.page-about {
  --about-pad: clamp(28px, 5vw, 64px);
  --about-gap: clamp(16px, 2.4vw, 28px);
}

.page-about .section {
  padding: clamp(36px, 6vw, 84px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 18px 0 0;
  list-style: none;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .crumb-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.page-about .crumb-link {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--t);
}

.page-about .crumb-link:hover,
.page-about .crumb-link:focus-visible {
  color: var(--orange);
}

.page-about .crumb-sep {
  color: var(--line);
}

.page-about .crumb-current {
  color: var(--bone);
}

/* ---------- HERO ---------- */
.page-about .about-hero {
  border-bottom: 1px solid var(--line);
  background:
    repeating-linear-gradient(90deg, transparent 0 79px, rgba(42, 74, 62, 0.28) 79px 80px),
    linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 100%);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-hero-main .h-display {
  margin: 10px 0 18px;
  line-height: 0.98;
}

.page-about .about-hero-main .lede {
  max-width: 62ch;
  color: var(--bone-dim);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 4vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-facts .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--ink-2);
}

.page-about .stat-val {
  font-family: var(--ff-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1;
  color: var(--white);
}

.page-about .stat-lab {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-hero-side {
  border: 1px solid var(--line);
  border-top: 2px solid var(--orange);
  background: var(--ink-3);
  padding: 20px 18px 18px;
}

.page-about .side-title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--mist);
}

.page-about .side-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .side-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--line-soft);
  color: var(--bone);
  text-decoration: none;
  transition: color var(--t), padding-left var(--t);
}

.page-about .side-link:hover,
.page-about .side-link:focus-visible {
  color: var(--orange);
  padding-left: 6px;
}

.page-about .side-num {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .side-txt {
  font-size: 14px;
  line-height: 1.6;
}

.page-about .side-foot {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 12px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 通用区块头 ---------- */
.page-about .section-head {
  max-width: 76ch;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .section-head .h-section {
  margin: 8px 0 12px;
}

.page-about .about-intro {
  margin: 0;
  color: var(--bone-dim);
  font-size: 16px;
  line-height: 1.85;
}

/* ---------- 图片 ---------- */
.page-about .about-figure,
.page-about .about-collab-figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .media-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.9) contrast(1.05);
}

.page-about .media-cap {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  padding-left: 26px;
  border-left: 1px solid var(--line);
}

.page-about .tl-item {
  position: relative;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 18px;
  width: 9px;
  height: 9px;
  background: var(--line);
  transition: background var(--t), box-shadow var(--t);
}

.page-about .tl-item[open]::before {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 90, 31, 0.16);
}

.page-about .tl-summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  transition: color var(--t);
}

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

.page-about .tl-summary:hover,
.page-about .tl-summary:focus-visible {
  color: var(--orange);
}

.page-about .tl-year {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .tl-title {
  flex: 1 1 auto;
  font-size: clamp(1rem, 2vw, 1.18rem);
  font-weight: 500;
  color: inherit;
}

.page-about .tl-mark {
  flex: 0 0 auto;
  width: 18px;
  height: 1px;
  background: var(--orange);
  position: relative;
  top: -4px;
}

.page-about .tl-item[open] .tl-mark {
  background: var(--blue);
}

.page-about .tl-body {
  padding: 0 0 20px;
  max-width: 70ch;
}

.page-about .tl-body p {
  margin: 0 0 10px;
  color: var(--bone-dim);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .tl-meta {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* ---------- 内容体系 ---------- */
.page-about .csys {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .csys-item {
  padding: 20px 18px 22px;
  background: var(--ink-2);
  border-left: 2px solid transparent;
  transition: border-color var(--t), background var(--t);
}

.page-about .csys-item:hover,
.page-about .csys-item:focus-within {
  background: var(--panel);
  border-left-color: var(--blue);
}

.page-about .csys-num {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .csys-title {
  margin: 0 0 8px;
  font-size: clamp(1.05rem, 2vw, 1.22rem);
  font-weight: 500;
  color: var(--bone);
}

