.page-about {
  display: block;
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  padding: clamp(20px, 4vw, 40px) 0 clamp(32px, 5vw, 64px);
}

@media (min-width: 920px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: center;
    gap: clamp(36px, 5vw, 76px);
  }
}

.page-about .hero-frame {
  position: relative;
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background:
    radial-gradient(115% 90% at 4% 0%, var(--cyan-soft), transparent 58%),
    linear-gradient(158deg, var(--moss) 0%, var(--ink) 72%);
  overflow: hidden;
}

.page-about .hero-frame::before {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid rgba(61, 242, 208, 0.16);
  border-radius: calc(var(--radius-l) - 10px);
  pointer-events: none;
}

.page-about .hero-frame::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 76px;
  height: 76px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--line) 0,
    var(--line) 1px,
    transparent 1px,
    transparent 8px
  );
  opacity: 0.55;
  pointer-events: none;
}

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

.page-about h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: var(--mist);
}

.page-about .lede {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--sage);
}

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

.page-about .signal-row {
  list-style: none;
  margin: 32px 0 0;
  padding: 1px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border-top: 1px solid var(--line);
}

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

.page-about .signal-row li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 14px 4px 0;
  border-right: 1px solid var(--line);
}

.page-about .signal-row li:last-child {
  border-right: 0;
}

.page-about .sig-num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .sig-plus {
  font-size: 0.62em;
  color: var(--sage);
  margin-left: 2px;
}

.page-about .sig-label {
  font-size: 13px;
  color: var(--sage);
  letter-spacing: 0.02em;
}

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

.page-about .hero-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--sage);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  position: relative;
  padding: clamp(40px, 6.5vw, 84px) 0;
  border-top: 1px solid var(--line);
}

.page-about .chapter-head {
  margin-bottom: clamp(22px, 3.5vw, 38px);
}

.page-about .chapter-no {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .chapter h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.2vw, 2.35rem);
  line-height: 1.24;
  letter-spacing: 0.015em;
  color: var(--mist);
  max-width: 22ch;
}

.page-about .chapter h3 {
  margin: 0 0 8px;
  font-size: clamp(1rem, 1.8vw, 1.12rem);
  font-weight: 600;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .chapter p {
  margin: 0 0 15px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--sage);
}

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

.page-about .section-lede {
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px) !important;
  color: var(--mist) !important;
  opacity: 0.86;
  margin-bottom: clamp(22px, 3vw, 34px) !important;
}

.page-about .chapter-foot {
  margin-top: clamp(20px, 3vw, 32px);
  padding-left: 14px;
  border-left: 2px solid var(--cyan-dim);
  font-size: 14px;
  color: var(--sage);
}

.page-about .chapter-foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-dim);
  transition: border-color var(--tr), color var(--tr);
}

.page-about .chapter-foot a:hover,
.page-about .chapter-foot a:focus-visible {
  border-bottom-color: var(--cyan);
  color: var(--mist);
}

/* ---------- 01 起点 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
}

@media (min-width: 900px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

.page-about .origin-copy p {
  max-width: 58ch;
}

.page-about .origin-figure {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(200deg, var(--turf), var(--ink) 80%);
}

.page-about .stand-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .stand-step {
  fill: none;
  stroke: var(--cyan-dim);
  stroke-width: 1.6;
  stroke-linejoin: round;
}

.page-about .stand-turf {
  fill: none;
  stroke: var(--gold);
  stroke-width: 2;
  opacity: 0.75;
}

.page-about .stand-turf--thin {
  stroke: var(--line);
  stroke-width: 1;
  opacity: 0.9;
}

.page-about .stand-seats circle {
  fill: var(--slate);
  opacity: 0.85;
}

.page-about .stand-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  fill: var(--sage);
}

.page-about .figure-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--sage);
}

