:root{
  --ink:#26171a;
  --pri:#eb879c;
  --sec:#ffb6c1;
  --pri-deep:#a94460;
  --paper:#fdf5f6;
  --card:#ffffff;
  --line:rgba(38,23,26,.12);
  --soft:0 1px 2px rgba(38,23,26,.05),0 8px 20px rgba(235,135,156,.16);
  --soft-lg:0 2px 4px rgba(38,23,26,.06),0 16px 36px rgba(235,135,156,.24);
  --r:18px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Noto Serif JP','Hiragino Mincho ProN','Yu Mincho','Songti SC',serif;
  font-size:17px;
  line-height:1.85;
  overflow-x:hidden;
}
img{max-width:100%;height:auto}
p{margin:0 0 14px}
a{color:inherit}
:focus-visible{outline:3px solid var(--pri-deep);outline-offset:3px;border-radius:8px}
.sr{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

.shell{margin-left:152px;min-height:100vh;display:flex;flex-direction:column}

/* 左侧竖排导航 */
.rail{
  position:fixed;
  inset:0 auto 0 0;
  width:152px;
  z-index:30;
  display:flex;
  flex-direction:column;
  gap:14px;
  padding:16px 10px 26px;
  background:linear-gradient(185deg,#ffffff 0%,#fdeef1 60%,#fbe3e8 100%);
  border-right:1px solid var(--line);
  overflow-y:auto;
  overscroll-behavior:contain;
}
.mark{display:block;text-decoration:none;align-self:flex-start}
.mark-box{
  display:grid;
  place-items:center;
  width:46px;height:46px;
  border-radius:14px;
  background:linear-gradient(150deg,var(--sec),var(--pri));
  box-shadow:var(--soft);
  color:#fff;
  overflow:hidden;
  transition:transform .24s ease,box-shadow .24s ease;
}
.mark:hover .mark-box{transform:translateY(-2px);box-shadow:var(--soft-lg)}
.mark-ch{font-size:20px;font-weight:600;line-height:1}
.mark-img{width:100%;height:100%;object-fit:contain}

.rail-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}
.rail-list a{
  display:flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:6px 9px;
  border-radius:12px;
  font-size:16px;
  line-height:1.4;
  text-decoration:none;
  color:var(--ink);
  transition:background .24s ease,color .24s ease,transform .24s ease;
}
.rail-list a::before{
  content:"";
  flex:0 0 auto;
  width:9px;height:9px;
  border:1.5px solid var(--pri-deep);
  border-radius:50%;
  transition:background .24s ease,border-color .24s ease,transform .24s ease;
}
.rail-list li:nth-child(2n) a::before{border-radius:2px;transform:rotate(45deg)}
.rail-list li:nth-child(3n) a::before{background:var(--sec);border-color:var(--pri)}
.rail-list a:hover{background:#fff;transform:translateX(3px)}
.rail-list a.is-on{background:var(--pri);color:#fff}
.rail-list a.is-on::before{background:#fff;border-color:#fff}

/* 首屏 */
.hero{
  position:relative;
  min-height:45vh;
  display:flex;
  flex-direction:column;
  justify-content:flex-end;
  gap:16px;
  padding:clamp(26px,6vw,60px) clamp(20px,5vw,64px) clamp(22px,4vw,44px);
  text-align:right;
  background:linear-gradient(205deg,#ffffff 0%,#fdeff2 52%,#ffe4e9 100%);
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute;
  left:-8%;top:-14%;
  width:62%;height:78%;
  background:linear-gradient(160deg,rgba(255,182,193,.42),rgba(255,255,255,0));
  clip-path:polygon(0 0,100% 0,64% 100%,0 82%);
  pointer-events:none;
}
.hero-text{position:relative;max-width:660px;margin-left:auto}
.eyebrow{
  margin:0 0 8px;
  font-family:'Noto Sans JP',system-ui,sans-serif;
  font-size:16px;
  letter-spacing:.22em;
  color:var(--pri-deep);
}
h1{
  margin:0 0 10px;
  font-size:clamp(29px,5.2vw,46px);
  line-height:1.32;
  letter-spacing:.01em;
}
.lede{margin:0;color:#5b4148;font-size:16px}
.hero-media{position:relative;margin-top:6px}
.hero-img{
  display:block;
  width:100%;
  height:clamp(130px,26vh,250px);
  object-fit:cover;
  border-radius:var(--r);
  box-shadow:var(--soft-lg);
}
.band{
  height:clamp(16px,2.6vw,28px);
  background:linear-gradient(90deg,var(--pri),var(--sec));
  clip-path:polygon(0 0,100% 0,100% 52%,0 100%);
}

