.page-about {
  --about-pad: clamp(52px, 7.5vw, 100px);
  --about-gap: clamp(16px, 2.4vw, 30px);
  --about-cut: 14px;
  background: var(--night);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  padding-top: clamp(16px, 2.6vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(18px, 3vw, 34px) 0 clamp(34px, 5vw, 58px);
  background:
    radial-gradient(120% 82% at 84% 0%, rgba(200, 255, 60, 0.10), transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(255, 92, 43, 0.07), transparent 60%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-about .about-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(31px, 6.6vw, 52px);
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--paper);
  margin: 14px 0 0;
}

.page-about .about-hero__copy .lead {
  margin-top: 16px;
  max-width: 46ch;
}

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

.page-about .about-hero__media {
  aspect-ratio: 4 / 3;
  background: var(--panel-2);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

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

/* ---------- 横向数据带 ---------- */
.page-about .data-strip.about-strip {
  margin-top: clamp(30px, 4.4vw, 52px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
  overflow: hidden;
}

.page-about .about-strip .data-strip__item {
  background: var(--panel);
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .about-strip .data-strip__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 4.4vw, 28px);
  color: var(--lime);
  line-height: 1.1;
}

.page-about .about-strip .data-strip__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding: var(--about-pad) 0;
}

.page-about .about-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 3.6vw, 42px);
}

.page-about .about-head .section-title {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  color: var(--paper);
}

.page-about .rule-slash {
  margin: 0;
}

/* ---------- 三根柱子 ---------- */
.page-about .about-pillars {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-pillar {
  padding: 24px 22px 26px;
  background: var(--panel);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-pillar__idx {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-pillar h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 23px);
  color: var(--paper);
  margin: 2px 0 0;
}

.page-about .about-pillar p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 岗位分工带 ---------- */
.page-about .about-filter {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-role {
  padding: 22px 20px 24px;
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--edge);
  border-top: 3px solid var(--lime);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: transform 180ms var(--ease-data), box-shadow 180ms linear;
}

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

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--lime);
  margin: 0 0 6px;
  letter-spacing: 0.02em;
}

.page-about .about-role h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .about-role p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text);
}

@media (hover: hover) {
  .page-about .about-role:hover {
    transform: translateY(-4px);
    box-shadow: 0 0 0 1px var(--lime-dim);
  }
}

/* ---------- 主场资料 ---------- */
.page-about .about-grounds {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 46px);
  align-items: start;
}

.page-about .about-grounds__media {
  aspect-ratio: 4 / 5;
  background: var(--panel-2);
  overflow: hidden;
  position: relative;
}

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

.page-about .about-grounds__body .section-title {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  color: var(--paper);
}

.page-about .about-grounds__body > p {
  font-size: 16.5px;
  line-height: 1.78;
  margin: 0;
}

.page-about .about-grounds__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  border-top: 1px dashed var(--edge);
  padding-top: 20px;
}

.page-about .about-grounds__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-grounds__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 9px;
  height: 9px;
  background: var(--lime);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}

.page-about .about-cities {
  margin-top: 24px;
}

.page-about .about-cities .accordion__item {
  border: 1px solid var(--edge);
  background: var(--panel-2);
}

.page-about .about-cities summary {
  padding: 14px 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--lime);
  cursor: pointer;
}

.page-about .about-cities__list {
  list-style: none;
  margin: 0;
  padding: 4px 18px 18px;
  display: grid;
  gap: 12px;
}

.page-about .about-cities__list li {
  padding-left: 14px;
  border-left: 2px solid var(--edge);
}

.page-about .about-cities__list span {
  display: block;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.04em;
}

.page-about .about-cities__list small {
  display: block;
  margin-top: 3px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-chart {
  width: 100%;
  height: auto;
  display: block;
  margin: 0 0 clamp(22px, 3.2vw, 34px);
}

.page-about .about-chart__line {
  stroke-dasharray: 900;
  stroke-dashoffset: 0;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: none;
}

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

.page-about .about-tl__item {
  border: 1px solid var(--edge);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: border-color 160ms linear;
}

.page-about .about-tl__item > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl__idx {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  color: var(--ink);
  background: var(--lime);
  padding: 4px 11px;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 84% 100%, 0 100%);
  white-space: nowrap;
}

.page-about .about-tl__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--paper);
  line-height: 1.3;
  min-width: 0;
}

.page-about .about-tl__body {
  padding: 0 18px 18px;
  border-top: 1px dashed var(--edge);
  margin-top: 2px;
  padding-top: 14px;
}

.page-about .about-tl__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text);
}

@media (hover: hover) {
  .page-about .about-tl__item:hover {
    border-color: var(--lime-dim);
  }
}

.page-about .about-tl__item[open] {
  border-color: var(--lime);
}

.page-about .about-tl__item[open] .about-tl__idx {
  background: var(--amber);
}

/* ---------- 线下与合作 ---------- */
.page-about .about-offline {
  align-items: center;
  gap: clamp(22px, 3.4vw, 42px);
}

.page-about .about-offline__media {
  aspect-ratio: 16 / 9;
  background: var(--panel-2);
  overflow: hidden;
  margin: 0;
}

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

.page-about .about-offline__body > p {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.78;
}

.page-about .about-offline__stats {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
}

.page-about .about-offline__stats .stat {
  background: var(--panel);
  padding: 16px 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 6px;
}

.page-about .about-offline__stats .stat__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 26px;
  color: var(--lime);
  line-height: 1.05;
}

.page-about .about-offline__stats .stat__unit {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--lime-dim);
}

.page-about .about-offline__stats .stat__label {
  flex: 0 0 100%;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: clamp(28px, 4.4vw, 52px);
  background: linear-gradient(120deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--edge);
  clip-path: polygon(0 0, calc(100% - 30px) 0, 100% 30px, 100% 100%, 30px 100%, 0 calc(100% - 30px));
}

.page-about .about-cta h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 36px);
  color: var(--paper);
  margin: 0 0 12px;
  line-height: 1.15;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.78;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .data-strip.about-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 768px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 4.6vw, 60px);
  }

  .page-about .about-grounds {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (min-width: 1080px) {
  .page-about .about-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-timeline {
    padding-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-tl__item {
    transition: none;
  }

  .page-about .about-chart__line {
    stroke-dasharray: none;
  }
}