.page-about {
  --about-line: rgba(147, 163, 174, 0.28);
  --about-line-strong: rgba(147, 163, 174, 0.5);
  --about-ink-line: rgba(16, 20, 24, 0.16);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 40px) 0 clamp(52px, 8vw, 92px);
  background: var(--ink-900);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(142deg, var(--navy-800) 0%, var(--navy-700) 36%, var(--ink-900) 82%);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 0 98%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: clamp(-90px, -8vw, -50px);
  right: clamp(-90px, -6vw, -40px);
  width: clamp(180px, 34vw, 440px);
  height: clamp(150px, 26vw, 320px);
  background: var(--teal-jewel);
  transform: rotate(-8deg);
  box-shadow: -10px 12px 0 rgba(0, 0, 0, 0.4);
  pointer-events: none;
}

.page-about .hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .hero-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0;
}

.page-about .hero-title {
  margin: 18px 0 0;
  max-width: 15em;
  font-size: clamp(34px, 6.2vw, 74px);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .hero-lead {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--mist-b);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(28px, 4vw, 40px);
  max-width: 760px;
}

.page-about .stat {
  border: 2px solid var(--about-line-strong);
  background: rgba(8, 19, 31, 0.62);
  padding: 14px 16px;
  box-shadow: var(--shadow-sm);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(28px, 4vw, 40px);
}

/* ---------- 通用章节头 ---------- */
.page-about .sec-head {
  margin-bottom: clamp(24px, 4vw, 40px);
  max-width: 44em;
}

.page-about .sec-eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--wine-jewel);
}

.page-about .sec-eyebrow--cyan { color: var(--cyan); }
.page-about .sec-eyebrow--amber { color: var(--amber); }

.page-about .sec-title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 40px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--graphite);
}

.page-about .sec-title--light { color: var(--paper); }

.page-about .sec-lead {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(16, 20, 24, 0.72);
}

.page-about .sec-lead--light { color: var(--mist-b); }

.page-about .sec-text {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(16, 20, 24, 0.76);
}

.page-about .sec-head--center {
  max-width: 48em;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.page-about .sec-head--center .sec-lead { margin-left: auto; margin-right: auto; }

/* ---------- 发展脉络 ---------- */
.page-about .about-timeline {
  background: var(--ink-900);
  padding-top: 0;
}

.page-about .timeline-board {
  padding: clamp(24px, 4vw, 48px);
  --cut: 16px;
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 6px;
  bottom: 10px;
  width: 2px;
  background: var(--about-ink-line);
}

.page-about .tl-item {
  position: relative;
  padding-left: 46px;
  padding-bottom: 22px;
}

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

.page-about .tl-node {
  position: absolute;
  left: 0;
  top: 2px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--graphite);
  background: var(--paper);
  border: 2px solid var(--graphite);
}

.page-about .tl-item--now .tl-node {
  background: var(--amber);
  border-color: var(--graphite);
  color: var(--graphite);
}

.page-about .tl-card {
  border: 2px solid var(--about-ink-line);
  background: #FFFFFF;
  padding: 16px 18px;
  box-shadow: 4px 4px 0 rgba(16, 20, 24, 0.10);
}

.page-about .tl-stage {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--wine-jewel);
}

.page-about .tl-title {
  margin: 8px 0 0;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--graphite);
}

.page-about .tl-text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(16, 20, 24, 0.74);
}

.page-about .tl-more { margin-top: 12px; }

.page-about .tl-more summary {
  cursor: pointer;
  list-style: none;
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: #146b62;
  border-bottom: 2px solid var(--cyan);
  padding-bottom: 2px;
}

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

.page-about .tl-more summary::before {
  content: "+ ";
  color: var(--amber);
}

.page-about .tl-more[open] summary::before { content: "− "; }

.page-about .tl-more p {
  margin: 10px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--amber);
  font-size: 13px;
  line-height: 1.8;
  color: rgba(16, 20, 24, 0.66);
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-cover {
  background: var(--ink-900);
  padding-top: clamp(40px, 6vw, 72px);
}

.page-about .cover-grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .cover-copy .sec-text { color: var(--mist-b); }