.page-about .csys-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 32px);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .tcard {
  padding: 18px 16px;
  background: var(--ink-3);
  outline: none;
  transition: background var(--t), box-shadow var(--t);
}

.page-about .tcard:hover,
.page-about .tcard:focus-visible {
  background: var(--panel);
  box-shadow: inset 2px 0 0 var(--orange);
}

.page-about .tcard-num {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .tcard-role {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--bone);
}

.page-about .tcard-brief {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--bone-dim);
}

.page-about .tcard-more {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 12px;
  line-height: 1.75;
  color: var(--mist);
  opacity: 0.6;
  transition: opacity var(--t);
}

.page-about .tcard:hover .tcard-more,
.page-about .tcard:focus-visible .tcard-more {
  opacity: 1;
  color: var(--bone-dim);
}

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

/* ---------- 更新节奏 ---------- */
.page-about .cadence {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .cadence-step {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 20px 18px;
  background: var(--ink-2);
}

.page-about .cadence-time {
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .cadence-step--signal {
  background: var(--panel);
  border-left: 2px solid var(--orange);
}

.page-about .cadence-step--signal .cadence-time {
  color: var(--orange);
}

.page-about .cadence-title {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--bone);
}

.page-about .cadence-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 合作 ---------- */
.page-about .collab-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .collab-item {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 14px;
  border: 1px solid var(--line);
  background:
    repeating-linear-gradient(0deg, transparent 0 23px, rgba(42, 74, 62, 0.25) 23px 24px),
    var(--ink-3);
  outline: none;
  transition: border-color var(--t), background var(--t);
}

.page-about .collab-item:hover,
.page-about .collab-item:focus-visible {
  border-color: var(--orange);
  background: var(--ink-2);
}

.page-about .collab-badge {
  flex: 0 0 auto;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--mist);
  transition: border-color var(--t), color var(--t);
}

.page-about .collab-item:hover .collab-badge,
.page-about .collab-item:focus-visible .collab-badge {
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .collab-title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--bone);
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .collab-count {
  font-size: 13px;
  color: var(--orange);
}

.page-about .collab-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
  opacity: 0.72;
  transition: opacity var(--t), color var(--t);
}

.page-about .collab-item:hover .collab-note,
.page-about .collab-item:focus-visible .collab-note {
  opacity: 1;
  color: var(--bone-dim);
}

.page-about .collab-cta {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--bone-dim);
}

.page-about .link-signal {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid var(--orange);
}

.page-about .link-signal:hover,
.page-about .link-signal:focus-visible {
  color: var(--orange-soft);
}

/* ---------- 归档 ---------- */
.page-about .archive-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .acard {
  padding: 18px 16px;
  background: var(--ink-2);
  transition: background var(--t);
}

.page-about .acard:hover {
  background: var(--panel);
}

.page-about .acard-year {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--blue);
}

.page-about .acard-title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--bone);
}

.page-about .acard-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .archive-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 32px;
  margin-top: clamp(20px, 3vw, 30px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .archive-line {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .archive-line .mono {
  color: var(--white);
  font-weight: 700;
  margin-right: 6px;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border-bottom: 0;
  background:
    linear-gradient(90deg, rgba(255, 90, 31, 0.12) 0%, transparent 55%),
    var(--ink-3);
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: center;
}

.page-about .about-cta-text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--mist);
  max-width: 62ch;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .csys,
  .page-about .team-grid,
  .page-about .collab-grid,
  .page-about .archive-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .cadence-step {
    grid-template-columns: 120px 1fr;
    gap: 18px;
    align-items: start;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

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

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

  .page-about .archive-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

  .page-about .timeline {
    padding-left: 34px;
  }

  .page-about .tl-item::before {
    left: -39px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr);
    gap: 48px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .side-link,
  .page-about .tl-item::before,
  .page-about .tcard,
  .page-about .tcard-more,
  .page-about .collab-item,
  .page-about .collab-note,
  .page-about .collab-badge,
  .page-about .csys-item,
  .page-about .acard {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>
<<<END>>>