*{box-sizing:border-box;font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,'Helvetica Neue',Arial}
body{max-width:960px;margin:0 auto;padding:24px;background:#f7f7fb;color:#222}
h2,h3{margin:0 0 12px}
header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
nav a{color:#3366cc;text-decoration:none}
.card{background:#fff;padding:16px;border-radius:12px;box-shadow:0 2px 6px rgba(0,0,0,0.08);margin-bottom:16px}
.balance{font-size:28px;font-weight:700}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px}
.tile{background:#fff;padding:16px;border-radius:12px;box-shadow:0 2px 6px rgba(0,0,0,0.06)}
.btn{display:inline-block;padding:10px 14px;border-radius:8px;border:1px solid #337ab7;text-decoration:none}
.btn.primary{background:#2f6fed;color:#fff;border-color:#2f6fed}
table{width:100%;border-collapse:collapse}
th,td{padding:8px;border-bottom:1px solid #eee;text-align:left}
.error{color:#c00}
input[type=text],input[type=email],input[type=password],input[type=number]{width:100%;padding:8px;margin:6px 0 12px;border:1px solid #ccc;border-radius:8px}