.page-about {
  position: relative;
  background: var(--ink-950);
  color: var(--paper-050);
  overflow-x: hidden;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(44, 76, 66, 0.22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(44, 76, 66, 0.22) 1px, transparent 1px);
  background-size: 88px 88px;
  pointer-events: none;
  z-index: 0;
}

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

.page-about a {
  color: var(--lime-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 242, 78, 0.45);
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--lime-400);
  border-bottom-color: var(--lime-400);
}

.page-about :focus-visible {
  outline: 2px solid var(--lime-400);
  outline-offset: 2px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(24px, 4vw, 48px) 0 clamp(36px, 6vw, 76px);
  border-bottom: var(--hair);
  background:
    radial-gradient(120% 100% at 6% 0%, rgba(23, 51, 43, 0.85), transparent 62%),
    var(--ink-950);
}

.page-about .about-hero .qh-breadcrumb {
  margin-bottom: clamp(20px, 4vw, 40px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6.2vw, 74px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin: 16px 0 0;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin-top: clamp(20px, 3vw, 34px);
  padding-left: clamp(14px, 2vw, 22px);
  border-left: 2px solid var(--lime-400);
  max-width: 64ch;
}

.page-about .about-hero__lede p {
  margin: 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--paper-050);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-300);
  border: var(--hair);
}

.page-about .about-facts li {
  background: var(--pitch-900);
  padding: 14px 16px;
}

.page-about .about-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 3.6vw, 34px);
  letter-spacing: -0.02em;
  color: var(--lime-400);
}

.page-about .about-facts__key {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate-400);
}

/* ---------- 章节外壳 ---------- */

.page-about .about-section {
  padding: clamp(40px, 7vw, 92px) 0;
  border-bottom: var(--hair);
}

.page-about .about-section h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 12px 0 0;
  max-width: 22ch;
}

.page-about .about-section h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.35;
  margin: 0;
}

.page-about .about-section h4 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  margin: 12px 0 0;
}

.page-about .about-panel {
  padding: clamp(22px, 3.6vw, 48px);
}

.page-about .about-head {
  max-width: 72ch;
}

.page-about .about-head__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate-400);
}

/* ---------- 缘起（窄面板 + 右图） ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-split__media {
  aspect-ratio: 7 / 4;
  margin: 0;
  border: var(--hair);
}

.page-about .about-split__text .qh-plate {
  margin-bottom: 4px;
}

/* ---------- 信息组织方法 ---------- */

.page-about .about-method {
  margin-top: clamp(26px, 4vw, 44px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 44px);
}

.page-about .about-method__figure {
  border: var(--hair);
  background: var(--pitch-900);
  padding: clamp(18px, 2.4vw, 28px);
}

.page-about .about-rhythm {
  margin-top: 18px;
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 148px;
  padding-bottom: 0;
  border-bottom: 1px solid var(--line-300);
}

.page-about .about-rhythm span {
  flex: 1 1 0;
  min-width: 4px;
  height: var(--h, 40%);
  background: linear-gradient(180deg, var(--pitch-700), var(--line-300));
  transition: background 180ms ease-out;
}

.page-about .about-rhythm span:nth-child(1) { --h: 34%; }
.page-about .about-rhythm span:nth-child(2) { --h: 46%; }
.page-about .about-rhythm span:nth-child(3) { --h: 58%; }
.page-about .about-rhythm span:nth-child(4) { --h: 40%; }
.page-about .about-rhythm span:nth-child(5) { --h: 76%; }
.page-about .about-rhythm span:nth-child(6) { --h: 88%; }
.page-about .about-rhythm span:nth-child(7) { --h: 52%; }
.page-about .about-rhythm span:nth-child(8) { --h: 62%; }
.page-about .about-rhythm span:nth-child(9) { --h: 30%; }
.page-about .about-rhythm span:nth-child(10) { --h: 70%; }
.page-about .about-rhythm span:nth-child(11) { --h: 44%; }
.page-about .about-rhythm span:nth-child(12) { --h: 36%; }

.page-about .about-rhythm span:nth-child(5),
.page-about .about-rhythm span:nth-child(6),
.page-about .about-rhythm span:nth-child(10) {
  background: linear-gradient(180deg, var(--amber-500), rgba(227, 160, 58, 0.25));
}

.page-about .about-rhythm__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--slate-400);
}

.page-about .about-method__tip {
  margin: 18px 0 0;
  padding: 14px 16px;
  border-left: 2px solid var(--amber-500);
  background: rgba(23, 51, 43, 0.6);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .about-blocks-head {
  margin-top: clamp(30px, 4.4vw, 56px);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-filterbar {
  flex-wrap: wrap;
}

.page-about .about-blocks {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-300);
  border: var(--hair);
}

.page-about .about-block {
  background: var(--pitch-900);
  border: 0;
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .about-block p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate-400);
}

