:root{
  color-scheme: dark;
  --bg:#0b0e12; --card:#12161c; --text:#e7edf2; --muted:#9ba7b4; --accent:#4aa3ff;
  --radius:16px; --s1:6px; --s2:10px; --s3:14px; --s4:18px; --s5:24px; --shadow:0 10px 30px rgba(0,0,0,.25);
}
*{box-sizing:border-box;}
html,body{height:100%;}
body{margin:0;background:#0b0e12;color:var(--text);font:15px/1.6 system-ui,Segoe UI,Roboto,Arial,sans-serif;display:grid;place-items:center;min-height:100vh;}
h1{font-size:22px;}
.header{position:absolute;top:0;left:0;right:0;padding:var(--s4) var(--s5);}
.title{margin:0;font-weight:700;letter-spacing:.2px;}
.wrapper{width:100%; padding:calc(var(--s6,32px) + 20px) var(--s5) var(--s5);}
.card{width:100%;max-width:420px;margin:40px auto 0;background:linear-gradient(180deg,rgba(29,36,50,.4),rgba(15,20,31,.7));border:1px solid rgba(255,255,255,.08);border-radius:var(--radius);padding:var(--s5);box-shadow:var(--shadow);}
.heading{font-size:20px;margin:0 0 var(--s3);}
.field{margin:var(--s3) 0;}
.field label{display:block;font-size:12px;color:var(--muted);margin-bottom:6px;}
.field input{width:100%;padding:10px 12px;border-radius:12px;border:1px solid rgba(255,255,255,.15);background:#0f1520;color:var(--text);}
.field input:focus{outline:2px solid var(--accent);outline-offset:2px;}
.btn{width:100%;color:#00cfff;margin:var(--s4) 0 var(--s2);padding:10px 12px;border-radius:12px;border:1px solid rgba(255,255,255,.15);background:#141a25;color:var(--text);cursor:pointer;transition:transform .12s ease, opacity .12s ease;}
.btn:hover{opacity:1; transform:translateY(-1px);}
.btn:focus-visible{outline:2px solid var(--accent); outline-offset:2px;}
.err{color:#ff8a8a;margin-top:20px;display:none;}
.ok {color:#86f2d1;margin-top:20px;display:none;}
.okerr{height:40px;display:flex;flex-direction:column;align-items:center;justify-content:center;}
#loginBtn,#regRedirBtn{color:#00cfff;}
footer{position:fixed;bottom:20px;display:flex;flex-direction:row;width:100%;padding:0 20px;justify-content:space-between;margin:5px auto;text-align:center;color:var(--muted);}
#tOP{margin-top:10px}
#background-imgs{z-index:1;margin:auto;height:245px;background:#0b0e12;color:#6bc4c4;position:absolute;left:43%;top:0%;display:flex;flex-direction:column;}
#svg-wrapper{z-index:0;opacity:0.25;margin:auto;width:212px;height:260px;color:#0b0e12;background:#6bc4c4;position:absolute;left:4%;top:35%;}  
#svg-wrapper svg{width:100%;height:100%;display:block;}
.card{z-index:10;position:relative;}
.tab{appearance:none;border:1px solid rgba(255,255,255,.15);background:#141a25;color:var(--text);padding:8px 12px;border-radius:12px;cursor:pointer;opacity:.9;transition:transform .12s ease, box-shadow .12s ease, opacity .12s ease;}
.tab:hover{opacity:1;transform:translateY(-1px);}
.legal{font-size:11px;margin:0 var(--space-5);}
@media (max-width:480px){
  .card{padding:var(--s4); margin-top:var(--s5);}
  #background-imgs{position:absolute;inset:0;display:flex;align-items:flex-start;justify-content:center;padding-top:12vh;background:transparent;z-index:1;height:auto;}
  #svg-wrapper{position:relative;left:auto;top:auto;width:clamp(160px,60vw,260px);height:260px;opacity:.25;color:#0b0e16;background:#6bc4c4;}
  #svg-wrapper svg{display:block;width:100%;height:auto;}
  footer{text-align:center;position:relative;}
  #tOP{position:static;display:inline-block;margin-top:12px;}
}