@import url('https://fonts.googleapis.com/css2?family=Bodoni+Moda:wght@400;500;600;700&family=Jost:wght@300;400;500;600;700&display=swap');

:root{
  --ink:#000000;
  --paper:#ffffff;
  --mut:#5c5c5c;
  --line:#d8d8d8;
  --wash:#f4f4f4;
  --serif:"Bodoni Moda",Georgia,"Songti SC","Times New Roman",serif;
  --sans:"Jost","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --gut:clamp(18px,4.4vw,72px);
  --head-h:112px;
}

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

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

body{
  margin:0;
  overflow-x:clip;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.7;
  font-weight:400;
  letter-spacing:.01em;
}

img{max-width:100%;display:block;height:auto}
a{color:inherit}
p{margin:0 0 1em}
::selection{background:var(--ink);color:var(--paper)}
:focus-visible{outline:2px solid var(--ink);outline-offset:3px}

.skip{
  position:absolute;left:-9999px;top:0;z-index:99;
  background:var(--ink);color:var(--paper);
  padding:12px 20px;text-decoration:none;font-size:16px;
}
.skip:focus{left:12px;top:12px}

/* ---------- 顶部 ---------- */
.top{
  position:sticky;top:0;z-index:60;
  background:var(--paper);
  border-bottom:1px solid var(--ink);
}
.top-bar{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:0 var(--gut);min-height:64px;
}
.wordmark{
  font-family:var(--serif);
  font-size:clamp(20px,3vw,26px);
  font-weight:600;
  letter-spacing:.02em;
  text-decoration:none;
  display:inline-flex;align-items:center;min-height:44px;
}
.top-cta{
  background:var(--ink);color:var(--paper);
  border:1px solid var(--ink);
  font-size:16px;letter-spacing:.2em;
  text-decoration:none;
  padding:10px 20px;min-height:44px;
  display:inline-flex;align-items:center;
  transition:background .25s ease,color .25s ease;
}
.top-cta:hover{background:var(--paper);color:var(--ink)}

.rail-nav{
  display:flex;align-items:stretch;
  overflow-x:auto;
  border-top:1px solid var(--line);
  scrollbar-width:none;
  -webkit-overflow-scrolling:touch;
}
.rail-nav::-webkit-scrollbar{display:none}
.rail-nav a{
  flex:0 0 auto;
  display:inline-flex;align-items:center;
  min-height:46px;padding:0 18px;
  font-size:16px;letter-spacing:.08em;
  text-decoration:none;white-space:nowrap;
  border-right:1px solid var(--line);
  transition:background .2s ease,color .2s ease;
}
.rail-nav a:hover,.rail-nav a:focus-visible{background:var(--ink);color:var(--paper)}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  min-height:100svh;
  display:flex;align-items:center;
  overflow:hidden;
  background:
    radial-gradient(circle at 1px 1px,rgba(0,0,0,.16) 1px,transparent 0) 0 0/22px 22px,
    var(--paper);
}
.hero-media{position:absolute;inset:0;margin:0;overflow:hidden}
.hero-media img{
  width:100%;height:100%;object-fit:cover;
  filter:grayscale(1) contrast(1.08) brightness(1.02);
  transform:scale(1.08);
  will-change:transform;
}
.hero::after{
  content:"";position:absolute;inset:0;z-index:1;
  background:linear-gradient(96deg,#ffffff 0%,rgba(255,255,255,.86) 40%,rgba(255,255,255,.12) 100%);
}
.hero-copy{
  position:relative;z-index:2;
  padding:72px var(--gut);
  max-width:1080px;
}
.hero h1{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(34px,7.4vw,92px);
  line-height:1.02;
  letter-spacing:-.015em;
  margin:0 0 26px;
  max-width:20ch;
}
.dek{
  max-width:44ch;
  font-size:17px;line-height:1.7;
  color:#1d1d1d;
  border-top:1px solid var(--ink);
  padding-top:14px;
  margin:0 0 22px;
}
.hero-more{
  display:inline-flex;align-items:center;
  min-height:44px;padding:0 0 4px;
  font-size:16px;letter-spacing:.26em;
  text-decoration:none;
  border-bottom:2px solid var(--ink);
}

/* ---------- 正文骨架 ---------- */
main{padding:0}
.wrap{
  display:grid;
  grid-template-columns:minmax(0,1fr) 288px;
  gap:clamp(24px,4vw,68px);
  align-items:start;
  max-width:1260px;
  margin:0 auto;
  padding:clamp(40px,6vw,92px) var(--gut);
}
.content{min-width:0}

.prose{
  font-family:var(--serif);
  font-size:18px;
  line-height:1.82;
  letter-spacing:.005em;
}
.prose article{
  padding:clamp(30px,4vw,54px) 0;
  border-bottom:1px solid var(--line);
  scroll-margin-top:var(--head-h);
}
.prose article:first-of-type{padding-top:0}
.prose article:last-of-type{border-bottom:0;padding-bottom:0}

.prose h2,.prose h3{
  font-family:var(--serif);
  font-weight:600;
  letter-spacing:-.01em;
  line-height:1.12;
  margin:0;
}
.prose h2{font-size:clamp(25px,3.4vw,40px)}
.prose h3{font-size:clamp(20px,2.3vw,27px)}
.prose h2 + hr,.prose h3 + hr{
  border:0;border-top:3px solid var(--ink);
  width:62px;margin:14px 0 22px;
}
.prose hr{border:0;border-top:1px solid var(--line);margin:28px 0}
.prose p{margin:0 0 1.05em}
.prose a{
  text-decoration:none;
  border-bottom:1px solid var(--ink);
  padding-bottom:1px;
}
.prose a:hover{background:var(--ink);color:var(--paper)}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.2em}
.prose li{margin:0 0 .5em}
.prose ul{list-style:none;padding-left:1.1em}
.prose ul li{position:relative}
.prose ul li::before{
  content:"";position:absolute;left:-1.1em;top:.72em;
  width:8px;height:1px;background:var(--ink);
}
.prose strong{font-weight:700}

