.page-about {
  --about-line: 2px solid var(--navy);
  --about-radius: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2.5rem, 7vw, 5rem);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(118deg, transparent 58%, rgba(30, 58, 138, .07) 58.2%, rgba(201, 162, 39, .12) 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 5vw, 3.25rem);
}

.page-about .about-hero h1 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 3.5rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--navy);
  margin: 0 0 1.1rem;
}

.page-about .about-hero__lead {
  font-size: 1.02rem;
  line-height: 1.9;
  color: var(--ink);
  max-width: 46ch;
  margin: 0 0 1.5rem;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--line);
  box-shadow: var(--shadow-lg);
}

.page-about .about-hero__cap {
  margin-top: .85rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .05em;
  color: var(--gray);
  padding-left: .75rem;
  border-left: 3px solid var(--gold);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.02fr 0.98fr;
    align-items: center;
  }
  .page-about .about-hero__media {
    transform: translateY(-8px);
  }
}

/* ---------- 通用区块标题 ---------- */
.page-about .about-audience__head,
.page-about .about-timeline__head,
.page-about .about-team__head,
.page-about .about-release__head,
.page-about .about-numbers__head {
  max-width: 62ch;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-audience h2,
.page-about .about-timeline h2,
.page-about .about-taxonomy h2,
.page-about .about-team h2,
.page-about .about-release h2,
.page-about .about-numbers h2,
.page-about .about-cta h2 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--navy);
  margin: 0 0 .85rem;
}

.page-about .about-audience__intro,
.page-about .about-timeline__intro,
.page-about .about-team__intro,
.page-about .about-release__intro {
  margin: 0;
  color: var(--ink);
  line-height: 1.85;
}

/* ---------- 使用场景 ---------- */
.page-about .about-audience__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gutter);
}

.page-about .about-audience__card {
  position: relative;
  background: var(--white);
  border: var(--line);
  box-shadow: var(--shadow);
  padding: clamp(1.25rem, 3vw, 1.8rem);
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.page-about .about-audience__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.page-about .about-audience__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--navy);
  background: var(--gold);
  padding: .25rem .6rem;
  border: 2px solid var(--navy);
  margin-bottom: 1rem;
}

.page-about .about-audience__card h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.12rem;
  line-height: 1.5;
  color: var(--navy);
  margin: 0 0 .7rem;
}

.page-about .about-audience__card p {
  margin: 0;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--ink);
}

@media (min-width: 720px) {
  .page-about .about-audience__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.6rem;
  position: relative;
  display: grid;
  gap: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--gold-hi) 42%, rgba(201, 162, 39, .16) 100%);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.6rem;
  top: .35rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ivory);
  border: 2px solid var(--navy);
  box-shadow: inset 0 0 0 3px var(--gold);
  z-index: 1;
}

.page-about .about-timeline__stage {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--gold-hi);
  background: var(--navy);
  border: 2px solid var(--navy);
  padding: .22rem .6rem;
  margin: 0 0 .8rem;
}

.page-about .about-timeline__title {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.4vw, 1.85rem);
  line-height: 1.35;
  color: var(--navy);
  margin: 0 0 .7rem;
}

.page-about .about-timeline__text {
  margin: 0;
  line-height: 1.9;
  color: var(--ink);
  max-width: 58ch;
}

@media (min-width: 760px) {
  .page-about .about-timeline__list {
    padding-left: 2.4rem;
  }
  .page-about .about-timeline__item::before {
    left: -2.4rem;
  }
}

/* ---------- 分类逻辑 ---------- */
.page-about .about-taxonomy__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 5vw, 3rem);
  align-items: start;
}

.page-about .about-taxonomy__intro p {
  margin: 0 0 1rem;
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-taxonomy__intro p:last-child {
  margin-bottom: 0;
}

.page-about .about-taxonomy__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .75rem;
  border: var(--about-line);
  background: var(--white);
  box-shadow: var(--shadow);
  padding: clamp(.85rem, 2vw, 1.25rem);
}

.page-about .about-taxonomy__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: .3rem;
  padding: .35rem .25rem;
}

.page-about .about-taxonomy__stat + .about-taxonomy__stat {
  border-left: 1px solid rgba(35, 38, 43, .16);
}

.page-about .about-taxonomy__num {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.9rem, 5vw, 2.75rem);
  line-height: 1;
  color: var(--royal);
  letter-spacing: -0.02em;
}

.page-about .about-taxonomy__unit {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--gray);
}

.page-about .about-taxonomy__figure {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-taxonomy__figure figure,
.page-about .about-team__figure figure {
  margin: 0;
}

.page-about .about-taxonomy__figure img,
.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--line);
  box-shadow: var(--shadow);
}

.page-about .about-taxonomy__cap,
.page-about .about-team__cap {
  margin-top: .85rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .05em;
  color: var(--gray);
  padding-left: .75rem;
  border-left: 3px solid var(--teal);
}

@media (min-width: 900px) {
  .page-about .about-taxonomy__grid {
    grid-template-columns: 1.35fr 1fr;
    gap: clamp(2rem, 5vw, 4rem);
  }
}

/* ---------- 团队 ---------- */
.page-about .team-tabs {
  position: relative;
}

.page-about .team-tabs__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .team-tabs__nav {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  padding-bottom: 0;
  border-bottom: 2px solid var(--navy);
  margin-bottom: 0;
}

.page-about .team-tabs__label {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--navy);
  background: var(--ivory);
  border: 2px solid var(--navy);
  border-bottom: none;
  padding: .7rem 1rem;
  cursor: pointer;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-about .team-tabs__label:hover {
  background: var(--gold-hi);
}

