.page-about {
  --about-shadow: 6px 6px 0 0 var(--paper-2);
  color: var(--ink);
  background: var(--paper);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .crumb-list li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--lake-pale);
}

.page-about .crumb-list a {
  color: var(--lake-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .crumb-list a:hover {
  color: var(--flag);
  border-bottom-color: var(--flag);
}

.page-about .crumb-list [aria-current="page"] {
  color: var(--muted);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: 36px 0 64px;
  background:
    radial-gradient(110% 84% at 92% 2%, rgba(138, 111, 209, .26), transparent 62%),
    radial-gradient(88% 74% at 2% 98%, rgba(30, 127, 168, .22), transparent 70%),
    var(--paper);
  border-bottom: 2px solid var(--line-strong);
}

.page-about .hero-contour {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(18, 81, 107, .11) 0 1px,
    transparent 1px 20px
  );
  -webkit-mask-image: radial-gradient(84% 112% at 86% 0%, #000 0%, transparent 74%);
  mask-image: radial-gradient(84% 112% at 86% 0%, #000 0%, transparent 74%);
}

.page-about .hero-kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--sand-ink);
}

.page-about .hero-title {
  margin: 16px 0 0;
  max-width: 15em;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(34px, 8.6vw, 78px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .hero-lede {
  margin: 22px 0 0;
  font-size: 17px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}

.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--paper);
  min-width: 0;
}

.page-about .stat-num {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 30px;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--lake-deep);
}

.page-about .stat-label {
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--muted);
}

/* ---------- 章节导览 ---------- */
.page-about .chapter-rail {
  background: var(--ink-deep);
  padding: 20px 0 14px;
}

.page-about .rail-list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .rail-list li {
  scroll-snap-align: start;
  flex: none;
}

.page-about .rail-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  white-space: nowrap;
  border: 1px solid rgba(245, 242, 234, .26);
  border-radius: 999px;
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  border-color: var(--sand);
  background: rgba(201, 162, 39, .18);
}

.page-about .rail-num {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--sand);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 68px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--dusk {
  background:
    linear-gradient(180deg, rgba(75, 58, 115, .10), rgba(75, 58, 115, 0) 62%),
    var(--paper);
}

.page-about .about-section--night {
  background:
    linear-gradient(180deg, rgba(20, 27, 46, .06), rgba(20, 27, 46, 0) 55%),
    var(--paper);
}

.page-about .about-head {
  position: relative;
  padding-left: 20px;
  margin-bottom: 32px;
}

.page-about .about-head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 6px;
  width: 4px;
  background: linear-gradient(180deg, var(--sand) 0%, var(--sand) 62%, transparent 100%);
}

.page-about .about-num {
  display: block;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--sand-ink);
}

.page-about .about-title {
  margin: 8px 0 0;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(24px, 4.8vw, 42px);
  line-height: 1.18;
  letter-spacing: -.015em;
}

.page-about .about-split {
  display: grid;
  gap: 28px;
}

.page-about .about-aside {
  padding-top: 14px;
  border-top: 2px solid var(--line-strong);
}

.page-about .aside-note {
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--sand-ink);
}

.page-about .aside-text {
  margin: 10px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-body p {
  margin: 0 0 18px;
  font-size: 17px;
  line-height: 1.9;
}

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

.page-about .about-body a {
  color: var(--lake-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--lake-pale);
}

.page-about .about-body a:hover {
  color: var(--flag);
  border-bottom-color: var(--flag);
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 0 0 34px;
  background: var(--paper);
  border: 2px solid var(--line-strong);
  border-top: 4px solid var(--dusk);
  box-shadow: var(--about-shadow);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: linear-gradient(140deg, rgba(18, 81, 107, .18), rgba(138, 111, 209, .18));
}

.page-about .about-figure--wide img {
  aspect-ratio: 14 / 9;
}

.page-about .about-figure--mid img {
  aspect-ratio: 12 / 7;
}

.page-about .about-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  background: var(--paper-2);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- 栏目剖面带 ---------- */
.page-about .layer-band {
  display: grid;
  gap: 6px;
  margin: 0 0 32px;
  padding: 0;
  list-style: none;
}

