*{box-sizing:border-box}body{margin:0;font-family:system-ui,sans-serif;background:#f4f5f7;color:#222}
header{background:#1d3557;color:#fff;padding:12px;position:sticky;top:0}h1{margin:0 0 8px;font-size:20px}
nav{display:flex;gap:6px;overflow-x:auto}nav button{flex:1;padding:8px;border:0;border-radius:8px;background:#457b9d;color:#fff;font-size:14px}
nav button.on{background:#f1c40f;color:#000}main{padding:12px;max-width:640px;margin:auto}
.card{background:#fff;border-radius:10px;padding:12px;margin-bottom:10px;box-shadow:0 1px 3px #0002}
.ex{background:#ffe8a3;padding:6px 10px;border-radius:8px;font-weight:600;margin-bottom:10px}
.neg{color:#c0392b}.pos{color:#27ae60}.flag{color:#fff;background:#c0392b;border-radius:6px;padding:2px 6px;font-size:12px}
input{width:70px;padding:4px}footer{text-align:center;padding:20px}a.btn{display:inline-block;padding:10px 14px;background:#1d3557;color:#fff;border-radius:8px;text-decoration:none}