.page-about {
  --about-rule: rgba(17, 22, 20, 0.14);
  --about-grid: rgba(30, 91, 83, 0.12);
  background: var(--frost);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: clip;
}

.page-about .about-top {
  padding: clamp(16px, 3vw, 28px) 0 0;
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 3px;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-cover {
  position: relative;
  padding: clamp(22px, 4vw, 44px) 0 clamp(32px, 6vw, 68px);
  border-bottom: 1px solid var(--about-rule);
  background-image:
    linear-gradient(to bottom, rgba(243, 247, 244, 0.6), rgba(243, 247, 244, 0.94) 62%, var(--frost) 100%),
    linear-gradient(to right, var(--about-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-grid) 1px, transparent 1px);
  background-size: auto, 84px 84px, 84px 84px;
  background-position: center, center top, center top;
}

.page-about .cover-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: end;
}

.page-about .cover-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 7vw, 66px);
  line-height: 1.14;
  letter-spacing: 0.015em;
  margin: 0.32em 0 0.42em;
  text-wrap: balance;
}

.page-about .cover-lead {
  margin: 0;
  max-width: 46em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
}

.page-about .cover-facts {
  list-style: none;
  display: grid;
  gap: 14px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: clamp(16px, 2.4vw, 22px) 0 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .fact-k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .fact-v {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ink);
}

.page-about .cover-fig {
  padding: 0;
  margin: 0;
  border: 1px solid var(--ink);
  background: var(--ice);
  position: relative;
}

.page-about .cover-fig::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(17, 22, 20, 0.26);
  pointer-events: none;
}

.page-about .cover-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  padding: clamp(30px, 5vw, 64px) 0 clamp(48px, 8vw, 92px);
}

.page-about .index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .index-list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .index-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 7px 12px;
  border: 1px solid var(--about-rule);
  background: var(--paper);
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .index-list a:hover {
  border-color: var(--pine);
  background: var(--ice);
  color: var(--pine);
}

.page-about .idx-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-sections {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-top: clamp(24px, 3.6vw, 40px);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-sections > .about-sec:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-sec + .about-sec {
  margin-top: clamp(36px, 5.6vw, 68px);
}

.page-about .sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px 14px;
  align-items: baseline;
  margin-bottom: clamp(14px, 2vw, 20px);
}

.page-about .sec-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
  border: 1px solid rgba(138, 100, 40, 0.42);
  padding: 2px 7px;
  line-height: 1.6;
}

.page-about .sec-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(22px, 3.2vw, 33px);
  line-height: 1.3;
  letter-spacing: 0.01em;
  text-wrap: balance;
}

.page-about .sec-lead {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  max-width: 44em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 团队矩阵 ---------- */
.page-about .team-matrix {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "code name"
    "desc desc";
  gap: 6px 12px;
  padding: 16px 0 16px 12px;
  border-bottom: 1px solid var(--about-rule);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .team-row:hover {
  background: linear-gradient(90deg, rgba(143, 183, 172, 0.22), transparent 72%);
  box-shadow: inset 3px 0 0 var(--pine);
}

.page-about .team-code {
  grid-area: code;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
  letter-spacing: 0.1em;
}

.page-about .team-name {
  grid-area: name;
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  line-height: 1.5;
}

.page-about .team-count {
  grid-column: 2;
  grid-row: 3;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--pine);
}

.page-about .team-desc {
  grid-area: desc;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.page-about .team-row:hover .team-desc {
  color: var(--ink);
}

/* ---------- 流程 ---------- */
.page-about .flow-layout {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 22px);
}

.page-about .flow-step {
  border-left: 2px solid var(--jade-light);
  padding: 2px 0 2px 16px;
}

.page-about .flow-step:last-child {
  border-left-color: var(--cinnabar);
}

.page-about .flow-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .flow-title {
  margin: 4px 0 6px;
  font-family: var(--font-head);
  font-size: 17px;
  line-height: 1.5;
}

.page-about .flow-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .flow-fig {
  padding: 0;
  margin: 0;
  align-self: start;
  border: 1px solid var(--ink);
  background: var(--ice);
}

.page-about .flow-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 15px;
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 16px;
  bottom: 12px;
  width: 1px;
  background: var(--about-rule);
}

.page-about .tl-item {
  position: relative;
  padding-left: 32px;
  padding-bottom: clamp(20px, 3vw, 30px);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  background: var(--frost);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl-item:hover::before {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
}

.page-about .tl-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  border: 1px solid rgba(138, 100, 40, 0.4);
  padding: 2px 8px;
  margin-bottom: 8px;
}

.page-about .tl-title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 17px;
  line-height: 1.5;
}

.page-about .tl-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .tl-detail {
  margin-top: 10px;
}