.page-about .team-tabs__input:nth-of-type(1):checked ~ .team-tabs__nav .team-tabs__label:nth-child(1),
.page-about .team-tabs__input:nth-of-type(2):checked ~ .team-tabs__nav .team-tabs__label:nth-child(2),
.page-about .team-tabs__input:nth-of-type(3):checked ~ .team-tabs__nav .team-tabs__label:nth-child(3) {
  background: var(--navy);
  color: var(--gold-hi);
}

.page-about .team-tabs__input:nth-of-type(1):focus-visible ~ .team-tabs__nav .team-tabs__label:nth-child(1),
.page-about .team-tabs__input:nth-of-type(2):focus-visible ~ .team-tabs__nav .team-tabs__label:nth-child(2),
.page-about .team-tabs__input:nth-of-type(3):focus-visible ~ .team-tabs__nav .team-tabs__label:nth-child(3) {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}

.page-about .team-tabs__panels {
  border: 2px solid var(--navy);
  border-top: none;
  background: var(--white);
  padding: clamp(1.25rem, 3.5vw, 2rem);
  min-height: 1px;
}

.page-about .team-tabs__panel {
  display: none;
}

.page-about .team-tabs__input:nth-of-type(1):checked ~ .team-tabs__panels .team-tabs__panel:nth-child(1),
.page-about .team-tabs__input:nth-of-type(2):checked ~ .team-tabs__panels .team-tabs__panel:nth-child(2),
.page-about .team-tabs__input:nth-of-type(3):checked ~ .team-tabs__panels .team-tabs__panel:nth-child(3) {
  display: block;
}

.page-about .team-tabs__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--white);
  background: var(--teal);
  border: 2px solid var(--navy);
  padding: .22rem .6rem;
  margin-bottom: 1rem;
}

.page-about .team-tabs__panel p {
  margin: 0 0 .9rem;
  line-height: 1.9;
  color: var(--ink);
  max-width: 62ch;
}

.page-about .team-tabs__panel p:last-child {
  margin-bottom: 0;
}

.page-about .about-team__figure {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

@media (min-width: 760px) {
  .page-about .team-tabs__label {
    padding: .8rem 1.4rem;
    font-size: .82rem;
  }
}

/* ---------- 版本发布 ---------- */
.page-about .about-release__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.5rem);
  counter-reset: none;
}

.page-about .about-release__step {
  position: relative;
  background: var(--white);
  border: var(--about-line);
  box-shadow: var(--shadow);
  padding: clamp(1.15rem, 3vw, 1.6rem) clamp(1.15rem, 3vw, 1.6rem) clamp(1.15rem, 3vw, 1.6rem) clamp(3.4rem, 9vw, 4.4rem);
}

.page-about .about-release__stepnum {
  position: absolute;
  left: clamp(1rem, 2.6vw, 1.35rem);
  top: clamp(1.15rem, 3vw, 1.6rem);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-about .about-release__step h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.5;
  color: var(--navy);
  margin: 0 0 .55rem;
}

.page-about .about-release__step p {
  margin: 0;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--ink);
}

@media (min-width: 860px) {
  .page-about .about-release__steps {
    grid-template-columns: repeat(2, 1fr);
    gap: clamp(1.25rem, 3vw, 1.75rem);
  }
}

/* ---------- 规模数字 ---------- */
.page-about .about-numbers__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
  border-top: 2px solid var(--navy);
  padding-top: clamp(1.5rem, 3.5vw, 2.25rem);
}

.page-about .about-numbers__item {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(35, 38, 43, .16);
}

.page-about .about-numbers__num {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(2.1rem, 6vw, 3.2rem);
  line-height: 1;
  color: var(--royal);
  letter-spacing: -0.03em;
  display: inline-flex;
  align-items: baseline;
}

.page-about .about-numbers__u {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: .34em;
  color: var(--gray);
  margin-left: .35em;
  letter-spacing: .06em;
}

.page-about .about-numbers__label {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--navy);
}

.page-about .about-numbers__desc {
  margin: 0;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--gray);
  max-width: 34ch;
}

@media (min-width: 1024px) {
  .page-about .about-numbers__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(1.5rem, 3vw, 2.25rem);
  }
}

/* ---------- 结尾导流 ---------- */
.page-about .about-cta {
  padding-bottom: clamp(3rem, 8vw, 5rem);
}

.page-about .about-cta__inner {
  background: var(--navy);
  color: var(--white);
  border: var(--about-line);
  box-shadow: var(--shadow-gold);
  padding: clamp(1.75rem, 4.5vw, 3rem);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3vw, 2rem);
  position: relative;
  overflow: hidden;
}

.page-about .about-cta__inner::after {
  content: "";
  position: absolute;
  right: -70px;
  top: -70px;
  width: 200px;
  height: 200px;
  background: linear-gradient(135deg, rgba(201, 162, 39, .35), transparent 70%);
  transform: rotate(20deg);
  pointer-events: none;
}

.page-about .about-cta h2 {
  color: var(--gold-hi);
  margin-bottom: .8rem;
}

.page-about .about-cta__text p {
  margin: 0;
  line-height: 1.9;
  color: rgba(255, 255, 255, .88);
  max-width: 56ch;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

@media (min-width: 880px) {
  .page-about .about-cta__inner {
    grid-template-columns: 1.4fr 1fr;
    align-items: center;
    gap: clamp(2rem, 5vw, 3.5rem);
  }
  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-audience__card,
  .page-about .team-tabs__label {
    transition: none;
  }
  .page-about .about-audience__card:hover {
    transform: none;
  }
}