.page-about {
  --about-line: rgba(140, 151, 184, 0.2);
  --about-line-strong: rgba(59, 232, 224, 0.38);
  --about-pad: 20px;
  padding: 0 var(--about-pad) 72px;
  background: var(--ink-800);
  color: var(--cloud);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about > * {
  max-width: var(--shell);
  margin-inline: auto;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding: 18px 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

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

.page-about .breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--slate);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  color: rgba(140, 151, 184, 0.45);
}

.page-about .breadcrumbs a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 20px 0 40px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 8px;
  right: -20px;
  width: 160px;
  height: 160px;
  background: linear-gradient(140deg, rgba(255, 61, 154, 0.26), rgba(59, 232, 224, 0) 68%);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  pointer-events: none;
}

.page-about .about-hero .label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-hero h1 {
  position: relative;
  margin: 14px 0 18px;
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(30px, 7.6vw, 62px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--cloud);
}

.page-about .about-hero__lead {
  max-width: 64ch;
  margin: 0 0 30px;
  font-size: 16px;
  line-height: 1.85;
  color: #c3cce2;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px 16px;
  background: var(--ink-700);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-hero__facts li:nth-child(2) .about-fact__num {
  color: var(--amber);
}

.page-about .about-hero__facts li:nth-child(3) .about-fact__num {
  color: var(--magenta);
}

.page-about .about-fact__key {
  font-size: 12px;
  line-height: 1.5;
  color: var(--slate);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: 44px 0 8px;
  border-bottom: 1px solid var(--about-line);
}

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

.page-about .about-section .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin-bottom: 14px;
}

.page-about .about-section .section-head .label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-section h2 {
  margin: 0;
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(22px, 5.2vw, 34px);
  line-height: 1.24;
  color: var(--cloud);
}

.page-about .about-section__lead {
  max-width: 66ch;
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.85;
  color: #b9c3da;
}

/* ---------- 图片容器 ---------- */
.page-about .about-media {
  position: relative;
  margin: 0 0 26px;
  line-height: 0;
  background: var(--ink-900);
  border: 1px solid rgba(59, 232, 224, 0.16);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  overflow: hidden;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-media--zones {
  border-color: rgba(180, 123, 255, 0.2);
}

.page-about .about-media--square {
  margin: 0;
  border-color: rgba(255, 184, 77, 0.2);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 4px 24px;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--magenta) 55%, var(--amber));
  opacity: 0.65;
}

.page-about .timeline__item {
  position: relative;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 21px;
  width: 9px;
  height: 9px;
  background: var(--ink-800);
  border: 2px solid var(--cyan);
  border-radius: 50%;
  z-index: 1;
}

.page-about .timeline__item:nth-child(3)::before,
.page-about .timeline__item:nth-child(4)::before {
  border-color: var(--magenta);
}

.page-about .timeline__item:nth-child(5)::before {
  border-color: var(--amber);
}

.page-about .timeline__node {
  position: relative;
  background: var(--ink-700);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  transition: background 180ms ease-out;
}

.page-about .timeline__node[open] {
  background: var(--ink-600);
}

.page-about .timeline__node > summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  outline-offset: -3px;
}

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

.page-about .timeline__node > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .timeline__node[open] > summary::after {
  content: "–";
  color: var(--amber);
}

.page-about .timeline__node > summary:focus-visible {
  outline: 2px solid var(--cyan);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .timeline__name {
  font-family: var(--font-cn);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cloud);
}

.page-about .timeline__body {
  padding: 0 20px 18px;
  border-top: 1px dashed rgba(140, 151, 184, 0.22);
  margin-top: 2px;
}

.page-about .timeline__body p {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.82;
  color: #b6c0d8;
}

/* ---------- 分区展签 ---------- */
.page-about .zone-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .zone-card {
  position: relative;
  padding: 22px 20px 18px;
  background: var(--ink-700);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: border-color 180ms ease-out, background 180ms ease-out;
}

.page-about .zone-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 36px;
  height: 4px;
  background: var(--zone-hue, var(--cyan));
}

.page-about .zone-card:nth-child(1) { --zone-hue: #3BE8E0; }
.page-about .zone-card:nth-child(2) { --zone-hue: #4FD1C5; }
.page-about .zone-card:nth-child(3) { --zone-hue: #7BD88F; }
.page-about .zone-card:nth-child(4) { --zone-hue: #C3E05A; }
.page-about .zone-card:nth-child(5) { --zone-hue: #FFD166; }
.page-about .zone-card:nth-child(6) { --zone-hue: #FFA94D; }
.page-about .zone-card:nth-child(7) { --zone-hue: #FF8A5B; }

.page-about .zone-card:hover,
.page-about .zone-card:focus-within {
  background: var(--ink-600);
  border-color: rgba(59, 232, 224, 0.35);
}

.page-about .zone-card__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--zone-hue, var(--cyan));
}

.page-about .zone-card__name {
  margin: 8px 0 10px;
  font-family: var(--font-cn);
  font-size: 18px;
  font-weight: 900;
  letter-spacing: 0.01em;
  color: var(--cloud);
}

.page-about .zone-card__desc {
  margin: 0 0 16px;
  font-size: 13.5px;
  line-height: 1.8;
  color: #b6c0d8;
}

.page-about .zone-card__group {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(140, 151, 184, 0.24);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
  opacity: 0.62;
  transition: opacity 180ms ease-out, color 180ms ease-out;
}

.page-about .zone-card:hover .zone-card__group,
.page-about .zone-card:focus-within .zone-card__group {
  opacity: 1;
  color: var(--amber);
}