.page-about .tl-detail summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--about-rule);
  background: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--pine);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

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

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

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

.page-about .tl-detail summary:hover {
  border-color: var(--pine);
  background: var(--ice);
}

.page-about .tl-detail ul {
  margin: 10px 0 0;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .tl-detail li + li {
  margin-top: 6px;
}

.page-about .rev-fig {
  padding: 0;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  border: 1px solid var(--ink);
  background: var(--ice);
}

.page-about .rev-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .rev-cap {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
  padding: 10px 14px;
  border-top: 1px solid var(--about-rule);
  background: var(--paper);
}

/* ---------- 协作 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 16px;
}

.page-about .partner-card {
  padding: clamp(20px, 3vw, 30px);
}

.page-about .partner-card--pine {
  background: var(--pine);
  color: var(--paper);
}

.page-about .partner-card--ice {
  background: var(--ice);
  color: var(--ink);
  border: 1px solid var(--about-rule);
}

.page-about .partner-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(46px, 8vw, 68px);
  line-height: 1;
  letter-spacing: 0.02em;
}

.page-about .partner-card--pine .partner-num {
  color: var(--paper);
}

.page-about .partner-card--ice .partner-num {
  color: var(--pine);
}

.page-about .partner-name {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  line-height: 1.5;
}

.page-about .partner-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

.page-about .partner-card--pine .partner-text {
  color: rgba(255, 255, 255, 0.86);
}

.page-about .partner-card--ice .partner-text {
  color: var(--mist);
}

.page-about .partners-tail {
  margin-top: clamp(18px, 2.6vw, 26px);
  margin-bottom: 0;
}

.page-about .partners-tail a {
  color: var(--pine);
  text-decoration: none;
  border-bottom: 1px solid rgba(30, 91, 83, 0.45);
}

.page-about .partners-tail a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

/* ---------- 服务与联系 ---------- */
.page-about .service-panel {
  display: grid;
  gap: clamp(24px, 3.4vw, 36px);
  padding: clamp(22px, 3.4vw, 40px);
  background: var(--deep);
  color: var(--paper);
}

.page-about .service-title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.45;
  color: var(--paper);
}

.page-about .service-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .service-text a {
  color: var(--gold-l);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 164, 92, 0.6);
}

.page-about .service-text a:hover {
  color: var(--paper);
}

.page-about .service-text--sub {
  margin-top: 16px;
}

.page-about .service-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .service-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.9);
}

.page-about .service-list li + li {
  margin-top: 8px;
}

.page-about .service-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 10px;
  height: 2px;
  background: var(--cinnabar);
}

.page-about .service-card {
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.06);
  padding: clamp(18px, 2.6vw, 24px);
}

.page-about .service-label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--gold-l);
}

.page-about .service-contact {
  margin: 0;
}

.page-about .service-contact > div {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 10px;
  padding: 9px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about .service-contact > div:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .service-contact dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--jade-light);
}

.page-about .service-contact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  word-break: break-word;
  color: var(--paper);
}

.page-about .service-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.66);
}

.page-about .service-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 20px;
}

.page-about .service-ghost {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.45);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .service-ghost:hover {
  color: var(--gold-l);
  border-bottom-color: var(--gold-l);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .cover-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

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

@media (min-width: 640px) {
  .page-about .flow-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(18px, 2.4vw, 26px);
  }

  .page-about .team-row {
    grid-template-columns: 40px 200px 72px minmax(0, 1fr);
    grid-template-areas: "code name count desc";
    align-items: center;
    gap: 0 18px;
    padding: 18px 8px 18px 12px;
  }

  .page-about .team-count {
    grid-column: auto;
    grid-row: auto;
  }
}

@media (min-width: 900px) {
  .page-about .cover-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(32px, 4.6vw, 64px);
  }

  .page-about .flow-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(36px, 4.6vw, 72px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--cmd-h) + 20px);
    padding-right: 8px;
    border-right: 1px solid var(--about-rule);
  }

  .page-about .index-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .index-list li + li {
    border-top: 1px solid var(--about-rule);
  }

  .page-about .index-list a {
    display: flex;
    width: 100%;
    border: 1px solid transparent;
    border-left: 2px solid transparent;
    background: transparent;
    padding: 10px 8px 10px 10px;
  }

  .page-about .index-list a:hover {
    border-color: transparent;
    border-left-color: var(--cinnabar);
    background: var(--ice);
  }

  .page-about .service-panel {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.85fr);
    gap: clamp(28px, 3.6vw, 44px);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-row,
  .page-about .team-desc,
  .page-about .tl-item::before,
  .page-about .index-list a {
    transition: none;
  }
}
<<<END>>>