.page-about {
  --about-cut: 20px;
  --about-cut-lg: 32px;
  background: var(--paper-50);
  color: var(--ink-900);
}

.page-about .about-crumb {
  padding-top: clamp(14px, 3vw, 24px);
  padding-bottom: clamp(8px, 2vw, 16px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(28px, 5vw, 64px) 0 clamp(44px, 7vw, 92px);
  background:
    radial-gradient(120% 140% at 88% -20%, rgba(246, 196, 69, 0.2), transparent 58%),
    radial-gradient(90% 120% at -10% 110%, rgba(69, 214, 176, 0.14), transparent 60%),
    var(--navy-950);
  color: var(--white);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  left: 42%;
  right: -22%;
  bottom: -34%;
  height: 72%;
  transform: rotate(-9deg);
  background: linear-gradient(115deg, rgba(246, 196, 69, 0.18), rgba(23, 76, 116, 0.06) 58%, transparent);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-hero-copy h1 {
  margin: 12px 0 0;
  font-size: clamp(32px, 6.4vw, 62px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  font-weight: 800;
  max-width: 14em;
}

.page-about .about-hero .lede {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 34em;
  color: rgba(245, 248, 251, 0.82);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.75;
}

.page-about .about-jump {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-top: 1px solid rgba(245, 248, 251, 0.16);
}

.page-about .about-jump a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 4px;
  border-bottom: 1px solid rgba(245, 248, 251, 0.1);
  color: var(--white);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  transition: color 160ms ease, padding-left 160ms ease, border-color 160ms ease;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--gold-500);
  padding-left: 14px;
  border-bottom-color: rgba(246, 196, 69, 0.6);
}

.page-about .about-jump .mono {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold-500);
}

.page-about .about-hero-facts {
  display: grid;
  gap: 14px;
  padding: clamp(20px, 3vw, 30px);
  background: rgba(10, 44, 70, 0.7);
  border: 1px solid rgba(245, 248, 251, 0.16);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut-lg)), calc(100% - var(--about-cut-lg)) 100%, 0 100%);
}

.page-about .about-fact {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(245, 248, 251, 0.12);
}

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

.page-about .about-fact .stat-value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1.1;
  font-weight: 700;
  color: var(--gold-500);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact .stat-label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(245, 248, 251, 0.7);
}

/* ---------- 通用小节 ---------- */
.page-about .about-story,
.page-about .about-team,
.page-about .about-rhythm,
.page-about .about-next {
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-story-body > p:not(.eyebrow),
.page-about .about-team-body > p:not(.eyebrow),
.page-about .about-rhythm-head > p:not(.eyebrow),
.page-about .about-partners-body > p:not(.eyebrow),
.page-about .about-values-head > p:not(.eyebrow) {
  margin: 14px 0 0;
  max-width: 46em;
  color: var(--slate-500);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-values .about-values-head > p:not(.eyebrow),
.page-about .about-partners .about-partners-body > p:not(.eyebrow) {
  color: rgba(245, 248, 251, 0.76);
}

.page-about .about-figcap {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate-500);
}

.page-about .theme-dark .about-figcap {
  color: rgba(245, 248, 251, 0.6);
}

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

.page-about .about-story-figure img,
.page-about .about-team-figure img,
.page-about .about-partners-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  background: var(--navy-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

/* ---------- 品牌历程 ---------- */
.page-about .about-story-grid {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
}

.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold-500), rgba(69, 214, 176, 0.65) 55%, rgba(23, 76, 116, 0.18));
}

.page-about .about-timeline > li {
  position: relative;
  padding-left: 32px;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gold-500);
  box-shadow: 0 0 0 4px rgba(246, 196, 69, 0.18);
}

.page-about .about-timeline > li.is-mint::before {
  background: var(--mint-400);
  box-shadow: 0 0 0 4px rgba(69, 214, 176, 0.18);
}