/* ---------- 02 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
}

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: start;
  }
}

.page-about .team-copy p {
  max-width: 60ch;
}

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

.page-about .team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}

.page-about .flow-wrap {
  margin-top: clamp(30px, 4vw, 46px);
  padding: clamp(20px, 3vw, 30px) clamp(16px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(150deg, var(--moss), var(--ink) 78%);
}

.page-about .flow-caption {
  margin: 0 0 12px !important;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sage) !important;
}

.page-about .flow-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .flow-track {
  stroke: var(--line);
  stroke-width: 1.5;
  stroke-dasharray: 5 5;
}

.page-about .flow-step circle {
  fill: var(--ink);
  stroke: var(--cyan-dim);
  stroke-width: 1.5;
}

.page-about .flow-step--accent circle {
  stroke: var(--gold);
  fill: var(--gold-soft);
}

.page-about .flow-index {
  font-family: var(--font-mono);
  font-size: 14px;
  fill: var(--cyan);
  text-anchor: middle;
}

.page-about .flow-step--accent .flow-index {
  fill: var(--gold);
}

.page-about .flow-name {
  font-size: 13px;
  fill: var(--sage);
  text-anchor: middle;
}

/* ---------- 03 历程 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan-dim), var(--line) 62%, transparent);
  border-radius: 2px;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 32px) 34px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--ink);
}

.page-about .tl-item--current::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px var(--cyan-soft);
}

.page-about .tl-version {
  display: inline-block;
  margin: 0 0 8px;
  padding: 3px 10px;
  border: 1px solid var(--gold-soft);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
  background: rgba(230, 180, 90, 0.06);
}

.page-about .tl-item--current .tl-version {
  border-color: var(--cyan-dim);
  color: var(--cyan);
  background: var(--cyan-soft);
}

.page-about .tl-item p {
  max-width: 66ch;
  font-size: 15px;
}

/* ---------- 04 地域 ---------- */
.page-about .region-band {
  display: grid;
  gap: clamp(22px, 3.5vw, 42px);
  padding: clamp(22px, 3.5vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(122, 46, 53, 0.18), transparent 62%),
    linear-gradient(120deg, var(--turf), var(--moss) 65%, var(--ink));
}

@media (min-width: 900px) {
  .page-about .region-band {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }
}

.page-about .region-copy p {
  max-width: 56ch;
  color: var(--mist);
  opacity: 0.88;
}

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

.page-about .region-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}

/* ---------- 05 共建 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 640px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .partner-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 22px 20px;
}

.page-about .partner-card h3 {
  margin: 0;
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .partner-meta {
  margin-top: auto !important;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px !important;
  letter-spacing: 0.06em;
  color: var(--cyan) !important;
  opacity: 0.85;
}

/* ---------- 06 凭据与收束 ---------- */
.page-about .credential-grid {
  display: grid;
  gap: 1px;
  grid-template-columns: minmax(0, 1fr);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--line);
  overflow: hidden;
}

@media (min-width: 640px) {
  .page-about .credential-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .credential-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .credential {
  padding: 24px 22px;
  background: var(--ink);
}

.page-about .credential-value {
  margin: 0 0 8px !important;
  font-size: clamp(15px, 2vw, 18px);
  font-weight: 600;
  color: var(--mist) !important;
  line-height: 1.45;
}

.page-about .credential-value.num {
  font-family: var(--font-mono);
  color: var(--cyan) !important;
  letter-spacing: 0.02em;
}

.page-about .credential-label {
  margin: 0 !important;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--sage) !important;
}

.page-about .closing-band {
  margin-top: clamp(28px, 4vw, 48px);
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: linear-gradient(135deg, var(--moss), var(--ink) 70%);
  position: relative;
  overflow: hidden;
}

.page-about .closing-band::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan), var(--gold));
}

.page-about .closing-text {
  margin: 0 0 22px !important;
  max-width: 64ch;
  font-size: clamp(15px, 1.8vw, 17px);
  color: var(--mist) !important;
  opacity: 0.9;
}

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

/* ---------- 降级与无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-foot a {
    transition: none;
  }
}

.page-about a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius-s);
}