.page-about {
  --about-rail: 240px;
  padding-bottom: clamp(64px, 8vw, 116px);
  background:
    radial-gradient(920px 460px at 88% -4%, rgba(53, 224, 216, .10), transparent 60%),
    radial-gradient(680px 420px at 2% 44%, rgba(242, 184, 75, .07), transparent 64%);
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  padding-top: clamp(26px, 4.6vw, 54px);
}

.page-about .about-intro__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 46px);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-intro h1 {
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -.022em;
  color: var(--white);
  max-width: 20ch;
}

.page-about .about-intro .lede {
  margin-top: clamp(16px, 2.2vw, 22px);
  max-width: 60ch;
}

.page-about .about-intro__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .about-fact {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  background: linear-gradient(158deg, rgba(18, 28, 46, .94), rgba(18, 28, 46, .46));
  box-shadow: var(--shadow-float);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-fact__num--gold {
  color: var(--gold);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 7px;
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--text-dim);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(30px, 4.4vw, 54px);
  margin-top: clamp(44px, 6.4vw, 84px);
}

.page-about .about-rail {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-rail__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--mist);
}

.page-about .about-rail__toc {
  display: grid;
  gap: 2px;
}

.page-about .about-rail__toc .toc__link {
  display: block;
  padding: 9px 12px;
  border-left: 2px solid var(--line-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-dim);
  font-size: .88rem;
  text-decoration: none;
  transition: color .25s ease, background-color .25s ease, border-color .25s ease;
}

.page-about .about-rail__toc .toc__link:hover,
.page-about .about-rail__toc .toc__link.is-active {
  color: var(--white);
  background: rgba(53, 224, 216, .08);
  border-left-color: var(--cyan);
}

.page-about .about-rail__version {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  background: rgba(18, 28, 46, .68);
}

.page-about .about-rail__version-num {
  display: block;
  font-size: 1.35rem;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-rail__version-note {
  display: block;
  margin-top: 9px;
  font-size: .78rem;
  line-height: 1.65;
  color: var(--text-dim);
}

/* ---------- 内容块 ---------- */
.page-about .about-main {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  min-width: 0;
}

.page-about .about-block {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3.2vw, 40px);
  background: linear-gradient(168deg, rgba(18, 28, 46, .78), rgba(11, 18, 32, .6));
  min-width: 0;
}

.page-about .about-block .idx {
  display: inline-block;
  color: var(--cyan);
  font-size: .78rem;
  letter-spacing: .16em;
}

.page-about .about-block .section-head__title {
  margin-top: 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.32rem, 2.6vw, 1.82rem);
  letter-spacing: -.018em;
  line-height: 1.28;
  color: var(--white);
}

.page-about .about-block .section-head__note {
  margin-top: 10px;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--text-dim);
  max-width: 54ch;
}

.page-about .about-block--paper {
  background: var(--paper);
  border-color: rgba(42, 33, 24, .16);
  color: #43382C;
}

.page-about .about-block--paper .section-head__title {
  color: #1C1610;
}

.page-about .about-block--paper .section-head__note {
  color: #6A5A46;
}

.page-about .about-block--paper .idx {
  color: #A9622A;
}

/* ---------- 起点分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .about-split .prose-wrap p {
  margin: 0 0 1em;
  font-size: .96rem;
  line-height: 1.82;
  color: var(--text);
}

.page-about .about-split .prose-wrap p:last-child {
  margin-bottom: 0;
}

/* ---------- 媒体框 ---------- */
.page-about .media-frame {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-deep);
}

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

.page-about .media-frame__caption {
  padding: 12px 15px;
  font-size: .8rem;
  line-height: 1.62;
  color: var(--text-dim);
  background: rgba(7, 13, 23, .62);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-block--paper .media-frame {
  border-color: rgba(42, 33, 24, .18);
}

.page-about .about-block--paper .media-frame__caption {
  color: #6A5A46;
  background: rgba(42, 33, 24, .06);
  border-top-color: rgba(42, 33, 24, .14);
}

/* ---------- 简体版三点 ---------- */
.page-about .about-points {
  display: grid;
  gap: 1px;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  background: rgba(42, 33, 24, .14);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-point {
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--paper);
}

