.page-about {
  --about-text: rgba(233, 242, 246, 0.8);
  --about-index-w: 186px;
  background: var(--pg-ink);
  color: var(--pg-white);
  overflow-x: hidden;
}

.page-about .pg-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0 0;
  font-family: var(--pg-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--pg-gray);
}

.page-about .pg-crumbs a {
  color: var(--pg-cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s var(--pg-ease);
}

.page-about .pg-crumbs a:hover,
.page-about .pg-crumbs a:focus-visible {
  border-bottom-color: var(--pg-cyan);
}

.page-about .pg-crumbs [aria-current="page"] {
  color: var(--pg-white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4.5vw, 56px) 0 clamp(32px, 5vw, 64px);
  background:
    radial-gradient(58% 78% at 8% 0%, rgba(34, 211, 238, 0.12), transparent 62%),
    radial-gradient(46% 66% at 96% 18%, rgba(168, 85, 247, 0.13), transparent 64%),
    var(--pg-ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(233, 242, 246, 0.035) 0 1px,
    transparent 1px 3px
  );
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(24px, 3.5vw, 40px);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--pg-font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--pg-amber);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(30px, 5.6vw, 60px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  max-width: 18ch;
}

.page-about .about-hero__lead {
  max-width: 60ch;
  margin: 0;
  color: var(--about-text);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 12px;
  margin: 0;
}

.page-about .about-stat {
  padding: 10px 0 10px 14px;
  border-left: 2px solid var(--pg-cyan);
  background: linear-gradient(90deg, rgba(34, 211, 238, 0.1), transparent 72%);
}

.page-about .about-stat dt {
  font-family: var(--pg-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--pg-gray);
}

.page-about .about-stat dd {
  margin: 6px 0 0;
  font-family: var(--pg-font-mono);
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--pg-white);
}

.page-about .about-stat dd small {
  margin-left: 4px;
  font-size: 12px;
  font-weight: 400;
  color: var(--pg-gray);
}

/* ---------- 左索引 + 长卷 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(24px, 3.5vw, 48px);
  padding-top: clamp(24px, 3.5vw, 44px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-index__label {
  margin: 0 0 10px;
  font-family: var(--pg-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--pg-gray);
}

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

.page-about .about-index__list > li {
  flex: 0 0 auto;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 12px;
  font-size: 14px;
  color: var(--pg-gray);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid var(--pg-line);
  transition: color 0.18s var(--pg-ease), border-color 0.18s var(--pg-ease),
    background 0.18s var(--pg-ease);
}

.page-about .about-index__no {
  font-family: var(--pg-font-mono);
  font-size: 11px;
  color: var(--pg-violet);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--pg-white);
  border-bottom-color: var(--pg-cyan);
  background: rgba(34, 211, 238, 0.08);
  outline: none;
}

.page-about .about-index__link:focus-visible {
  outline: 2px solid var(--pg-amber);
  outline-offset: 2px;
}

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

.page-about .about-section {
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-about .about-section + .about-section {
  padding-top: clamp(32px, 5vw, 56px);
  border-top: 1px solid var(--pg-line);
}

.page-about .about-h2 {
  margin: 8px 0 12px;
  font-size: clamp(23px, 3.4vw, 38px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .about-lead {
  max-width: 58ch;
  margin: 0;
  color: var(--about-text);
  font-size: 16px;
  line-height: 1.8;
}

/* ---------- 分工矩阵 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-matrix {
  min-width: 0;
  overflow-x: auto;
}

.page-about .about-matrix__cap {
  padding-bottom: 10px;
  font-family: var(--pg-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-align: left;
  color: var(--pg-gray);
}

.page-about .about-matrix table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
}

.page-about .about-matrix thead th {
  padding: 12px 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-align: left;
  color: var(--pg-gray);
  background: var(--pg-panel);
  border-bottom: 1px solid var(--pg-line);
}

.page-about .about-matrix tbody tr {
  transition: background 0.18s var(--pg-ease);
}

.page-about .about-matrix tbody tr:hover {
  background: rgba(34, 211, 238, 0.07);
}

.page-about .about-matrix tbody th {
  height: 56px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 700;
  text-align: left;
  white-space: nowrap;
  color: var(--pg-white);
  border-bottom: 1px solid var(--pg-line);
  border-left: 2px solid transparent;
  transition: border-color 0.18s var(--pg-ease);
}

.page-about .about-matrix tbody tr:hover th {
  border-left-color: var(--pg-cyan);
}

.page-about .about-matrix tbody td {
  height: 56px;
  padding: 8px 14px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--pg-gray);
  border-bottom: 1px solid var(--pg-line);
  transition: color 0.18s var(--pg-ease);
}

.page-about .about-matrix tbody tr:hover td {
  color: var(--pg-white);
}

.page-about .about-media {
  margin: 0;
  min-width: 0;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--pg-line);
}

.page-about .about-media .pg-media__cap {
  margin-top: 10px;
  font-family: var(--pg-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--pg-gray);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline-wrap {
  position: relative;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.15;
  pointer-events: none;
}

.page-about .about-timeline {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 4px 0 0 28px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(
    to bottom,
    var(--pg-violet),
    var(--pg-cyan) 55%,
    var(--pg-line)
  );
}

.page-about .about-node {
  position: relative;
  padding-bottom: clamp(24px, 3vw, 34px);
}

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

.page-about .about-node__dot {
  position: absolute;
  left: -28px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--pg-violet);
  box-shadow: 0 0 0 4px rgba(168, 85, 247, 0.16);
  transition: background 0.3s var(--pg-ease), box-shadow 0.3s var(--pg-ease);
}

