.page-about {
  --about-line: rgba(143, 184, 182, 0.22);
  --about-line-strong: rgba(143, 184, 182, 0.42);
  counter-reset: about-chapter;
  background: var(--night);
  color: var(--grey);
  padding-bottom: 0;
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about p {
  line-height: 1.8;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 22px 0 48px;
  background:
    radial-gradient(120% 88% at 86% -6%, rgba(14, 78, 92, 0.9) 0%, rgba(10, 24, 38, 0) 60%),
    var(--night);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 8vw, 62px);
  line-height: 1.03;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--grey);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line-strong);
  border: 3px solid var(--plateau);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px 18px;
  background: var(--night);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(24px, 6vw, 36px);
  line-height: 1;
  color: var(--orange);
  letter-spacing: -0.02em;
}

.page-about .about-stat__num em {
  font-style: normal;
  font-size: 0.46em;
  margin-left: 3px;
  color: var(--lime);
  vertical-align: 0.25em;
}

.page-about .about-stat__label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--mist);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 3px solid var(--plateau);
  box-shadow: 10px 10px 0 var(--ink);
  background: var(--ink);
  overflow: hidden;
}

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

.page-about .about-hero__cap {
  padding: 11px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--grey);
  background: var(--ink);
  border-top: 2px solid var(--plateau);
}

/* ---------- 目录跳转带 ---------- */
.page-about .about-jump {
  background: var(--plateau);
  border-top: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
}

.page-about .about-jump__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  padding: 13px 0;
}

.page-about .about-jump__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--lime);
}

.page-about .about-jump__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-jump a {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 13.5px;
  color: var(--grey);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--step), border-color var(--step);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--orange);
  outline: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  counter-increment: about-chapter;
  padding: 54px 0 58px;
  border-top: 1px solid var(--about-line);
}

.page-about .chapter__band {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .chapter__num {
  display: inline-block;
  padding: 4px 8px 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--night);
  background: var(--orange);
}

.page-about .chapter__num::before {
  content: counter(about-chapter, decimal-leading-zero);
}

.page-about .chapter__kicker {
  text-transform: uppercase;
}

.page-about .chapter__title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(27px, 6vw, 44px);
  line-height: 1.07;
  color: var(--white);
}

.page-about .chapter--panel {
  background: linear-gradient(180deg, rgba(14, 78, 92, 0.42) 0%, rgba(14, 78, 92, 0.08) 100%);
}

.page-about .chapter--paper {
  background: var(--paper);
  color: var(--brown);
  border-top-color: var(--brown);
}

.page-about .chapter--paper .chapter__kicker,
.page-about .chapter--paper .chapter__band {
  color: rgba(28, 21, 16, 0.6);
}

.page-about .chapter--paper .chapter__num {
  color: var(--paper);
  background: var(--brown);
}

.page-about .chapter--paper .chapter__title {
  color: var(--brown);
}

.page-about .about-lead {
  margin: 0 0 30px;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--grey);
}

.page-about .about-lead--paper {
  color: rgba(28, 21, 16, 0.78);
}

/* ---------- 起点与坐标 ---------- */
.page-about .about-origin {
  display: grid;
  gap: 30px;
}

.page-about .about-origin__lead p {
  margin: 0 0 16px;
  font-size: 15.5px;
  color: var(--grey);
}

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

.page-about .about-facts {
  margin: 0;
  border: 3px solid var(--plateau);
  box-shadow: 8px 8px 0 var(--ink);
  background: rgba(6, 16, 21, 0.72);
}

.page-about .about-facts > div {
  padding: 13px 16px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-facts > div:last-child {
  border-bottom: none;
}

.page-about .about-facts dt {
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-facts dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--white);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin: 8px 0 0;
  padding: 0 0 0 4px;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 34px 26px;
  border-left: 2px solid var(--about-line-strong);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--night);
  border: 2px solid var(--orange);
  transition: background var(--step), border-color var(--step), transform var(--step);
}

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

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--orange);
  transform: scale(1.25);
}

.page-about .about-timeline__item--now:hover::before,
.page-about .about-timeline__item--now:focus-within::before {
  background: var(--lime);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-timeline__item--now .about-timeline__year {
  color: var(--lime);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18.5px;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14.5px;
  color: var(--grey);
}

.page-about .about-timeline__meter {
  display: block;
  margin-top: 14px;
  height: 6px;
  max-width: 340px;
  background: rgba(143, 184, 182, 0.16);
  overflow: hidden;
}

.page-about .about-timeline__meter i {
  display: block;
  height: 100%;
  width: var(--fill, 50%);
  background: linear-gradient(90deg, var(--plateau), var(--orange));
  transition: background var(--step-slow);
}

.page-about .about-timeline__item--now .about-timeline__meter i {
  background: linear-gradient(90deg, var(--plateau), var(--lime));
}

/* ---------- 内容与数据能力 ---------- */
.page-about .about-cap {
  display: grid;
  gap: 30px;
}

.page-about .about-cap__figure {
  margin: 0;
  border: 3px solid var(--ink);
  box-shadow: 9px 9px 0 var(--plateau);
  background: var(--ink);
  overflow: hidden;
}

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

.page-about .about-cap__cap {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--grey);
  border-top: 2px solid var(--plateau);
}

.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .about-step {
  position: relative;
  padding: 16px 18px 18px;
  border: 3px solid var(--about-line-strong);
  background: rgba(6, 16, 21, 0.55);
  transition: border-color var(--step), box-shadow var(--step), transform var(--step);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within {
  border-color: var(--orange);
  box-shadow: 6px 6px 0 var(--ink);
  transform: translate(-2px, -2px);
}

