.page-about {
  --ab-shell: rgba(22, 32, 74, .55);
  --ab-shell-strong: rgba(22, 32, 74, .88);
  --ab-text-soft: rgba(244, 241, 234, .82);
  --ab-text-mute: rgba(244, 241, 234, .68);
  color: var(--stone-white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 44px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-grid) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -160px;
  right: -150px;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(56, 242, 208, .13), transparent 68%);
  pointer-events: none;
}

.page-about .hero-frame {
  position: relative;
  z-index: 1;
  padding: 24px 20px 22px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: linear-gradient(155deg, rgba(22, 32, 74, .78), rgba(14, 22, 51, .26));
}

.page-about .hero-frame::before,
.page-about .hero-frame::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid var(--wood);
  opacity: .72;
}

.page-about .hero-frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
  border-radius: var(--radius) 0 0 0;
}

.page-about .hero-frame::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
  border-radius: 0 0 var(--radius) 0;
}

.page-about .about-hero h1 {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.85rem, 6.4vw, 3.6rem);
  line-height: 1.14;
  letter-spacing: -.01em;
  max-width: 18em;
}

.page-about .ab-lede {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: 1.0313rem;
  line-height: 1.9;
  color: var(--ab-text-soft);
}

.page-about .ab-p {
  margin: 0 0 14px;
  max-width: 37em;
  line-height: 1.9;
  color: var(--ab-text-soft);
}

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

.page-about .hero-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin-top: 22px;
}

/* ---------- 区块节奏 ---------- */
.page-about .ab-section {
  padding: 48px 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-section--start {
  padding-bottom: 64px;
}

.page-about .sec-head {
  display: grid;
  gap: 12px;
  margin-bottom: 22px;
}

.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 4.6vw, 2.2rem);
  line-height: 1.24;
}

.page-about .ab-grid {
  display: grid;
  gap: var(--gap);
}

/* ---------- 我们是谁 ---------- */
.page-about .about-facts {
  padding: 20px 20px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ab-shell);
}

.page-about .about-facts__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--wood-hi);
  font-weight: 500;
}

.page-about .facts {
  margin: 0;
  display: grid;
}

.page-about .facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .facts__row:last-child {
  border-bottom: 0;
}

.page-about .facts dt {
  font-size: .875rem;
  color: var(--stone-gray);
}

.page-about .facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  color: var(--cyan);
}

/* ---------- 团队与分工 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
}

.page-about .filter-btn {
  cursor: pointer;
}

.page-about .team-list {
  display: grid;
  gap: 12px;
}

.page-about .team-row {
  display: grid;
  gap: 8px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--wood);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(90deg, var(--ab-shell-strong), rgba(22, 32, 74, .3));
}

.page-about .team-row.is-filtered-out {
  display: none;
}

.page-about .team-row__role {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: .9375rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--wood-hi);
}

.page-about .team-row__count {
  font-size: .7813rem;
  color: var(--gold);
  letter-spacing: .06em;
}

.page-about .team-row__val {
  margin: 0;
  line-height: 1.8;
  color: var(--ab-text-soft);
}

/* ---------- 图片 ---------- */
.page-about .ab-media {
  margin: 26px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-1);
}

.page-about .ab-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 9;
  filter: saturate(.86) contrast(1.04);
}

.page-about .ab-media--archive img {
  aspect-ratio: 3 / 2;
}

.page-about .ab-media--city img {
  aspect-ratio: 16 / 7;
}

.page-about .ab-media__cap {
  padding: 10px 16px 12px;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--stone-gray);
  border-top: 1px solid var(--line);
}

/* ---------- 生产流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow__step {
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(22, 32, 74, .68), rgba(19, 28, 64, .34));
}

.page-about .flow__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 1.75rem;
  line-height: 1;
  color: var(--gold);
}

.page-about .flow__step h3 {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
}

.page-about .flow__step p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--ab-text-mute);
}

/* ---------- 发展历程 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 26px;
  display: grid;
  gap: 14px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(212, 162, 76, .08));
}

.page-about .timeline__item {
  position: relative;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 14px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(212, 162, 76, .16);
}

.page-about .timeline__item details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(22, 32, 74, .48);
  overflow: hidden;
}