.page-about .about-node-year {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--indigo-600);
}

.page-about .about-timeline .title-md {
  margin: 6px 0 0;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.35;
}

.page-about .about-timeline li > p:not(.about-node-year) {
  margin: 8px 0 0;
  color: var(--slate-500);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 折叠 ---------- */
.page-about details > summary {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding-bottom: 2px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--indigo-600);
  border-bottom: 1px dashed rgba(23, 76, 116, 0.45);
  list-style: none;
}

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

.page-about details > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 14px;
}

.page-about details[open] > summary::after {
  content: "–";
}

.page-about details > summary:hover,
.page-about details > summary:focus-visible {
  color: var(--gold-500);
  border-bottom-color: var(--gold-500);
}

.page-about .about-more p {
  margin: 10px 0 0;
  padding-left: 12px;
  border-left: 2px solid rgba(23, 76, 116, 0.22);
  color: var(--slate-500);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .theme-dark details > summary {
  color: var(--gold-300);
  border-bottom-color: rgba(255, 230, 163, 0.45);
}

/* ---------- 价值坐标 ---------- */
.page-about .about-values {
  padding: clamp(48px, 7vw, 96px) 0;
  background:
    repeating-linear-gradient(90deg, rgba(245, 248, 251, 0.045) 0 1px, transparent 1px 72px),
    radial-gradient(80% 120% at 90% 0%, rgba(246, 196, 69, 0.14), transparent 60%),
    var(--navy-950);
  color: var(--white);
}

.page-about .about-values-head .lede {
  max-width: 40em;
  color: rgba(245, 248, 251, 0.78);
}

.page-about .about-legend {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
}

.page-about .about-legend > li {
  display: grid;
  gap: 10px;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-top: 1px solid rgba(245, 248, 251, 0.16);
}

.page-about .about-legend > li:last-child {
  border-bottom: 1px solid rgba(245, 248, 251, 0.16);
}

.page-about .about-legend-key {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: rgba(245, 248, 251, 0.72);
}

.page-about .about-swatch {
  width: 14px;
  height: 14px;
  flex: none;
  clip-path: polygon(0 0, 100% 0, 100% 60%, 60% 100%, 0 100%);
  background: var(--gold-500);
}

.page-about .about-legend > li.is-mint .about-swatch {
  background: var(--mint-400);
}

.page-about .about-legend > li.is-indigo .about-swatch {
  background: var(--indigo-600);
  box-shadow: inset 0 0 0 1px rgba(245, 248, 251, 0.5);
}

.page-about .about-legend-body .title-md {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.3;
}

.page-about .about-legend-body p {
  margin: 8px 0 0;
  max-width: 44em;
  color: rgba(245, 248, 251, 0.76);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
}

.page-about .about-roles {
  margin: clamp(22px, 3vw, 32px) 0 0;
  display: grid;
}

.page-about .about-role {
  padding: 16px 0;
  border-top: 1px dashed rgba(17, 24, 32, 0.16);
}

.page-about .about-role dt {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -0.01em;
}

.page-about .about-role dt .mono {
  color: var(--indigo-600);
  font-size: 20px;
  font-weight: 700;
}

.page-about .about-role dd {
  margin: 6px 0 0;
  color: var(--slate-500);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 合作与资质 ---------- */
.page-about .about-partners {
  padding: clamp(48px, 7vw, 96px) 0;
  background:
    radial-gradient(70% 110% at 12% 100%, rgba(69, 214, 176, 0.16), transparent 62%),
    var(--navy-950);
  color: var(--white);
}

.page-about .about-partners-grid {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
}

.page-about .about-proof {
  list-style: none;
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.page-about .about-proof li {
  display: grid;
  gap: 4px;
  padding-top: 14px;
  border-top: 2px solid rgba(246, 196, 69, 0.55);
}