.page-about .layer-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 13px 16px;
  background: rgba(255, 255, 255, .62);
  border: 1px solid var(--line);
  border-left: 4px solid var(--lake);
  transition: transform .2s var(--ease), background-color .2s var(--ease);
}

.page-about .layer-item:nth-child(1) { border-left-color: var(--lake-deep); }
.page-about .layer-item:nth-child(2) { border-left-color: var(--lake); }
.page-about .layer-item:nth-child(3) { border-left-color: #2F93B8; }
.page-about .layer-item:nth-child(4) { border-left-color: #46A3C4; }
.page-about .layer-item:nth-child(5) { border-left-color: #5FB2CF; }
.page-about .layer-item:nth-child(6) { border-left-color: #78C1D9; }
.page-about .layer-item:nth-child(7) { border-left-color: #92CFE3; }
.page-about .layer-item:nth-child(8) { border-left-color: var(--lake-pale); }

.page-about .layer-item:hover {
  transform: translateX(4px);
  background: rgba(168, 211, 226, .24);
}

.page-about .layer-no {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .layer-name {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 17px;
  min-width: 0;
}

.page-about .layer-count {
  font-size: 12px;
  letter-spacing: .04em;
  text-align: right;
  color: var(--sand-ink);
}

/* ---------- 变更说明清单 ---------- */
.page-about .plain-list {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .plain-list li {
  position: relative;
  padding-left: 22px;
  font-size: 16px;
  line-height: 1.8;
}

.page-about .plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 10px;
  height: 2px;
  background: var(--flag);
}

/* ---------- 团队分工 ---------- */
.page-about .team-bars {
  display: grid;
  gap: 16px;
  margin: 0 0 34px;
  padding: 0;
  list-style: none;
}

.page-about .team-bars li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "label num"
    "track track";
  align-items: center;
  gap: 8px 12px;
}

.page-about .bar-label {
  grid-area: label;
  font-size: 15px;
  font-weight: 500;
}

.page-about .bar-num {
  grid-area: num;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--sand-ink);
}

.page-about .bar-track {
  grid-area: track;
  display: block;
  height: 10px;
  background: var(--paper-2);
  border: 1px solid var(--line);
}

.page-about .bar-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--lake) 0%, var(--dusk-bright) 100%);
}

.page-about .team-bars li:nth-child(1) .bar-fill { width: 32%; }
.page-about .team-bars li:nth-child(2) .bar-fill { width: 21%; }
.page-about .team-bars li:nth-child(3) .bar-fill { width: 27%; }
.page-about .team-bars li:nth-child(4) .bar-fill { width: 21%; }

/* ---------- 折叠说明 ---------- */
.page-about .qa-list {
  display: grid;
  gap: 10px;
}

.page-about .qa {
  background: rgba(255, 255, 255, .58);
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--lake);
}

.page-about .qa > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 18px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
}

.page-about .qa > summary::-webkit-details-marker {
  display: none;
}

.page-about .qa > summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--flag);
}

.page-about .qa[open] > summary::after {
  content: "\2013";
}

.page-about .qa[open] > summary {
  background: rgba(168, 211, 226, .26);
}

.page-about .qa-body {
  padding: 0 18px 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .qa-body p {
  margin: 0 0 12px;
}

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

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  display: flex;
  gap: 16px;
  margin: 0 0 30px;
  padding: 8px 0 20px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .tl-item {
  flex: 0 0 80%;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px 24px;
  scroll-snap-align: start;
  background: var(--paper);
  border: 2px solid var(--line-strong);
  border-top: 4px solid var(--dusk);
  box-shadow: var(--about-shadow);
  transition: transform .2s var(--ease), border-top-color .2s var(--ease);
}

.page-about .tl-item:hover {
  transform: translateY(-4px);
  border-top-color: var(--sand);
}

.page-about .tl-node {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--sand-ink);
}

.page-about .tl-ver {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 26px;
  line-height: 1;
  color: var(--dusk);
}

