.page-about {
  --about-pad: clamp(18px, 4vw, 44px);
  --about-gap: clamp(64px, 9vw, 118px);
  --about-line: rgba(255, 255, 255, 0.13);
  --about-soft: rgba(232, 238, 247, 0.78);
  padding: 18px var(--about-pad) clamp(64px, 8vw, 104px);
  color: var(--paper);
  font-family: var(--font-body);
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

.page-about .about-inner {
  width: min(1180px, 100%);
  margin-inline: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
}

.page-about .about-hero__inner {
  position: relative;
  padding: clamp(26px, 5vw, 54px) 0 clamp(30px, 4vw, 46px);
  border-bottom: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .about-hero__inner::before {
  content: "";
  position: absolute;
  top: -38%;
  right: -14%;
  width: clamp(260px, 42vw, 540px);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 56% 44%, rgba(61, 245, 142, 0.2), rgba(122, 47, 240, 0.12) 46%, transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-0);
  letter-spacing: 0.22em;
  color: var(--lime);
}

.page-about .about-hero h1 {
  position: relative;
  margin: 14px 0 0;
  max-width: 16ch;
  font-family: var(--font-head);
  font-size: clamp(32px, 7vw, 64px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: 0.02em;
}

.page-about .about-hero h1::after {
  content: "";
  display: block;
  width: clamp(64px, 16vw, 148px);
  height: 4px;
  margin-top: 20px;
  border-radius: 4px;
  background: var(--grad-arena);
}

.page-about .about-hero__lead {
  position: relative;
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .about-hero__stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
  background: var(--glass-line);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ink-void);
}

.page-about .about-hero__stats .k {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4.4vw, 36px);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--lime);
  line-height: 1;
}

.page-about .about-hero__stats .v {
  font-size: var(--fs-0);
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-top: var(--about-gap);
}

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

.page-about .section-head__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-0);
  letter-spacing: 0.22em;
  color: var(--lime);
}

.page-about .section-head h2,
.page-about .about-creed h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(24px, 4.2vw, 42px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.page-about .about-lead {
  margin: 16px 0 0;
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.9;
  color: var(--about-soft);
}

/* ---------- 历程时间轴 ---------- */
.page-about .year-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 30px 0 36px;
}

.page-about .year-jump a {
  padding: 7px 15px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.08em;
  color: var(--paper);
  text-decoration: none;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.page-about .year-jump a:hover,
.page-about .year-jump a:focus-visible {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink-void);
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--violet) 50%, rgba(255, 255, 255, 0.08) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 32px 34px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-void);
  border: 2px solid var(--lime);
  box-shadow: 0 0 0 4px rgba(61, 245, 142, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .timeline__item:hover::before {
  transform: scale(1.16);
  box-shadow: 0 0 0 7px rgba(61, 245, 142, 0.16);
}

.page-about .timeline__year {
  display: inline-block;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-0);
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--ink-void);
  background: var(--lime);
  border-radius: 4px;
}

.page-about .timeline__item h3 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: clamp(17px, 2.4vw, 21px);
  font-weight: 700;
  line-height: 1.42;
  letter-spacing: 0.02em;
}

.page-about .timeline__text {
  margin: 9px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .timeline__detail {
  margin: 10px 0 0;
  max-width: 60ch;
  padding-left: 12px;
  border-left: 2px solid rgba(122, 47, 240, 0.5);
  font-size: var(--fs-1);
  line-height: 1.8;
  color: var(--muted);
  overflow: hidden;
  max-height: 240px;
  opacity: 1;
  transition: max-height 0.4s ease, opacity 0.3s ease, margin-top 0.3s ease;
}

.page-about .about-history__media {
  margin: 40px 0 0;
}

/* ---------- 媒体容器 ---------- */
.page-about .media {
  margin: 0;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-lg);
  background: var(--glass);
  overflow: hidden;
}

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

.page-about .media--cut {
  clip-path: polygon(0 3%, 100% 0, 100% 97%, 0 100%);
  border-radius: 0;
}

