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

/* ---------- 通用块 ---------- */
.page-about .pa-h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 3.6vw, 2.9rem);
  line-height: 1.14;
  letter-spacing: -.01em;
  margin: 0 0 1.5rem;
  max-width: 24ch;
  color: var(--black);
}
.page-about .pa-h2-dark { color: var(--paper); }

.page-about .pa-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--blue-500);
  margin: 0 0 .85rem;
}
.page-about .pa-eyebrow-dark { color: var(--green-300); }

.page-about .grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 4vw, 2.6rem);
}

/* ---------- 首屏 ---------- */
.page-about .pa-hero {
  position: relative;
  background: var(--ink-900);
  color: var(--paper);
  padding: clamp(1.75rem, 4vw, 2.75rem) 0 clamp(3rem, 7vw, 5.5rem);
  overflow: hidden;
}
.page-about .pa-hero-dots {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .55;
}
.page-about .pa-hero-shell { position: relative; z-index: 1; }

.page-about .pa-crumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0 0 clamp(2rem, 6vw, 4rem);
  padding: 0;
  font-size: 13px;
  letter-spacing: .08em;
}
.page-about .pa-crumbs li {
  display: flex;
  align-items: center;
  gap: .5rem;
  color: var(--green-300);
}
.page-about .pa-crumbs li + li::before {
  content: "/";
  color: var(--ink-500);
}
.page-about .pa-crumbs a {
  color: var(--green-300);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color .14s var(--ease), color .14s var(--ease);
}
.page-about .pa-crumbs a:hover {
  color: var(--paper);
  border-bottom-color: var(--green-600);
}

.page-about .pa-hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 6.2vw, 5rem);
  line-height: 1.05;
  letter-spacing: -.02em;
  margin: 0 0 clamp(1.25rem, 3vw, 1.9rem);
  max-width: 15ch;
  color: var(--paper);
}
.page-about .pa-hero-lead {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.85;
  color: rgba(251, 252, 250, .8);
  max-width: 58ch;
  margin: 0 0 clamp(2rem, 5vw, 3rem);
}

.page-about .pa-hero-facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 3rem;
  margin: 0;
  padding: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  border-top: 2px solid var(--ink-500);
  max-width: 62ch;
}
.page-about .pa-hero-facts li {
  display: flex;
  align-items: baseline;
  gap: .5rem;
}
.page-about .pa-fact-num {
  font-family: var(--font-num);
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  letter-spacing: -.02em;
  color: var(--green-600);
  line-height: 1;
}
.page-about .pa-fact-text {
  font-size: .875rem;
  letter-spacing: .04em;
  color: rgba(251, 252, 250, .72);
}

/* ---------- 缘起 ---------- */
.page-about .pa-origin {
  padding: clamp(3.25rem, 8vw, 6.5rem) 0;
  background: var(--paper);
}
.page-about .pa-prose p {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink-700);
  margin: 0 0 1.15rem;
}
.page-about .pa-prose p:last-child { margin-bottom: 0; }

.page-about .pa-note {
  border: 2px solid var(--ink-500);
  background: var(--green-050);
  padding: 1.5rem 1.5rem 1.35rem;
  box-shadow: 8px 8px 0 0 var(--green-600);
}
.page-about .pa-note-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--ink-700);
  margin: 0 0 1rem;
}
.page-about .pa-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: pa-step;
}
.page-about .pa-steps li {
  counter-increment: pa-step;
  display: flex;
  align-items: center;
  gap: .8rem;
  padding: .7rem 0;
  border-bottom: 2px solid var(--green-300);
  font-size: .95rem;
  font-weight: 500;
  color: var(--black);
}
.page-about .pa-steps li:last-child { border-bottom: 0; }
.page-about .pa-steps li::before {
  content: counter(pa-step);
  flex: none;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  background: var(--green-600);
  color: var(--ink-900);
  font-family: var(--font-num);
  font-weight: 800;
  font-size: 13px;
}
.page-about .pa-note-foot {
  margin: 1rem 0 0;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--ink-700);
}

/* ---------- 版本演进 ---------- */
.page-about .pa-evolve {
  background: var(--ink-700);
  color: var(--paper);
  padding: clamp(3.25rem, 8vw, 6rem) 0 clamp(3rem, 7vw, 5rem);
}
.page-about .pa-evolve-lead {
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(251, 252, 250, .74);
  margin: 0;
  max-width: 46ch;
}
.page-about .pa-evolve-figure {
  margin: clamp(2rem, 5vw, 3.25rem) auto;
  padding: 0 var(--gutter);
  max-width: 1400px;
}
.page-about .pa-evolve-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 2px solid var(--ink-500);
  background: var(--ink-900);
}

