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

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

.container {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    max-width: 1200px;
    width: 100%;
    display: flex;
    gap: 40px;
}

.form-wrapper {
    flex: 1;
    min-width: 0;
}

.qr-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

h1 {
    color: #333;
    font-size: 28px;
    margin-bottom: 8px;
    text-align: center;
}

.subtitle {
    color: #666;
    text-align: center;
    margin-bottom: 1em;
    font-size: 14px;
}

.remember-section {
    margin-bottom: 0.6em;
    padding: 12px;
    background: #f8f9fa;
    border-radius: 8px;
}

.form-group {
    margin-bottom: 0.5em;
}

.form-group label {
    display: block;
    color: #333;
    font-weight: 500;
    margin-bottom: 0.3em;
    font-size: 14px;
}

.form-group input[type="text"],
.form-group input[type="number"] {
    width: 100%;
    padding: 0.6em 0.8em;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input[type="text"]:focus,
.form-group input[type="number"]:focus {
    outline: none;
    border-color: #667eea;
}

.form-group input[type="text"]:invalid,
.form-group input[type="number"]:invalid {
    border-color: #ef4444;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 6px;
    color: #666;
    font-size: 13px;
    white-space: nowrap;
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.form-group small {
    display: block;
    color: #999;
    font-size: 12px;
    margin-top: 4px;
}

#qr-container {
    margin-top: 40px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#qr-canvas-wrapper {
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#qrcode {
    border-radius: 8px;
    max-width: 100%;
    height: auto;
    display: block;
}

.share-btn {
    margin-top: 20px;
    padding: 14px 32px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.share-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.share-btn:active:not(:disabled) {
    transform: translateY(0);
}

.share-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.error-message {
    margin-top: 20px;
    padding: 12px;
    background: #fee;
    color: #c33;
    border-radius: 8px;
    font-size: 14px;
    display: none;
}

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

footer {
    margin-top: auto;
    padding-top: 40px;
    text-align: center;
}

footer a {
    color: #99a8eb;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

footer a:hover {
    text-decoration: underline;
}

footer p {
    margin: 0;
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
        max-width: 600px;
        padding: 24px;
        gap: 24px;
    }
    
    h1 {
        font-size: 24px;
    }
    
    #qr-container {
        margin-top: 0;
    }
}