.page-about {
  --about-axis: 20px;
  --about-cut: 14px;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 60px) 0 clamp(30px, 5vw, 56px);
  background:
    linear-gradient(128deg, rgba(255, 122, 26, 0.14) 0%, rgba(10, 26, 43, 0) 44%),
    linear-gradient(232deg, rgba(70, 211, 154, 0.10) 0%, rgba(10, 26, 43, 0) 52%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -46%;
  width: min(620px, 78%);
  height: 360px;
  background: linear-gradient(90deg, rgba(200, 50, 60, 0.20), rgba(107, 91, 168, 0.12));
  clip-path: polygon(14% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero .breadcrumbs {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-about .about-hero-copy h1 {
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 10px 0 18px;
  color: var(--snow);
}

.page-about .about-hero-copy .lead {
  max-width: 42ch;
  margin: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero-media {
  margin: 0;
}

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

/* ---------- 规模数据带 ---------- */
.page-about .about-strip {
  padding: 0 0 clamp(34px, 5vw, 62px);
}

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

.page-about .about-strip-item {
  background: var(--panel-soft);
  padding: 18px 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-top: 2px solid transparent;
}

.page-about .about-strip-item:nth-child(1) { border-top-color: var(--orange); }
.page-about .about-strip-item:nth-child(2) { border-top-color: var(--green); }
.page-about .about-strip-item:nth-child(3) { border-top-color: var(--gold); }
.page-about .about-strip-item:nth-child(4) { border-top-color: var(--violet); }

.page-about .strip-num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3.6vw, 2.15rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--snow);
}

.page-about .about-strip-item:nth-child(2) .strip-num,
.page-about .about-strip-item:nth-child(4) .strip-num {
  color: var(--green);
}

.page-about .strip-label {
  font-size: 0.84rem;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 起点 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  align-items: start;
}

.page-about .about-origin-copy h2 {
  margin-bottom: 16px;
}

.page-about .about-origin-copy p {
  margin: 0 0 14px;
}

.page-about .about-origin-link {
  font-size: 0.92rem;
  color: var(--mist);
}

.page-about .about-origin-link a {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px dashed rgba(255, 122, 26, 0.55);
}

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

.page-about .about-origin-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-origin-points li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 15px 16px;
  background: var(--panel-soft);
  border-left: 2px solid var(--orange);
  color: var(--snow);
  font-size: 0.94rem;
  line-height: 1.6;
}

.page-about .about-origin-points li:nth-child(2) { border-left-color: var(--green); }
.page-about .about-origin-points li:nth-child(3) { border-left-color: var(--saffron); }

.page-about .about-origin-points .mono {
  flex: none;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--gold);
  padding-top: 2px;
}

/* ---------- 时间线 ---------- */
.page-about .about-tl-figure {
  margin: 0 0 clamp(30px, 4.5vw, 52px);
}

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

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

.page-about .about-tl-list::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: var(--about-axis);
  width: 2px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--saffron) 52%, var(--maroon) 100%);
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 0 46px;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .about-tl-item:last-child {
  margin-bottom: 0;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  top: 20px;
  left: calc(var(--about-axis) - 6px);
  width: 14px;
  height: 14px;
  background: var(--orange);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px var(--ink);
}

.page-about .about-tl-item:nth-child(2)::before { background: var(--gold); }
.page-about .about-tl-item:nth-child(3)::before { background: var(--green); }
.page-about .about-tl-item:nth-child(4)::before { background: var(--saffron); }
.page-about .about-tl-item:nth-child(5)::before { background: var(--violet); }

.page-about .about-tl-year {
  display: inline-block;
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--green);
  margin-bottom: 8px;
}

.page-about .about-tl-item h3 {
  margin: 0 0 8px;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  color: var(--snow);
}

.page-about .about-tl-item p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--mist);
  max-width: 42ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: clamp(24px, 4vw, 42px);
  align-items: start;
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .about-team-copy h2 {
  margin-bottom: 16px;
}

.page-about .about-team-copy p {
  margin: 0 0 14px;
}

.page-about .about-team-stats {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
}

.page-about .about-team-stats li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-team-stats .mono {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--green);
}

.page-about .about-team-stats em {
  font-style: normal;
  font-size: 0.8rem;
  color: var(--mist);
}

.page-about .about-team-media {
  margin: 0;
}

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

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

.page-about .about-role-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
  padding: 18px 18px 20px;
  transition: transform var(--dur) ease, border-color var(--dur) ease;
}

.page-about .about-role-item:nth-child(2) { border-top-color: var(--green); }
.page-about .about-role-item:nth-child(3) { border-top-color: var(--violet); }
.page-about .about-role-item:nth-child(4) { border-top-color: var(--gold); }

.page-about .about-role-item:hover,
.page-about .about-role-item:focus-within {
  transform: translateY(-3px);
  border-color: var(--mist);
}

.page-about .about-role-item h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  color: var(--snow);
}

.page-about .about-role-item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage-grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 38px);
  align-items: start;
}

