.page-about {
  --about-pad: clamp(2.5rem, 5.5vw, 4.5rem);
  background:
    radial-gradient(1100px 560px at 88% -8%, rgba(43, 36, 72, .55), transparent 70%),
    radial-gradient(900px 520px at 4% 42%, rgba(74, 31, 43, .3), transparent 72%),
    linear-gradient(180deg, var(--c-abyss) 0%, #04121f 58%, var(--c-abyss) 100%);
  color: var(--ink-1);
  font-family: var(--font-body);
  font-size: var(--step-body);
  line-height: 1.75;
  overflow-x: hidden;
}

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

.page-about .section-title {
  color: var(--c-mist);
  letter-spacing: -.005em;
}

.page-about .section-title::after {
  content: "";
  display: block;
  width: 2.4rem;
  height: 2px;
  margin-top: .9rem;
  background: linear-gradient(90deg, var(--c-gold), transparent);
}

.page-about .section-lede {
  color: var(--ink-2);
  max-width: 48em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.25rem, 3.5vw, 2.5rem) 0 clamp(2.5rem, 5.5vw, 4.25rem);
  border-bottom: 1px solid var(--line-gold-soft);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, var(--line-gold-soft) 0 1px, transparent 1px 76px);
  opacity: .38;
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 32%, transparent 94%);
  mask-image: linear-gradient(180deg, transparent 0%, #000 32%, transparent 94%);
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  margin-top: clamp(1.5rem, 3vw, 2.5rem);
  align-items: start;
}

.page-about .hero-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: .2em;
  color: var(--c-gold);
  margin: 0;
}

.page-about .hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.9rem, 3.7vw, 3.15rem);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--c-mist);
  margin: .7rem 0 1rem;
  max-width: 15em;
}

.page-about .hero-lede {
  margin: 0;
  max-width: 40em;
  color: var(--ink-2);
  font-size: clamp(.95rem, 1.05vw, 1.05rem);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.6rem;
}

.page-about .hero-file {
  position: relative;
  padding: 1.25rem 1.2rem 1.1rem;
  background: linear-gradient(165deg, rgba(13, 44, 68, .92), rgba(6, 24, 38, .72));
  border: 1px solid var(--line-gold);
  box-shadow: var(--shadow-panel);
}

.page-about .hero-file::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-coral), var(--c-gold) 46%, transparent);
}

.page-about .file-head {
  margin: 0 0 .9rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  color: var(--c-gold);
}

.page-about .file-list {
  margin: 0;
  display: grid;
  gap: .55rem;
}

.page-about .file-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px dashed var(--line-faint);
}

.page-about .file-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .file-row dt {
  color: var(--ink-3);
  font-size: .84rem;
  white-space: nowrap;
}

.page-about .file-row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--c-mist);
  text-align: right;
  word-break: break-word;
}

/* ---------- 来历 ---------- */
.page-about .origin {
  padding: var(--about-pad) 0;
}

.page-about .origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}

.page-about .origin-copy p {
  color: var(--ink-2);
  margin: 1rem 0 0;
  max-width: 42em;
}

.page-about .origin-points {
  list-style: none;
  margin: 1.35rem 0 0;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .origin-points li {
  position: relative;
  padding-left: 1.4rem;
  color: var(--ink-2);
  font-size: .93rem;
}

.page-about .origin-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .58em;
  width: .58rem;
  height: .58rem;
  border: 1px solid var(--c-gold);
  transform: rotate(45deg);
}

.page-about .origin-media,
.page-about .eco-media,
.page-about .tl-figure {
  margin: 0;
  border: 1px solid var(--line-gold-soft);
  background: linear-gradient(150deg, rgba(43, 36, 72, .55), rgba(6, 24, 38, .6));
  padding: .5rem;
}

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

.page-about .media-caption {
  display: block;
  padding: .6rem .35rem .25rem;
  font-size: .82rem;
  line-height: 1.6;
  color: var(--ink-3);
}

/* ---------- 版本时间轴 ---------- */
.page-about .timeline {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line-faint);
}

.page-about .tl-jump {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1.6rem 0 1.75rem;
}

.page-about .tl-jump-link {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  padding: .42rem .8rem;
  color: var(--ink-2);
  text-decoration: none;
  border: 1px solid var(--line-gold-soft);
  background: rgba(13, 44, 68, .5);
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .tl-jump-link:hover,
.page-about .tl-jump-link:focus-visible {
  color: var(--c-abyss);
  background: var(--c-gold-bright);
  border-color: var(--c-gold-bright);
}

