/* ===== page-about · 俱乐部档案 ===== */

.page-about {
  --about-stub: 26px;
  --about-rail: 2px;
  --about-terms-min: 340px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(18px, 3vw, 34px) clamp(40px, 5vw, 72px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  margin-top: clamp(18px, 3vw, 32px);
}

.page-about .about-hero__main h1 {
  margin: 10px 0 18px;
  font-size: clamp(30px, 4.8vw, 54px);
  line-height: 1.1;
  letter-spacing: 0.015em;
  font-weight: 900;
}

.page-about .about-hero__lede {
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
}

.page-about .about-fact {
  border: 2px solid var(--carbon);
  background: var(--green-deep);
  box-shadow: 4px 4px 0 var(--carbon);
  padding: 12px 14px 14px;
  display: grid;
  gap: 6px;
}

.page-about .about-fact dt {
  color: var(--concrete);
}

.page-about .about-fact__num {
  font-size: clamp(22px, 3.2vw, 40px);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  word-break: keep-all;
}

.page-about .about-fact__unit {
  font-size: 0.5em;
  margin-inline-start: 4px;
  color: var(--mist);
}

.page-about .about-hero__aside {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-hero__media {
  border: 2px solid var(--carbon);
  box-shadow: var(--shadow-hard);
  min-height: 220px;
}

.page-about .about-hero__stamp {
  color: var(--concrete);
  text-align: right;
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.85fr);
    align-items: stretch;
  }
  .page-about .about-hero__aside {
    grid-template-rows: 1fr auto;
  }
  .page-about .about-hero__media {
    min-height: 0;
  }
}

/* ---------- 时间轴 + 任期条 并列 ---------- */
.page-about .about-line__head {
  max-width: 62ch;
}

.page-about .about-pair {
  display: grid;
  gap: clamp(26px, 3.4vw, 44px);
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-pair__col {
  display: grid;
  gap: 14px;
  align-content: start;
  min-width: 0;
}

.page-about .about-pair__cap {
  color: var(--cyan);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 1024px) {
  .page-about .about-pair {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

/* --- 时间轴节点 --- */
.page-about .about-nodes {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 18px;
  display: grid;
  gap: 16px;
  position: relative;
}

.page-about .about-nodes::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 20px;
  bottom: 20px;
  width: 2px;
  background: linear-gradient(to bottom, var(--cyan), var(--teal) 45%, var(--concrete));
  opacity: 0.5;
}

.page-about .about-node {
  position: relative;
  border: 2px solid var(--carbon);
  background: var(--green-deep);
  box-shadow: 5px 5px 0 var(--carbon);
  padding: 14px 16px 16px;
  display: grid;
  gap: 8px;
  transition: translate 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 26px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--green-deep);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 240, 208, 0.12);
}

.page-about .about-node__idx {
  color: var(--concrete);
}

.page-about .about-node__year {
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-node__body h3 {
  font-size: 17px;
  margin: 0 0 6px;
  letter-spacing: 0.02em;
}

.page-about .about-node__body p {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-node:hover {
  translate: 0 -2px;
  box-shadow: 4px 4px 0 var(--carbon);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-node:hover {
    transition: none;
    translate: none;
  }
}

/* --- 任期条 --- */
.page-about .about-terms {
  display: grid;
  gap: 12px;
}

.page-about .about-terms__ruler {
  position: relative;
  height: 26px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-terms__ruler span {
  position: absolute;
  bottom: 6px;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--concrete);
  white-space: nowrap;
}

.page-about .about-terms__ruler span:nth-child(1) { left: 0; transform: none; }
.page-about .about-terms__ruler span:nth-child(2) { left: 26.7%; }
.page-about .about-terms__ruler span:nth-child(3) { left: 53.3%; }
.page-about .about-terms__ruler span:nth-child(4) { left: 80%; }
.page-about .about-terms__ruler span:nth-child(5) { left: 100%; transform: translateX(-100%); }

.page-about .about-terms {
  overflow-x: auto;
}

.page-about .about-terms__list {
  list-style: none;
  margin: 0;
  padding: 4px 0 0;
  display: grid;
  gap: 16px;
  min-width: var(--about-terms-min);
}

.page-about .about-term {
  display: grid;
  gap: 8px;
}

.page-about .about-term__track {
  position: relative;
  display: block;
  height: 34px;
}

.page-about .about-term__bar {
  position: absolute;
  inset-block: 0;
  display: grid;
  place-items: center;
  border: 2px solid var(--carbon);
  box-shadow: 3px 3px 0 var(--carbon);
  font-size: 11.5px;
  white-space: nowrap;
  padding-inline: 4px;
}

.page-about .about-term--a .about-term__bar {
  left: 0;
  width: 26.7%;
  background: var(--teal);
  color: #041B16;
}

.page-about .about-term--b .about-term__bar {
  left: 26.7%;
  width: 26.6%;
  background: var(--yellow);
  color: var(--carbon);
}

