:root{--primary: #2ecc71;--bg-blue: #0b5394;--text-dark: #333;--white: #ffffff;--gray-light: #f4f7f6;--error: #e74c3c}*{box-sizing:border-box;margin:0;padding:0;font-family:Inter,sans-serif}body{background:var(--bg-blue);color:var(--text-dark)}.auth-container,.calculator-wrapper{display:flex;justify-content:center;align-items:center;min-height:100vh;padding:20px}.container{background:var(--white);width:100%;max-width:500px;border-radius:12px;box-shadow:0 10px 25px #0003;overflow:hidden;padding:30px}header{text-align:center;margin-bottom:25px}header h1{font-size:1.5rem;color:var(--text-dark);margin-bottom:5px}header p{font-size:.9rem;color:#666}.tag-premium{background:#f1c40f;color:#000;padding:2px 8px;border-radius:4px;font-size:.7rem;font-weight:700;display:inline-block;margin-bottom:10px}.form-group{margin-bottom:20px}label{display:block;font-size:.85rem;font-weight:600;margin-bottom:8px;color:var(--text-dark)}input,select{width:100%;padding:12px;border:1px solid #ddd;border-radius:8px;font-size:1rem;outline:none;transition:border-color .3s}input:focus{border-color:var(--primary)}button{width:100%;padding:15px;background:var(--primary);color:#fff;border:none;border-radius:8px;font-weight:700;font-size:1rem;cursor:pointer;transition:transform .2s,background .3s}button:active{transform:scale(.98)}button:disabled{background:#ccc;cursor:not-allowed}.card-result{background:var(--gray-light);padding:15px;border-radius:8px;margin-top:10px}.price-final{font-size:1.8rem;color:var(--primary);font-weight:700;text-align:center;display:block;margin:10px 0}footer{text-align:center;margin-top:20px;color:#000;font-size:.8rem}.error-message{color:var(--error);font-size:.9rem;margin-top:5px;display:block}.link-text{text-align:center;margin-top:15px;font-size:.9rem}.link-text a{color:var(--bg-blue);text-decoration:none;font-weight:700}