.page-about .about-point__key {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  color: #A9622A;
}

.page-about .about-point h3 {
  margin: 9px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.12rem;
  letter-spacing: -.012em;
  color: #1C1610;
}

.page-about .about-point p {
  margin: 8px 0 0;
  font-size: .93rem;
  line-height: 1.78;
  color: #4A3E30;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin: clamp(20px, 2.8vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  gap: 4px 20px;
  padding: 0 0 clamp(22px, 3vw, 34px) 34px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line-strong);
  box-shadow: 0 0 0 4px rgba(53, 224, 216, .08);
  transition: background-color .3s ease, box-shadow .35s ease, border-color .3s ease;
  z-index: 1;
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 10px;
  top: 22px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 224, 216, .34), rgba(110, 127, 153, .14));
}

.page-about .tl-item:last-child::after {
  display: none;
}

.page-about .tl-item:hover::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 7px rgba(53, 224, 216, .16);
}

.page-about .tl-item__year {
  font-family: var(--font-mono);
  font-size: .95rem;
  letter-spacing: .04em;
  color: var(--cyan);
  transition: color .3s ease;
}

.page-about .tl-item__year--gold {
  color: var(--gold);
}

.page-about .tl-item:hover .tl-item__year {
  color: var(--white);
}

.page-about .tl-item__body h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -.012em;
  color: var(--white);
}

.page-about .tl-item__body p {
  margin: 6px 0 0;
  font-size: .93rem;
  line-height: 1.76;
  color: var(--text-dim);
}

.page-about .tl-item--now .tl-item__body {
  border-left: 2px solid rgba(242, 184, 75, .5);
  padding-left: 16px;
  margin-left: -18px;
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .team-total {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .team-total__num {
  font-family: var(--font-mono);
  font-size: clamp(2.1rem, 5vw, 3rem);
  line-height: 1;
  color: var(--gold);
}

.page-about .team-total__label {
  font-size: .84rem;
  letter-spacing: .08em;
  color: var(--text-dim);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.page-about .team-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 15px 16px;
  background: rgba(11, 18, 32, .55);
}

.page-about .team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-card__name {
  display: block;
  margin-top: 9px;
  font-size: .9rem;
  font-weight: 600;
  color: var(--white);
}

.page-about .team-card__note {
  display: block;
  margin-top: 5px;
  font-size: .82rem;
  line-height: 1.65;
  color: var(--text-dim);
}

/* ---------- 资质 ---------- */
.page-about .compliance-layout {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .compliance-list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: rgba(42, 33, 24, .14);
}

.page-about .compliance-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 13px 18px;
  background: var(--paper);
}

.page-about .compliance-key {
  flex: 0 0 auto;
  min-width: 92px;
  font-size: .78rem;
  letter-spacing: .1em;
  color: #8A7A66;
}

.page-about .compliance-val {
  font-size: .9rem;
  color: #1C1610;
  word-break: break-all;
}

/* ---------- 合作 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .partner-card {
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
  border-radius: var(--radius-sm) var(--radius-md) var(--radius-md) var(--radius-sm);
  padding: 18px 20px;
  background: rgba(11, 18, 32, .55);
}

.page-about .partner-card__tag {
  display: inline-block;
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .partner-card__tag--cyan {
  color: var(--cyan);
}

.page-about .partner-card h3 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.08rem;
  letter-spacing: -.012em;
  color: var(--white);
}

.page-about .partner-card p {
  margin: 8px 0 0;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
  padding-top: clamp(20px, 2.6vw, 28px);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 显现动效 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s ease, transform .6s ease;
}

.page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .tl-item {
    grid-template-columns: 78px minmax(0, 1fr);
    align-items: baseline;
  }

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

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .94fr);
    align-items: start;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .compliance-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, .86fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .82fr);
    align-items: end;
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 100px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-main > .about-block:nth-child(even) {
    margin-left: clamp(0px, 3vw, 46px);
  }
}

@media (max-width: 520px) {
  .page-about .about-intro__facts {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .page-about .tl-item--now .tl-item__body {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .tl-item::before,
  .page-about .tl-item__year,
  .page-about .about-rail__toc .toc__link {
    transition: none;
  }
}