@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Orbitron:wght@700;900&display=swap');

:root{
  --neon:#87ff71;
  --sun:#ffce5c;
  --ink:#192617;
  --bg:#0c1410;
  --panel:#17251b;
  --line:#32472f;
  --txt:#e8f6e5;
  --muted:#a6c4a1;
  --railw:184px;
  --r:28px;
  --disp:"Orbitron","JetBrains Mono",ui-sans-serif,system-ui,"PingFang SC","Microsoft YaHei",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --fade:.18s ease;
}

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

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

body{
  margin:0;
  background-color:var(--bg);
  background-image:radial-gradient(rgba(135,255,113,.11) 1px,transparent 1px);
  background-size:24px 24px;
  color:var(--txt);
  font:17px/1.7 system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}

::selection{background:var(--sun);color:var(--ink)}

img{max-width:100%}

.sr{
  position:absolute;width:1px;height:1px;
  clip-path:inset(50%);overflow:hidden;white-space:nowrap;
}

/* ---------- 左侧竖排导航 ---------- */
.rail{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--railw);
  z-index:30;
  display:flex;
  flex-direction:column;
  gap:20px;
  padding:20px 14px 28px;
  background:var(--ink);
  border-right:3px solid var(--neon);
  overflow-y:auto;
}
.rail::after{
  content:"";
  position:absolute;
  right:-3px;
  bottom:0;
  width:6px;
  height:42%;
  background:repeating-linear-gradient(180deg,var(--sun) 0 12px,transparent 12px 26px);
  pointer-events:none;
}

.mark{
  flex:0 0 auto;
  width:44px;height:44px;
  display:grid;place-items:center;
  border:3px solid var(--ink);
  border-radius:14px;
  background:var(--neon);
  transform:rotate(-7deg);
  transition:transform var(--fade);
}
.mark:hover,.mark:focus-visible{transform:rotate(4deg) scale(1.06)}
.mark-img{width:100%;height:100%;object-fit:contain;border-radius:10px}
.mark-shape{
  width:18px;height:18px;
  background:var(--ink);
  clip-path:polygon(50% 0,100% 100%,0 100%);
}

.rail-nav{
  display:flex;
  flex-direction:column;
  gap:6px;
  counter-reset:nav;
}
.rail-nav a{
  position:relative;
  display:block;
  padding:11px 10px 11px 42px;
  min-height:44px;
  color:var(--txt);
  text-decoration:none;
  font-size:1rem;
  line-height:1.4;
  border:2px solid transparent;
  border-radius:16px;
  transition:background var(--fade),color var(--fade),border-color var(--fade);
}
.rail-nav a::before{
  counter-increment:nav;
  content:counter(nav,decimal-leading-zero);
  position:absolute;
  left:12px;
  top:13px;
  font-family:var(--mono);
  font-size:.82rem;
  color:var(--sun);
  letter-spacing:.04em;
}
.rail-nav a:hover,
.rail-nav a:focus-visible,
.rail-nav a[aria-current]{
  background:var(--neon);
  color:var(--ink);
  border-color:var(--ink);
  outline:none;
}
.rail-nav a:hover::before,
.rail-nav a[aria-current]::before{color:var(--ink)}

/* ---------- 主区 ---------- */
main{
  margin-left:var(--railw);
  min-height:100vh;
}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  min-height:100vh;
  min-height:100svh;
  display:grid;
  place-items:center;
  overflow:hidden;
  margin-bottom:6px;
  background:
    radial-gradient(70% 60% at 20% 10%,rgba(135,255,113,.22),transparent 70%),
    radial-gradient(60% 60% at 85% 80%,rgba(255,206,92,.2),transparent 70%),
    var(--ink);
  clip-path:polygon(0 0,100% 0,100% 91%,0 100%);
}
.hero-img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:.5;
  filter:saturate(1.15) contrast(1.05);
  transform:scale(1.06);
  will-change:transform;
}
.hero h1{
  position:relative;
  z-index:2;
  margin:0;
  padding:0 22px;
  max-width:22ch;
  text-align:center;
  font-family:var(--disp);
  font-weight:900;
  font-size:clamp(2.1rem,7.5vw,5rem);
  line-height:1.08;
  letter-spacing:.01em;
  color:var(--sun);
  text-shadow:4px 4px 0 var(--ink),8px 8px 0 rgba(135,255,113,.55);
}

