/* ===== 品牌故事 · 旧纸叙事页 ===== */
.page-about{
  --ab-paper:#F2EDE3;
  --ab-ink:#0E2B26;
  --ab-ink-2:rgba(14,43,38,.8);
  --ab-ink-3:rgba(14,43,38,.56);
  --ab-edge:rgba(56,71,75,.4);
  --ab-edge-2:rgba(56,71,75,.18);
  --ab-sheet:rgba(56,71,75,.2);
  overflow-x:clip;
}

/* ---- 面包屑 ---- */
.page-about .breadcrumb{
  padding-top:18px;
}

/* ---- 首屏 ---- */
.page-about .about-hero{
  position:relative;
  margin-top:16px;
  padding:clamp(26px,4.5vw,58px) 0 clamp(32px,5.5vw,70px);
  background:
    radial-gradient(110% 80% at 88% -20%, rgba(43,227,200,.16), transparent 62%),
    radial-gradient(70% 60% at 4% 112%, rgba(255,122,60,.13), transparent 70%),
    linear-gradient(180deg,#0A1A2A 0%,#0E2B26 100%);
  border-top:1px solid var(--ab-edge);
  border-bottom:1px solid var(--ab-edge);
}
.page-about .about-hero::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(56,71,75,.24) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56,71,75,.24) 1px, transparent 1px);
  background-size:104px 104px;
  opacity:.5;
  pointer-events:none;
}
.page-about .about-hero .container{
  position:relative;
  z-index:1;
}
.page-about .about-hero h1{
  margin:16px 0 0;
  max-width:13em;
  font-size:clamp(31px,6vw,66px);
  line-height:1.03;
  letter-spacing:-.015em;
  font-weight:900;
  color:var(--paper);
}
.page-about .about-hero__text{
  margin:22px 0 0;
  max-width:44em;
  font-size:clamp(15px,1.6vw,17px);
  line-height:1.82;
  color:var(--paper-2);
}

/* 概况面板 */
.page-about .about-hero__spec{
  margin-top:28px;
}
.page-about .about-hero__spec-inner{
  padding:18px 18px 14px;
  background:linear-gradient(180deg,rgba(245,240,231,.97),rgba(242,237,227,.9));
  border:1px solid rgba(56,71,75,.5);
  box-shadow:7px 7px 0 rgba(43,227,200,.18), 14px 14px 0 rgba(56,71,75,.3);
  color:var(--ab-ink);
}
.page-about .about-hero__spec-title{
  margin:0 0 10px;
  font-size:11px;
  letter-spacing:.16em;
  color:rgba(14,43,38,.58);
}
.page-about .about-hero__spec-row{
  display:flex;
  justify-content:space-between;
  align-items:baseline;
  gap:12px;
  padding:9px 0;
  border-top:1px dashed rgba(56,71,75,.32);
}
.page-about .about-hero__spec-row dt{
  font-size:12.5px;
  letter-spacing:.03em;
  color:rgba(14,43,38,.62);
}
.page-about .about-hero__spec-row dd{
  margin:0;
  font-family:var(--mono);
  font-size:15px;
  font-weight:600;
  color:var(--ab-ink);
  white-space:nowrap;
}

/* ---- 主体骨架 ---- */
.page-about .about-shell{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:32px;
  padding:clamp(34px,5vw,68px) 0 clamp(18px,3vw,30px);
}

/* ---- 左侧章节索引 ---- */
.page-about .about-index{
  display:none;
}
.page-about .about-index__title{
  margin:0 0 14px;
  font-size:11px;
  letter-spacing:.16em;
  color:var(--paper-4);
}
.page-about .about-index__list{
  position:relative;
  margin:0;
  padding:0 0 0 14px;
  list-style:none;
}
.page-about .about-index__list::before{
  content:"";
  position:absolute;
  left:0;
  top:8px;
  bottom:8px;
  width:1px;
  background:linear-gradient(180deg,rgba(43,227,200,.9),rgba(92,122,94,.3));
}
.page-about .about-index__item{
  margin:0;
}
.page-about .about-index__link{
  display:block;
  padding:9px 0;
  font-size:12.5px;
  line-height:1.5;
  color:var(--paper-3);
  text-decoration:none;
  border-bottom:1px dashed rgba(56,71,75,.6);
  transition:color .16s ease,padding-left .16s ease;
}
.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible{
  color:var(--cyan);
  padding-left:4px;
}

