.page-about {
  --about-rule: rgba(185, 216, 212, 0.28);
  --about-rule-soft: rgba(185, 216, 212, 0.14);
  --about-ink-rule: rgba(14, 21, 26, 0.22);
  color: var(--cream);
  background:
    radial-gradient(115% 55% at 92% -10%, rgba(24, 224, 207, 0.16), transparent 62%),
    linear-gradient(180deg, var(--ink-900) 0%, #05141F 100%);
  overflow-x: hidden;
}

.page-about .container {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 30px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .breadcrumb-link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb-current {
  color: var(--cyan-soft);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--rock);
}

/* ---------- hero ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  padding-block: clamp(26px, 4vw, 54px) clamp(38px, 6vw, 80px);
  border-bottom: 2px solid var(--about-rule-soft);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about h1.display {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(33px, 6vw, 78px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .lede {
  max-width: 66ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero-panel {
  border: 2px solid var(--about-rule);
  background: linear-gradient(160deg, var(--ink-800), rgba(7, 28, 44, 0.92));
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 2.6vw, 28px);
  position: relative;
}

.page-about .about-hero-panel::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 22px;
  height: 22px;
  background: var(--cyan);
}

.page-about .panel-kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-soft);
}

.page-about .panel-stats {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .panel-stats li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--about-rule-soft);
}

.page-about .panel-stats li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .panel-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 3vw, 30px);
  color: var(--cyan);
  line-height: 1;
  min-width: 74px;
}

.page-about .panel-label {
  font-size: 14px;
  line-height: 1.5;
  color: var(--cream);
}

.page-about .panel-note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- bands ---------- */
.page-about .about-band {
  padding-block: clamp(38px, 5.5vw, 84px);
  border-top: 2px solid var(--about-rule-soft);
}

.page-about .about-band--cream {
  background: var(--cream);
  color: var(--coal);
}

.page-about .about-band--cream .eyebrow {
  color: var(--clay);
}

.page-about .about-band--sea {
  background: linear-gradient(180deg, var(--sea), var(--ink-800));
}

.page-about .about-head {
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-about .section-title {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 44px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-band--cream .section-title {
  color: var(--coal);
}

.page-about .about-band--cream .lede {
  color: #3A464C;
}

.page-about .about-text {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: #2B363C;
}

.page-about .about-text:last-of-type {
  margin-bottom: 0;
}

/* ---------- intro ---------- */
.page-about .intro-grid {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}

.page-about .code-legend {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .code-legend li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  align-items: baseline;
  padding: 12px 14px;
  border: 2px solid var(--about-ink-rule);
  background: #FBF7EF;
  font-size: 14.5px;
  line-height: 1.6;
  color: #2B363C;
}

.page-about .code-legend .mono {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--clay);
  min-width: 52px;
}

.page-about .media-frame {
  margin: 0;
  border: 2px solid var(--about-rule);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-band--cream .media-frame {
  border-color: var(--about-ink-rule);
  box-shadow: 6px 6px 0 rgba(14, 21, 26, 0.16);
}

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

.page-about .media-caption {
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  line-height: 1.6;
  color: var(--mist);
  border-top: 2px solid var(--about-rule-soft);
}

.page-about .about-band--cream .media-caption {
  color: #46545A;
  border-top-color: var(--about-ink-rule);
}

/* ---------- axis board ---------- */
.page-about .axis-board {
  display: grid;
  gap: 16px;
}

.page-about .axis-col {
  border: 2px solid var(--about-rule);
  background: rgba(12, 42, 64, 0.72);
  box-shadow: var(--shadow-hard);
  padding: clamp(16px, 2.4vw, 26px);
}

.page-about .axis-label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-soft);
}

.page-about .axis-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .axis-list li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding-bottom: 9px;
  border-bottom: 1px dashed var(--about-rule-soft);
  font-size: 15px;
  line-height: 1.5;
  color: var(--cream);
}

.page-about .axis-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .axis-list .mono {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--coral);
  min-width: 46px;
}

.page-about .axis-summary {
  display: grid;
  gap: 12px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 2px solid var(--about-rule-soft);
}

.page-about .axis-total {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .axis-note {
  margin: 0;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- timeline ---------- */
.page-about .tl-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(228px, 82%);
  gap: 14px;
  overflow-x: auto;
  padding: 4px 4px 20px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .tl-item {
  scroll-snap-align: start;
  border: 2px solid var(--about-rule);
  background: rgba(7, 28, 44, 0.78);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .tl-item summary {
  display: grid;
  gap: 8px;
  padding: 16px 16px 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-item summary::after {
  content: "展开 +";
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--rock);
}

.page-about .tl-item[open] summary::after {
  content: "收起 −";
  color: var(--cyan);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .tl-title {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--cream);
}

