.page-about {
  --about-grid: 72px;
  --about-rail: 138px;
  background: var(--jz-paper);
  color: var(--jz-ink);
  overflow-x: hidden;
}

@media (max-width: 620px) {
  .page-about {
    --about-grid: 48px;
    --about-rail: 0px;
  }
}

.page-about .section {
  padding: clamp(38px, 6vw, 76px) 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 44px) 0 clamp(34px, 6vw, 68px);
  background-image:
    repeating-linear-gradient(90deg, var(--jz-line-soft) 0 1px, transparent 1px var(--about-grid)),
    repeating-linear-gradient(0deg, var(--jz-line-soft) 0 1px, transparent 1px var(--about-grid)),
    linear-gradient(180deg, var(--jz-paper) 0%, var(--jz-paper-2) 100%);
  border-bottom: 1px solid var(--jz-line);
}

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

.page-about .about-hero__tag {
  display: inline-block;
  margin: 20px 0 0;
  padding: 5px 13px;
  font-family: var(--font-head);
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--jz-red);
  background: rgba(244, 239, 230, .82);
  border: 1px solid var(--jz-line);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 62px);
  line-height: 1.14;
  letter-spacing: -.02em;
  max-width: 17em;
  color: var(--jz-deep);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 38em;
  font-size: clamp(15px, 1.65vw, 17.5px);
  line-height: 1.9;
  color: #3a3d3b;
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 0;
  background: var(--jz-line-soft);
  border-top: 1px solid var(--jz-line);
  border-bottom: 1px solid var(--jz-line);
}

@media (min-width: 760px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-hero__meta-item {
  background: var(--jz-paper);
  padding: 14px 16px 16px;
}

.page-about .about-hero__meta-item dt {
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--jz-gray);
}

.page-about .about-hero__meta-item dd {
  margin: 7px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(14.5px, 1.8vw, 18px);
  letter-spacing: .03em;
  color: var(--jz-deep);
}

/* ---------- 横幅图 ---------- */

.page-about .about-banner {
  margin: 0;
  border-bottom: 1px solid var(--jz-line);
  background: var(--jz-paper-2);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: clamp(170px, 32vw, 400px);
  object-fit: cover;
}

.page-about .about-banner__cap {
  margin: 0 auto;
  max-width: var(--shell);
  padding: 10px var(--pad);
  font-family: var(--font-head);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--jz-gray);
  background: var(--jz-paper);
  border-top: 1px solid var(--jz-line-soft);
}

/* ---------- 总览条带 ---------- */

.page-about .about-overview__head {
  align-items: flex-start;
}

.page-about .about-overview__grid {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--jz-line-soft);
  border: 1px solid var(--jz-line);
}

@media (min-width: 700px) {
  .page-about .about-overview__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-overview__grid {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }
}

.page-about .about-overview__grid > li {
  display: flex;
}

.page-about .about-overview__link {
  display: block;
  width: 100%;
  padding: 18px 14px 20px;
  background: var(--jz-paper);
  text-decoration: none;
  color: inherit;
  transition: background .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .about-overview__link:hover,
.page-about .about-overview__link:focus-visible {
  background: var(--jz-paper-2);
  box-shadow: inset 0 -3px 0 var(--jz-red);
  outline: none;
}

.page-about .about-overview__num {
  display: block;
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1;
  color: var(--jz-bronze);
  letter-spacing: -.02em;
}

.page-about .about-overview__name {
  display: block;
  margin-top: 14px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 15.5px;
  line-height: 1.42;
  letter-spacing: -.01em;
  color: var(--jz-deep);
}

.page-about .about-overview__years {
  display: block;
  margin-top: 9px;
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--jz-gray);
}

/* ---------- 时间轴图谱 ---------- */

.page-about .about-track__figure {
  margin: 34px auto 0;
  max-width: 350px;
}

.page-about .about-track__figure .figure__frame {
  border: 1px solid var(--jz-line);
  background: var(--jz-paper-2);
}

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

/* ---------- 逐阶段叙事 ---------- */

.page-about .about-track__list {
  margin-top: 40px;
  border-top: 1px solid var(--jz-line);
}

.page-about .about-stage {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: 26px 0 30px;
  border-bottom: 1px solid var(--jz-line);
  transition: background .2s var(--ease);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 0;
  height: 2px;
  background: var(--jz-red);
  transition: width .3s var(--ease);
}

.page-about .about-stage:hover::before {
  width: 88px;
}

@media (min-width: 860px) {
  .page-about .about-stage {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0 40px;
    padding: 36px 0 40px;
  }
}

