.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(20px, 3vw, 30px);
}
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .82rem;
  letter-spacing: .04em;
  color: var(--sage);
}
.page-about .breadcrumb a {
  color: var(--sage);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .breadcrumb a:hover {
  color: var(--ink-green);
  border-bottom-color: var(--amber);
}
.page-about .breadcrumb__sep {
  color: rgba(94, 110, 99, .6);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(28px, 5vw, 52px) 0 clamp(36px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 90% -10%, rgba(201, 138, 43, .18), transparent 62%),
    radial-gradient(90% 70% at 6% 110%, rgba(79, 124, 130, .13), transparent 60%),
    linear-gradient(180deg, #FBF7EE 0%, var(--paper) 100%);
  border-bottom: 1px solid rgba(16, 24, 32, .09);
}
.page-about .about-hero__inner {
  display: grid;
  gap: 30px;
}
.page-about .about-hero__lead h1 {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(2.15rem, 8vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: -.015em;
  color: var(--ink-green);
}
.page-about .about-hero__sub {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: clamp(.95rem, 2.4vw, 1.06rem);
  line-height: 1.85;
  color: rgba(16, 24, 32, .84);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .record-card {
  position: relative;
  padding: 20px 20px 22px;
  border-radius: var(--radius-m);
  background: var(--ink-green);
  color: var(--cream);
  box-shadow: var(--shadow-glass);
  overflow: hidden;
}
.page-about .record-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: linear-gradient(180deg, var(--amber), var(--celadon));
}
.page-about .record-card__label {
  margin: 0 0 14px;
  font-size: .74rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--amber);
}
.page-about .record-card__list {
  margin: 0;
  display: grid;
  gap: 12px;
}
.page-about .record-card__row {
  display: grid;
  gap: 3px;
  padding-bottom: 11px;
  border-bottom: 1px solid rgba(255, 253, 248, .13);
}
.page-about .record-card__row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}
.page-about .record-card__row dt {
  font-size: .74rem;
  letter-spacing: .08em;
  color: rgba(255, 253, 248, .62);
}
.page-about .record-card__row dd {
  margin: 0;
  font-size: .92rem;
  color: var(--cream);
  word-break: break-word;
}
.page-about .record-card__row dd.mono {
  font-family: var(--font-mono);
  font-size: .86rem;
  letter-spacing: .01em;
}

/* ---------- 通用区块与双栏 ---------- */
.page-about .section {
  padding: clamp(44px, 7vw, 88px) 0;
}
.page-about .section + .section {
  border-top: 1px solid rgba(16, 24, 32, .08);
}
.page-about h2 {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.6vw, 2.35rem);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--ink-green);
}
.page-about .about-split {
  display: grid;
  gap: 26px;
}
.page-about .about-split__main > .prose {
  margin-top: 18px;
}
.page-about .prose p {
  margin: 0 0 1.05em;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(16, 24, 32, .86);
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}
.page-about .about-note {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid rgba(201, 138, 43, .55);
  font-size: .84rem;
  line-height: 1.85;
  color: var(--sage);
}
.page-about .about-note a {
  color: var(--ink-green-lift);
  text-decoration: none;
  border-bottom: 1px solid rgba(30, 90, 74, .4);
}
.page-about .about-note a:hover {
  border-bottom-color: var(--amber);
}

.page-about .about-media {
  margin: 0;
  border-radius: var(--radius-m);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.page-about .about-media .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-origin__band {
  margin-top: clamp(28px, 5vw, 48px);
}
.page-about .about-figcaption {
  margin: 12px 0 0;
  font-size: .8rem;
  letter-spacing: .03em;
  color: var(--sage);
}

/* ---------- 段位轴 ---------- */
.page-about .rank-axis {
  list-style: none;
  margin: 30px 0 0;
  padding: 4px 2px 14px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(136px, 1fr);
  gap: 10px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}
.page-about .rank-node {
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 15px 14px 17px;
  border-radius: var(--radius-m);
  background: var(--cream);
  border: 1px solid rgba(16, 24, 32, .1);
  border-top: 3px solid var(--celadon);
  box-shadow: var(--shadow-card);
}
.page-about .rank-node--celadon { border-top-color: var(--celadon); }
.page-about .rank-node--amber { border-top-color: var(--amber); }
.page-about .rank-node--ink { border-top-color: var(--ink-green-lift); }
.page-about .rank-node--crown {
  background: linear-gradient(180deg, var(--ink-green) 0%, var(--ink-green-lift) 100%);
  border-color: rgba(201, 138, 43, .5);
}
.page-about .rank-node--crown .rank-node__name { color: var(--amber-soft); }
.page-about .rank-node--crown .rank-node__range { color: var(--cream); }

