.page-about {
  --about-gap: clamp(18px, 3vw, 32px);
  color: var(--paper);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: clamp(18px, 3vw, 28px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .breadcrumb__link {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--line-cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 44px) 0 clamp(40px, 6vw, 76px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 620px;
  background:
    radial-gradient(48% 52% at 18% 12%, rgba(255, 107, 74, .22), transparent 68%),
    radial-gradient(46% 46% at 82% 4%, rgba(45, 226, 230, .16), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  position: relative;
}

.page-about .about-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 7.4vw, 4.9rem);
  line-height: 1.02;
  letter-spacing: -.018em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.8;
  color: var(--paper);
  opacity: .85;
}

.page-about .about-hero__note {
  align-self: end;
  padding: 18px 20px;
  border: 2px solid var(--panel);
  border-left: 4px solid var(--coral);
  background: rgba(10, 42, 64, .62);
  box-shadow: var(--shadow-hard);
}

.page-about .about-hero__note-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--sand);
}

.page-about .about-hero__note-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--paper);
  opacity: .85;
}

.page-about .about-hero__note-list span {
  display: inline-block;
  min-width: 62px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: clamp(30px, 5vw, 54px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
  position: relative;
}

.page-about .about-stats li {
  padding: 18px 14px 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-stats b {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.8rem, 4.4vw, 2.7rem);
  line-height: 1;
  color: var(--coral);
}

.page-about .about-stats span {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding: clamp(44px, 6vw, 78px) 0;
}

.page-about .about-section--tint {
  background: var(--ink-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-section .lede {
  max-width: 62ch;
  margin-top: 14px;
  line-height: 1.85;
  color: var(--paper);
  opacity: .8;
}

.page-about .about-section .section-title {
  margin-top: 10px;
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

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

.page-about .figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(26px, 4vw, 38px) 0 clamp(20px, 3vw, 30px);
  padding: 0;
  list-style: none;
}

.page-about .timeline-jump a {
  display: inline-block;
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--paper);
  text-decoration: none;
  border: 1px solid var(--line);
  transition: color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .timeline-jump a:hover,
.page-about .timeline-jump a:focus-visible {
  color: var(--cyan);
  border-color: var(--line-cyan);
  transform: translateY(-2px);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 0 30px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--coral), var(--sand) 46%, var(--cyan));
  opacity: .55;
}

.page-about .tl-entry {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 0 0 clamp(28px, 4vw, 42px);
}

.page-about .tl-entry::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 9px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--sand);
  background: var(--ink);
}

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

.page-about .tl-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--sand);
}

.page-about .tl-body {
  min-width: 0;
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 2.6vw, 1.6rem);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .tl-text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
  opacity: .78;
}

.page-about .tl-aside {
  padding: 11px 14px;
  border: 2px solid var(--panel);
  border-left: 3px solid var(--coral);
  background: rgba(18, 63, 92, .55);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.65;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .team-index {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  transition: background-color .25s var(--ease), padding-left .25s var(--ease);
}

.page-about .team-row:hover {
  background: rgba(45, 226, 230, .05);
  padding-left: 10px;
}

.page-about .team-row__no {
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--sand);
}

.page-about .team-row__name {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .team-row__count {
  display: inline-block;
  margin-left: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--coral);
  vertical-align: middle;
}

.page-about .team-row__desc {
  grid-column: 2;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--paper);
  opacity: .76;
}

.page-about .team-figure {
  margin: 0;
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .flow-step {
  border: 2px solid var(--panel);
  background: rgba(10, 42, 64, .5);
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .flow-step[open] {
  border-color: var(--line-cyan);
  box-shadow: var(--shadow-hard);
}

.page-about .flow-step summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.35;
  color: var(--paper);
}

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

.page-about .flow-step summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

.page-about .flow-step__no {
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 400;
  letter-spacing: .12em;
  color: var(--void);
  background: var(--coral);
}

.page-about .flow-step p {
  margin: 0;
  padding: 0 16px 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--paper);
  opacity: .8;
}

.page-about .flow-side {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 36px);
  margin-top: clamp(28px, 4vw, 42px);
}

.page-about .flow-figure {
  margin: 0;
}

.page-about .rhythm {
  padding: clamp(20px, 3vw, 28px);
  border: 2px solid var(--line);
  border-top: 4px solid var(--sand);
  background: rgba(18, 63, 92, .4);
}

.page-about .rhythm__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--paper);
}

.page-about .rhythm__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper);
  opacity: .82;
}

.page-about .rhythm__list .mono {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--cyan);
  opacity: 1;
}

/* ---------- 生态 ---------- */
.page-about .eco-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(26px, 4vw, 36px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .eco-cell {
  padding: clamp(20px, 3vw, 30px);
  background: var(--panel);
}

.page-about .eco-cell b {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 5.4vw, 3.2rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .eco-cell span {
  display: block;
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--paper);
  opacity: .78;
}

.page-about .eco-text {
  max-width: 66ch;
  margin: clamp(24px, 4vw, 34px) 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--paper);
  opacity: .82;
}

/* ---------- 承诺与入口 ---------- */
.page-about .commit-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(26px, 4vw, 36px);
}

.page-about .commit-item {
  padding: 20px 20px 22px;
  border: 2px solid var(--line);
  border-left: 4px solid var(--sand);
  background: rgba(10, 42, 64, .45);
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .commit-item:hover {
  border-color: var(--line-cyan);
  transform: translateY(-3px);
}

.page-about .commit-item h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--paper);
}

.page-about .commit-item p {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--paper);
  opacity: .78;
}

.page-about .commit-item .btn {
  display: inline-block;
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stats li {
    padding-right: 18px;
    border-bottom: 1px solid var(--line);
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .75fr);
    align-items: end;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-timeline {
    padding-left: 40px;
  }

  .page-about .about-timeline::before {
    left: 11px;
  }

  .page-about .tl-entry {
    grid-template-columns: 104px minmax(0, 1fr) 216px;
    gap: clamp(16px, 2.6vw, 30px);
    align-items: start;
  }

  .page-about .tl-entry::before {
    left: -35px;
  }

  .page-about .tl-entry:not(:has(.tl-aside)) .tl-body {
    grid-column: span 1;
  }

  .page-about .tl-aside {
    align-self: start;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, .75fr);
    align-items: start;
  }

  .page-about .team-row {
    grid-template-columns: 62px 200px minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .team-row__no {
    grid-row: auto;
  }

  .page-about .team-row__name,
  .page-about .team-row__desc {
    grid-column: auto;
  }

  .page-about .flow-side {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline-jump a,
  .page-about .team-row,
  .page-about .commit-item,
  .page-about .flow-step {
    transition: none;
  }

  .page-about .timeline-jump a:hover,
  .page-about .commit-item:hover {
    transform: none;
  }
}