.page-about {
  --about-rail-min: minmax(0, 3fr);
  --about-gold-line: rgba(232, 184, 92, 0.6);
}

/* 面包屑下的呼吸 */
.page-about .breadcrumb {
  margin-bottom: 8px;
}

/* ============ 引言 ============ */
.page-about .about-intro {
  padding: 8px 0 56px;
}

.page-about .about-intro-grid {
  display: grid;
  gap: 30px;
}

.page-about .about-intro-main .display-title {
  margin: 12px 0 20px;
  font-size: clamp(34px, 7.4vw, 68px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.page-about .about-lede {
  max-width: 60ch;
  margin: 0;
  color: var(--paper);
  opacity: 0.86;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-rail {
  border-top: 1px solid var(--edge);
  padding-top: 18px;
}

.page-about .about-rail p {
  margin: 0 0 12px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-rail .rail-label {
  margin-bottom: 10px;
}

.page-about .about-rail-coord {
  margin-top: 18px;
  margin-bottom: 0;
  color: var(--neon);
  letter-spacing: 0.08em;
  font-size: 12px;
}

.page-about .about-shot {
  margin: 40px 0 0;
}

.page-about .about-shot .media-frame {
  aspect-ratio: 1.42 / 1;
}

.page-about .about-shot .media-frame img,
.page-about .tl-figure .media-frame img,
.page-about .process-shot .media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  max-width: 100%;
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ============ 通用章节 ============ */
.page-about .about-sec {
  padding: 56px 0;
}

.page-about .about-sec-head {
  max-width: 760px;
  margin-bottom: 34px;
}

.page-about .about-sec-head h2 {
  margin: 10px 0 0;
  font-size: clamp(25px, 4.2vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  font-weight: 800;
}

.page-about .about-sec-lede {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-sec--midtone {
  position: relative;
  background: linear-gradient(
    180deg,
    rgba(18, 34, 54, 0) 0%,
    rgba(18, 34, 54, 0.7) 10%,
    rgba(18, 34, 54, 0.7) 90%,
    rgba(18, 34, 54, 0) 100%
  );
}

.page-about .about-sec--midtone::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--edge-strong) 32%, rgba(55, 230, 212, 0.4) 100%);
  transform: rotate(-0.35deg);
  transform-origin: left center;
  pointer-events: none;
}

/* ============ 时间线 ============ */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(
    180deg,
    rgba(232, 184, 92, 0) 0%,
    var(--about-gold-line) 6%,
    var(--about-gold-line) 90%,
    rgba(232, 184, 92, 0) 100%
  );
}

.page-about .tl-item {
  position: relative;
  padding-left: 40px;
}

.page-about .tl-summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 13px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-summary::marker {
  content: "";
}

.page-about .tl-dot {
  position: absolute;
  left: -25px;
  top: 20px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(232, 184, 92, 0.14), 0 0 14px rgba(232, 184, 92, 0.45);
  transition: box-shadow 220ms var(--ease);
}

.page-about .tl-node[open] .tl-dot {
  box-shadow: 0 0 0 4px rgba(232, 184, 92, 0.2), 0 0 22px rgba(232, 184, 92, 0.7);
}

.page-about .tl-year {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .tl-title {
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
  transition: color 180ms var(--ease);
}

.page-about .tl-summary:hover .tl-title,
.page-about .tl-node[open] .tl-title {
  color: var(--neon);
}

.page-about .tl-body {
  padding: 0 0 20px;
  max-width: 64ch;
}

.page-about .tl-body p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .tl-body .note {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gold);
  opacity: 0.85;
}

.page-about .tl-item--media {
  padding-top: 6px;
  padding-bottom: 18px;
}

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

.page-about .tl-figure .media-frame {
  aspect-ratio: 1.6 / 1;
}

/* ============ 四个小组 ============ */
.page-about .team-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-about .team-block {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 18px 18px;
  min-height: 210px;
  transition: transform 220ms var(--ease), background-color 220ms var(--ease);
}

.page-about .team-block:hover,
.page-about .team-block:focus-within {
  transform: translateY(-4px);
  background-color: var(--ink-soft);
}

.page-about .team-idx {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .team-block h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.3;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-block > p:not(.team-idx):not(.team-out) {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .team-out {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--edge);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
  opacity: 0.58;
  transition: opacity 220ms var(--ease), color 220ms var(--ease);
}

.page-about .team-block:hover .team-out,
.page-about .team-block:focus-within .team-out {
  opacity: 1;
  color: var(--neon);
  text-shadow: 0 0 14px rgba(55, 230, 212, 0.45);
}

@media (hover: none) {
  .page-about .team-out {
    opacity: 1;
    color: var(--neon);
  }
}

/* ============ 房间分类 ============ */
.page-about .quad-grid {
  display: grid;
  gap: 28px;
}

.page-about .quad-figure {
  margin: 0;
  padding: 16px;
  background: var(--ink-mid);
  border: 1px solid var(--edge);
  clip-path: polygon(
    0 0,
    calc(100% - var(--cut)) 0,
    100% var(--cut),
    100% 100%,
    var(--cut) 100%,
    0 calc(100% - var(--cut))
  );
}

.page-about .quad-figure svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .q {
  fill: rgba(27, 49, 73, 0.5);
  stroke: var(--edge-strong);
  stroke-width: 1;
}

.page-about .q-b {
  fill: rgba(55, 230, 212, 0.07);
  stroke: rgba(55, 230, 212, 0.36);
}

.page-about .q-code {
  fill: var(--gold);
  font-family: var(--font-mono);
  font-size: 22px;
}