.page-about .tl-item p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .tl-item[open] {
  border-color: var(--cyan);
  box-shadow: 6px 6px 0 rgba(3, 12, 18, 0.5);
}

.page-about .tl-figure {
  margin-top: clamp(22px, 3vw, 34px);
}

/* ---------- team ---------- */
.page-about .team-grid {
  display: grid;
  gap: 14px;
}

.page-about .team-card {
  border: 2px solid var(--about-ink-rule);
  background: #FBF7EF;
  box-shadow: 6px 6px 0 rgba(14, 21, 26, 0.14);
}

.page-about .team-card summary {
  display: flex;
  gap: 14px;
  align-items: center;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .team-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 22px;
  line-height: 1;
  color: var(--clay);
  min-width: 40px;
}

.page-about .team-name {
  flex: 1;
  font-size: 16px;
  font-weight: 700;
  color: var(--coal);
}

.page-about .team-plus {
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
}

.page-about .team-plus::before,
.page-about .team-plus::after {
  content: "";
  position: absolute;
  background: var(--clay);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.page-about .team-plus::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-about .team-plus::after {
  top: 0;
  left: 6px;
  width: 2px;
  height: 14px;
}

.page-about .team-card[open] .team-plus::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .team-card[open] {
  border-color: var(--moss);
}

.page-about .team-card p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14.5px;
  line-height: 1.75;
  color: #2B363C;
}

.page-about .check-band {
  display: grid;
  gap: 12px;
  margin: clamp(24px, 3.2vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .check-item {
  padding: 12px 0 12px 16px;
  border-left: 4px solid var(--moss);
  background: linear-gradient(90deg, rgba(92, 122, 98, 0.16), transparent);
}

.page-about .check-item span {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--moss);
}

.page-about .check-item p {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: #2B363C;
}

.page-about .team-figure {
  margin-top: clamp(24px, 3.2vw, 40px);
}

/* ---------- ecosystem ---------- */
.page-about .eco-map {
  display: grid;
  gap: 18px;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .eco-node {
  border: 2px solid var(--about-rule);
  background: rgba(12, 42, 64, 0.72);
  padding: clamp(16px, 2.2vw, 24px);
}

.page-about .eco-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-soft);
}

.page-about .eco-num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1;
  color: var(--coral);
}

.page-about .eco-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .eco-hub {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  justify-self: center;
  width: 100%;
}

.page-about .eco-hub span {
  display: block;
  padding: 10px 16px;
  background: var(--cyan);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  line-height: 1.4;
  text-align: center;
}

.page-about .eco-hub::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -18px;
  bottom: -18px;
  border-left: 2px dashed var(--about-rule);
}

.page-about .eco-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  padding-top: 20px;
  border-top: 2px solid var(--about-rule-soft);
}

.page-about .eco-tags-note {
  flex: 1 1 100%;
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- coverage ---------- */
.page-about .coverage-grid {
  display: grid;
  gap: clamp(24px, 3.2vw, 42px);
}

.page-about .cov-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .cov-item {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--about-ink-rule);
}

.page-about .cov-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  color: var(--clay);
  min-width: 96px;
}

.page-about .cov-label {
  flex: 1 1 220px;
  font-size: 14.5px;
  line-height: 1.7;
  color: #2B363C;
}

.page-about .start-title {
  margin: 0 0 14px;
  font-size: 16px;
  font-weight: 700;
  color: var(--coal);
}

.page-about .start-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .start-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 16px;
  border: 2px solid var(--about-ink-rule);
  background: #FBF7EF;
  color: var(--coal);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .start-list a::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--clay);
}

.page-about .start-list a:hover,
.page-about .start-list a:focus-visible {
  transform: translate(-3px, -3px);
  background: var(--cyan-soft);
  border-color: var(--ink-900);
}

.page-about .start-note {
  margin: 16px 0;
  font-size: 14px;
  line-height: 1.75;
  color: #3A464C;
}

.page-about .start-list a:focus-visible,
.page-about .breadcrumb-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- responsive ---------- */
@media (min-width: 640px) {
  .page-about .axis-summary {
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 24px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    align-items: end;
  }

  .page-about .intro-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .axis-board {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .tl-track {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-columns: auto;
    overflow: visible;
    padding-bottom: 4px;
    scroll-snap-type: none;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .eco-map {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 26px;
  }

  .page-about .eco-hub::before {
    top: 50%;
    left: -26px;
    right: -26px;
    bottom: auto;
    border-left: 0;
    border-top: 2px dashed var(--about-rule);
  }

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero-panel {
    padding: 32px;
  }

  .page-about .panel-num {
    min-width: 88px;
  }
}
<<<END>>>