.page-about {
  --about-axis: 236px;
  --about-accent-red: var(--red);
  display: block;
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏声明 ---------- */

.page-about .about-lead {
  position: relative;
  padding: clamp(88px, 12vw, 152px) 0 clamp(32px, 5vw, 64px);
  background:
    radial-gradient(115% 85% at 90% 4%, rgba(14, 46, 51, 0.9) 0%, rgba(14, 46, 51, 0) 60%),
    radial-gradient(72% 68% at 4% 104%, rgba(74, 18, 32, 0.78) 0%, rgba(74, 18, 32, 0) 64%),
    var(--ink);
}

.page-about .about-lead::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(200, 16, 46, 0.6), rgba(217, 164, 65, 0.35), rgba(217, 164, 65, 0));
  pointer-events: none;
}

.page-about .about-lead__shell {
  display: grid;
  gap: 20px;
  max-width: 920px;
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .crumbs__item {
  color: var(--mist);
  text-decoration: none;
}

.page-about .crumbs__item + .crumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(217, 164, 65, 0.5);
}

.page-about a.crumbs__item:hover,
.page-about a.crumbs__item:focus-visible {
  color: var(--gold);
}

.page-about .about-lead h1 {
  margin: 0;
  font-size: clamp(2.1rem, 5.6vw, 4.6rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-lead__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.35vw, 1.15rem);
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.86);
}

.page-about .about-lead__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 6px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-fact {
  display: grid;
  gap: 2px;
  padding: 16px 18px;
  background: rgba(11, 14, 19, 0.86);
}

.page-about .about-fact__num {
  font-family: var(--font-num);
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--gold-flag);
}

.page-about .about-fact__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-drawer {
  margin-top: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: rgba(20, 28, 43, 0.72);
}

.page-about .about-drawer > summary {
  cursor: pointer;
  list-style: none;
  padding: 15px 20px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--gold);
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.page-about .about-drawer > summary::before {
  content: "+";
  font-size: 1rem;
  color: var(--red-lit);
}

.page-about .about-drawer[open] > summary::before {
  content: "–";
}

.page-about .about-drawer__steps {
  margin: 0;
  padding: 4px 22px 20px 42px;
  display: grid;
  gap: 10px;
  counter-reset: drawer-step;
  color: rgba(245, 241, 232, 0.84);
  font-size: 0.94rem;
  line-height: 1.7;
}

.page-about .about-drawer__steps li {
  position: relative;
  padding-left: 4px;
}

.page-about .about-drawer__steps li::marker {
  color: var(--gold-flag);
  font-family: var(--font-mono);
}

/* ---------- 双栏档案骨架 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  padding-bottom: clamp(64px, 10vw, 120px);
}

.page-about .about-axis {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0 12px;
  scrollbar-width: none;
}

.page-about .about-axis::-webkit-scrollbar {
  display: none;
}

.page-about .chapter-counter__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  background: rgba(20, 28, 43, 0.6);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--ease), border-color var(--ease), background var(--ease), transform var(--ease);
}

.page-about .chapter-counter__num {
  font-family: var(--font-num);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  color: rgba(217, 164, 65, 0.8);
}

.page-about .chapter-counter__link:hover,
.page-about .chapter-counter__link:focus-visible {
  color: var(--paper);
  border-color: var(--line);
}

.page-about .chapter-counter__link.is-active {
  color: var(--gold);
  border-color: rgba(217, 164, 65, 0.55);
  background: rgba(217, 164, 65, 0.09);
  transform: translateX(2px);
}

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

.page-about .chapter {
  padding-top: clamp(30px, 5vw, 56px);
  scroll-margin-top: 108px;
}

.page-about .chapter + .chapter {
  margin-top: clamp(24px, 4vw, 48px);
  border-top: 1px solid var(--line-soft);
}

.page-about .chapter__head {
  max-width: 68ch;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .chapter h2 {
  margin: 10px 0 14px;
  font-size: clamp(1.55rem, 3.4vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .chapter__lede {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.82);
}

/* ---------- 01 团队构成 ---------- */

.page-about .squad-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  row-gap: 24px;
}

.page-about .squad-card {
  position: relative;
  padding: 24px 22px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-l) var(--radius-m) var(--radius-l) var(--radius-m);
  background: linear-gradient(158deg, rgba(14, 46, 51, 0.9) 0%, rgba(20, 28, 43, 0.94) 72%);
  transition: transform var(--ease), border-color var(--ease);
}

.page-about .squad-card::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 0;
  width: 48px;
  height: 2px;
  background: var(--accent, var(--gold));
}

.page-about .squad-card:hover,
.page-about .squad-card:focus-within {
  border-color: var(--line);
  transform: translateY(-2px);
}

.page-about .squad-card:focus-visible {
  outline: 2px solid var(--sky);
  outline-offset: 3px;
}

