.page-about {
  --about-rule: rgba(35, 29, 24, .16);
  --about-rule-dark: rgba(152, 166, 203, .26);
  --about-muted: rgba(35, 29, 24, .66);
  --about-violet: #6E2BB8;
  --about-magenta: #C42C6B;
  background: var(--ink-900);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.about-hero {
  position: relative;
  padding: 28px 0 52px;
  background:
    radial-gradient(120% 90% at 88% 6%, rgba(196, 44, 107, .34) 0%, rgba(110, 43, 184, .18) 38%, transparent 68%),
    var(--ink-900);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(38, 53, 110, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(38, 53, 110, .55) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 78%);
  pointer-events: none;
}

.about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.about-crumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mist);
}

.about-crumbs a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease);
}

.about-crumbs a:hover { border-bottom-color: currentColor; }

.about-crumbs__sep { color: var(--line); }

.about-hero__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .24em;
  color: var(--orange);
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-sans);
  font-size: clamp(2rem, 7vw, 3.4rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.02em;
  color: #FFFFFF;
}

.about-hero__lede {
  margin: 0;
  max-width: 36em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.about-hero__stat {
  display: grid;
  gap: 4px;
  padding: 16px 14px;
  background: var(--ink-800);
}

.about-hero__stat-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--cyan);
}

.about-hero__stat:nth-child(2) .about-hero__stat-num,
.about-hero__stat:nth-child(4) .about-hero__stat-num { color: var(--orange); }

.about-hero__stat-label {
  font-size: .78rem;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 纸面主体 ---------- */
.about-body {
  padding: 36px 0 60px;
  background: var(--paper);
  color: var(--paper-ink);
}

.about-body__grid {
  display: grid;
  gap: 26px;
}

.about-toc { display: none; }

.about-flow {
  display: grid;
  gap: 6px;
  min-width: 0;
}

/* ---------- 章节骨架 ---------- */
.about-section {
  padding: 30px 0;
  border-top: 1px solid var(--about-rule);
}

.about-section:first-child {
  padding-top: 6px;
  border-top: 0;
}

.about-section[id] { scroll-margin-top: 28px; }

.about-sec-head { margin-bottom: 16px; }

.about-sec-head__num {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .2em;
  color: var(--about-magenta);
}

.page-about .about-sec-head__title {
  margin: 0;
  font-size: clamp(1.3rem, 4.4vw, 1.9rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.015em;
  color: var(--paper-ink);
}

.about-flow :where(p) {
  margin: 0 0 14px;
  font-size: .95rem;
  line-height: 1.8;
}

.about-flow :where(p):last-child { margin-bottom: 0; }

.about-lead {
  font-size: 1.02rem !important;
  font-weight: 600;
  line-height: 1.75 !important;
  color: var(--paper-ink);
}

/* ---------- 深色分区 ---------- */
.about-section--dark {
  padding: 30px 22px;
  border-top: 0;
  border-radius: var(--radius);
  background: var(--ink-900);
  color: var(--text);
  box-shadow: var(--shadow);
}

.about-section--dark .about-sec-head__title { color: #FFFFFF; }
.about-section--dark .about-sec-head__num { color: var(--cyan); }
.about-section--dark .about-lead { color: var(--text); }
.about-section--dark :where(p) { color: var(--text-dim); }

/* ---------- 三段动作 ---------- */
.about-steps {
  display: grid;
  gap: 1px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-rule);
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.about-steps__item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 12px;
  padding: 15px 0;
  background: var(--paper);
}

.about-steps__num {
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--about-magenta);
}

.about-steps__title {
  margin: 0 0 4px;
  font-size: .98rem;
  font-weight: 700;
  letter-spacing: -.005em;
  color: var(--paper-ink);
}

.about-steps__text {
  margin: 0 !important;
  font-size: .9rem !important;
  line-height: 1.75 !important;
  color: var(--about-muted);
}

/* ---------- 图片 ---------- */
.about-shot { margin: 0 0 20px; }

.about-shot__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--panel), var(--ink-900));
}

.about-section--dark .about-shot__img { border-color: var(--line); }

.about-shot__cap {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: .72rem;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--about-muted);
}

.about-section--dark .about-shot__cap { color: var(--mist); }

/* ---------- 双列信息块 ---------- */
.about-grid-2 {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

.about-card {
  padding: 15px 16px 17px;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .45);
}

.about-card__title {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 8px;
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: -.005em;
  color: var(--paper-ink);
}

.about-card__title::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--about-magenta);
  transform: translateY(-2px);
}

.about-card p {
  margin: 0;
  font-size: .89rem;
  line-height: 1.75;
  color: var(--about-muted);
}

.about-section--dark .about-card {
  border-color: var(--line);
  background: var(--ink-800);
}

.about-section--dark .about-card__title { color: #FFFFFF; }
.about-section--dark .about-card__title::before { background: var(--cyan); }
.about-section--dark .about-card p { color: var(--text-dim); }

/* ---------- 六宫格 ---------- */
.about-sports {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.about-sports__item {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 15px 14px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition: transform .25s var(--ease), border-color .25s var(--ease);
}

.about-sports__item::after {
  content: "";
  position: absolute;
  right: -30%;
  bottom: -62%;
  width: 92px;
  height: 92px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(53, 217, 206, .32), transparent 70%);
  pointer-events: none;
}

.about-sports__item:hover {
  transform: translateY(-3px);
  border-color: var(--cyan);
}

.about-sports__num {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .14em;
  color: var(--cyan);
}

.about-sports__name {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -.01em;
  color: #FFFFFF;
}

.about-sports__meta {
  font-size: .75rem;
  line-height: 1.6;
  color: var(--mist);
}