.page-about .tl-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

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

/* ---------- 服务覆盖 ---------- */
.page-about .cover-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 34px;
  padding: 0;
  list-style: none;
}

.page-about .cover-grid li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 20px 16px;
  background: var(--ink-deep);
  border-top: 3px solid var(--sand);
  color: var(--paper);
}

.page-about .cover-grid li:nth-child(2) { border-top-color: var(--flag); }
.page-about .cover-grid li:nth-child(3) { border-top-color: var(--lake-pale); }
.page-about .cover-grid li:nth-child(4) { border-top-color: var(--dusk-bright); }

.page-about .cover-num {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 26px;
  line-height: 1;
  color: var(--lake-pale);
}

.page-about .cover-label {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(245, 242, 234, .74);
}

/* ---------- 联系方式卡 ---------- */
.page-about .contact-card {
  margin-top: 34px;
  padding: 26px 22px 24px;
  background: var(--paper);
  border: 2px solid var(--line-strong);
  border-left: 4px solid var(--flag);
  box-shadow: var(--about-shadow);
}

.page-about .contact-title {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--sand-ink);
}

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

.page-about .contact-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  min-width: 0;
}

.page-about .contact-key {
  flex: none;
  width: 5.6em;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .contact-val {
  flex: 1 1 12em;
  min-width: 0;
  font-size: 16px;
  font-weight: 500;
  word-break: break-word;
}

.page-about .contact-note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 结尾导引 ---------- */
.page-about .about-closing {
  padding: 68px 0 96px;
  background: linear-gradient(180deg, var(--paper) 0%, rgba(227, 222, 210, .60) 100%);
}

.page-about .closing-title {
  margin: 0 0 26px;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 36px);
  letter-spacing: -.015em;
}

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

.page-about .closing-links a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 20px;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--lake);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
  text-decoration: none;
  transition: transform .2s var(--ease), border-left-color .2s var(--ease);
}

.page-about .closing-links a:hover {
  transform: translateY(-4px);
  border-left-color: var(--flag);
}

.page-about .closing-links .mono {
  flex: none;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--sand-ink);
}

/* ---------- 入场动效 ---------- */
.page-about [data-reveal] {
  opacity: 1;
  transform: none;
}

.page-about [data-reveal][data-revealed] {
  animation: about-rise .42s var(--ease) both;
}

@keyframes about-rise {
  from {
    opacity: .001;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal][data-revealed] {
    animation: none;
  }

  .page-about .layer-item,
  .page-about .tl-item,
  .page-about .closing-links a {
    transition: none;
  }

  .page-about .layer-item:hover,
  .page-about .tl-item:hover,
  .page-about .closing-links a:hover {
    transform: none;
  }
}

/* ---------- 窄屏调整 ---------- */
@media (max-width: 559px) {
  .page-about .layer-item {
    grid-template-columns: 30px minmax(0, 1fr);
    grid-template-areas:
      "no name"
      "no count";
    row-gap: 4px;
  }

  .page-about .layer-no { grid-area: no; }
  .page-about .layer-name { grid-area: name; }
  .page-about .layer-count {
    grid-area: count;
    text-align: left;
  }

  .page-about .layer-item:hover {
    transform: none;
  }

  .page-about .contact-key {
    width: 100%;
  }

  .page-about .tl-item {
    flex: 0 0 86%;
  }
}

/* ---------- 宽屏栅格 ---------- */
@media (min-width: 640px) {
  .page-about .team-bars li {
    grid-template-columns: 128px minmax(0, 1fr) 68px;
    grid-template-areas: "label track num";
    align-items: center;
    gap: 12px;
  }

  .page-about .bar-num {
    text-align: right;
  }

  .page-about .contact-key {
    width: 6.2em;
  }
}

@media (min-width: 760px) {
  .page-about .tl-item {
    flex: 0 0 300px;
  }
}

@media (min-width: 780px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .cover-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-section {
    padding: 104px 0;
  }

  .page-about .about-closing {
    padding: 96px 0 120px;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: 48px;
    align-items: start;
  }

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

  .page-about .about-figure {
    margin-bottom: 44px;
  }
}
<<<END>>>