.page-about .squad-card--ops { --accent: var(--sky); }
.page-about .squad-card--data { --accent: var(--red); background: linear-gradient(158deg, rgba(74, 18, 32, 0.72) 0%, rgba(20, 28, 43, 0.94) 72%); }
.page-about .squad-card--visual { --accent: var(--gold-flag); }
.page-about .squad-card--care { --accent: var(--gold); background: linear-gradient(158deg, rgba(42, 18, 22, 0.85) 0%, rgba(20, 28, 43, 0.94) 72%); }

.page-about .squad-card__code {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: rgba(154, 163, 175, 0.9);
}

.page-about .squad-card h3 {
  margin: 0;
  font-size: 1.24rem;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .squad-card__count {
  margin: 4px 0 12px;
  font-family: var(--font-num);
  font-size: 1.9rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--accent, var(--gold));
}

.page-about .squad-card p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: rgba(245, 241, 232, 0.8);
}

.page-about .squad-card__duties {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  border-left: 1px solid var(--line-soft);
  padding-left: 0;
  transition: max-height 260ms cubic-bezier(0.22, 0.61, 0.36, 1), opacity 200ms ease, margin-top 220ms ease, padding-left 220ms ease;
}

.page-about .squad-card:hover .squad-card__duties,
.page-about .squad-card:focus-within .squad-card__duties {
  max-height: 240px;
  opacity: 1;
  margin-top: 14px;
  padding-left: 14px;
}

.page-about .squad-card__duties li {
  font-size: 0.86rem;
  line-height: 1.7;
  color: rgba(245, 241, 232, 0.72);
}

.page-about .squad-card__duties li + li {
  margin-top: 6px;
}

/* ---------- 图片容器 ---------- */

.page-about .figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: linear-gradient(140deg, var(--jade), var(--wine-deep));
  box-shadow: inset 0 0 90px rgba(200, 16, 46, 0.16);
}

.page-about .figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-about .figure--wide .figure__img {
  aspect-ratio: 14 / 9;
}

.page-about .figure__caption {
  padding: 12px 18px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 02 数据流转 ---------- */

.page-about .flow {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  display: grid;
  gap: 16px;
}

.page-about .flow::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold-flag), var(--red), rgba(217, 164, 65, 0));
}

.page-about .flow__step {
  position: relative;
  padding: 18px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m) var(--radius-l) var(--radius-m) var(--radius-l);
  background: rgba(74, 18, 32, 0.4);
}

.page-about .flow__step::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 26px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold-flag);
  box-shadow: 0 0 0 4px rgba(242, 183, 5, 0.14);
}

.page-about .flow__time {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .flow__step h3 {
  margin: 0 0 8px;
  font-size: 1.16rem;
  color: var(--paper);
}

.page-about .flow__step p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: rgba(245, 241, 232, 0.82);
}

/* ---------- 03 判罚归类 ---------- */

.page-about .dim-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .dim-card {
  padding: 20px;
  border: 1px solid rgba(242, 183, 5, 0.2);
  border-radius: var(--radius-s) var(--radius-m) var(--radius-s) var(--radius-m);
  background: linear-gradient(200deg, rgba(42, 18, 22, 0.9), rgba(20, 28, 43, 0.9));
}

.page-about .dim-card__key {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--gold-flag);
}

.page-about .dim-card h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
  color: var(--paper);
}

.page-about .dim-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(245, 241, 232, 0.78);
}

.page-about .duo-check {
  margin-top: 18px;
  padding: 22px;
  border-radius: var(--radius-l);
  background: rgba(14, 46, 51, 0.55);
  border-left: 3px solid var(--red);
}

.page-about .duo-check__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--red-lit);
}

.page-about .duo-check p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.82;
  color: rgba(245, 241, 232, 0.84);
}

/* ---------- 04 宽屏适配 ---------- */

.page-about .ratio-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .ratio-chip {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  border-radius: var(--radius-m);
  border: 1px solid rgba(46, 155, 214, 0.28);
  background: linear-gradient(120deg, rgba(14, 46, 51, 0.85), rgba(20, 28, 43, 0.9));
}

.page-about .ratio-chip__label {
  font-family: var(--font-num);
  font-size: 2rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--sky);
}

.page-about .ratio-chip__desc {
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(245, 241, 232, 0.78);
}

.page-about .check-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .check-list li {
  padding: 14px 0 0;
  border-top: 1px dashed var(--line-soft);
  font-size: 0.93rem;
  line-height: 1.78;
  color: rgba(245, 241, 232, 0.82);
}

.page-about .check-list__key {
  display: inline-block;
  min-width: 5.4em;
  margin-right: 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .check-list a {
  color: var(--sky);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 155, 214, 0.45);
}

.page-about .check-list a:hover,
.page-about .check-list a:focus-visible {
  color: var(--red-lit);
  border-bottom-color: var(--red-lit);
}