.about-after {
  margin-top: 16px !important;
  font-size: .9rem !important;
  line-height: 1.8 !important;
  color: var(--about-muted);
}

/* ---------- 版本节点 ---------- */
.about-versions {
  display: grid;
  gap: 1px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--line);
}

.about-versions__item {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 17px 16px;
  background: var(--ink-800);
}

.about-versions__ver {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--orange);
}

.about-versions__item:nth-child(4) .about-versions__ver { color: var(--cyan); }

.about-versions__stage {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--mist);
}

.about-versions__item p {
  margin: 0;
  font-size: .86rem;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 团队筛选 ---------- */
.about-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 20px 0 16px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--about-rule);
}

.about-chip {
  appearance: none;
  padding: 6px 14px;
  border: 1px solid var(--about-rule);
  border-radius: 999px;
  background: transparent;
  font-family: var(--font-sans);
  font-size: .8rem;
  color: var(--paper-ink);
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.about-chip:hover {
  border-color: var(--about-magenta);
  color: var(--about-magenta);
}

.about-chip[aria-pressed="true"] {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: #FFFFFF;
}

.about-filter__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--about-muted);
}

.about-filter__count span {
  font-weight: 700;
  color: var(--about-magenta);
}

.about-team {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.about-team__item {
  padding: 14px 16px;
  border: 1px solid var(--about-rule);
  border-left: 3px solid var(--about-magenta);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .5);
}

.about-team__item[hidden],
.about-team__item.is-hidden { display: none; }

.about-team__tag {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .14em;
  color: var(--about-muted);
}

.about-team__role {
  margin: 0 0 6px;
  font-size: .98rem;
  font-weight: 700;
  letter-spacing: -.005em;
  color: var(--paper-ink);
}

.about-team__desc {
  margin: 0;
  font-size: .87rem;
  line-height: 1.75;
  color: var(--about-muted);
}

/* ---------- 用户分布 ---------- */
.about-reach {
  display: grid;
  gap: 20px;
  margin-top: 18px;
}

.about-reach .about-shot { margin-bottom: 0; }

.about-reach__body p {
  margin: 0 0 14px !important;
  font-size: .95rem !important;
  line-height: 1.8 !important;
  color: var(--about-muted);
}

.about-facts {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.about-facts li {
  position: relative;
  padding-left: 20px;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--about-muted);
}

.about-facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .58em;
  width: 8px;
  height: 8px;
  border: 2px solid var(--about-magenta);
  border-radius: 50%;
}

/* ---------- 收口 ---------- */
.about-section--cta {
  padding: 30px 0 6px;
  border-top: 0;
}

.about-cta {
  position: relative;
  overflow: hidden;
  padding: 26px 22px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background:
    linear-gradient(128deg, rgba(110, 43, 184, .55) 0%, rgba(10, 19, 48, .96) 52%, rgba(196, 44, 107, .42) 100%),
    var(--ink-900);
}

.about-cta::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, rgba(255, 255, 255, .06) 1px, transparent 1px);
  background-size: 56px 100%;
  pointer-events: none;
}

.about-cta__kicker {
  margin: 0 0 10px !important;
  font-family: var(--font-mono);
  font-size: .68rem !important;
  letter-spacing: .22em;
  color: var(--cyan) !important;
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(1.25rem, 4.4vw, 1.7rem);
  font-weight: 800;
  letter-spacing: -.015em;
  color: #FFFFFF;
}

.about-cta__text {
  position: relative;
  z-index: 1;
  max-width: 40em;
  margin: 0 0 20px !important;
  font-size: .93rem !important;
  line-height: 1.8 !important;
  color: var(--text-dim) !important;
}

.about-cta__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 断点 ---------- */
@media (min-width: 600px) {
  .about-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
  .about-sports { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .about-team { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 760px) {
  .about-versions { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .about-reach { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 28px; align-items: start; }
}

@media (min-width: 900px) {
  .about-hero { padding: 40px 0 68px; }
  .about-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .8fr);
    align-items: end;
    gap: 48px;
  }
  .about-hero__stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .about-body { padding: 48px 0 76px; }
  .about-body__grid {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
  .about-toc {
    display: block;
    position: sticky;
    top: 26px;
    padding-top: 4px;
  }
  .about-toc__title {
    margin: 0 0 12px;
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--about-muted);
  }
  .about-toc__list {
    margin: 0;
    padding: 0;
    list-style: none;
    border-top: 1px solid var(--about-rule);
  }
  .about-toc__item { border-bottom: 1px dashed var(--about-rule); }
  .about-toc__link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 0;
    font-size: .84rem;
    color: var(--paper-ink);
    text-decoration: none;
    transition: color .2s var(--ease), padding-left .2s var(--ease);
  }
  .about-toc__link:hover {
    padding-left: 4px;
    color: var(--about-magenta);
  }
  .about-toc__num {
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .08em;
    color: var(--about-muted);
  }
  .about-toc__note {
    margin: 16px 0 0;
    font-size: .78rem;
    line-height: 1.7;
    color: var(--about-muted);
  }
  .about-section { padding: 40px 0; }
  .about-section--dark { padding: 36px 32px; }
  .about-section--cta { padding: 40px 0 8px; }
  .about-cta { padding: 34px 32px 36px; }
}

@media (max-width: 380px) {
  .about-steps__item { grid-template-columns: 34px minmax(0, 1fr); gap: 8px; }
  .about-hero__stat { padding: 14px 12px; }
  .about-hero__stat-num { font-size: 1.3rem; }
}

@media (max-width: 600px) {
  .about-filter__count {
    margin-left: 0;
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .about-sports__item,
  .about-chip,
  .about-toc__link,
  .about-crumbs a { transition: none; }
  .about-sports__item:hover { transform: none; }
}