.page-about {
  --about-rail: 172px;
  --about-node: 10px;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

.page-about .about-head {
  max-width: 46rem;
  margin-bottom: 40px;
}

.page-about .about-head .lede {
  margin-top: 14px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: 8px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: center;
}

.page-about .about-hero__lead .lede {
  margin-top: 20px;
}

.page-about .about-hero__aside {
  margin-top: 18px;
  padding-left: 16px;
  border-left: 2px solid var(--signal);
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
  max-width: 34rem;
}

.page-about .about-hero__aside a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(35, 211, 176, 0.4);
  transition: border-color var(--t-fast), color var(--t-fast);
}

.page-about .about-hero__aside a:hover,
.page-about .about-hero__aside a:focus-visible {
  color: var(--mist);
  border-bottom-color: var(--signal);
}

.page-about .about-hero__media {
  margin: 0;
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
    gap: clamp(32px, 5vw, 72px);
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__media {
    transform: translateX(24px);
  }
}

/* ---------- 我们做什么 ---------- */

.page-about .about-what {
  background: linear-gradient(180deg, rgba(18, 62, 90, 0.35), rgba(4, 24, 38, 0));
}

.page-about .about-what__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.page-about .about-what__grid .h-serif {
  margin-bottom: 20px;
}

.page-about .about-what__card {
  display: flex;
  flex-direction: column;
}

.page-about .about-what__key {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-top: 16px;
}

.page-about .about-what__key:first-child {
  margin-top: 0;
}

.page-about .about-what__card .chip-mono {
  margin-top: 6px;
}

.page-about .about-what__desc {
  margin-top: 20px;
  font-size: 15px;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .about-what__card .card__foot {
  margin-top: auto;
}

@media (min-width: 900px) {
  .page-about .about-what__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(260px, 0.85fr);
    gap: clamp(32px, 4vw, 64px);
  }
}

/* ---------- 版本演进 ---------- */

.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .year-rail {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .year-rail__title {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}

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

.page-about .year-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--t-fast), border-color var(--t-fast), background-color var(--t-fast);
}

.page-about .year-rail__link:hover,
.page-about .year-rail__link:focus-visible,
.page-about .year-rail__link[aria-current="true"] {
  color: var(--mist);
  border-color: var(--signal);
  background: rgba(255, 122, 47, 0.09);
}

.page-about .year-rail__idx {
  font-size: 11px;
  color: var(--signal);
  letter-spacing: 0.1em;
}

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

.page-about .about-timeline__figure {
  margin: 0 0 36px;
}

.page-about .stages {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .stages::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 34px;
  width: 1px;
  background: var(--line);
}

.page-about .stage {
  position: relative;
  padding-left: 32px;
  padding-bottom: 34px;
}

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

.page-about .stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: var(--about-node);
  height: var(--about-node);
  background: var(--panel);
  border: 1px solid var(--signal);
  transition: background-color var(--t-fast), transform var(--t-fast);
}

.page-about .stage:hover::before {
  background: var(--signal);
  transform: translateX(2px);
}

.page-about .stage__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--signal);
  margin-bottom: 8px;
}

.page-about .stage__title {
  font-family: var(--f-serif);
  font-size: 21px;
  line-height: 1.4;
  color: var(--mist);
  margin-bottom: 10px;
  font-weight: 600;
}

.page-about .stage p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 38em;
}

.page-about .stage__meta {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 10px;
  background: rgba(30, 78, 107, 0.35);
  border: 1px solid var(--line);
  color: var(--fade);
  font-size: 12px;
  letter-spacing: 0.08em;
}

@media (min-width: 900px) {
  .page-about .about-timeline__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .year-rail {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-top: 0;
    padding-left: 18px;
    position: sticky;
    top: 24px;
    align-self: start;
  }

  .page-about .year-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 6px;
  }

  .page-about .year-rail__link {
    width: 100%;
  }
}

/* ---------- 兼容适配 ---------- */

.page-about .about-compat {
  background: var(--hull);
}

.page-about .about-compat__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-compat__intro h2 {
  margin-bottom: 18px;
}

.page-about .about-compat__intro p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 34rem;
}

