.page-about {
  --about-toc-w: 200px;
  background: var(--night);
  color: var(--chalk);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--header-h) + 40px);
  padding-bottom: 40px;
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(33, 255, 186, 0.10), transparent 60%),
    var(--night);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(62%, 700px);
  height: 100%;
  background: linear-gradient(205deg, rgba(255, 106, 43, 0.14), rgba(33, 255, 186, 0.06) 52%, transparent 78%);
  clip-path: polygon(38% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(79, 227, 208, 0.14) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
  margin-top: 28px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(34px, 6vw, 80px);
  line-height: 1.06;
  font-weight: 200;
  letter-spacing: -0.025em;
  color: var(--chalk);
}

.page-about .about-hero__lede {
  margin-top: 22px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(244, 247, 242, 0.78);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__stats {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

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

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--data);
  letter-spacing: -0.02em;
}

.page-about .about-stat__num em {
  font-style: normal;
  font-size: 14px;
  margin-left: 4px;
  color: var(--mist);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 首屏横幅 ---------- */
.page-about .about-banner {
  margin: 34px 0 0;
}

.page-about .about-banner__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% 91%, 0 100%);
}

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

.page-about .about-banner__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 26, 22, 0.12), rgba(6, 26, 22, 0.62));
  pointer-events: none;
}

.page-about .about-banner__caption {
  display: block;
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 布局与目录 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 0;
  padding-top: 8px;
  padding-bottom: 72px;
}

.page-about .about-toc {
  margin: 28px 0 8px;
}

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

.page-about .about-toc .toc__list {
  display: flex;
  gap: 8px;
  margin: 10px 0 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc .toc__link {
  display: inline-block;
  white-space: nowrap;
  padding: 6px 13px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-toc .toc__link:hover {
  color: var(--chalk);
  border-color: var(--data);
}

.page-about .about-toc .toc__link[aria-current="true"] {
  color: var(--night);
  background: var(--data);
  border-color: var(--data);
  font-weight: 600;
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  display: grid;
  gap: 18px;
  padding: 44px 0;
  border-top: 1px solid var(--line);
}

.page-about .chapter:first-child {
  border-top: 0;
  padding-top: 28px;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(52px, 9vw, 100px);
  font-weight: 200;
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: rgba(244, 247, 242, 0.16);
}

.page-about .chapter__body {
  max-width: 720px;
}

.page-about .chapter__body .heading {
  margin: 0 0 18px;
  font-size: clamp(23px, 3.2vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .chapter__body p {
  margin: 0 0 16px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(244, 247, 242, 0.8);
}

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

.page-about .inline-link {
  color: var(--data);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 160ms var(--ease);
}

.page-about .inline-link:hover {
  color: var(--signal);
}

.page-about .aside-note {
  margin: 24px 0;
  padding: 18px 20px;
  border-left: 2px solid var(--signal);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--glass);
}

.page-about .aside-note p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--chalk);
}

.page-about .aside-card {
  margin-top: 24px;
}

.page-about .aside-card .card__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(244, 247, 242, 0.8);
}

/* ---------- 双栏 ---------- */
.page-about .split {
  display: grid;
  gap: 24px;
  margin: 24px 0;
}

.page-about .about-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 26, 22, 0.04), rgba(6, 26, 22, 0.5));
  pointer-events: none;
}

/* ---------- 更新节奏 ---------- */
.page-about .steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .steps__item {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .steps__item:first-child {
  padding-top: 0;
}

.page-about .steps__time {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--data);
  padding-top: 3px;
}

.page-about .steps__title {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--chalk);
}

.page-about .steps__desc {
  margin: 6px 0 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .pace {
  display: block;
  width: 100%;
  height: auto;
  margin: 24px 0 0;
}

.page-about .pace text {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--mist);
}

.page-about .pace .pace__time {
  font-size: 15px;
  fill: var(--data);
}

/* ---------- 团队分工 ---------- */
.page-about .roles {
  margin: 24px 0;
  padding: 0;
  list-style: none;
}

.page-about .roles__item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .roles__num {
  grid-row: span 2;
  font-size: 26px;
  line-height: 1.1;
  color: var(--signal);
}

