:root{--bg:#f4f7fb;--card:#fff;--ink:#102a43;--muted:#52606d;--accent:#1d5fd1;--accent-d:#164aa6;--line:#d9e2ec}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
header,footer{background:var(--accent);color:#fff;padding:14px 16px}
header a,footer a{color:#fff;text-decoration:none}
header .wrap,footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
.logo{font-weight:800;font-size:1.1rem}
nav a{margin-left:14px;font-size:.95rem;opacity:.95}
main{max-width:760px;margin:0 auto;padding:20px 16px}
.wrap{max-width:760px;margin:0 auto}
h1{font-size:1.7rem;line-height:1.25;margin:.2em 0}
h2{font-size:1.25rem;margin-top:1.6em}
.sub{color:var(--muted);margin-top:0}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;margin:16px 0}
.form{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}
label{display:block;font-weight:600;margin:12px 0 4px;font-size:.95rem}
input{width:100%;padding:11px;font-size:1rem;border:1px solid var(--line);border-radius:8px}
.full{grid-column:1/-1}
button{margin-top:16px;width:100%;padding:13px;font-size:1.05rem;font-weight:700;color:#fff;background:var(--accent);border:0;border-radius:8px;cursor:pointer}
button:hover{background:var(--accent-d)}
.results{display:none}
.big{font-size:1.6rem;font-weight:800;color:var(--accent)}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}
.stat{background:var(--bg);border-radius:8px;padding:12px}
.stat span{display:block;color:var(--muted);font-size:.85rem}
.stat b{font-size:1.15rem}
.good{background:#e6f4ea;border-left:4px solid #1e8e3e;padding:10px 12px;border-radius:6px;margin-top:12px}
.warn{background:#fff4e5;border-left:4px solid #e08a00;padding:10px 12px;border-radius:6px;margin-top:12px}
.bad{background:#fdecec;border-left:4px solid #c0392b;padding:10px 12px;border-radius:6px;margin-top:12px}
.ad{min-height:90px;margin:16px 0;text-align:center;color:#9aa3b2;font-size:.8rem}
.note{font-size:.85rem;color:var(--muted)}
@media(max-width:560px){.form,.grid{grid-template-columns:1fr}}