.page-about {
  --about-soft: rgba(18, 16, 15, .64);
  --about-soft-inv: rgba(245, 239, 228, .74);
  --about-line: rgba(18, 16, 15, .13);
  --about-line-inv: rgba(245, 239, 228, .15);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 顶部印刷细带 ---------- */
.page-about .about-band {
  background: var(--ink);
  border-bottom: 3px solid var(--flame);
}

.page-about .about-band__inner {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  padding-top: 9px;
  padding-bottom: 9px;
  font-size: 12px;
  letter-spacing: .08em;
  flex-wrap: wrap;
}

.page-about .about-band__mark {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  background: var(--flame);
  transform: rotate(45deg);
}

.page-about .about-band__label {
  font-family: var(--font-mono);
  color: var(--amber);
}

.page-about .about-band__sep {
  flex: 1 1 40px;
  height: 1px;
  min-width: 24px;
  background: rgba(245, 239, 228, .18);
}

.page-about .about-band__meta {
  color: rgba(245, 239, 228, .7);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: 44px;
  padding-bottom: 72px;
  background: var(--paper);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -70px;
  right: -18%;
  width: 62%;
  height: 340px;
  background: linear-gradient(135deg, var(--flame), var(--clay));
  transform: skewY(-7deg);
  opacity: .1;
  pointer-events: none;
}

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

.page-about .about-crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 34px;
  font-size: 13px;
  color: var(--about-soft);
}

.page-about .about-crumb a {
  color: var(--about-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.page-about .about-crumb a:hover {
  color: var(--flame);
  border-bottom-color: var(--flame);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
}

.page-about .about-hero__title {
  margin: 14px 0 20px;
  line-height: 1.1;
}

.page-about .about-hero__intro {
  max-width: 34em;
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  padding: 0;
  overflow: hidden;
  border-top: 4px solid var(--flame);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 18px;
  border-right: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-stat:nth-child(2n) {
  border-right: 0;
}

.page-about .about-stat:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.page-about .about-stat__k {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--about-soft);
}

.page-about .about-hero__note {
  margin: 16px 0 0;
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: .04em;
  color: var(--about-soft);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  position: relative;
  overflow: hidden;
}

.page-about .about-origin .wrap {
  position: relative;
}

.page-about .about-origin__ghost {
  margin: 0 0 -.28em;
  font-family: var(--font-mono);
  font-size: clamp(76px, 17vw, 176px);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.05em;
  color: rgba(226, 69, 42, .1);
  pointer-events: none;
  -webkit-user-select: none;
  user-select: none;
}

.page-about .about-origin__tag {
  display: none;
  position: absolute;
  top: 6px;
  right: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .32em;
  color: rgba(18, 16, 15, .32);
}

.page-about .about-origin__grid {
  position: relative;
  gap: 40px;
}

.page-about .about-origin__text h2 {
  margin: 12px 0 18px;
}

.page-about .about-origin__text p + p {
  margin-top: 16px;
}

.page-about .about-origin__aside {
  align-self: end;
}

/* ---------- 通栏章节头 ---------- */
.page-about .about-head {
  max-width: 46em;
  margin-bottom: 44px;
}

.page-about .about-head h2 {
  margin: 12px 0 0;
}

.page-about .about-head__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-soft);
  max-width: 34em;
}

.page-about .about-head--inv .about-head__lede {
  color: var(--about-soft-inv);
}

/* ---------- 五步工作流 ---------- */
.page-about .about-flow {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin: 0 0 52px;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__step {
  position: relative;
  padding-right: 12px;
}

.page-about .about-flow__chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  width: 48px;
  height: 48px;
  background: var(--ink);
  color: var(--paper);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  transition: background .2s ease, transform .2s ease;
}

.page-about .about-flow__step:hover .about-flow__chip {
  background: var(--flame);
  transform: translateY(-3px);
}

.page-about .about-flow__t {
  margin: 16px 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-flow__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-soft);
}

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

/* ---------- 编制堆叠条 ---------- */
.page-about .about-roster {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-roster__row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "name count"
    "bar bar"
    "desc desc";
  gap: 10px 14px;
  align-items: center;
  padding: 20px 8px;
  border-bottom: 1px solid var(--about-line);
  transition: background .2s ease;
}

.page-about .about-roster__row:hover {
  background: rgba(226, 69, 42, .05);
}

.page-about .about-roster__name {
  grid-area: name;
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-roster__count {
  grid-area: count;
  font-size: 24px;
  font-weight: 700;
  color: var(--clay);
}

.page-about .about-roster__bar {
  grid-area: bar;
  display: block;
  height: 10px;
  background: rgba(18, 16, 15, .07);
  overflow: hidden;
}

