.page-about {
  --about-gap: clamp(20px, 3vw, 36px);
  --about-num-outline: rgba(138, 59, 255, .75);
  color: var(--pg-paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(34px, 6vw, 76px) 0 clamp(34px, 5vw, 60px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -25% -10% auto -10%;
  height: 130%;
  background:
    radial-gradient(58% 48% at 16% 6%, rgba(138, 59, 255, .34), transparent 72%),
    radial-gradient(46% 44% at 88% 20%, rgba(47, 123, 255, .24), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -6%;
  right: -6%;
  top: 44%;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(37, 245, 208, .7) 28%, rgba(138, 59, 255, .9) 62%, transparent);
  opacity: .65;
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-family: var(--pg-font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--pg-cyan);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--pg-font-head);
  font-weight: 900;
  font-size: clamp(33px, 7.2vw, 64px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--pg-paper);
  text-shadow: 0 0 46px rgba(138, 59, 255, .45);
  max-width: 14em;
}

.page-about .about-hero__lead {
  margin: 0 0 32px;
  max-width: 42em;
  font-family: var(--pg-font-body);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: var(--pg-muted);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .pg-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 15px 16px;
  border: 1px solid var(--pg-line);
  border-radius: var(--pg-radius-m);
  background: linear-gradient(180deg, rgba(16, 21, 40, .92), rgba(7, 6, 11, .72));
}

.page-about .pg-stat__value {
  font-family: var(--pg-font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--pg-violet);
}

.page-about .pg-stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--pg-muted);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  padding: clamp(30px, 5vw, 66px) 0 clamp(48px, 7vw, 92px);
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  row-gap: 28px;
}

.page-about .about-rail,
.page-about .about-main,
.page-about .about-notes {
  min-width: 0;
}

/* ---------- 左栏目录 ---------- */
.page-about .about-toc {
  padding: 16px;
  border: 1px solid var(--pg-line);
  border-radius: var(--pg-radius-m);
  background: rgba(16, 21, 40, .58);
}

.page-about .pg-toc__title {
  margin: 0 0 12px;
  font-family: var(--pg-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--pg-cyan);
}

.page-about .pg-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
}

.page-about .pg-toc__link {
  display: block;
  padding: 9px 11px;
  border-radius: var(--pg-radius-s);
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.5;
  color: var(--pg-muted);
  text-decoration: none;
  transition: color .18s var(--pg-ease), background-color .18s var(--pg-ease), border-color .18s var(--pg-ease);
}

.page-about .pg-toc__link:hover,
.page-about .pg-toc__link:focus-visible {
  color: var(--pg-paper);
  background: rgba(138, 59, 255, .16);
}

.page-about .pg-toc__link[aria-current="true"] {
  color: var(--pg-cyan);
  border-left-color: var(--pg-cyan);
  background: rgba(37, 245, 208, .08);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(22px, 3.4vw, 34px) 0 clamp(30px, 4.6vw, 50px);
  border-top: 1px solid var(--pg-line);
  scroll-margin-top: calc(var(--pg-header-h) + 22px);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .pg-chapter__num {
  margin: 0 0 8px;
  font-family: var(--pg-font-mono);
  font-size: clamp(32px, 5.2vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: transparent;
  -webkit-text-stroke: 1.4px var(--about-num-outline);
}

.page-about .pg-chapter__title {
  margin: 0 0 14px;
  font-family: var(--pg-font-head);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--pg-paper);
}

.page-about .pg-chapter__lead {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.88;
  color: var(--pg-muted);
}

.page-about .pg-prose p {
  margin: 0 0 16px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.88;
  color: var(--pg-muted);
}

.page-about .pg-prose a,
.page-about .pg-chapter__lead a,
.page-about .about-tl__text a {
  color: var(--pg-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 123, 255, .45);
}

.page-about .pg-prose a:hover,
.page-about .pg-chapter__lead a:hover,
.page-about .about-tl__text a:hover {
  color: var(--pg-cyan);
  border-bottom-color: var(--pg-cyan);
}

/* ---------- 内容主张 ---------- */
.page-about .about-claims {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-claim {
  position: relative;
  padding: 16px 18px 16px 22px;
  border: 1px solid var(--pg-line);
  border-radius: var(--pg-radius-m);
  background: rgba(16, 21, 40, .66);
}

.page-about .about-claim::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--pg-violet), var(--pg-blue));
}

.page-about .about-claim p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.84;
  color: var(--pg-muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 24px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--pg-violet), var(--pg-blue) 58%, transparent);
}

.page-about .about-tl {
  position: relative;
  padding: 0 0 24px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--pg-ink);
  border: 2px solid var(--pg-cyan);
  box-shadow: 0 0 0 4px rgba(37, 245, 208, .12);
  transition: border-color .2s var(--pg-ease), box-shadow .2s var(--pg-ease);
}

.page-about .about-tl:hover::before,
.page-about .about-tl:focus-within::before {
  border-color: var(--pg-blue);
  box-shadow: 0 0 0 6px rgba(47, 123, 255, .18);
}

.page-about .about-tl__time {
  margin: 0 0 6px;
  font-family: var(--pg-font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--pg-cyan);
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-family: var(--pg-font-head);
  font-weight: 800;
  font-size: clamp(18px, 2.3vw, 21px);
  line-height: 1.32;
  color: var(--pg-paper);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.84;
  color: var(--pg-muted);
}

.page-about .about-tl__more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13.5px;
  line-height: 1.72;
  color: #AFC4E8;
  transition: max-height .24s var(--pg-ease), opacity .24s var(--pg-ease), margin-top .24s var(--pg-ease);
}

