.page-about {
  --about-line: rgba(34, 37, 34, 0.14);
  --about-line-dark: rgba(248, 245, 239, 0.2);
  --about-muted: #4a4f4a;
  background: var(--mist);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.1rem, 3.5vw, 2.2rem) clamp(2.6rem, 7vw, 5rem);
  background: var(--mist);
}

.page-about .hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  right: -14%;
  top: 16%;
  width: min(72%, 660px);
  height: clamp(200px, 40vw, 430px);
  background: var(--sand);
  transform: rotate(-7deg);
  opacity: 0.9;
}

.page-about .hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  right: 4%;
  top: 34%;
  width: min(48%, 430px);
  height: clamp(110px, 22vw, 240px);
  background: var(--moss);
  transform: rotate(6deg);
  opacity: 0.92;
}

.page-about .hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
}

.page-about .hero-lead {
  max-width: 46ch;
  margin: 1.1rem 0 0;
  font-size: clamp(0.95rem, 2.2vw, 1.05rem);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 1.5rem 0 0;
}

.page-about .hero-side {
  padding: clamp(1rem, 3vw, 1.5rem);
  border-radius: var(--radius);
  align-self: start;
}

.page-about .side-title {
  margin: 0 0 1rem;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .hero-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 0.9rem;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 4.5vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--moss);
}

.page-about .stat-label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.76rem;
  line-height: 1.45;
  color: var(--about-muted);
}

/* ---------- 章节导览 ---------- */
.page-about .contents {
  background: var(--night);
  color: var(--mist);
}

.page-about .contents-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  padding-block: 0.85rem;
}

.page-about .contents .index-label {
  color: var(--sand);
  flex: 0 0 auto;
}

.page-about .contents ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1.1rem;
}

.page-about .contents a {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 0.83rem;
  color: rgba(248, 245, 239, 0.72);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .contents a:hover,
.page-about .contents a:focus-visible,
.page-about .contents a[data-active] {
  color: var(--warn);
  border-bottom-color: var(--warn);
}

/* ---------- 章节基座 ---------- */
.page-about .chapter {
  padding-block: clamp(2.4rem, 6vw, 5rem);
  background: var(--mist);
}

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

.page-about .chapter--dark {
  background: var(--moss);
  color: var(--mist);
  border-top: 4px solid var(--sand);
}

.page-about .chapter-grid {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.6rem);
}

.page-about .chapter-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.4rem, 7vw, 4.2rem);
  line-height: 0.86;
  font-weight: 700;
  letter-spacing: -0.05em;
  color: var(--track);
  opacity: 0.92;
}

.page-about .chapter-title {
  margin: 0.55rem 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.6vw, 2rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--moss);
}

.page-about .chapter-aside {
  margin: 0;
  max-width: 30ch;
  padding: 0.85rem 1rem;
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--night);
  background: rgba(174, 186, 180, 0.24);
  border-left: 3px solid var(--sand);
}

.page-about .chapter--dark .chapter-title {
  color: var(--sand-paper);
}

.page-about .chapter--dark .chapter-aside {
  color: rgba(248, 245, 239, 0.86);
  background: rgba(248, 245, 239, 0.08);
  border-left-color: var(--sand);
}

.page-about .chapter--dark .chapter-num {
  color: var(--sand);
}

/* ---------- 图片 ---------- */
.page-about .story-figure {
  margin: 0 0 0.6rem;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--glass);
}

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

.page-about .media-cap {
  margin: 0 0 1.8rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--steel);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .chapter--dark .media-cap {
  color: rgba(248, 245, 239, 0.7);
  border-left-color: var(--sand);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 2.1rem;
  position: relative;
  display: grid;
  gap: 1.6rem;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 2px;
  background: linear-gradient(180deg, var(--sand), var(--moss));
}

.page-about .tl-item {
  position: relative;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -2.1rem;
  top: 0.45rem;
  width: 16px;
  height: 16px;
  background: var(--track);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px var(--mist);
}

.page-about .tl-year {
  display: inline-block;
  margin-bottom: 0.45rem;
  padding: 0.22rem 0.6rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--mist);
  background: var(--moss);
}

.page-about .tl-item h3 {
  margin: 0 0 0.35rem;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--moss);
}

.page-about .tl-item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--about-muted);
}

/* ---------- 编辑流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: flow;
  border-top: 1px solid var(--about-line);
}

.page-about .flow li {
  counter-increment: flow;
  position: relative;
  padding: 1.1rem 0.2rem 1.1rem 3.1rem;
  border-bottom: 1px solid var(--about-line);
}

.page-about .flow li::before {
  content: "0" counter(flow);
  position: absolute;
  left: 0;
  top: 1.05rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--sand);
}

.page-about .flow h3 {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .flow p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--about-muted);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 0.9rem;
}

