/* ============================================================
   品牌文化页 · page-about
   作用域：全部选择器限定在 .page-about 内
   ============================================================ */

.page-about {
  --about-rail: 150px;
  --about-line: 1px solid var(--weave);
  --about-line-light: 1px solid rgba(244, 239, 230, .18);
  --about-ink-soft: #3A3A36;
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 面包屑外框 ---------- */
.page-about .about-crumb {
  padding-top: 20px;
}

/* ---------- 开篇声明 ---------- */
.page-about .about-open {
  padding: 26px 0 0;
}

.page-about .about-open-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-open-main {
  min-width: 0;
}

.page-about .about-title {
  margin: 10px 0 18px;
  font-size: clamp(30px, 7.4vw, 60px);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 900;
}

.page-about .about-lede {
  max-width: 62ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* 右侧信息卡：藏青底，金色等宽数字 */
.page-about .about-open-side {
  background: var(--navy);
  border: 1px solid var(--navy);
  border-top: 3px solid var(--flag-red);
  color: var(--paper);
  padding: 20px 20px 22px;
}

.page-about .about-side-label {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .about-side-list {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .about-side-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(244, 239, 230, .16);
}

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

.page-about .about-side-item dt {
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-side-item dd {
  margin: 0;
  font-size: 14px;
  color: var(--paper);
}

.page-about .about-side-item dd .mono {
  font-size: 19px;
  color: var(--gold);
  letter-spacing: -.01em;
}

.page-about .about-side-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(244, 239, 230, .7);
}

/* ---------- 通栏开篇图 + 半透明信息卡 ---------- */
.page-about .about-plate {
  position: relative;
  margin: 40px 0 0;
  border-top: var(--about-line);
  border-bottom: var(--about-line);
  background: var(--navy);
}

.page-about .about-plate-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-plate-card {
  position: relative;
  z-index: 2;
  margin: -34px 16px 0;
  padding: 18px 20px 20px;
  background: rgba(20, 49, 76, .92);
  border: 1px solid rgba(244, 239, 230, .22);
  color: var(--paper);
}

.page-about .about-plate-label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .about-plate-value {
  margin: 0 0 12px;
  font-size: 20px;
  color: var(--paper);
}

.page-about .about-plate-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(244, 239, 230, .82);
}

/* ---------- 通用区块标题 ---------- */
.page-about .about-head {
  max-width: 780px;
}

.page-about .about-head h2 {
  margin: 8px 0 14px;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.18;
  letter-spacing: -.018em;
  font-weight: 800;
}

.page-about .about-head-text {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-head-text a {
  color: var(--flag-red);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-head-text a:hover {
  color: var(--flag-red-deep);
}

/* ---------- 编年轴 ---------- */
.page-about .about-chronicle {
  padding: 68px 0 0;
}

.page-about .chronicle {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin: 28px 0 0;
  border: var(--about-line);
  background: var(--paper);
}

.page-about .chronicle-rail {
  display: flex;
  overflow-x: auto;
  border-bottom: var(--about-line);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .chronicle-tab {
  flex: 1 0 auto;
  min-width: 92px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 16px;
  border: 0;
  border-right: var(--about-line);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-mono);
  text-align: left;
  cursor: pointer;
  transition: background .18s ease, color .18s ease;
}

.page-about .chronicle-tab:last-child {
  border-right: 0;
}

.page-about .chronicle-tab:hover {
  background: rgba(217, 210, 197, .4);
  color: var(--navy);
}

.page-about .chronicle-tab[aria-selected="true"] {
  background: var(--navy);
  color: var(--paper);
}

.page-about .chronicle-tab-year {
  font-size: 16px;
  letter-spacing: .02em;
}

.page-about .chronicle-tab[aria-selected="true"] .chronicle-tab-year {
  color: var(--gold);
}

.page-about .chronicle-tab-note {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: .1em;
}

