:root{
  --svt-primary:#635BFF;
  --svt-primary-dark:#4F46E5;
  --svt-surface:#fff;
  --svt-soft:#F7F7FC;
  --svt-success:#16845B;
  --svt-warning:#B7791F;
  --svt-text:#182230;
  --svt-muted:#667085;
  --svt-border:#E4E7EC;
  --svt-shadow:0 14px 38px rgba(16,24,40,.08);
  --svt-radius:20px;
}
.svt-app{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--svt-text);line-height:1.55}
.svt-app *{box-sizing:border-box}
.svt-shell{max-width:1050px;margin:0 auto;padding:24px}
.svt-header{text-align:center;max-width:760px;margin:0 auto 28px}
.svt-kicker{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--svt-primary);margin-bottom:8px}
.svt-header h2{font-size:clamp(30px,5vw,44px);line-height:1.15;margin:0 0 12px}
.svt-header p{font-size:17px;color:var(--svt-muted);margin:0}
.svt-tabs{display:flex;background:var(--svt-soft);padding:5px;border-radius:14px;max-width:420px;margin:0 auto 22px;border:1px solid var(--svt-border)}
.svt-tab{flex:1;min-height:48px;border:0;border-radius:10px;background:transparent;color:var(--svt-muted);font-size:16px;font-weight:700;cursor:pointer}
.svt-tab.is-active{background:#fff;color:var(--svt-primary);box-shadow:0 3px 12px rgba(16,24,40,.08)}
.svt-panel{margin-bottom:20px}
.svt-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:18px}
.svt-card,.svt-results{background:var(--svt-surface);border:1px solid var(--svt-border);border-radius:var(--svt-radius);box-shadow:var(--svt-shadow);padding:24px}
.svt-card h3{font-size:20px;margin:0 0 10px}
.svt-helper{color:var(--svt-muted);margin:0 0 20px}
.svt-step-row{display:flex;gap:8px;margin-bottom:18px}
.svt-step{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:#EEF0F4;color:var(--svt-muted);font-weight:800}
.svt-step.is-active{background:var(--svt-primary);color:white}
.svt-step.is-done{background:#DFF5EB;color:var(--svt-success)}
.svt-live{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:18px 0}
.svt-live>div,.svt-range-pair>div,.svt-metric{background:var(--svt-soft);border:1px solid var(--svt-border);border-radius:14px;padding:15px}
.svt-live-label,.svt-range-pair span,.svt-metric span{display:block;color:var(--svt-muted);font-size:13px;margin-bottom:4px}
.svt-live strong{font-size:22px}
.svt-stability{margin:18px 0}
.svt-stability-head{display:flex;justify-content:space-between;font-size:14px;color:var(--svt-muted);margin-bottom:8px}
.svt-progress{height:10px;background:#EEF0F4;border-radius:999px;overflow:hidden}
.svt-progress span{display:block;width:0;height:100%;background:var(--svt-primary);transition:width .12s ease}
.svt-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.svt-btn{min-height:48px;border-radius:12px;padding:0 18px;font-size:16px;font-weight:800;cursor:pointer;border:1px solid transparent}
.svt-btn-primary{background:var(--svt-primary);color:#fff}
.svt-btn-primary:hover{background:var(--svt-primary-dark)}
.svt-btn-secondary{background:#fff;color:var(--svt-text);border-color:var(--svt-border)}
.svt-btn:disabled{opacity:.55;cursor:not-allowed}
.svt-btn:focus-visible,.svt-tab:focus-visible,.svt-text-btn:focus-visible,select:focus-visible{outline:3px solid rgba(99,91,255,.3);outline-offset:2px}
.svt-privacy{font-size:13px;color:var(--svt-muted);margin:14px 0 0}
.svt-range-pair{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0}
.svt-range-pair strong{font-size:26px}
.svt-form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.svt-form-grid label span{display:block;font-weight:700;margin-bottom:7px}
.svt-form-grid select{width:100%;min-height:48px;border:1px solid var(--svt-border);border-radius:12px;background:#fff;padding:0 14px;font-size:16px;color:var(--svt-text)}
.svt-error{color:#B42318;font-size:14px;margin:10px 0 0}
.svt-results{margin:20px 0}
.svt-result-hero{text-align:center;padding:12px 10px 24px}
.svt-result-label{display:block;font-size:14px;color:var(--svt-muted);font-weight:700;margin-bottom:5px}
.svt-result-hero strong{display:block;font-size:clamp(34px,5vw,52px);color:var(--svt-primary);line-height:1.1}
.svt-result-hero p{max-width:760px;margin:12px auto 0;color:var(--svt-muted)}
.svt-metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:0 0 20px}
.svt-metric strong{font-size:18px}
.svt-keyboard-wrap{border:1px solid var(--svt-border);border-radius:16px;padding:16px;margin:20px 0;background:var(--svt-soft)}
.svt-keyboard-labels{display:flex;justify-content:space-between;color:var(--svt-muted);font-size:13px;margin-bottom:12px}
.svt-keyboard{display:flex;height:88px;overflow:hidden;border-radius:10px;background:#fff;border:1px solid var(--svt-border)}
.svt-key{flex:1;border-right:1px solid #D0D5DD;position:relative;background:#fff}
.svt-key:last-child{border-right:0}
.svt-key.is-in-range{background:#E9E8FF}
.svt-key.is-edge{background:var(--svt-primary)}
.svt-result-note{border-left:4px solid var(--svt-primary);background:#F7F7FF;padding:14px 16px;border-radius:10px}
.svt-result-note p{margin:5px 0 0;color:var(--svt-muted)}
.svt-history-card{margin-top:20px;box-shadow:none}
.svt-history-head{display:flex;align-items:center;justify-content:space-between;gap:15px}
.svt-text-btn{border:0;background:transparent;color:var(--svt-primary);font-weight:700;cursor:pointer;padding:8px}
.svt-history-list{display:grid;gap:8px}
.svt-history-item{display:flex;justify-content:space-between;gap:12px;padding:10px 0;border-top:1px solid var(--svt-border);font-size:14px}
.svt-history-item span{color:var(--svt-muted)}
.svt-troubleshooting{margin:18px 0 0;padding:16px 18px;background:#FFF8E8;border:1px solid #F5D998;border-radius:14px}
.svt-troubleshooting p{margin:5px 0 0;color:#72530D}
.svt-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}
[hidden]{display:none!important}
@media(max-width:800px){
  .svt-shell{padding:16px}
  .svt-grid,.svt-metrics{grid-template-columns:1fr 1fr}
  .svt-input-card{grid-column:1/-1}
}
@media(max-width:560px){
  .svt-grid,.svt-live,.svt-form-grid,.svt-metrics{grid-template-columns:1fr}
  .svt-card,.svt-results{padding:18px}
  .svt-actions{flex-direction:column}
  .svt-btn{width:100%}
  .svt-keyboard{height:72px}
}