.page-about {
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 开场 ---------- */
.page-about .about-hero {
  padding-block: clamp(1.5rem, 4vw, 3rem) clamp(2.5rem, 6vw, 5rem);
  background:
    radial-gradient(circle at 82% 18%, rgba(55, 230, 214, 0.08), transparent 46%),
    var(--ink-900);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: end;
}

.page-about .about-hero__eyebrow {
  color: var(--orange);
  margin-block: clamp(1.4rem, 4vw, 2.4rem) clamp(0.9rem, 2vw, 1.4rem);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(1.2rem, 3vw, 1.8rem);
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 34em;
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  line-height: 1.75;
  margin: 0 0 0.9rem;
  color: var(--paper);
}

.page-about .about-hero__lede--dim {
  color: var(--cool-400);
  font-size: 0.95rem;
  border-left: 2px solid var(--orange);
  padding-left: 0.9rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.5rem, 4vw, 2.2rem);
}

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

/* ---------- 页内索引条 ---------- */
.page-about .about-index {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--ink-800);
  border-block: 1px solid var(--hair);
}

.page-about .about-index__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-block: 0.65rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__label {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
  border-right: 1px solid var(--hair);
  padding-right: 0.9rem;
}

.page-about .about-index__list {
  display: flex;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-index__list a {
  display: block;
  white-space: nowrap;
  padding: 0.35rem 0.7rem;
  font-size: 13px;
  color: var(--cool-400);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--paper);
  border-color: var(--orange);
  transform: translateX(-2px);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-sec-head {
  max-width: 46rem;
  margin-bottom: clamp(2rem, 5vw, 3.4rem);
}

.page-about .about-sec-head__title {
  margin: 0.6rem 0 1rem;
  color: var(--paper);
}

.page-about .about-sec-head__text {
  margin: 0;
  color: var(--cool-400);
  line-height: 1.75;
  max-width: 34em;
}

.page-about .about-sec-head--dark .about-sec-head__title {
  color: var(--ink-900);
}

.page-about .about-sec-head--dark .about-sec-head__text {
  color: var(--slate-600);
}

.page-about .about-sec-head__eyebrow {
  color: var(--orange);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  background: linear-gradient(180deg, var(--ink-900), var(--ink-800) 70%, var(--ink-900));
}

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

.page-about .about-tl__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.5rem;
  position: relative;
  padding-block: clamp(1rem, 2.5vw, 1.4rem);
  border-top: 1px solid var(--hair);
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 8px;
  height: 8px;
  background: var(--orange);
  transform: rotate(45deg);
}

.page-about .about-tl__item--now::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(55, 230, 214, 0.18);
}

.page-about .about-tl__year {
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  letter-spacing: 0.04em;
  color: var(--paper);
  line-height: 1;
  padding-left: 1.1rem;
}

.page-about .about-tl__item--now .about-tl__year {
  color: var(--cyan);
}

.page-about .about-tl__body {
  padding-left: 1.1rem;
}

.page-about .about-tl__panel {
  border: 0;
  background: transparent;
}

.page-about .about-tl__panel > summary {
  cursor: pointer;
  list-style: none;
  padding: 0.2rem 0 0.4rem;
}

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

.page-about .about-tl__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.9rem;
}

.page-about .about-tl__tag {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--orange);
  border: 1px solid rgba(255, 106, 43, 0.42);
  padding: 0.15rem 0.5rem;
  flex: none;
}

.page-about .about-tl__name {
  font-size: clamp(1rem, 2.4vw, 1.18rem);
  font-weight: 600;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

.page-about .about-tl__panel > summary:hover .about-tl__name {
  color: var(--orange-soft);
}

.page-about .about-tl__panel .accordion__body {
  border-left: 1px solid var(--hair);
  padding-left: 0.9rem;
  margin-top: 0.5rem;
}

.page-about .about-tl__panel[open] .accordion__body {
  border-left-color: var(--orange);
}

.page-about .about-tl__panel .accordion__body p {
  margin: 0 0 0.7rem;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--cool-400);
  max-width: 36em;
}

.page-about .about-tl__meta {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--dim);
}

/* ---------- 编号拆解（纸面区） ---------- */
.page-about .about-code {
  background: var(--paper);
  color: var(--ink-900);
  border-block: 1px solid var(--warm-200);
}

.page-about .about-code__diagram {
  list-style: none;
  margin: 0 0 clamp(1.8rem, 4vw, 2.6rem);
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--warm-200);
  border: 1px solid var(--warm-200);
}

.page-about .about-code__seg {
  background: var(--paper);
  padding: clamp(1.1rem, 3vw, 1.7rem);
  display: grid;
  gap: 0.45rem;
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-code__seg:hover,
.page-about .about-code__seg:focus-within {
  background: #fffdf8;
  box-shadow: inset 3px 0 0 var(--orange);
}

.page-about .about-code__val {
  font-size: clamp(1.9rem, 6vw, 3rem);
  line-height: 1;
  color: var(--ink-900);
  letter-spacing: 0.02em;
}

.page-about .about-code__seg:hover .about-code__val {
  color: var(--orange);
}

.page-about .about-code__lbl {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate-600);
}

.page-about .about-code__desc {
  margin: 0.35rem 0 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--slate-600);
}

.page-about .about-code__example {
  display: grid;
  gap: 0.6rem;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  border: 1px solid var(--ink-900);
  border-left: 4px solid var(--orange);
  margin-bottom: clamp(1.8rem, 4vw, 2.6rem);
}

.page-about .about-code__example-key {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-code__example-text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ink-900);
  max-width: 46em;
}

.page-about .about-code__example-text a {
  color: var(--ink-900);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s var(--ease);
}

