body{font:16px/1.55 system-ui,sans-serif;margin:0;color:#1d2433;background:#fafbfc}header{display:flex;gap:1rem;align-items:center;padding:.8rem 1.2rem;background:#fff;border-bottom:1px solid #e3e6ea}.brand{font-weight:700;color:#0b5;text-decoration:none}nav a{margin-right:1rem;color:#334}main{max-width:820px;margin:auto;padding:1rem 1.2rem}.disc{background:#fff6d6;padding:.5rem 1.2rem;font-size:.9rem;text-align:center}textarea,select{width:100%;font:inherit;margin:.3rem 0 1rem}label{display:block;font-weight:600}.chk{font-weight:400}button,.buy{background:#0a7c4a;color:#fff;border:0;padding:.7rem 1.2rem;border-radius:6px;font-size:1rem;cursor:pointer;text-decoration:none;display:inline-block}.small{font-size:.85rem;color:#556}.warn{background:#fdecea;padding:.6rem;border-radius:6px}.note{background:#eef6ff;padding:.6rem;border-radius:6px}.plans{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.plan{background:#fff;border:1px solid #dde;padding:1rem;border-radius:8px}table{border-collapse:collapse;width:100%}td,th{border:1px solid #dde;padding:.4rem}footer{font-size:.85rem;color:#556;text-align:center;padding:2rem 1rem}#result{background:#fff;border:1px solid #dde;border-radius:8px;padding:1rem;margin-top:1rem}