:root{
  --bg:#090b12;
  --panel:#111522;
  --panel2:#151a2a;
  --line:#252d42;
  --text:#f4f6fb;
  --muted:#9ba5ba;
  --accent:#7c5cff;
  --accent2:#4f8cff;
  --good:#39d98a;
  --bad:#ff657a;
  --shadow:0 18px 50px rgba(0,0,0,.28);
  --radius:18px;
}
*{box-sizing:border-box}
html{background:var(--bg)}
body{
  margin:0;
  color:var(--text);
  background:
    radial-gradient(900px 500px at 85% -10%,rgba(124,92,255,.16),transparent 60%),
    radial-gradient(700px 500px at -10% 20%,rgba(79,140,255,.10),transparent 60%),
    var(--bg);
  font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  line-height:1.45;
}
a{color:inherit}
button,input,select{font:inherit}
.container,.wrap,.page{max-width:1180px;margin:0 auto;padding:24px}
header,.header,.topbar{
  position:sticky;top:0;z-index:20;
  backdrop-filter:blur(16px);
  background:rgba(9,11,18,.78);
  border-bottom:1px solid rgba(255,255,255,.06);
}
.card,.panel,.box,form{
  background:linear-gradient(180deg,rgba(21,26,42,.96),rgba(15,19,31,.96));
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
h1,h2,h3{letter-spacing:-.025em}
h1{font-size:clamp(28px,4vw,42px)}
h2{font-size:24px}
label{display:block;color:var(--muted);font-size:14px;margin:0 0 7px}
input,select,textarea{
  width:100%;min-height:46px;
  color:var(--text);
  background:#0c101b;
  border:1px solid #2b344b;
  border-radius:12px;
  padding:10px 13px;
  outline:none;
  transition:.18s border,.18s box-shadow;
}
input:focus,select:focus,textarea:focus{
  border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(124,92,255,.14);
}
button,.btn{
  border:0;border-radius:12px;
  padding:11px 16px;
  cursor:pointer;
  color:#fff;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  box-shadow:0 8px 22px rgba(92,91,220,.22);
  font-weight:700;
  transition:transform .15s,filter .15s;
}
button:hover,.btn:hover{transform:translateY(-1px);filter:brightness(1.06)}
button.secondary,.btn.secondary{
  background:#1b2233;border:1px solid #303a52;box-shadow:none;color:#dfe4ef
}
.grid{gap:18px}
.calculator-grid,.main-grid,.content-grid{
  display:grid;grid-template-columns:minmax(0,1.55fr) minmax(300px,.85fr);gap:20px;
}
.result,.results,.summary{
  position:sticky;top:92px;
  align-self:start;
}
.stat,.metric,.result-card{
  background:#0d1220;border:1px solid #29334a;border-radius:14px;padding:16px;
}
.big-number,.price,.total{
  font-size:clamp(30px,4vw,48px);font-weight:850;letter-spacing:-.04em;
}
.good,.success{color:var(--good)}
.bad,.danger{color:var(--bad)}
.muted{color:var(--muted)}
nav a,.tabs a{
  text-decoration:none;color:var(--muted);padding:9px 11px;border-radius:10px
}
nav a:hover,.tabs a:hover{background:#171d2d;color:#fff}
table{width:100%;border-collapse:collapse}
th,td{padding:12px 10px;border-bottom:1px solid var(--line);text-align:left}
th{color:var(--muted);font-weight:600;font-size:13px}
.alert{border-radius:12px;padding:12px 14px;background:#171d2c;border:1px solid var(--line)}
.modal,.overlay{backdrop-filter:blur(10px)}
footer{color:#6f7890;padding:30px 0}
@media(max-width:800px){
  .container,.wrap,.page{padding:14px}
  .calculator-grid,.main-grid,.content-grid{grid-template-columns:1fr}
  .result,.results,.summary{position:static}
  .card,.panel,form{border-radius:15px}
  h1{font-size:30px}
}
@media(max-width:520px){
  .container,.wrap,.page{padding:10px}
  input,select{min-height:44px}
  button,.btn{width:100%}
}