.page-about {
  --about-rail: 92px;
  --about-card: rgba(255, 255, 255, 0.72);
  background: var(--bone);
  color: var(--stone);
  overflow-x: hidden;
}

.page-about .about-crumb-wrap {
  padding-top: clamp(96px, 13vw, 138px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(8px, 2vw, 20px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
  align-items: end;
}

.page-about .about-kicker {
  display: inline-block;
  font-size: var(--fs-12);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--clay);
  border-bottom: 2px solid rgba(181, 106, 75, 0.35);
  padding-bottom: 6px;
}

.page-about .about-title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 6.4vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-intro {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--ink-80);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 34px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--mist);
}

.page-about .about-hero-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-stat-num {
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  font-weight: 700;
  color: var(--pitch);
  letter-spacing: -0.01em;
}

.page-about .about-stat-cap {
  font-size: var(--fs-14);
  line-height: 1.6;
  color: var(--stone-78);
}

.page-about .about-hero-media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.page-about .about-hero-media .media-caption {
  padding: 12px 16px 14px;
  font-size: var(--fs-14);
  color: var(--stone-78);
}

.page-about .about-hero-band {
  height: clamp(54px, 9vw, 104px);
  margin-top: clamp(30px, 5vw, 54px);
  background: linear-gradient(100deg, var(--moss) 0%, var(--clay) 48%, var(--ink-deep) 100%);
  clip-path: polygon(0 38%, 100% 0, 100% 100%, 0 70%);
}

/* ---------- 章节索引 ---------- */
.page-about .about-toc {
  background: var(--bone);
  padding: 6px 0 clamp(18px, 3vw, 30px);
}

.page-about .about-toc-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
}

.page-about .about-toc-label {
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--moss);
}

.page-about .about-toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc-link {
  display: inline-block;
  padding: 6px 14px;
  border-radius: var(--pill);
  border: 1px solid var(--mist);
  background: #fff;
  font-size: var(--fs-14);
  color: var(--stone-78);
  text-decoration: none;
  transition: border-color 0.25s ease, color 0.25s ease, background 0.25s ease;
}

.page-about .about-toc-link:hover,
.page-about .about-toc-link:focus-visible {
  border-color: var(--pitch);
  color: var(--pitch-deep);
}

.page-about .about-toc-link[aria-current="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bone);
}

.page-about .about-toc-status {
  margin-left: auto;
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--clay);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter-grid {
  display: grid;
  gap: 14px;
}

.page-about .about-chapter-rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-num {
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--moss);
  transition: color 0.3s ease;
}

.page-about .about-num--clay {
  color: var(--clay);
}

.page-about .about-rail-line {
  flex: 1 1 auto;
  height: 2px;
  border-radius: var(--pill);
  background: var(--mist);
  transition: background 0.35s ease;
}

.page-about .about-chapter.is-active .about-num {
  color: var(--pitch);
}

.page-about .about-chapter.is-active .about-rail-line {
  background: linear-gradient(90deg, var(--pitch), var(--flux));
}

.page-about .about-h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.8vw, 2.5rem);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .about-lead {
  margin: 0 0 8px;
  max-width: 64ch;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--ink-80);
}

.page-about .about-p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--stone-78);
}

.page-about .about-p + .about-p {
  margin-top: 14px;
}

.page-about .about-inline-link {
  color: var(--pitch-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-mist {
  background: linear-gradient(180deg, rgba(217, 222, 214, 0.55), rgba(244, 241, 232, 0.9));
}

/* ---------- 起点原则 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-principle {
  padding: 22px;
  border: 1px solid var(--mist);
  border-radius: var(--radius-md);
  background: var(--about-card);
  border-left: 4px solid var(--moss);
  transition: transform 0.3s ease, border-left-color 0.3s ease;
}

.page-about .about-principle:hover {
  transform: translateY(-4px);
  border-left-color: var(--pitch);
}

.page-about .about-principle-title {
  margin: 0 0 10px;
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--ink);
}

/* ---------- 资料跑道 ---------- */
.page-about .about-runway {
  display: grid;
  gap: 16px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-run-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-run-label {
  font-size: var(--fs-14);
  color: var(--stone-78);
}

.page-about .about-run-value {
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-run-bar {
  display: block;
  position: relative;
  height: 8px;
  margin-top: 8px;
  border-radius: var(--pill);
  background: rgba(47, 52, 55, 0.16);
  overflow: hidden;
}

.page-about .about-run-fill {
  display: block;
  height: 100%;
  width: 70%;
  border-radius: var(--pill);
  background: linear-gradient(90deg, var(--pitch), var(--flux));
  box-shadow: inset 0 0 0 1px rgba(183, 243, 74, 0.55);
}

.page-about .about-runway > .about-run:nth-child(1) .about-run-fill { width: 96%; }
.page-about .about-runway > .about-run:nth-child(2) .about-run-fill { width: 82%; }
.page-about .about-runway > .about-run:nth-child(3) .about-run-fill { width: 68%; }
.page-about .about-runway > .about-run:nth-child(4) .about-run-fill { width: 54%; }

/* ---------- 档案展开 ---------- */
.page-about .about-archive-split {
  display: grid;
  gap: 22px;
  margin-top: 30px;
}

.page-about .about-archive-media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--stone);
}

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

.page-about .about-archive-media .media-caption {
  padding: 12px 16px 14px;
  font-size: var(--fs-14);
  color: var(--bone-70);
}

