:root{
    --bg1:#0f172a; /* slate-900 */
    --bg2:#1e293b; /* slate-800 */
    --card:#0b1220cc;
    --stroke:#243041;
    --text:#e5e7eb;
    --muted:#94a3b8;
    --accent:#22d3ee;
    --accent2:#a78bfa;
    --danger:#ff3b3b;
    --shadow: 0 10px 30px rgba(0,0,0,.35), inset 0 1px 0 rgba(255,255,255,.03);
  }
  
  *{box-sizing:border-box}
  html,body{height:100%}
  body{
    margin:0;
    color:var(--text);
    font:16px/1.45 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,"Helvetica Neue","Noto Sans",sans-serif;
    background: radial-gradient(1200px 600px at 10% 10%, #0ea5e930 0%, transparent 50%),
                radial-gradient(1200px 600px at 90% 90%, #8b5cf630 0%, transparent 55%),
                linear-gradient(135deg, var(--bg1), var(--bg2));
    overflow-x:hidden;
  }
  
  .bg-gradient{
    position:fixed; inset:-20% -20%;
    filter: blur(60px) saturate(120%);
    pointer-events:none;
  }
  
  .container{
    max-width: 920px;
    margin: clamp(16px, 4vh, 32px) auto;
    padding: 16px;
  }
  
  .header{
    text-align:center;
    margin-bottom: 16px;
  }
  .header h1{
    margin:0 0 6px 0;
    font-size: clamp(1.4rem, 2.4vw + 0.8rem, 2.4rem);
    letter-spacing: .2px;
  }
  .subtitle{
    margin:0;
    color:var(--muted);
  }
  
  .card{
    margin-top: 18px;
    background: linear-gradient(180deg, rgba(17,25,40,.65), rgba(8,13,23,.65));
    backdrop-filter: blur(10px);
    border: 1px solid var(--stroke);
    border-radius: 18px;
    box-shadow: var(--shadow);
    padding: clamp(16px, 2.4vw, 28px);
  }
  
  .grid{
    display:grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(12px, 2vw, 20px);
  }
  @media (max-width: 820px){
    .grid{ grid-template-columns: 1fr; }
  }
  
  .field{
    display:flex; flex-direction:column; gap:8px;
  }
  .field span{
    color:var(--muted);
    font-size:.95rem;
  }
  .field input{
    width:100%;
    padding: 12px 14px;
    border-radius: 12px;
    background: #0b1220;
    color: var(--text);
    border: 1px solid #1f2a3a;
    outline:none;
    transition: border-color .2s, box-shadow .2s;
  }
  .field input:focus{
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(34,211,238,.15);
  }
  
  .results{
    display:grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(12px, 2vw, 20px);
    margin-top: 18px;
  }
  @media (max-width: 820px){
    .results{ grid-template-columns: 1fr; }
  }
  .result{
    padding: 14px;
    border:1px solid var(--stroke);
    border-radius: 14px;
    background: linear-gradient(180deg, rgba(10,16,28,.8), rgba(8,13,23,.8));
  }
  .label{
    color:var(--muted);
    font-size:.9rem;
    margin-bottom: 6px;
  }
  .value{
    font-variant-numeric: tabular-nums;
    font-size: clamp(1.2rem, 2vw + .6rem, 2rem);
  }
  
  .footer{
    display:flex; align-items:center; justify-content:space-between;
    gap:12px; margin-top:16px;
  }
  .btn{
    appearance:none; border:0; cursor:pointer;
    padding:10px 14px;
    border-radius:12px;
    color:#0b1220; background: linear-gradient(90deg, var(--accent), var(--accent2));
    font-weight:600;
    box-shadow: var(--shadow);
    transition: transform .06s ease-in-out, filter .2s;
  }
  .btn:active{ transform: translateY(1px) }
  .hint{ color:var(--muted) }
  
  .shock{
    display:none;
    margin-top:14px;
    border:1px solid color-mix(in oklab, var(--danger) 70%, white 0%);
    background: linear-gradient(180deg, color-mix(in oklab, var(--danger) 18%, transparent), rgba(255,0,0,.06));
    color:#ffe9e9;
    padding:12px 14px;
    border-radius:12px;
    font-weight:700;
    letter-spacing:.2px;
    animation: pop .35s ease-out both;
  }
  .shock.show{ display:block; }
  @keyframes pop{
    0%{ transform: scale(.98); filter: saturate(80%); opacity:0 }
    60%{ transform: scale(1.02); filter: saturate(140%); opacity:1 }
    100%{ transform: scale(1) }
  }