.page-about {
  --about-sticky-top: 118px;
  background: var(--paper-50);
  color: var(--ink-text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--paper-text);
  padding: clamp(24px, 4vw, 40px) 0 clamp(72px, 9vw, 120px);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 44px));
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-dark) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-dark) 1px, transparent 1px);
  background-size: 80px 80px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -20%;
  right: -10%;
  width: min(560px, 64vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(240, 196, 98, 0.24), rgba(240, 196, 98, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: center;
}

.page-about .about-hero__crumb {
  margin-bottom: 20px;
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--paper-muted);
}

.page-about .about-hero__crumb a {
  color: var(--paper-muted);
  text-decoration: none;
}

.page-about .about-hero__crumb a:hover,
.page-about .about-hero__crumb a:focus-visible {
  color: var(--gold-300);
}

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

.page-about .about-hero__crumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--paper-faint);
}

.page-about .about-hero__crumb [aria-current="page"] {
  color: var(--gold-300);
}

.page-about .about-hero__title {
  margin: 8px 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-96);
  line-height: 0.96;
  letter-spacing: 0.02em;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--gold-300);
}

.page-about .about-hero__lede {
  max-width: 60ch;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--paper-muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__frame {
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line-dark);
  background: var(--ink-700);
}

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

.page-about .about-hero__figure .figure__caption {
  margin-top: 12px;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--paper-faint);
}

.page-about .about-hero__vnote {
  display: none;
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-hero__vnote {
    display: block;
    position: absolute;
    top: 140px;
    right: 14px;
    z-index: 1;
    writing-mode: vertical-rl;
    font-family: var(--font-serif);
    font-size: var(--fs-12);
    letter-spacing: 0.34em;
    color: var(--gold-300);
    opacity: 0.78;
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(36px, 5vw, 64px);
  padding-top: clamp(56px, 7vw, 104px);
  padding-bottom: clamp(64px, 8vw, 120px);
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
  }
}

.page-about .about-body__main {
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: var(--about-sticky-top);
  padding-bottom: clamp(48px, 6vw, 88px);
  border-bottom: 1px solid var(--line-light);
  margin-bottom: clamp(48px, 6vw, 88px);
}

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

.page-about .about-section__head {
  margin-bottom: 24px;
}

.page-about .about-section__head h2 {
  margin: 10px 0 0;
}

/* ---------- 引文与数字 ---------- */
.page-about .about-quote {
  margin: 32px 0;
  padding: clamp(20px, 3vw, 32px);
  background: var(--paper-200);
  border-left: 3px solid var(--gold-600);
}

.page-about .about-quote blockquote {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-size: var(--fs-32);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.05em;
}

.page-about .about-quote__foot {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  align-items: center;
  justify-content: space-between;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
}

.page-about .about-quote__copy {
  border: 1px solid var(--gold-600);
  background: transparent;
  color: var(--ink-text);
  font: inherit;
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background 0.2s var(--ease-out), color 0.2s var(--ease-out);
}

.page-about .about-quote__copy:hover,
.page-about .about-quote__copy:focus-visible {
  background: var(--gold-600);
  color: var(--paper-50);
}

.page-about .about-quote__copy.is-done {
  background: var(--green-500);
  border-color: var(--green-500);
  color: var(--paper-50);
}

.page-about .about-marker {
  display: grid;
  gap: 12px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--line-light);
}

.page-about .about-marker__num {
  font-family: var(--font-num);
  font-size: var(--fs-72);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--gold-600);
}

.page-about .about-marker__text {
  margin: 0;
  max-width: 46ch;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--ink-muted);
}

@media (min-width: 640px) {
  .page-about .about-marker {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 28px;
    align-items: center;
  }
}

/* ---------- 四簇卡片 ---------- */
.page-about .about-clusters {
  display: grid;
  gap: 26px 20px;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 32px;
}

@media (min-width: 700px) {
  .page-about .about-clusters {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .card.about-cluster {
  position: relative;
  padding: 30px 22px 22px;
  background: var(--paper-50);
  border: 1px solid var(--line-light);
  transition: transform 0.24s var(--ease-out), box-shadow 0.24s var(--ease-out);
}

.page-about .card.about-cluster:hover {
  transform: translateY(-4px);
  box-shadow: 0 0 0 1px rgba(192, 138, 46, 0.55), 0 14px 30px -20px rgba(11, 12, 14, 0.5);
}

.page-about .about-cluster .card__label {
  position: absolute;
  top: -12px;
  left: 18px;
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  padding: 4px 12px;
}

.page-about .about-cluster .card__title {
  margin: 6px 0 12px;
  font-family: var(--font-display);
  font-size: var(--fs-22);
  font-weight: 800;
  line-height: 1.35;
}

.page-about .about-cluster .card__body {
  margin: 0 0 16px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-muted);
}