.page-about .compat-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .compat-step {
  background: var(--abyss);
  padding: 22px 20px;
  transition: background-color var(--t-base);
}

.page-about .compat-step:hover {
  background: var(--deep);
}

.page-about .compat-step__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin-bottom: 10px;
}

.page-about .compat-step h3 {
  font-size: 17px;
  color: var(--mist);
  margin-bottom: 8px;
}

.page-about .compat-step p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .note-block {
  margin-top: 32px;
  padding: 18px 20px;
  border-left: 3px solid var(--amber);
  background: rgba(255, 194, 75, 0.07);
  color: var(--fade);
  font-size: 15px;
  line-height: 1.8;
  max-width: 52rem;
}

@media (min-width: 900px) {
  .page-about .about-compat__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .compat-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 团队分工 ---------- */

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

.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-cell {
  background: var(--panel);
  padding: 24px 20px;
  transition: background-color var(--t-base), box-shadow var(--t-base);
}

.page-about .team-cell:hover {
  background: var(--deep);
  box-shadow: inset 0 0 0 1px var(--signal);
}

.page-about .team-cell__mark {
  display: block;
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--signal);
  position: relative;
  margin-bottom: 16px;
}

.page-about .team-cell__mark::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 4px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

.page-about .team-cell h3 {
  font-family: var(--f-serif);
  font-size: 20px;
  color: var(--mist);
  margin-bottom: 12px;
  font-weight: 600;
}

.page-about .team-cell p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .team-cell p + p {
  margin-top: 8px;
}

@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 内容体系 ---------- */

.page-about .about-content__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.page-about .about-content__grid .h-serif {
  margin-bottom: 20px;
}

.page-about .about-content__panel {
  background: var(--deep);
  border: 1px solid var(--line);
  padding: 24px 20px;
}

.page-about .content-stats {
  margin: 0;
  display: grid;
  gap: 18px;
}

.page-about .content-stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(30, 78, 107, 0.6);
}

.page-about .content-stat:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .content-stat dt {
  font-size: 14px;
  color: var(--fade);
}

.page-about .content-stat dd {
  margin: 0;
  font-size: 15px;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .content-stat__num {
  font-size: 22px;
  color: var(--signal);
  margin-right: 4px;
}

.page-about .about-content__link {
  display: inline-block;
  margin-top: 24px;
}

@media (min-width: 900px) {
  .page-about .about-content__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.9fr);
    gap: clamp(32px, 5vw, 72px);
  }
}

/* ---------- 服务范围 ---------- */

.page-about .about-service__panel {
  background: var(--hull);
  border: 1px solid var(--line);
  padding: clamp(24px, 4vw, 48px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-service__text h2 {
  margin-bottom: 18px;
}

.page-about .about-service__text p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 36rem;
}

.page-about .about-service__text p + p {
  margin-top: 14px;
}

.page-about .about-service__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .about-service__list li {
  background: var(--abyss);
  padding: 16px 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  justify-content: space-between;
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-service__key {
  color: var(--fade);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.page-about .about-service__contact {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  background: rgba(18, 62, 90, 0.32);
}

.page-about .about-service__contact-label {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--fade);
  margin-bottom: 6px;
}

.page-about .about-service__contact-value {
  font-size: 16px;
  color: var(--mist);
  word-break: break-all;
}

.page-about .about-service__copy {
  flex: none;
}

.page-about .about-service__legal {
  flex: 1 1 100%;
  font-size: 13px;
  color: var(--fade);
  line-height: 1.8;
  padding-top: 14px;
  border-top: 1px solid rgba(30, 78, 107, 0.6);
}

@media (min-width: 900px) {
  .page-about .about-service__panel {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 0.85fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: center;
  }
}

/* ---------- 状态点呼吸与减弱动效 ---------- */

.page-about .dot--live {
  animation: about-breathe 2s ease-in-out infinite;
}

@keyframes about-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .dot--live {
    animation: none;
  }

  .page-about .stage:hover::before,
  .page-about .about-hero__media {
    transform: none;
  }
}
</｜｜DSML｜｜ parameter>
</｜｜DSML｜｜ invoke>
</｜｜DSML｜｜ calls>