:root{--color-page:#eef3f1;--color-surface:#fff;--color-text:#172026;--color-muted:#4d5a60;--color-border:#cdd8d1;--color-field-border:#aab7b1;--color-accent:#146c5f;--color-accent-hover:#0f554b;--color-brand:#a8462c;--color-code:#101719;--color-divider:#dce5df;--color-error-text:#8f1d1d;--color-error-bg:#ffe7e3;--focus-ring:#146c5f2e;--shadow-panel:0 18px 50px #1720261f;--radius-control:8px;--space-page:24px;--space-page-compact:16px;--panel-width:680px;--panel-padding:32px;--panel-padding-compact:24px;--control-height:48px;--min-viewport-width:320px;color:var(--color-text);background:var(--color-page);font-synthesis:none;text-rendering:optimizelegibility;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{min-width:var(--min-viewport-width);min-height:100vh;margin:0}button,input{font:inherit}.shell{min-height:100vh;padding:var(--space-page);place-items:center;display:grid}.panel{width:min(100%, var(--panel-width));gap:var(--space-page);padding:var(--panel-padding);border:1px solid var(--color-border);border-radius:var(--radius-control);background:var(--color-surface);box-shadow:var(--shadow-panel);display:grid}.brand{color:var(--color-brand);letter-spacing:0;text-transform:uppercase;margin:0;font-size:.78rem;font-weight:700}h1{letter-spacing:0;margin:-12px 0 0;font-size:clamp(2rem,5vw,3.35rem);line-height:1.02}.form{gap:10px;display:grid}label,.resultLabel{color:var(--color-muted);font-size:.92rem;font-weight:700}.inputRow{grid-template-columns:1fr auto;gap:10px;display:grid}input{border:1px solid var(--color-field-border);border-radius:var(--radius-control);width:100%;min-width:0;color:var(--color-text);background:var(--color-surface);padding:14px 16px}input:focus{border-color:var(--color-accent);outline:3px solid var(--focus-ring)}button{min-height:var(--control-height);border-radius:var(--radius-control);color:var(--color-surface);background:var(--color-accent);cursor:pointer;border:0;padding:0 18px;font-weight:800}button:hover:not(:disabled){background:var(--color-accent-hover)}button:disabled{cursor:not-allowed;opacity:.5}.message{border-radius:var(--radius-control);margin:0;padding:12px 14px}.error{color:var(--color-error-text);background:var(--color-error-bg)}.result{border-top:1px solid var(--color-divider);grid-template-columns:1fr auto;align-items:end;gap:8px 16px;padding-top:8px;display:grid}.resultLabel{grid-column:1/-1}.result strong{color:var(--color-code);letter-spacing:0;font-family:SFMono-Regular,Consolas,Liberation Mono,monospace;font-size:clamp(1.6rem,8vw,2.8rem);line-height:.92}@media (width<=620px){.shell{padding:var(--space-page-compact);align-items:start}.panel{padding:var(--panel-padding-compact)}.inputRow,.result{grid-template-columns:1fr}button{width:100%}}