@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,400;0,500;1,400&display=swap');

:root{
  --neon:#00ff80;
  --blue:#0000ff;
  --ink:#000;
  --dim:rgba(0,255,128,.34);
  --soft:#dcffef;
}
*,*::before,*::after{box-sizing:border-box}
html{background:#000;scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;padding-left:254px;
  background:#000;color:var(--neon);
  font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  font-size:17px;line-height:1.72;
  background-image:radial-gradient(rgba(0,255,128,.15) 1px,transparent 1px);
  background-size:20px 20px;
  overflow-x:hidden;
}
a{color:var(--neon);transition:none}
img{display:block;max-width:100%;height:auto;border:3px solid var(--neon)}
h1,h2,h3,h4{font-weight:700;line-height:1.1;letter-spacing:-.02em}
p{margin:0 0 1em}
:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
section[id]{scroll-margin-top:18px}

/* ---- 侧栏 ---- */
.rail{
  position:fixed;top:0;left:0;bottom:0;width:254px;z-index:40;
  display:flex;flex-direction:column;gap:12px;
  padding:14px 14px 16px;
  background:#000;border-right:3px solid var(--neon);
}
.brand{
  display:flex;align-items:center;gap:9px;
  min-height:48px;padding:8px 10px;
  background:var(--neon);color:#000;text-decoration:none;
  border:3px solid var(--neon);font-weight:700;font-size:17px;
  letter-spacing:-.03em;line-height:1.2;
}
.brand .mark{
  display:grid;place-items:center;flex:0 0 22px;width:22px;height:22px;
  font-size:16px;line-height:1;border:0;
}
.brand:hover{background:#fff;border-color:#fff}
.menu-btn{
  display:none;font:inherit;font-weight:700;font-size:16px;
  background:#000;color:var(--neon);border:3px solid var(--neon);
  padding:8px 12px;min-height:44px;cursor:pointer;
}
.menu-btn:hover{background:var(--neon);color:#000}
.rail nav{
  flex:1 1 auto;overflow-y:auto;
  margin:0 -14px;padding:0 14px;border-top:2px solid var(--dim);
}
.rail nav ul{list-style:none;margin:0;padding:6px 0}
.rail nav li+li{border-top:1px dashed var(--dim)}
.rail nav a{
  display:flex;align-items:center;gap:10px;
  min-height:46px;padding:8px 4px;
  color:var(--neon);text-decoration:none;font-size:16px;
}
.rail nav a:hover,.rail nav a:focus-visible{background:var(--neon);color:#000}
.rail nav .mk{
  flex:0 0 auto;font-size:12px;letter-spacing:.04em;
  background:var(--neon);color:#000;padding:2px 4px;
}
.rail nav a:hover .mk{background:#000;color:var(--neon)}
.rail .cta{
  display:flex;align-items:center;justify-content:center;
  min-height:48px;padding:10px;
  background:var(--blue);color:#fff;border:3px solid var(--neon);
  text-decoration:none;font-weight:700;font-size:16px;letter-spacing:-.02em;
  text-align:center;
}
.rail .cta:hover{background:var(--neon);color:#000}

/* ---- 首屏 ---- */
.hero{
  min-height:100vh;display:grid;grid-template-columns:1.05fr .95fr;
  gap:30px;align-items:center;align-content:center;
  padding:clamp(26px,5vw,64px);
  border-bottom:4px solid var(--neon);
}
.h1wrap{margin:0 0 20px}
.hero h1{
  display:inline;margin:0;
  background:var(--neon);color:#000;
  font-size:clamp(30px,5.4vw,62px);
  padding:.05em .18em;
  -webkit-box-decoration-break:clone;box-decoration-break:clone;
}
.hero .lead{max-width:32em;margin:0;color:var(--soft);font-size:17px}
.hero .jump-top{
  display:inline-flex;align-items:center;gap:8px;
  margin-top:24px;min-height:46px;padding:10px 18px;
  background:#000;color:var(--neon);border:3px solid var(--neon);
  text-decoration:none;font-weight:700;
}
.hero .jump-top::after{content:"↓"}
.hero .jump-top:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.collage{
  margin:0;display:grid;grid-template-columns:1fr 1fr;gap:12px;align-items:start;
}
.collage .shot{width:100%;filter:grayscale(1) contrast(1.2);border:4px solid var(--blue)}
.collage .shot:first-child{border-color:var(--neon);transform:translateY(-14px)}
.collage .shot:last-child{transform:translateY(22px)}
.collage .pattern{
  grid-column:1/-1;height:270px;border:4px solid var(--neon);
  background-image:radial-gradient(rgba(0,255,128,.55) 1px,transparent 1px);
  background-size:12px 12px;
}

