.page-about{
  --ab-line: var(--mist);
  --ab-soft-text: rgba(246, 242, 234, .78);
  padding-block: clamp(20px, 3vw, 40px) clamp(56px, 8vw, 104px);
  background: var(--crane);
  color: var(--ink);
  font-family: var(--font-body);
}

.page-about .page-crumb{
  margin-bottom: clamp(16px, 2.4vw, 30px);
}

.page-about .about-frame{
  display: flex;
  flex-direction: column;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-body{
  min-width: 0;
  flex: 1 1 auto;
}

.page-about .about-rail{
  border-top: 3px solid var(--red);
  padding-top: 16px;
}

.page-about .rail-note{
  margin: 8px 0 16px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--warm);
}

.page-about .rail-list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.page-about .rail-link{
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--ab-line);
  text-decoration: none;
  color: var(--warm);
  font-size: .93rem;
  line-height: 1.4;
  transition: color .22s var(--ease), padding-left .22s var(--ease);
}

.page-about .rail-num{
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--teal);
  transition: color .22s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible{
  color: var(--ink);
  padding-left: 4px;
}

.page-about .rail-link:hover .rail-num,
.page-about .rail-link:focus-visible .rail-num{
  color: var(--red);
}

.page-about .rail-cta{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  min-height: 46px;
  padding: 10px 20px;
  border-radius: var(--r-pill);
  background: var(--red);
  color: var(--paper);
  font-size: .9rem;
  letter-spacing: .03em;
  text-decoration: none;
  transition: background .22s var(--ease);
}

.page-about .rail-cta:hover,
.page-about .rail-cta:focus-visible{
  background: var(--wine);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero{
  display: grid;
  gap: clamp(24px, 3vw, 36px);
  align-items: end;
}

.page-about .hero-eyebrow{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--red);
}

.page-about .hero-eyebrow::before{
  content: "";
  display: block;
  width: 26px;
  height: 2px;
  background: var(--red);
}

.page-about .about-title{
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.95rem, 5.4vw, 3.4rem);
  line-height: 1.16;
  letter-spacing: .03em;
  color: var(--ink);
}

.page-about .about-lede{
  margin: 0;
  max-width: 34em;
  font-size: clamp(1rem, .5vw + .92rem, 1.1rem);
  line-height: 1.95;
  color: var(--warm);
}

.page-about .hero-figure{
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--deep);
}

.page-about .hero-figure img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .hero-stats{
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: clamp(18px, 3vw, 26px) 0 0;
  border-top: 1px solid var(--ab-line);
  display: grid;
  gap: 18px 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .hero-stats .stat-value{
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.6vw, 2.05rem);
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--ink);
  line-height: 1.1;
}

.page-about .hero-stats .stat-label{
  display: block;
  margin-top: 5px;
  font-size: .79rem;
  letter-spacing: .05em;
  color: var(--warm);
}

/* ---------- 章节骨架 ---------- */

.page-about .chapter{
  --cn: rgba(179, 38, 30, .22);
  padding-block: clamp(34px, 5vw, 58px);
}

.page-about .chapter--deep{
  --cn: rgba(246, 242, 234, .26);
  background: var(--deep);
  color: var(--crane);
  border-radius: var(--r-lg);
  padding: clamp(26px, 4vw, 56px);
  margin-block: clamp(20px, 3vw, 32px);
}

.page-about .chapter--wine{
  --cn: rgba(246, 242, 234, .26);
  background: var(--wine);
  color: var(--crane);
  border-radius: var(--r-lg);
  padding: clamp(26px, 4vw, 56px);
  margin-block: clamp(20px, 3vw, 32px);
}

.page-about .chapter-head{
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .chapter-num{
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.5rem, 6vw, 4rem);
  line-height: .9;
  letter-spacing: .02em;
  color: var(--cn);
}

.page-about .chapter-title{
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 2.6vw, 1.95rem);
  line-height: 1.28;
  letter-spacing: .03em;
}

.page-about .chapter-lede{
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  max-width: 38em;
  font-size: clamp(.96rem, .35vw + .9rem, 1.06rem);
  line-height: 1.9;
  color: var(--warm);
}