.page-about .about-code__example-text a:hover {
  color: var(--orange);
}

.page-about .about-code__figure {
  margin: 0 0 clamp(1.8rem, 4vw, 2.6rem);
}

.page-about .about-code__states {
  border-top: 1px solid var(--warm-200);
  padding-top: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .about-code__states-title {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  color: var(--ink-900);
  font-weight: 600;
}

.page-about .about-code__states-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-code__states-list li {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.92rem;
  color: var(--slate-600);
  line-height: 1.6;
}

/* ---------- 流程 ---------- */
.page-about .about-process {
  background: var(--ink-900);
}

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

.page-about .about-flow__step {
  background: var(--ink-900);
  padding: clamp(1.2rem, 3vw, 1.9rem) clamp(1rem, 2.5vw, 1.4rem);
  display: grid;
  gap: 0.55rem;
  align-content: start;
  transition: background 0.25s var(--ease);
}

.page-about .about-flow__step:hover {
  background: var(--ink-800);
}

.page-about .about-flow__step .idx {
  color: var(--orange);
}

.page-about .about-flow__title {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--cool-400);
}

.page-about .about-process__note {
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
  max-width: 46em;
  border-left: 2px solid var(--cyan);
  padding-left: 1rem;
}

.page-about .about-process__note p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--cool-400);
}

.page-about .about-process__note a {
  color: var(--paper);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s var(--ease);
}

.page-about .about-process__note a:hover {
  color: var(--orange);
}

/* ---------- 团队与服务 ---------- */
.page-about .about-team {
  background:
    var(--tex-diag),
    var(--ink-800);
  border-block: 1px solid var(--hair);
}

.page-about .about-team__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3rem);
}

.page-about .about-team__lede {
  margin: 0 0 clamp(1.6rem, 4vw, 2.2rem);
  color: var(--cool-400);
  line-height: 1.8;
  max-width: 36em;
}

.page-about .about-team__grid {
  list-style: none;
  margin: 0 0 clamp(2rem, 5vw, 2.8rem);
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-team__card {
  border: 1px solid var(--hair);
  padding: clamp(1.1rem, 3vw, 1.5rem);
  background: rgba(11, 27, 43, 0.55);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-team__card:hover {
  border-color: var(--orange);
  transform: translateX(-2px);
}

.page-about .about-team__num {
  display: block;
  font-size: 1.7rem;
  line-height: 1;
  color: var(--cyan);
  margin-bottom: 0.6rem;
}

.page-about .about-team__card-title {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--cool-400);
}

.page-about .about-team__sub {
  margin: 0 0 0.8rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-team__network > p {
  margin: 0 0 1.2rem;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--cool-400);
  max-width: 36em;
}

.page-about .about-team__facts {
  margin: 0;
  display: grid;
  gap: 0.7rem;
  border-top: 1px solid var(--hair);
  padding-top: 1.1rem;
}

.page-about .about-team__facts > div {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr);
  gap: 0.8rem;
  align-items: baseline;
}

.page-about .about-team__facts dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--dim);
}

.page-about .about-team__facts dd {
  margin: 0;
  font-size: 0.9rem;
  color: var(--paper);
  word-break: break-word;
}

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

/* ---------- 资质 ---------- */
.page-about .about-creds {
  background: var(--paper);
  color: var(--ink-900);
}

.page-about .about-creds__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--warm-200);
  border: 1px solid var(--warm-200);
  margin-bottom: clamp(1.8rem, 4vw, 2.6rem);
}

.page-about .about-creds__card {
  background: var(--paper);
  border: 0;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  border-left: 3px solid transparent;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-creds__card:hover {
  border-left-color: var(--orange);
  background: #fffdf8;
}

.page-about .about-creds__card-title {
  margin: 0 0 0.55rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .about-creds__card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--slate-600);
}

.page-about .about-creds__strip {
  border-top: 1px solid var(--ink-900);
  border-bottom: 1px solid var(--ink-900);
  padding-block: clamp(1rem, 2.5vw, 1.4rem);
  display: grid;
  gap: 0.9rem;
  margin-bottom: clamp(1.8rem, 4vw, 2.4rem);
}

.page-about .about-creds__strip-key {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-creds__strip-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.8rem;
}

.page-about .about-creds__strip-list li {
  font-size: 0.85rem;
  color: var(--slate-600);
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.page-about .about-creds__strip-list .mono {
  font-size: 1.15rem;
  color: var(--ink-900);
}

.page-about .about-creds__cta {
  display: grid;
  gap: 1rem;
  align-items: center;
}

.page-about .about-creds__cta > p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--slate-600);
  max-width: 34em;
}

.page-about .about-creds__cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

/* ---------- 图片与媒体补充 ---------- */
.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-code .media {
  background: var(--warm-200);
}

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

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

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

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

  .page-about .about-creds__cta {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(2rem, 4vw, 4rem);
  }

  .page-about .about-tl__item {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    gap: 0;
    padding-block: 0;
  }

  .page-about .about-tl__item::before {
    left: 8.5rem;
    top: 1.9rem;
    transform: translate(-50%, -50%) rotate(45deg);
  }

  .page-about .about-tl__year {
    position: sticky;
    top: 4.2rem;
    align-self: start;
    padding: 1.1rem 1.4rem 0 0;
    font-size: 1.7rem;
  }

  .page-about .about-tl__body {
    border-left: 1px solid var(--hair);
    padding: 1rem 0 1.4rem 2rem;
  }

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

  .page-about .about-code__example {
    grid-template-columns: 5rem minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-code__example-key {
    padding-top: 0.2rem;
  }

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

  .page-about .about-team__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .about-team__figure {
    position: sticky;
    top: 4.4rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about * ,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible,
  .page-about .about-team__card:hover {
    transform: none;
  }
}