/* ---------- 覆盖与节奏 ---------- */

.page-about .about-section--cover {
  background: linear-gradient(180deg, rgba(16, 32, 27, 0.9), rgba(10, 20, 17, 1));
}

.page-about .about-cover__lede {
  margin: 16px 0 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate-400);
}

.page-about .about-cover__figures {
  margin: clamp(24px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-300);
  border: var(--hair);
}

.page-about .about-cover__item {
  background: var(--pitch-900);
  padding: 20px;
}

.page-about .about-cover__item dt {
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--slate-400);
}

.page-about .about-cover__item dd {
  margin: 14px 0 0;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-cover__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(26px, 4.4vw, 40px);
  letter-spacing: -0.03em;
  color: var(--amber-500);
}

.page-about .about-cover__unit {
  font-size: 13px;
  color: var(--paper-050);
}

.page-about .about-cover__foot {
  margin-top: clamp(22px, 3.4vw, 36px);
  padding-top: 18px;
  border-top: 1px solid var(--line-300);
  position: relative;
  max-width: 78ch;
}

.page-about .about-cover__foot::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 64px;
  height: 1px;
  background: var(--amber-500);
}

.page-about .about-cover__foot p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-050);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  list-style: none;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-300);
  border: var(--hair);
}

.page-about .about-team__card {
  background: var(--pitch-900);
  border: 0;
  padding: clamp(18px, 2.4vw, 26px);
  display: flex;
  flex-direction: column;
  transition: background 180ms ease-out;
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  background: var(--pitch-700);
}

.page-about .about-team__card .qh-tag {
  align-self: flex-start;
}

.page-about .about-team__num {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime-400);
}

.page-about .about-team__card h3 {
  margin-top: 12px;
  font-size: 16px;
}

.page-about .about-team__brief {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--paper-050);
}

.page-about .about-team__more {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-300);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--slate-400);
  opacity: 0.72;
  transition: opacity 180ms ease-out;
}

.page-about .about-team__card:hover .about-team__more,
.page-about .about-team__card:focus-within .about-team__more {
  opacity: 1;
}

/* ---------- 版本演进 ---------- */

.page-about .about-vers__figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
  border: var(--hair);
}

.page-about .about-vers {
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-vers__legend {
  margin: 0 0 14px;
}

.page-about .about-vers__item {
  border-top: var(--hair);
  background: var(--pitch-900);
}

.page-about .about-vers__item:last-of-type {
  border-bottom: var(--hair);
}

.page-about .about-vers__item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding: 18px clamp(16px, 2.4vw, 24px);
  border-left: 3px solid transparent;
  transition: border-color 180ms ease-out, background 180ms ease-out;
}

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

.page-about .about-vers__item summary:hover {
  background: var(--pitch-700);
}

.page-about .about-vers__item[open] > summary {
  border-left-color: var(--lime-400);
  background: var(--pitch-700);
}

.page-about .about-vers__no {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--lime-400);
}

.page-about .about-vers__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
}

.page-about .about-vers__hint {
  font-size: 13px;
  color: var(--slate-400);
}

.page-about .about-vers__body {
  padding: 0 clamp(16px, 2.4vw, 24px) 22px;
}

.page-about .about-vers__body p {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate-400);
}

/* ---------- 合作与认可 ---------- */

.page-about .about-partners {
  background: linear-gradient(135deg, rgba(87, 73, 168, 0.32), rgba(16, 32, 27, 0.96) 55%);
}

.page-about .about-partners__grid {
  margin-top: clamp(22px, 3.4vw, 38px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-partners__col {
  padding-top: 16px;
  border-top: 1px solid var(--line-300);
}

.page-about .about-partners__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime-200);
}

.page-about .about-partners__col h3 {
  margin-top: 10px;
  font-size: 16px;
}

.page-about .about-partners__col p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--paper-050);
}

/* ---------- 工作方式 ---------- */

.page-about .about-ethos {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.6vw, 48px);
  align-items: start;
}

.page-about .about-ethos__media {
  aspect-ratio: 12 / 7;
  margin: 0;
  border: var(--hair);
}

/* ---------- 结尾引导 ---------- */

.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: center;
  padding: clamp(24px, 3.6vw, 44px);
  border: var(--hair);
  background:
    linear-gradient(120deg, rgba(23, 51, 43, 0.95), rgba(10, 20, 17, 0.95));
  position: relative;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 96px;
  height: 3px;
  background: var(--lime-400);
}

.page-about .about-cta__text h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.15;
  letter-spacing: -0.015em;
}

.page-about .about-cta__text p {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate-400);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__actions .qh-btn {
  border-bottom: 1px solid transparent;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

  .page-about .about-blocks-head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-method {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
    align-items: start;
  }

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

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

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

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

  .page-about .about-ethos {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rhythm span,
  .page-about .about-team__card,
  .page-about .about-team__more,
  .page-about .about-vers__item summary {
    transition: none;
  }
}