@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:wght@400;500;600;700&family=Libre+Baskerville:wght@400;700&display=swap');

:root{
  --paper:#fafaf8;
  --ink:#1a1a1a;
  --mid:#4a4a4a;
  --line:#d7d4c9;
  --soft:#f1efe8;
  --shadow:0 12px 26px -18px rgba(26,26,26,.7);
  --shadow-soft:0 18px 40px -30px rgba(26,26,26,.85);
}

*,*::before,*::after{box-sizing:border-box}

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    radial-gradient(circle at 13% 16%, rgba(26,26,26,.038), transparent 46%),
    radial-gradient(circle at 84% 7%, rgba(74,74,74,.05), transparent 42%),
    radial-gradient(circle at 62% 88%, rgba(26,26,26,.03), transparent 50%),
    repeating-linear-gradient(90deg, rgba(26,26,26,.024) 0 1px, transparent 1px 5px),
    repeating-linear-gradient(0deg, rgba(26,26,26,.016) 0 1px, transparent 1px 7px);
  font-family:'Libre Baskerville','Cormorant Garamond','Songti SC','Noto Serif SC',Georgia,serif;
  font-size:17px;
  line-height:1.78;
  letter-spacing:.012em;
}

img{max-width:100%;height:auto;display:block}

a{color:var(--ink);text-decoration:none}

p{margin:0 0 1em}

h1,h2,h3{
  font-family:'Cormorant Garamond','Libre Baskerville','Songti SC',Georgia,serif;
  font-weight:600;
  line-height:1.28;
  letter-spacing:.015em;
  margin:0 0 .5em;
}

h2>span,h3>span{
  display:inline;
  padding-bottom:3px;
  border-bottom:2px solid rgba(26,26,26,.32);
  box-decoration-break:clone;
}

.skip{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:60;
  padding:12px 18px;
  background:var(--ink);
  color:var(--paper);
  border-radius:0 0 18px 0;
}
.skip:focus{left:0}

/* ---------- 顶部：品牌居中，目录分列两侧 ---------- */
.topbar{
  position:sticky;
  top:0;
  z-index:40;
  background:rgba(250,250,248,.95);
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 0 rgba(26,26,26,.06);
}

.topbar-grid{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:12px;
  max-width:1140px;
  margin:0 auto;
  padding:6px 20px;
}

.rail{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:2px 4px;
}
.rail-r{justify-content:flex-end}

.rail>a,.grp-trigger,.rail-cta{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 11px;
  font-size:16px;
  color:var(--mid);
  border-bottom:1px dashed transparent;
  transition:color .12s steps(2,end),border-color .12s steps(2,end);
}
.rail>a:hover,.grp-trigger:hover,.rail-cta:hover{
  color:var(--ink);
  border-bottom-color:var(--ink);
}

.rail-cta{
  color:var(--ink);
  border:1px solid var(--ink);
  border-radius:18px 22px 20px 24px;
  padding:0 15px;
  margin-left:6px;
  transform:rotate(-.8deg);
}
.rail-cta:hover{background:var(--soft)}

.brand{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:6px 10px;
  justify-self:center;
  transform:rotate(-.5deg);
}
.brand-mark{
  width:30px;
  height:30px;
  object-fit:contain;
  filter:grayscale(1) contrast(1.15);
}
.brand-text{
  font-family:'Cormorant Garamond','Songti SC',Georgia,serif;
  font-size:23px;
  font-weight:600;
  letter-spacing:.14em;
  white-space:nowrap;
}

.grp{position:relative;display:inline-flex}

.grp-trigger{cursor:default}
.grp-trigger::after{
  content:"";
  width:7px;
  height:7px;
  margin-left:7px;
  border-right:1.5px solid var(--mid);
  border-bottom:1.5px solid var(--mid);
  transform:rotate(45deg) translateY(-2px);
}

.grp-panel{
  display:none;
  position:absolute;
  top:100%;
  right:0;
  min-width:196px;
  padding:7px;
  background:var(--paper);
  border:1px solid var(--ink);
  border-radius:16px 22px 18px 24px;
  box-shadow:var(--shadow-soft);
  transform:rotate(.5deg);
}
.grp-panel a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0 12px;
  font-size:16px;
  color:var(--mid);
  border-radius:12px;
}
.grp-panel a:hover{
  color:var(--ink);
  background:var(--soft);
}
.grp:hover .grp-panel,
.grp:focus-within .grp-panel{display:block}

/* ---------- 首屏 ---------- */
.hero{
  display:flex;
  flex-direction:column;
  justify-content:flex-end;
  gap:26px;
  min-height:70vh;
  max-width:1140px;
  margin:0 auto;
  padding:46px 20px 0;
  scroll-margin-top:110px;
}

.hero-copy{text-align:right}

.kicker{
  font-size:16px;
  color:var(--mid);
  letter-spacing:.2em;
  margin:0 0 10px;
}