.page-about .about-step__num {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14.5px;
  color: var(--grey);
}

.page-about .about-databand {
  display: grid;
  gap: 1px;
  margin-top: 30px;
  background: var(--about-line-strong);
  border: 3px solid var(--ink);
}

.page-about .about-databand__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px;
  background: var(--night);
}

.page-about .about-databand__num {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 600;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-databand__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-cap__tail {
  margin: 26px 0 0;
  max-width: 68ch;
  font-size: 15px;
  color: var(--grey);
}

.page-about .about-cap__tail a,
.page-about .about-eco__tail a {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 2px solid rgba(255, 106, 43, 0.45);
  transition: color var(--step), border-color var(--step);
}

.page-about .about-cap__tail a:hover,
.page-about .about-cap__tail a:focus-visible,
.page-about .about-eco__tail a:hover,
.page-about .about-eco__tail a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
  outline: none;
}

/* ---------- 团队与作者网络 ---------- */
.page-about .about-team {
  display: grid;
  gap: 30px;
}

.page-about .about-team__roles {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-role {
  padding: 16px 18px;
  border: 3px solid var(--ink);
  border-left: 6px solid var(--orange);
  background: rgba(6, 16, 21, 0.6);
  transition: border-left-color var(--step), background var(--step), box-shadow var(--step);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-left-color: var(--lime);
  box-shadow: 7px 7px 0 var(--ink);
}

.page-about .about-role dt {
  margin-bottom: 7px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .about-role dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--grey);
}

.page-about .about-team__figure {
  margin: 0;
  border: 3px solid var(--plateau);
  box-shadow: 9px 9px 0 var(--ink);
  background: var(--ink);
  overflow: hidden;
}

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

.page-about .about-team__cap {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--grey);
  border-top: 2px solid var(--plateau);
}

/* ---------- 合作生态（奶油纸章节） ---------- */
.page-about .about-eco {
  display: grid;
  gap: 16px;
}

.page-about .about-eco__item {
  padding: 18px 18px 20px;
  background: rgba(255, 255, 255, 0.62);
  border: 3px solid var(--brown);
  box-shadow: 7px 7px 0 rgba(28, 21, 16, 0.16);
  transition: box-shadow var(--step), transform var(--step);
}

.page-about .about-eco__item:hover,
.page-about .about-eco__item:focus-within {
  box-shadow: 10px 10px 0 rgba(28, 21, 16, 0.28);
  transform: translate(-2px, -2px);
}

.page-about .about-eco__item h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  color: var(--brown);
}

.page-about .about-eco__item p {
  margin: 0;
  font-size: 14.5px;
  color: rgba(28, 21, 16, 0.78);
}

.page-about .about-honor {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: rgba(28, 21, 16, 0.24);
  border: 3px solid var(--brown);
}

.page-about .about-honor__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  background: var(--paper);
}

.page-about .about-honor__num {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 600;
  line-height: 1;
  color: var(--brown);
}

.page-about .about-honor__cell:first-child .about-honor__num {
  color: #a8681f;
}

.page-about .about-honor__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(28, 21, 16, 0.72);
}

.page-about .about-eco__tail {
  margin: 26px 0 0;
  max-width: 68ch;
  font-size: 15px;
  color: rgba(28, 21, 16, 0.8);
}

.page-about .about-eco__tail a {
  color: #a8681f;
  border-bottom-color: rgba(168, 104, 31, 0.5);
}

.page-about .about-eco__tail a:hover,
.page-about .about-eco__tail a:focus-visible {
  color: var(--brown);
  border-bottom-color: var(--brown);
}

/* ---------- 怎么开始合作 ---------- */
.page-about .about-paths {
  display: grid;
  gap: 18px;
}

.page-about .about-path {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 20px 24px;
  border: 3px solid var(--ink);
  border-top: 6px solid var(--sand);
  background: rgba(6, 16, 21, 0.62);
  transition: border-top-color var(--step), box-shadow var(--step), transform var(--step);
}

.page-about .about-path:hover,
.page-about .about-path:focus-within {
  border-top-color: var(--orange);
  box-shadow: 9px 9px 0 var(--ink);
  transform: translate(-2px, -2px);
}

.page-about .about-path__tag {
  align-self: flex-start;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--night);
  background: var(--sand);
}

.page-about .about-path__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  line-height: 1.2;
  color: var(--white);
}

.page-about .about-path p {
  margin: 0;
  flex: 1 1 auto;
  font-size: 14.5px;
  color: var(--grey);
}

.page-about .about-path .btn {
  align-self: flex-start;
  margin-top: 4px;
}

.page-about .about-collab__foot {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  margin-top: 32px;
  padding: 20px 0 0;
  border-top: 3px solid var(--plateau);
}

.page-about .about-collab__foot p {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  color: var(--mist);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-collab__foot {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 34px 0 62px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .chapter {
    padding: 70px 0 76px;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 42px;
  }

  .page-about .about-cap {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-team__roles {
    gap: 18px;
  }

  .page-about .about-paths {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-timeline__item {
    padding-left: 34px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__title {
    max-width: 16ch;
  }

  .page-about .about-timeline__meter {
    max-width: 420px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }

  .page-about .about-step:hover,
  .page-about .about-step:focus-within,
  .page-about .about-eco__item:hover,
  .page-about .about-eco__item:focus-within,
  .page-about .about-path:hover,
  .page-about .about-path:focus-within {
    transform: none;
  }
}

.page-about {
  --fill: currentColor;
}