.page-about .pa-rail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}
.page-about .pa-stage {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .8rem;
  padding: 1.6rem 1.4rem 1.7rem;
  border: 2px solid var(--ink-500);
  background: var(--ink-900);
  transition: border-color .14s var(--ease), box-shadow .14s var(--ease), transform .14s var(--ease);
}
.page-about .pa-stage:hover {
  border-color: var(--green-600);
  box-shadow: 8px 8px 0 0 var(--green-600);
  transform: translate(-4px, -4px);
}
.page-about .pa-stage.is-active {
  border-color: var(--green-600);
  box-shadow: 8px 8px 0 0 var(--green-600);
}
.page-about .pa-dot {
  width: 32px;
  height: 32px;
  padding: 0;
  display: grid;
  place-items: center;
  border: 2px solid var(--green-300);
  background: transparent;
  color: var(--green-300);
  font-family: var(--font-num);
  font-weight: 800;
  font-size: 14px;
  cursor: pointer;
  transition: background .14s var(--ease), border-color .14s var(--ease), color .14s var(--ease);
}
.page-about .pa-dot:hover { border-color: var(--green-600); color: var(--green-600); }
.page-about .pa-dot:focus-visible { outline: 2px solid var(--blue-500); outline-offset: 3px; }
.page-about .pa-dot.is-active {
  background: var(--green-600);
  border-color: var(--green-600);
  color: var(--ink-900);
}
.page-about .pa-stage-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.3;
  margin: 0;
  color: var(--paper);
}
.page-about .pa-stage-text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: rgba(251, 252, 250, .72);
}

/* ---------- 数字面板 ---------- */
.page-about .pa-numbers {
  position: relative;
  background: var(--ink-900);
  color: var(--paper);
  padding: clamp(3.5rem, 10vw, 8rem) 0 clamp(3.5rem, 9vw, 7rem);
  overflow: hidden;
}
.page-about .pa-numbers-dots {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .5;
}
.page-about .pa-numbers .shell { position: relative; z-index: 1; }

.page-about .pa-num-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.6rem;
  margin-top: clamp(2rem, 5vw, 3.25rem);
}
.page-about .pa-num-cell {
  border-top: 2px solid var(--ink-500);
  padding-top: 1.25rem;
}
.page-about .pa-num-value {
  display: flex;
  align-items: baseline;
  gap: .3rem;
  margin: 0 0 .6rem;
  font-family: var(--font-num);
  font-weight: 900;
  font-size: clamp(3.2rem, 11vw, 6.5rem);
  line-height: .88;
  letter-spacing: -.045em;
  color: var(--green-600);
}
.page-about .pa-num-value small {
  font-family: var(--font-body);
  font-size: clamp(.9rem, 2vw, 1.2rem);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--green-300);
}
.page-about .pa-num-label {
  margin: 0 0 .5rem;
  font-size: .9375rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--paper);
}
.page-about .pa-num-note {
  margin: 0;
  font-size: .875rem;
  line-height: 1.75;
  color: rgba(251, 252, 250, .66);
  max-width: 34ch;
  transition: color .14s var(--ease);
}
.page-about .pa-num-cell:hover .pa-num-note { color: rgba(251, 252, 250, .95); }
.page-about .pa-num-cell:hover .pa-num-value { color: var(--green-300); }

.page-about .pa-num-foot {
  margin: clamp(2.5rem, 6vw, 4rem) 0 0;
  padding-top: 1.25rem;
  border-top: 2px solid var(--ink-500);
  font-size: .9375rem;
  line-height: 1.8;
  color: rgba(251, 252, 250, .72);
  max-width: 60ch;
}
.page-about .pa-num-foot a {
  color: var(--blue-300);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color .14s var(--ease);
}
.page-about .pa-num-foot a:hover { border-bottom-color: var(--blue-300); }

/* ---------- 团队 ---------- */
.page-about .pa-team {
  background: var(--paper);
  padding: clamp(3.25rem, 8vw, 6.5rem) 0;
}
.page-about .pa-team-figure {
  margin: 0;
  border: 2px solid var(--ink-500);
  background: var(--green-050);
}
.page-about .pa-team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .pa-roles {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .pa-role {
  display: flex;
  gap: 1.1rem;
  padding: 1.15rem 0;
  border-bottom: 2px solid var(--ink-500);
}
.page-about .pa-role:first-child { padding-top: 0; }
.page-about .pa-role:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .pa-role-count {
  flex: none;
  font-family: var(--font-num);
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--green-600);
  min-width: 2.4ch;
}
.page-about .pa-role-title {
  margin: 0 0 .35rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--black);
}
.page-about .pa-role-body p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--ink-700);
}
.page-about .pa-team-foot {
  margin: clamp(2rem, 5vw, 2.75rem) 0 0;
  padding-left: 1.15rem;
  border-left: 4px solid var(--green-600);
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--ink-700);
  max-width: 62ch;
}

