.page-about {
  --about-hair: rgba(174, 184, 182, 0.22);
  --about-mint-line: rgba(40, 240, 184, 0.45);
  --about-card-bg: #1a2123;
  --about-deep-bg: #12211e;
  color: var(--mist);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 18px 0 4px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 12px;
  color: var(--chalk);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 6px;
  color: var(--steel);
}

.page-about .breadcrumb-link {
  color: var(--chalk);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .breadcrumb-link:hover {
  color: var(--mint);
  border-bottom-color: var(--mint);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  padding: 14px 0 52px;
}

.page-about .about-intro-grid {
  display: grid;
  gap: 30px;
}

.page-about .about-intro-copy h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 8.4vw, 64px);
  line-height: 1.06;
  letter-spacing: 0.045em;
  color: var(--mist);
  margin: 12px 0 18px;
}

.page-about .about-intro-copy h1 em {
  font-style: normal;
  color: var(--mint);
  box-shadow: inset 0 -0.16em 0 rgba(40, 240, 184, 0.22);
}

.page-about .about-lead {
  font-size: 15px;
  line-height: 1.9;
  color: var(--chalk);
  max-width: 60ch;
  margin: 0 0 24px;
}

.page-about .about-intro-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}

.page-about .about-meta-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--about-hair);
  border-radius: 999px;
  background: rgba(36, 43, 45, 0.6);
}

.page-about .about-meta-item .mono {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--mint);
}

.page-about .about-meta-item .figure-label {
  font-size: 12px;
  color: var(--chalk);
}

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

.page-about .about-intro-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-hair);
  aspect-ratio: 4 / 5;
  background: var(--concrete);
}

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

/* ---------- 轨道与定位 ---------- */
.page-about .about-position {
  padding: 52px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-position-grid {
  display: grid;
  gap: 14px;
  margin: 14px 0 30px;
}

.page-about .about-position-num {
  font-family: var(--font-mono);
  font-size: clamp(58px, 17vw, 124px);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1px var(--about-mint-line);
}

.page-about .about-position-text h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 5.6vw, 40px);
  line-height: 1.18;
  letter-spacing: 0.05em;
  color: var(--mist);
  margin: 0 0 16px;
}

.page-about .about-position-text p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--chalk);
  margin: 0 0 14px;
  max-width: 66ch;
}

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

.page-about .about-position-list {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-position-list li {
  background: var(--concrete);
  padding: 18px 20px;
  display: grid;
  gap: 6px;
}

.page-about .about-position-list .mono {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--mint);
}

.page-about .about-position-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--chalk);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: 52px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-team h2,
.page-about .about-content h2,
.page-about .about-network h2,
.page-about .about-rhythm h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 5.6vw, 40px);
  line-height: 1.18;
  letter-spacing: 0.05em;
  color: var(--mist);
  margin: 12px 0 0;
}

.page-about .about-section-lead {
  font-size: 15px;
  line-height: 1.9;
  color: var(--chalk);
  max-width: 66ch;
  margin: 14px 0 28px;
}

.page-about .about-team-figure {
  margin: 0 0 26px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: var(--concrete);
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

.page-about .about-team-figure figcaption {
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--steel);
  border-top: 1px solid var(--about-hair);
}

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

.page-about .about-team-card {
  background: var(--about-card-bg);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .3s var(--ease);
}

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

.page-about .about-team-card summary {
  list-style: none;
  cursor: pointer;
  padding: 20px;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num name"
    "num role";
  align-items: center;
  gap: 2px 16px;
}

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

.page-about .about-team-card summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: -2px;
}

.page-about .about-team-num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--mint);
}

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

.page-about .about-team-name {
  grid-area: name;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.07em;
  color: var(--mist);
}

.page-about .about-team-role {
  grid-area: role;
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel);
}

.page-about .about-team-detail {
  padding: 16px 20px 20px;
  border-top: 1px solid var(--about-hair);
  background: rgba(15, 59, 51, 0.28);
}

.page-about .about-team-detail p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--chalk);
}

/* ---------- 内容体系 ---------- */
.page-about .about-content {
  padding: 52px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-content-grid {
  display: grid;
  gap: 24px;
}

.page-about .about-content-levels {
  display: grid;
  gap: 12px;
}

.page-about .about-level {
  padding: 18px 20px;
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--about-mint-line);
  border-radius: 4px var(--radius) var(--radius) 4px;
  background: linear-gradient(120deg, rgba(36, 43, 45, 0.9), rgba(11, 15, 16, 0.4));
}

.page-about .about-level-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--pulse);
  padding: 3px 9px;
  border: 1px solid rgba(255, 200, 87, 0.35);
  border-radius: 999px;
  margin-bottom: 10px;
}

.page-about .about-level h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--mist);
  margin: 0 0 8px;
}

.page-about .about-level p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--chalk);
}

.page-about .about-content-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: var(--concrete);
}

.page-about .about-content-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 14 / 9;
}

.page-about .about-content-figure figcaption {
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--steel);
  border-top: 1px solid var(--about-hair);
}

/* ---------- 协作网络 ---------- */
.page-about .about-network {
  padding: 52px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-network-grid {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-about .about-network-map {
  padding: 10px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  background:
    linear-gradient(rgba(174, 184, 182, 0.06) 1px, transparent 1px) 0 0 / 100% 26px,
    linear-gradient(90deg, rgba(174, 184, 182, 0.06) 1px, transparent 1px) 0 0 / 26px 100%,
    var(--about-deep-bg);
}

