.page-about {
  --about-cut: 34px;
  padding-bottom: 24px;
}

/* ===== 面包屑 ===== */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 22px 0 0;
  list-style: none;
  font-family: var(--font-mono, ui-monospace, monospace);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin: 0 10px;
  color: var(--line-2);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color .18s var(--ease);
}

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

.page-about .breadcrumb [aria-current="page"] {
  color: var(--lime);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(118deg, rgba(255, 61, 139, .12), transparent 48%),
    linear-gradient(0deg, rgba(11, 16, 32, .96), rgba(11, 16, 32, .72)),
    repeating-linear-gradient(90deg, rgba(42, 53, 96, .55) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(42, 53, 96, .55) 0 1px, transparent 1px 72px);
  background-color: var(--ink-0);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -40%;
  width: 62%;
  height: 150%;
  border-left: 1px solid rgba(53, 224, 214, .28);
  transform: rotate(14deg);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-hero-copy .lede {
  max-width: 34em;
  margin-top: 20px;
  color: var(--muted);
}

.page-about .about-hero-copy .cluster {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(.92) contrast(1.08);
}

/* ===== 通用章节头微调 ===== */
.page-about .section-head {
  max-width: 62em;
}

.page-about .section-sub {
  max-width: 56em;
}

/* ===== 01 我们做什么 ===== */
.page-about .what-grid {
  display: grid;
  gap: 1px;
  margin-top: 36px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .what-grid .card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 26px 22px 28px;
  background: var(--ink-0);
  border: 0;
  transition: background .2s var(--ease);
}

.page-about .what-grid .card:hover {
  background: var(--ink-1);
}

.page-about .what-grid .card-num {
  font-family: var(--font-mono, ui-monospace, monospace);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--magenta);
}

.page-about .what-grid .card-title {
  margin: 0;
  font-family: var(--font-display, serif);
  font-size: 26px;
  line-height: 1.3;
  color: var(--text);
}

.page-about .what-grid .card-body {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .what-grid .card-meta {
  margin: 4px 0 0;
  font-family: var(--font-mono, ui-monospace, monospace);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
}

/* ===== 02 时间轴与数据 ===== */
.page-about .track-grid {
  display: grid;
  gap: 44px;
  margin-top: 36px;
}

.page-about .track {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .track::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 40px;
  width: 1px;
  background: linear-gradient(180deg, var(--magenta), var(--cyan) 42%, var(--lime));
  opacity: .6;
}

.page-about .track-item {
  position: relative;
  padding-bottom: 34px;
}

.page-about .track-item:last-child {
  padding-bottom: 0;
}

.page-about .track-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--ink-0);
  border: 1px solid var(--line-2);
  transform: rotate(45deg);
  transition: background .3s var(--ease), border-color .3s var(--ease);
}

.page-about .track-item:hover::before {
  background: var(--magenta);
  border-color: var(--magenta);
}

.page-about .track-item[data-state="new"]::before {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 12px rgba(182, 255, 60, .7);
}

.page-about .track-date {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .track-title {
  margin: 0 0 8px;
  font-family: var(--font-display, serif);
  font-size: 21px;
  line-height: 1.4;
  color: var(--text);
}

.page-about .track-body {
  margin: 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .track-side {
  display: grid;
  gap: 1px;
  align-content: start;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .track-stat {
  display: grid;
  gap: 4px;
  padding: 18px 18px 20px;
  background: var(--ink-1);
}

.page-about .track-stat-num {
  font-size: 30px;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--lime);
}

.page-about .track-stat-label {
  font-size: 14px;
  color: var(--muted);
}

.page-about .track-side .copy-btn {
  padding: 14px 18px;
  background: var(--ink-0);
  border: 0;
  color: var(--amber);
  font: inherit;
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  transition: color .18s var(--ease), background .18s var(--ease);
}

.page-about .track-side .copy-btn:hover,
.page-about .track-side .copy-btn:focus-visible {
  background: var(--ink-1);
}

.page-about .track-side .copy-btn[data-copied] {
  color: var(--lime);
}

/* ===== 03 内容版图 ===== */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 32px 0 20px;
}

.page-about .filter-btn {
  padding: 9px 18px;
  background: transparent;
  border: 1px solid var(--line-2);
  color: var(--muted);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  transition: color .18s var(--ease), background .18s var(--ease), border-color .18s var(--ease);
}

.page-about .filter-btn:hover {
  color: var(--text);
  border-color: var(--cyan);
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink-0);
}

.page-about .map-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .map-item {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 18px 18px 20px;
  background: var(--ink-0);
  transition: background .18s var(--ease);
}

.page-about .map-item:hover {
  background: var(--ink-1);
}

.page-about .map-item[hidden] {
  display: none;
}

.page-about .map-idx {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--violet);
}

