.page-about {
  --about-index-w: 208px;
  --about-cut: 20px;
  --about-hair: rgba(36, 26, 20, 0.12);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background-color: var(--sand-cream);
  background-image: var(--grain-soft);
  padding-block: clamp(1.1rem, 3vw, 1.8rem) clamp(2rem, 5vw, 3.6rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -12%;
  top: -38%;
  width: min(62vw, 640px);
  aspect-ratio: 1;
  background: radial-gradient(circle at 42% 42%, rgba(240, 180, 74, 0.32), rgba(217, 96, 44, 0.12) 46%, transparent 72%);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 2.6rem);
  margin-top: clamp(1rem, 2.5vw, 1.8rem);
}

.page-about .about-kicker {
  margin: 0 0 0.8rem;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.95rem, 1.1rem + 3.9vw, 3.55rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 18ch;
}

.page-about .about-hero__lead {
  margin: clamp(1rem, 2.4vw, 1.5rem) 0 0;
  max-width: 60ch;
  font-size: var(--step0);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-slate {
  background: var(--poplar-ink);
  color: var(--sand-cream);
  padding: clamp(1.1rem, 2.6vw, 1.5rem);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-slate__cap {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.16em;
  color: var(--glow);
}

.page-about .about-slate__list {
  margin: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-slate__row {
  display: grid;
  gap: 0.15rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px dashed rgba(246, 239, 225, 0.22);
}

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

.page-about .about-slate dt {
  font-size: var(--step-1);
  letter-spacing: 0.08em;
  color: rgba(246, 239, 225, 0.7);
}

.page-about .about-slate dd {
  margin: 0;
  font-size: var(--step0);
  font-weight: 700;
  color: var(--sand-cream);
}

.page-about .about-slate dd.mono {
  font-family: var(--font-mono);
  color: var(--glow);
  letter-spacing: 0.06em;
}

/* ---------- 主体栅格 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2.8rem);
  padding-block: clamp(1.6rem, 4vw, 2.8rem) clamp(2.6rem, 6vw, 5rem);
}

.page-about .about-body {
  min-width: 0;
  max-width: 78ch;
}

/* ---------- 左侧索引 ---------- */
.page-about .about-index__cap {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.4rem;
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  white-space: nowrap;
  padding: 0.42rem 0.7rem;
  font-size: var(--step-1);
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--about-hair);
  background: var(--sand-paper);
  transition: background 0.18s ease, color 0.18s ease;
}

.page-about .about-index__n {
  font-family: var(--font-mono);
  color: var(--dune);
  font-size: 0.75rem;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  background: var(--sand-cream);
  border-color: var(--dune);
  color: var(--poplar-ink);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-block: clamp(1.7rem, 3.6vw, 2.6rem);
  scroll-margin-top: calc(var(--bar-h) + 1.4rem);
}

.page-about .about-sec:first-child {
  padding-top: 0.4rem;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin-bottom: 1rem;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  color: var(--dune);
  letter-spacing: 0.06em;
  flex: none;
}

.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step2);
  line-height: 1.24;
  color: var(--ink);
}

.page-about .about-sec h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step0);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-sec p {
  max-width: 68ch;
  margin: 0 0 1rem;
  font-size: var(--step0);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-sec p:last-child {
  margin-bottom: 0;
}

/* ---------- 分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(1.1rem, 2.6vw, 1.8rem);
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 0;
}

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

.page-about .about-figure figcaption {
  margin-top: 0.6rem;
  font-size: var(--step-1);
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 页边注数字 ---------- */
.page-about .about-note {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  margin: 0 0 1.1rem;
  padding-left: 0.1rem;
}

.page-about .about-note__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.6rem, 6.4vw, 4.2rem);
  line-height: 0.86;
  letter-spacing: -0.02em;
  color: var(--grape);
  flex: none;
}

.page-about .about-note__unit {
  font-size: 0.5em;
  color: var(--grape);
}

.page-about .about-note__text {
  font-size: var(--step-1);
  line-height: 1.5;
  color: var(--stone);
  max-width: 22ch;
}

/* ---------- 规模数字 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 1.4rem 0 1.5rem;
}

.page-about .about-stats__cell {
  background: var(--sand-paper);
  padding: 0.95rem 0.9rem 1.05rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .about-stats__cell--ink {
  background: var(--teal);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.55rem, 3.6vw, 2.3rem);
  line-height: 1;
  color: var(--poplar-ink);
  letter-spacing: -0.01em;
}

.page-about .about-stats__unit {
  font-size: 0.62em;
  margin-left: 0.1em;
}

.page-about .about-stats__label {
  display: block;
  margin-top: 0.5rem;
  font-size: var(--step-1);
  line-height: 1.45;
  color: var(--stone);
}

