.page-about {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: clamp(20px, 3vw, 36px);
}

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

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 3.4vw, 40px) 0 clamp(48px, 6vw, 92px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--hair) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hair) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: .5;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .95), transparent 82%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .95), transparent 82%);
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

.page-about .about-hero-copy {
  min-width: 0;
}

.page-about .about-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 8vw, 84px);
  line-height: .98;
  letter-spacing: -.015em;
  color: var(--paper);
  max-width: 15ch;
}

.page-about .about-title em {
  font-style: normal;
  color: var(--gold-lit);
}

.page-about .about-lead {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cool-soft);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 18px 0 0;
  background: var(--hair);
  border: 1px solid var(--hair);
}

.page-about .about-facts .fact {
  background: var(--char);
  padding: 14px 14px 16px;
  min-width: 0;
}

.page-about .about-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cool);
}

.page-about .about-facts dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--gold-lit);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin {
  padding: 0 0 clamp(48px, 6vw, 88px);
}

.page-about .about-paper {
  color: var(--ink);
  padding: clamp(24px, 4vw, 52px);
  position: relative;
}

.page-about .about-origin-grid {
  display: grid;
  gap: clamp(18px, 3vw, 40px);
}

.page-about .about-origin-head .mono-label {
  color: #6a6355;
}

.page-about .about-origin-head .section-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 42px);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--ink);
  max-width: 18ch;
}

.page-about .about-origin-prose {
  color: #33302a;
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-origin-prose p {
  margin: 0 0 14px;
}

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

.page-about .origin-points {
  list-style: none;
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--edge);
  border-top: 1px solid var(--edge);
}

.page-about .origin-points li {
  background: var(--paper);
  padding: 16px 0 4px;
}

.page-about .origin-points strong {
  display: block;
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .origin-points strong::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 9px;
  background: var(--gold);
  vertical-align: 1px;
}

.page-about .origin-points span {
  display: block;
  margin-top: 7px;
  padding-left: 17px;
  font-size: 15px;
  line-height: 1.75;
  color: #4a463d;
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestones {
  padding: clamp(44px, 6vw, 86px) 0;
  background: var(--char);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}

.page-about .ms-head {
  max-width: 62ch;
}

.page-about .ms-head .section-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 48px);
  line-height: 1.1;
  letter-spacing: -.012em;
  color: var(--paper);
}

.page-about .ms-intro {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cool-soft);
}

.page-about .ms-figure {
  margin: clamp(24px, 3.6vw, 40px) 0;
  border: 1px solid var(--hair);
}

.page-about .ms-layout {
  display: grid;
  gap: 18px;
}

.page-about .ms-index .mono-label {
  margin: 0 0 10px;
}

.page-about .ms-index ul {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ms-index ul::-webkit-scrollbar {
  display: none;
}

.page-about .ms-index a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 11px;
  border: 1px solid var(--hair-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cool-soft);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .ms-index a .dot {
  width: 5px;
  height: 5px;
  background: var(--gold);
  flex: none;
}

.page-about .ms-index a:hover,
.page-about .ms-index a:focus-visible {
  color: var(--ink);
  background: var(--gold-lit);
  border-color: var(--gold-lit);
}

.page-about .ms-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(250px, 82vw);
  gap: 12px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 14px;
  scrollbar-width: thin;
  scrollbar-color: var(--gold-hair) transparent;
}

.page-about .ms-card {
  scroll-snap-align: start;
  background: var(--ink);
  border: 1px solid var(--hair);
  border-left: 2px solid var(--gold-hair);
  padding: 20px 18px 24px;
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .ms-card:hover,
.page-about .ms-card:focus-within {
  border-color: var(--gold);
  border-left-color: var(--gold);
  transform: translateY(-3px);
}

.page-about .ms-card--now {
  border-left-color: var(--amber);
  background: #16191d;
}

.page-about .ms-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--gold);
}

.page-about .ms-card .tag {
  display: inline-block;
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
}

.page-about .ms-card h3 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .ms-card p:last-child {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--cool-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(44px, 6vw, 88px) 0;
}

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

.page-about .team-head .section-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1.1;
  letter-spacing: -.012em;
  color: var(--paper);
}

.page-about .team-intro {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cool-soft);
}

.page-about .team-grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(24px, 3.6vw, 40px);
}

.page-about .team-cell {
  background: var(--panel);
  border: 1px solid var(--hair);
  padding: 18px 18px 20px;
  position: relative;
}

.page-about .team-cell::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 14px;
  height: 14px;
  border-top: 2px solid var(--gold-hair);
  border-left: 2px solid var(--gold-hair);
}

.page-about .team-cell[open] {
  border-color: var(--gold-hair);
}

.page-about summary {
  list-style: none;
  cursor: pointer;
}

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

.page-about .team-cell summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .team-coord {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .team-name {
  font-family: var(--font-display);
  font-size: 21px;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .team-chev,
.page-about .step-chev {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cool);
  transition: transform .22s var(--ease);
}

