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

:root{
  --neon:#00ff80;
  --blue:#0000ff;
  --ink:#000000;
  --paper:#ffffff;
  --ash:#f1f1f1;
  --serif:'Libre Bodoni',Georgia,'Songti SC','SimSun',serif;
  --sans:'Public Sans',system-ui,-apple-system,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
}

*,*::before,*::after{box-sizing:border-box;border-radius:0;}

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

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:1.0625rem;
  line-height:1.75;
  overflow-x:hidden;
}

img{display:block;max-width:100%;height:auto;}
a{color:inherit;text-decoration:none;}
h1,h2,h3{font-family:var(--serif);font-weight:700;line-height:1.15;letter-spacing:-.01em;}
p{margin:0 0 1.1rem;}

/* 顶栏 */
.masthead{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  background:var(--ink);
  color:var(--paper);
  padding:.65rem .8rem;
  border-bottom:3px solid var(--ink);
}

.mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:46px;
  height:46px;
  flex:0 0 auto;
  background:var(--neon);
  color:var(--ink);
  border:3px solid var(--neon);
  font-family:var(--serif);
  font-weight:700;
  font-size:1.35rem;
  line-height:1;
}
.mark img{width:100%;height:100%;object-fit:cover;}
.mark:hover{background:var(--paper);border-color:var(--paper);}
.mark.small{width:40px;height:40px;font-size:1.1rem;}

.cta{
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:0 1.15rem;
  background:var(--blue);
  color:#ffffff;
  border:3px solid #ffffff;
  font-weight:700;
  font-size:1rem;
  letter-spacing:.04em;
}
.cta:hover{background:var(--neon);color:var(--ink);border-color:var(--neon);}

/* 粘性锚点条 */
.rail{
  position:sticky;
  top:0;
  z-index:40;
  background:var(--ink);
  border-bottom:3px solid var(--ink);
  overflow-x:auto;
  overflow-y:hidden;
}
.rail ol{
  display:flex;
  gap:.4rem;
  margin:0;
  padding:.5rem .7rem;
  list-style:none;
  width:max-content;
}
.rail a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 .85rem;
  border:2px solid #ffffff;
  color:#ffffff;
  font-weight:600;
  font-size:1rem;
  white-space:nowrap;
}
.rail a:hover,.rail a[aria-current="true"]{background:var(--neon);border-color:var(--neon);color:var(--ink);}

/* 首屏 */
.hero{
  display:grid;
  grid-template-columns:1.1fr .9fr;
  align-items:center;
  gap:2rem;
  min-height:100vh;
  padding:3rem 1.5rem;
  background-color:var(--ink);
  background-image:radial-gradient(var(--neon) 1.3px,transparent 1.3px);
  background-size:16px 16px;
  color:#ffffff;
}
.hero-text{max-width:34ch;margin:0 auto;text-align:center;}
.kicker{
  display:inline-block;
  margin:0 0 1rem;
  padding:.15rem .7rem;
  background:var(--neon);
  color:var(--ink);
  border:3px solid var(--neon);
  font-weight:700;
  font-size:1rem;
  letter-spacing:.05em;
}
.hero h1{
  margin:0;
  font-size:clamp(2.1rem,1.4rem + 4.2vw,4.6rem);
  color:var(--neon);
  text-shadow:4px 4px 0 var(--blue);
  word-break:break-word;
}
.hero-art{
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:230px;
  border:3px solid var(--neon);
  background:rgba(0,0,0,.4);
}
.hero-art img{width:100%;height:100%;max-height:64vh;object-fit:cover;}

/* 主区网格 */
.wrap{
  display:grid;
  grid-template-columns:minmax(0,1fr) 300px;
  gap:2.5rem;
  align-items:start;
  max-width:1240px;
  margin:0 auto;
  padding:3rem 1.5rem 4.5rem;
}
.main-col{min-width:0;}

.side{
  position:sticky;
  top:88px;
  border:3px solid var(--ink);
  background:var(--ash);
  padding:1rem;
}
.side h2{margin:0;font-size:1.35rem;}
.subtitle{
  margin:.35rem 0 .9rem;
  padding-bottom:.6rem;
  border-bottom:3px solid var(--ink);
  font-size:1rem;
  font-weight:600;
  color:var(--blue);
}
.side ol{margin:0;padding:0;list-style:none;counter-reset:side;}
.side li{counter-increment:side;border-top:2px solid var(--ink);}
.side li:first-child{border-top:0;}
.side a{
  display:flex;
  align-items:center;
  gap:.6rem;
  min-height:44px;
  padding:.25rem .2rem;
  font-size:1rem;
  font-weight:600;
}
.side a::before{
  content:counter(side,decimal-leading-zero);
  font-family:var(--serif);
  font-size:.95rem;
  color:var(--blue);
}
.side a:hover{background:var(--neon);}

