.page-about {
  --about-text: #AAB2BA;
  --about-dim: #828A92;
  overflow-wrap: break-word;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  overflow-wrap: break-word;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(2rem, 6vw, 4.25rem) 0 clamp(2.5rem, 7vw, 5.5rem);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -8rem;
  bottom: -9rem;
  width: min(34rem, 80vw);
  height: 22rem;
  background: radial-gradient(closest-side, rgba(46, 211, 206, 0.13), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(2.15rem, 7vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0.7rem 0 1.15rem;
  max-width: 19ch;
}

.page-about .about-hero__lede {
  max-width: 62ch;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(2rem, 5vw, 3.25rem) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  background: var(--ink);
  padding: 1rem 1.05rem 1.15rem;
}

.page-about .about-stat dt {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--gray);
  margin-bottom: 0.5rem;
}

.page-about .about-stat dd {
  margin: 0;
  font-size: clamp(1.3rem, 4vw, 1.85rem);
  font-weight: 700;
  color: var(--cyan);
  line-height: 1.2;
}

/* ---------- 01 买家关心什么 ---------- */

.page-about .about-issues__lede {
  max-width: 64ch;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-issues__grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-issue {
  background: var(--ink);
  padding: clamp(1.3rem, 3vw, 2rem) clamp(1.1rem, 3vw, 1.75rem);
  border-left: 2px solid transparent;
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-issue:hover {
  border-left-color: var(--orange);
  background: var(--graphite);
}

.page-about .about-issue__num {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--orange);
  margin-bottom: 0.9rem;
}

.page-about .about-issue__title {
  margin: 0 0 0.7rem;
  font-size: 1.05rem;
  line-height: 1.55;
  font-weight: 700;
  color: var(--silver);
}

.page-about .about-issue p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--about-text);
}

/* ---------- 02 规则沿革 ---------- */

.page-about .about-axis__lede {
  max-width: 64ch;
}

.page-about .about-axis__body {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

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

.page-about .about-stages {
  list-style: none;
  margin: 0;
  padding: 0 0 0 clamp(1.35rem, 3.5vw, 2rem);
  border-left: 1px solid var(--line);
}

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

.page-about .about-stage__item {
  border-bottom: 1px solid var(--line);
}

.page-about .about-stage__item > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.9rem;
  padding: 1.15rem 0;
  position: relative;
  transition: color 0.2s var(--ease);
}

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

.page-about .about-stage__item > summary::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(1.35rem, 3.5vw, 2rem));
  top: 1.55rem;
  width: 9px;
  height: 9px;
  transform: translateX(-50%) rotate(45deg);
  background: var(--line);
  transition: background 0.2s var(--ease);
}

.page-about .about-stage__item[open] > summary::before {
  background: var(--orange);
}

.page-about .about-stage__item > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--gray);
}

.page-about .about-stage__item[open] > summary::after {
  content: "−";
  color: var(--orange);
}

.page-about .about-stage__year {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-stage__title {
  font-size: clamp(1.05rem, 2.6vw, 1.3rem);
  font-weight: 700;
  color: var(--silver);
}

.page-about .about-stage__panel {
  padding: 0 0 1.4rem;
  max-width: 58ch;
}

.page-about .about-stage__panel p {
  margin: 0 0 0.9rem;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--about-text);
}

.page-about .about-stage__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.page-about .about-stage__list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--about-dim);
}

.page-about .about-stage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-axis__band {
  margin: clamp(2rem, 5vw, 3.5rem) 0 0;
  border: 1px solid var(--line);
  background: var(--ink);
}

.page-about .about-axis__band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 20 / 7;
  object-fit: cover;
}

.page-about .about-axis__band-cap {
  padding: 0.7rem 0.9rem;
  border-top: 1px solid var(--line);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--gray);
}

