.page-about {
  --about-pad: clamp(44px, 7vw, 92px);
  --about-frame: clamp(20px, 3.4vw, 38px);
  --about-rule: rgba(200, 162, 83, 0.2);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--f-body);
  line-height: 1.75;
  letter-spacing: 0.02em;
  overflow-x: hidden;
}

.page-about .section {
  padding-block: var(--about-pad);
  border-top: 1px solid var(--line);
}

.page-about .section__lead {
  max-width: 66ch;
  color: var(--cool);
}

.page-about .about-crumb {
  padding-block: 18px 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cool);
}

.page-about .about-crumb a {
  color: var(--cool);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--gold-light);
  border-bottom-color: var(--gold);
}

.page-about .about-crumb .breadcrumb__sep {
  margin: 0 8px;
  color: var(--marble);
}

.page-about .about-crumb .breadcrumb__item {
  color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(24px, 4vw, 40px) clamp(32px, 5vw, 56px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

.page-about .about-hero__frame {
  position: relative;
  padding: var(--about-frame) var(--about-frame) calc(var(--about-frame) + 16px);
  border: 1px solid var(--marble);
  background: linear-gradient(160deg, var(--ink-2) 0%, var(--ink) 72%);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid var(--about-rule);
  pointer-events: none;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 26px;
  height: 26px;
  border-top: 2px solid var(--gold);
  border-left: 2px solid var(--gold);
}

.page-about .about-hero__title {
  position: relative;
  margin: 14px 0 18px;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(30px, 7vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  position: relative;
  max-width: 62ch;
  margin: 0;
  color: var(--cool);
  font-size: 16px;
}

.page-about .about-hero__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__facts {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--marble);
  border-left: 2px solid var(--gold);
  background: var(--ink-2);
}

.page-about .about-hero__facts-label {
  margin: 0 0 14px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

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

.page-about .fact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--marble);
}

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

.page-about .fact-row dt {
  font-size: 13px;
  color: var(--cool);
  letter-spacing: 0.06em;
}

.page-about .fact-row dd {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 14px;
  color: var(--gold-light);
  text-align: right;
}

/* ---------- 会馆做什么 ---------- */
.page-about .scope-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(26px, 4vw, 42px);
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .scope-item {
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink);
  transition: background var(--fast) var(--ease);
}

.page-about .scope-item:hover {
  background: var(--ink-2);
}

.page-about .scope-item__code {
  margin: 0 0 12px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .scope-item__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .scope-item__text {
  margin: 0;
  font-size: 15px;
  color: var(--cool);
}

/* ---------- 图片通用 ---------- */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
  overflow: hidden;
  border: 1px solid var(--marble);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.04);
}

.page-about .about-figure--team {
  margin-top: clamp(30px, 5vw, 52px);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 14px;
  bottom: 14px;
  left: 9px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(200, 162, 83, 0.12) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-left: 38px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 20px;
  width: 13px;
  height: 13px;
  background: var(--ink);
  border: 2px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .tl-node {
  border: 1px solid var(--marble);
  background: var(--ink-2);
  transition: border-color var(--fast) var(--ease), transform var(--fast) var(--ease);
}

.page-about .tl-node:hover {
  border-color: rgba(200, 162, 83, 0.6);
  transform: translateX(2px);
}

.page-about .tl-node[open] {
  border-color: rgba(200, 162, 83, 0.5);
}

.page-about .tl-node__summary {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 16px clamp(16px, 2.6vw, 24px);
  cursor: pointer;
  list-style: none;
}

.page-about .tl-node__summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-node__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--f-mono);
  font-size: 16px;
  color: var(--gold);
  transition: color var(--fast) var(--ease);
}

.page-about .tl-node[open] .tl-node__summary::after {
  content: "–";
  color: var(--cyan);
}

.page-about .tl-node__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .tl-node__year {
  font-family: var(--f-mono);
  font-size: 18px;
  letter-spacing: 0.06em;
  color: var(--gold-light);
}

.page-about .tl-node__title {
  font-size: 16px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .tl-node__body {
  padding: 0 clamp(16px, 2.6vw, 24px) 20px;
}

.page-about .tl-node__body p {
  margin: 0;
  font-size: 15px;
  color: var(--cool);
}

/* ---------- 团队分工 ---------- */
.page-about .member-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 28px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .member {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  background: var(--ink-2);
  border: 1px solid var(--marble);
  transition: border-color var(--fast) var(--ease);
}

