.page-about {
  --about-pad: clamp(2.75rem, 7vw, 5.5rem);
  --about-rule: rgba(23, 28, 26, 0.13);
  --about-rule-soft: rgba(23, 28, 26, 0.08);
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about .prose p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.01em;
}

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

.page-about .text-link {
  color: var(--ink-mid);
  text-decoration: none;
  border-bottom: 1px solid var(--amber);
  padding-bottom: 1px;
  font-size: 14px;
  letter-spacing: 0.02em;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  color: var(--cinnabar);
  border-color: var(--cinnabar);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(1rem, 2.5vw, 1.6rem);
  padding-bottom: 0.4rem;
}

/* ---------- 首屏封面 ---------- */
.page-about .about-cover {
  position: relative;
  padding-block: clamp(1.6rem, 4vw, 3rem) var(--about-pad);
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(245, 198, 109, 0.16), transparent 58%),
    linear-gradient(168deg, var(--ink-deep) 0%, var(--ink-mid) 64%, var(--ink-deep) 100%);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -34%;
  width: 62%;
  height: 78%;
  background: linear-gradient(120deg, rgba(178, 85, 63, 0.28), transparent 68%);
  transform: rotate(-14deg);
  pointer-events: none;
}

.page-about .cover-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .cover-rail .coord {
  margin: 0 0 0.85rem;
  color: var(--stone);
  letter-spacing: 0.14em;
  font-size: 11px;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.15rem 1rem;
  border-top: 1px solid var(--hair);
}

.page-about .rail-link {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--hair);
  color: rgba(244, 235, 221, 0.78);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.04em;
  transition: color 0.2s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--amber-bright);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  color: var(--amber);
  letter-spacing: 0.06em;
}

.page-about .cover-main .kicker {
  margin: 0 0 0.9rem;
  color: var(--amber);
  letter-spacing: 0.16em;
  font-size: 11px;
}

.page-about .cover-main h1 {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 7.2vw, 3.8rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: 0.045em;
  color: var(--cream);
  text-wrap: balance;
}

.page-about .cover-lede {
  margin: 0 0 1.6rem;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.9;
  letter-spacing: 0.01em;
  color: rgba(244, 235, 221, 0.84);
}

.page-about .cover-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 0.6rem;
  border-top: 1px solid var(--hair);
  padding-top: 1.1rem;
}

.page-about .cover-facts li {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .fact-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.25rem, 3.4vw, 1.6rem);
  color: var(--amber-bright);
  letter-spacing: 0.02em;
}

.page-about .fact-label {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

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

.page-about .cover-frame {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
  overflow: hidden;
  background: var(--ink-mid);
  aspect-ratio: 14 / 9;
}

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

.page-about .cover-figure .media-caption {
  margin-top: 0.7rem;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--stone);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding-block: var(--about-pad);
}

.page-about .about-section .section-title {
  margin: 0.35rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.6vw, 2.35rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.035em;
  color: var(--ink-deep);
  text-wrap: balance;
}

.page-about .about-section .kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cinnabar);
  font-family: var(--font-mono);
  font-weight: 600;
}

.page-about .section-note {
  margin: 0.7rem 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--stone);
  max-width: 52ch;
}

.page-about .section-head {
  margin-bottom: clamp(1.5rem, 4vw, 2.4rem);
}

/* ---------- 01 缘起 ---------- */
.page-about .about-origin {
  background: var(--paper);
}

.page-about .origin-grid {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .origin-aside {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.page-about .origin-card {
  background: var(--mist);
  padding: 1.35rem 1.4rem 1.5rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .origin-card-label {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-mid);
}

.page-about .origin-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .origin-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink);
}

.page-about .origin-mark {
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: 0.45rem;
  background: var(--amber);
  transform: rotate(45deg);
}

.page-about .origin-foot {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 02 版本时间轴 ---------- */
.page-about .about-versions {
  background: linear-gradient(180deg, var(--paper) 0%, var(--mist) 100%);
}

.page-about .versions-head {
  margin-bottom: clamp(1.6rem, 4vw, 2.4rem);
}

.page-about .versions-grid {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 2.6rem);
}

.page-about .tl-rail .coord {
  margin: 0 0 0.8rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--stone);
}

