.page-about{
  --about-copy: 640px;
  --about-line: 1px solid var(--steel);
  background: var(--ink);
  color: var(--paper);
}

.page-about .inline-link{
  color: var(--lava);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 94, 26, .45);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.page-about .inline-link:hover,
.page-about .inline-link:focus-visible{
  color: var(--ember);
  border-bottom-color: var(--ember);
}
.page-about .inline-link--ink{
  color: #C43E00;
  border-bottom-color: rgba(196, 62, 0, .4);
}
.page-about .inline-link--ink:hover,
.page-about .inline-link--ink:focus-visible{
  color: #8F2D00;
  border-bottom-color: #8F2D00;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  padding: 28px 0 0;
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .045) 0 1px, transparent 1px 80px),
    linear-gradient(180deg, var(--ink) 0%, #101010 100%);
}

.page-about .hero-frame{
  position: relative;
  margin-top: 20px;
  border: var(--about-line);
  background: rgba(22, 22, 22, .74);
  display: grid;
  grid-template-columns: 1fr;
}
.page-about .hero-frame::before{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background: repeating-linear-gradient(90deg, var(--steel) 0 1px, transparent 1px 40px);
  pointer-events: none;
}
.page-about .hero-frame::after{
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 96px;
  height: 96px;
  border-top: 1px solid var(--lava);
  border-left: 1px solid var(--lava);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  background: linear-gradient(135deg, transparent 55%, rgba(255, 94, 26, .16) 100%);
  pointer-events: none;
}

.page-about .hero-rail{ display: none; }

.page-about .hero-body{
  position: relative;
  padding: 32px 20px 36px;
}

.page-about .hero-kicker{
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--lava);
}

.page-about .hero-body h1{
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 7.2vw, 84px);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .hero-lead{
  margin: 24px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.95;
  color: #D6D3CE;
}

.page-about .hero-facts{
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--steel);
  border: var(--about-line);
}
.page-about .fact{
  background: var(--graphite);
  padding: 14px 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-about .fact-num{
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1;
  color: var(--amber);
}
.page-about .fact-key{
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--fog);
}

/* ---------- 斜切色带 ---------- */
.page-about .about-seam{
  height: 12px;
  width: min(420px, 58vw);
  margin: 40px 0 0 var(--rail);
  background: linear-gradient(90deg, var(--lava), var(--ember));
  clip-path: polygon(0 0, 100% 0, calc(100% - 18px) 100%, 0 100%);
}
.page-about .about-seam--right{
  margin-left: auto;
  margin-right: var(--rail);
  width: min(300px, 44vw);
  background: var(--steel);
  clip-path: polygon(18px 0, 100% 0, 100% 100%, 0 100%);
}

/* ---------- 章节通用 ---------- */
.page-about .section{
  padding: 56px 0;
}
.page-about .sec-head{
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 16px;
  padding-top: 14px;
  margin-bottom: 28px;
  border-top: var(--about-line);
}
.page-about .sec-idx{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--lava);
}
.page-about .sec-head h2{
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 5vw, 48px);
  line-height: 1.08;
  letter-spacing: -.015em;
  color: var(--paper);
}
.page-about .sec-note{
  margin-left: auto;
  padding-left: 12px;
  border-left: var(--about-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--fog-dim);
}
.page-about .section-lead{
  margin: 0 0 32px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.9;
  color: #C9C6C1;
}

/* ---------- 01 起源 ---------- */
.page-about .origin-grid{
  display: grid;
  gap: 32px;
}
.page-about .origin-text p{
  margin: 0 0 18px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.95;
  color: #C9C6C1;
}
.page-about .origin-text p:last-child{ margin-bottom: 0; }
.page-about .origin-text .lede{
  font-size: clamp(19px, 2.4vw, 23px);
  line-height: 1.7;
  font-weight: 500;
  color: var(--paper);
  max-width: 26em;
  padding-left: 16px;
  border-left: 3px solid var(--lava);
  margin-bottom: 26px;
}
.page-about .origin-figure{
  margin: 0;
  border: var(--about-line);
  background: var(--graphite);
}
.page-about .origin-figure img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
}
.page-about .origin-figure figcaption,
.page-about .culture-figure figcaption,
.page-about .desk-figure figcaption{
  padding: 10px 12px;
  border-top: var(--about-line);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--fog-dim);
}

/* ---------- 02 编辑台的一天 ---------- */
.page-about .desk-figure{
  margin: 0 0 32px;
  border: var(--about-line);
  background: var(--graphite);
}
.page-about .desk-figure img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .desk-steps{
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--about-line);
}
.page-about .desk-step{
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-bottom: var(--about-line);
  transition: background-color .2s var(--ease);
}
.page-about .desk-step:hover{ background: rgba(255, 94, 26, .05); }
.page-about .step-idx{
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: .1em;
  color: var(--lava);
  padding-top: 3px;
}
.page-about .desk-step h3{
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--paper);
}
.page-about .desk-step p{
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
}

/* ---------- 03 分工 ---------- */
.page-about .crew-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--steel);
  border: var(--about-line);
}
.page-about .crew-card{
  background: var(--graphite);
  padding: 22px 20px 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 2px solid transparent;
  transition: border-top-color .2s var(--ease), background-color .2s var(--ease);
}
.page-about .crew-card:hover{
  border-top-color: var(--lava);
  background: #1B1B1B;
}
.page-about .crew-idx{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--lava);
}
.page-about .crew-card h3{
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}
.page-about .crew-card p{
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fog);
}