.page-about .about-node:hover .about-node__dot,
.page-about .about-node:focus-within .about-node__dot {
  background: var(--pg-cyan);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.2);
}

.page-about .about-node__year {
  margin: 0 0 6px;
  font-family: var(--pg-font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--pg-cyan);
}

.page-about .about-node__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.2vw, 23px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.35;
}

.page-about .about-node__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}

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

.page-about .about-node__more > summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  font-family: var(--pg-font-mono);
  font-size: 13px;
  color: var(--pg-cyan);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__more > summary::before {
  content: "▸";
  display: inline-block;
  color: var(--pg-violet);
  transition: transform 0.2s var(--pg-ease);
}

.page-about .about-node__more[open] > summary::before {
  transform: rotate(90deg);
}

.page-about .about-node__more > summary:focus-visible {
  outline: 2px solid var(--pg-amber);
  outline-offset: 3px;
}

.page-about .about-node__more .pg-details__body {
  padding: 4px 0 4px 14px;
  border-left: 1px solid var(--pg-line);
}

.page-about .about-node__more .pg-details__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--pg-gray);
}

/* ---------- 流程 ---------- */
.page-about .about-media--flow {
  order: -1;
}

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

.page-about .about-steps {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--pg-line);
}

.page-about .about-step:last-child {
  border-bottom: 1px solid var(--pg-line);
}

.page-about .about-step__no {
  padding-top: 3px;
  font-family: var(--pg-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--pg-violet);
}

.page-about .about-step h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-step p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}

/* ---------- 服务与响应 ---------- */
.page-about .about-service {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(20px, 3vw, 30px);
}

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

.page-about .about-service__text p {
  margin: 0 0 14px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .about-areas {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .about-areas li {
  padding: 6px 12px;
  font-family: var(--pg-font-mono);
  font-size: 13px;
  color: var(--pg-white);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid var(--pg-line);
  clip-path: var(--pg-notch);
}

.page-about .about-service__addr {
  font-family: var(--pg-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--pg-gray);
}

.page-about .about-service__card {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--pg-slate);
  border: 1px solid var(--pg-line);
  clip-path: var(--pg-notch);
}

.page-about .about-card__label {
  margin: 0 0 6px;
  font-family: var(--pg-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--pg-gray);
}

.page-about .about-card__big {
  margin: 0;
  font-family: var(--pg-font-mono);
  font-size: clamp(20px, 2.8vw, 27px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--pg-white);
}

.page-about .about-card__note {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--pg-gray);
}

.page-about .about-service__card .pg-rule {
  margin: 16px 0;
  border: 0;
  border-top: 1px solid var(--pg-line);
}

.page-about .about-copy {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  width: 100%;
  margin: 0 0 14px;
  padding: 9px 12px;
  font-size: 13px;
  text-align: left;
  color: var(--pg-cyan);
  background: transparent;
  border: 1px solid var(--pg-line);
  clip-path: var(--pg-notch);
  cursor: pointer;
  transition: border-color 0.18s var(--pg-ease), background 0.18s var(--pg-ease),
    color 0.18s var(--pg-ease);
}

.page-about .about-copy:hover {
  border-color: var(--pg-cyan);
  background: rgba(34, 211, 238, 0.08);
}

.page-about .about-copy:focus-visible {
  outline: 2px solid var(--pg-amber);
  outline-offset: 2px;
}

.page-about .about-copy[data-copied="true"] {
  color: var(--pg-ok);
  border-color: var(--pg-ok);
}

.page-about .about-copy .pg-mono {
  overflow-wrap: anywhere;
}

/* ---------- 适配测试 ---------- */
.page-about .about-testing {
  margin-top: clamp(20px, 3vw, 30px);
  gap: clamp(16px, 2.4vw, 28px);
}

.page-about .about-test {
  min-width: 0;
  padding: 20px 20px 22px;
  background: var(--pg-slate);
  border-top: 2px solid var(--pg-cyan);
}

.page-about .about-test:nth-child(2) {
  border-top-color: var(--pg-amber);
}

.page-about .about-test:nth-child(3) {
  border-top-color: var(--pg-violet);
}

.page-about .about-test .pg-tag {
  display: inline-block;
  margin: 0;
  font-family: var(--pg-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.page-about .about-test h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

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

/* ---------- 收束 ---------- */
.page-about .about-next {
  margin-top: clamp(20px, 3vw, 32px);
  padding: clamp(26px, 4vw, 44px) clamp(18px, 3vw, 32px);
  background: linear-gradient(180deg, rgba(34, 211, 238, 0.07), transparent 78%);
  border-top: 1px solid var(--pg-line);
}

.page-about .about-next .about-h2 {
  margin-top: 0;
  font-size: clamp(21px, 3vw, 30px);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-log {
  margin: 26px 0 0;
  font-family: var(--pg-font-mono);
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: 0.04em;
  color: var(--pg-gray);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
    align-items: start;
  }

  .page-about .about-media--flow {
    order: 0;
  }

  .page-about .about-service {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) 232px;
    align-items: end;
  }

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

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list > li + li {
    margin-top: 2px;
  }

  .page-about .about-index__link {
    padding: 10px 12px;
    border-bottom: 0;
    border-left: 2px solid var(--pg-line);
    white-space: normal;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--pg-cyan);
    border-bottom-color: transparent;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-copy,
  .page-about .about-matrix tbody tr,
  .page-about .about-node__dot,
  .page-about .about-node__more > summary::before {
    transition: none;
  }
}
<<<END>>>