.page-about .chronicle-stage {
  padding: 26px 20px 30px;
  min-width: 0;
}

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

.page-about .chronicle-panel h3 {
  margin: 0 0 16px;
  font-size: clamp(20px, 3.6vw, 27px);
  font-weight: 800;
  letter-spacing: -.012em;
  line-height: 1.25;
}

.page-about .chronicle-panel p {
  margin: 0 0 22px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--about-ink-soft);
}

.page-about .chronicle-facts {
  margin: 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: var(--about-line);
  display: grid;
  gap: 10px;
}

.page-about .chronicle-facts li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

.page-about .chronicle-facts b {
  display: inline-block;
  min-width: 5.6em;
  margin-right: 12px;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--navy-soft);
}

/* 编年信息图 */
.page-about .chronicle-figure {
  margin: 26px 0 0;
  border: var(--about-line);
  background: var(--paper);
}

.page-about .chronicle-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .chronicle-figure .figure-caption {
  margin: 0;
  padding: 13px 16px;
  border-top: var(--about-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 六个固定栏目 ---------- */
.page-about .about-columns {
  padding: 76px 0 0;
}

.page-about .column-grid {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--weave);
  border: var(--about-line);
}

.page-about .column-card {
  position: relative;
  background: var(--paper);
  padding: 22px 20px 24px;
  transition: background .2s ease, color .2s ease;
}

.page-about .column-index {
  display: block;
  margin-bottom: 12px;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .column-name {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.012em;
}

.page-about .column-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .column-coord {
  margin: 18px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--weave);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
  transition: border-color .2s ease, color .2s ease;
}

.page-about .column-card:hover {
  background: var(--navy);
  color: var(--paper);
}

.page-about .column-card:hover .column-index {
  color: var(--gold);
}

.page-about .column-card:hover .column-desc {
  color: rgba(244, 239, 230, .82);
}

.page-about .column-card:hover .column-coord {
  border-top-color: rgba(244, 239, 230, .22);
  color: var(--gold);
}

/* ---------- 维护团队 ---------- */
.page-about .about-team {
  padding: 76px 0 0;
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .about-team-main {
  min-width: 0;
}

.page-about .team-list {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--weave);
  border: var(--about-line);
}

.page-about .team-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 18px 20px;
  background: var(--paper);
}

.page-about .team-num {
  padding-top: 3px;
  font-size: 14px;
  color: var(--flag-red);
  letter-spacing: .06em;
}

.page-about .team-body {
  min-width: 0;
}

.page-about .team-name {
  margin: 0 0 7px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .team-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .team-cross {
  margin: 20px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--jade);
  background: rgba(31, 138, 122, .07);
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-team-figure {
  margin: 0;
  border: var(--about-line);
  background: var(--paper);
  align-self: start;
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
}

.page-about .about-team-figure .figure-caption {
  margin: 0;
  padding: 13px 16px;
  border-top: var(--about-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 口径登记表 ---------- */
.page-about .about-ledger {
  padding: 76px 0 0;
}

.page-about .ledger-table {
  width: 100%;
  margin: 28px 0 0;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .ledger-table thead th {
  padding: 0 16px 10px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--mist);
  border-bottom: 1px solid var(--navy);
}

.page-about .ledger-table tbody th,
.page-about .ledger-table tbody td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: var(--about-line);
}

.page-about .ledger-table tbody th {
  font-weight: 600;
  color: var(--ink);
}

.page-about .ledger-table tbody td {
  color: var(--about-ink-soft);
  line-height: 1.6;
}

.page-about .ledger-table .ledger-value {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--flag-red);
  white-space: nowrap;
}

.page-about .ledger-table tbody th,
.page-about .ledger-table tbody tr:hover th,
.page-about .ledger-table tbody tr:hover td {
  transition: background .15s ease;
}

.page-about .ledger-table tbody tr:hover {
  background: rgba(217, 210, 197, .34);
}

.page-about .ledger-table a {
  color: var(--navy);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ledger-table a:hover {
  color: var(--flag-red);
}

/* ---------- 长期主张 ---------- */
.page-about .about-pledge {
  padding: 76px 0 84px;
}