.page-about .chapter--deep .chapter-lede,
.page-about .chapter--deep p,
.page-about .chapter--deep li,
.page-about .chapter--wine .chapter-lede,
.page-about .chapter--wine p,
.page-about .chapter--wine li{
  color: var(--ab-soft-text);
}

.page-about .about-prose p{
  margin: 0 0 1.05em;
  max-width: 36em;
  font-size: .96rem;
  line-height: 1.95;
  color: var(--warm);
}

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

.page-about .entry-list{
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .entry-list li{
  padding-left: 16px;
  border-left: 2px solid var(--red);
  font-size: .92rem;
  line-height: 1.8;
  color: var(--warm);
}

.page-about .entry-list strong{
  display: block;
  margin-bottom: 3px;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: .05em;
}

/* ---------- 六类条目 ---------- */

.page-about .type-grid{
  list-style: none;
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
}

.page-about .type-item{
  border: 1px solid rgba(246, 242, 234, .16);
  border-radius: var(--r-md);
  padding: 15px 15px 18px;
  background: rgba(246, 242, 234, .05);
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .type-item:hover{
  background: rgba(246, 242, 234, .1);
  border-color: rgba(99, 194, 183, .5);
}

.page-about .type-num{
  display: block;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--teal-bright);
}

.page-about .type-name{
  display: block;
  margin: 8px 0 6px;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: .05em;
  color: var(--crane);
}

.page-about .type-desc{
  display: block;
  font-size: .84rem;
  line-height: 1.75;
  color: rgba(246, 242, 234, .72);
}

.page-about .index-split{
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .sub-title{
  margin: 0 0 16px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--crane);
}

.page-about .sub-text{
  margin: 16px 0 0;
  max-width: 34em;
  font-size: .92rem;
  line-height: 1.9;
  color: var(--ab-soft-text);
}

.page-about .sub-text--light{
  margin-top: clamp(20px, 3vw, 28px);
  color: var(--ab-soft-text);
}

.page-about .index-flow{
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.page-about .index-flow li{
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .index-flow li + li::before{
  content: "→";
  color: var(--teal-bright);
  font-family: var(--font-mono);
  font-size: .85rem;
}

.page-about .index-flow .flow-chip{
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 6px 16px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(246, 242, 234, .2);
  background: rgba(246, 242, 234, .09);
  color: var(--crane);
  font-size: .84rem;
  letter-spacing: .05em;
}

.page-about .index-flow .flow-chip--lead{
  background: var(--red);
  border-color: var(--red);
  color: var(--paper);
}

.page-about .index-figure{
  margin: 0;
}

.page-about .index-figure img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md);
}

/* ---------- 审校 ---------- */

.page-about .audit-split{
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .audit-list{
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .audit-item{
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .audit-item:last-child{
  border-bottom: 1px solid var(--ab-line);
}

.page-about .audit-step{
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--teal);
  padding-top: 4px;
}

.page-about .audit-name{
  margin: 0 0 5px;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .audit-desc{
  margin: 0;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--warm);
}

.page-about .audit-figure{
  margin: 0;
}

.page-about .audit-figure img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md);
}

.page-about .audit-figure .media-caption{
  margin-top: 12px;
  font-size: .82rem;
  line-height: 1.75;
  color: var(--warm);
}

/* ---------- 团队 ---------- */

.page-about .team-bars{
  display: grid;
  gap: 20px;
}

.page-about .bar-row{
  display: grid;
  gap: 8px;
}

.page-about .bar-meta{
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-size: .92rem;
  color: var(--crane);
}

.page-about .bar-meta strong{
  font-weight: 700;
  letter-spacing: .04em;
}

.page-about .bar-meta span{
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .04em;
  color: rgba(246, 242, 234, .76);
}

.page-about .bar-track{
  height: 10px;
  border-radius: var(--r-pill);
  background: rgba(246, 242, 234, .16);
  overflow: hidden;
}

.page-about .bar-fill{
  display: block;
  height: 100%;
  border-radius: var(--r-pill);
  background: var(--red-bright);
}

.page-about .partner-grid{
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  margin-top: clamp(24px, 3.4vw, 34px);
}

.page-about .partner-card{
  border: 1px solid rgba(246, 242, 234, .18);
  border-radius: var(--r-md);
  padding: 18px 18px 20px;
}

