:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4895ef;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --success-color: #4cc9f0;
    --warning-color: #f8961e;
    --danger-color: #f72585;
    --text-color: #333;
    --bg-color: #ffffff;
    --card-bg: #f8f9fa;
    --border-color: #dee2e6;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --primary-color: #4895ef;
    --secondary-color: #4361ee;
    --accent-color: #3f37c9;
    --light-color: #343a40;
    --dark-color: #f8f9fa;
    --text-color: #f8f9fa;
    --bg-color: #212529;
    --card-bg: #343a40;
    --border-color: #495057;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
    line-height: 1.6;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.app-header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 0;
    box-shadow: var(--shadow);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-toggle button {
    background: none;
    border: none;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle button:hover {
    transform: rotate(30deg);
}

.app-main {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.generator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.settings-panel, .preview-panel {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.settings-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.settings-section h2 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-row {
    display: flex;
    gap: 1rem;
}

.form-row .form-group {
    flex: 1;
}

label {
    font-weight: 500;
    font-size: 0.9rem;
}

.form-control {
    padding: 0.6rem 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.2);
}

input[type="range"] {
    -webkit-appearance: none;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    margin-top: 0.5rem;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

input[type="color"] {
    width: 100%;
    height: 40px;
    padding: 0;
    border: none;
    cursor: pointer;
}

.btn {
    padding: 0.7rem 1.2rem;
    border: none;
    border-radius: 4px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--light-color);
    color: var(--text-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

.btn-download {
    background-color: var(--success-color);
    color: white;
}

.btn-download:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.btn-preset {
    background-color: var(--accent-color);
    color: white;
    font-size: 0.8rem;
    padding: 0.4rem 0.8rem;
}

.btn-preset:hover {
    opacity: 0.9;
}

.preset-section {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.preset-section h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.preset-buttons {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.preview-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.preview-container h2 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.barcode-preview {
    background-color: white;
    padding: 1.5rem;
    border-radius: 4px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
    border: 1px solid var(--border-color);
}

#barcode {
    max-width: 100%;
    height: auto;
}

.preview-controls {
    display: flex;
    gap: 1rem;
}

.details-section {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.details-section h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.details-content p {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.app-footer {
    text-align: center;
    padding: 1rem;
    background-color: var(--card-bg);
    margin-top: 2rem;
    font-size: 0.9rem;
}

.app-footer i {
    color: var(--danger-color);
}

/* Responsive styles */
@media (max-width: 768px) {
    .generator-container {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        flex-direction: column;
        gap: 1rem;
    }
    
    .preview-controls {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}

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

.barcode-preview {
    animation: fadeIn 0.5s ease-out;
}