/* 正文 */
.prose{max-width:70ch;font-size:1.0625rem;}
.prose section{
  border-top:3px solid var(--ink);
  padding:2.6rem 0 1rem;
  scroll-margin-top:104px;
}
.prose section:first-child{border-top:0;padding-top:0;}
.prose h2{font-size:clamp(1.5rem,1.1rem + 1.5vw,2.1rem);margin:0 0 .55rem;}
.prose h2::after{content:"";display:block;width:72px;height:9px;background:var(--neon);margin:.55rem 0 0;}
.prose h3{font-size:1.3rem;margin:1.6rem 0 .5rem;}
.prose p,.prose li{line-height:1.8;}
.prose ul,.prose ol{padding-left:1.35rem;margin:0 0 1.2rem;}
.prose li{margin:0 0 .5rem;}
.prose a{border-bottom:3px solid var(--neon);font-weight:600;}
.prose a:hover{background:var(--neon);}
.prose strong{background:var(--neon);padding:0 .18em;}
.prose time{display:inline-block;border:2px solid var(--ink);padding:0 .45rem;font-size:.95rem;font-weight:600;}
.prose blockquote{margin:1.4rem 0;padding:.9rem 1.1rem;border-left:9px solid var(--blue);background:var(--ash);}
.prose blockquote p:last-child{margin:0;}
.prose img{border:3px solid var(--ink);margin:1.2rem 0;}
.prose figure{margin:1.2rem 0;}
.prose hr{border:0;border-top:3px solid var(--ink);margin:2rem 0;}
.prose code{background:var(--ash);border:2px solid var(--ink);padding:0 .3em;font-size:.95em;}
.prose table{display:block;width:100%;overflow-x:auto;border-collapse:collapse;margin:1.2rem 0;font-size:1rem;}
.prose th,.prose td{border:2px solid var(--ink);padding:.5rem .6rem;text-align:left;}
.prose th{background:var(--neon);}

/* 回到顶部 */
.to-top{
  position:fixed;
  right:1rem;
  bottom:1rem;
  z-index:50;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:0 1rem;
  background:var(--ink);
  color:var(--neon);
  border:3px solid var(--neon);
  font-weight:700;
  font-size:1rem;
}
.to-top:hover{background:var(--neon);color:var(--ink);}

/* 页脚 */
.foot{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:1rem 1.5rem;
  background:var(--ink);
  color:#ffffff;
  border-top:10px solid var(--neon);
  padding:1.4rem 1.5rem 5.5rem;
}
.foot-brand{display:flex;align-items:center;gap:.8rem;}
.foot-name{margin:0;font-family:var(--serif);font-weight:700;font-size:1.15rem;color:var(--neon);}
.foot-nav ol{display:flex;flex-wrap:wrap;gap:.4rem;margin:0;padding:0;list-style:none;}
.foot-nav a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 .7rem;
  border:2px solid #ffffff;
  font-size:1rem;
}
.foot-nav a:hover{background:var(--neon);border-color:var(--neon);color:var(--ink);}
.foot-legal p{margin:0;font-size:1rem;}

/* 滚动显现：无过渡，瞬时 */
.js .prose section{opacity:0;transform:translateY(20px);}
.js .prose section.in{opacity:1;transform:none;}

@media (max-width:900px){
  .wrap{grid-template-columns:1fr;gap:1.75rem;padding:2.5rem 1.1rem 3.5rem;}
  .side{position:static;order:2;}
  .hero{grid-template-columns:1fr;min-height:auto;padding:2.4rem 1.1rem 3rem;gap:1.5rem;}
  .hero h1{font-size:clamp(1.9rem,1.2rem + 5vw,3.1rem);text-shadow:3px 3px 0 var(--blue);}
  .hero-art{min-height:180px;}
  .masthead{padding:.55rem .65rem;}
  .rail a{padding:0 .7rem;}
}

@media (max-width:600px){
  .foot{flex-direction:column;align-items:flex-start;}
  .prose section{padding:2rem 0 .6rem;scroll-margin-top:92px;}
  .to-top{right:.6rem;bottom:.6rem;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .js .prose section{opacity:1;transform:none;}
}

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