/* ---------- 对照表 ---------- */
.page-about .zone-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  margin-bottom: 14px;
}

.page-about .zone-filter .label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .zone-filter__links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .zone-filter__links a {
  display: inline-block;
  padding: 5px 10px;
  font-size: 12.5px;
  line-height: 1.4;
  color: #c3cce2;
  text-decoration: none;
  background: var(--ink-700);
  border: 1px solid var(--about-line);
  transition: color 180ms ease-out, border-color 180ms ease-out, background 180ms ease-out;
}

.page-about .zone-filter__links a:hover,
.page-about .zone-filter__links a:focus-visible {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .table-scroll {
  border: 1px solid var(--about-line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .zone-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  font-size: 13px;
}

.page-about .zone-table caption {
  padding: 14px 16px;
  text-align: left;
  font-family: var(--font-cn);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--cloud);
  background: var(--ink-900);
  border-bottom: 1px solid var(--about-line);
}

.page-about .zone-table thead th {
  padding: 12px 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
  background: var(--ink-900);
  border-bottom: 1px solid var(--about-line-strong);
  white-space: nowrap;
}

.page-about .zone-table tbody th {
  padding: 13px 14px;
  text-align: left;
  vertical-align: top;
  font-family: var(--font-cn);
  font-size: 13px;
  font-weight: 700;
  color: var(--cloud);
  white-space: nowrap;
  border-bottom: 1px solid var(--about-line);
  border-left: 3px solid rgba(59, 232, 224, 0.28);
}

.page-about .zone-table tbody td {
  padding: 13px 14px;
  vertical-align: top;
  line-height: 1.7;
  color: #b6c0d8;
  border-bottom: 1px solid var(--about-line);
}

.page-about .zone-table tbody tr:last-child th,
.page-about .zone-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .zone-table tbody tr:hover th,
.page-about .zone-table tbody tr:hover td {
  background: rgba(59, 232, 224, 0.08);
}

.page-about .zone-table tbody tr:target th,
.page-about .zone-table tbody tr:target td {
  background: rgba(255, 184, 77, 0.16);
}

.page-about .zone-table tbody tr:target th {
  border-left-color: var(--amber);
  color: var(--amber);
}

/* ---------- 团队 ---------- */
.page-about .team-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .team-stats li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  padding: 14px 16px;
  background: var(--ink-700);
}

.page-about .team-stats__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--cyan);
}

.page-about .team-stats li:nth-child(2) .team-stats__num {
  color: var(--magenta);
}

.page-about .team-stats li:nth-child(3) .team-stats__num {
  color: var(--amber);
}

.page-about .team-stats li:nth-child(4) .team-stats__num {
  font-size: 17px;
  color: var(--cloud);
}

.page-about .team-stats__unit {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .team-stats__key {
  flex-basis: 100%;
  font-size: 12px;
  line-height: 1.55;
  color: var(--slate);
}

.page-about .team-note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid rgba(255, 61, 154, 0.5);
  font-size: 14px;
  line-height: 1.85;
  color: #b6c0d8;
}

/* ---------- 覆盖范围 ---------- */
.page-about .coverage-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .coverage-list li {
  padding: 22px 20px;
  background: var(--ink-700);
}

.page-about .coverage-list__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .coverage-list li:nth-child(2) .coverage-list__num {
  color: var(--magenta);
}

.page-about .coverage-list__name {
  margin: 10px 0 8px;
  font-family: var(--font-cn);
  font-size: 16px;
  font-weight: 900;
  color: var(--cloud);
}

.page-about .coverage-list p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: #b6c0d8;
}

.page-about .coverage-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: #b6c0d8;
}

/* ---------- 结构维护 ---------- */
.page-about .review-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: 24px 20px;
  background: var(--ink-700);
  border-left: 3px solid var(--amber);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .review-panel__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .review-panel__num span {
  margin-left: 6px;
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .review-panel__text {
  margin: 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.85;
  color: #b6c0d8;
}

/* ---------- 相关入口 ---------- */
.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .next-grid a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  text-decoration: none;
  background: var(--ink-700);
  border: 1px solid var(--about-line);
  transition: border-color 180ms ease-out, background 180ms ease-out, transform 180ms ease-out;
}

.page-about .next-grid a:hover,
.page-about .next-grid a:focus-visible {
  background: var(--ink-600);
  border-color: rgba(59, 232, 224, 0.42);
  transform: translateY(-2px);
}

.page-about .next-grid__k {
  font-family: var(--font-cn);
  font-size: 15px;
  font-weight: 900;
  color: var(--cyan);
}

.page-about .next-grid__v {
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about {
    --about-pad: 28px;
  }

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

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

  .page-about .coverage-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about {
    --about-pad: 40px;
    padding-bottom: 88px;
  }

  .page-about .about-hero {
    padding: 30px 0 48px;
  }

  .page-about .about-section {
    padding: 56px 0 12px;
  }

  .page-about .team-split {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
    gap: 36px;
  }

  .page-about .team-split .about-section__lead {
    max-width: 60ch;
  }

  .page-about .review-panel {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: start;
    gap: 28px;
    padding: 30px 34px;
  }

  .page-about .review-panel__num {
    font-size: 52px;
  }

  .page-about .timeline__node > summary {
    padding: 18px 26px;
  }

  .page-about .timeline__body {
    padding: 0 26px 20px;
  }
}

@media (min-width: 1120px) {
  .page-about .zone-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .next-grid a,
  .page-about .zone-card,
  .page-about .timeline__node {
    transition: none;
  }

  .page-about .next-grid a:hover,
  .page-about .next-grid a:focus-visible {
    transform: none;
  }
}