.hero h1{
  font-size:clamp(30px,5.6vw,56px);
  line-height:1.22;
  margin:0 0 14px;
  letter-spacing:.02em;
}
.hero h1::after{
  content:"";
  display:block;
  width:96px;
  height:3px;
  margin:14px 0 0 auto;
  background:var(--mid);
  transform:rotate(-1.2deg);
  border-radius:3px;
}

.lede{
  max-width:40ch;
  margin:0 0 8px auto;
  color:var(--mid);
  font-size:17px;
}

.hero-meta{
  margin:0;
  font-size:15px;
  color:var(--mid);
  letter-spacing:.08em;
}

.hero-fig{
  margin:0;
  border:1px solid var(--ink);
  border-radius:28px;
  overflow:hidden;
  box-shadow:var(--shadow);
  transform:rotate(-.6deg);
}
.hero-img{
  width:100%;
  height:auto;
  max-height:44vh;
  object-fit:cover;
  filter:grayscale(.35) contrast(1.05);
}

/* ---------- 主体：索引在左，正文在右 ---------- */
.shell{
  display:grid;
  grid-template-columns:232px minmax(0,1fr);
  gap:38px;
  align-items:start;
  max-width:1140px;
  margin:46px auto 0;
  padding:0 20px 64px;
}

main{min-width:0}
#page-body{scroll-margin-top:110px}

.side{
  position:sticky;
  top:104px;
  padding:22px 20px 20px;
  border:1px dashed var(--mid);
  border-radius:28px;
  background:rgba(255,255,255,.5);
  box-shadow:var(--shadow);
  transform:rotate(-.5deg);
}

.tape{
  position:absolute;
  top:-11px;
  left:26px;
  width:66px;
  height:22px;
  background:rgba(74,74,74,.16);
  border-left:1px solid rgba(74,74,74,.22);
  border-right:1px solid rgba(74,74,74,.22);
  transform:rotate(-4deg);
}

.side-h{
  font-size:19px;
  margin:0 0 12px;
}

.side-list{
  list-style:none;
  margin:0 0 14px;
  padding:0;
  counter-reset:sidx;
}
.side-list li{counter-increment:sidx}
.side-list a{
  display:flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:2px 4px;
  font-size:16px;
  color:var(--mid);
  border-bottom:1px dashed var(--line);
}
.side-list a::before{
  content:counter(sidx,decimal-leading-zero);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--mid);
  opacity:.7;
  min-width:20px;
}
.side-list a:hover{color:var(--ink);border-bottom-color:var(--ink)}

.side-note{
  margin:0;
  font-size:14px;
  line-height:1.7;
  color:var(--mid);
}

/* ---------- 正文 ---------- */
.prose{padding-bottom:10px}

.content-body{
  padding:32px clamp(18px,3.4vw,42px) 34px;
  background:rgba(255,255,255,.62);
  border:1px solid var(--line);
  border-radius:28px;
  box-shadow:var(--shadow-soft);
}

.content-body>div{
  scroll-margin-top:118px;
}
.content-body>div+div{
  margin-top:40px;
  padding-top:32px;
  border-top:1px dashed var(--line);
}

.content-body h2{
  font-size:clamp(23px,2.6vw,30px);
  margin:0 0 .55em;
}
.content-body h3{
  font-size:20px;
  margin:1.4em 0 .5em;
}

.content-body p{color:#262626}
.content-body strong{font-weight:700}

.content-body ul,.content-body ol{
  padding-left:1.35em;
  margin:0 0 1.1em;
}
.content-body li{margin:0 0 .45em}
.content-body li::marker{color:var(--mid)}

.content-body blockquote{
  margin:1.3em 0;
  padding:14px 18px;
  border-left:3px solid var(--mid);
  background:var(--soft);
  border-radius:0 20px 22px 0;
  color:var(--mid);
}
.content-body blockquote p:last-child{margin:0}

.content-body img{
  border-radius:20px;
  border:1px solid var(--line);
  margin:1.2em 0;
  filter:grayscale(.2);
}

.content-body a{
  border-bottom:1px solid var(--mid);
}
.content-body a:hover{
  background:var(--soft);
}

/* ---------- 页尾附加块 ---------- */
.afterword{
  margin-top:34px;
  padding:26px clamp(18px,3vw,34px) 28px;
  border:1px solid var(--line);
  border-radius:28px;
  background:rgba(241,239,232,.55);
}

.after-h{
  font-size:21px;
  margin:0 0 16px;
}

.after-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  gap:14px;
}

.after-card{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:16px 18px;
  border:1px solid var(--ink);
  border-radius:22px 26px 24px 28px;
  background:var(--paper);
  box-shadow:var(--shadow);
  transition:transform .14s steps(3,end);
}
.after-card:nth-child(2){transform:rotate(.7deg)}
.after-card:hover{transform:translateY(-3px) rotate(-.7deg)}

.after-tag{
  font-size:13px;
  letter-spacing:.14em;
  color:var(--mid);
}
.after-name{font-size:18px}
.after-desc{font-size:15px;color:var(--mid);line-height:1.65}