/* ---------- 资质 ---------- */
.page-about .pa-cred {
  background: var(--green-050);
  padding: clamp(3.25rem, 8vw, 6.5rem) 0;
}
.page-about .pa-table {
  width: 100%;
  border-collapse: collapse;
  border: 2px solid var(--ink-500);
  background: var(--paper);
}
.page-about .pa-table th,
.page-about .pa-table td {
  text-align: left;
  padding: 1.05rem 1.15rem;
  font-size: .9rem;
  line-height: 1.7;
  border-bottom: 2px solid var(--ink-500);
  vertical-align: top;
}
.page-about .pa-table tr:last-child th,
.page-about .pa-table tr:last-child td { border-bottom: 0; }
.page-about .pa-table th {
  width: 40%;
  font-weight: 700;
  color: var(--black);
}
.page-about .pa-table td { color: var(--ink-700); }

.page-about .pa-cred-side {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-about .pa-cred-figure {
  margin: 0;
  border: 2px solid var(--ink-500);
  background: var(--paper);
}
.page-about .pa-cred-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}
.page-about .pa-cred-note {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 页尾入口 ---------- */
.page-about .pa-next {
  background: var(--ink-900);
  color: var(--paper);
  padding: clamp(3.25rem, 8vw, 6rem) 0 clamp(3rem, 7vw, 5rem);
}
.page-about .pa-next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}
.page-about .pa-next-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .7rem;
  padding: 1.6rem 1.5rem 2.2rem;
  background: var(--ink-700);
  border: 2px solid var(--ink-500);
  text-decoration: none;
  color: inherit;
  transition: border-color .14s var(--ease), box-shadow .14s var(--ease), transform .14s var(--ease);
}
.page-about .pa-next-card:hover,
.page-about .pa-next-card:focus-visible {
  border-color: var(--green-600);
  box-shadow: 8px 8px 0 0 var(--green-600);
  transform: translate(-4px, -4px);
  outline: none;
}
.page-about .pa-next-kicker {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--green-300);
}
.page-about .pa-next-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.35;
  color: var(--paper);
}
.page-about .pa-next-card p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: rgba(251, 252, 250, .72);
}
.page-about .pa-next-go {
  position: absolute;
  right: 1.4rem;
  bottom: 1.1rem;
  font-family: var(--font-num);
  font-size: 1.1rem;
  color: var(--green-600);
  transition: transform .14s var(--ease);
}
.page-about .pa-next-card:hover .pa-next-go { transform: translateX(4px); }

.page-about .pa-next-foot {
  margin: clamp(2rem, 5vw, 2.75rem) 0 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: rgba(251, 252, 250, .7);
}
.page-about .pa-next-foot a {
  color: var(--green-300);
  text-decoration: none;
  border-bottom: 2px solid var(--green-600);
  transition: color .14s var(--ease);
}
.page-about .pa-next-foot a:hover { color: var(--paper); }

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .pa-num-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(2.5rem, 5vw, 4.5rem);
    row-gap: 3rem;
  }
  .page-about .pa-num-cell:nth-child(2),
  .page-about .pa-num-cell:nth-child(4) { margin-top: 2.75rem; }

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

@media (min-width: 860px) {
  .page-about .pa-rail {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
  }
}

@media (min-width: 900px) {
  .page-about .grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
  .page-about .pa-origin-main { grid-column: 1 / span 7; }
  .page-about .pa-origin-aside { grid-column: 9 / span 4; }
  .page-about .pa-team-grid > .span-5 { grid-column: 1 / span 5; }
  .page-about .pa-team-grid > .span-7 { grid-column: 6 / span 7; }
  .page-about .pa-cred-grid > .span-7 { grid-column: 1 / span 7; }
  .page-about .pa-cred-grid > .span-5 { grid-column: 8 / span 5; }
}

@media (max-width: 899px) {
  .page-about .span-4,
  .page-about .span-5,
  .page-about .span-6,
  .page-about .span-7,
  .page-about .span-8,
  .page-about .span-12 { grid-column: 1 / -1; }
}

@media (max-width: 480px) {
  .page-about .pa-hero-facts { gap: 1rem 1.75rem; }
  .page-about .pa-table th,
  .page-about .pa-table td { padding: .9rem .85rem; font-size: .86rem; }
  .page-about .pa-role { gap: .85rem; }
}