/* 正文 */
.wrap{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:clamp(22px,4vw,52px) clamp(16px,4vw,40px);
  display:grid;
  grid-template-columns:minmax(0,1fr) 270px;
  gap:clamp(20px,3vw,44px);
  align-items:start;
  flex:1 0 auto;
}
.stage{min-width:0}
.sheet{
  background:var(--card);
  border-radius:var(--r);
  padding:clamp(18px,3.4vw,40px);
  box-shadow:var(--soft);
}
.sheet > article{position:relative;padding-block:26px;scroll-margin-top:clamp(24px,9vh,96px)}
.sheet > article:first-child{padding-top:0}
.sheet > article:last-child{padding-bottom:0}
.sheet > article + article::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:9px;
  background:linear-gradient(90deg,var(--sec),var(--pri));
  clip-path:polygon(0 0,100% 0,100% 46%,0 100%);
}
.sheet h2{
  font-size:clamp(21px,2.7vw,28px);
  line-height:1.4;
  margin:0 0 8px;
}
.sheet h2 + hr{
  border:0;
  width:66px;height:3px;
  margin:0 0 18px;
  border-radius:3px;
  background:linear-gradient(90deg,var(--pri),var(--sec));
}
.sheet h3{font-size:19px;line-height:1.5;margin:24px 0 8px}
.sheet ul,.sheet ol{margin:0 0 16px;padding-left:1.35em}
.sheet li{margin:.3em 0}
.sheet a{color:var(--pri-deep);text-decoration:underline;text-underline-offset:3px}
.sheet a:hover{color:var(--ink)}
.sheet strong{font-weight:700}
.sheet img{border-radius:var(--r);display:block;margin:16px 0;box-shadow:var(--soft)}
.sheet blockquote{
  margin:0 0 16px;
  padding:12px 16px;
  background:#fff6f8;
  border-left:4px solid var(--pri);
  border-radius:0 12px 12px 0;
}
.sheet table{width:100%;border-collapse:collapse;margin:0 0 16px}
.sheet th,.sheet td{padding:8px 10px;border-bottom:1px solid var(--line);text-align:left}

/* 右侧目录 */
.side{
  position:sticky;
  top:22px;
  background:var(--card);
  border-radius:var(--r);
  padding:18px 16px;
  box-shadow:var(--soft);
}
.side h2{margin:0 0 8px;font-size:17px;letter-spacing:.08em}
.side hr{
  border:0;
  width:42px;height:3px;
  margin:0 0 12px;
  border-radius:3px;
  background:var(--pri);
}
.side-list{list-style:none;margin:0;padding:0;counter-reset:toc}
.side-list li{counter-increment:toc}
.side-list a{
  display:flex;
  gap:9px;
  align-items:center;
  min-height:40px;
  padding:6px 2px;
  font-size:16px;
  line-height:1.45;
  text-decoration:none;
  color:var(--ink);
  border-bottom:1px dashed var(--line);
  transition:color .22s ease,padding-left .22s ease;
}
.side-list a::before{
  content:counter(toc,decimal-leading-zero);
  font-family:'Noto Sans JP',system-ui,sans-serif;
  font-size:13px;
  color:var(--pri-deep);
  letter-spacing:.06em;
}
.side-list a:hover,.side-list a.is-on{color:var(--pri-deep);padding-left:5px}
.side-list li:last-child a{border-bottom:0}