/* ---------- 页脚：多分区 ---------- */
.foot{
  display:grid;
  grid-template-columns:1.5fr 1fr 1.1fr;
  gap:34px;
  max-width:1140px;
  margin:0 auto;
  padding:44px 20px 22px;
  border-top:1px solid var(--ink);
}

.foot-h{font-size:19px;margin:0 0 10px}

.foot-copy{
  margin:0 0 10px;
  font-size:15px;
  line-height:1.72;
  color:var(--mid);
}
.foot-copy-dim{font-size:14px;opacity:.85}

.foot-nav dl{
  display:flex;
  flex-wrap:wrap;
  gap:2px 18px;
  margin:0;
}
.foot-nav dt{
  width:100%;
  font-size:14px;
  letter-spacing:.14em;
  color:var(--mid);
  margin-bottom:2px;
}
.foot-nav dd{margin:0}
.foot-nav dd a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  font-size:16px;
  color:var(--mid);
  border-bottom:1px dashed transparent;
}
.foot-nav dd a:hover{color:var(--ink);border-bottom-color:var(--ink)}

.sub-label{
  display:block;
  font-size:14px;
  letter-spacing:.14em;
  color:var(--mid);
  margin-bottom:6px;
}

.sub-row{display:flex;gap:8px;margin-bottom:10px}

.sub-input{
  flex:1 1 auto;
  min-width:0;
  min-height:44px;
  padding:0 12px;
  font-family:inherit;
  font-size:16px;
  color:var(--ink);
  background:rgba(255,255,255,.7);
  border:1px solid var(--mid);
  border-radius:14px 18px 16px 20px;
}
.sub-input:focus{outline:2px dashed var(--ink);outline-offset:2px}

.sub-btn{
  flex:0 0 auto;
  min-height:44px;
  padding:0 18px;
  font-family:inherit;
  font-size:16px;
  color:var(--paper);
  background:var(--ink);
  border:1px solid var(--ink);
  border-radius:18px 22px 20px 24px;
  cursor:pointer;
  transform:rotate(-.8deg);
}
.sub-btn:hover{background:var(--mid)}

.foot-base{
  grid-column:1/-1;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:8px 20px;
  padding-top:14px;
  border-top:1px dashed var(--line);
}
.foot-sign,.foot-jump{margin:0;font-size:14px;color:var(--mid)}
.foot-jump{display:flex;gap:18px}
.foot-jump a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  border-bottom:1px dashed var(--mid);
}
.foot-jump a:hover{color:var(--ink);border-bottom-color:var(--ink)}

/* ---------- 滚动显现 ---------- */
.js-anim .reveal{
  opacity:0;
  transform:translateY(12px);
}
.js-anim .reveal.in{
  opacity:1;
  transform:none;
  transition:opacity .34s steps(5,end),transform .34s steps(5,end);
}

/* ---------- 断点 ---------- */
@media (max-width:980px){
  .shell{
    grid-template-columns:minmax(0,1fr);
    gap:26px;
    margin-top:32px;
  }
  #page-body{scroll-margin-top:250px}
  .side{
    position:static;
    transform:none;
    padding:18px 16px 16px;
  }
  .side-list{
    display:flex;
    flex-wrap:wrap;
    gap:4px 10px;
    margin-bottom:10px;
  }
  .side-list a{
    min-height:44px;
    border:1px dashed var(--line);
    border-radius:16px;
    padding:2px 12px;
  }
  .foot{grid-template-columns:1fr 1fr}
  .foot-a{grid-column:1/-1}
  .foot-c{grid-column:1/-1}
}

@media (max-width:860px){
  .topbar-grid{
    grid-template-columns:minmax(0,1fr);
    gap:4px;
    padding:4px 14px 8px;
  }
  .brand{order:-1;justify-self:start;transform:none}
  .brand-text{font-size:21px;letter-spacing:.1em}
  .rail{justify-content:flex-start}
  .rail-r{justify-content:flex-start}
  .rail-cta{margin-left:0}
  .grp{position:static;display:block}
  .grp-trigger{cursor:pointer;color:var(--mid)}
  .grp-panel{
    position:static;
    display:block;
    min-width:0;
    padding:0;
    border:0;
    border-radius:0;
    box-shadow:none;
    transform:none;
    background:transparent;
  }
  .grp-panel a{
    min-height:44px;
    padding:0 12px;
  }
  .hero{
    min-height:auto;
    padding:26px 16px 0;
    gap:20px;
  }
  .hero h1::after{margin-left:auto}
  .shell{padding:0 16px 44px}
  .content-body{
    padding:24px 18px 26px;
    border-radius:22px;
  }
  .foot{
    grid-template-columns:minmax(0,1fr);
    padding:32px 16px 20px;
    gap:26px;
  }
}

@media (max-width:430px){
  body{font-size:16px}
  .hero h1{font-size:clamp(27px,8.4vw,36px)}
  .lede{font-size:16px}
  .content-body h2{font-size:22px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js-anim .reveal{opacity:1;transform:none;transition:none}
  .after-card,.rail>a,.grp-trigger,.rail-cta{transition:none}
}

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