:root{
  --ng:#87ff71;
  --cy:#01cdfe;
  --pink:#ff71ce;
  --pur:#b967ff;
  --ink:#192617;
  --bg:#0d1710;
  --bg2:#132115;
  --line:rgba(135,255,113,.22);
  --txt:#d9f2cf;
  --dim:#9fbf9b;
  --fs:"Public Sans",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --fd:"Lexend Mega","Public Sans",system-ui,"PingFang SC",sans-serif;
  --bar:74px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:radial-gradient(1200px 520px at 78% -8%,rgba(1,205,254,.16),transparent 62%),var(--bg);
  color:var(--txt);
  font:16px/1.75 var(--fs);
  padding-bottom:calc(var(--bar) + 20px);
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:2;pointer-events:none;
  background:repeating-linear-gradient(180deg,rgba(255,255,255,.035) 0 1px,transparent 1px 3px);
}
body::after{
  content:"";position:fixed;left:0;right:0;bottom:0;height:42vh;z-index:0;pointer-events:none;
  background:
    linear-gradient(transparent,rgba(1,205,254,.07)),
    repeating-linear-gradient(90deg,rgba(135,255,113,.15) 0 1px,transparent 1px 56px),
    repeating-linear-gradient(0deg,rgba(135,255,113,.15) 0 1px,transparent 1px 56px);
  transform:perspective(420px) rotateX(64deg);
  transform-origin:bottom center;
  opacity:.85;
}
img{max-width:100%;height:auto}
main,.foot{position:relative;z-index:1}
a{color:var(--cy)}
a:focus-visible,button:focus-visible{outline:2px solid var(--ng);outline-offset:3px}

/* 底部固定条 */
.bar{
  position:fixed;left:0;right:0;bottom:0;z-index:50;
  display:flex;align-items:center;gap:10px;
  min-height:var(--bar);padding:9px 14px;
  background:rgba(15,25,16,.95);
  border-top:2px solid var(--ng);
  box-shadow:0 -8px 32px rgba(1,205,254,.2);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
}
.brand{
  font-family:var(--fd);font-weight:800;font-size:17px;line-height:1.2;
  color:var(--ng);text-decoration:none;letter-spacing:.03em;white-space:nowrap;
  text-shadow:0 0 12px rgba(135,255,113,.6);
}
.bar-end{margin-left:auto;display:flex;align-items:center;gap:10px}
.contact{display:none;font-size:14px;color:var(--dim);white-space:nowrap}
.contact b{color:var(--cy);font-weight:600}
.menu-btn{
  min-height:44px;padding:8px 18px;font:700 16px/1 var(--fs);
  color:var(--ink);cursor:pointer;border:0;border-radius:4px;
  background:linear-gradient(120deg,var(--ng),var(--cy));
  box-shadow:0 0 18px rgba(135,255,113,.4);
}
.nav{position:absolute;left:0;right:0;bottom:100%}
.nav p{
  display:none;margin:0;padding:12px;
  flex-direction:column;gap:4px;max-height:56vh;overflow:auto;
  background:rgba(12,21,13,.99);
  border-top:2px solid var(--cy);
  box-shadow:0 -10px 26px rgba(0,0,0,.5);
}
.bar.open .nav p{display:flex}
.nav p a{
  display:flex;align-items:center;min-height:44px;padding:8px 12px;
  color:var(--txt);text-decoration:none;font-size:16px;
  border-left:3px solid transparent;border-radius:4px;
}
.nav p a:hover,.nav p a:focus{background:rgba(135,255,113,.12);border-left-color:var(--ng);color:var(--ng)}
.sep{display:block;height:1px;background:var(--line);margin:6px 4px}

/* 首屏 */
.hero{
  position:relative;display:grid;grid-template-columns:1fr;gap:18px;align-items:center;
  max-width:1120px;margin:0 auto;padding:26px 18px 30px;
  min-height:45vh;
  background:linear-gradient(165deg,rgba(255,113,206,.17),rgba(1,205,254,.15) 45%,rgba(185,103,255,.13) 72%,transparent);
  border-bottom:2px solid var(--line);
}
.badge{
  display:inline-block;padding:5px 12px;border-radius:4px;
  font-size:14px;letter-spacing:.16em;
  color:var(--cy);background:rgba(1,205,254,.13);
  border:1px solid rgba(1,205,254,.55);
  box-shadow:0 0 16px rgba(1,205,254,.3);
}
.hero h1{
  margin:12px 0 12px;
  font-family:var(--fd);font-weight:800;
  font-size:clamp(28px,7.2vw,56px);line-height:1.12;letter-spacing:-.01em;
  color:#f4fff1;
  text-shadow:0 0 18px rgba(135,255,113,.55),3px 3px 0 rgba(1,205,254,.45),-3px -3px 0 rgba(255,113,206,.32);
}
.lead{margin:0;font-size:17px;line-height:1.7;color:#cfe6c3;max-width:48ch}
.hero-art{margin:0}
.hero-img{
  display:block;width:100%;border-radius:4px;
  border:2px solid rgba(1,205,254,.55);
  box-shadow:0 0 34px rgba(135,255,113,.28),0 0 0 1px rgba(25,38,23,.9) inset;
  filter:saturate(1.08);
}

