.page-about {
  --rail-w: 186px;
  --ink-2: #3B4A57;
  --no-w: 44px;
  background: var(--ink);
  color: var(--mist);
}

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink);
  border-bottom: 1px solid var(--edge);
  padding-block: clamp(22px, 3.6vw, 40px) clamp(34px, 5vw, 64px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -14%;
  width: 68%;
  height: 170%;
  background: linear-gradient(158deg, rgba(255, 138, 61, 0.16), rgba(79, 191, 160, 0.09) 58%, transparent 78%);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 84%);
  transform: rotate(-8deg);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--edge) 1px, transparent 1px),
    linear-gradient(90deg, var(--edge) 1px, transparent 1px);
  background-size: 68px 68px;
  opacity: 0.22;
  -webkit-mask-image: linear-gradient(118deg, #000, transparent 68%);
  mask-image: linear-gradient(118deg, #000, transparent 68%);
  pointer-events: none;
  z-index: -1;
}

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

.page-about .about-hero .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 30px);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fog);
}

.page-about .about-hero .breadcrumb a {
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--celadon);
  border-bottom-color: var(--celadon);
}

.page-about .about-hero .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.6vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-lede {
  margin: clamp(16px, 2.2vw, 24px) 0 0;
  max-width: 42em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .stat {
  background: rgba(19, 41, 61, 0.86);
  padding: 16px clamp(14px, 2vw, 22px);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.01em;
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  color: var(--fog);
}

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  padding-block: clamp(34px, 5vw, 72px);
}

.page-about .about-rail {
  display: none;
}

.page-about .rail-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .rail-list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .rail-list a {
  display: flex;
  gap: 9px;
  padding: 7px 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--fog);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .rail-list a .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--edge);
  transition: color 0.2s var(--ease);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--amber);
}

.page-about .rail-list a:hover .mono,
.page-about .rail-list a:focus-visible .mono {
  color: var(--amber);
}

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

.page-about .chapter-block {
  padding-block: clamp(30px, 4.4vw, 54px);
  border-top: 1px solid var(--edge);
}

.page-about .chapter-block:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .blk-head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  margin-bottom: clamp(16px, 2.4vw, 28px);
}

.page-about .blk-no {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(32px, 4.8vw, 52px);
  line-height: 0.9;
  color: var(--fog);
  opacity: 0.45;
  transition: color 0.24s var(--ease), opacity 0.24s var(--ease);
}

.page-about .chapter-block.is-active .blk-no {
  color: var(--amber);
  opacity: 1;
}

.page-about .blk-head .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--fog);
}

.page-about .blk-title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .blk-lede {
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  max-width: 44em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .inline-link {
  color: var(--celadon);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.2s var(--ease);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--amber);
}

/* 第一节 */
.page-about .crew-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 32px);
}

.page-about .crew-stack {
  min-width: 0;
}

.page-about .crew-card {
  background: var(--ink-deep);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: clamp(16px, 2vw, 22px) clamp(16px, 2.2vw, 24px);
}

.page-about .crew-card + .crew-card {
  margin-top: 12px;
}

.page-about .crew-card:nth-child(2) {
  margin-left: clamp(0px, 2.4vw, 22px);
}

.page-about .crew-card:nth-child(3) {
  margin-left: clamp(0px, 4.8vw, 44px);
}

.page-about .crew-card h3 {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .crew-count {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  color: var(--celadon);
  border: 1px solid rgba(79, 191, 160, 0.42);
  border-radius: 3px;
  padding: 1px 6px;
}

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

.page-about .handoff {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--amber);
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(160deg, var(--ink-deep), var(--ink));
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--edge) 1px, transparent 1px),
    linear-gradient(90deg, var(--edge) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: 0.16;
  pointer-events: none;
}

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

.page-about .about-figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 22px 14px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  color: var(--mist);
  background: linear-gradient(transparent, rgba(10, 26, 42, 0.94));
}

/* 第二节 工序 */
.page-about .proc-figure {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .proc {
  --no-w: 44px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .proc-step {
  position: relative;
  display: grid;
  grid-template-columns: var(--no-w) minmax(0, 1fr);
  gap: clamp(10px, 2vw, 18px);
  padding-bottom: clamp(18px, 2.4vw, 26px);
}

.page-about .proc-step::before {
  content: "";
  position: absolute;
  left: calc(var(--no-w) / 2);
  top: 4px;
  bottom: 0;
  width: 1px;
  background: repeating-linear-gradient(to bottom, var(--edge) 0 6px, transparent 6px 13px);
}

.page-about .proc-step:last-child::before {
  display: none;
}

.page-about .proc-no {
  position: relative;
  z-index: 1;
  align-self: start;
  padding: 2px 0 6px;
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.2vw, 30px);
  line-height: 1.2;
  color: var(--fog);
  transition: color 0.2s var(--ease);
}

.page-about .proc-step:hover .proc-no {
  color: var(--amber);
}

.page-about .proc-body {
  min-width: 0;
  padding-top: 2px;
}

.page-about .proc-body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .proc-body p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

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

.page-about .proc-note {
  padding-left: 10px;
  border-left: 2px solid var(--edge);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--fog);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .proc-step:hover .proc-note,
.page-about .proc-step:focus-within .proc-note {
  color: var(--celadon);
  border-color: var(--celadon);
}

/* 第三节 时间带 */
.page-about .tl-figure {
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .tl-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .tl-item details {
  height: 100%;
  background: var(--ink-deep);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
}

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

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

.page-about .tl-bar {
  display: block;
  height: 3px;
  border-radius: 2px;
  background: var(--edge);
  margin-bottom: 12px;
  transition: background 0.2s var(--ease);
}

