.page-about {
  --about-line: rgba(136, 146, 176, 0.28);
  display: block;
  position: relative;
  padding-top: calc(var(--topbar-h) + 20px);
  padding-bottom: clamp(60px, 9vw, 130px);
  color: var(--chalk);
  background:
    radial-gradient(1100px 560px at 82% -4%, rgba(201, 162, 75, 0.11), transparent 62%),
    radial-gradient(900px 520px at 4% 92%, rgba(0, 229, 199, 0.07), transparent 66%),
    var(--gobi);
  overflow-x: clip;
}

.page-about .shell {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding-left: clamp(18px, 4vw, 46px);
  padding-right: clamp(18px, 4vw, 46px);
  box-sizing: border-box;
}

/* ---------- 面包屑 ---------- */

.page-about .breadcrumb {
  margin-bottom: clamp(20px, 4vw, 40px);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--sand-lt);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 200, 121, 0.35);
}

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

.page-about .breadcrumb li + li::before {
  content: "›";
  margin-right: 8px;
  color: var(--mist);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(16px, 3vw, 40px) 0 clamp(38px, 6vw, 74px);
  border-bottom: 2px solid rgba(201, 162, 75, 0.32);
}

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--sand);
}

.page-about .about-hero h1 {
  margin: 0 0 26px;
  padding-left: clamp(14px, 2vw, 26px);
  border-left: 6px solid var(--sand);
  font-size: clamp(29px, 6vw, 62px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.02em;
  max-width: 16em;
}

.page-about .about-hero .lede {
  max-width: 44em;
  margin: 0 0 clamp(30px, 5vw, 48px);
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.85;
  color: var(--chalk);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: 16px 14px 18px;
  border-top: 5px solid var(--sand);
  background: var(--panel);
}

.page-about .about-fact:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .about-fact:nth-child(3) {
  border-top-color: var(--grass);
}

.page-about .about-fact:nth-child(4) {
  border-top-color: var(--sand-lt);
}

.page-about .about-fact__v {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__l {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 章节通用 ---------- */

.page-about .about-chapter {
  padding-top: clamp(58px, 9vw, 128px);
}

.page-about .about-band {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  margin-bottom: clamp(26px, 4vw, 48px);
  padding: 14px 0 14px 18px;
  border-left: 5px solid var(--sand);
  background: linear-gradient(90deg, rgba(20, 27, 51, 0.92), rgba(20, 27, 51, 0));
}

.page-about .about-chapter p {
  margin: 0 0 18px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--chalk);
}

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

.page-about .about-note {
  display: block;
  margin-top: 22px;
  padding-left: 16px;
  border-left: 2px solid rgba(201, 162, 75, 0.5);
  line-height: 1.9;
}

.page-about .about-plain {
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* ---------- 两栏布局 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}

.page-about .about-split__main,
.page-about .about-split__aside {
  min-width: 0;
}

/* ---------- 痛点列表 ---------- */

.page-about .pain-list {
  margin: 26px 0 26px;
  padding: 0;
  list-style: none;
}

.page-about .pain-item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  padding: 15px 0;
  border-top: 1px solid var(--about-line);
}

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

.page-about .pain-item__n {
  padding-top: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--sand);
}

.page-about .pain-item p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
}

/* ---------- 侧栏面板 ---------- */

.page-about .side-panel {
  padding: 24px 22px 26px;
  background: var(--panel);
  border-left: 4px solid var(--cyan);
  box-shadow: var(--hard-shadow);
}

.page-about .side-panel--quiet {
  border-left-color: var(--sand);
}

.page-about .side-panel__title {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--sand-lt);
}

.page-about .side-panel__note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--about-line);
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .side-panel p:not(.side-panel__title):not(.side-panel__note) {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--chalk);
}

.page-about .side-stats {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .side-stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .side-stat:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .side-stat dt {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .side-stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 22px;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ---------- 图片框 ---------- */

.page-about .about-figure {
  position: relative;
  margin: 0 0 clamp(26px, 4vw, 44px);
  overflow: hidden;
  border: 2px solid rgba(201, 162, 75, 0.4);
  background: var(--panel);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.05);
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, rgba(20, 27, 51, 0.55), rgba(11, 16, 32, 0.22));
  pointer-events: none;
}

.page-about .about-figure figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  padding: 10px 16px;
  border-top: 2px solid var(--sand);
  background: rgba(11, 16, 32, 0.84);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sand-lt);
}