/* 正文 + 右aside */
.wrap{
  max-width:1120px;margin:0 auto;padding:0 18px 40px;
  display:grid;grid-template-columns:1fr;gap:34px;
}
div[id]{scroll-margin-top:16px;scroll-margin-bottom:calc(var(--bar) + 18px)}
.content section > div{
  margin:0 0 20px;padding:26px 18px;
  background:linear-gradient(180deg,rgba(135,255,113,.05),rgba(19,33,21,.55));
  border:1px solid var(--line);
  border-bottom:3px solid rgba(135,255,113,.75);
  border-radius:4px;
}
.content section > div:last-child{margin-bottom:0}
.content h2{
  margin:0 0 12px;
  font-family:var(--fd);font-weight:800;
  font-size:clamp(21px,4.4vw,31px);line-height:1.28;
  color:#eeffe7;
  text-shadow:0 0 14px rgba(135,255,113,.35);
}
.content h3{
  margin:24px 0 8px;font-family:var(--fd);font-weight:700;
  font-size:19px;line-height:1.4;color:var(--ng);
}
.content p{margin:0 0 15px;color:#cfe6c3}
.content p:last-child{margin-bottom:0}
.content ul,.content ol{margin:0 0 16px;padding-left:22px}
.content li{margin:6px 0}
.content a{color:var(--cy);text-underline-offset:3px}
.content a:hover{color:var(--ng)}
.content strong{color:#eeffe7}
.content blockquote{
  margin:18px 0;padding:13px 16px;
  border-left:3px solid var(--pink);border-radius:4px;
  background:rgba(255,113,206,.09);
}
.content blockquote p:last-child{margin-bottom:0}
.subtitle{margin:0 0 12px;font-size:14px;color:var(--dim);line-height:1.6}

.rail{display:grid;gap:16px;align-content:start}
.rail-card{
  padding:16px;border-radius:4px;
  border:1px solid var(--line);border-bottom:3px solid var(--cy);
  background:linear-gradient(180deg,rgba(1,205,254,.1),rgba(19,33,21,.6));
}
.rail-card h2{
  margin:0 0 6px;font-family:var(--fd);font-weight:700;
  font-size:17px;letter-spacing:.08em;color:var(--cy);
}
.rail-list{list-style:none;margin:0;padding:0;counter-reset:r}
.rail-list li{counter-increment:r}
.rail-list a{
  display:flex;align-items:center;gap:10px;min-height:44px;padding:6px 8px;
  color:var(--txt);text-decoration:none;font-size:16px;border-radius:4px;
  border-bottom:1px solid rgba(135,255,113,.1);
}
.rail-list li:last-child a{border-bottom:0}
.rail-list a::before{
  content:counter(r,decimal-leading-zero);
  font-family:var(--fd);font-size:13px;color:var(--ng);opacity:.85;
}
.rail-list a:hover{background:rgba(135,255,113,.14);color:var(--ng)}
.rail-top{margin:0}
.rail-top a{
  display:inline-flex;align-items:center;min-height:44px;padding:0 16px;
  color:var(--ng);text-decoration:none;font-size:16px;
  border:1px solid var(--line);border-radius:4px;
}
.rail-top a:hover{background:rgba(135,255,113,.13)}

/* 页脚 */
.foot{
  max-width:1120px;margin:0 auto;padding:38px 18px 34px;
  display:grid;grid-template-columns:1fr;gap:16px;
  border-top:2px solid var(--line);
}
.foot p{margin:0}
.foot-brand{
  font-family:var(--fd);font-weight:900;
  font-size:clamp(30px,9vw,60px);line-height:1;letter-spacing:-.02em;
  background:linear-gradient(100deg,var(--ng),var(--cy) 55%,var(--pink));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.foot-desc{font-size:15px;color:var(--dim);max-width:44ch}
.foot-links a{
  display:inline-flex;align-items:center;min-height:40px;margin-right:14px;
  color:var(--txt);text-decoration:none;font-size:16px;
  border-bottom:1px solid transparent;
}
.foot-links a:hover{color:var(--ng);border-bottom-color:var(--ng)}
.foot-contact{font-size:15px;color:var(--dim)}
.foot-contact b{color:var(--cy);font-weight:600}
.foot small{display:block;font-size:14px;color:var(--dim)}

/* 动效 */
.js .reveal{opacity:0;transform:translateY(18px);transition:opacity .5s ease,transform .5s ease}
.js .reveal.in{opacity:1;transform:none}
.menu-btn:hover{filter:hue-rotate(-18deg) brightness(1.06)}
.brand:hover{text-shadow:0 0 20px rgba(1,205,254,.9)}

@media (min-width:640px){
  .contact{display:block}
}
@media (min-width:900px){
  .bar{padding:11px 24px;gap:16px}
  .menu-btn{display:none}
  .nav{position:static;order:2}
  .nav p{
    display:flex;flex-direction:row;flex-wrap:wrap;gap:2px;
    padding:0;background:none;border:0;box-shadow:none;max-height:none;overflow:visible;
  }
  .nav p a{min-height:40px;padding:8px 10px;border-left:0;border-bottom:2px solid transparent;font-size:15px}
  .nav p a:hover,.nav p a:focus{border-left-color:transparent;border-bottom-color:var(--ng);background:none}
  .sep{width:1px;height:22px;margin:auto 8px;background:var(--line)}
  .bar-end{margin-left:0;order:3}
  .hero{grid-template-columns:1.1fr .9fr;gap:34px;padding:44px 24px 50px}
  .wrap{padding:0 24px 56px;gap:40px}
  .content section > div{padding:32px 26px}
  .foot{padding:48px 24px 40px}
}
@media (min-width:1024px){
  .wrap{grid-template-columns:minmax(0,1fr) 302px;align-items:start}
  .rail{position:sticky;top:20px}
  .foot{grid-template-columns:1.5fr 1.1fr .9fr}
  .foot-brand,.foot small{grid-column:1 / -1}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .reveal{opacity:1;transform:none;transition:none}
}

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