.sponsor-box {
    max-width: 450px;
    margin: 30px auto;
    padding: 25px;
    border-radius: 12px;
    background: linear-gradient(135deg, #74ebd5, #acb6e5);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    text-align: center;
    color: #333;
}

.sponsor-title {
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 15px;
    background: linear-gradient(45deg, #ff4e50, #f9d423);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.input-group {
    margin: 10px 0;
    text-align: left;
}

.input-group label {
    font-weight: 600;
    color: #444;
}

.input-group input {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 6px;
}

.note-line {
    font-size: 13px;
    color: #222;
    margin: 5px 0 10px 0;
    font-style: italic;
}

.button-group {
    margin-top: 15px;
}

#check-btn, #reset-btn {
    background: linear-gradient(45deg, #36d1dc, #5b86e5);
    border: none;
    color: white;
    padding: 10px 20px;
    margin: 5px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
}

#reset-btn {
    background: linear-gradient(45deg, #ff416c, #ff4b2b);
}

#check-btn:hover, #reset-btn:hover {
    opacity: 0.9;
}

.result-box {
    margin-top: 20px;
    background: #fff;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

@media (max-width: 480px) {
    .sponsor-box {
        width: 90%;
        padding: 15px;
    }
}