*{box-sizing:border-box;margin:0;padding:0}body{background:#f5f7fa;color:#1a3a5c;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased;font-size:17px}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:#f1f1f1}::-webkit-scrollbar-thumb{background:#cbd5e0;border-radius:3px}input::placeholder,textarea::placeholder{color:#9ca3af}input,textarea,select{font-size:16px!important;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}button{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.rank-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}@media(max-width:620px){.rank-grid{grid-template-columns:1fr}}.how-cards{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;max-width:640px;margin:0 auto}.how-card{flex:1 1 160px;max-width:200px;background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:18px 14px;box-shadow:0 1px 3px #0000000f}@keyframes spin{to{transform:rotate(360deg)}}