:root{
  --ink:#000;
  --paper:#fff;
  --soft:#efefef;
  --mute:#3b3b3b;
  --hair:#8d8d8d;
  --serif:"Crimson Pro",Georgia,"Songti SC","Noto Serif SC",serif;
  --sans:"Atkinson Hyperlegible",-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;
  --r:18px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.68;
}
img{display:block;max-width:100%;height:auto}
figure{margin:0}
a{color:inherit}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.12;letter-spacing:-.015em;margin:0 0 .5em}
p{margin:0 0 1em}
:focus-visible{outline:2px solid var(--ink);outline-offset:3px}

/* 报头 */
.masthead{
  border-bottom:2px solid var(--ink);
  background:var(--paper);
  padding:12px 18px 10px;
}
.brandline{display:flex;justify-content:center}
.logo{
  display:inline-block;
  font-family:var(--serif);
  font-size:clamp(1.3rem,3.6vw,2.05rem);
  letter-spacing:.16em;
  text-decoration:none;
  padding:6px 6px 2px;
  line-height:1.2;
}
.logo-mark{width:auto;height:30px;object-fit:contain}

.nav{
  display:flex;
  align-items:center;
  gap:10px;
  margin-top:10px;
  padding-top:10px;
  border-top:1px solid var(--ink);
}
.nav p{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:7px;
  margin:0;
  flex:1 1 auto;
  min-width:0;
}
.nav p a,
.cta{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:9px 15px;
  border:1px solid var(--ink);
  border-radius:999px;
  font-size:.95rem;
  line-height:1.35;
  text-decoration:none;
  white-space:nowrap;
  transition:background .18s ease,color .18s ease,transform .18s ease;
}
.nav p a:hover,
.nav p a:focus-visible{background:var(--ink);color:var(--paper);transform:translateY(-1px)}
.cta{
  background:var(--ink);
  color:var(--paper);
  flex:0 0 auto;
}
.cta:hover,.cta:focus-visible{background:var(--paper);color:var(--ink)}

/* 结构 */
.wrap{
  max-width:1220px;
  margin:0 auto;
  padding:24px 18px 56px;
  display:grid;
  grid-template-columns:1fr;
  gap:26px;
}
.stage{order:1;min-width:0}
.rail{order:2}

/* 侧栏 */
.rail{
  border-top:3px solid var(--ink);
  padding-top:14px;
}
.rail-brand{
  font-size:1.12rem;
  letter-spacing:.08em;
  margin:0 0 6px;
}
.subtitle{
  margin:0 0 14px;
  font-size:.95rem;
  line-height:1.6;
  color:var(--mute);
}
.rail-list{
  list-style:none;
  margin:0;
  padding:0;
  counter-reset:railc;
  border-top:1px solid var(--ink);
}
.rail-list li{
  counter-increment:railc;
  border-bottom:1px solid var(--ink);
}
.rail-list a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:42px;
  padding:9px 10px;
  text-decoration:none;
  font-size:.97rem;
  border-radius:12px;
  transition:background .18s ease,color .18s ease;
}
.rail-list a::before{
  content:counter(railc,decimal-leading-zero);
  font-family:var(--serif);
  font-size:.86rem;
  letter-spacing:.06em;
  opacity:.7;
}
.rail-list a:hover,.rail-list a:focus-visible{background:var(--ink);color:var(--paper)}

/* 头图 */
.hero{
  display:grid;
  gap:18px;
  padding-bottom:28px;
  border-bottom:2px solid var(--ink);
}
.hero-copy{order:-1}
.hero-copy h1{
  margin:0;
  font-size:clamp(2rem,7.6vw,4.3rem);
  line-height:1.03;
}
.hero-plate{
  position:relative;
  min-height:236px;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px;
  align-content:start;
}
.shot{
  display:block;
  position:relative;
  border-radius:var(--r);
  overflow:hidden;
  border:1px solid var(--ink);
  background:var(--soft);
}
.shot-img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(1) contrast(1.06);
  transition:transform .5s ease,filter .5s ease;
}
.shot-a{aspect-ratio:4/5}
.shot-b{aspect-ratio:3/4;align-self:end;margin-top:26px}
.stamp{
  position:absolute;
  left:8px;
  bottom:8px;
  z-index:3;
  background:var(--ink);
  color:var(--paper);
  border-radius:999px;
  min-height:40px;
  display:inline-flex;
  align-items:center;
  padding:8px 15px;
  font-size:.85rem;
  letter-spacing:.1em;
  text-decoration:none;
}