.page-about .timeline__item summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
  transition: background .24s var(--ease);
}

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

.page-about .timeline__item summary:hover {
  background: rgba(56, 242, 208, .06);
}

.page-about .timeline__item details[open] summary {
  border-bottom: 1px solid var(--line);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  color: var(--gold);
  letter-spacing: .04em;
}

.page-about .tl-label {
  font-size: .875rem;
  color: var(--ab-text-soft);
}

.page-about .tl-body {
  padding: 12px 14px 14px;
}

.page-about .tl-body p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--ab-text-mute);
}

/* ---------- 资质与合规 ---------- */
.page-about .cert-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .cert-row {
  display: grid;
  gap: 6px;
  padding: 15px 2px;
  border-bottom: 1px solid var(--line);
}

.page-about .cert-row__k {
  font-family: var(--font-mono);
  font-size: .7813rem;
  letter-spacing: .1em;
  color: var(--stone-gray);
}

.page-about .cert-row__v {
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--stone-white);
  word-break: break-word;
}

.page-about .cert-row__n {
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--stone-gray);
}

.page-about .copy-btn {
  justify-self: start;
  padding: 6px 12px;
  font-size: .7813rem;
  cursor: pointer;
}

/* ---------- 共建生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .eco-card {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(22, 32, 74, .62), rgba(14, 22, 51, .3));
}

.page-about .eco-card h3 {
  margin: 0 0 10px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--wood-hi);
}

.page-about .eco-card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--ab-text-mute);
}

/* ---------- 收尾入口 ---------- */
.page-about .start-band {
  padding: 26px 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 88% 8%, rgba(122, 107, 255, .16), transparent 60%),
    linear-gradient(160deg, rgba(22, 32, 74, .8), rgba(14, 22, 51, .34));
}

.page-about .start-band h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 4.2vw, 1.9rem);
}

.page-about .start-band > p {
  margin: 0 0 20px;
  max-width: 34em;
  line-height: 1.85;
  color: var(--ab-text-soft);
}

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

.page-about .start-link {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--stone-white);
  text-decoration: none;
  font-weight: 700;
  transition: border-color .24s var(--ease), background .24s var(--ease);
}

.page-about .start-link span {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: .875rem;
  color: var(--stone-gray);
}

.page-about .start-link:hover,
.page-about .start-link:focus-visible {
  border-color: rgba(56, 242, 208, .6);
  background: rgba(56, 242, 208, .06);
}

.page-about .start-link:focus-visible,
.page-about .copy-btn:focus-visible,
.page-about .filter-btn:focus-visible,
.page-about .timeline__item summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .cert-row {
    grid-template-columns: 150px 1fr auto;
    align-items: center;
    gap: 18px;
  }

  .page-about .cert-row__v {
    grid-column: 2;
  }

  .page-about .cert-row__n {
    grid-column: 2;
  }

  .page-about .copy-btn {
    grid-column: 3;
    grid-row: 1;
  }
}

@media (min-width: 760px) {
  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .team-row {
    grid-template-columns: 214px 1fr;
    gap: 4px 24px;
    align-items: baseline;
  }
}

@media (min-width: 860px) {
  .page-about .ab-grid--split {
    grid-template-columns: 1.2fr .8fr;
    align-items: start;
  }

  .page-about .ab-grid--split-rev {
    grid-template-columns: .82fr 1.18fr;
    align-items: start;
  }

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

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

  .page-about .hero-frame {
    padding: 32px 30px 28px;
  }

  .page-about .ab-section {
    padding: 64px 0;
  }
}

@media (min-width: 1040px) {
  .page-about .about-hero {
    padding: 40px 0 56px;
  }

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

  .page-about .timeline {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 0 14px;
    padding: 40px 0 0;
  }

  .page-about .timeline::before {
    left: 4px;
    right: 6px;
    top: 11px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, rgba(212, 162, 76, .18), var(--gold) 42%, var(--cyan));
  }

  .page-about .timeline__item::before {
    left: 0;
    top: -34px;
  }

  .page-about .timeline__item summary {
    flex-direction: column;
    gap: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .start-link,
  .page-about .timeline__item summary {
    transition: none;
  }
}