.page-about .about-roster__bar i {
  display: block;
  width: var(--w, 100%);
  height: 100%;
  background: var(--c, var(--flame));
}

.page-about .about-roster__desc {
  grid-area: desc;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-soft);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0 0 52px;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: rgba(198, 205, 212, .34);
}

.page-about .about-node {
  position: relative;
  border-bottom: 1px solid var(--about-line-inv);
}

.page-about .about-node > summary {
  display: grid;
  grid-template-columns: 62px 1fr auto;
  gap: 12px;
  align-items: center;
  position: relative;
  padding: 22px 0 22px 30px;
  cursor: pointer;
  list-style: none;
  transition: color .2s ease;
}

.page-about .about-node > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node > summary::marker {
  content: "";
}

.page-about .about-node > summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 14px;
  height: 14px;
  margin-top: -7px;
  border-radius: 50%;
  background: var(--flame);
  box-shadow: 0 0 0 4px var(--stone);
  z-index: 1;
  transition: transform .2s ease;
}

.page-about .about-node[open] > summary::before {
  transform: scale(1.28);
}

.page-about .about-node > summary::after {
  content: "展开";
  justify-self: end;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--silver);
  border: 1px solid rgba(198, 205, 212, .42);
  border-radius: 2px;
  padding: 4px 10px;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-node[open] > summary::after {
  content: "收起";
  color: var(--flame);
  border-color: var(--flame);
}

.page-about .about-node__ver {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--amber);
}

.page-about .about-node__title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-node__meta {
  display: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(198, 205, 212, .7);
  padding-right: 12px;
}

.page-about .about-node__body {
  max-width: 62ch;
  padding: 0 0 26px 30px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-soft-inv);
}

.page-about .about-node__body p {
  margin: 0;
}

.page-about .about-node__body ul {
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-node__body li {
  position: relative;
  padding-left: 18px;
}

.page-about .about-node__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 1px;
  background: var(--flame);
}

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

/* ---------- 数据来源 ---------- */
.page-about .about-source__grid {
  gap: 40px;
}

.page-about .about-source__text h2 {
  margin: 12px 0 18px;
}

.page-about .about-source__text .prose + .prose {
  margin-top: 16px;
}

.page-about .about-fields {
  display: grid;
  gap: 2px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-fields li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--paper);
  transition: background .2s ease;
}

.page-about .about-fields li:hover {
  background: var(--paper);
  box-shadow: inset 3px 0 0 var(--flame);
}

.page-about .about-fields__t {
  font-size: 14px;
  line-height: 1.65;
  color: var(--about-soft);
}

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

/* ---------- 时间标准 ---------- */
.page-about .about-promise__grid {
  gap: 20px;
}

.page-about .about-mark {
  padding: 26px 22px 28px;
  border: 1px solid var(--about-line-inv);
  border-left: 3px solid var(--flame);
  background: rgba(245, 239, 228, .04);
  transition: border-color .2s ease, background .2s ease;
}

.page-about .about-mark:hover {
  border-left-color: var(--amber);
  background: rgba(245, 239, 228, .07);
}

.page-about .about-mark__label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--silver);
}

.page-about .about-mark__val {
  margin: 0 0 14px;
  font-size: clamp(34px, 7vw, 48px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-mark__val small {
  margin-left: 8px;
  font-family: var(--font-body);
  font-size: .34em;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--amber);
}

.page-about .about-mark__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft-inv);
}

.page-about .about-promise__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 44px;
  padding-top: 26px;
  border-top: 1px solid var(--about-line-inv);
}

.page-about .about-promise__foot p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-soft-inv);
}

/* ---------- 页尾去向 ---------- */
.page-about .about-next {
  padding: 40px 0 56px;
  background: var(--paper);
}

.page-about .about-next__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: 26px;
  border-top: 3px solid var(--ink);
}

.page-about .about-next__lead {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.72;
  color: var(--about-soft);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(5, 1fr);
    gap: 0;
  }

  .page-about .about-flow::before {
    content: "";
    position: absolute;
    top: 24px;
    left: 10%;
    right: 10%;
    height: 1px;
    background: var(--ember);
    opacity: .32;
  }

  .page-about .about-flow__step {
    padding: 0 16px;
  }

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

  .page-about .about-roster__row {
    grid-template-columns: 150px 56px minmax(0, 1fr) minmax(0, 1.35fr);
    grid-template-areas: "name count bar desc";
    gap: 22px;
    padding: 20px 14px;
  }

  .page-about .about-roster__count {
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 56px;
    padding-bottom: 96px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-hero__side {
    margin-top: 34px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-origin__tag {
    display: block;
  }

  .page-about .about-source__grid {
    align-items: start;
    gap: 56px;
  }
}
<<<END>>>

.page-about {
  --c: transparent;
  --w: 1rem;
}