.prose article:first-of-type > p:first-of-type::first-letter{
  float:left;
  font-family:var(--serif);
  font-weight:700;
  font-size:3.5em;
  line-height:.82;
  padding:6px 12px 0 0;
}

.prose blockquote{
  margin:32px 0;
  padding:6px 0 6px 24px;
  border-left:3px solid var(--ink);
  font-size:1.12em;font-style:italic;line-height:1.56;
}
.prose blockquote p:last-child{margin-bottom:0}

.prose figure{margin:32px 0}
.prose figcaption{
  font-family:var(--sans);
  font-size:16px;color:var(--mut);
  padding-top:10px;border-top:1px solid var(--line);margin-top:10px;
}
.prose img{width:100%}

.prose table{
  width:100%;border-collapse:collapse;
  font-family:var(--sans);font-size:16px;
  margin:0 0 1.4em;
}
.prose th,.prose td{
  border-bottom:1px solid var(--line);
  padding:10px 12px;text-align:left;
}
.prose th{border-bottom:1px solid var(--ink);letter-spacing:.06em}

/* ---------- 侧栏 ---------- */
.rail{
  position:sticky;top:calc(var(--head-h) + 20px);
  border-left:1px solid var(--ink);
  padding-left:22px;
}
.rail h2{
  font-family:var(--sans);
  font-size:16px;font-weight:600;
  letter-spacing:.32em;
  margin:0;
}
.rail hr{
  border:0;border-top:2px solid var(--ink);
  width:44px;margin:12px 0 18px;
}
.rail-list{
  list-style:none;margin:0;padding:0;
  counter-reset:rail;
}
.rail-list li{
  counter-increment:rail;
  border-bottom:1px solid var(--line);
}
.rail-list a{
  display:flex;align-items:center;gap:10px;
  min-height:42px;
  font-size:16px;
  text-decoration:none;
  transition:padding-left .2s ease;
}
.rail-list a::before{
  content:counter(rail,decimal-leading-zero);
  font-size:16px;color:var(--mut);
  letter-spacing:.08em;
}
.rail-list a:hover{padding-left:6px}

/* ---------- 页脚 ---------- */
.colophon{
  border-top:1px solid var(--ink);
  padding:0 var(--gut);
  margin-top:clamp(30px,5vw,70px);
}
.foot-cta{
  display:flex;align-items:baseline;justify-content:space-between;
  gap:20px;flex-wrap:wrap;
  padding:clamp(38px,7vw,92px) 0;
  text-decoration:none;
  border-bottom:1px solid var(--line);
}
.foot-cta span{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(30px,6.6vw,74px);
  line-height:1;
  letter-spacing:-.02em;
}
.foot-cta em{
  font-style:normal;font-size:16px;letter-spacing:.28em;
  border-bottom:2px solid var(--ink);
  padding:10px 0;
  min-height:44px;display:inline-flex;align-items:center;
}
.foot-cta:hover em{background:var(--ink);color:var(--paper)}

.foot-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,3vw,52px);
  padding:6px 0 34px;
}
.foot-cols dl{margin:24px 0 0}
.foot-cols dt{
  font-size:16px;font-weight:600;
  letter-spacing:.24em;
  margin:0 0 8px;
}
.foot-cols dd{margin:0}
.foot-cols a{
  display:inline-flex;align-items:center;
  min-height:40px;font-size:16px;
  text-decoration:none;
  border-bottom:1px solid transparent;
}
.foot-cols a:hover{border-bottom-color:var(--ink)}

.foot-base{
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;flex-wrap:wrap;
  border-top:1px solid var(--ink);
  padding:14px 0 28px;
  font-size:16px;
}
.foot-base p{margin:0}
.foot-base a{
  display:inline-flex;align-items:center;min-height:40px;
  text-decoration:none;border-bottom:1px solid var(--ink);
}

/* ---------- 动效 ---------- */
.reveal{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .75s cubic-bezier(.2,.7,.3,1),transform .75s cubic-bezier(.2,.7,.3,1);
}
.reveal.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .hero-media img{transform:none}
}

/* ---------- 窄屏 ---------- */
@media (max-width:900px){
  .wrap{grid-template-columns:1fr;gap:34px}
  .rail{
    position:static;
    border-left:0;border-top:1px solid var(--ink);
    padding:22px 0 0;
  }
  .rail-list{columns:2;column-gap:22px}
  .rail-list li{break-inside:avoid}
  .foot-cols{grid-template-columns:1fr 1fr}
}

@media (max-width:600px){
  body{font-size:17px}
  .hero{min-height:calc(100svh - 112px)}
  .hero::after{background:linear-gradient(180deg,rgba(255,255,255,.94) 0%,rgba(255,255,255,.72) 60%,rgba(255,255,255,.35) 100%)}
  .hero-copy{padding:44px var(--gut)}
  .prose{font-size:17px}
  .prose article:first-of-type > p:first-of-type::first-letter{font-size:3em}
  .foot-cols{grid-template-columns:1fr}
  .foot-base{flex-direction:row;justify-content:space-between}
}
</style_placeholder>

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