/* ---------- 内容布局 ---------- */
.wrap{
  display:grid;
  grid-template-columns:214px minmax(0,1fr);
  gap:44px;
  max-width:1180px;
  margin:0 auto;
  padding:64px 34px 40px;
}

.note{
  position:sticky;
  top:36px;
  align-self:start;
  padding:22px 20px 20px;
  background:var(--panel);
  border:3px solid var(--neon);
  border-radius:var(--r);
  transform:rotate(-1.1deg);
  box-shadow:9px 9px 0 rgba(255,206,92,.16);
}
.note h2{
  margin:0 0 8px;
  font-family:var(--disp);
  font-size:1.12rem;
  line-height:1.3;
  color:var(--neon);
  letter-spacing:.02em;
}
.note .subtitle{
  margin:0 0 16px;
  color:var(--muted);
  font-size:1rem;
  line-height:1.65;
  border-top:2px dotted var(--line);
  padding-top:12px;
}
.to-top{
  display:inline-block;
  padding:11px 16px;
  min-height:44px;
  border:2px solid var(--sun);
  border-radius:14px;
  color:var(--sun);
  text-decoration:none;
  font-size:1rem;
  transition:background var(--fade),color var(--fade),transform var(--fade);
}
.to-top:hover,.to-top:focus-visible{
  background:var(--sun);
  color:var(--ink);
  transform:rotate(-2deg);
  outline:none;
}

.doc{min-width:0}

/* ---------- 正文 ---------- */
.prose{
  max-width:788px;
  font-size:1.06rem;
  line-height:1.8;
}
.prose div{
  padding:42px 0;
  border-top:3px dotted var(--line);
  scroll-margin-top:88px;
}
.prose div:first-child{border-top:0;padding-top:0}

.prose h2{
  font-family:var(--disp);
  font-size:clamp(1.45rem,3vw,2.05rem);
  line-height:1.25;
  color:var(--sun);
  margin:0 0 6px;
  padding-bottom:12px;
  border-bottom:3px dashed var(--line);
  letter-spacing:.01em;
}
.prose h2 + p,
.prose h2 + .subtitle{
  margin-top:14px;
  color:var(--neon);
  font-size:1.02rem;
}
.prose h3{
  font-family:var(--disp);
  font-size:1.24rem;
  line-height:1.35;
  color:var(--neon);
  margin:30px 0 8px;
}
.prose p{margin:0 0 16px;max-width:68ch}
.prose ul,.prose ol{margin:0 0 18px;padding-left:22px;max-width:66ch}
.prose li{margin:0 0 8px}
.prose li::marker{color:var(--neon)}

.prose a{
  color:var(--neon);
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:3px;
  transition:background var(--fade),color var(--fade);
}
.prose a:hover,.prose a:focus-visible{
  background:var(--sun);
  color:var(--ink);
  outline:none;
}

.prose img{
  display:block;
  margin:24px 0;
  height:auto;
  border:3px solid var(--line);
  border-radius:var(--r);
}
.prose blockquote{
  margin:24px 0;
  padding:16px 20px;
  background:var(--panel);
  border-left:7px solid var(--neon);
  border-radius:0 var(--r) var(--r) 0;
  color:var(--muted);
}
.prose blockquote p:last-child{margin-bottom:0}

.prose table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 20px;
  font-size:1rem;
}
.prose th,.prose td{
  border:2px dotted var(--line);
  padding:10px 12px;
  text-align:left;
}
.prose th{background:var(--panel);color:var(--sun)}

.prose strong{color:var(--sun)}
.prose code{
  font-family:var(--mono);
  font-size:.94em;
  background:var(--panel);
  border:2px dotted var(--line);
  border-radius:8px;
  padding:1px 6px;
}

