.page-about {
  --about-line: 1px solid rgba(28, 31, 28, 0.14);
  --about-gold-line: 1px solid rgba(201, 164, 92, 0.45);
}

.page-about .about-crumbs {
  padding-top: clamp(18px, 3vw, 28px);
}

.page-about .breadcrumbs__item {
  display: inline;
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin: 0 0.55em;
  color: var(--mgm-graphite);
  opacity: 0.6;
}

.page-about .breadcrumbs__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--mgm-graphite);
}

.page-about .breadcrumbs__link {
  color: inherit;
  text-decoration: none;
}

.page-about .breadcrumbs__link:hover {
  color: var(--mgm-gold);
}

.page-about .breadcrumbs__link[aria-current="page"] {
  color: var(--mgm-ink-green);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 3vw, 36px);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero__lead {
  max-width: 42ch;
}

.page-about .about-hero__lede {
  margin-top: clamp(16px, 2vw, 24px);
  color: var(--mgm-graphite);
  max-width: 46ch;
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(20px, 3vw, 30px);
}

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

.page-about .about-hero__figure .media {
  border: 1px solid rgba(201, 164, 92, 0.5);
}

.page-about .about-hero__figure .figure__caption {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-top: 12px;
  font-size: 0.86rem;
  color: var(--mgm-graphite);
  line-height: 1.6;
}

.page-about .figure__num {
  color: var(--mgm-gold);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
}

/* ---------- 通用章节头 ---------- */
.page-about .about-head {
  max-width: 60ch;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-head__text {
  margin-top: 14px;
  color: var(--mgm-graphite);
  line-height: 1.85;
}

/* ---------- 年表 ---------- */
.page-about .about-timeline__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-timeline__index {
  border-top: var(--about-gold-line);
  padding-top: 14px;
}

.page-about .anchor-index__title {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mgm-graphite);
  margin: 0 0 12px;
}

.page-about .anchor-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.page-about .anchor-index__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  color: var(--mgm-ink-green);
  text-decoration: none;
  padding: 2px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .anchor-index__link:hover,
.page-about .anchor-index__link:focus-visible {
  color: var(--mgm-gold);
  border-bottom-color: var(--mgm-gold);
}

.page-about .anchor-index__link:focus-visible {
  outline: 2px solid var(--mgm-blue-green);
  outline-offset: 3px;
}

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

.page-about .year-node {
  position: relative;
  padding: 0 0 clamp(26px, 3.4vw, 40px) clamp(20px, 2.4vw, 30px);
  border-left: var(--about-gold-line);
}

.page-about .year-node:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .year-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--mgm-ivory);
  border: 2px solid var(--mgm-gold);
  box-sizing: content-box;
}

.page-about .year-node__num {
  margin: 0 0 6px;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--mgm-gold);
}

.page-about .year-node__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1.18rem, 2.1vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--mgm-green-deep);
  line-height: 1.4;
}

.page-about .year-node__text {
  margin: 0;
  max-width: 58ch;
  color: var(--mgm-graphite);
  line-height: 1.85;
}

/* ---------- 资料管理方法 ---------- */
.page-about .about-method__top {
  align-items: start;
  margin-bottom: clamp(32px, 4.5vw, 56px);
}

.page-about .about-method__intro .prose {
  margin-top: 16px;
  color: var(--mgm-graphite);
}

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

.page-about .about-method__figure .media {
  border: 1px solid rgba(28, 31, 28, 0.12);
  background: var(--mgm-paper);
}

.page-about .about-method__figure .figure__caption {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-top: 12px;
  font-size: 0.86rem;
  color: var(--mgm-graphite);
  line-height: 1.6;
}

.page-about .method-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  counter-reset: method;
}

.page-about .method-flow__step {
  position: relative;
  padding: 22px 20px 22px;
  background: var(--mgm-ivory);
  border: var(--about-line);
  border-top: 2px solid var(--mgm-gold);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.page-about .method-flow__step:hover,
.page-about .method-flow__step:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: rgba(201, 164, 92, 0.7);
}

.page-about .method-flow__step:focus-within {
  outline: 2px solid var(--mgm-blue-green);
  outline-offset: 3px;
}

.page-about .method-flow__num {
  display: block;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--mgm-gold);
  margin-bottom: 10px;
}

