/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    max-width: 500px;
    width: 100%;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 28px;
}

.input-section {
    margin-bottom: 30px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

#url-input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s;
}

#url-input:focus {
    outline: none;
    border-color: #667eea;
}

.description-label {
    display: block;
    margin-top: 16px;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

#description-input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s;
}

#description-input:focus {
    outline: none;
    border-color: #667eea;
}

.error-message {
    color: #e74c3c;
    font-size: 14px;
    margin-top: 8px;
    min-height: 20px;
    display: none;
}

.error-message.show {
    display: block;
}

.qrcode-section {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 250px;
}

#qrcode-container {
    text-align: center;
}

.placeholder {
    color: #999;
    font-size: 16px;
}

#qrcode-container canvas {
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.qrcode-description {
    margin-top: 16px;
    text-align: center;
    color: #555;
    font-size: 14px;
    line-height: 1.6;
    max-width: 100%;
    word-break: break-all;
    display: none;
}

.qrcode-description.show {
    display: block;
}