.page-about .tl-item--one .tl-bar {
  height: 6px;
  background: var(--amber);
}

.page-about .tl-item--two .tl-bar {
  height: 6px;
  background: var(--fog);
}

.page-about .tl-item--three .tl-bar {
  height: 6px;
  background: var(--celadon);
}

.page-about .tl-item--four .tl-bar {
  height: 6px;
  background: var(--clay);
}

.page-about .tl-item--five .tl-bar {
  height: 6px;
  background: var(--amber-lift);
}

.page-about .tl-meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--fog);
}

.page-about .tl-title {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .tl-title::after {
  content: "＋";
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fog);
  transition: color 0.2s var(--ease);
}

.page-about .tl-item details[open] .tl-title::after {
  content: "－";
  color: var(--amber);
}

.page-about .tl-panel {
  padding: 12px 14px 16px;
  border-top: 1px solid var(--edge);
}

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

/* 第四节 分类 */
.page-about .panel-paper {
  background: var(--paper);
  border: 1px solid var(--hair-line);
  border-radius: var(--radius);
  padding: clamp(20px, 3vw, 36px);
}

.page-about .panel-paper p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-2);
}

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

.page-about .tree-viz {
  margin: 20px 0;
  padding: 16px 0;
  border-top: 1px solid var(--hair-line);
  border-bottom: 1px solid var(--hair-line);
  display: grid;
  gap: 10px;
}

.page-about .tree-row {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr) 62px;
  align-items: center;
  gap: 10px;
}

.page-about .tree-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: #6D7A85;
}

.page-about .tree-bar {
  display: block;
  height: 14px;
  border-radius: 3px;
}

.page-about .tree-bar--a {
  width: 100%;
  background: var(--ink-deep);
}

.page-about .tree-bar--b {
  width: 64%;
  background: var(--celadon-dp);
}

.page-about .tree-bar--c {
  width: 40%;
  background: var(--amber);
}

.page-about .tree-num {
  font-family: var(--font-mono);
  font-size: 13px;
  text-align: right;
  color: var(--ink-text);
}

.page-about .axis-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0 14px;
}

.page-about .axis-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: linear-gradient(180deg, #FFFDF8, var(--rice));
  border: 1px solid var(--hair-line);
  border-radius: 4px;
  font-size: 13px;
  color: var(--ink-text);
  box-shadow: 0 1px 2px rgba(20, 33, 46, 0.1);
}

.page-about .axis-tag .mono {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--celadon-dp);
}

/* 第五节 校对 */
.page-about .review-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .review-card {
  background: var(--ink-deep);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.page-about .review-k {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--fog);
}

.page-about .review-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .review-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .review-card .review-k {
  font-size: 11px;
  color: var(--celadon);
}

/* 第六节 联系 */
.page-about .contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

.page-about .contact-ways {
  display: grid;
  gap: 10px;
}

.page-about .way {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  background: var(--ink-deep);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .way:hover,
.page-about .way:focus-visible {
  border-color: var(--celadon);
  transform: translateY(-2px);
}

.page-about .way-k {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fog);
  padding-top: 2px;
  transition: color 0.2s var(--ease);
}

.page-about .way:hover .way-k,
.page-about .way:focus-visible .way-k {
  color: var(--celadon);
}

.page-about .way-body {
  min-width: 0;
}

.page-about .way-body strong {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .way-body span {
  display: block;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .contact-facts {
  padding: clamp(18px, 2.4vw, 24px);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background: rgba(19, 41, 61, 0.55);
}

.page-about .contact-list {
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .contact-list div {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--edge);
}

.page-about .contact-list div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .contact-list dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--fog);
}

.page-about .contact-list dd {
  margin: 5px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
  word-break: break-word;
}

/* 底部 */
.page-about .about-cta {
  border-top: 1px solid var(--edge);
  background:
    linear-gradient(132deg, rgba(255, 138, 61, 0.12), transparent 56%),
    var(--ink-deep);
  padding-block: clamp(32px, 5vw, 64px);
}

.page-about .about-cta .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-cta .blk-title {
  margin: 10px 0 0;
}

.page-about .cta-copy {
  margin: 12px 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .proc {
    --no-w: 58px;
  }

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

  .page-about .review-card:nth-child(even) {
    margin-top: 22px;
  }

  .page-about .proc-step:nth-child(2) {
    max-width: 96%;
  }

  .page-about .proc-step:nth-child(3) {
    max-width: 92%;
  }

  .page-about .proc-step:nth-child(4) {
    max-width: 88%;
  }

  .page-about .proc-step:nth-child(5) {
    max-width: 84%;
  }

  .page-about .proc-step:nth-child(6) {
    max-width: 80%;
  }
}

@media (min-width: 860px) {
  .page-about .crew-layout {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    align-items: start;
  }

  .page-about .contact-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .about-cta-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(20px, 4vw, 48px);
  }

  .page-about .cta-actions {
    margin-top: 0;
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .tl-track {
    display: flex;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about .tl-item {
    flex: 1 1 0;
    min-width: 0;
  }

  .page-about .tl-item--one {
    flex-grow: 1.4;
  }

  .page-about .tl-item--two {
    flex-grow: 1.15;
  }

  .page-about .tl-item--three {
    flex-grow: 1.3;
  }

  .page-about .tl-item--four {
    flex-grow: 1;
  }

  .page-about .tl-item--five {
    flex-grow: 0.9;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 60px);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    padding-left: 16px;
    border-left: 1px solid var(--edge);
  }
}
<<<END>>>