/* ---- 正文 ---- */
.stream{padding:clamp(22px,4vw,54px) clamp(20px,4vw,54px) clamp(30px,5vw,64px);border-bottom:4px solid var(--neon)}
.stream-inner{max-width:64ch}
.stream-inner>section{padding:clamp(18px,3vw,34px) 0;border-top:2px dashed var(--dim)}
.stream-inner>section:first-child{border-top:0;padding-top:0}
.stream-inner h2{
  font-size:clamp(23px,3.3vw,34px);color:#fff;
  margin:0 0 .55em;padding-left:14px;border-left:9px solid var(--blue);
}
.stream-inner h3{font-size:20px;color:var(--neon);margin:1.7em 0 .5em}
.stream-inner p,.stream-inner li{color:var(--soft)}
.stream-inner ul,.stream-inner ol{padding-left:1.4em;margin:0 0 1em}
.stream-inner li{margin:.4em 0}
.stream-inner li::marker{color:var(--blue)}
.stream-inner strong{color:#fff;background:var(--blue);padding:0 .22em}
.stream-inner a{color:var(--neon);text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}
.stream-inner a:hover{background:var(--neon);color:#000;text-decoration:none}
.stream-inner blockquote{
  margin:1.5em 0;padding:12px 16px;border:3px solid var(--dim);
  border-left:9px solid var(--neon);background:#050505;
}
.stream-inner blockquote p:last-child{margin:0}
.stream-inner figure{margin:1.5em 0}
.stream-inner img{border:3px solid var(--neon)}
.stream-inner table{width:100%;border-collapse:collapse;margin:1.4em 0;font-size:16px}
.stream-inner th,.stream-inner td{border:2px solid var(--dim);padding:8px 10px;text-align:left}
.stream-inner th{background:#001a0d;color:#fff}
.stream-inner hr{border:0;border-top:2px dashed var(--dim);margin:2em 0}

/* ---- 页脚 ---- */
.foot{border-top:4px solid var(--neon);background:#000}
.foot .cta{
  display:block;padding:clamp(26px,5vw,60px);
  background:var(--blue);border-bottom:4px solid var(--neon);color:#fff;
}
.foot .cta h2{margin:0;color:#fff;font-size:clamp(26px,4.6vw,50px);letter-spacing:-.03em}
.foot .cta .subtitle{margin:12px 0 22px;color:#c8d2ff;font-size:16px}
.foot .cta .jump{
  display:inline-flex;align-items:center;gap:8px;
  min-height:46px;padding:10px 18px;
  background:var(--neon);color:#000;border:3px solid #000;
  text-decoration:none;font-weight:700;
}
.foot .cta .jump::before{content:"↑"}
.foot .cta .jump:hover{background:#fff}
.foot-grid{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:2px solid var(--neon)}
.foot-grid>div{
  min-width:0;padding:20px 18px;border-right:2px solid var(--dim);
  border-bottom:2px solid var(--dim);
}
.foot-grid>div:last-child{border-right:0}
.col-h{
  display:inline-block;margin:0 0 12px;padding:2px 7px;
  background:var(--blue);color:#fff;font-size:15px;letter-spacing:.1em;
}
.foot-nav dl{margin:0;display:grid;gap:0}
.foot-nav dt{margin:0}
.foot-nav dt a,.foot-col ul a{
  display:flex;align-items:center;min-height:40px;padding:6px 4px;
  color:var(--neon);text-decoration:none;font-size:16px;
  border-bottom:1px solid rgba(0,255,128,.2);
}
.foot-nav dd{margin:0;font-size:12px;color:#4fbf90;letter-spacing:.1em}
.foot-nav dt a:hover,.foot-col ul a:hover{background:var(--neon);color:#000}
.foot-col ul{list-style:none;margin:0;padding:0;display:grid;gap:0}
.foot address{font-style:normal;color:var(--soft);font-size:16px;line-height:1.7;word-break:break-word}
.foot .note{margin:0;color:var(--soft);font-size:16px;word-break:break-word}
.foot-base{padding:18px;text-align:center;color:#9fe8c4;font-size:16px}
.foot-base p{margin:0}

/* ---- 动效 ---- */
.rv{opacity:0;transform:translateY(10px);transition:opacity .14s linear,transform .14s linear}
.rv.in{opacity:1;transform:none}

/* ---- 窄屏 ---- */
@media (max-width:959px){
  body{padding-left:0;padding-top:68px}
  .rail{
    top:0;right:0;bottom:auto;left:0;width:100%;height:68px;
    flex-direction:row;align-items:center;gap:10px;
    padding:8px 12px;border-right:0;border-bottom:3px solid var(--neon);
  }
  .brand{flex:0 1 auto;min-width:0;min-height:44px;padding:6px 8px;font-size:15px}
  .brand span:last-child{overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
  .menu-btn{display:block;margin-left:auto;flex:0 0 auto}
  .rail .cta{margin-left:0;flex:0 0 auto;min-height:44px;padding:6px 10px;font-size:14px}
  .rail nav{
    position:fixed;left:0;right:0;top:68px;display:none;
    flex:0 0 auto;max-height:calc(100vh - 68px);overflow:auto;
    margin:0;padding:6px 0;border-top:0;border-bottom:3px solid var(--neon);
    background:#000;
  }
  .rail.open nav{display:block}
  .rail nav ul{padding:0}
  .rail nav li+li{border-top:1px solid var(--dim)}
  .rail nav a{min-height:48px;padding:10px 16px}
  .hero{grid-template-columns:1fr;min-height:0;gap:22px;padding:24px 16px 34px}
  .hero h1{font-size:clamp(27px,7.6vw,40px)}
  .hero .lead{font-size:17px}
  .collage{grid-template-columns:1fr 1fr;gap:8px}
  .collage .pattern{height:180px}
  section[id]{scroll-margin-top:80px}
  .stream{padding:22px 16px 36px}
  .stream-inner{max-width:100%}
  .foot-grid{grid-template-columns:1fr 1fr}
  .foot-grid>div{padding:16px 14px}
  .foot-grid>div:nth-child(2n){border-right:0}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1;transform:none;transition:none}
  *{transition:none!important}
}

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