/* ---- 章节卡片（旧纸叠层） ---- */
.page-about .ab-chapter{
  position:relative;
  margin-bottom:clamp(22px,3.2vw,36px);
  padding:clamp(22px,3.4vw,40px);
  background:linear-gradient(180deg,#F5F0E6 0%,#F2EDE3 100%);
  border:1px solid var(--ab-edge);
  box-shadow:8px 8px 0 var(--ab-sheet), 16px 16px 0 rgba(56,71,75,.1);
  scroll-margin-top:104px;
}
.page-about .ab-chapter:nth-child(even){
  box-shadow:-6px 8px 0 var(--ab-sheet), -12px 16px 0 rgba(56,71,75,.1);
}
.page-about .ab-chapter__head{
  display:flex;
  align-items:baseline;
  flex-wrap:wrap;
  gap:12px;
  margin-bottom:18px;
  padding-top:12px;
  border-top:2px solid var(--ab-ink);
}
.page-about .ab-chapter__num{
  display:inline-block;
  padding:3px 7px;
  font-family:var(--mono);
  font-size:11px;
  line-height:1;
  letter-spacing:.14em;
  color:var(--paper);
  background:var(--ab-ink);
}
.page-about .ab-chapter__title{
  margin:0;
  font-size:clamp(21px,2.8vw,32px);
  line-height:1.24;
  letter-spacing:-.01em;
  font-weight:900;
  color:var(--ab-ink);
}
.page-about .ab-chapter__body p{
  margin:0 0 14px;
  font-size:15.5px;
  line-height:1.82;
  color:var(--ab-ink-2);
}
.page-about .ab-chapter__body p:last-child{
  margin-bottom:0;
}
.page-about .ab-chapter__body strong{
  color:var(--ab-ink);
  font-weight:700;
}
.page-about .ab-drop::first-letter{
  float:left;
  margin:.08em .12em 0 0;
  font-size:3.1em;
  line-height:.84;
  font-weight:900;
  color:var(--ab-ink);
}

/* 旁注 */
.page-about .ab-note{
  margin:18px 0;
  padding:11px 14px;
  border-left:3px solid var(--moss-2);
  background:rgba(92,122,94,.12);
  font-size:13.5px;
  line-height:1.72;
  color:rgba(14,43,38,.66);
}

/* 正文内联链接 */
.page-about .ab-inline-link{
  color:#14665A;
  text-decoration:none;
  border-bottom:1px solid rgba(20,102,90,.45);
}
.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible{
  color:#0B3F37;
  border-bottom-color:#0B3F37;
}

/* 列表 */
.page-about .ab-list{
  margin:16px 0;
  padding:0;
  list-style:none;
}
.page-about .ab-list li{
  position:relative;
  padding:11px 0 11px 24px;
  border-top:1px dashed var(--ab-edge-2);
  font-size:15px;
  line-height:1.76;
  color:var(--ab-ink-2);
}
.page-about .ab-list li:last-child{
  border-bottom:1px dashed var(--ab-edge-2);
}
.page-about .ab-list li::before{
  content:"";
  position:absolute;
  left:2px;
  top:21px;
  width:9px;
  height:1px;
  background:#C0522A;
}

/* 图文分栏 */
.page-about .ab-split{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:22px;
}
.page-about .ab-split__text p{
  margin-bottom:14px;
}

/* 图片 */
.page-about .ab-figure{
  margin:0 0 8px;
}
.page-about .ab-figure .img-frame{
  background:rgba(56,71,75,.14);
  border:1px solid var(--ab-edge);
  overflow:hidden;
}
.page-about .ab-figure img{
  display:block;
  width:100%;
  height:auto;
  max-width:100%;
  object-fit:cover;
  filter:saturate(.84) contrast(1.04);
}
.page-about .ab-figure .img-frame__cap{
  color:rgba(14,43,38,.55);
}

