.page-about {
  background: var(--ink);
  color: var(--paper);
  padding-bottom: 0;
}

/* 面包屑 */
.page-about .crumbs {
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}
.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--mist);
}
.page-about .crumbs a {
  color: var(--cyan);
  text-decoration: none;
}
.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  text-decoration: underline;
}
.page-about .crumbs [aria-current="page"] {
  color: var(--mist);
}

/* 首屏 */
.page-about .about-hero {
  padding: 26px 0 52px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(115% 90% at 92% -10%, rgba(53, 224, 210, 0.18), transparent 58%),
    radial-gradient(90% 80% at 0% 110%, rgba(122, 31, 61, 0.34), transparent 60%);
}
.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}
.page-about .about-hero .eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .about-hero .t-hero {
  margin: 0 0 20px;
  max-width: 15em;
  font-size: clamp(30px, 5vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 900;
}
.page-about .about-hero__lead {
  margin: 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(246, 241, 231, 0.9);
}

/* 展签式署名牌 */
.page-about .platz {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  max-width: 520px;
  margin: 26px 0 28px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .platz__item {
  padding: 14px 16px;
  background: var(--panel);
}
.page-about .platz dt {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}
.page-about .platz dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}
.page-about .platz dd .mono {
  color: var(--cyan);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-hero__actions .btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

/* 图片容器 */
.page-about .media-frame {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--card);
}
.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .media-frame--16x9 {
  aspect-ratio: 16 / 9;
}
.page-about .media-frame__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: var(--panel);
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}
.page-about .about-team__media {
  margin: 22px 0 0;
  aspect-ratio: 3 / 2;
}
.page-about .about-reach__media {
  margin: 0 0 22px;
  aspect-ratio: 12 / 7;
}

/* 主体展墙 */
.page-about .about-wall {
  display: grid;
  gap: 38px;
  padding-top: 44px;
}
.page-about .about-wall__main {
  display: flex;
  flex-direction: column;
  gap: 38px;
}

.page-about .about-chapter {
  padding-bottom: 38px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-chapter:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}
.page-about .about-chapter .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .about-chapter .t-section {
  margin: 0 0 18px;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  font-weight: 900;
}
.page-about .prose p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(246, 241, 231, 0.86);
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* 场景条 */
.page-about .scene-list {
  display: grid;
  gap: 1px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .scene-list li {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: var(--panel);
}
.page-about .scene-list__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}
.page-about .scene-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(246, 241, 231, 0.82);
}

/* 团队三组 */
.page-about .about-intro {
  max-width: 44em;
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(246, 241, 231, 0.84);
}
.page-about .team-grid {
  display: grid;
  gap: 14px;
}
.page-about .team-card {
  --slot: var(--wine);
  padding: 20px 18px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 4px solid var(--slot);
  transition: transform var(--dur) var(--ease);
}
.page-about .team-card:hover {
  transform: translateY(-2px);
}
.page-about .team-card--edit {
  --slot: var(--wine);
}
.page-about .team-card--dev {
  --slot: var(--teal);
}
.page-about .team-card--ops {
  --slot: var(--indigo);
}
.page-about .team-card__badge {
  display: inline-block;
  padding: 4px 9px;
  background: var(--slot);
  color: var(--paper);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
}
.page-about .team-card__title {
  margin: 14px 0 12px;
  font-size: 19px;
  line-height: 1.4;
  font-weight: 800;
  color: var(--paper);
}
.page-about .team-card__list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .team-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(246, 241, 231, 0.82);
}
.page-about .team-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--slot);
}

/* 上线流程 */
.page-about .flow {
  display: grid;
  gap: 12px;
  margin: 0 0 20px;
}
.page-about .flow__item {
  padding: 18px 16px 20px;
  background: var(--card);
  border: 1px solid var(--line);
}
.page-about .flow__num {
  display: block;
  margin-bottom: 12px;
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
}
.page-about .flow__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--paper);
}
.page-about .flow__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(246, 241, 231, 0.8);
}
.page-about .cycle-box {
  padding: 16px 18px;
  background: rgba(255, 122, 47, 0.1);
  border-left: 6px solid var(--orange);
}
.page-about .cycle-box__num {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange);
}
.page-about .cycle-box__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(246, 241, 231, 0.86);
}

/* 覆盖与配置 */
.page-about .scale-table {
  border: 1px solid var(--line);
  background: var(--panel);
}
.page-about .scale-row {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}
.page-about .scale-row:last-child {
  border-bottom: 0;
}
.page-about .scale-row span {
  font-size: 15px;
  line-height: 1.65;
  color: rgba(246, 241, 231, 0.84);
}
.page-about .scale-row span:first-child {
  font-weight: 800;
  color: var(--paper);
}
.page-about .scale-row .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--cyan);
}
.page-about .scale-row--head {
  display: none;
}
.page-about .scale-row--head span {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* 右侧时间轴 */
.page-about .about-rail {
  padding: 22px 20px 8px;
  background: var(--panel);
  border: 1px solid var(--line);
}
.page-about .rail__title {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .tl {
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid var(--line);
}
.page-about .tl__node {
  position: relative;
  padding: 0 0 20px;
}
.page-about .tl__node:last-child {
  padding-bottom: 14px;
}
.page-about .tl__node::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 224, 210, 0.14);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .tl__node:hover::before,
.page-about .tl__node:focus::before,
.page-about .tl__node:focus-within::before {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.2);
}
.page-about .tl__node:focus {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}
.page-about .tl__ver {
  margin: 0 0 4px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}
.page-about .tl__title {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}
.page-about .tl__more {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* 收尾服务区 */
.page-about .about-service {
  margin-top: 56px;
  padding: 44px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(160deg, var(--panel), var(--card) 55%, #0e2e45);
}
.page-about .about-service__inner {
  display: grid;
  gap: 30px;
}
.page-about .about-service .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}
.page-about .about-service .t-section {
  margin: 0 0 16px;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.26;
  font-weight: 900;
}
.page-about .about-service__copy p {
  max-width: 34em;
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(246, 241, 231, 0.88);
}
.page-about .about-service__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-service__actions .btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}
.page-about .about-service__meta {
  display: grid;
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-service__meta > div {
  padding: 14px 16px;
  background: var(--ink);
}
.page-about .about-service__meta dt {
  margin: 0 0 4px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}
.page-about .about-service__meta dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}
.page-about .about-service__meta dd.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  color: var(--cyan);
}

/* 平板及以上 */
@media (min-width: 700px) {
  .page-about .scene-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .scale-row {
    grid-template-columns: 130px 130px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
  .page-about .scale-row--head {
    display: grid;
    background: var(--card);
  }
}

/* 桌面：8/4 展墙 + 吸顶时间轴 */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: center;
  }
  .page-about .about-wall {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: 44px;
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }
  .page-about .about-service__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }
  .page-about .tl__more {
    max-height: 0;
    margin: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease),
      margin var(--dur) var(--ease);
  }
  .page-about .tl__node:hover .tl__more,
  .page-about .tl__node:focus .tl__more {
    max-height: 9em;
    margin-top: 6px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .tl__node::before,
  .page-about .tl__more {
    transition: none;
  }
  .page-about .team-card:hover {
    transform: none;
  }
}
<<<END>>>