:root {
    --primary-color: #3498db;
    --success-color: #2ecc71;
    --danger-color: #e74c3c;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: #f5f7fa;
    color: #333;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 30px auto;
    padding: 30px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: var(--dark-color);
    margin-bottom: 10px;
}

p {
    text-align: center;
    color: #7f8c8d;
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
}

input[type="text"],
input[type="color"],
select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    transition: border 0.3s;
}

input[type="text"]#url {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    transition: border 0.3s;
}

input[type="text"]:focus,
select:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

.error-message {
    color: var(--danger-color);
    font-size: 14px;
    margin-top: 5px;
    display: none;
}

button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 20px;
    font-size: 16px;
    border-radius: 6px;
    cursor: pointer;
    width: 100%;
    transition: all 0.3s;
    font-weight: 600;
}

button:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

.result-container {
    margin-top: 30px;
    text-align: center;
    padding: 25px;
    border-radius: 8px;
    background-color: #f8f9fa;
    border: 1px dashed #ddd;
    display: none;
}

#qrCodeContainer {
    margin: 20px 0;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #eee;
}

#qrCodeContainer img {
    max-width: 100%;
    height: auto;
    border: 1px solid #eee;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.placeholder {
    color: #95a5a6;
    font-style: italic;
}

.download-options {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 20px;
}

.download-btn {
    width: auto;
    padding: 10px 15px;
    font-size: 14px;
}

.download-btn:nth-child(1) {
    background: var(--success-color);
}

.download-btn:nth-child(1):hover {
    background: #27ae60;
}

.download-btn:nth-child(2) {
    background: #9b59b6;
}

.download-btn:nth-child(2):hover {
    background: #8e44ad;
}

.download-btn:nth-child(3) {
    background: var(--danger-color);
}

.download-btn:nth-child(3):hover {
    background: #c0392b;
}

input[type="color"] {
    height: 45px;
    padding: 2px;
    cursor: pointer;
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }
    
    .download-options {
        flex-direction: column;
    }
    
    .download-btn {
        width: 100%;
    }
}