.page-about .about-dossiers {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-dossier {
  padding: 2px 18px 6px;
  border: 1px solid var(--mist);
  border-radius: var(--radius-md);
  background: var(--about-card);
}

.page-about .about-dossier-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--ink);
}

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

.page-about .about-dossier-summary::after {
  content: "+";
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  line-height: 24px;
  text-align: center;
  border-radius: 50%;
  border: 1px solid var(--moss);
  color: var(--pitch-deep);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
}

.page-about .about-dossier[open] .about-dossier-summary::after {
  content: "−";
  background: var(--pitch);
  border-color: var(--pitch);
  color: var(--bone);
}

.page-about .about-dossier .about-p {
  padding-bottom: 14px;
  font-size: var(--fs-17);
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-team-card {
  padding: 22px;
  border-radius: var(--radius-md);
  background: var(--ink);
  color: var(--bone);
  border: 1px solid rgba(244, 241, 232, 0.12);
}

.page-about .about-team-num {
  display: block;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700;
  color: var(--flux);
  line-height: 1;
}

.page-about .about-team-role {
  margin: 12px 0 10px;
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-team-card .about-p {
  color: var(--bone-70);
  font-size: var(--fs-14);
}

.page-about .about-team-media {
  margin: 24px 0 20px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.page-about .about-team-media .media-caption {
  padding: 12px 2px 0;
  font-size: var(--fs-14);
  color: var(--stone-78);
}

/* ---------- 看台时间轴 ---------- */
.page-about .about-terrace-track {
  position: relative;
  margin: 30px 0 0;
  padding: 0 0 0 32px;
  list-style: none;
}

.page-about .about-terrace-track::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: var(--pill);
  background: linear-gradient(180deg, var(--moss), var(--clay) 55%, var(--ink));
}

.page-about .about-terrace-node {
  position: relative;
  padding-bottom: 24px;
}

.page-about .about-terrace-node:last-child {
  padding-bottom: 0;
}

.page-about .about-terrace-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bone);
  border: 3px solid var(--moss);
}

.page-about .about-terrace-node:nth-child(2)::before { border-color: var(--moss); }
.page-about .about-terrace-node:nth-child(3)::before { border-color: var(--clay); }
.page-about .about-terrace-node:nth-child(4)::before { border-color: var(--pitch); }

.page-about .about-terrace-era {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--pill);
  background: rgba(110, 139, 91, 0.16);
  color: var(--pitch-deep);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
}

.page-about .about-terrace-title {
  margin: 10px 0 8px;
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--ink);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-partner {
  padding: 22px;
  border-radius: var(--radius-md);
  background: var(--stone);
  color: var(--bone);
  border: 1px solid rgba(244, 241, 232, 0.08);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.page-about .about-partner:hover {
  transform: translateY(-4px);
  border-color: var(--flux);
}

.page-about .about-partner-num {
  display: block;
  font-size: clamp(1.9rem, 4.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-partner-title {
  margin: 10px 0 10px;
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-partner-text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--bone-70);
}

.page-about .about-honors {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 24px;
  margin-top: 28px;
}

.page-about .about-clock {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--mist);
}

.page-about .about-clock-item {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 14px 0 14px 18px;
  border-bottom: 1px dashed rgba(47, 52, 55, 0.14);
}

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

.page-about .about-clock-time {
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--pitch);
}

.page-about .about-clock-text {
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--stone-78);
}

.page-about .about-flow-notes {
  align-self: start;
}

/* ---------- 里程碑 ---------- */
.page-about .about-ink {
  background: var(--ink);
  color: var(--bone);
}

.page-about .about-ink .about-h2 {
  color: var(--bone);
}

.page-about .about-ink .about-num {
  color: var(--flux);
}

.page-about .about-chapter.about-ink.is-active .about-num {
  color: var(--flux);
}

.page-about .about-ink .about-rail-line {
  background: rgba(244, 241, 232, 0.2);
}

.page-about .about-chapter.about-ink.is-active .about-rail-line {
  background: linear-gradient(90deg, var(--flux), rgba(244, 241, 232, 0.25));
}

.page-about .about-milestones {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(244, 241, 232, 0.16);
}

.page-about .about-milestone {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(244, 241, 232, 0.16);
}

.page-about .about-milestone-year {
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--flux);
  letter-spacing: 0.04em;
}

.page-about .about-milestone-title {
  margin: 0 0 8px;
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-milestone-text {
  margin: 0;
  max-width: 60ch;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--bone-70);
}

/* ---------- 联络 ---------- */
.page-about .about-connect {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-connect-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--mist);
  background: var(--about-card);
}

.page-about .about-connect-label {
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--moss);
}

.page-about .about-connect-value {
  font-family: var(--font-mono);
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-connect-note {
  font-size: var(--fs-14);
  color: var(--stone-78);
}

.page-about .about-connect-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

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

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
  }

  .page-about .about-chapter-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-chapter-rail {
    position: sticky;
    top: 104px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about .about-rail-line {
    width: 2px;
    height: 54px;
    flex: 0 0 auto;
  }

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

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

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

  .page-about .about-flow {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .about-milestone {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }

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

@media (min-width: 1024px) {
  .page-about .about-hero-stats {
    gap: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-principle,
  .page-about .about-partner,
  .page-about .about-num,
  .page-about .about-rail-line,
  .page-about .about-toc-link {
    transition: none;
  }

  .page-about .about-principle:hover,
  .page-about .about-partner:hover {
    transform: none;
  }
}