:root{
  --bg:#07080c; --bg2:#0d1017; --line:#1d2330;
  --txt:#e8ecf4; --dim:#8b95a8;
  --neon:#39ff88; --neon2:#22d3ee; --pink:#ff4d8d;
  --radius:16px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:
    radial-gradient(900px 500px at 15% -10%, rgba(57,255,136,.10), transparent 60%),
    radial-gradient(800px 500px at 90% 0%, rgba(34,211,238,.10), transparent 55%),
    var(--bg);
  color:var(--txt);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"PingFang SC","Noto Sans SC","Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
.wrap{width:min(1120px,92vw);margin:0 auto}
a{color:inherit;text-decoration:none}

/* nav */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);background:rgba(7,8,12,.72);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:.3px}
.dot{width:9px;height:9px;border-radius:50%;background:var(--neon);box-shadow:0 0 14px var(--neon)}
.links{display:flex;gap:8px;align-items:center;font-size:14px;color:var(--dim)}
.links a{padding:8px 12px;border-radius:10px;transition:.2s}
.links a:hover{color:var(--txt);background:#12151d}
.links .ghost{border:1px solid var(--line)}

/* hero */
.hero{padding:84px 0 40px;text-align:center}
.badge{display:inline-block;font-size:12.5px;color:var(--neon);border:1px solid rgba(57,255,136,.35);
  background:rgba(57,255,136,.07);padding:6px 14px;border-radius:999px;letter-spacing:.6px}
.hero h1{font-size:clamp(30px,6vw,58px);line-height:1.16;margin:22px 0 16px;font-weight:850;letter-spacing:-.5px}
.grad{background:linear-gradient(100deg,var(--neon),var(--neon2) 55%,var(--pink));-webkit-background-clip:text;background-clip:text;color:transparent}
.sub{color:var(--dim);max-width:620px;margin:0 auto;font-size:17px}
.cta{display:flex;gap:12px;justify-content:center;margin:32px 0 8px;flex-wrap:wrap}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:12px;border:1px solid var(--line);background:#101319;
  color:var(--txt);font-size:15px;font-weight:600;cursor:pointer;transition:.18s;font-family:inherit}
.btn:hover{transform:translateY(-1px);border-color:#2b3346;background:#151924}
.btn.primary{background:linear-gradient(100deg,var(--neon),#2ee6a0);color:#04120a;border:none;box-shadow:0 8px 26px rgba(57,255,136,.22)}
.btn.primary:hover{box-shadow:0 10px 32px rgba(57,255,136,.34)}
.btn.sm{padding:8px 14px;font-size:13.5px;border-radius:10px}
.btn.ghost{background:transparent;color:var(--dim)}

.stats{display:flex;justify-content:center;gap:44px;margin-top:46px;flex-wrap:wrap}
.stats div{display:flex;flex-direction:column;gap:2px}
.stats b{font-size:26px;letter-spacing:-.5px}
.stats span{font-size:12.5px;color:var(--dim);letter-spacing:.6px}

/* sections */
.sec-title{font-size:24px;margin:64px 0 22px;letter-spacing:-.3px}
.sec-title:before{content:"";display:inline-block;width:5px;height:20px;border-radius:3px;
  background:linear-gradient(var(--neon),var(--neon2));margin-right:12px;vertical-align:-3px}

/* cards */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(330px,1fr));gap:18px}
.card{background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.012));
  border:1px solid var(--line);border-radius:var(--radius);padding:20px;transition:.22s}
.card:hover{border-color:#2b3547;transform:translateY(-2px);box-shadow:0 18px 40px -20px rgba(0,0,0,.9)}
.card h3{margin:0 0 6px;font-size:17px;letter-spacing:.2px}
.hint{margin:0 0 12px;font-size:13px;color:var(--dim)}

textarea,input[type=text],input[type=number]{
  width:100%;background:#080a10;color:var(--txt);border:1px solid var(--line);border-radius:10px;
  padding:11px 13px;font:13.5px/1.6 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  resize:vertical;outline:none;transition:.18s}
textarea:focus,input:focus{border-color:rgba(57,255,136,.55);box-shadow:0 0 0 3px rgba(57,255,136,.10)}
textarea[readonly]{color:#9fe8c0;background:#070a0d}
.row{display:flex;gap:8px;margin:10px 0;flex-wrap:wrap;align-items:center}
.row input{flex:1;min-width:120px}
.out{background:#080a10;border:1px solid var(--line);border-radius:10px;padding:12px;
  font-size:13px;margin:8px 0 0;overflow:auto;white-space:pre-wrap;word-break:break-all;color:#9fe8c0;min-height:46px}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}

/* about */
.about-box{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:rgba(255,255,255,.02)}
.about-box p{margin:0 0 12px;color:#cfd6e4}
.about-box ul{margin:0;padding-left:20px;color:var(--dim)}
.about-box li{margin:6px 0}
.about-box b{color:var(--neon)}

/* footer */
.foot{border-top:1px solid var(--line);margin-top:72px;padding:26px 0;color:var(--dim);font-size:13px}
.foot .wrap{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}
.sep{opacity:.5}

/* toast */
.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);opacity:0;pointer-events:none;
  background:#0e1319;border:1px solid var(--line);color:var(--txt);padding:10px 18px;border-radius:12px;
  font-size:14px;transition:.25s;z-index:99;box-shadow:0 12px 30px rgba(0,0,0,.5)}
.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:600px){
  .hero{padding:56px 0 24px}
  .stats{gap:28px}
  .links a:not(.ghost){display:none}
}