body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding: 2rem;
    background: #f5f5f5;
    margin: 0;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 2rem;
}

h1 {
    color: #2c3e50;
    text-align: center;
    margin-bottom: 2rem;
}

.qr-message {
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

.qr-message-valid {
    background: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

.qr-message-invalid {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.qr-message-winner {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    color: #856404;
}

.qr-message-used {
    background: #e2e3e5;
    border: 1px solid #d6d8db;
    color: #383d41;
}

.qr-message-exceed {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.qr-reward-image {
    text-align: center;
    margin: 15px 0;
}

.ads {
    margin-top: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    text-align: center;
}

.feedback {
    margin-top: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
}

.feedback h3 {
    color: #495057;
    margin-top: 0;
}

form.feedback-form textarea {
    width: 100%;
    height: 80px;
    padding: 10px;
    border: 1px solid #ced4da;
    border-radius: 4px;
}

.feedback-form input,
.feedback-form select {
    padding: 8px;
    border: 1px solid #ced4da;
    border-radius: 4px;
}

.feedback-form button,
.winner-form button {
    background: #007cba;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.feedback-form button:hover,
.winner-form button:hover {
    background: #005a87;
}

.winner-form {
    background: #fff3cd;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

.winner-form h3 {
    color: #856404;
    margin-top: 0;
}

.winner-form input {
    width: 100%;
    padding: 8px;
    margin: 5px 0 10px 0;
    border: 1px solid #ced4da;
    border-radius: 4px;
}