.page-about {
  --about-radius: var(--r-lg);
}

.page-about .breadcrumbs__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .breadcrumbs__item {
  display: inline-flex;
  align-items: center;
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumbs__link {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .breadcrumbs__link:hover,
.page-about .breadcrumbs__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink);
  padding: calc(var(--header-h) + clamp(28px, 6vw, 68px)) 0 clamp(40px, 6vw, 76px);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .36;
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 85% at 12% 8%, rgba(11, 42, 35, .18), rgba(7, 24, 35, .94) 72%),
    linear-gradient(180deg, rgba(7, 24, 35, .5), var(--ink) 94%);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(12px, 2vw, 18px);
}

.page-about .about-hero__title {
  margin: clamp(14px, 3vw, 26px) 0 0;
  font-size: clamp(40px, 8.6vw, 108px);
  font-weight: 250;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--text);
  max-width: 16ch;
}

.page-about .about-hero__title span {
  display: inline-block;
  color: var(--cyan);
  font-weight: 200;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(22px, 4vw, 38px) 0 0;
  padding: clamp(18px, 3vw, 26px) 0 0;
  border-top: 1px solid var(--line-soft);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 12px;
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-stat__num {
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-about .about-stat__unit {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- 通用章节头 ---------- */

.page-about .about-head {
  display: grid;
  gap: 12px;
  max-width: 860px;
}

.page-about .about-head .h2 {
  margin: 0;
}

.page-about .about-head .lede {
  margin: 0;
  color: var(--muted);
}

/* ---------- 起点与时间轴 ---------- */

.page-about .about-timeline {
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-timeline__rail {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-stage {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: 16px 16px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: rgba(18, 59, 51, .5);
  color: var(--muted);
  text-align: left;
  cursor: pointer;
  transition: transform .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease), color .25s var(--ease);
}

.page-about .about-stage:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .about-stage:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .about-stage[aria-selected="true"] {
  background: rgba(77, 243, 212, .1);
  border-color: var(--cyan);
  color: var(--text);
}

.page-about .about-stage__num {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-stage__name {
  font-size: 16px;
  font-weight: 650;
  letter-spacing: -.01em;
}

.page-about .about-stage__hint {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-panel {
  margin-top: 16px;
  padding: clamp(22px, 3.4vw, 40px);
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: linear-gradient(160deg, var(--panel), rgba(18, 59, 51, .5));
}

.page-about .about-panel[hidden] {
  display: none;
}

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

.page-about .about-panel .h3 {
  margin: 0 0 12px;
  font-size: clamp(20px, 2.6vw, 28px);
}

.page-about .about-panel p {
  margin: 0 0 16px;
  max-width: 68ch;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .about-panel__points li {
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 三条内容线 ---------- */

.page-about .about-lines__lede {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 66ch;
  color: var(--muted);
}

.page-about .about-lines__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-line {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: var(--panel);
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}

.page-about .about-line:hover {
  transform: translateY(-3px);
  border-color: rgba(77, 243, 212, .45);
}

.page-about .about-line .card__bar {
  display: block;
  width: 100%;
  height: 4px;
}

.page-about .about-line .card__bar--orange {
  background: var(--orange);
}

.page-about .about-line .card__bar--signal {
  background: var(--signal);
}

.page-about .about-line--c {
  background: linear-gradient(155deg, rgba(77, 243, 212, .12), var(--panel) 58%);
  border-color: rgba(77, 243, 212, .4);
}

.page-about .about-line .card__body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.6vw, 30px);
}

.page-about .about-line .card__meta {
  margin: 0;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .about-line .card__title {
  margin: 0;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--text);
}

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

.page-about .about-line__list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-line__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-line__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-lines__figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--about-radius);
  border: 1px solid var(--line-soft);
  background: var(--panel-blue);
  min-height: 220px;
}

.page-about .about-lines__figure .media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-lines__figure .media__code,
.page-about .about-rhythm__media .media__code {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  background: rgba(7, 24, 35, .74);
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: .1em;
}

.page-about .about-lines__figure .media__caption,
.page-about .about-rhythm__media .media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 26px 14px 12px;
  background: linear-gradient(180deg, rgba(7, 24, 35, 0), rgba(7, 24, 35, .88));
  font-size: 12px;
  line-height: 1.6;
  color: var(--text);
}

/* ---------- 团队 ---------- */

.page-about .about-team__lede {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
}

.page-about .about-team__tabs {
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .about-team__rail {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-role {
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-role:hover {
  border-color: var(--cyan);
  color: var(--text);
}

.page-about .about-role:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .about-role[aria-selected="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  font-weight: 650;
}

.page-about .about-role__panel {
  display: grid;
  gap: 10px;
  max-width: 74ch;
  margin-top: 20px;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--cyan);
  border-radius: var(--r-md);
  background: rgba(16, 45, 68, .62);
}

.page-about .about-role__panel[hidden] {
  display: none;
}

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

.page-about .about-role__meta {
  margin: 0;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-role__panel .h3 {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 25px);
}

.page-about .about-role__panel p {
  margin: 0;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 节奏 ---------- */

.page-about .about-rhythm__inner {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-rhythm__text .lede {
  margin: 0;
  max-width: 56ch;
  color: var(--muted);
}

.page-about .about-rhythm__list {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
}

.page-about .about-rhythm__item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-rhythm__tag {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .about-rhythm__item p {
  margin: 0;
  max-width: 58ch;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-rhythm__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--about-radius);
  border: 1px solid var(--line-soft);
  background: var(--panel-blue);
  align-self: start;
}

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

/* ---------- 服务范围与沟通 ---------- */

.page-about .about-reach__inner {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .about-reach__card {
  padding: clamp(22px, 3.4vw, 40px);
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: linear-gradient(150deg, rgba(255, 138, 61, .17), rgba(11, 42, 35, .92) 58%);
}

.page-about .about-reach__card .h2 {
  margin: 8px 0 14px;
}

.page-about .about-reach__card p {
  margin: 0 0 14px;
  max-width: 60ch;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-reach__note {
  font-size: 14px;
  color: var(--text);
}

.page-about .about-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.page-about .about-reach__contact {
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: var(--panel);
}

.page-about .about-reach__contact .h3 {
  margin: 0 0 4px;
  font-size: clamp(18px, 2.2vw, 22px);
}

.page-about .about-reach__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-reach__list li {
  display: grid;
  gap: 3px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-reach__list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-reach__label {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .about-reach__value {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  overflow-wrap: anywhere;
}

.page-about .about-reach__contact .about-reach__note {
  margin: 16px 0 0;
  color: var(--muted);
}

.page-about .about-reach__link {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(77, 243, 212, .5);
  transition: border-color .2s var(--ease);
}

.page-about .about-reach__link:hover,
.page-about .about-reach__link:focus-visible {
  border-color: var(--cyan);
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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

@media (min-width: 900px) {
  .page-about .about-lines__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    align-items: stretch;
  }

  .page-about .about-line--a {
    grid-column: span 3;
  }

  .page-about .about-line--b {
    grid-column: span 3;
  }

  .page-about .about-line--c {
    grid-column: span 3;
  }

  .page-about .about-lines__figure {
    grid-column: span 3;
  }

  .page-about .about-reach__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-about .about-rhythm__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }

  .page-about .about-rhythm__media {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-role,
  .page-about .about-line,
  .page-about .breadcrumbs__link {
    transition: none;
  }

  .page-about .about-stage:hover,
  .page-about .about-line:hover {
    transform: none;
  }
}
<<<END>>>