.page-about {
  background: var(--night);
  color: var(--cream);
  overflow-x: hidden;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

/* ---------- 页首长卷 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.34;
  filter: saturate(0.7) contrast(1.1);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(110% 80% at 10% 0%, rgba(200, 255, 61, 0.14), transparent 60%),
    linear-gradient(180deg, rgba(11, 20, 16, 0.5) 0%, rgba(11, 20, 16, 0.9) 58%, var(--night) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  padding-top: 30px;
  padding-bottom: 44px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--sage);
}

.page-about .breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  opacity: 0.45;
}

.page-about .breadcrumb__item a {
  color: var(--ink-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb__item a:hover,
.page-about .breadcrumb__item a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

.page-about .hero-tag {
  display: inline-block;
  margin-top: 24px;
  padding: 5px 12px;
  border: 1px solid rgba(255, 212, 71, 0.42);
  border-radius: 999px;
  background: rgba(255, 212, 71, 0.08);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lamp);
}

.page-about .hero-title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-size: clamp(29px, 7.6vw, 62px);
  font-weight: 800;
  line-height: 1.12;
  color: var(--cream);
  text-wrap: balance;
}

.page-about .hero-lede {
  max-width: 60ch;
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 1px;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .hero-stats li {
  min-width: 0;
  padding: 14px 14px 16px;
  background: rgba(16, 29, 22, 0.88);
}

.page-about .hero-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.05;
  color: var(--lamp);
  font-variant-numeric: tabular-nums;
}

.page-about .hero-stats__cap {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--sage);
}

.page-about .chapter-nav {
  margin-top: 28px;
}

.page-about .chapter-nav ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .chapter-nav a {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: rgba(255, 255, 255, 0.02);
  font-size: 13px;
  line-height: 1.4;
  color: var(--ink-dim);
  text-decoration: none;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .chapter-nav a span {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--neon);
}

.page-about .chapter-nav a:hover,
.page-about .chapter-nav a:focus-visible {
  color: var(--cream);
  border-color: rgba(200, 255, 61, 0.5);
  background: rgba(200, 255, 61, 0.08);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  position: relative;
  padding: 46px 0 50px;
}

.page-about .chapter--night {
  background: var(--night);
}

.page-about .chapter--turf {
  background: var(--turf);
}

.page-about .chapter--paper {
  background: var(--cream);
  color: var(--umber);
  --line: rgba(26, 18, 14, 0.16);
  --line-strong: rgba(26, 18, 14, 0.3);
  --ink-dim: #575E54;
  --sage: #6F7568;
}

.page-about .chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 12px;
  padding-top: 16px;
  border-top: 2px solid var(--line-strong);
}

.page-about .chapter__idx {
  flex: none;
  display: inline-block;
  padding: 5px 9px;
  border-radius: 4px;
  background: var(--neon);
  color: var(--night);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.1em;
  transform: skewX(-8deg);
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 4.6vw, 36px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--cream);
}

.page-about .chapter--paper .chapter__title {
  color: var(--umber);
}

.page-about .chapter--paper .chapter__idx {
  background: var(--umber);
  color: var(--lamp);
}

.page-about .chapter__lede {
  max-width: 62ch;
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-dim);
}

.page-about .about-prose {
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

.page-about .about-prose p {
  margin: 0 0 14px;
}

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

.page-about .chapter--paper .chapter-nav a:focus-visible,
.page-about .chapter--paper a:focus-visible,
.page-about .chapter--paper summary:focus-visible {
  outline-color: #2F6B2A;
}

/* ---------- 01 起点 ---------- */
.page-about .origin-body {
  display: grid;
  gap: 26px;
  margin-top: 22px;
}

.page-about .origin-facts {
  padding: 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(200, 255, 61, 0.08), rgba(16, 29, 22, 0.55) 60%);
}

.page-about .origin-facts__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-about .fact-list {
  margin: 0;
}

.page-about .fact-list div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .fact-list div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .fact-list dt {
  margin: 0;
  font-size: 13px;
  color: var(--sage);
}

.page-about .fact-list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cream);
  text-align: right;
}

/* ---------- 02 原则 ---------- */
.page-about .principles {
  display: grid;
  gap: 10px;
  max-width: 820px;
  margin-top: 24px;
}

.page-about .principle {
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: rgba(11, 20, 16, 0.5);
  overflow: hidden;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .principle[open] {
  border-color: rgba(200, 255, 61, 0.42);
  background: rgba(11, 20, 16, 0.8);
}

.page-about .principle summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--cream);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
}

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

.page-about .principle summary::marker {
  content: "";
}

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

.page-about .principle__idx {
  flex: none;
  padding: 3px 7px;
  border-radius: 3px;
  background: var(--lamp);
  color: var(--night);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
}

.page-about .principle__sign {
  position: relative;
  width: 16px;
  height: 16px;
  flex: none;
  color: var(--neon);
}

