.page-about {
  --about-rail-w: 196px;
  --about-gap: 56px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 46px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(158deg, var(--ink) 0%, var(--ink) 60%, var(--ink-deep) 60%, var(--ink-deep) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -70px;
  top: -50px;
  width: 280px;
  height: 280px;
  border: 1px solid var(--line-strong);
  transform: rotate(20deg);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 22px;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-size: 30px;
  line-height: 1.2;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__stats li {
  padding: 15px 16px 17px;
  background: rgba(8, 31, 27, .74);
}

.page-about .about-hero__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.15;
  letter-spacing: .02em;
  color: var(--gold-soft);
}

.page-about .about-hero__stat-label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding: 34px 0 68px;
  align-items: start;
}

/* ---------- 左侧时间轴 ---------- */
.page-about .about-rail__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-rail__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-rail__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 7px;
  bottom: 7px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(201, 162, 75, .12) 100%);
}

.page-about .about-rail__list li + li {
  margin-top: 16px;
}

.page-about .about-rail__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 4px 6px;
  text-decoration: none;
  border-radius: var(--radius);
  transition: background-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 7px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--felt);
  border: 2px solid var(--gold);
  transition: background-color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--jade);
}

.page-about .about-rail__label {
  font-size: 14px;
  color: var(--text-dim);
  transition: color .18s var(--ease);
}

.page-about .about-rail__link:hover .about-rail__label {
  color: var(--paper);
}

.page-about .about-rail__link[aria-current="location"] .about-rail__label {
  color: var(--cyan);
}

.page-about .about-rail__link[aria-current="location"]::before {
  background: var(--cyan);
  border-color: var(--cyan);
  transform: scale(1.25);
}

.page-about .about-rail__link[aria-current="location"] {
  background: rgba(53, 224, 200, .08);
}

/* ---------- 右侧正文 ---------- */
.page-about .about-main {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: 96px;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-chapter__idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: 21px;
  line-height: 1.35;
  letter-spacing: .015em;
  color: var(--paper);
}

.page-about .about-chapter__lede {
  margin: 0 0 22px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-chapter__link {
  margin: 24px 0 0;
}

/* ---------- 01 三条主线 ---------- */
.page-about .about-lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-line {
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--gold);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(18, 59, 51, .9) 0%, rgba(11, 43, 38, .9) 100%);
  box-shadow: var(--shadow-1);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-line:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .about-line:nth-child(3) {
  border-top-color: var(--orange);
}

.page-about .about-line__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--gold-soft);
}

.page-about .about-line:nth-child(2) .about-line__kicker {
  color: var(--cyan);
}

.page-about .about-line:nth-child(3) .about-line__kicker {
  color: var(--orange);
}

.page-about .about-line__title {
  margin: 10px 0 10px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-line__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 02 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.page-about .about-team__roles {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-team__role {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
  border-radius: var(--radius);
  background: rgba(8, 31, 27, .5);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--gold-soft);
}

.page-about .about-team__role-title {
  margin: 0 0 6px;
  font-size: 15px;
  color: var(--paper);
}

.page-about .about-team__role-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-team__note {
  margin: 20px 0 0;
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  background: rgba(16, 21, 18, .38);
}

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

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

/* ---------- 03 演进阶段 ---------- */
.page-about .about-stages {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

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

.page-about .about-stages__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  counter-reset: stage;
}

.page-about .about-stage {
  position: relative;
  padding: 18px 18px 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(18, 59, 51, .62);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  background: var(--gold);
  border-radius: 2px;
}

.page-about .about-stage:nth-child(2)::before {
  background: var(--cyan);
}

.page-about .about-stage:nth-child(3)::before {
  background: var(--orange);
}

.page-about .about-stage__tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .about-stage__title {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-stage p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 04 编纂流程 ---------- */
.page-about .about-flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(18, 59, 51, .86), rgba(11, 43, 38, .86));
}

.page-about .about-flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .about-flow__title {
  margin: 8px 0 8px;
  font-size: 16px;
  color: var(--paper);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-flow__figure {
  margin: 24px 0 0;
  max-width: 420px;
}

.page-about .about-folds {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-fold {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(16, 21, 18, .42);
  overflow: hidden;
}

.page-about .about-fold__summary {
  position: relative;
  padding: 14px 44px 14px 16px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
  transition: background-color .18s var(--ease);
}

.page-about .about-fold__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-fold__summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--gold);
  transition: transform .2s var(--ease);
}

.page-about .about-fold[open] .about-fold__summary::after {
  content: "−";
}

.page-about .about-fold__summary:hover {
  background: rgba(201, 162, 75, .08);
}

.page-about .about-fold__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-fold__body p {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 05 更新节奏 ---------- */
.page-about .about-updates {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-update {
  padding: 20px 18px 22px;
  border-radius: var(--radius);
}

.page-about .about-update--paper {
  background: var(--paper);
  border: 1px solid rgba(16, 21, 18, .16);
  box-shadow: var(--shadow-1);
}

.page-about .about-update--paper .about-update__title {
  color: var(--char);
}

.page-about .about-update--paper p {
  color: rgba(16, 21, 18, .74);
}

.page-about .about-update--outline {
  border: 1px dashed var(--line-strong);
  background: rgba(18, 59, 51, .42);
}

.page-about .about-update--outline .about-update__title {
  color: var(--paper);
}

.page-about .about-update--outline p {
  color: var(--text-dim);
}

.page-about .about-update__title {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.4;
}

.page-about .about-update p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
}

/* ---------- 06 使用人群 ---------- */
.page-about .about-audience {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-audience li {
  position: relative;
  padding: 18px 18px 18px 46px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(8, 31, 27, .52);
}

.page-about .about-audience li::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 22px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--gold);
  border-radius: 2px;
  transform: rotate(45deg);
}

.page-about .about-audience li:nth-child(2)::before {
  border-color: var(--cyan);
}

.page-about .about-audience li:nth-child(3)::before {
  border-color: var(--orange);
}

.page-about .about-audience h3 {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-audience p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 32px 0 54px;
  }

  .page-about .about-hero__title {
    font-size: 40px;
  }

  .page-about .about-hero__lede {
    font-size: 16px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__stat-num {
    font-size: 24px;
  }

  .page-about .about-chapter__title {
    font-size: 24px;
  }

  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-updates {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 860px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 32px;
  }

  .page-about .about-stages {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 28px;
  }

  .page-about .about-stage {
    padding: 20px 20px 20px 26px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__title {
    font-size: 52px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 48px;
    padding: 44px 0 84px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-flow__step::after {
    content: "";
    position: absolute;
    top: 26px;
    left: 100%;
    width: 20px;
    height: 2px;
    background: var(--line-strong);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-rail__link::before,
  .page-about .about-rail__label,
  .page-about .about-fold__summary,
  .page-about .about-fold__summary::after {
    transition: none;
  }
}
</｜｜DSML｜｜ parameter>
</｜｜DSML｜｜ invoke>
</｜｜DSML｜｜ calls>