.page-about .tl-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .7rem;
  padding: 1.15rem 1.15rem 1.2rem 1.35rem;
  background: linear-gradient(120deg, rgba(13, 44, 68, .85), rgba(6, 24, 38, .45));
  border: 1px solid var(--line-faint);
  border-left: 2px solid var(--c-gold);
  scroll-margin-top: 6rem;
  transition: border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .tl-item:target {
  border-color: var(--c-gold);
  background: linear-gradient(120deg, rgba(43, 36, 72, .88), rgba(6, 24, 38, .55));
}

.page-about .tl-index {
  display: flex;
  align-items: baseline;
  gap: .6rem;
}

.page-about .tl-ver {
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 2.4vw, 1.95rem);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--c-gold);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: .74rem;
  color: var(--ink-3);
  letter-spacing: .1em;
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-size: var(--step-h3);
  color: var(--c-mist);
  margin: 0 0 .4rem;
}

.page-about .tl-body p {
  margin: 0;
  color: var(--ink-2);
  font-size: .93rem;
}

.page-about .tl-tag {
  display: inline-block;
  margin: .8rem 0 0 !important;
  padding: .2rem .55rem;
  font-family: var(--font-mono);
  font-size: .7rem !important;
  letter-spacing: .1em;
  color: var(--c-teal) !important;
  border: 1px solid rgba(60, 198, 180, .38);
}

.page-about .tl-figure {
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
}

/* ---------- 团队 ---------- */
.page-about .teams {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line-faint);
}

.page-about .team-chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1.5rem 0 1.75rem;
  padding: 0;
}

.page-about .team-chip {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .73rem;
  letter-spacing: .06em;
  padding: .4rem .75rem;
  color: var(--ink-2);
  text-decoration: none;
  border: 1px solid var(--line-gold-soft);
  background: rgba(6, 24, 38, .6);
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .team-chip:hover,
.page-about .team-chip:focus-visible {
  color: var(--c-abyss);
  background: var(--c-gold);
  border-color: var(--c-gold);
}

.page-about .team-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .team-card {
  position: relative;
  padding: 1.5rem 1.2rem 1.3rem;
  background: linear-gradient(160deg, rgba(27, 42, 56, .85), rgba(6, 24, 38, .72));
  border: 1px solid var(--line-faint);
  border-top: 2px solid var(--c-gold);
  scroll-margin-top: 6rem;
  transition: transform .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .team-card:target {
  border-color: var(--c-gold);
  border-top-color: var(--c-coral);
  background: linear-gradient(160deg, rgba(43, 36, 72, .9), rgba(6, 24, 38, .75));
}

.page-about .team-idx {
  display: block;
  margin-bottom: .55rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--c-gold);
}

.page-about .team-idx::before {
  content: "";
  display: inline-block;
  width: .44rem;
  height: .44rem;
  margin-right: .45rem;
  border-radius: 50%;
  background: var(--c-teal);
  vertical-align: middle;
}

.page-about .team-name {
  font-family: var(--font-display);
  font-size: var(--step-h3);
  color: var(--c-mist);
  margin: 0;
}

.page-about .team-role {
  margin: .2rem 0 .7rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--c-gold-bright);
}

.page-about .team-desc {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--ink-2);
}

.page-about .team-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin: .95rem 0 0;
  padding: 0;
}

.page-about .team-tags li {
  font-family: var(--font-mono);
  font-size: .67rem;
  letter-spacing: .05em;
  padding: .18rem .45rem;
  color: var(--c-teal);
  border: 1px solid rgba(60, 198, 180, .3);
}

/* ---------- 服务标准 ---------- */
.page-about .quality {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line-faint);
}

.page-about .quality-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-about .quality-intro p {
  color: var(--ink-2);
  margin: 1rem 0 0;
  max-width: 34em;
}

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

.page-about .quality-list li {
  display: grid;
  grid-template-columns: 1.9rem minmax(0, 1fr);
  gap: .9rem;
  align-items: start;
  padding: 1rem 0 1.05rem;
  border-bottom: 1px solid var(--line-faint);
}

.page-about .quality-list li:first-child {
  border-top: 1px solid var(--line-faint);
}