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

.page-about .about-region-lines path {
  fill: none;
  stroke: var(--about-hair);
  stroke-width: 1.5;
  stroke-dasharray: 5 5;
}

.page-about .about-region-node {
  cursor: default;
}

.page-about .about-region-node circle {
  fill: #16332d;
  stroke: var(--about-mint-line);
  stroke-width: 1.5;
  transition: fill .25s var(--ease), stroke .25s var(--ease);
}

.page-about .about-region-node text {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  fill: var(--mist);
  text-anchor: middle;
  pointer-events: none;
  transition: fill .25s var(--ease);
}

.page-about .about-region-node:hover circle {
  fill: var(--mint);
  stroke: var(--mint);
}

.page-about .about-region-node:hover text {
  fill: var(--ink);
}

.page-about .about-network-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-region-item {
  background: var(--concrete);
  padding: 14px 18px;
  display: grid;
  gap: 4px;
  transition: background .25s var(--ease);
}

.page-about .about-region-item:hover {
  background: #2b3437;
}

.page-about .about-region-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--mint);
}

.page-about .about-region-item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--chalk);
}

/* ---------- 版本节奏 ---------- */
.page-about .about-rhythm {
  padding: 52px 0;
  border-top: 1px solid var(--about-hair);
}

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

.page-about .about-rhythm-item {
  position: relative;
  padding: 0 0 26px 26px;
  border-left: 1px solid var(--about-hair);
}

.page-about .about-rhythm-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(40, 240, 184, 0.14);
}

.page-about .about-rhythm-item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-rhythm-stage {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--signal);
  padding: 3px 9px;
  border-radius: 3px;
  background: var(--signal-soft);
  margin-bottom: 8px;
}

.page-about .about-rhythm-item h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--mist);
  margin: 0 0 8px;
}

.page-about .about-rhythm-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--chalk);
  max-width: 64ch;
}

/* ---------- 联系入口 ---------- */
.page-about .about-contact {
  padding: 52px 0 64px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-contact-panel {
  padding: 28px 22px;
  border-radius: calc(var(--radius) + 8px);
  border: 1px solid var(--about-mint-line);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(40, 240, 184, 0.14), transparent 58%),
    linear-gradient(155deg, #17211f 0%, #0d1a17 100%);
}

.page-about .about-contact-panel h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 5.6vw, 38px);
  line-height: 1.18;
  letter-spacing: 0.05em;
  color: var(--mist);
  margin: 12px 0 14px;
}

.page-about .about-contact-lead {
  font-size: 15px;
  line-height: 1.9;
  color: var(--chalk);
  margin: 0 0 24px;
  max-width: 62ch;
}

.page-about .about-contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}

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

.page-about .about-contact-list li {
  display: grid;
  gap: 3px;
}

.page-about .about-contact-list li + li {
  padding-top: 14px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-contact-list .contact-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .about-contact-list .contact-value {
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist);
  word-break: break-word;
}

.page-about .about-contact-list .contact-value.mono {
  font-family: var(--font-mono);
  letter-spacing: -0.01em;
}

.page-about .contact-note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-hair);
  font-size: 12px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 中等屏 ---------- */
@media (min-width: 720px) {
  .page-about .about-position-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-intro {
    padding-top: 20px;
  }

  .page-about .about-content-levels {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-network-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-contract-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-intro {
    padding: 26px 0 68px;
  }

  .page-about .about-intro-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(260px, 0.7fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .about-intro-figure {
    aspect-ratio: 4 / 5;
  }

  .page-about .about-position {
    padding: 68px 0;
  }

  .page-about .about-position-grid {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-position-num {
    padding-top: 6px;
  }

  .page-about .about-team,
  .page-about .about-content,
  .page-about .about-network,
  .page-about .about-rhythm {
    padding: 68px 0;
  }

  .page-about .about-team-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: 18px;
    padding-bottom: 56px;
  }

  .page-about .about-team-card:nth-child(2) {
    transform: translateY(28px);
  }

  .page-about .about-team-card:nth-child(3) {
    transform: translateY(56px);
  }

  .page-about .about-content-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 32px;
    align-items: start;
  }

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

  .page-about .about-content-figure {
    position: sticky;
    top: 24px;
  }

  .page-about .about-network-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 36px;
  }

  .page-about .about-network-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-rhythm-item {
    padding-left: 34px;
  }

  .page-about .about-contact {
    padding: 68px 0 84px;
  }

  .page-about .about-contact-panel {
    padding: 42px 44px;
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    grid-template-areas:
      "eyebrow list"
      "title list"
      "lead list"
      "actions list"
      "note note";
    gap: 0 40px;
    align-items: start;
  }

  .page-about .about-contact-panel > .eyebrow {
    grid-area: eyebrow;
  }

  .page-about .about-contact-panel > h2 {
    grid-area: title;
  }

  .page-about .about-contact-lead {
    grid-area: lead;
  }

  .page-about .about-contact-actions {
    grid-area: actions;
    margin-bottom: 0;
  }

  .page-about .about-contact-list {
    grid-area: list;
    align-self: start;
    margin-top: 6px;
  }

  .page-about .contact-note {
    grid-area: note;
    margin-top: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-card:nth-child(2),
  .page-about .about-team-card:nth-child(3) {
    transform: none;
  }

  .page-about .about-content-figure {
    position: static;
  }
}
<<<END>>>