.page-about .pledge-panel {
  position: relative;
  overflow: hidden;
  padding: 38px 22px 42px;
  background: var(--navy);
  border: 1px solid var(--navy);
  color: var(--paper);
}

.page-about .pledge-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--weave-flag);
  opacity: .45;
  pointer-events: none;
}

.page-about .pledge-panel > * {
  position: relative;
  z-index: 1;
}

.page-about .pledge-eyebrow {
  color: var(--gold);
}

.page-about .pledge-title {
  margin: 10px 0 18px;
  font-size: clamp(26px, 5.2vw, 44px);
  line-height: 1.12;
  letter-spacing: -.022em;
  font-weight: 900;
}

.page-about .pledge-text {
  margin: 0 0 30px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.82;
  color: rgba(244, 239, 230, .86);
}

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

.page-about .pledge-item {
  padding-top: 14px;
  border-top: 1px solid rgba(232, 179, 60, .42);
}

.page-about .pledge-item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--gold);
}

.page-about .pledge-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 239, 230, .78);
}

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

.page-about .pledge-actions .btn--ghost {
  border: 1px solid rgba(244, 239, 230, .45);
  color: var(--paper);
  background: transparent;
}

.page-about .pledge-actions .btn--ghost:hover {
  border-color: var(--gold);
  color: var(--gold);
}

/* ============================================================
   媒体查询
   ============================================================ */

/* 窄屏表格改为堆叠行，避免横向溢出 */
@media (max-width: 719px) {
  .page-about .ledger-table,
  .page-about .ledger-table tbody,
  .page-about .ledger-table tr,
  .page-about .ledger-table th,
  .page-about .ledger-table td {
    display: block;
    width: 100%;
  }

  .page-about .ledger-table thead {
    display: none;
  }

  .page-about .ledger-table tbody tr {
    border: var(--about-line);
    padding: 15px 16px 17px;
    margin-bottom: -1px;
  }

  .page-about .ledger-table tbody th {
    border: 0;
    padding: 0 0 6px;
    font-size: 15px;
  }

  .page-about .ledger-table tbody td {
    border: 0;
    padding: 0;
  }

  .page-about .ledger-table .ledger-value {
    display: inline-block;
    margin-bottom: 6px;
  }

  .page-about .chronicle-facts b {
    min-width: 0;
    margin-right: 10px;
  }
}

/* 平板：两列栏目格 */
@media (min-width: 560px) {
  .page-about .column-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

/* 中等屏：开篇图信息卡叠到右下角 */
@media (min-width: 860px) {
  .page-about .about-plate-img {
    aspect-ratio: 21 / 9;
  }

  .page-about .about-plate-card {
    position: absolute;
    right: clamp(24px, 6vw, 88px);
    bottom: 34px;
    width: min(400px, 42%);
    margin: 0;
    backdrop-filter: blur(3px);
  }

  .page-about .pledge-panel {
    padding: 54px 54px 58px;
  }

  .page-about .pledge-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
}

/* 桌面：编年轴改为左侧竖向刻度 */
@media (min-width: 900px) {
  .page-about .about-open {
    padding-top: 34px;
  }

  .page-about .about-open-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
    align-items: start;
  }

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

  .page-about .chronicle-rail {
    flex-direction: column;
    overflow: visible;
    border-bottom: 0;
    border-right: var(--about-line);
  }

  .page-about .chronicle-tab {
    min-width: 0;
    flex: 0 0 auto;
    padding: 20px 18px;
    border-right: 0;
    border-bottom: var(--about-line);
  }

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

  .page-about .chronicle-tab-year {
    font-size: 21px;
    letter-spacing: .01em;
  }

  .page-about .chronicle-stage {
    padding: 36px 38px 40px;
  }

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

/* 宽屏：团队区左右分置 */
@media (min-width: 960px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, .82fr);
    gap: 52px;
    align-items: start;
  }
}

/* 无障碍：减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about .column-card,
  .page-about .chronicle-tab,
  .page-about .column-coord {
    transition: none;
  }
}