:root{
  --ntfc-primary:#635BFF;
  --ntfc-primary-dark:#4F46E5;
  --ntfc-success:#16845B;
  --ntfc-surface:#FFFFFF;
  --ntfc-soft:#F7F7FC;
  --ntfc-text:#182230;
  --ntfc-muted:#667085;
  --ntfc-border:#E4E7EC;
  --ntfc-shadow:0 14px 40px rgba(16,24,40,.08);
  --ntfc-radius:20px;
}
.ntfc-app{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ntfc-text);line-height:1.55}
.ntfc-app *{box-sizing:border-box}
.ntfc-shell{max-width:1050px;margin:0 auto;padding:24px}
.ntfc-header{text-align:center;max-width:760px;margin:0 auto 28px}
.ntfc-kicker{display:inline-block;font-size:13px;font-weight:800;text-transform:uppercase;letter-spacing:.04em;color:var(--ntfc-primary);margin-bottom:8px}
.ntfc-header h2{font-size:clamp(30px,5vw,44px);line-height:1.15;margin:0 0 12px}
.ntfc-header p{font-size:17px;color:var(--ntfc-muted);margin:0}
.ntfc-layout{display:grid;grid-template-columns:.9fr 1.1fr;gap:18px}
.ntfc-card,.ntfc-result-card{background:var(--ntfc-surface);border:1px solid var(--ntfc-border);border-radius:var(--ntfc-radius);box-shadow:var(--ntfc-shadow);padding:24px}
.ntfc-card h3{font-size:20px;margin:0 0 18px}
.ntfc-form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.ntfc-field{display:block}
.ntfc-field>span{display:block;font-weight:700;margin-bottom:7px}
.ntfc-field select,.ntfc-field input{width:100%;min-height:48px;border:1px solid var(--ntfc-border);border-radius:12px;background:#fff;color:var(--ntfc-text);font-size:16px;padding:0 14px}
.ntfc-input-suffix{display:flex;align-items:center;border:1px solid var(--ntfc-border);border-radius:12px;overflow:hidden;background:#fff}
.ntfc-input-suffix input{border:0;border-radius:0}
.ntfc-input-suffix span{padding:0 14px;color:var(--ntfc-muted);font-weight:700}
.ntfc-presets{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.ntfc-presets button{min-height:40px;padding:0 12px;border-radius:10px;border:1px solid var(--ntfc-border);background:#fff;color:var(--ntfc-text);font-size:14px;font-weight:700;cursor:pointer}
.ntfc-presets button.is-active{background:#ECEBFF;color:var(--ntfc-primary);border-color:#C8C5FF}
.ntfc-error{min-height:21px;color:#B42318;font-size:14px;margin:10px 0 0}
.ntfc-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.ntfc-btn{min-height:48px;border-radius:12px;padding:0 18px;font-size:16px;font-weight:800;cursor:pointer;border:1px solid transparent}
.ntfc-btn-primary{background:var(--ntfc-primary);color:#fff}
.ntfc-btn-primary:hover{background:var(--ntfc-primary-dark)}
.ntfc-btn-secondary{background:#fff;color:var(--ntfc-text);border-color:var(--ntfc-border)}
.ntfc-btn:focus-visible,.ntfc-text-btn:focus-visible,.ntfc-presets button:focus-visible,.ntfc-field select:focus-visible,.ntfc-field input:focus-visible{outline:3px solid rgba(99,91,255,.28);outline-offset:2px}
.ntfc-result-card{text-align:center;background:linear-gradient(180deg,#fff 0%,#FAFAFF 100%)}
.ntfc-result-label{display:block;font-size:13px;font-weight:800;text-transform:uppercase;letter-spacing:.04em;color:var(--ntfc-muted)}
.ntfc-frequency{display:block;font-size:clamp(42px,7vw,68px);line-height:1.05;color:var(--ntfc-primary);margin:8px 0}
.ntfc-note-pill{display:inline-block;padding:6px 12px;border-radius:999px;background:#ECEBFF;color:var(--ntfc-primary);font-weight:800;margin-bottom:22px}
.ntfc-metrics{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;text-align:left}
.ntfc-metrics>div,.ntfc-octaves>div{background:var(--ntfc-soft);border:1px solid var(--ntfc-border);border-radius:14px;padding:14px}
.ntfc-metrics span,.ntfc-octaves span{display:block;color:var(--ntfc-muted);font-size:12px;margin-bottom:4px}
.ntfc-metrics strong,.ntfc-octaves strong{font-size:17px}
.ntfc-octaves{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:10px;text-align:left}
.ntfc-formula-note{text-align:left;border-left:4px solid var(--ntfc-primary);background:#F7F7FF;padding:14px 16px;border-radius:10px;margin-top:16px}
.ntfc-formula-note p{margin:5px 0 0;color:var(--ntfc-muted);font-size:14px}
.ntfc-history-card{margin-top:18px;box-shadow:none}
.ntfc-history-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}
.ntfc-history-head h3{margin-bottom:2px}
.ntfc-history-head p{margin:0;color:var(--ntfc-muted);font-size:13px}
.ntfc-text-btn{border:0;background:transparent;color:var(--ntfc-primary);font-weight:800;cursor:pointer;padding:8px}
.ntfc-history-list{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:14px}
.ntfc-history-item{border:1px solid var(--ntfc-border);background:var(--ntfc-soft);border-radius:12px;padding:11px}
.ntfc-history-item strong{display:block;font-size:16px}
.ntfc-history-item span{display:block;color:var(--ntfc-muted);font-size:12px;margin-top:2px}
.ntfc-note-card{margin-top:18px;background:#FFF8E8;border:1px solid #F5D998;border-radius:14px;padding:16px 18px}
.ntfc-note-card p{margin:5px 0 0;color:#72530D}
.ntfc-sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:800px){
  .ntfc-shell{padding:16px}
  .ntfc-layout{grid-template-columns:1fr}
}
@media(max-width:560px){
  .ntfc-card,.ntfc-result-card{padding:18px}
  .ntfc-form-grid,.ntfc-metrics,.ntfc-octaves,.ntfc-history-list{grid-template-columns:1fr}
  .ntfc-actions{flex-direction:column}
  .ntfc-btn{width:100%}
  .ntfc-history-head{flex-direction:column}
}