/* ---------- 05 反馈响应 ---------- */

.page-about .desk-list {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .desk-row {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  background: rgba(20, 28, 43, 0.92);
}

.page-about .desk-row__type {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .desk-row__owner {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .desk-row__note {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.76;
  color: rgba(245, 241, 232, 0.76);
}

.page-about .desk-row__note a {
  color: var(--sky);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 155, 214, 0.45);
}

.page-about .desk-row__note a:hover,
.page-about .desk-row__note a:focus-visible {
  color: var(--red-lit);
  border-bottom-color: var(--red-lit);
}

.page-about .desk-hours {
  margin: 18px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--gold);
  font-size: 0.92rem;
  line-height: 1.78;
  color: rgba(245, 241, 232, 0.8);
}

/* ---------- 06 时间线 ---------- */

.page-about .timeline {
  position: relative;
  margin-top: clamp(24px, 4vw, 40px);
  padding-left: 26px;
  display: grid;
  gap: 12px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(217, 164, 65, 0.1), var(--gold), rgba(200, 16, 46, 0.9));
}

.page-about .timeline__node {
  position: relative;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: rgba(20, 28, 43, 0.76);
  overflow: hidden;
}

.page-about .timeline__node[open] {
  border-color: var(--line);
  background: rgba(14, 46, 51, 0.6);
}

.page-about .timeline__summary {
  cursor: pointer;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 16px 20px 16px 22px;
}

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

.page-about .timeline__dot {
  position: absolute;
  left: -26px;
  top: 24px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(217, 164, 65, 0.14);
}

.page-about .timeline__node[open] .timeline__dot {
  background: var(--red-lit);
  box-shadow: 0 0 0 5px rgba(228, 34, 58, 0.18);
}

.page-about .timeline__when {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .timeline__title {
  font-size: 1.04rem;
  line-height: 1.5;
  font-weight: 700;
  color: var(--paper);
}

.page-about .timeline__body {
  padding: 0 20px 18px 22px;
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.8);
}

.page-about .timeline__body a {
  color: var(--sky);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 155, 214, 0.45);
}

.page-about .timeline__body a:hover,
.page-about .timeline__body a:focus-visible {
  color: var(--red-lit);
  border-bottom-color: var(--red-lit);
}

/* ---------- 07 协作节奏 ---------- */

.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .partner-card {
  padding: 20px;
  border-radius: var(--radius-m) var(--radius-l) var(--radius-m) var(--radius-l);
  border: 1px solid var(--line-soft);
  background: linear-gradient(150deg, rgba(74, 18, 32, 0.55), rgba(20, 28, 43, 0.92));
}

.page-about .partner-card:nth-child(even) {
  background: linear-gradient(150deg, rgba(14, 46, 51, 0.7), rgba(20, 28, 43, 0.92));
}

.page-about .partner-card h3 {
  margin: 0 0 8px;
  font-size: 1.06rem;
  color: var(--paper);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.76;
  color: rgba(245, 241, 232, 0.78);
}

.page-about .partner-cta {
  margin-top: 22px;
  padding: 24px;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  background:
    radial-gradient(90% 130% at 100% 0%, rgba(200, 16, 46, 0.22), rgba(200, 16, 46, 0) 62%),
    rgba(11, 14, 19, 0.9);
}

.page-about .partner-cta > p {
  margin: 0 0 14px;
  font-size: 0.96rem;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.86);
}

.page-about .partner-cta__contact {
  display: grid;
  gap: 6px;
  margin: 0 0 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .partner-cta .btn {
  display: inline-block;
  text-decoration: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-lead__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .squad-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: 34px;
  }

  .page-about .squad-card:nth-child(even) {
    transform: translateY(20px);
  }

  .page-about .squad-card:nth-child(even):hover,
  .page-about .squad-card:nth-child(even):focus-within {
    transform: translateY(18px);
  }

  .page-about .desk-row {
    grid-template-columns: 10rem 12rem minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-axis) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-axis {
    position: sticky;
    top: 104px;
    align-self: start;
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding: 0 0 0 16px;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .chapter-counter__link {
    justify-content: flex-start;
    background: transparent;
    border-color: transparent;
    padding: 9px 12px;
  }

  .page-about .chapter-counter__link.is-active {
    transform: translateX(4px);
  }

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

@media (max-width: 759px) {
  .page-about .squad-card__duties {
    max-height: none;
    opacity: 1;
    margin-top: 14px;
    padding-left: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .squad-card,
  .page-about .squad-card__duties,
  .page-about .chapter-counter__link {
    transition: none;
  }

  .page-about .squad-card:nth-child(even),
  .page-about .squad-card:nth-child(even):hover,
  .page-about .squad-card:nth-child(even):focus-within {
    transform: none;
  }
}