.page-about .rank-node__name {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: .06em;
  color: var(--ink-green);
}
.page-about .rank-node__range {
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .01em;
  color: var(--celadon-deep);
}
.page-about .rank-node--amber .rank-node__range { color: var(--amber-ink); }
.page-about .rank-node--ink .rank-node__range { color: var(--ink-green-lift); }

/* ---------- 会员中心 ---------- */
.page-about .about-member__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(16, 24, 32, .84);
}
.page-about .about-member__grid {
  margin-top: 30px;
  display: grid;
  gap: 26px;
}
.page-about .about-member__figure {
  margin: 0;
}

.page-about .benefit {
  border: 1px solid rgba(16, 24, 32, .11);
  border-radius: var(--radius-m);
  background: var(--cream);
  overflow: hidden;
}
.page-about .benefit + .benefit {
  margin-top: 10px;
}
.page-about .benefit[open] {
  box-shadow: var(--shadow-card);
  border-color: rgba(201, 138, 43, .5);
}
.page-about .benefit__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 16px;
  background: var(--amber-soft);
  cursor: pointer;
  list-style: none;
}
.page-about .benefit__head::-webkit-details-marker { display: none; }
.page-about .benefit__head::marker { content: ""; }
.page-about .benefit__index {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--amber-ink);
}
.page-about .benefit__title {
  flex: 1 1 auto;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--ink-green);
}
.page-about .benefit__hint {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-right: 4px;
  border-right: 2px solid var(--ink-green);
  border-bottom: 2px solid var(--ink-green);
  transform: rotate(45deg);
  transition: transform .25s var(--ease);
}
.page-about .benefit[open] .benefit__hint {
  transform: rotate(-135deg);
}
.page-about .benefit__body {
  padding: 16px 16px 20px;
}
.page-about .benefit__body p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.82;
  color: rgba(16, 24, 32, .84);
}