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

.page-about .tl-rail-link {
  display: inline-block;
  padding: 0.4rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--ink-mid);
  background: rgba(28, 64, 69, 0.08);
  border-left: 2px solid var(--stone);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .tl-rail-link:hover,
.page-about .tl-rail-link:focus-visible {
  background: var(--ink-deep);
  color: var(--amber-bright);
  border-left-color: var(--amber);
}

.page-about .tl-rail-foot {
  margin: 0.9rem 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cinnabar);
}

.page-about .tl-list {
  position: relative;
  padding-left: 2.75rem;
}

.page-about .tl-list::before {
  content: "";
  position: absolute;
  top: 0.7rem;
  bottom: 0.7rem;
  left: 0.6rem;
  width: 2px;
  background: linear-gradient(180deg, var(--amber) 0%, rgba(110, 145, 140, 0.55) 100%);
}

.page-about .tl-item {
  position: relative;
  border-bottom: 1px solid var(--about-rule);
  padding-bottom: 1.05rem;
  margin-bottom: 1.05rem;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -2.4rem;
  top: 0.5rem;
  width: 10px;
  height: 10px;
  background: var(--amber);
  transform: rotate(45deg);
  transition: background 0.2s var(--ease);
}

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

.page-about .tl-summary {
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  cursor: pointer;
  padding: 0.1rem 0 0.2rem;
}

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

.page-about .tl-summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--stone);
  line-height: 1;
}

.page-about .tl-item[open] .tl-summary::after {
  content: "–";
  color: var(--cinnabar);
}

.page-about .tl-tag {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-deep);
  background: var(--amber);
  padding: 0.16rem 0.4rem;
  flex: none;
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-size: clamp(0.98rem, 2.8vw, 1.14rem);
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--ink-deep);
  line-height: 1.4;
}

.page-about .tl-body {
  padding-top: 0.6rem;
}

.page-about .tl-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(23, 28, 26, 0.78);
  max-width: 58ch;
}

/* ---------- 03 四条主线 ---------- */
.page-about .about-routes {
  background: var(--ink-deep);
  color: var(--paper);
}

.page-about .about-routes .section-title {
  color: var(--cream);
}

.page-about .about-routes .kicker {
  color: var(--amber);
}

.page-about .route-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.4rem;
  padding: 0.85rem 0;
  margin-bottom: clamp(1.2rem, 3vw, 1.8rem);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}

.page-about .route-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: rgba(244, 235, 221, 0.82);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .route-legend-item:hover,
.page-about .route-legend-item:focus-visible {
  color: var(--amber-bright);
}

.page-about .route-swatch {
  display: inline-block;
  width: 14px;
  height: 8px;
  transform: skewX(-14deg);
}

.page-about .route-swatch--calendar { background: var(--amber); }
.page-about .route-swatch--panel { background: var(--amber-bright); }
.page-about .route-swatch--watch { background: var(--stone); }
.page-about .route-swatch--preview { background: var(--cinnabar); }

.page-about .route-grid {
  display: grid;
  gap: 1rem;
}

.page-about .route-card {
  position: relative;
  padding: 1.4rem 1.35rem 1.5rem;
  background: rgba(244, 235, 221, 0.05);
  border-top: 3px solid var(--route-color, var(--amber));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: background 0.25s var(--ease);
}

.page-about .route-card:hover {
  background: rgba(244, 235, 221, 0.09);
}

.page-about .route-card--calendar { --route-color: var(--amber); }
.page-about .route-card--panel { --route-color: var(--amber-bright); }
.page-about .route-card--watch { --route-color: var(--stone); }
.page-about .route-card--preview { --route-color: var(--cinnabar); }

.page-about .route-num {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--route-color, var(--amber));
}

.page-about .route-title {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cream);
}

.page-about .route-text {
  margin: 0 0 0.9rem;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 235, 221, 0.76);
}

.page-about .route-card .text-link {
  color: var(--amber-bright);
  border-bottom-color: rgba(245, 198, 109, 0.45);
  font-size: 13px;
}

.page-about .route-card .text-link:hover,
.page-about .route-card .text-link:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--cream);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  background: var(--paper);
}

.page-about .team-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.8rem);
}

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

.page-about .team-frame {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  overflow: hidden;
  background: var(--mist);
  aspect-ratio: 4 / 3;
}

.page-about .team-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

.page-about .team-figure .media-caption {
  margin-top: 0.7rem;
  font-size: 12px;
  line-height: 1.7;
  color: var(--stone);
  letter-spacing: 0.03em;
}