.page-about .media__caption {
  padding: 12px 18px 16px;
  font-size: var(--fs-0);
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 26px;
  margin-top: 34px;
}

.page-about .about-team__copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .about-team__copy p + p {
  margin-top: 14px;
}

.page-about .about-team__points {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-team__points li {
  position: relative;
  padding-left: 22px;
  font-size: var(--fs-1);
  line-height: 1.75;
  color: var(--paper);
}

.page-about .about-team__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 2px;
  background: var(--orange);
}

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

.page-about .about-team__groups {
  display: grid;
  gap: 12px;
  margin-top: 30px;
}

.page-about .team-group {
  padding: 2px 18px;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  background: var(--glass);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.page-about .team-group[open] {
  background: var(--ink-deep);
  border-color: rgba(61, 245, 142, 0.36);
}

.page-about .team-group summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .team-group summary::-webkit-details-marker {
  display: none;
}

.page-about .team-group__name {
  font-family: var(--font-head);
  font-size: var(--fs-2);
  font-weight: 700;
  letter-spacing: 0.03em;
}

.page-about .team-group__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-0);
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-about .team-group p {
  margin: 0;
  padding: 0 0 16px;
  font-size: var(--fs-1);
  line-height: 1.85;
  color: var(--about-soft);
}

/* ---------- 资质 ---------- */
.page-about .about-trust__grid {
  display: grid;
  gap: 22px;
  margin-top: 34px;
}

.page-about .badge-wall {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .badge-wall__item {
  position: relative;
  padding: 18px 16px;
  border: 1px solid rgba(217, 164, 65, 0.28);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(217, 164, 65, 0.14), rgba(255, 255, 255, 0.02) 62%);
  overflow: hidden;
}

.page-about .badge-wall__item::after {
  content: "";
  position: absolute;
  right: -30px;
  bottom: -30px;
  width: 78px;
  height: 78px;
  border: 1px solid rgba(217, 164, 65, 0.32);
  border-radius: 50%;
}

.page-about .badge-wall__mark {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--gold);
  line-height: 1.1;
}

.page-about .badge-wall__text {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-0);
  line-height: 1.6;
  color: var(--about-soft);
}

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

/* ---------- 合作生态 ---------- */
.page-about .about-partners__slab {
  position: relative;
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-lg);
  background: linear-gradient(152deg, rgba(110, 30, 60, 0.34), rgba(11, 27, 58, 0.62) 72%);
  overflow: hidden;
}

.page-about .flow {
  display: grid;
  gap: 14px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  padding: 18px 16px;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  background: var(--glass-soft);
}

.page-about .flow .idx {
  font-family: var(--font-mono);
  font-size: var(--fs-3);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .flow h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: var(--fs-2);
  font-weight: 700;
  letter-spacing: 0.03em;
}

.page-about .flow p {
  margin: 8px 0 0;
  font-size: var(--fs-1);
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .ridge {
  display: block;
  width: 100%;
  height: 40px;
  margin-top: 26px;
  fill: var(--ink-deep);
  opacity: 0.9;
}

/* ---------- 运营理念 ---------- */
.page-about .about-creed .about-inner {
  padding-top: clamp(30px, 5vw, 52px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-creed__text {
  max-width: 62ch;
  margin: 18px 0 0;
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.95;
  color: var(--about-soft);
}

.page-about .about-creed__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team__grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
    gap: 32px;
  }

  .page-about .about-trust__grid {
    grid-template-columns: 1fr 0.78fr;
    align-items: center;
    gap: 30px;
  }

  .page-about .about-history__media {
    margin-top: 46px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-team__groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

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

  .page-about .timeline__item {
    padding-left: 42px;
  }

  .page-about .timeline__item::before {
    left: 2px;
  }
}

@media (min-width: 900px) and (hover: hover) {
  .page-about .timeline__detail {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
  }

  .page-about .timeline__item:hover .timeline__detail,
  .page-about .timeline__item:focus-within .timeline__detail {
    max-height: 240px;
    margin-top: 10px;
    opacity: 1;
  }
}