.page-about details[open] > summary .team-chev,
.page-about details[open] > summary .step-chev {
  transform: rotate(45deg);
  color: var(--gold-lit);
}

.page-about .team-lead {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .team-cell ul {
  margin: 12px 0 0;
  padding: 0 0 0 2px;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .team-cell li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--cool-soft);
}

.page-about .team-cell li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 1px;
  background: var(--gold-hair);
}

/* ---------- 校对流程 ---------- */
.page-about .about-flow {
  padding: clamp(44px, 6vw, 88px) 0;
  background: var(--char);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}

.page-about .flow-grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

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

.page-about .flow-copy .section-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(27px, 4.8vw, 44px);
  line-height: 1.12;
  letter-spacing: -.012em;
  color: var(--paper);
}

.page-about .flow-intro {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cool-soft);
}

.page-about .flow-steps {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  gap: 10px;
}

.page-about .flow-step {
  background: var(--ink);
  border: 1px solid var(--hair);
  padding: 15px 16px 17px;
}

.page-about .flow-step[open] {
  border-color: var(--gold-hair);
}

.page-about .flow-step summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .step-no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--amber);
}

.page-about .step-name {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: .03em;
  color: var(--paper);
}

.page-about .flow-step p {
  margin: 11px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--cool-soft);
}

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

.page-about .flow-line {
  display: block;
  width: 100%;
  height: auto;
  margin: 16px 0 0;
  color: var(--gold-hair);
}

.page-about .flow-note {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.7;
  color: var(--cool);
}

/* ---------- 生态 ---------- */
.page-about .about-eco {
  padding: clamp(44px, 6vw, 88px) 0;
}

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

.page-about .eco-head .section-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(27px, 4.8vw, 46px);
  line-height: 1.1;
  letter-spacing: -.012em;
  color: var(--paper);
}

.page-about .eco-intro {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cool-soft);
}

.page-about .eco-grid {
  list-style: none;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .eco-card {
  background: var(--panel);
  border: 1px solid var(--hair);
  border-top: 3px solid var(--hair-strong);
  padding: 22px 20px 24px;
}

.page-about .eco-card--gold {
  border-top-color: var(--gold);
}

.page-about .eco-card--moss {
  border-top-color: var(--moss);
}

.page-about .eco-card--amber {
  border-top-color: var(--amber);
}

.page-about .eco-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--paper);
}

.page-about .eco-label {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold-lit);
}

.page-about .eco-text {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cool-soft);
}

.page-about .eco-trust {
  margin-top: clamp(24px, 3.4vw, 36px);
  padding: 18px 20px;
  border-left: 2px solid var(--moss);
  background: #14171a;
}

.page-about .eco-trust .mono-label {
  margin: 0 0 8px;
}

.page-about .eco-trust p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cool-soft);
}

/* ---------- 收束 ---------- */
.page-about .about-next {
  padding: 0 0 clamp(52px, 7vw, 100px);
}

.page-about .next-panel {
  position: relative;
  padding: clamp(26px, 4.4vw, 56px);
  background:
    linear-gradient(160deg, rgba(201, 162, 39, .12), rgba(11, 12, 13, 0) 58%),
    var(--panel);
  border: 1px solid var(--gold-hair);
}

.page-about .next-panel::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 72px;
  height: 72px;
  border-right: 2px solid var(--gold-hair);
  border-bottom: 2px solid var(--gold-hair);
  pointer-events: none;
}

.page-about .next-panel .section-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 44px);
  line-height: 1.12;
  letter-spacing: -.012em;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .next-lead {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cool-soft);
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .next-note {
  margin: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  line-height: 1.75;
  color: var(--cool);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .origin-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: none;
    background: transparent;
    gap: 20px;
  }

  .page-about .origin-points li {
    background: transparent;
    padding: 14px 14px 0 0;
    border-top: 2px solid var(--ink);
  }

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

@media (min-width: 880px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .flow-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: start;
  }

  .page-about .ms-track {
    grid-auto-columns: minmax(272px, 1fr);
    scroll-snap-type: x proximity;
  }
}

@media (min-width: 1000px) {
  .page-about .ms-layout {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .ms-index {
    position: sticky;
    top: 104px;
  }

  .page-about .ms-index ul {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    gap: 4px;
  }

  .page-about .ms-index a {
    width: 100%;
    justify-content: flex-start;
    border-color: transparent;
    border-left: 1px solid var(--hair-strong);
    padding: 8px 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ms-card,
  .page-about .ms-index a,
  .page-about .team-chev,
  .page-about .step-chev {
    transition: none;
  }

  .page-about .ms-card:hover,
  .page-about .ms-card:focus-within {
    transform: none;
  }
}

@media print {
  .page-about .ms-index,
  .page-about .about-hero-actions,
  .page-about .next-actions {
    display: none;
  }

  .page-about .about-title,
  .page-about .section-title {
    color: #000;
  }
}