.page-about .roles__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--chalk);
}

.page-about .roles__desc {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 版本里程碑 ---------- */
.page-about .milestones {
  margin-top: 24px;
}

.page-about .milestone {
  margin-bottom: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
  transition: border-color 180ms var(--ease);
}

.page-about .milestone:hover {
  border-color: rgba(79, 227, 208, 0.5);
}

.page-about .milestone summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .milestone summary::after {
  content: "+";
  margin-left: auto;
  font-size: 20px;
  line-height: 1;
  color: var(--signal);
}

.page-about .milestone[open] summary::after {
  content: "−";
}

.page-about .milestone__phase {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--data);
  white-space: nowrap;
}

.page-about .milestone__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--chalk);
}

.page-about .milestone__body {
  padding: 0 18px 18px;
}

.page-about .milestone__body p {
  margin: 0 0 12px;
  max-width: 38em;
  font-size: 14.5px;
  line-height: 1.74;
  color: rgba(244, 247, 242, 0.78);
}

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

/* ---------- 服务覆盖 ---------- */
.page-about .split--coverage {
  align-items: stretch;
}

.page-about .coverage {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 200px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: rgba(11, 42, 34, 0.72);
  background-image: radial-gradient(rgba(79, 227, 208, 0.4) 1.4px, transparent 1.5px);
  background-size: 22px 22px;
  background-position: 11px 11px;
}

.page-about .coverage::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 35%, rgba(6, 26, 22, 0.85));
  border-radius: inherit;
  pointer-events: none;
}

.page-about .coverage__label {
  position: relative;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--data);
}

.page-about .contact-mini {
  margin-top: 28px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(11, 42, 34, 0.6);
}

.page-about .contact-mini__label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--data);
}

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

.page-about .contact-mini__list li {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.6;
}

.page-about .contact-mini__key {
  color: var(--mist);
}

.page-about .contact-mini__val {
  color: var(--chalk);
  word-break: break-word;
}

.page-about .contact-mini__note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 认可 ---------- */
.page-about .honors {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .honors__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
}

.page-about .honors__year {
  flex: none;
  font-size: 14px;
  color: var(--signal);
  letter-spacing: 0.04em;
}

.page-about .honors__text {
  font-size: 14.5px;
  line-height: 1.6;
  color: rgba(244, 247, 242, 0.84);
}

/* ---------- 结尾 ---------- */
.page-about .about-outro {
  margin-top: 40px;
  padding: 32px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(110% 120% at 100% 0%, rgba(255, 106, 43, 0.16), transparent 62%),
    rgba(11, 42, 34, 0.85);
}

.page-about .about-outro__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.3;
  color: var(--chalk);
}

.page-about .about-outro__text {
  margin: 0 0 22px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.74;
  color: rgba(244, 247, 242, 0.78);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(200px, 0.55fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .chapter {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 28px;
    padding: 56px 0;
  }

  .page-about .split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
    gap: 32px;
  }

  .page-about .split--coverage {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: stretch;
  }

  .page-about .roles__item {
    grid-template-columns: 64px 132px minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .roles__num {
    grid-row: auto;
    font-size: 30px;
  }

  .page-about .about-outro {
    padding: 44px 40px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 64px);
    padding-bottom: 56px;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    gap: 0 56px;
    align-items: start;
    padding-bottom: 96px;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    margin: 64px 0 0;
  }

  .page-about .about-toc .toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc .toc__link {
    padding: 9px 0 9px 14px;
    white-space: normal;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    background: none;
  }

  .page-about .about-toc .toc__link[aria-current="true"] {
    color: var(--chalk);
    background: none;
    border-left-color: var(--signal);
    font-weight: 600;
  }

  .page-about .chapter {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 48px;
    padding: 64px 0;
  }

  .page-about .chapter:first-child {
    padding-top: 64px;
  }
}

@media (min-width: 1280px) {
  .page-about .chapter {
    grid-template-columns: 150px minmax(0, 1fr);
  }

  .page-about .chapter__num {
    font-size: 104px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc .toc__link,
  .page-about .inline-link,
  .page-about .milestone {
    transition: none;
  }
}
<<<END>>>