.page-about .team-lede {
  margin: 0.9rem 0 1.5rem;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(23, 28, 26, 0.78);
  max-width: 50ch;
}

.page-about .role-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.page-about .role-item {
  padding: 1rem 1.15rem 1.1rem;
  background: var(--ink-deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .role-name {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .role-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(244, 235, 221, 0.76);
}

/* ---------- 05 合作与认可 ---------- */
.page-about .about-partners {
  background: linear-gradient(180deg, var(--mist) 0%, var(--paper) 100%);
}

.page-about .partners-grid {
  display: grid;
  gap: 1rem;
}

.page-about .stat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .stat {
  background: var(--cream);
  padding: 1.15rem 1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.35rem, 4vw, 1.75rem);
  letter-spacing: 0.01em;
  color: var(--ink-deep);
}

.page-about .stat-label {
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--stone);
}

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

.page-about .partner-frame {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  overflow: hidden;
  background: var(--ink-mid);
  aspect-ratio: 3 / 2;
}

.page-about .partner-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

.page-about .partner-figure .media-caption {
  margin-top: 0.7rem;
  font-size: 12px;
  line-height: 1.7;
  color: var(--stone);
  letter-spacing: 0.03em;
}

.page-about .partner-note {
  padding: 1.5rem 1.4rem 1.6rem;
  color: var(--paper);
}

.page-about .partner-note-label {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .partner-note-title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 3vw, 1.2rem);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: 0.03em;
  color: var(--cream);
}

.page-about .partner-note-text {
  margin: 0 0 1.1rem;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(244, 235, 221, 0.78);
}

.page-about .partner-btn {
  font-size: 13px;
}

/* ---------- 06 服务与联系 ---------- */
.page-about .about-scope {
  background: var(--paper);
  border-top: 1px solid var(--about-rule-soft);
}

.page-about .scope-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.6rem);
}

.page-about .scope-copy .prose {
  margin-top: 1rem;
}

.page-about .contact-list {
  margin: 1.5rem 0 1.4rem;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .contact-row {
  display: grid;
  gap: 0.2rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .contact-row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--stone);
}

.page-about .contact-row dd {
  margin: 0;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--ink-deep);
  word-break: break-word;
}

.page-about .scope-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .scope-card {
  padding: 1.4rem 1.3rem 1.3rem;
  align-self: start;
}

.page-about .scope-card-label {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-mid);
}

.page-about .scope-info {
  list-style: none;
  margin: 0 0 1.2rem;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .scope-info li {
  display: grid;
  gap: 0.15rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px dashed rgba(28, 64, 69, 0.22);
}

.page-about .scope-info li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .scope-key {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(28, 64, 69, 0.62);
}

.page-about .scope-val {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-deep);
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.02em;
  word-break: break-word;
}

.page-about .to-top {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--ink-mid);
  text-decoration: none;
  border-bottom: 1px solid var(--amber);
  padding-bottom: 2px;
}

.page-about .to-top:hover,
.page-about .to-top:focus-visible {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .cover-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .origin-head {
    grid-column: 1 / -1;
  }

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

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

  .page-about .stat-block {
    grid-column: 1 / -1;
  }

  .page-about .partner-note {
    grid-column: 1 / -1;
  }

  .page-about .contact-row {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    align-items: baseline;
    gap: 1rem;
  }
}

@media (min-width: 960px) {
  .page-about .cover-grid {
    grid-template-columns: 176px minmax(0, 1fr) minmax(0, 372px);
    align-items: start;
  }

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

  .page-about .versions-grid {
    grid-template-columns: 186px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .tl-rail {
    position: sticky;
    top: calc(var(--header-h-tight) + 1.2rem);
  }

  .page-about .tl-rail-list {
    flex-direction: column;
    flex-wrap: nowrap;
  }

  .page-about .tl-rail-link {
    display: block;
    width: 100%;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
    align-items: start;
  }

  .page-about .team-figure {
    position: sticky;
    top: calc(var(--header-h-tight) + 1.2rem);
  }

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

  .page-about .partners-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    grid-template-rows: auto auto;
  }

  .page-about .stat-block {
    grid-column: 1;
  }

  .page-about .partner-figure {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .partner-note {
    grid-column: 1 / -1;
  }

  .page-about .scope-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.7fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
<<<END>>>