:root{
  --ink:#1f2933;
  --muted:#5d6872;
  --line:#d9dee3;
  --soft:#f5f7f8;
  --accent:#315f72;
  --accent-soft:#eaf1f4;
  --focus:#111827;
}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:#fff;line-height:1.55}
.wrap{max-width:980px;margin:0 auto;padding:24px}
.hero{border-top:8px solid var(--accent);background:#f7f8f9;padding:24px 26px;margin-bottom:20px}
.eyebrow{margin:0 0 6px;text-transform:uppercase;font-size:.8rem;letter-spacing:.08em;color:var(--muted);font-weight:700}
h1,h2{color:#111827}
h1{margin:0;font-size:2rem}
h2{margin:0 0 10px;font-size:1.25rem}
.panel{display:grid;grid-template-columns:44px 1fr;gap:16px;border:1px solid var(--line);padding:20px;margin:16px 0;border-radius:8px}
.step{width:36px;height:36px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:700}
.scenario-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
button,.scenario{font:inherit}
.scenario{padding:12px;border:2px solid var(--line);background:#fff;border-radius:6px;text-align:left;cursor:pointer}
.scenario.active{border-color:var(--accent);background:var(--accent-soft)}
.scenario:focus-visible,input:focus-visible{outline:3px solid var(--focus);outline-offset:3px}
.prediction-row{display:flex;flex-wrap:wrap;gap:12px}
.prediction-row label{border:1px solid var(--line);padding:10px 12px;border-radius:6px}
.controls{display:grid;gap:18px}
.controls label{display:grid;grid-template-columns:minmax(180px,1fr) 2fr 80px;gap:12px;align-items:center}
input[type=range]{width:100%}
output{font-weight:700;text-align:right}
.result-panel{background:var(--soft)}
.results{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.metric{border:1px solid var(--line);background:#fff;padding:14px;border-radius:6px}
.metric span{display:block;color:var(--muted);font-size:.9rem}
.metric strong{display:block;font-size:1.55rem;margin-top:4px}
.metric.emphasized{border:2px solid var(--accent)}
.explain{margin:16px 0 0;padding:14px;background:#fff;border-left:5px solid var(--accent)}
.privacy{font-size:.9rem;color:var(--muted);text-align:center;margin:28px 0}
@media (max-width:700px){
  .panel{grid-template-columns:1fr}
  .scenario-grid,.results{grid-template-columns:1fr}
  .controls label{grid-template-columns:1fr}
  output{text-align:left}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto}}