.page-about .about-split__aside .about-figure {
  margin-bottom: 0;
}

/* ---------- 流程工序 ---------- */

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

.page-about .flow__step {
  min-width: 0;
  background: var(--panel);
  border-top: 5px solid var(--sand);
}

.page-about .flow__step > summary {
  display: block;
  padding: 20px 20px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .flow__step > summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .flow__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--sand);
}

.page-about .flow__name {
  display: block;
  margin-bottom: 8px;
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .flow__meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .flow__body {
  margin: 0 20px 20px;
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
}

.page-about .flow__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 团队比例条 ---------- */

.page-about .team-bar {
  display: block;
  width: 100%;
  height: 64px;
  margin: 28px 0 0;
  border: 2px solid rgba(232, 234, 242, 0.16);
}

.page-about .team-legend {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .team-legend__item {
  position: relative;
  min-width: 0;
  padding: 16px 0 0 24px;
  border-top: 2px solid var(--about-line);
  transition: border-color 0.22s ease;
}

.page-about .team-legend__item:hover {
  border-top-color: var(--sand);
}

.page-about .team-legend__dot {
  position: absolute;
  left: 0;
  top: 21px;
  width: 12px;
  height: 12px;
}

.page-about .team-legend__dot--a {
  background: var(--sand);
}

.page-about .team-legend__dot--b {
  background: var(--cyan);
}

.page-about .team-legend__dot--c {
  background: var(--mist);
}

.page-about .team-legend__num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 26px;
  line-height: 1;
  color: var(--chalk);
  font-variant-numeric: tabular-nums;
}

.page-about .team-legend__name {
  margin-left: 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--sand-lt);
}

.page-about .team-legend__desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 4px 38px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--sand), rgba(201, 162, 75, 0.12));
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -38px;
  top: 4px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  background: var(--gobi);
  border: 2px solid var(--sand);
  border-radius: 0;
}

.page-about .timeline__item:last-child::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--chalk);
  letter-spacing: -0.01em;
}

.page-about .timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 协作列表 ---------- */

.page-about .collab-list {
  margin: 26px 0 26px;
  padding: 0;
  list-style: none;
}

.page-about .collab-list__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 18px;
  align-items: baseline;
  padding: 16px 0;
  border-top: 1px solid var(--about-line);
}

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

.page-about .collab-list__num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .collab-list__txt {
  font-size: 16px;
  line-height: 1.76;
  color: var(--chalk);
}

/* ---------- 工作准则 ---------- */

.page-about .creed-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .creed {
  position: relative;
  padding: 22px 0 22px 24px;
  border-left: 3px solid var(--sand);
  border-bottom: 1px solid var(--about-line);
}

.page-about .creed:first-child {
  padding-top: 6px;
}

.page-about .creed__title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 800;
  line-height: 1.45;
  color: var(--chalk);
  font-style: italic;
  letter-spacing: -0.005em;
}

.page-about .creed__text {
  margin: 0;
  max-width: 62em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--chalk);
}

/* ---------- 结尾入口 ---------- */

.page-about .about-cta {
  padding-top: clamp(58px, 9vw, 128px);
}

.page-about .cta-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .cta-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
  padding: 22px 20px 24px;
  background: var(--panel);
  border-top: 4px solid var(--sand);
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .cta-card:hover {
  transform: translateY(-3px);
  border-top-color: var(--cyan);
  background: var(--step);
}

.page-about .cta-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .cta-card__label {
  font-size: 18px;
  font-weight: 800;
  color: var(--sand-lt);
  letter-spacing: 0.01em;
}

.page-about .cta-card__text {
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 响应式 ---------- */

@media (max-width: 420px) {
  .page-about .about-facts {
    grid-template-columns: minmax(0, 1fr);
  }

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

@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .team-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

@media (min-width: 900px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }

  .page-about .creed-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 44px;
  }

  .page-about .creed:nth-child(odd) {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .creed:nth-child(1),
  .page-about .creed:nth-child(2) {
    padding-top: 6px;
  }

  .page-about .cta-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .shell {
    max-width: 1320px;
    margin-left: 0;
    margin-right: auto;
    padding-left: calc(var(--rail-w) + 44px);
    padding-right: clamp(32px, 5vw, 80px);
  }

  .page-about .about-split--timeline .about-split__aside {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .cta-card {
    transition: none;
  }

  .page-about .cta-card:hover {
    transform: none;
  }
}
<<<END>>>