.page-about .about-term--c .about-term__bar {
  left: 53.3%;
  width: 26.7%;
  background: var(--red);
  color: #FFFFFF;
}

.page-about .about-term--d .about-term__bar {
  left: 80%;
  width: 20%;
  background: var(--cyan);
  color: var(--carbon);
}

.page-about .about-term__note {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-terms__legend {
  margin-top: 6px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

@media (min-width: 1024px) {
  .page-about .about-terms {
    overflow: visible;
  }
}

/* ---------- 章节里的图 ---------- */
.page-about .about-line__figure {
  margin: clamp(28px, 4vw, 46px) 0 0;
  border: 2px solid var(--carbon);
  box-shadow: var(--shadow-hard);
}

.page-about .about-line__figure .media__caption {
  padding: 10px 14px;
  color: var(--concrete);
  border-top: 1px solid var(--line);
}

.page-about .about-ladder__figure {
  margin: 0 0 clamp(22px, 3vw, 34px);
  border: 2px solid var(--carbon);
  box-shadow: var(--shadow-hard);
}

.page-about .about-ladder__figure .media__caption {
  padding: 10px 14px;
  color: var(--concrete);
  border-top: 1px solid var(--line);
}

/* ---------- 关键节点表格 ---------- */
.page-about .about-nodelist .section__head {
  max-width: 64ch;
}

.page-about .about-table-wrap {
  margin-top: clamp(20px, 3vw, 32px);
  overflow-x: auto;
  border: 2px solid var(--carbon);
  box-shadow: var(--shadow-hard);
  background: var(--green-deep);
}

.page-about .about-table {
  width: 100%;
  min-width: 700px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-table caption {
  text-align: left;
  padding: 12px 16px;
  color: var(--cyan);
  border-bottom: 1px solid var(--line);
}

.page-about .about-table thead th {
  background: var(--carbon);
  color: var(--paper);
  text-align: left;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  white-space: nowrap;
  font-weight: 500;
}

.page-about .about-table tbody th,
.page-about .about-table tbody td {
  padding: 14px 16px;
  border-top: 1px solid var(--line);
  color: var(--paper);
  vertical-align: top;
  text-align: left;
  font-weight: 400;
}

.page-about .about-table tbody th {
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-table tbody tr:nth-child(even) td,
.page-about .about-table tbody tr:nth-child(even) th {
  background: rgba(233, 231, 224, 0.03);
}

.page-about .about-table tbody tr:hover td,
.page-about .about-table tbody tr:hover th {
  background: rgba(53, 240, 208, 0.06);
}

/* ---------- 梯队 ---------- */
.page-about .about-ladder__grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

.page-about .about-ladder__col {
  border: 2px solid var(--carbon);
  background: var(--paper);
  color: var(--ink);
  box-shadow: 5px 5px 0 var(--carbon);
  padding: 16px 16px 18px;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-ladder__caption {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--carbon);
}

.page-about .about-ladder__age {
  font-size: clamp(26px, 3vw, 32px);
  line-height: 1;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-ladder__caption .mono-label {
  color: var(--ink);
  opacity: 0.66;
}

.page-about .about-ladder__list {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
}

.page-about .about-ladder__list dt {
  color: var(--teal);
  margin-top: 8px;
}

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

.page-about .about-ladder__list dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

@media (min-width: 640px) {
  .page-about .about-ladder__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-ladder__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 团队构成 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
}

.page-about .about-team__main h2 {
  margin: 10px 0 16px;
  color: var(--ink);
}

.page-about .about-team__main .prose {
  color: var(--ink);
}

.page-about .about-team__stats {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-team__stat {
  border: 2px solid var(--carbon);
  background: var(--carbon);
  color: var(--paper);
  padding: 14px 12px;
  display: grid;
  gap: 6px;
  box-shadow: 4px 4px 0 rgba(16, 19, 20, 0.25);
}

.page-about .about-team__num {
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__stat .mono-label {
  color: var(--mist);
}

.page-about .about-team__figure {
  margin: 0;
  border: 2px solid var(--carbon);
  box-shadow: var(--shadow-hard);
  align-self: start;
}

.page-about .about-team__figure .media__caption {
  padding: 10px 14px;
  color: var(--ink);
  background: var(--paper);
  border-top: 1px solid rgba(16, 19, 20, 0.16);
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }
}

/* ---------- 数据来源与访问 ---------- */
.page-about .about-source {
  padding-block: clamp(46px, 6vw, 84px);
}

.page-about .about-source h2 {
  margin: 10px 0 18px;
}

.page-about .about-source .prose + .prose {
  margin-top: 16px;
}

.page-about .about-source__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

@media (max-width: 560px) {
  .page-about .about-facts {
    grid-template-columns: 1fr;
  }
  .page-about .about-team__stats {
    grid-template-columns: 1fr;
  }
  .page-about .about-nodes {
    padding-left: 14px;
  }
  .page-about .about-node::before {
    left: -20px;
    width: 12px;
    height: 12px;
  }
  .page-about .about-source__actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}