.page-about .q-idx {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--c-coral);
  padding-top: .2rem;
}

.page-about .quality-list h3 {
  font-family: var(--font-display);
  font-size: 1.03rem;
  color: var(--c-mist);
  margin: 0 0 .3rem;
}

.page-about .quality-list p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--ink-2);
}

/* ---------- 生态与荣誉 ---------- */
.page-about .ecosystem {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line-faint);
}

.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: center;
}

.page-about .eco-copy p {
  color: var(--ink-2);
  margin: 1rem 0 0;
  max-width: 40em;
}

.page-about .eco-list {
  list-style: none;
  margin: 1.35rem 0 0;
  padding: 0;
  display: grid;
  gap: .1rem;
}

.page-about .eco-list li {
  display: grid;
  grid-template-columns: 3.6rem minmax(0, 1fr);
  gap: .8rem;
  padding: .7rem 0;
  border-bottom: 1px dashed var(--line-faint);
  font-size: .9rem;
  line-height: 1.7;
  color: var(--ink-2);
}

.page-about .eco-key {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--c-gold-bright);
  padding-top: .18rem;
}

.page-about .honors {
  margin-top: clamp(2rem, 4vw, 3rem);
}

.page-about .honor-title {
  font-family: var(--font-display);
  font-size: var(--step-h3);
  color: var(--c-mist);
  margin: 0 0 1rem;
}

.page-about .honor-track {
  list-style: none;
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: 0 0 .8rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .honor-track li {
  flex: 0 0 auto;
  scroll-snap-align: start;
  width: min(82vw, 360px);
  padding: 1.15rem 1.2rem 1.2rem;
  background: linear-gradient(150deg, rgba(74, 31, 43, .88), rgba(6, 24, 38, .72));
  border: 1px solid var(--line-gold-soft);
  border-left: 2px solid var(--c-gold);
}

.page-about .honor-year {
  display: block;
  margin-bottom: .45rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--c-gold-bright);
}

.page-about .honor-name {
  font-family: var(--font-display);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--c-mist);
  margin: 0 0 .4rem;
}

.page-about .honor-note {
  margin: 0;
  font-size: .84rem;
  line-height: 1.65;
  color: var(--ink-2);
}

/* ---------- 下一步 ---------- */
.page-about .next-step {
  padding: var(--about-pad) 0 clamp(3rem, 6vw, 5rem);
  border-top: 1px solid var(--line-gold-soft);
}

.page-about .next-grid {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .75rem;
  margin: 1.6rem 0 0;
  padding: 0;
}

.page-about .next-link {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  height: 100%;
  padding: 1.15rem 1.1rem 1.2rem;
  text-decoration: none;
  border: 1px solid var(--line-gold-soft);
  background: rgba(13, 44, 68, .42);
  transition: border-color .22s var(--ease), background .22s var(--ease), transform .22s var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  border-color: var(--c-gold);
  background: rgba(43, 36, 72, .78);
  transform: translateY(-3px);
}

.page-about .next-idx {
  font-family: var(--font-mono);
  font-size: .71rem;
  letter-spacing: .16em;
  color: var(--c-coral);
}

.page-about .next-name {
  font-family: var(--font-display);
  font-size: 1.06rem;
  color: var(--c-mist);
}

.page-about .next-desc {
  font-size: .84rem;
  line-height: 1.65;
  color: var(--ink-3);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .team-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .6fr);
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-about .quality-grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
  }

  .page-about .eco-grid {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  }

  .page-about .tl-item {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 1.35rem;
    align-items: start;
    padding: 1.35rem 1.5rem 1.4rem 1.6rem;
  }

  .page-about .tl-index {
    flex-direction: column;
    align-items: flex-start;
    gap: .35rem;
  }
}

@media (min-width: 1060px) {
  .page-about .team-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    padding-bottom: 1.5rem;
  }

  .page-about .team-card:nth-child(2),
  .page-about .team-card:nth-child(5) {
    transform: translateY(1.35rem);
  }

  .page-about .team-card:target {
    transform: translateY(1.35rem);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-jump-link,
  .page-about .team-chip,
  .page-about .team-card,
  .page-about .next-link,
  .page-about .tl-item {
    transition: none;
  }

  .page-about .next-link:hover,
  .page-about .next-link:focus-visible {
    transform: none;
  }
}