.page-about .about-stage__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

@media (min-width: 860px) {
  .page-about .about-stage__rail {
    flex-direction: column;
    gap: 12px;
  }
}

.page-about .about-stage__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 4.4vw, 48px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--jz-bronze);
  transition: color .2s var(--ease);
}

.page-about .about-stage:hover .about-stage__num {
  color: var(--jz-red);
}

.page-about .about-stage__years {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--jz-gray);
}

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

.page-about .about-stage__top {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 14px;
}

.page-about .about-stage__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(20px, 2.6vw, 27px);
  letter-spacing: -.01em;
  color: var(--jz-deep);
}

.page-about .about-stage__goal {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: #3a3d3b;
}

.page-about .about-stage__list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-stage__list li {
  position: relative;
  padding-left: 22px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--jz-ink);
}

.page-about .about-stage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .82em;
  width: 11px;
  height: 1px;
  background: var(--jz-bronze);
}

/* ---------- 职能组 ---------- */

.page-about .about-team__grid {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--jz-line-soft);
  border: 1px solid var(--jz-line);
}

@media (min-width: 640px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-team__card {
  position: relative;
  background: var(--jz-paper);
  padding: 22px 20px 26px;
  transition: background .18s var(--ease);
}

.page-about .about-team__card::after {
  content: "";
  position: absolute;
  left: 20px;
  bottom: 16px;
  width: 22px;
  height: 1px;
  background: var(--jz-line);
}

.page-about .about-team__card:hover {
  background: var(--jz-paper-2);
}

.page-about .about-team__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--jz-bronze);
}

.page-about .about-team__name {
  margin: 9px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: -.01em;
  color: var(--jz-deep);
}

.page-about .about-team__desc {
  margin: 11px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: #3a3d3b;
}

.page-about .about-team__flow {
  margin: 26px 0 0;
  padding: 16px 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--jz-deep);
  background: var(--jz-paper);
  border-left: 3px solid var(--jz-green);
}

.page-about .about-team__figure {
  margin-top: 32px;
}

.page-about .about-team__figure .figure__frame {
  border: 1px solid var(--jz-line);
  background: var(--jz-paper-2);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}

/* ---------- 产能节奏 ---------- */

.page-about .about-cadence__steps {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--jz-line-soft);
  border: 1px solid var(--jz-line);
}

@media (min-width: 720px) {
  .page-about .about-cadence__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

.page-about .about-cadence__step {
  background: var(--jz-paper);
  padding: 22px 20px 24px;
}

.page-about .about-cadence__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--jz-paper);
  background: var(--jz-mid);
  padding: 3px 9px;
}

.page-about .about-cadence__name {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 19px;
  color: var(--jz-deep);
}

.page-about .about-cadence__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: #3a3d3b;
}

.page-about .about-cadence__cycles {
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

@media (min-width: 820px) {
  .page-about .about-cadence__cycles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px;
  }
}

.page-about .about-cadence__cycle {
  padding-top: 14px;
  border-top: 2px solid var(--jz-bronze);
}

.page-about .about-cadence__cycle dt {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: .02em;
  color: var(--jz-red);
}

.page-about .about-cadence__cycle dd {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.88;
  color: #3a3d3b;
}

/* ---------- 关键节点 ---------- */

.page-about .section--deep .section__title,
.page-about .section--deep .section__num {
  color: var(--jz-paper);
}

.page-about .about-nodes__list {
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: rgba(192, 138, 62, .34);
  border: 1px solid rgba(192, 138, 62, .42);
}

@media (min-width: 780px) {
  .page-about .about-nodes__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-nodes__item {
  background: var(--jz-deep);
  padding: 24px 22px 26px;
}

.page-about .about-nodes__item dt {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17.5px;
  line-height: 1.5;
  letter-spacing: -.01em;
  color: var(--jz-paper);
}

.page-about .about-nodes__item dd {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.88;
  color: var(--jz-on-dark);
}

/* ---------- 结尾引导 ---------- */

.page-about .about-cta {
  border-top: 1px solid var(--jz-line);
  background: linear-gradient(180deg, var(--jz-paper-2) 0%, var(--jz-paper) 100%);
}

.page-about .about-cta__inner {
  text-align: center;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(23px, 3.6vw, 36px);
  letter-spacing: -.02em;
  color: var(--jz-deep);
}

.page-about .about-cta__text {
  margin: 16px auto 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.9;
  color: #3a3d3b;
}

.page-about .about-cta__actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

@media (max-width: 640px) {
  .page-about .about-cta__actions .btn {
    width: 100%;
  }
}