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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #2c3e50;
}

h2 {
    color: #3498db;
    margin-bottom: 15px;
    border-bottom: 2px solid #3498db;
    padding-bottom: 5px;
}

.input-section, .settings-section, .action-section, .preview-section {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.input-method {
    margin-bottom: 15px;
}

.input-method label {
    margin-right: 20px;
    cursor: pointer;
}

.input-area {
    margin-top: 10px;
}

#data-input {
    width: 100%;
    height: 150px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: inherit;
    resize: vertical;
}

#file-input {
    margin: 10px 0;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 15px;
}

.setting-item {
    display: flex;
    flex-direction: column;
}

.setting-item label {
    margin-bottom: 5px;
    font-weight: bold;
}

.setting-item input, .setting-item select {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.logo-upload {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #eee;
}

.action-section {
    text-align: center;
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 12px 24px;
    font-size: 16px;
    border-radius: 4px;
    cursor: pointer;
    margin: 0 10px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

button:disabled {
    background-color: #bdc3c7;
    cursor: not-allowed;
}

#preview-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}

.qr-item {
    background: white;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.qr-item canvas {
    max-width: 100%;
    height: auto;
}

.qr-item .content {
    margin-top: 10px;
    font-size: 14px;
    word-break: break-all;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.qr-item .index {
    font-weight: bold;
    color: #3498db;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
    }
    
    #preview-container {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}