.page-about .q-name {
  fill: var(--paper);
  font-family: var(--font-body);
  font-size: 15px;
}

.page-about .q-range {
  fill: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about .q-hit-label {
  fill: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .q-hit-label.is-hot {
  fill: var(--neon);
}

.page-about .quad-notes p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .quad-notes .rail-label {
  margin: 22px 0 10px;
}

.page-about .coord-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr;
}

.page-about .coord {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 3px;
  width: 100%;
  padding: 10px 14px;
  background: transparent;
  border: 1px solid var(--edge);
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut-sm)), calc(100% - var(--cut-sm)) 100%, 0 100%);
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .coord:hover,
.page-about .coord:focus-visible {
  border-color: rgba(55, 230, 212, 0.5);
  background-color: rgba(55, 230, 212, 0.06);
}

.page-about .coord-code {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .coord-tip {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
  opacity: 0.6;
  transition: opacity 180ms var(--ease), color 180ms var(--ease);
}

.page-about .coord:hover .coord-tip,
.page-about .coord:focus-visible .coord-tip {
  opacity: 1;
  color: var(--neon);
}

.page-about .coord[data-copied] .coord-code {
  color: var(--paper);
}

/* ============ 维护流程 ============ */
.page-about .process-shot {
  margin: 0 0 30px;
}

.page-about .process-shot .media-frame {
  aspect-ratio: 1.5 / 1;
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}

.page-about .flow-item {
  border-top: 1px solid var(--edge);
  padding-top: 14px;
}

.page-about .flow-num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .flow-item h3 {
  margin: 7px 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .flow-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ============ 场外资料 ============ */
.page-about .partner-text p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .partner-text p:last-child {
  margin-bottom: 0;
}

.page-about .partner-text a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 230, 212, 0.35);
}

.page-about .partner-text a:hover {
  border-bottom-color: var(--neon);
}

.page-about .partner-facts {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--edge);
}

.page-about .fact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .fact-list li {
  padding-left: 14px;
  border-left: 1px solid rgba(232, 184, 92, 0.4);
}

.page-about .fact-num {
  display: block;
  font-size: 26px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--neon);
}

.page-about .fact-label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ============ 联系收束 ============ */
.page-about .about-close {
  border-top: 1px solid var(--edge);
  padding-bottom: 64px;
}

.page-about .close-grid {
  display: grid;
  gap: 28px;
}

.page-about .close-main h2 {
  margin: 10px 0 16px;
  font-size: clamp(25px, 4.2vw, 38px);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .close-main p {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .close-main a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 230, 212, 0.35);
}

.page-about .close-main a:hover {
  border-bottom-color: var(--neon);
}

.page-about .close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .close-card {
  padding: 22px 20px;
  background: var(--ink-mid);
  border: 1px solid var(--edge);
  clip-path: polygon(
    0 0,
    calc(100% - var(--cut)) 0,
    100% var(--cut),
    100% 100%,
    var(--cut) 100%,
    0 calc(100% - var(--cut))
  );
}

.page-about .close-card .rail-label {
  margin: 0 0 10px;
}

.page-about .close-mail {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--neon);
  word-break: break-all;
}

.page-about .close-dl {
  margin: 0 0 16px;
}

.page-about .close-row {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 12px;
  padding: 8px 0;
  border-top: 1px solid var(--edge);
}

.page-about .close-row dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  min-width: 68px;
}

.page-about .close-row dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .close-card .note {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
  opacity: 0.8;
}

/* ============ 平板 ============ */
@media (min-width: 620px) {
  .page-about .coord-list {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-shot .media-frame {
    aspect-ratio: 1.9 / 1;
  }

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ============ 桌面 ============ */
@media (min-width: 880px) {
  .page-about .about-intro {
    padding: 16px 0 72px;
  }

  .page-about .about-intro-grid {
    grid-template-columns: minmax(0, 7fr) var(--about-rail-min);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-rail {
    border-top: 0;
    border-left: 1px solid var(--edge);
    padding: 4px 0 0 26px;
    margin-top: 8px;
  }

  .page-about .about-shot {
    margin-top: 48px;
  }

  .page-about .about-shot .media-frame {
    aspect-ratio: 2.35 / 1;
  }

  .page-about .about-sec {
    padding: 88px 0;
  }

  .page-about .about-sec-head {
    margin-bottom: 44px;
  }

  .page-about .tl-item {
    padding-left: 56px;
  }

  .page-about .tl::before {
    left: 20px;
  }

  .page-about .tl-dot {
    left: -41px;
    top: 22px;
  }

  .page-about .tl-summary {
    padding: 16px 0;
  }

  .page-about .tl-title {
    font-size: 18px;
  }

  .page-about .tl-figure .media-frame {
    aspect-ratio: 2.1 / 1;
  }

  .page-about .team-grid {
    grid-template-columns: 1.15fr 1.35fr 0.95fr 1.05fr;
    align-items: stretch;
    gap: 14px;
  }

  .page-about .quad-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .partner-facts {
    margin-top: 0;
    padding-top: 0;
    border-top: 0;
  }

  .page-about .close-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-close {
    padding-bottom: 88px;
  }
}

/* ============ 动效降级 ============ */
@media (prefers-reduced-motion: reduce) {
  .page-about .team-block,
  .page-about .tl-title,
  .page-about .team-out,
  .page-about .coord,
  .page-about .coord-tip,
  .page-about .tl-dot {
    transition: none;
  }

  .page-about .team-block:hover,
  .page-about .team-block:focus-within {
    transform: none;
  }
}