/* ---------- 团队 ---------- */
.page-about .team-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.page-about .team-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 16px 18px;
  border-radius: var(--radius-m);
  background: var(--cream);
  border: 1px solid rgba(16, 24, 32, .1);
  border-left: 3px solid var(--celadon);
}
.page-about .team-item:nth-child(2) { border-left-color: var(--amber); }
.page-about .team-item:nth-child(3) { border-left-color: var(--cinnabar); }
.page-about .team-item__no {
  font-family: var(--font-mono);
  font-size: .82rem;
  line-height: 1.9;
  color: var(--sage);
}
.page-about .team-item__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--ink-green);
}
.page-about .team-item__body p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.8;
  color: rgba(16, 24, 32, .82);
}
.page-about .about-team__rhythm {
  margin: 22px 0 0;
  padding: 16px 18px;
  border-radius: var(--radius-m);
  background: rgba(18, 60, 50, .06);
  font-size: .93rem;
  line-height: 1.82;
  color: var(--ink-green);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 32px 0 0;
  padding: 0 0 0 34px;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--amber) 0%, var(--celadon) 52%, var(--ink-green-lift) 100%);
}
.page-about .timeline__item {
  position: relative;
  padding-bottom: 28px;
}
.page-about .timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 5px;
  width: 18px;
  height: 18px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--amber);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}
.page-about .timeline__item--celadon::before {
  border-color: var(--celadon);
}
.page-about .timeline__item:hover::before {
  transform: scale(1.15);
  box-shadow: 0 0 0 5px rgba(201, 138, 43, .16);
}
.page-about .timeline__item--celadon:hover::before {
  box-shadow: 0 0 0 5px rgba(79, 124, 130, .18);
}
.page-about .timeline__era {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .12em;
  color: var(--amber-ink);
}
.page-about .timeline__item--celadon .timeline__era {
  color: var(--celadon-deep);
}
.page-about .timeline__title {
  margin: 6px 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.05rem, 3.4vw, 1.24rem);
  line-height: 1.4;
  color: var(--ink-green);
}
.page-about .timeline__text {
  margin: 0;
  max-width: 56ch;
  font-size: .94rem;
  line-height: 1.82;
  color: rgba(16, 24, 32, .82);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__lede {
  margin: 18px 0 0;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(16, 24, 32, .84);
}
.page-about .eco {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 28px;
}
.page-about .eco__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}
.page-about .eco__pill {
  order: 0;
  display: inline-block;
  padding: 8px 15px;
  border-radius: 999px;
  border: 1px solid rgba(18, 60, 50, .28);
  background: transparent;
  color: var(--ink-green);
  font-size: .86rem;
  letter-spacing: .02em;
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .eco__pill:hover {
  border-color: var(--amber);
}
.page-about .eco__radio:checked + .eco__pill {
  background: var(--ink-green);
  border-color: var(--ink-green);
  color: var(--amber-soft);
}
.page-about .eco__radio:focus-visible + .eco__pill {
  outline: 2px solid var(--cinnabar);
  outline-offset: 2px;
}
.page-about .eco__list {
  order: 1;
  flex: 1 0 100%;
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .eco__item {
  padding: 18px 18px 20px;
  border-radius: var(--radius-m);
  background: var(--cream);
  border: 1px solid rgba(16, 24, 32, .1);
  box-shadow: var(--shadow-card);
}
.page-about .eco__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.04rem;
  color: var(--ink-green);
}
.page-about .eco__item p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.82;
  color: rgba(16, 24, 32, .82);
}
.page-about #eco-research:checked ~ .eco__list .eco__item:not([data-cat="research"]),
.page-about #eco-author:checked ~ .eco__list .eco__item:not([data-cat="author"]),
.page-about #eco-tester:checked ~ .eco__list .eco__item:not([data-cat="tester"]) {
  display: none;
}

/* ---------- 下一步 ---------- */
.page-about .next-grid {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .next-card {
  padding: 20px 18px 22px;
  border-radius: var(--radius-m);
  background: var(--cream);
  border: 1px solid rgba(16, 24, 32, .1);
  border-bottom: 3px solid var(--amber);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}
.page-about .next-card:nth-child(2) { border-bottom-color: var(--celadon); }
.page-about .next-card:nth-child(3) { border-bottom-color: var(--ink-green-lift); }
.page-about .next-card:nth-child(4) { border-bottom-color: var(--cinnabar); }
.page-about .next-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}
.page-about .next-card__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--sage);
}
.page-about .next-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.06rem;
}
.page-about .next-card h3 a {
  color: var(--ink-green);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 138, 43, .5);
}
.page-about .next-card h3 a:hover {
  border-bottom-color: var(--ink-green);
}
.page-about .next-card p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: rgba(16, 24, 32, .78);
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about .about-member__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
    gap: 32px;
  }
  .page-about .about-member__figure {
    position: sticky;
    top: 118px;
  }
  .page-about .eco__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(280px, .85fr);
    gap: 52px;
    align-items: end;
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: 56px;
    align-items: start;
  }
  .page-about .about-split__note {
    position: sticky;
    top: 118px;
  }
  .page-about .team-list {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 1100px) {
  .page-about .rank-axis {
    grid-auto-flow: row;
    grid-template-columns: repeat(9, minmax(0, 1fr));
    grid-auto-columns: auto;
    overflow-x: visible;
    padding-bottom: 4px;
    gap: 8px;
  }
  .page-about .rank-node {
    padding: 14px 11px 16px;
  }
  .page-about .rank-node__name {
    font-size: .96rem;
  }
  .page-about .rank-node__range {
    font-size: .76rem;
  }
  .page-about .eco__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .timeline {
    padding-left: 40px;
  }
  .page-about .timeline__item::before {
    left: -40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rank-node,
  .page-about .next-card,
  .page-about .benefit__hint,
  .page-about .timeline__item::before,
  .page-about .eco__pill {
    transition: none;
  }
  .page-about .next-card:hover {
    transform: none;
  }
  .page-about .timeline__item:hover::before {
    transform: none;
    box-shadow: none;
  }
}