/* ---- 里程碑时间轴 ---- */
.page-about .ab-timeline{
  position:relative;
  margin:22px 0 0;
  padding:0;
  list-style:none;
}
.page-about .ab-timeline::before{
  content:"";
  position:absolute;
  left:6px;
  top:10px;
  bottom:16px;
  width:2px;
  background:linear-gradient(180deg,rgba(92,122,94,.9),rgba(92,122,94,.22));
}
.page-about .ab-node{
  position:relative;
  padding:0 0 22px 30px;
  outline:none;
  scroll-margin-top:104px;
}
.page-about .ab-node:last-child{
  padding-bottom:0;
}
.page-about .ab-node::before{
  content:"";
  position:absolute;
  left:0;
  top:6px;
  box-sizing:border-box;
  width:14px;
  height:14px;
  border:2px solid var(--moss-2);
  border-radius:50%;
  background:var(--ab-paper);
}
.page-about .ab-node--now::before{
  border-color:#C0522A;
  background:#C0522A;
  box-shadow:0 0 0 4px rgba(255,122,60,.2);
}
.page-about .ab-node__phase{
  display:inline-block;
  margin-bottom:8px;
  padding:2px 8px;
  font-size:11px;
  letter-spacing:.1em;
  color:var(--ab-ink);
  background:rgba(92,122,94,.22);
}
.page-about .ab-node__title{
  margin:0;
  font-size:16.5px;
  line-height:1.45;
  font-weight:700;
  color:var(--ab-ink);
}
.page-about .ab-node__meta{
  margin:6px 0 0;
  font-size:13.5px;
  line-height:1.7;
  color:var(--ab-ink-3);
}
.page-about .ab-node__more{
  margin:0;
  padding:0 0 0 12px;
  max-height:0;
  overflow:hidden;
  opacity:0;
  border-left:2px solid transparent;
  font-size:13.5px;
  line-height:1.74;
  color:var(--ab-ink-3);
  transition:max-height .2s ease,opacity .2s ease,padding .2s ease,border-color .2s ease;
}
.page-about .ab-node:hover .ab-node__more,
.page-about .ab-node:focus-within .ab-node__more,
.page-about .ab-node:focus .ab-node__more{
  max-height:260px;
  margin-top:10px;
  padding-top:2px;
  padding-bottom:2px;
  opacity:1;
  border-left-color:var(--moss-2);
}
@media (hover:none){
  .page-about .ab-node__more{
    max-height:none;
    margin-top:10px;
    padding-top:2px;
    padding-bottom:2px;
    opacity:1;
    border-left-color:rgba(92,122,94,.6);
  }
}

/* ---- 延伸入口 ---- */
.page-about .ab-next{
  padding:6px 0 clamp(34px,5vw,60px);
}
.page-about .ab-next__heading{
  margin:0;
  font-size:clamp(17px,2vw,22px);
  font-weight:900;
  letter-spacing:-.01em;
  color:var(--paper);
}
.page-about .ab-next__grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:12px;
  margin-top:16px;
}
.page-about .ab-next__card{
  display:block;
  padding:16px 18px;
  background:rgba(14,43,38,.74);
  border:1px solid var(--line);
  text-decoration:none;
  transition:border-color .16s ease,transform .16s ease;
}
.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible{
  border-color:var(--cyan);
  transform:translateY(-2px);
}
.page-about .ab-next__label{
  display:block;
  margin-bottom:8px;
  font-size:11px;
  letter-spacing:.14em;
  color:var(--cyan);
}
.page-about .ab-next__title{
  display:block;
  font-size:14.5px;
  line-height:1.62;
  color:var(--paper-2);
}

/* ---- 响应式 ---- */
@media (min-width:760px){
  .page-about .ab-split{
    grid-template-columns:minmax(0,1.18fr) minmax(0,.82fr);
    align-items:start;
    gap:26px;
  }
  .page-about .ab-split--flip{
    grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);
  }
  .page-about .ab-split--flip .ab-split__media{
    order:-1;
  }
  .page-about .ab-figure{
    margin-bottom:0;
  }
  .page-about .ab-next__grid{
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:14px;
  }
}

@media (min-width:900px){
  .page-about .about-hero__spec{
    margin-top:4px;
  }
}

@media (min-width:1000px){
  .page-about .about-shell{
    grid-template-columns:168px minmax(0,1fr);
    gap:52px;
  }
  .page-about .about-index{
    display:block;
    position:sticky;
    top:104px;
    align-self:start;
  }
  .page-about .about-main{
    padding-right:20px;
  }
}

@media (min-width:1200px){
  .page-about .about-shell{
    grid-template-columns:190px minmax(0,1fr);
    gap:64px;
  }
}
<<<END>>>