.page-about .about-stats__cell--ink .about-stats__num,
.page-about .about-stats__cell--ink .about-stats__label {
  color: var(--sand-cream);
}

/* ---------- 六边形人群 ---------- */
.page-about .hive {
  list-style: none;
  margin: 1.4rem 0 1.6rem;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.page-about .hive__cell {
  background: var(--sand-paper);
  padding: 1rem 1.1rem 1.15rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .hive__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--dune);
  margin-bottom: 0.3rem;
}

.page-about .hive__name {
  margin-bottom: 0.3rem;
}

.page-about .hive__desc {
  margin: 0;
  font-size: var(--step-1);
  line-height: 1.65;
  color: var(--stone);
  max-width: none;
}

/* ---------- 文档清单 ---------- */
.page-about .about-doclist {
  list-style: none;
  margin: 1.2rem 0 1.4rem;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-hair);
}

.page-about .about-doclist li {
  background: var(--sand-cream);
  padding: 0.75rem 0.9rem;
  font-size: var(--step-1);
  line-height: 1.65;
  color: var(--ink);
}

.page-about .about-doclist__k {
  display: inline-block;
  min-width: 5.6em;
  font-weight: 700;
  color: var(--teal);
  margin-right: 0.5rem;
}

/* ---------- 版本折线 ---------- */
.page-about .relay {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
}

.page-about .relay__item {
  position: relative;
  padding-left: 44px;
  padding-bottom: 1.7rem;
}

.page-about .relay__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.35rem;
  width: 14px;
  height: 14px;
  background: var(--sand-cream);
  border: 2px solid var(--dune);
  transform: rotate(45deg);
}

.page-about .relay__item::after {
  content: "";
  position: absolute;
  left: 12px;
  top: 1.35rem;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--dune), var(--poplar));
}

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

.page-about .relay__item:last-child::after {
  display: none;
}

.page-about .relay__item--now::before {
  background: var(--grape);
  border-color: var(--grape);
}

.page-about .relay__ver {
  display: inline-block;
  margin-bottom: 0.35rem;
  padding: 0.15rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  color: var(--grape);
  background: rgba(138, 63, 166, 0.1);
}

.page-about .relay__body p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--step-1);
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 10px;
  margin: 1.3rem 0 1.2rem;
}

.page-about .about-next__link {
  display: block;
  padding: 1rem 1.05rem 1.2rem;
  background: var(--sand-paper);
  border-top: 3px solid var(--dune);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  text-decoration: none;
  color: var(--ink);
  transition: transform 0.2s ease, background 0.2s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  transform: translateY(-2px);
  background: var(--sand-cream);
}

.page-about .about-next__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--dune);
}

.page-about .about-next__title {
  display: block;
  margin: 0.25rem 0 0.4rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step1);
  color: var(--poplar-ink);
}

.page-about .about-next__desc {
  display: block;
  font-size: var(--step-1);
  line-height: 1.65;
  color: var(--stone);
}

.page-about .about-next__foot {
  font-size: var(--step-1);
  color: var(--stone);
}

.page-about .about-next__foot a {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.58fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: start;
  }

  .page-about .about-split--team {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  }

  .page-about .about-note__num {
    margin-left: -0.06em;
  }

  .page-about .hive {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .page-about .hive__cell {
    aspect-ratio: 1 / 1.18;
    padding: 21% 11% 17%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
  }

  .page-about .hive__n {
    font-size: 0.66rem;
    margin-bottom: 0.2rem;
  }

  .page-about .hive__name {
    font-size: 0.98rem;
    margin-bottom: 0.25rem;
  }

  .page-about .hive__desc {
    font-size: 0.78rem;
    line-height: 1.55;
  }

  .page-about .relay__item:nth-child(2) {
    margin-left: 12px;
  }

  .page-about .relay__item:nth-child(3) {
    margin-left: 24px;
  }

  .page-about .relay__item:nth-child(4) {
    margin-left: 36px;
  }
}

/* ---------- 桌面：左侧固定索引 ---------- */
@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--bar-h) + 1.6rem);
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 0.15rem;
    padding-left: 0;
  }

  .page-about .about-index__link {
    border: 0;
    background: none;
    padding: 0.45rem 0 0.45rem 0.8rem;
    border-left: 2px solid var(--about-hair);
    font-size: var(--step0);
    white-space: normal;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: none;
    border-left-color: var(--dune);
    color: var(--poplar-ink);
  }

  .page-about .about-body {
    max-width: 74ch;
  }
}

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

  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}