.page-about .principle__sign::before,
.page-about .principle__sign::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.page-about .principle__sign::before {
  left: 0;
  right: 0;
  top: 7px;
  height: 2px;
}

.page-about .principle__sign::after {
  top: 0;
  bottom: 0;
  left: 7px;
  width: 2px;
}

.page-about .principle[open] .principle__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .principle__body {
  margin: 0;
  padding: 14px 16px 18px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-dim);
}

.page-about .principle__body p {
  margin: 0;
}

.page-about .pitch-divider {
  margin-top: 30px;
  color: rgba(200, 255, 61, 0.5);
}

.page-about .pitch-divider svg {
  display: block;
  width: 100%;
  height: 30px;
}

/* ---------- 03 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 26px;
  margin-top: 24px;
}

.page-about .team-figure {
  margin: 20px 0 0;
}

.page-about .team-figure img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  object-fit: cover;
}

.page-about .team-figure figcaption {
  margin-top: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--sage);
}

.page-about .squad {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  overflow: hidden;
  counter-reset: squad;
}

.page-about .squad li {
  counter-increment: squad;
  padding: 14px 16px;
  background: #FBF5E6;
}

.page-about .squad__name {
  display: flex;
  align-items: baseline;
  gap: 9px;
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--umber);
}

.page-about .squad__name::before {
  content: counter(squad, decimal-leading-zero);
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #2F6B2A;
}

.page-about .squad__desc {
  margin: 5px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* ---------- 04 里程碑 ---------- */
.page-about .milestones {
  position: relative;
  overflow: hidden;
}

.page-about .milestones__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .milestones__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
  filter: saturate(0.55);
}

.page-about .milestones__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--night) 0%, rgba(11, 20, 16, 0.82) 45%, var(--night) 100%);
}

.page-about .milestones__inner {
  position: relative;
  z-index: 1;
}

.page-about .timeline {
  display: grid;
  gap: 14px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline__item {
  padding: 14px 16px;
  border-left: 2px solid rgba(200, 255, 61, 0.5);
  background: linear-gradient(90deg, rgba(200, 255, 61, 0.08), transparent 72%);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lamp);
}

.page-about .timeline__title {
  margin: 6px 0 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--cream);
}

.page-about .timeline__desc {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--sage);
}

/* ---------- 05 协作 ---------- */
.page-about .partner-body {
  margin-top: 20px;
}

.page-about .partner-grid {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .partner {
  padding: 18px 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: linear-gradient(170deg, rgba(200, 255, 61, 0.09), rgba(11, 20, 16, 0.35));
}

.page-about .partner__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .partner__name {
  margin: 10px 0 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .partner__desc {
  margin: 7px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--sage);
}

.page-about .partner-note {
  margin-top: 20px;
  padding: 16px 18px;
  border-left: 3px solid var(--yellow);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(255, 212, 71, 0.07);
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-dim);
}

.page-about .partner-note p {
  margin: 0;
}

/* ---------- 06 场景 ---------- */
.page-about .scene-grid {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.page-about .scene {
  padding: 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.42);
}

.page-about .scene__title {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  color: var(--umber);
}

.page-about .scene__title::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #2F6B2A;
}

.page-about .scene__list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .scene__list li {
  padding-left: 14px;
  border-left: 1px solid rgba(26, 18, 14, 0.2);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-dim);
}

.page-about .scene__list strong {
  display: block;
  margin-bottom: 2px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--umber);
}

.page-about .scene-foot {
  max-width: 64ch;
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-dim);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  padding: 40px 0 46px;
  background: var(--umber);
  border-top: 1px solid rgba(244, 235, 211, 0.16);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 4.4vw, 32px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--cream);
}

.page-about .about-cta__text {
  max-width: 58ch;
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

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

.page-about .about-cta__actions .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__inner {
    padding-top: 42px;
    padding-bottom: 58px;
  }

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

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

  .page-about .chapter {
    padding: 62px 0 66px;
  }

  .page-about .scene-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }

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

@media (min-width: 880px) {
  .page-about .origin-body {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 36px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .timeline {
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
    gap: 0;
    margin-top: 34px;
    border-top: 2px solid rgba(200, 255, 61, 0.35);
  }

  .page-about .timeline__item {
    position: relative;
    padding: 22px 18px 0 0;
    border-left: 0;
    border-right: 1px solid var(--line);
    background: none;
  }

  .page-about .timeline__item:last-child {
    padding-right: 0;
    border-right: 0;
  }

  .page-about .timeline__item::before {
    content: "";
    position: absolute;
    top: -7px;
    left: 0;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--neon);
    box-shadow: 0 0 0 4px rgba(200, 255, 61, 0.14);
  }
}

@media (min-width: 1024px) {
  .page-about .chapter-nav ol {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .principle,
  .page-about .principle__sign::before,
  .page-about .principle__sign::after,
  .page-about .chapter-nav a {
    transition: none;
  }
}