.page-about .about-tl:hover .about-tl__more,
.page-about .about-tl:focus-within .about-tl__more {
  max-height: 160px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 图片位 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3.4vw, 32px) 0 0;
}

.page-about .pg-figure__media {
  border-radius: var(--pg-radius-m);
  overflow: hidden;
  border: 1px solid var(--pg-line);
  background: var(--pg-ink-2);
}

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

.page-about .pg-figure__caption {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--pg-muted);
}

/* ---------- 团队 ---------- */
.page-about .about-crew {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-crew__item {
  padding: 18px;
  border: 1px solid var(--pg-line);
  border-radius: var(--pg-radius-m);
  background: linear-gradient(140deg, rgba(90, 43, 196, .16), rgba(16, 21, 40, .72));
}

.page-about .about-crew__name {
  margin: 0 0 8px;
  font-family: var(--pg-font-head);
  font-weight: 800;
  font-size: 18px;
  color: var(--pg-paper);
}

.page-about .about-crew__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.84;
  color: var(--pg-muted);
}

/* ---------- 收录标准 ---------- */
.page-about .about-faq {
  margin: 22px 0 0;
  display: grid;
  gap: 10px;
}

.page-about .about-faq .pg-faq__item {
  border: 1px solid var(--pg-line);
  border-radius: var(--pg-radius-m);
  background: rgba(16, 21, 40, .62);
  overflow: hidden;
}

.page-about .about-faq .pg-faq__q {
  list-style: none;
  cursor: pointer;
  padding: 15px 16px;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--pg-paper);
  transition: color .18s var(--pg-ease), background-color .18s var(--pg-ease);
}

.page-about .about-faq .pg-faq__q::-webkit-details-marker {
  display: none;
}

.page-about .about-faq .pg-faq__q::marker {
  content: "";
}

.page-about .about-faq .pg-faq__q:hover {
  color: var(--pg-cyan);
  background: rgba(37, 245, 208, .06);
}

.page-about .about-faq .pg-faq__a {
  padding: 0 16px 16px;
}

.page-about .about-faq .pg-faq__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.84;
  color: var(--pg-muted);
}

/* ---------- 服务流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-steps .pg-step {
  padding: 16px 18px;
  border: 1px solid var(--pg-line);
  border-radius: var(--pg-radius-m);
  background: rgba(16, 21, 40, .62);
}

.page-about .about-steps .pg-step__num {
  margin: 0 0 8px;
  font-family: var(--pg-font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--pg-violet);
}

.page-about .about-steps .pg-step__title {
  margin: 0 0 6px;
  font-family: var(--pg-font-head);
  font-weight: 800;
  font-size: 17px;
  color: var(--pg-paper);
}

.page-about .about-steps .pg-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--pg-muted);
}

.page-about .about-cta {
  margin-top: 24px;
  padding: 20px 22px;
  border: 1px solid rgba(255, 194, 75, .32);
  border-radius: var(--pg-radius-l);
  background: linear-gradient(135deg, rgba(255, 194, 75, .12), rgba(138, 59, 255, .16));
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
}

.page-about .about-cta__text {
  margin: 0;
  flex: 1 1 260px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--pg-paper);
}

.page-about .about-cta__text .pg-num {
  font-family: var(--pg-font-mono);
  color: var(--pg-gold);
}

/* ---------- 右栏旁注 ---------- */
.page-about .about-notes {
  display: grid;
  gap: 14px;
}

.page-about .about-sticky {
  display: grid;
  gap: 14px;
}

.page-about .about-note-card {
  padding: 18px;
  border: 1px solid var(--pg-line);
  border-radius: var(--pg-radius-m);
  background: rgba(16, 21, 40, .64);
}

.page-about .about-note-card--gold {
  border-color: rgba(255, 194, 75, .34);
  background: linear-gradient(150deg, rgba(255, 194, 75, .12), rgba(16, 21, 40, .7));
}

.page-about .about-note-card__title {
  margin: 0 0 12px;
  font-family: var(--pg-font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--pg-cyan);
}

.page-about .about-note-card--gold .about-note-card__title {
  color: var(--pg-gold);
}

.page-about .about-note-card__text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--pg-muted);
}

.page-about .about-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-links a {
  display: block;
  padding: 9px 10px;
  border-radius: var(--pg-radius-s);
  font-size: 14.5px;
  color: var(--pg-paper);
  text-decoration: none;
  border-left: 2px solid var(--pg-line);
  transition: color .18s var(--pg-ease), border-color .18s var(--pg-ease), background-color .18s var(--pg-ease);
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  color: var(--pg-cyan);
  border-left-color: var(--pg-cyan);
  background: rgba(37, 245, 208, .07);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .pg-toc__list {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .page-about .about-crew__item:first-child {
    grid-column: 1 / -1;
  }

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

@media (min-width: 960px) {
  .page-about .about-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--about-gap);
    row-gap: 0;
    align-items: start;
  }

  .page-about .about-rail {
    grid-column: span 3;
  }

  .page-about .about-main {
    grid-column: span 6;
  }

  .page-about .about-notes {
    grid-column: span 3;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--pg-header-h) + 18px);
  }

  .page-about .about-sticky {
    position: sticky;
    top: calc(var(--pg-header-h) + 18px);
  }

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

  .page-about .about-crew__item:first-child {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__more {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
    transition: none;
  }

  .page-about .pg-toc__link,
  .page-about .about-links a,
  .page-about .about-tl::before,
  .page-about .about-faq .pg-faq__q {
    transition: none;
  }
}