/* ---------- 04 时间轴 ---------- */
.page-about .timeline{
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  border-left: 1px solid var(--steel);
}
.page-about .tl-item{
  position: relative;
  border-bottom: var(--about-line);
}
.page-about .tl-item:last-child{ border-bottom: none; }
.page-about .tl-item::before{
  content: "";
  position: absolute;
  left: -34px;
  top: 19px;
  width: 12px;
  height: 12px;
  background: var(--ink);
  border: 1px solid var(--lava);
  pointer-events: none;
}
.page-about .tl-item details{ width: 100%; }
.page-about .tl-item summary{
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding: 14px 0;
}
.page-about .tl-item summary::-webkit-details-marker{ display: none; }
.page-about .tl-item summary:focus-visible{
  outline: 2px solid var(--lava);
  outline-offset: 3px;
}
.page-about .tl-step{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--lava);
}
.page-about .tl-title{
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}
.page-about .tl-plus{
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--fog-dim);
}
.page-about .tl-plus::before{ content: "+"; }
.page-about .tl-item[open] .tl-plus::before{ content: "–"; }
.page-about .tl-item[open] .tl-plus{ color: var(--lava); }
.page-about .tl-body{
  margin: 0;
  padding: 0 0 20px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
}

/* ---------- 05 文化专栏（纸白） ---------- */
.page-about .about-culture{
  position: relative;
  margin-top: 40px;
  padding: 60px 0 64px;
  background: var(--paper);
  color: var(--ink-text);
  overflow: hidden;
}
.page-about .about-culture::before{
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(16, 16, 16, .055) 0 1px, transparent 1px 80px),
    repeating-linear-gradient(0deg, rgba(16, 16, 16, .045) 0 1px, transparent 1px 80px);
  pointer-events: none;
}
.page-about .culture-inner{
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--rail);
}
.page-about .about-culture .sec-head{
  border-top-color: rgba(16, 16, 16, .22);
}
.page-about .about-culture .sec-head h2{ color: var(--ink-text); }
.page-about .about-culture .sec-idx{ color: #C43E00; }
.page-about .about-culture .sec-note{
  color: rgba(16, 16, 16, .55);
  border-left-color: rgba(16, 16, 16, .22);
}
.page-about .culture-body p{
  margin: 0 0 18px;
  max-width: 34em;
  font-size: 16px;
  line-height: 2;
  color: #242424;
}
.page-about .culture-body p:last-child{ margin-bottom: 0; }
.page-about .culture-figure{
  margin: 32px 0 0;
  border: 1px solid rgba(16, 16, 16, .18);
  background: #EDEAE4;
}
.page-about .culture-figure img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .culture-figure figcaption{
  border-top: 1px solid rgba(16, 16, 16, .15);
  color: rgba(16, 16, 16, .55);
}

/* ---------- 06 合作生态 ---------- */
.page-about .partner-list{
  border-top: var(--about-line);
}
.page-about .partner-row{
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: var(--about-line);
}
.page-about .partner-key{
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}
.page-about .partner-val{
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
}

.page-about .about-cta{
  margin-top: 40px;
  padding: 28px 20px 30px;
  border: var(--about-line);
  border-left: 4px solid var(--lava);
  background: var(--graphite);
}
.page-about .cta-lead{
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--fog);
}
.page-about .cta-links{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px){
  .page-about .hero-facts{ grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .hero-body{ padding: 40px 32px 44px; }
  .page-about .crew-grid{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .desk-step{ grid-template-columns: 110px minmax(0, 1fr); gap: 24px; }
}

@media (min-width: 900px){
  .page-about .about-hero{ padding-top: 40px; }
  .page-about .section{ padding: 96px 0; }
  .page-about .about-culture{ padding: 96px 0 104px; }

  .page-about .hero-frame{ grid-template-columns: 48px minmax(0, 1fr); }
  .page-about .hero-rail{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
    border-right: var(--about-line);
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: .24em;
    color: var(--fog-dim);
  }
  .page-about .hero-rail span{
    writing-mode: vertical-rl;
    transform: rotate(180deg);
  }
  .page-about .hero-rail span:last-child{ color: var(--lava); }
  .page-about .hero-body{ padding: 52px 56px 56px; }
  .page-about .hero-lead{ font-size: 17px; }

  .page-about .origin-grid{
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 60px;
    align-items: start;
  }
  .page-about .origin-figure{ position: sticky; top: calc(var(--bar) + 28px); }

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

  .page-about .partner-row{
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
    padding: 24px 0;
  }
  .page-about .about-cta{ padding: 32px 36px 34px; }
}

@media (min-width: 1200px){
  .page-about .origin-grid{ grid-template-columns: minmax(0, 1fr) 400px; gap: 80px; }
  .page-about .culture-body p{ font-size: 17px; }
  .page-about .culture-figure{ margin-top: 44px; }
}

@media (prefers-reduced-motion: reduce){
  .page-about [data-reveal]{
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .page-about .crew-card,
  .page-about .desk-step,
  .page-about .inline-link{ transition: none !important; }
}
<<<END>>>