.page-about .about-map {
  position: relative;
  min-height: 316px;
  background:
    repeating-linear-gradient(0deg, var(--grid) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 46px),
    radial-gradient(ellipse at 32% 38%, rgba(70, 211, 154, 0.12), transparent 62%),
    radial-gradient(ellipse at 76% 74%, rgba(255, 122, 26, 0.10), transparent 58%),
    var(--panel-soft);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-map::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 120px;
  height: 3px;
  background: linear-gradient(90deg, var(--saffron), var(--orange));
}

.page-about .about-map-dot {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--snow);
  white-space: nowrap;
}

.page-about .about-map-dot::before {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(70, 211, 154, 0.16);
  transition: box-shadow var(--dur) ease, background var(--dur) ease;
}

.page-about .about-map-dot:hover::before {
  background: var(--orange);
  box-shadow: 0 0 0 7px rgba(255, 122, 26, 0.18);
}

.page-about .about-map-dot:nth-child(1) { left: 11%; top: 16%; }
.page-about .about-map-dot:nth-child(2) { left: 44%; top: 9%; }
.page-about .about-map-dot:nth-child(3) { left: 71%; top: 26%; }
.page-about .about-map-dot:nth-child(4) { left: 9%; top: 44%; }
.page-about .about-map-dot:nth-child(5) { left: 52%; top: 52%; }
.page-about .about-map-dot:nth-child(6) { left: 13%; top: 72%; }
.page-about .about-map-dot:nth-child(7) { left: 55%; top: 82%; }

.page-about .about-coverage-copy h3 {
  margin: 0 0 14px;
  font-size: clamp(1.1rem, 2.3vw, 1.35rem);
  color: var(--snow);
}

.page-about .about-coverage-copy p {
  margin: 0 0 14px;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-coverage-facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-coverage-facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 14px;
  background: var(--panel-soft);
  border-left: 2px solid var(--green-deep);
  font-size: 0.88rem;
  color: var(--snow);
}

.page-about .about-coverage-facts .mono {
  flex: none;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--green);
  min-width: 3.4em;
}

/* ---------- 视觉由来 ---------- */
.page-about .about-color-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-color-item {
  background: var(--panel-soft);
  border: 1px solid var(--line);
  padding: 0 0 16px;
  overflow: hidden;
}

.page-about .about-color-chip {
  display: block;
  height: 6px;
  margin-bottom: 14px;
  background: var(--chip-color, var(--orange));
}

.page-about .about-color-item h3 {
  margin: 0 14px 8px;
  font-size: 1rem;
  color: var(--snow);
}

.page-about .about-color-item p {
  margin: 0 14px;
  font-size: 0.86rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-color-ink { --chip-color: linear-gradient(90deg, #0A1A2B, #17395A); }
.page-about .about-color-orange { --chip-color: var(--orange); }
.page-about .about-color-green { --chip-color: var(--green); }
.page-about .about-color-saffron { --chip-color: var(--saffron); }
.page-about .about-color-maroon { --chip-color: var(--maroon); }

.page-about .about-color-ink { --chip-color: var(--line); }

.page-about .about-color-ribbon {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  height: 5px;
  margin-top: clamp(22px, 3vw, 34px);
  clip-path: polygon(0 0, 100% 0, 99.2% 100%, 0 100%);
}

.page-about .about-color-ribbon span:nth-child(1) { background: var(--orange); }
.page-about .about-color-ribbon span:nth-child(2) { background: var(--gold); }
.page-about .about-color-ribbon span:nth-child(3) { background: var(--green); }
.page-about .about-color-ribbon span:nth-child(4) { background: var(--saffron); }
.page-about .about-color-ribbon span:nth-child(5) { background: var(--violet); }

/* ---------- 合作与共建 ---------- */
.page-about .about-coop-grid {
  display: grid;
  gap: 14px;
}

.page-about .about-coop-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--violet);
  padding: 20px 18px 22px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-coop-card:nth-child(2) { border-left-color: var(--orange); }
.page-about .about-coop-card:nth-child(3) { border-left-color: var(--green); }

.page-about .about-coop-card h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  color: var(--snow);
}

.page-about .about-coop-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.74;
  color: var(--mist);
}

.page-about .about-coop-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

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

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

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

@media (min-width: 900px) {
  .page-about {
    --about-axis: 50%;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-split {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-team-grid {
    grid-template-columns: 5fr 7fr;
  }

  .page-about .about-coverage-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  /* 时间轴转为居中交替 */
  .page-about .about-tl-list::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .about-tl-item {
    width: 50%;
    padding: 0 52px 0 0;
    margin-left: 0;
  }

  .page-about .about-tl-item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 0 52px;
  }

  .page-about .about-tl-item::before {
    left: auto;
    right: -7px;
  }

  .page-about .about-tl-item:nth-child(even)::before {
    left: -7px;
    right: auto;
  }

  .page-about .about-tl-item p {
    max-width: 34ch;
  }
}

@media (min-width: 1080px) {
  .page-about .about-color-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

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