.page-about .member::after {
  content: "";
  position: absolute;
  right: -6px;
  bottom: -6px;
  width: 58%;
  height: 42%;
  border-right: 1px solid rgba(46, 230, 214, 0.35);
  border-bottom: 1px solid rgba(46, 230, 214, 0.35);
  pointer-events: none;
  transition: border-color var(--fast) var(--ease);
}

.page-about .member:hover {
  border-color: rgba(200, 162, 83, 0.55);
}

.page-about .member:hover::after {
  border-color: var(--cyan);
}

.page-about .member__role {
  margin: 0 0 10px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .member__title {
  margin: 0 0 12px;
  font-size: clamp(19px, 3vw, 24px);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .member__text {
  margin: 0 0 16px;
  max-width: 58ch;
  font-size: 15px;
  color: var(--cool);
}

.page-about .member__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- 服务准则 ---------- */
.page-about .duty-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 38px);
  margin-top: clamp(26px, 4vw, 42px);
  align-items: start;
}

.page-about .about-figure--duty {
  margin: 0;
}

.page-about .duty-list {
  margin: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .duty-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .duty-row__key {
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .duty-row__val {
  margin: 0;
  font-size: 15px;
  color: var(--cool);
}

/* ---------- 合作与专题 ---------- */
.page-about .partner-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 36px);
  margin-top: clamp(26px, 4vw, 42px);
  align-items: start;
}

.page-about .partner-tracks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .track {
  padding: clamp(18px, 2.8vw, 24px);
  background: var(--ink);
}

.page-about .track__no {
  margin: 0 0 8px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .track__name {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .track__text {
  margin: 0;
  font-size: 14px;
  color: var(--cool);
}

.page-about .series-panel {
  padding: clamp(22px, 3.2vw, 32px);
  background: linear-gradient(170deg, var(--violet) 0%, #17112a 100%);
  border: 1px solid rgba(46, 230, 214, 0.18);
}

.page-about .series-panel .panel__label {
  margin: 0 0 10px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .series-panel__num {
  margin: 0;
  font-family: var(--f-mono);
  font-size: clamp(44px, 9vw, 68px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold-light);
}

.page-about .series-panel__lead {
  margin: 12px 0 20px;
  font-size: 15px;
  color: var(--cool);
}

.page-about .series-panel__list {
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .link-more {
  display: inline-block;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 230, 214, 0.4);
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-about .link-more:hover,
.page-about .link-more:focus-visible {
  color: var(--gold-light);
  border-bottom-color: var(--gold-light);
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestones {
  background: linear-gradient(150deg, var(--teal) 0%, #071f1f 78%);
  border-top: 1px solid rgba(46, 230, 214, 0.22);
}

.page-about .milestone-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(24px, 3.6vw, 38px);
  background: rgba(46, 230, 214, 0.16);
  border: 1px solid rgba(46, 230, 214, 0.16);
}

.page-about .milestone {
  padding: clamp(20px, 3vw, 28px);
  background: rgba(11, 11, 13, 0.72);
}

.page-about .milestone__num {
  margin: 0;
  font-family: var(--f-mono);
  font-size: clamp(30px, 6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--gold-light);
}

.page-about .milestone__suffix {
  font-size: 0.46em;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .milestone__unit {
  margin: 10px 0 8px;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .milestone__desc {
  margin: 0;
  font-size: 14px;
  color: var(--cool);
}

.page-about .honor-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(24px, 3.6vw, 36px);
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid rgba(200, 162, 83, 0.34);
  border-left: 3px solid var(--gold);
  background: rgba(11, 11, 13, 0.6);
}

.page-about .honor-block__year {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 26px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .honor-block__title {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 900;
  color: var(--paper);
}

.page-about .honor-block__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  color: var(--cool);
}

.page-about .honor-block__tag {
  margin: 0;
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  background: var(--ink-2);
}

.page-about .about-next__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  align-items: center;
}

.page-about .about-next__text .section__title {
  margin-top: 10px;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .scope-grid,
  .page-about .milestone-grid,
  .page-about .partner-tracks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .duty-row {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 8px 20px;
    align-items: baseline;
  }

  .page-about .honor-block {
    grid-template-columns: 110px minmax(0, 1fr) auto;
    align-items: center;
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .duty-layout,
  .page-about .partner-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(26px, 3.6vw, 44px);
  }

  .page-about .member-list {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 22px 24px;
  }

  .page-about .member:nth-child(odd) {
    grid-column: 1 / span 7;
  }

  .page-about .member:nth-child(even) {
    grid-column: 6 / span 7;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1120px) {
  .page-about .scope-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .partner-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}