:root{--bg:#03091d;--panel:#081735;--panel2:#0b2045;--text:#edf6ff;--muted:#94a5bd;--cyan:#16d0ff;--line:rgba(55,190,255,.18);--danger:#ff5c7a}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-width:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;overflow-x:hidden}
body:before{content:"";position:fixed;inset:0;z-index:-3;background:radial-gradient(circle at 15% 10%,rgba(0,122,255,.22),transparent 34%),radial-gradient(circle at 85% 40%,rgba(20,65,255,.16),transparent 42%),linear-gradient(180deg,#061332 0%,#03091d 72%)}
#particles-js{position:fixed;inset:0;z-index:-2;pointer-events:none;opacity:.42}
a{color:inherit}
.navbar{height:72px;border-bottom:1px solid rgba(55,190,255,.14);background:rgba(3,8,25,.88);backdrop-filter:blur(14px);position:sticky;top:0;z-index:5000}
.nav-container{height:100%;width:min(1180px,calc(100% - 32px));margin:auto;display:flex;align-items:center;justify-content:space-between;position:relative}
.nav-brand a{display:inline-flex;align-items:center;gap:9px;text-decoration:none}
.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border:1px solid rgba(24,215,232,.38);border-radius:9px;background:linear-gradient(135deg,rgba(24,215,232,.14),rgba(22,89,255,.10));box-shadow:0 0 18px rgba(24,215,232,.10);font-family:ui-monospace,monospace;font-size:11px;font-weight:800;color:#18d7e8}
.brand-name{font-size:23px;font-weight:800;letter-spacing:-1px;color:#f4f8ff}
.brand-name span{color:#18d7e8}
.brand-name b{color:#18d7e8}
.nav-links{display:flex;align-items:center;gap:24px}
.nav-links a{font-size:13px;color:#b8c8df;text-decoration:none}
.nav-links a:hover{color:#18d7e8}
.hamburger{display:none;width:38px;height:38px;position:relative;align-items:center;justify-content:center;cursor:pointer}
.hamburger span{position:absolute;width:27px;height:3px;background:#fff;border-radius:99px;transition:.25s}
.hamburger span:nth-child(1){top:9px}.hamburger span:nth-child(2){top:17px}.hamburger span:nth-child(3){top:25px}
.hamburger.active span:nth-child(1){top:17px;transform:rotate(45deg)}.hamburger.active span:nth-child(2){opacity:0}.hamburger.active span:nth-child(3){top:17px;transform:rotate(-45deg)}
.container,.content{width:min(980px,calc(100% - 28px));margin:auto}
.hero{text-align:center;padding:68px 10px 38px}
.hero h1{margin:0;font-size:clamp(34px,7vw,58px);line-height:1.05;letter-spacing:-1.8px}
.hero p{margin:13px auto 0;color:var(--muted);font-size:15px;line-height:1.6}
.checker-box{width:min(760px,100%);margin:0 auto;padding:26px;border:1px solid var(--line);border-radius:22px;background:linear-gradient(145deg,rgba(13,39,79,.82),rgba(6,18,43,.9));box-shadow:0 20px 60px rgba(0,30,90,.18)}
input,textarea,select{width:100%;border:1px solid rgba(55,190,255,.2);border-radius:12px;background:#06142f;color:#edf6ff;padding:13px 14px;font:inherit;outline:none}
input:focus,textarea:focus,select:focus{border-color:rgba(22,208,255,.65);box-shadow:0 0 0 3px rgba(22,208,255,.08)}
textarea{min-height:145px;resize:vertical;line-height:1.55}
button,.btn{font:inherit}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 18px;border:1px solid rgba(22,208,255,.28);border-radius:12px;background:var(--cyan);color:#02101c;text-decoration:none;font-size:13px;font-weight:850;cursor:pointer;box-shadow:0 10px 28px rgba(0,208,255,.12)}
.btn:hover{filter:brightness(1.06);transform:translateY(-1px)}
.controls{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.controls .btn{flex:1;min-width:110px}
.back-wrap{text-align:center;margin:30px 0 0}
footer{text-align:center;padding:55px 20px 38px;font-size:12px;color:#71839e}
.status{margin:15px 0;padding:13px 14px;border-radius:12px;background:rgba(4,16,39,.7);border:1px solid var(--line);color:#9eb1ca;font-size:13px}
@media(max-width:768px){
 .navbar{height:64px}.nav-container{width:calc(100% - 22px)}
 .hamburger{display:flex}
 .nav-links{display:none;position:absolute;top:70px;left:0;right:0;padding:10px;background:rgba(3,10,29,.98);border:1px solid rgba(22,208,255,.24);border-radius:16px;box-shadow:0 18px 50px rgba(0,0,0,.45);flex-direction:column;align-items:stretch;gap:0}
 .nav-links.active{display:flex}.nav-links a{padding:14px;border-bottom:1px solid rgba(55,190,255,.08)}.nav-links a:last-child{border:0}
 .brand-name{font-size:21px}.brand-mark{width:28px;height:28px}
 .content,.container{width:calc(100% - 20px)}
 .hero{padding:48px 4px 30px}.hero h1{font-size:clamp(31px,9.5vw,46px);letter-spacing:-1px}.hero p{font-size:14px}
 .checker-box{padding:18px;border-radius:18px}
 .btn{width:100%}.controls .btn{width:auto}
}