fold summary:hover {
  background: rgba(63, 90, 69, .32);
  box-shadow: inset 5px 0 0 var(--gold-bright);
}

.page-about .fold summary:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: -2px;
}

.page-about .fold[open] summary {
  border-bottom: 1px solid var(--about-faint);
}

.page-about .fold-body {
  padding: 4px 0 10px;
}

.page-about .table-scroll {
  overflow-x: auto;
}

.page-about .review-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: .88rem;
}

.page-about .review-table caption {
  padding: 14px 18px 10px;
  text-align: left;
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--silver);
}

.page-about .review-table th,
.page-about .review-table td {
  padding: 10px 18px;
  text-align: left;
  border-top: 1px solid var(--about-faint);
}

.page-about .review-table th {
  font-weight: 500;
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--silver);
  white-space: nowrap;
}

.page-about .review-table td {
  color: var(--ivory);
}

.page-about .review-table td.num {
  color: var(--gold-bright);
}

/* ---------- 维护与节奏 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .team-card {
  padding: 18px 20px 20px;
  border-top: 2px solid var(--gold);
  background: linear-gradient(180deg, rgba(69, 79, 76, .38) 0%, rgba(12, 26, 22, .1) 100%);
}

.page-about .team-card h3 {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ivory);
}

.page-about .team-card p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.74;
  color: var(--silver);
}

.page-about .cadence-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-faint);
}

.page-about .cadence-list li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-faint);
}

.page-about .cadence-key {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .08em;
  color: var(--gold-bright);
  padding-top: 3px;
}

.page-about .cadence-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ivory);
}

.page-about .cadence-body p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.74;
  color: var(--silver);
}

/* ---------- 运营主体与备案 ---------- */
.page-about .band-operator {
  border-bottom: 1px solid var(--about-line);
  padding-bottom: calc(var(--about-gap) * 1.2);
}

.page-about .operator {
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--about-line);
  background: linear-gradient(158deg, rgba(63, 90, 69, .3) 0%, rgba(6, 15, 12, .55) 70%);
}

.page-about .operator h2 {
  margin: 10px 0 16px;
}

.page-about .operator .prose {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 68ch;
}

.page-about .op-list {
  margin: 0 0 clamp(20px, 3vw, 28px);
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--about-faint);
}

.page-about .op-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-faint);
}

.page-about .op-row dt {
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--silver);
}

.page-about .op-row dd {
  margin: 0;
  font-size: .96rem;
  line-height: 1.6;
  color: var(--ivory);
  word-break: break-word;
}

.page-about .op-row dd.num {
  color: var(--gold-bright);
}

.page-about .op-note {
  margin: 0 0 clamp(20px, 3vw, 28px);
  padding-left: 14px;
  border-left: 2px solid var(--clay);
  font-size: .86rem;
  line-height: 1.75;
  color: var(--silver);
  max-width: 72ch;
}

.page-about .op-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 0;
}

.page-about .text-link {
  display: inline-block;
  padding-bottom: 3px;
  font-size: .88rem;
  letter-spacing: .02em;
  color: var(--gold-bright);
  border-bottom: 1px solid var(--about-line);
  transition: border-color var(--t-soft) var(--ease), color var(--t-soft) var(--ease);
}

.page-about .text-link:hover {
  color: var(--ivory);
  border-bottom-color: var(--gold-bright);
}

.page-about .text-link:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: 2px;
}

/* ---------- 图片容器微调 ---------- */
.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--silver);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .cat-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .op-row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .cadence-list li {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 20px;
    padding: 18px 0;
  }
}

@media (min-width: 900px) {
  .page-about .cover-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(228px, .6fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .standard-grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
  }
}

@media (min-width: 1024px) {
  .page-about .cat-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (max-width: 380px) {
  .page-about .timeline {
    padding-left: 34px;
  }

  .page-about .timeline::before {
    left: 11px;
  }

  .page-about .tl-item::before {
    left: -28px;
  }

  .page-about .tl-item::after {
    display: none;
  }

  .page-about .rule-list li {
    padding-left: 0;
    padding-top: 32px;
  }

  .page-about .rule-idx {
    top: 0;
  }

  .page-about .cadence-list li {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .cat-card,
  .page-about .fold summary,
  .page-about .text-link {
    transition: none;
  }
}
</main>