.page-about .map-name {
  margin: 0;
  font-family: var(--font-body, sans-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .map-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .filter-empty {
  margin: 18px 0 0;
  padding: 16px 18px;
  border: 1px dashed var(--line-2);
  color: var(--muted);
  font-size: 15px;
}

.page-about .map-figure {
  margin: 40px 0 0;
  border: 1px solid var(--line);
}

.page-about .map-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .map-figure .media-cap {
  display: block;
  padding: 14px 18px;
  background: var(--ink-1);
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .map-figure .media-cap b {
  color: var(--lime);
}

/* ===== 04 本地服务 ===== */
.page-about .local-grid {
  display: grid;
  gap: 32px;
  margin-top: 36px;
}

.page-about .local-figure {
  margin: 0;
  border: 1px solid var(--line-2);
  clip-path: polygon(0 0, 100% 0, 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .local-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  opacity: .88;
}

.page-about .local-figure .media-cap {
  display: block;
  padding: 14px 18px;
  background: var(--ink-1);
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .local-figure .media-cap b {
  color: var(--cyan);
}

.page-about .local-lede {
  margin: 0 0 24px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .local-services {
  display: grid;
  gap: 1px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .local-services li {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num title"
    "num body";
  gap: 2px 14px;
  padding: 18px;
  background: var(--ink-0);
}

.page-about .ls-num {
  grid-area: num;
  align-self: start;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--magenta);
}

.page-about .ls-title {
  grid-area: title;
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-about .ls-body {
  grid-area: body;
  margin: 4px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .local-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .local-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 214, .4);
}

.page-about .local-note a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ===== 05 团队 ===== */
.page-about .team-grid {
  display: grid;
  gap: 36px;
  margin-top: 36px;
}

.page-about .team-bars {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .team-bars li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 16px;
  padding: 16px 2px 18px;
  border-bottom: 1px solid var(--line);
}

.page-about .team-name {
  font-size: 16px;
  color: var(--text);
}

.page-about .team-count {
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .team-bars li::after {
  content: "";
  grid-column: 1 / -1;
  height: 4px;
  width: var(--bar, 0%);
  background: linear-gradient(90deg, var(--cyan), var(--lime));
}

.page-about .team-notes {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about .team-note {
  padding-left: 16px;
  border-left: 2px solid var(--line-2);
}

.page-about .team-note-value {
  margin: 0 0 6px;
  font-size: 20px;
  letter-spacing: .04em;
  color: var(--amber);
}

.page-about .team-note-label {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ===== 06 段位 ===== */
.page-about .rank-list {
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .rank-list > li {
  border-bottom: 1px solid var(--line);
}

.page-about .rank-list .fold summary {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "idx name"
    "idx hint";
  gap: 4px 16px;
  padding: 18px 4px;
  cursor: pointer;
  list-style: none;
  transition: background .18s var(--ease);
}

.page-about .rank-list .fold summary::-webkit-details-marker {
  display: none;
}

.page-about .rank-list .fold summary:hover {
  background: var(--ink-1);
}

.page-about .rank-idx {
  grid-area: idx;
  align-self: center;
  min-width: 44px;
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--magenta);
}

.page-about .rank-name {
  grid-area: name;
  font-family: var(--font-display, serif);
  font-size: 20px;
  color: var(--text);
}

.page-about .rank-hint {
  grid-area: hint;
  font-size: 14px;
  color: var(--muted);
}

.page-about .rank-list .fold[open] .rank-hint {
  color: var(--cyan);
}

.page-about .rank-list .fold-body {
  padding: 0 4px 20px 60px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .rank-list .fold-body p {
  margin: 0 0 8px;
}

.page-about .rank-list .fold-body p:last-child {
  margin-bottom: 0;
}

.page-about .rank-list .fold-body strong {
  color: var(--text);
  font-weight: 600;
}

/* ===== 07 合作 ===== */
.page-about .coop-block {
  position: relative;
  margin-top: 8px;
  padding: 34px 24px 36px;
  background:
    linear-gradient(160deg, rgba(138, 107, 255, .14), transparent 62%),
    var(--ink-1);
  border: 1px solid var(--line-2);
}

.page-about .coop-block::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 120px;
  height: 3px;
  background: linear-gradient(90deg, var(--amber), transparent);
}

.page-about .coop-body {
  display: grid;
  gap: 18px;
  max-width: 62em;
  margin-top: 22px;
}

.page-about .coop-body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .coop-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .page-about .map-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 52px;
  }

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

  .page-about .local-grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 52px;
  }

  .page-about .coop-block {
    padding: 44px 44px 48px;
  }
}

@media (min-width: 1000px) {
  .page-about .map-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .track-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .track-side {
    position: sticky;
    top: 96px;
  }
}

@media (min-width: 1200px) {
  .page-about .map-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::after {
    transform: none;
  }

  .page-about .track-item::before,
  .page-about .filter-btn,
  .page-about .map-item,
  .page-about .what-grid .card {
    transition: none;
  }
}

.page-about {
  --bar: 1rem;
}