:root{
  --bg:#0b1220; --card:#0f172a; --text:#e5e7eb; --muted:#94a3b8; --border:#1e293b;
  --primary:#0ea5e9; --primary-600:#0284c7;
}
:root.light{
  --bg:#f7fafc; --card:#ffffff; --text:#0f172a; --muted:#475569; --border:#e2e8f0;
  --primary:#0ea5e9; --primary-600:#0284c7;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,Inter,Arial,sans-serif;}
.container{max-width:960px;margin:0 auto;padding:16px;}
.site-header{position:sticky;top:0;z-index:10;border-bottom:1px solid var(--border);
  background:linear-gradient(180deg, rgba(14,165,233,.08), rgba(14,165,233,0));backdrop-filter:blur(6px) saturate(120%);}
.header-inner{display:flex;align-items:center;justify-content:space-between;}
h1{font-size:clamp(22px,2.8vw,32px);margin:8px 0;}
h2{font-size:clamp(18px,2.2vw,24px);margin:0 0 10px 0;}

.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:16px;margin:16px 0;box-shadow:0 6px 20px rgba(0,0,0,.08);}
.muted{color:var(--muted);} .small{font-size:12px;} .hidden{display:none !important;}
.mt8{margin-top:8px;}

.grid.two{display:grid;grid-template-columns:1fr 1fr;gap:12px;}
.grid.three{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px;}
@media (max-width:900px){.grid.three{grid-template-columns:1fr 1fr}}
@media (max-width:640px){.grid.two,.grid.three{grid-template-columns:1fr}}

.form-group{margin:10px 0;}
label{display:block;font-weight:600;margin-bottom:6px;}
input,select,textarea,button{font:inherit}
input[type="number"], input[type="text"], input[type="url"], select, textarea{
  width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:10px;background:var(--card);color:var(--text);
}
input:focus,select:focus,textarea:focus{outline:3px solid rgba(14,165,233,.35);outline-offset:2px;}

.hstack{display:flex;gap:10px;align-items:center;}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px;}
button{cursor:pointer;border-radius:10px;border:1px solid var(--border);padding:10px 14px;background:var(--card);color:var(--text);min-height:44px;}
button.primary{background:linear-gradient(90deg,var(--primary),var(--primary-600));color:#fff;border:none;}
button.secondary{background:#132033;border-color:#243b61;color:#fff;}
button.ghost{background:transparent;border-color:var(--border);}
button:disabled{opacity:.55;cursor:not-allowed;}

.header-actions .ghost{width:40px;height:40px;display:grid;place-items:center;border:1px solid var(--border);}

/* Result box */
.result-box{border:1px dashed var(--border);border-radius:12px;background:rgba(2,6,23,.25);padding:16px;font-size:18px;min-height:48px}
.result-box .big{font-size:22px;font-weight:700}

.table-wrap{overflow:auto;border:1px solid var(--border);border-radius:12px;background:rgba(2,6,23,.15);padding:8px}
table{width:100%;border-collapse:collapse}
th,td{padding:8px 10px;border-bottom:1px solid var(--border);text-align:left}
tbody tr:hover{background:rgba(14,165,233,.06)}

select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);
  background-position:calc(100% - 18px) calc(1em + 2px), calc(100% - 13px) calc(1em + 2px);
  background-size:5px 5px, 5px 5px;background-repeat:no-repeat;padding-right:36px}