.page-about .team-card {
  padding: 1.2rem 1.1rem 1.3rem;
  background: var(--mist);
  border-left: 3px solid var(--moss);
  box-shadow: 0 12px 26px -22px rgba(15, 36, 28, 0.85);
}

.page-about .team-card:nth-child(2) {
  border-left-color: var(--sand);
}

.page-about .team-card:nth-child(3) {
  border-left-color: var(--track);
}

.page-about .team-card:nth-child(4) {
  border-left-color: var(--steel);
}

.page-about .team-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--moss);
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--about-muted);
}

/* ---------- 合作网络 ---------- */
.page-about .eco-strip {
  list-style: none;
  margin: 0 0 1.8rem;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line-dark);
}

.page-about .eco-strip li {
  padding: 0.95rem 0.85rem;
  background: var(--night);
}

.page-about .eco-strip .num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.4rem, 4vw, 1.95rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--sand);
}

.page-about .eco-strip li > span + span {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.76rem;
  line-height: 1.4;
  color: rgba(248, 245, 239, 0.76);
}

.page-about .honor-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .honor-list li {
  padding-left: 0.9rem;
  border-left: 2px solid rgba(201, 147, 59, 0.55);
}

.page-about .honor-list h3 {
  margin: 0 0 0.3rem;
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--sand-paper);
}

.page-about .honor-list p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.8;
  color: rgba(248, 245, 239, 0.76);
}

/* ---------- 更新节奏 ---------- */
.page-about .rhythm {
  display: grid;
  gap: 0;
  border-top: 1px solid rgba(34, 37, 34, 0.18);
}

.page-about .rhythm-row {
  display: grid;
  gap: 0.35rem;
  padding: 1.05rem 0;
  border-bottom: 1px solid rgba(34, 37, 34, 0.18);
}

.page-about .rhythm-key {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--track);
}

.page-about .rhythm-row p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .rhythm-row a,
.page-about .promise a,
.page-about .promise-foot a {
  color: var(--moss);
  text-decoration: none;
  border-bottom: 1px solid var(--sand);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .rhythm-row a:hover,
.page-about .promise a:hover,
.page-about .promise-foot a:hover {
  color: var(--track);
  border-bottom-color: var(--track);
}

/* ---------- 合作承诺 ---------- */
.page-about .promise-grid {
  display: grid;
  gap: 0.9rem;
}

.page-about .promise {
  padding: 1.15rem 1.1rem;
  background: rgba(201, 147, 59, 0.1);
  border-top: 3px solid var(--moss);
}

.page-about .promise:nth-child(even) {
  border-top-color: var(--track);
}

.page-about .promise h3 {
  margin: 0 0 0.4rem;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--moss);
}

.page-about .promise p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--about-muted);
}

.page-about .promise-foot {
  margin: 1.3rem 0 0;
  padding: 0.9rem 1rem;
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--night);
  background: rgba(174, 186, 180, 0.24);
  border-left: 3px solid var(--steel);
}

/* ---------- 收尾 ---------- */
.page-about .closing {
  position: relative;
  padding-block: clamp(2.6rem, 7vw, 5rem);
  background: var(--night);
  color: var(--mist);
  border-top: 5px solid var(--track);
}

.page-about .closing-inner {
  display: grid;
  gap: 0.9rem;
}

.page-about .closing-kicker {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--sand);
}

.page-about .closing h2 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--sand-paper);
}

.page-about .closing-copy {
  margin: 0;
  max-width: 52ch;
  font-size: 0.9rem;
  line-height: 1.85;
  color: rgba(248, 245, 239, 0.78);
}

.page-about .closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 0.5rem 0 0;
}

/* ---------- 响应式 ---------- */
@media (max-width: 779px) {
  .page-about .hero::before {
    right: -46%;
    top: 22%;
    opacity: 0.3;
  }

  .page-about .hero::after {
    right: -32%;
    top: 40%;
    opacity: 0.22;
  }
}

@media (min-width: 640px) {
  .page-about .team-grid,
  .page-about .promise-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .rhythm-row {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    align-items: baseline;
    gap: 1rem;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-about .chapter-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .chapter-side {
    position: sticky;
    top: 1.5rem;
  }

  .page-about .eco-strip {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .honor-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.4rem;
  }

  .page-about .closing-inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
    align-items: end;
    column-gap: 2.5rem;
  }

  .page-about .closing-kicker {
    grid-column: 1 / -1;
  }

  .page-about .closing h2 {
    grid-column: 1;
  }

  .page-about .closing-copy {
    grid-column: 1;
  }

  .page-about .closing-actions {
    grid-column: 2;
    grid-row: 2 / span 2;
    justify-content: flex-end;
    align-self: end;
    margin: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .contents a,
  .page-about .rhythm-row a,
  .page-about .promise a,
  .page-about .promise-foot a {
    transition: none;
  }
}