/* ---------- 03 产品体系 ---------- */

.page-about .about-series__lede {
  max-width: 64ch;
}

.page-about .about-series__list {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-series__row {
  display: grid;
  gap: 0.35rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-series__key {
  font-size: 0.73rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-series__name {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--silver);
}

.page-about .about-series__desc {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--about-text);
}

.page-about .about-series__note {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding: clamp(1.25rem, 3vw, 1.9rem);
  background: var(--graphite);
  clip-path: polygon(
    0 0,
    calc(100% - var(--radius-cut)) 0,
    100% var(--radius-cut),
    100% 100%,
    var(--radius-cut) 100%,
    0 calc(100% - var(--radius-cut))
  );
}

.page-about .about-series__note-title {
  margin: 0 0 0.7rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--silver);
}

.page-about .about-series__note p {
  margin: 0 0 1.15rem;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--about-text);
  max-width: 62ch;
}

/* ---------- 04 数据来源 ---------- */

.page-about .about-records {
  background: var(--mist);
  color: var(--ink);
}

.page-about .about-records .eyebrow {
  color: var(--gray);
}

.page-about .about-records .display-2 {
  color: var(--ink);
}

.page-about .about-records__lede {
  color: #414850;
  max-width: 64ch;
}

.page-about .about-records__body {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-records__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid #D5DAE0;
}

.page-about .about-record {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: 0.35rem 1rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid #D5DAE0;
}

.page-about .about-record__idx {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  padding-top: 0.28rem;
  color: var(--cyan-deep);
}

.page-about .about-record__title {
  margin: 0 0 0.4rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-record__text p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: #4A525A;
}

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

.page-about .about-records__more {
  margin: clamp(1.5rem, 3vw, 2rem) 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: #4A525A;
}

.page-about .about-records__more a {
  color: var(--cyan-deep);
  text-decoration: underline;
  text-underline-offset: 0.25em;
}

/* ---------- 05 服务网络 ---------- */

.page-about .about-network__lede {
  max-width: 64ch;
}

.page-about .about-network__body {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-network__title {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--silver);
}

.page-about .about-network__henan p {
  margin: 0 0 1.1rem;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--about-text);
  max-width: 60ch;
}

.page-about .about-network__cities {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
}

.page-about .about-network__city {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 0.8rem;
  background: var(--graphite);
  border-left: 2px solid var(--cyan);
  font-size: 0.88rem;
  color: var(--silver);
}

.page-about .about-network__city::before {
  content: "";
  width: 7px;
  height: 7px;
  flex: none;
  transform: rotate(45deg);
  background: var(--cyan-deep);
  border: 1px solid var(--cyan);
}

.page-about .about-network__hint {
  margin: 0 0 1.25rem;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--about-dim);
  max-width: 58ch;
}

.page-about .about-network__stats {
  display: grid;
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .about-network__stats > div {
  background: var(--ink);
  padding: 1rem 1.1rem 1.15rem;
}

.page-about .about-network__stats dt {
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  color: var(--gray);
  margin-bottom: 0.4rem;
}

.page-about .about-network__stats dd {
  margin: 0;
  font-size: clamp(1.3rem, 3.4vw, 1.65rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--orange);
}

/* ---------- 06 服务节奏 ---------- */

.page-about .about-pledge__lede {
  max-width: 64ch;
}

.page-about .about-pledge__grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-pledge__item {
  background: var(--ink);
  padding: clamp(1.2rem, 3vw, 1.7rem);
}

.page-about .about-pledge__item h3 {
  margin: 0 0 0.8rem;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--gray);
}

.page-about .about-pledge__num {
  margin: 0 0 0.65rem;
  font-size: clamp(1.35rem, 4vw, 1.8rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--orange);
}

.page-about .about-pledge__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .about-pledge__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-network__cities {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-pledge__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-series__row {
    grid-template-columns: 7rem minmax(9rem, 12rem) minmax(0, 1fr);
    align-items: baseline;
    gap: 1.5rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-issues__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-records__body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-network__body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-axis__body {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-pledge__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}