/* 正文 */
.post-body{min-width:0}
.post-body > div{
  border-top:2px solid var(--ink);
  padding-top:22px;
  margin-top:34px;
  scroll-margin-top:120px;
}
.post-body > div:first-of-type{
  border-top:0;
  padding-top:26px;
  margin-top:0;
}
.post-body h2{
  font-size:clamp(1.5rem,4.8vw,2.4rem);
  margin:0 0 .55em;
}
.post-body h3{
  font-size:1.22rem;
  margin:1.4em 0 .5em;
  letter-spacing:0;
}
.post-body > div > p:first-of-type::first-letter{
  float:left;
  font-family:var(--serif);
  font-weight:700;
  font-size:3.5em;
  line-height:.84;
  padding:.04em .1em 0 0;
}
.post-body p{color:#111}
.post-body a{text-decoration:underline;text-underline-offset:3px}
.post-body a:hover{background:var(--ink);color:var(--paper);text-decoration:none}
.post-body ul,.post-body ol{padding-left:1.15em;margin:0 0 1.1em}
.post-body li{margin:.35em 0}
.post-body blockquote{
  margin:22px 0;
  padding:8px 0 8px 18px;
  border-left:4px solid var(--ink);
  font-family:var(--serif);
  font-size:1.28rem;
  line-height:1.45;
}
.post-body blockquote p:last-child{margin-bottom:0}
.post-body figure{margin:22px 0}
.post-body figcaption{
  font-size:.85rem;
  letter-spacing:.06em;
  color:var(--mute);
  padding-top:8px;
  border-bottom:1px solid var(--ink);
}
.post-body table{width:100%;border-collapse:collapse;margin:0 0 1.2em;font-size:.96rem}
.post-body th,.post-body td{border-bottom:1px solid var(--ink);padding:9px 6px;text-align:left}
.post-body code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:.92em;
  background:var(--soft);
  padding:.1em .35em;
  border-radius:5px;
}

/* 页脚 */
.colophon{
  border-top:2px solid var(--ink);
  margin-top:20px;
  padding:28px 18px 40px;
}
.foot-grid{
  max-width:1220px;
  margin:0 auto;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:26px;
}
.foot-grid dl{margin:0}
.foot-grid dt{
  font-size:.78rem;
  letter-spacing:.2em;
  padding-bottom:8px;
  border-bottom:1px solid var(--ink);
}
.foot-grid dd{
  margin:8px 0 0;
  display:flex;
  flex-direction:column;
  gap:1px;
  font-size:.95rem;
}
.foot-grid dd a{
  display:flex;
  align-items:center;
  min-height:40px;
  text-decoration:none;
}
.foot-grid dd a:hover,.foot-grid dd a:focus-visible{text-decoration:underline}
.foot-brand{display:flex;align-items:center;min-height:40px;font-family:var(--serif);letter-spacing:.06em}
.sub{margin:0;min-width:0}
.sub-label{
  display:block;
  font-size:.78rem;
  letter-spacing:.2em;
  padding-bottom:8px;
  border-bottom:1px solid var(--ink);
}
.sub-row{display:flex;gap:8px;margin-top:10px}
.sub-row input{
  flex:1 1 auto;
  min-width:0;
  min-height:42px;
  padding:8px 13px;
  border:1px solid var(--ink);
  border-radius:999px;
  background:var(--paper);
  color:var(--ink);
  font:inherit;
  font-size:.95rem;
}
.sub-row button{
  flex:0 0 auto;
  min-height:42px;
  padding:8px 17px;
  border:1px solid var(--ink);
  border-radius:999px;
  background:var(--ink);
  color:var(--paper);
  font:inherit;
  font-size:.95rem;
  cursor:pointer;
  transition:background .18s ease,color .18s ease;
}
.sub-row button:hover{background:var(--paper);color:var(--ink)}
.copy{
  max-width:1220px;
  margin:26px auto 0;
  padding-top:12px;
  border-top:1px solid var(--hair);
  font-size:.85rem;
  color:var(--mute);
}

/* 滚动显现 */
.js .reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .62s ease,transform .62s ease;
}
.js .reveal.in{opacity:1;transform:none}

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

@media (min-width:820px){
  .foot-grid{grid-template-columns:1fr 1fr 1fr 1.3fr;gap:34px}
}

@media (min-width:960px){
  .masthead{position:sticky;top:0;z-index:30;padding:14px 26px 10px}
  .nav p a:nth-child(4){margin-left:auto}
  .wrap{
    grid-template-columns:248px minmax(0,1fr);
    gap:48px;
    padding:40px 26px 72px;
    align-items:start;
  }
  .rail{order:1;position:sticky;top:152px}
  .stage{order:2}
  .hero{
    grid-template-columns:1.12fr .88fr;
    gap:38px;
    min-height:66vh;
    align-items:center;
    padding-bottom:38px;
  }
  .hero-copy{order:0;text-align:right}
  .hero-copy h1{text-align:right}
  .hero-plate{min-height:52vh;display:block}
  .shot{position:absolute}
  .shot-a{left:0;top:0;width:68%;aspect-ratio:4/5}
  .shot-b{right:0;bottom:0;width:48%;aspect-ratio:3/4;margin-top:0;box-shadow:16px 16px 0 var(--paper)}
  .stamp{left:-8px;top:46%;bottom:auto}
  .post-body > div{scroll-margin-top:160px}
}

@media (min-width:1140px){
  .post-body > div{
    column-count:2;
    column-gap:2.9rem;
  }
  .post-body > div > *{break-inside:avoid}
  .post-body > div:first-of-type{column-count:2}
}

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