.page-about .about-cluster .card__meta {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-light);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--gold-600);
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--gold-600), rgba(192, 138, 46, 0.12));
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-mile {
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-mile__sum {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-mile__sum::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 22px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--gold-600);
  background: var(--paper-50);
  transition: background 0.2s var(--ease-out);
}

.page-about .about-mile[open] > .about-mile__sum::before {
  background: var(--gold-600);
}

.page-about .about-mile__ver {
  font-family: var(--font-num);
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--gold-600);
  letter-spacing: 0.02em;
}

.page-about .about-mile__title {
  font-family: var(--font-display);
  font-size: var(--fs-17);
  font-weight: 800;
}

.page-about .about-mile__body {
  margin: 0 0 18px;
  padding-right: 8px;
  max-width: 62ch;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-muted);
}

.page-about .about-timeline__figure {
  margin: 36px 0 0;
}

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

.page-about .about-timeline__figure .figure__caption {
  margin-top: 12px;
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

/* ---------- 团队 ---------- */
.page-about .about-teamgrid {
  display: grid;
  gap: 28px;
  margin-top: 32px;
}

@media (min-width: 820px) {
  .page-about .about-teamgrid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

.page-about .about-teamgrid__figure {
  margin: 0;
}

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

.page-about .about-teamgrid__figure .figure__caption {
  margin-top: 12px;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--ink-faint);
}

.page-about .about-teams {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-team {
  padding-left: 16px;
  border-left: 2px solid var(--paper-200);
  transition: border-color 0.24s var(--ease-out);
}

.page-about .about-team:hover {
  border-color: var(--gold-600);
}

.page-about .about-team__idx {
  display: inline-block;
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--blue-500);
  margin-bottom: 6px;
}

.page-about .about-team__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-17);
  font-weight: 800;
}

.page-about .about-team p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-muted);
}

/* ---------- 承诺 ---------- */
.page-about .about-pledges {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  counter-reset: pledge;
}

.page-about .about-pledge {
  display: grid;
  gap: 12px;
  padding: 26px 0;
  border-top: 1px solid var(--line-light);
}

.page-about .about-pledge:last-child {
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-pledge__num {
  font-family: var(--font-num);
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--gold-300);
  text-shadow: 0 1px 0 rgba(11, 12, 14, 0.12);
}

.page-about .about-pledge__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-17);
  font-weight: 800;
}

.page-about .about-pledge__text p {
  margin: 0;
  max-width: 64ch;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-muted);
}

@media (min-width: 640px) {
  .page-about .about-pledge {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }
}

/* ---------- 侧栏 ---------- */
.page-about .about-side {
  min-width: 0;
}

@media (min-width: 980px) {
  .page-about .about-side {
    position: sticky;
    top: var(--about-sticky-top);
    align-self: start;
  }
}

.page-about .about-side__label {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: var(--fs-12);
  letter-spacing: 0.3em;
  color: var(--ink-faint);
}

.page-about .about-side__list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  border-top: 1px solid var(--line-light);
}

.page-about .about-side__list li {
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-side__list a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 12px 2px;
  font-size: var(--fs-14);
  line-height: 1.6;
  color: var(--ink-muted);
  text-decoration: none;
  transition: color 0.2s var(--ease-out), padding-left 0.2s var(--ease-out);
}

.page-about .about-side__list a span {
  font-family: var(--font-num);
  font-size: var(--fs-12);
  color: var(--gold-600);
}

.page-about .about-side__list a:hover,
.page-about .about-side__list a:focus-visible {
  color: var(--ink-text);
  padding-left: 8px;
}

.page-about .about-side__card {
  padding: 22px 18px;
  background: var(--ink-700);
  color: var(--paper-text);
}

.page-about .about-side__card .tag {
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  padding: 4px 12px;
}

.page-about .about-side__card p {
  margin: 14px 0 16px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--paper-muted);
}

.page-about .about-side__link {
  display: inline-block;
  font-size: var(--fs-14);
  color: var(--gold-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(240, 196, 98, 0.45);
  padding-bottom: 2px;
}

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

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  background: var(--ink-900);
  color: var(--paper-text);
  padding: clamp(56px, 7vw, 96px) 0;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 28px;
  align-items: center;
}

@media (min-width: 860px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }
}

.page-about .about-cta__title {
  margin: 10px 0 14px;
}

.page-about .about-cta__lede {
  margin: 0;
  max-width: 52ch;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--paper-muted);
}

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

@media (max-width: 480px) {
  .page-about .about-hero__title {
    letter-spacing: 0;
  }

  .page-about .about-cta__links .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .card.about-cluster,
  .page-about .about-side__list a,
  .page-about .about-quote__copy,
  .page-about .about-team {
    transition: none;
  }

  .page-about .card.about-cluster:hover {
    transform: none;
  }
}