/* ---------- 页脚 ---------- */
.site-foot{
  position:relative;
  margin-top:56px;
  padding:52px 34px 22px;
  background:var(--ink);
  border-top:3px solid var(--sun);
  clip-path:polygon(0 26px,100% 0,100% 100%,0 100%);
}
.foot-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:38px;
  max-width:1120px;
  margin:0 auto;
}
.site-foot dl{margin:0}
.site-foot dt{
  color:var(--sun);
  font-size:1rem;
  letter-spacing:.06em;
  border-bottom:2px dotted var(--line);
  padding-bottom:6px;
}
.site-foot dd{margin:6px 0 14px;color:var(--muted);font-size:1rem}

.foot-nav dd a{
  display:inline-block;
  padding:8px 0;
  min-height:40px;
  color:var(--neon);
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:3px;
  transition:color var(--fade),background var(--fade);
}
.foot-nav dd a:hover,.foot-nav dd a:focus-visible{
  background:var(--neon);
  color:var(--ink);
  outline:none;
}

.sub-form{display:flex;flex-wrap:wrap;gap:10px}
.sub-form input{
  flex:1 1 130px;
  min-width:0;
  padding:11px 13px;
  font:inherit;
  font-size:1rem;
  color:var(--txt);
  background:#101b12;
  border:3px solid var(--line);
  border-radius:14px;
}
.sub-form input::placeholder{color:var(--muted)}
.sub-form input:focus{outline:none;border-color:var(--neon)}
.sub-form button{
  flex:0 0 auto;
  padding:11px 20px;
  min-height:44px;
  font:inherit;
  font-size:1rem;
  font-weight:700;
  color:var(--ink);
  background:var(--neon);
  border:3px solid var(--ink);
  border-radius:14px;
  cursor:pointer;
  transition:transform var(--fade),background var(--fade);
}
.sub-form button:hover,.sub-form button:focus-visible{
  background:var(--sun);
  transform:rotate(-3deg);
  outline:none;
}

.foot-base{
  max-width:1120px;
  margin:34px auto 0;
  padding-top:16px;
  border-top:2px dotted var(--line);
  text-align:center;
  color:var(--muted);
  font-size:1rem;
}

/* ---------- 桌面窄屏 ---------- */
@media (max-width:1100px){
  .wrap{grid-template-columns:180px minmax(0,1fr);gap:30px;padding:52px 24px 30px}
}

/* ---------- 移动端 ---------- */
@media (max-width:900px){
  .rail{
    position:sticky;
    inset:0 0 auto 0;
    width:100%;
    flex-direction:row;
    align-items:center;
    gap:10px;
    padding:10px 12px;
    border-right:0;
    border-bottom:3px solid var(--neon);
    overflow-x:auto;
    overflow-y:hidden;
    -webkit-overflow-scrolling:touch;
  }
  .rail::after{display:none}
  .mark{width:40px;height:40px;border-radius:12px}
  .rail-nav{
    flex-direction:row;
    gap:8px;
    counter-reset:nav;
  }
  .rail-nav a{
    white-space:nowrap;
    flex:0 0 auto;
    padding:10px 14px 10px 34px;
    min-height:44px;
    border-radius:14px;
  }
  .rail-nav a::before{top:12px;left:11px}

  main{margin-left:0}

  .hero{min-height:78svh;clip-path:polygon(0 0,100% 0,100% 94%,0 100%)}
  .hero h1{font-size:clamp(1.9rem,8.5vw,3rem)}

  .wrap{
    display:block;
    padding:34px 18px 26px;
  }
  .note{
    position:static;
    transform:rotate(-.8deg);
    margin-bottom:30px;
    box-shadow:6px 6px 0 rgba(255,206,92,.16);
  }
  .prose{max-width:none}
  .prose div{scroll-margin-top:78px}

  .site-foot{padding:40px 18px 20px;clip-path:polygon(0 18px,100% 0,100% 100%,0 100%)}
  .foot-grid{grid-template-columns:1fr;gap:26px}
  .foot-base{margin-top:26px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none !important;animation:none !important}
  .hero-img{transform:none}
  .mark,.note{transform:none}
}

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