:root {
    --primary: #4361ee;
    --primary-dark: #3a56d4;
    --secondary: #3f37c9;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

.container {
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    padding: 30px;
    width: 100%;
    max-width: 500px;
    text-align: center;
}

h1 {
    color: var(--primary);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.tabs {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 1px solid #e9ecef;
}

.tab {
    padding: 10px 20px;
    cursor: pointer;
    font-weight: 500;
    color: var(--gray);
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
}

.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.input-group {
    margin-bottom: 20px;
    text-align: left;
}

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

input[type="text"], 
input[type="number"],
input[type="email"],
input[type="tel"],
select,
textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    box-sizing: border-box;
    transition: all 0.3s ease;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.color-input {
    height: 45px;
    padding: 5px;
}

button {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    width: 100%;
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

#qrcode {
    margin: 30px auto;
    display: flex;
    justify-content: center;
    padding: 20px;
    border: 1px dashed #ddd;
    border-radius: 8px;
    min-height: 200px;
    background-color: white;
}

.download-btn {
    background-color: var(--primary);
    display: none;
    margin-top: 20px;
}

.download-btn:hover {
    background-color: var(--primary-dark);
}

.options {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.option-group {
    flex: 1;
}

.logo-upload {
    margin-bottom: 20px;
}

.logo-preview {
    width: 60px;
    height: 60px;
    object-fit: contain;
    border: 1px dashed #ccc;
    border-radius: 4px;
    display: none;
    margin-top: 10px;
}

.qr-actions {
    display: flex;
    gap: 10px;
}

.qr-actions button {
    flex: 1;
}

@media (max-width: 600px) {
    .options {
        flex-direction: column;
    }
    
    .qr-actions {
        flex-direction: column;
    }
}

/* Animation */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}