.page-about {
  --about-rail: 176px;
  --about-tint: rgba(19, 28, 74, 0.72);
  background: linear-gradient(180deg, var(--ink-900) 0%, #0c1339 46%, var(--ink-900) 100%);
  color: var(--text);
  overflow-x: clip;
}

.page-about .about-crumbs {
  padding: 18px 0 2px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 12px;
  padding: 34px 0 46px;
  background: linear-gradient(155deg, var(--ink-800) 0%, var(--ink-900) 72%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -10%;
  width: 64%;
  height: 156%;
  background: linear-gradient(118deg, rgba(55, 224, 214, 0.2), rgba(122, 75, 209, 0.16) 52%, rgba(255, 177, 60, 0.1));
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 76%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
}

.page-about .about-hero h1 {
  margin: 10px 0 0;
  font-size: clamp(27px, 6.4vw, 46px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .about-hero__lede {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stats {
  display: grid;
  margin: 0;
  border: 1px solid var(--line-strong);
  background: rgba(11, 18, 51, 0.72);
  box-shadow: var(--shadow-card);
}

.page-about .about-stats__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 16px;
  border-bottom: 1px dashed var(--line);
}

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

.page-about .about-stats dt {
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-stats dd {
  margin: 0;
  font-size: 15px;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

/* ---------- 主体分栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: 26px;
  padding-top: 40px;
}

.page-about .about-flow {
  min-width: 0;
}

.page-about .about-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px;
  border: 1px solid var(--line);
  background: var(--about-tint);
  border-radius: var(--radius);
}

.page-about .rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .rail__link .mono {
  font-size: 12px;
  letter-spacing: 0.12em;
}

.page-about .rail__link:hover {
  color: var(--text);
  background: rgba(232, 236, 251, 0.05);
}

.page-about .rail__link.is-active,
.page-about .rail__link[aria-current="location"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(55, 224, 214, 0.09);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-bottom: 46px;
}

.page-about .about-sec + .about-sec {
  padding-top: 40px;
  border-top: 1px solid var(--line);
}

.page-about .about-sec h2,
.page-about .about-history h2,
.page-about .about-review h2,
.page-about .about-join h2 {
  margin: 8px 0 0;
  font-size: clamp(22px, 4.6vw, 31px);
  line-height: 1.3;
  letter-spacing: -0.005em;
}

.page-about .about-sec__lede {
  margin: 14px 0 24px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 四组分工 ---------- */
.page-about .about-teams__grid {
  display: grid;
  gap: 24px;
}

.page-about .about-groups {
  display: grid;
  gap: 14px;
}

.page-about .about-group {
  position: relative;
  padding: 20px 18px 20px 22px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-group::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan);
}

.page-about .about-group:nth-of-type(2)::before {
  background: var(--amber);
}

.page-about .about-group:nth-of-type(3)::before {
  background: var(--violet);
}

.page-about .about-group:nth-of-type(4)::before {
  background: var(--teal);
}

.page-about .about-group__no {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-group h3 {
  margin: 10px 0 8px;
  font-size: 19px;
  line-height: 1.35;
}

.page-about .about-group p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-group .about-group__stat {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

@media (hover: hover) {
  .page-about .about-group:hover {
    transform: translate(-2px, -4px);
    box-shadow: var(--shadow-lift);
    border-color: var(--line-strong);
  }

  .page-about .about-group:hover .about-group__stat {
    color: var(--cyan);
  }
}

.page-about .about-teams__fig {
  margin: 0;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

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

/* ---------- 入库流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  border-left: 2px solid var(--line-strong);
}

.page-about .about-step {
  position: relative;
  padding: 0 0 26px 26px;
}

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

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 5px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--cyan);
  background: var(--ink-900);
  border-radius: 50%;
}

.page-about .about-step__no {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-step h3 {
  margin: 8px 0 6px;
  font-size: 19px;
  line-height: 1.35;
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