.page-about .method-flow__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1.06rem, 1.7vw, 1.22rem);
  font-weight: 700;
  color: var(--mgm-green-deep);
  line-height: 1.45;
}

.page-about .method-flow__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--mgm-graphite);
}

.page-about .about-method__note {
  margin-top: clamp(26px, 3.5vw, 40px);
  padding: 20px 22px;
  background: var(--mgm-paper);
  border-left: 3px solid var(--mgm-burgundy);
}

.page-about .about-method__note .note__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--mgm-burgundy);
  margin-bottom: 8px;
}

.page-about .about-method__note p {
  margin: 0;
  max-width: 70ch;
  color: var(--mgm-charcoal);
  line-height: 1.85;
}

/* ---------- 团队与协作 ---------- */
.page-about .about-team__grid {
  align-items: start;
}

.page-about .about-team__body .prose {
  margin-top: 16px;
  color: var(--mgm-graphite);
}

.page-about .about-team__list {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  border-top: var(--about-gold-line);
}

.page-about .about-team__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: var(--about-line);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--mgm-charcoal);
}

.page-about .about-team__list .mono {
  min-width: 4.2em;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--mgm-gold);
}

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

.page-about .about-team__figure .media {
  border: 1px solid rgba(28, 31, 28, 0.12);
}

.page-about .about-team__figure .figure__caption {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-top: 12px;
  font-size: 0.86rem;
  color: var(--mgm-graphite);
  line-height: 1.6;
}

/* ---------- 服务体量 ---------- */
.page-about .about-scale {
  background: var(--mgm-green-deep);
  color: var(--mgm-ivory);
}

.page-about .about-scale .eyebrow {
  color: var(--mgm-gold-soft);
}

.page-about .about-scale__head {
  max-width: 62ch;
  margin-bottom: clamp(30px, 4vw, 52px);
}

.page-about .about-scale__head .display {
  color: var(--mgm-ivory);
}

.page-about .about-scale__lede {
  margin-top: 16px;
  color: rgba(244, 239, 228, 0.78);
  line-height: 1.85;
}

.page-about .about-scale__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid rgba(201, 164, 92, 0.4);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 0;
  border-bottom: 1px solid rgba(201, 164, 92, 0.22);
}

.page-about .about-stat__value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.9rem, 5vw, 2.9rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--mgm-gold-soft);
}

.page-about .about-stat__label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: rgba(244, 239, 228, 0.72);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-next__head {
  max-width: 34ch;
}

.page-about .about-next__links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: var(--about-gold-line);
}

.page-about .about-next__link {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 18px 0;
  border-bottom: var(--about-line);
  text-decoration: none;
  color: var(--mgm-ink-green);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  color: var(--mgm-burgundy);
  padding-left: 6px;
}

.page-about .about-next__link:focus-visible {
  outline: 2px solid var(--mgm-blue-green);
  outline-offset: 4px;
}

.page-about .about-next__link-num {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--mgm-gold);
}

.page-about .about-next__link-text {
  font-size: 1rem;
  line-height: 1.6;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-scale__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 48px);
  }

  .page-about .method-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 6vw, 84px);
  }

  .page-about .about-hero__figure {
    transform: translateY(26px);
  }

  .page-about .about-timeline__layout {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-timeline__index {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    align-self: start;
  }

  .page-about .anchor-index__list {
    flex-direction: column;
    gap: 6px;
  }

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

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: clamp(36px, 6vw, 80px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-scale__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: clamp(28px, 4vw, 56px);
  }
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .about-stat {
    animation: about-rise 0.6s ease-out both;
  }

  .page-about .about-stat:nth-child(2) {
    animation-delay: 0.06s;
  }

  .page-about .about-stat:nth-child(3) {
    animation-delay: 0.12s;
  }

  .page-about .about-stat:nth-child(4) {
    animation-delay: 0.18s;
  }

  .page-about .about-stat:nth-child(5) {
    animation-delay: 0.24s;
  }

  .page-about .about-stat:nth-child(6) {
    animation-delay: 0.3s;
  }

  @keyframes about-rise {
    from {
      opacity: 0;
      transform: translateY(12px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .method-flow__step,
  .page-about .about-next__link {
    transition: none;
  }
}

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