*{margin:0;padding:0;box-sizing:border-box}
:root{--c-text:#1a1a1a;--c-muted:#666;--c-border:#e5e5e5;--c-bg:#fafafa;--c-card:#fff;--c-link:#2563eb;--c-accent:#1d4ed8;--c-danger:#dc2626;--c-ok:#16a34a}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;color:var(--c-text);line-height:1.5;background:var(--c-bg);min-height:100vh}
.container{max-width:640px;margin:0 auto;padding:2rem 1.5rem}
header{text-align:center;margin-bottom:2rem}
header h1{font-size:1.8rem;margin-bottom:.5rem}
header p{color:var(--c-muted)}
.card{background:var(--c-card);border:1px solid var(--c-border);border-radius:12px;padding:2rem;margin-bottom:1.5rem;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.card h2{font-size:1.2rem;margin-bottom:1rem}
label{display:block;font-size:.9rem;font-weight:600;margin-bottom:.35rem;color:#444}
.field{margin-bottom:1rem}
input[type=number],input[type=email],input[type=text],select{width:100%;padding:.65rem .75rem;border:1px solid var(--c-border);border-radius:6px;font-size:1rem;background:#fff}
input:focus,select:focus{outline:none;border-color:var(--c-link);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
button{width:100%;padding:.85rem 1.5rem;border:0;border-radius:6px;background:var(--c-link);color:#fff;font-size:1rem;font-weight:600;cursor:pointer;transition:background .15s}
button:hover{background:var(--c-accent)}
button:disabled{background:#9ca3af;cursor:not-allowed}
.result{background:linear-gradient(135deg,#2563eb 0%,#1d4ed8 100%);color:#fff;padding:2rem;border-radius:12px;text-align:center;display:none}
.result.show{display:block}
.result .big{font-size:3rem;font-weight:700;margin:.5rem 0}
.result .small{opacity:.85;font-size:.95rem}
.result .cta{display:inline-block;margin-top:1.5rem;background:#fff;color:var(--c-link);padding:.75rem 1.5rem;border-radius:6px;text-decoration:none;font-weight:600}
.note{font-size:.85rem;color:var(--c-muted);margin-top:.5rem}
.error{color:var(--c-danger);font-size:.9rem;margin-top:.5rem;min-height:1.2rem}
.muted{color:var(--c-muted);font-size:.9rem}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin:1.5rem 0}
.stat{background:rgba(255,255,255,.15);padding:1rem;border-radius:8px}
.stat .label{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;opacity:.8}
.stat .value{font-size:1.3rem;font-weight:700;margin-top:.25rem}
footer{text-align:center;color:var(--c-muted);font-size:.85rem;padding:2rem 0}
footer a{color:var(--c-link)}