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

/* ---------- 校验 ---------- */
.page-about .about-verify__grid {
  display: grid;
  gap: 24px;
}

.page-about .about-verify__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-verify__list li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: rgba(30, 42, 107, 0.28);
}

.page-about .about-verify__list li:nth-child(2) {
  border-left-color: var(--amber);
}

.page-about .about-verify__list li:nth-child(3) {
  border-left-color: var(--violet);
}

.page-about .about-verify__list .mono {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

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

.page-about .about-verify__list li:nth-child(3) .mono {
  color: var(--violet);
}

.page-about .about-verify__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
}

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

.page-about .about-verify__fig {
  margin: 0;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

/* ---------- 权益响应 ---------- */
.page-about .about-service__stats {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-service__stats li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  box-shadow: var(--shadow-card);
}

.page-about .about-service__num {
  font-size: 26px;
  color: var(--cyan);
  letter-spacing: 0.04em;
  line-height: 1;
}

.page-about .about-service__label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
}

.page-about .about-service__text {
  margin: 0 0 16px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text);
}

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

/* ---------- 沿革 ---------- */
.page-about .about-history {
  padding: 52px 0 46px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(19, 28, 74, 0.55) 0%, rgba(11, 18, 51, 0) 100%);
}

.page-about .about-history__fig {
  margin: 0 0 30px;
  aspect-ratio: 8 / 3;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

.page-about .about-timeline {
  display: grid;
  gap: 14px;
}

.page-about .about-node {
  background: var(--ink-800);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-node__head {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 4px 10px;
  padding: 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-node__head::-webkit-details-marker {
  display: none;
}

.page-about .about-node__head::after {
  content: "展开";
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-node details[open] .about-node__head::after {
  content: "收起";
  color: var(--cyan);
}

.page-about .about-node__year {
  grid-column: 1;
  font-size: 22px;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

.page-about .about-node details[open] .about-node__year {
  color: var(--amber);
}

.page-about .about-node__title {
  grid-column: 1;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-node__body {
  margin: 0 16px;
  padding: 12px 0 16px;
  border-top: 1px dashed var(--line);
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-history__link {
  margin: 26px 0 0;
}

/* ---------- 季度复核 ---------- */
.page-about .about-review {
  padding: 46px 0 8px;
  border-top: 1px solid var(--line);
}

.page-about .about-review__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: review;
}

.page-about .about-review__list li {
  position: relative;
  padding: 18px 18px 18px 20px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  box-shadow: var(--shadow-card);
}

.page-about .about-review__list li::before {
  counter-increment: review;
  content: "R" counter(review, decimal-leading-zero);
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-review__list h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.4;
}

.page-about .about-review__list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--muted);
}

/* ---------- 参与 ---------- */
.page-about .about-join {
  padding: 48px 0 64px;
  border-top: 1px solid var(--line);
}

.page-about .about-join__grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-join__card {
  padding: 20px 18px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(30, 42, 107, 0.6) 0%, rgba(19, 28, 74, 0.9) 100%);
  box-shadow: var(--shadow-card);
}

.page-about .about-join__card h3 {
  margin: 14px 0 10px;
  font-size: 18px;
  line-height: 1.38;
}

.page-about .about-join__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-join__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 28px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-service__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-service__stats li {
    flex-direction: column;
    gap: 8px;
  }

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

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

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

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 46px 0 58px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(250px, 4fr);
    align-items: end;
    gap: 44px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 52px;
    padding-top: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
    align-self: start;
    flex-direction: column;
    flex-wrap: nowrap;
  }

  .page-about .rail__link {
    display: flex;
  }

  .page-about .about-teams__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
    gap: 28px;
  }

  .page-about .about-verify__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    align-items: start;
    gap: 30px;
  }

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

  .page-about .about-node:nth-child(even) {
    margin-top: 34px;
  }

  .page-about .about-join__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}