.page-about .cover-list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .cover-list li {
  position: relative;
  padding-left: 30px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist-b);
}

.page-about .cover-list li::before {
  counter-increment: cov;
  content: "0" counter(cov);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .cover-list { counter-reset: cov; }

.page-about .cover-list strong {
  color: var(--paper);
  font-weight: 700;
  margin-right: 4px;
}

.page-about .hint {
  margin: 20px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .cover-visual {
  border: 2px solid var(--about-line-strong);
  background: var(--navy-800);
  padding: 18px;
  box-shadow: var(--shadow);
}

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

.page-about .cover-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 14px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist-b);
}

.page-about .cover-legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.page-about .legend-dot {
  width: 8px;
  height: 8px;
  display: inline-block;
}

.page-about .legend-dot--cyan { background: var(--cyan); }
.page-about .legend-dot--amber { background: var(--amber); }

.page-about .cover-figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
  border: 2px solid var(--about-line-strong);
  background: var(--navy-800);
  box-shadow: var(--shadow);
}

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

.page-about .cover-figure figcaption {
  padding: 14px 18px;
  font-size: 12px;
  line-height: 1.75;
  color: var(--slate);
  border-top: 2px solid var(--about-line);
}

/* ---------- 案例归档 ---------- */
.page-about .about-cases {
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--navy-800) 100%);
}

.page-about .cases-head {
  display: grid;
  gap: 24px;
  margin-bottom: clamp(22px, 3vw, 32px);
}

.page-about .cases-head-media {
  border: 2px solid rgba(63, 214, 196, 0.3);
  box-shadow: var(--shadow-cyan);
  overflow: hidden;
}

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

.page-about .case-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .case-filter {
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1;
  padding: 9px 15px;
  cursor: pointer;
  color: var(--mist-b);
  background: transparent;
  border: 2px solid rgba(63, 214, 196, 0.34);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.35);
  transition: background 120ms var(--ease), color 120ms var(--ease), border-color 120ms var(--ease);
}

.page-about .case-filter:hover:not([aria-pressed="true"]) {
  border-color: var(--cyan);
  color: var(--paper);
}

.page-about .case-filter[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
  font-weight: 700;
}

.page-about .case-filter:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .case-filter [data-filter-count] {
  font-family: var(--font-mono);
  font-size: 11px;
  margin-left: 4px;
  opacity: 0.75;
}

.page-about .case-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  align-items: start;
}

.page-about .case-card {
  position: relative;
  background: var(--teal-jewel);
  border: 2px solid rgba(63, 214, 196, 0.26);
  box-shadow: var(--shadow);
  padding: 18px;
  color: var(--paper);
  transition: border-color 180ms var(--ease);
}

.page-about .case-card:hover { border-color: var(--cyan); }

.page-about .case-card.is-filtered-out { display: none; }
.page-about .case-card.is-flash { animation: aboutFade 120ms var(--ease) both; }

@keyframes aboutFade {
  from { opacity: 0; }
  to { opacity: 1; }
}

.page-about .case-bar {
  height: 4px;
  background: linear-gradient(90deg, var(--mist-a), var(--mist-b));
  margin-bottom: 14px;
}

.page-about .case-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about .case-no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist-b);
  border-bottom: 2px solid var(--cyan);
  padding-bottom: 2px;
}

.page-about .tag--wine {
  background: var(--wine-jewel);
  color: var(--paper);
  border-color: rgba(244, 241, 234, 0.34);
}

.page-about .case-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .case-line {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist-b);
}

.page-about .case-more { margin-top: 12px; }

.page-about .case-more summary {
  cursor: pointer;
  list-style: none;
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  border-bottom: 2px solid var(--cyan-line);
  padding-bottom: 2px;
}

.page-about .case-more summary::-webkit-details-marker { display: none; }
.page-about .case-more summary::before { content: "+ "; color: var(--amber); }
.page-about .case-more[open] summary::before { content: "− "; }

.page-about .case-more p {
  margin: 12px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--amber);
  font-size: 13px;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .cases-foot {
  margin: 30px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .cases-foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid var(--cyan-line);
}

.page-about .cases-foot a:hover { border-bottom-color: var(--cyan); }

/* ---------- 团队与生态 ---------- */
.page-about .about-team {
  background: var(--ink-900);
}