/* 页脚 */
footer{
  margin-top:auto;
  background:var(--ink);
  color:#f8e9ec;
  padding:clamp(28px,5vw,56px) clamp(18px,4vw,44px) 0;
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(20px,3vw,36px);
  font-size:16px;
}
footer article{min-width:0}
.f-brand{display:flex;flex-direction:column;gap:10px}
.f-mark{display:grid;place-items:center;width:44px;height:44px;border-radius:14px;background:linear-gradient(150deg,var(--sec),var(--pri));color:#2a1418;overflow:hidden;font-size:19px;font-weight:600}
.f-mark .mark-img{width:100%;height:100%;object-fit:contain}
.f-name{margin:0;font-size:17px;letter-spacing:.06em}
.f-h{margin:0 0 10px;font-size:16px;letter-spacing:.2em;color:var(--sec);font-weight:500}
.f-list{list-style:none;margin:0;padding:0}
.f-list a{
  display:flex;
  align-items:center;
  min-height:41px;
  padding:4px 0;
  text-decoration:none;
  color:#f8e9ec;
  border-bottom:1px solid rgba(255,255,255,.12);
  transition:color .22s ease,padding-left .22s ease;
}
.f-list a:hover{color:var(--sec);padding-left:5px}

.sub{display:flex;flex-direction:column;gap:10px;max-width:230px}
.sub input{
  min-height:43px;
  padding:9px 12px;
  font:inherit;
  font-size:16px;
  color:#fff;
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.22);
  border-radius:12px;
}
.sub input::placeholder{color:rgba(255,255,255,.6)}
.sub button{
  min-height:43px;
  padding:9px 14px;
  font:inherit;
  font-size:16px;
  font-weight:600;
  color:#2a1418;
  background:linear-gradient(120deg,var(--sec),var(--pri));
  border:0;
  border-radius:12px;
  cursor:pointer;
  transition:transform .22s ease,box-shadow .22s ease;
}
.sub button:hover{transform:translateY(-2px);box-shadow:0 10px 20px rgba(235,135,156,.35)}

.f-base{
  grid-column:1/-1;
  margin-top:clamp(16px,3vw,28px);
  padding:16px 0 22px;
  border-top:1px solid rgba(255,255,255,.14);
  display:flex;
  flex-wrap:wrap;
  gap:10px 18px;
  justify-content:center;
  align-items:center;
  text-align:center;
}
.copy{margin:0;font-size:16px;color:#e7d2d7}
.top{
  display:inline-flex;
  align-items:center;
  min-height:41px;
  padding:4px 14px;
  border:1px solid rgba(255,255,255,.28);
  border-radius:12px;
  text-decoration:none;
  font-size:16px;
  transition:background .22s ease,color .22s ease;
}
.top:hover{background:var(--sec);color:#2a1418}

/* 滚动显现 */
html.js [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .28s ease,transform .28s ease}
html.js [data-reveal].is-in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms !important;animation-duration:.01ms !important}
  html.js [data-reveal]{opacity:1;transform:none}
}

@media (max-width:1000px){
  .wrap{grid-template-columns:minmax(0,1fr)}
  .side{position:static;order:2}
  footer{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:960px){
  .shell{margin-left:0;padding-top:62px}
  .rail{
    inset:0 0 auto 0;
    width:auto;
    flex-direction:row;
    align-items:center;
    gap:10px;
    padding:8px 12px;
    border-right:0;
    border-bottom:1px solid var(--line);
    overflow-x:auto;
    overflow-y:hidden;
  }
  .rail-list{flex-direction:row;gap:6px}
  .rail-list a{white-space:nowrap;padding:6px 11px}
  .rail-list a:hover{transform:none}
  .mark-box{width:42px;height:42px}
  .hero{min-height:0;padding-top:26px;text-align:right}
  .sheet > article{scroll-margin-top:80px}
  .sheet table{display:block;overflow-x:auto}
}

@media (max-width:620px){
  body{font-size:16px}
  .wrap{padding-left:14px;padding-right:14px}
  footer{grid-template-columns:minmax(0,1fr);gap:18px}
  .sub{max-width:none}
  .hero-img{height:150px}
}

button[aria-expanded]{min-width:44px;min-height:44px}