.page-about .about-proof li:first-child {
  border-top-color: var(--gold-500);
}

.page-about .about-proof .stat-value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.1;
  font-weight: 700;
  color: var(--gold-500);
  font-variant-numeric: tabular-nums;
}

.page-about .about-proof li:first-child .stat-value {
  font-size: clamp(38px, 6vw, 56px);
  color: var(--gold-300);
}

.page-about .about-proof .stat-label {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(245, 248, 251, 0.7);
}

.page-about .about-cert {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-cert li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 248, 251, 0.8);
}

.page-about .about-cert li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--mint-400);
  clip-path: polygon(0 0, 100% 0, 100% 60%, 60% 100%, 0 100%);
}

/* ---------- 年度节奏 ---------- */
.page-about .about-rhythm {
  background: var(--white);
}

.page-about .about-rhythm-list {
  margin: clamp(24px, 3.6vw, 38px) 0 0;
  display: grid;
  gap: 14px;
}

.page-about .about-rhythm-item {
  border: 1px solid rgba(17, 24, 32, 0.12);
  border-left: 3px solid var(--gold-500);
  padding: 16px clamp(16px, 2.4vw, 24px);
  background: var(--paper-50);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: border-color 160ms ease, background-color 160ms ease;
}

.page-about .about-rhythm-item:hover {
  border-left-color: var(--mint-400);
  background: var(--white);
}

.page-about .about-rhythm-item > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 16px;
  width: 100%;
  margin-top: 0;
  padding-bottom: 0;
  font-size: 16px;
  font-weight: 800;
  color: var(--ink-900);
  border-bottom: 0;
}

.page-about .about-rhythm-item > summary .mono {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--indigo-600);
}

.page-about .about-rhythm-item > summary::after {
  color: var(--gold-500);
  font-size: 16px;
}

.page-about .about-rhythm-item p {
  margin: 12px 0 0;
  max-width: 52em;
  color: var(--slate-500);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-top: 0;
}

.page-about .about-next-panel {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(24px, 4vw, 48px);
  background: linear-gradient(115deg, var(--gold-500), var(--gold-300) 78%);
  color: var(--navy-950);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut-lg)), calc(100% - var(--about-cut-lg)) 100%, 0 100%);
}

.page-about .about-next-copy .title-md {
  margin: 0;
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.page-about .about-next-copy p {
  margin: 10px 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(4, 23, 35, 0.78);
}

.page-about .about-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-next-link {
  display: inline-flex;
  align-items: center;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  color: var(--navy-950);
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(4, 23, 35, 0.3);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

.page-about .about-next-link.is-primary {
  background: var(--navy-950);
  color: var(--gold-300);
  border-color: var(--navy-950);
}

.page-about .about-next-link:hover,
.page-about .about-next-link:focus-visible {
  background: var(--white);
  color: var(--navy-950);
  border-color: var(--navy-950);
}

.page-about .about-next-link.is-primary:hover,
.page-about .about-next-link.is-primary:focus-visible {
  background: var(--coral-500);
  color: var(--white);
  border-color: var(--coral-500);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-legend > li {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 4px 28px;
    align-items: start;
  }

  .page-about .about-legend-key {
    padding-top: 5px;
  }

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

  .page-about .about-next-panel {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-next-links {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-jump {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0 18px;
    border-top: 0;
  }

  .page-about .about-jump a {
    flex-direction: column;
    gap: 6px;
    padding: 14px 0 12px;
    border-top: 1px solid rgba(245, 248, 251, 0.24);
    border-bottom: 0;
  }

  .page-about .about-jump a:hover,
  .page-about .about-jump a:focus-visible {
    padding-left: 0;
    border-top-color: var(--gold-500);
    border-bottom-color: transparent;
  }

  .page-about .about-story-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-story-figure {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-team-grid,
  .page-about .about-partners-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: center;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump a,
  .page-about .about-rhythm-item,
  .page-about .about-next-link {
    transition: none;
  }

  .page-about .about-story-figure {
    position: static;
  }
}