.page-about .partner-num{
  display: block;
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 600;
  line-height: 1;
  color: var(--crane);
}

.page-about .partner-label{
  display: block;
  margin-top: 8px;
  font-size: .84rem;
  line-height: 1.75;
  color: rgba(246, 242, 234, .76);
}

/* ---------- 四步共建 ---------- */

.page-about .steps{
  display: grid;
  gap: 18px;
}

.page-about .step{
  position: relative;
  border-top: 1px solid var(--ab-line);
  padding-top: 14px;
}

.page-about .step summary{
  list-style: none;
  cursor: pointer;
  display: block;
  padding: 4px 0 6px;
}

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

.page-about .step-dot{
  display: block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--red);
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.page-about .step-name{
  display: block;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .step-name::after{
  content: " +";
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--teal);
}

.page-about .step[open] .step-name::after{
  content: " –";
}

.page-about .step-hint{
  display: block;
  margin-top: 5px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--warm);
}

.page-about .step-body{
  margin-top: 10px;
  padding-top: 12px;
  border-top: 1px dashed var(--ab-line);
}

.page-about .step-body p{
  margin: 0 0 8px;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--warm);
}

.page-about .step-body .step-deliver{
  margin: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--teal);
}

/* ---------- 里程碑 ---------- */

.page-about .timeline{
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item{
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .tl-item:last-child{
  border-bottom: 1px solid var(--ab-line);
}

.page-about .tl-ver{
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--red);
}

.page-about .tl-text{
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--warm);
}

.page-about .tl-text strong{
  color: var(--ink);
  font-weight: 700;
  letter-spacing: .03em;
}

.page-about .tl-link{
  margin: 20px 0 0;
}

.page-about .tl-link .link-arrow{
  display: inline-block;
  color: var(--teal);
  font-size: .92rem;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
  transition: color .22s var(--ease), transform .22s var(--ease);
}

.page-about .tl-link .link-arrow:hover,
.page-about .tl-link .link-arrow:focus-visible{
  color: var(--red);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta{
  margin-top: clamp(28px, 4vw, 48px);
  background: var(--deep);
  color: var(--crane);
  border-radius: var(--r-lg);
  padding: clamp(26px, 4.6vw, 54px);
  display: grid;
  gap: 22px;
}

.page-about .cta-title{
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.25rem, 2.6vw, 1.85rem);
  line-height: 1.3;
  letter-spacing: .04em;
  color: var(--crane);
}

.page-about .cta-text{
  margin: 0;
  max-width: 32em;
  font-size: .94rem;
  line-height: 1.9;
  color: rgba(246, 242, 234, .8);
}

.page-about .cta-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta .btn--ghost{
  border-color: rgba(246, 242, 234, .42);
  color: var(--crane);
}

.page-about .about-cta .btn--ghost:hover,
.page-about .about-cta .btn--ghost:focus-visible{
  border-color: var(--crane);
  background: rgba(246, 242, 234, .1);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px){
  .page-about .hero-stats{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .audit-item{
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 4px 20px;
    align-items: start;
  }

  .page-about .tl-item{
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 4px 20px;
    align-items: start;
  }
}

@media (min-width: 820px){
  .page-about .about-hero{
    grid-template-columns: minmax(0, 1fr) minmax(0, .88fr);
    align-items: end;
  }

  .page-about .index-split{
    grid-template-columns: minmax(0, 1fr) minmax(0, .9fr);
    align-items: center;
  }

  .page-about .audit-split{
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }

  .page-about .about-cta{
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .steps{
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    position: relative;
  }

  .page-about .steps::before{
    content: "";
    position: absolute;
    top: 7px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--teal);
    opacity: .3;
  }

  .page-about .step{
    border-top: 0;
    padding-top: 0;
  }
}

@media (min-width: 920px){
  .page-about .about-frame{
    flex-direction: row;
    align-items: flex-start;
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-rail{
    flex: 0 0 206px;
    position: sticky;
    top: calc(var(--header-h) + 26px);
  }

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

@media (prefers-reduced-motion: reduce){
  .page-about .rail-link,
  .page-about .rail-cta,
  .page-about .type-item,
  .page-about .tl-link .link-arrow{
    transition: none;
  }
}
</main>