.page-about .team-board {
  padding: clamp(22px, 4vw, 44px);
  --cut: 16px;
}

.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 3.5vw, 40px);
  align-items: start;
}

.page-about .team-media {
  border: 2px solid var(--about-ink-line);
  box-shadow: 5px 5px 0 rgba(16, 20, 24, 0.12);
  overflow: hidden;
  background: var(--navy-800);
}

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

.page-about .team-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 24px 0 0;
}

.page-about .team-stat {
  border: 2px solid var(--about-ink-line);
  background: #FFFFFF;
  padding: 14px 16px;
  box-shadow: 4px 4px 0 rgba(16, 20, 24, 0.08);
}

.page-about .team-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 36px);
  line-height: 1;
  color: var(--wine-jewel);
  border-bottom: 2px solid var(--amber);
  padding-bottom: 6px;
  margin-bottom: 8px;
}

.page-about .team-unit {
  display: block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(16, 20, 24, 0.6);
}

.page-about .team-list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
  counter-reset: team;
}

.page-about .team-list li {
  position: relative;
  padding-left: 30px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(16, 20, 24, 0.76);
}

.page-about .team-list li::before {
  counter-increment: team;
  content: "0" counter(team);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: #146b62;
}

.page-about .team-list strong {
  color: var(--graphite);
  margin-right: 4px;
}

.page-about .team-links {
  margin: 22px 0 0;
  font-size: 13px;
  line-height: 1.85;
  color: rgba(16, 20, 24, 0.66);
  border-top: 2px solid var(--about-ink-line);
  padding-top: 16px;
}

.page-about .team-links a {
  color: #146b62;
  text-decoration: none;
  border-bottom: 2px solid var(--cyan);
}

/* ---------- 上线与保障 ---------- */
.page-about .about-launch {
  background: var(--ink-900);
  padding-top: 0;
}

.page-about .launch-grid {
  display: grid;
  gap: 16px;
}

.page-about .launch-card {
  position: relative;
  border: 2px solid var(--about-line-strong);
  background: var(--navy-800);
  padding: 22px 20px 20px;
  box-shadow: var(--shadow);
}

.page-about .launch-index {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-900);
  background: var(--amber);
  margin-bottom: 14px;
}

.page-about .launch-title {
  margin: 0;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .launch-text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist-b);
}

.page-about .launch-tag {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 2px solid var(--about-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .launch-note {
  display: grid;
  gap: 20px;
  align-items: center;
  margin-top: clamp(24px, 4vw, 36px);
  padding: clamp(20px, 3vw, 30px);
  border: 2px solid var(--amber-line);
  background: var(--indigo-jewel);
  box-shadow: var(--shadow);
}

.page-about .launch-note .quote-line {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.86);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  background: var(--indigo-jewel);
  padding: clamp(44px, 6vw, 76px) 0;
  border-top: 2px solid rgba(63, 214, 196, 0.28);
}

.page-about .cta-inner {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-about .cta-kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .cta-title {
  margin: 0;
  font-size: clamp(22px, 3.4vw, 36px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .cta-text {
  margin: 16px 0 0;
  max-width: 38em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist-b);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .hero-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .team-stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .launch-note { grid-template-columns: 1fr auto; }
}

@media (min-width: 820px) {
  .page-about .cover-grid { grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); }
  .page-about .cases-head { grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr); align-items: start; }
  .page-about .case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 22px; }
  .page-about .case-card:nth-child(even) { margin-top: 34px; }
  .page-about .team-grid { grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); }
  .page-about .launch-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .cta-inner { grid-template-columns: minmax(0, 1.5fr) auto; }
}

@media (min-width: 1040px) {
  .page-about .timeline-board { padding: clamp(36px, 4vw, 56px) clamp(36px, 4vw, 64px); }
  .page-about .tl-item { padding-left: 56px; }
  .page-about .tl::before { left: 15px; }
  .page-about .tl-node { width: 32px; height: 32px; font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .case-card.is-flash { animation: none; }
  .page-about .case-filter,
  .page-about .case-card { transition: none; }
}
<<<PAGE_CSS_END>>>