:root {
    --dng-primary: #4a6fa5;
    --dng-primary-dark: #3a5a8c;
    --dng-primary-light: #e8f0fe;
    --dng-text: #2d3748;
    --dng-text-light: #718096;
    --dng-border: #e2e8f0;
    --dng-bg: #f8fafc;
    --dng-card-bg: #ffffff;
    --dng-success: #38a169;
    --dng-error: #e53e3e;
    --dng-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --dng-radius: 8px;
}

/* Base Styles */
.dng-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--dng-text);
}

.dng-card {
    background: var(--dng-card-bg);
    border-radius: var(--dng-radius);
    box-shadow: var(--dng-shadow);
    padding: 2rem;
    margin-bottom: 2rem;
}

.dng-card h2 {
    color: var(--dng-primary);
    margin-top: 0;
}

/* Form Styles */
.dng-form-group {
    margin-bottom: 1.5rem;
}

.dng-form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dng-text);
}

.dng-input, .dng-select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--dng-border);
    border-radius: var(--dng-radius);
    font-size: 1rem;
    transition: all 0.2s;
}

.dng-input:focus, .dng-select:focus {
    outline: none;
    border-color: var(--dng-primary);
    box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.2);
}

.dng-form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

/* Radio Buttons */
.dng-radio-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.dng-radio {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.dng-radio input {
    margin-right: 0.5rem;
}

/* Buttons */
.dng-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--dng-primary);
    color: white;
    border: none;
    padding: 0.875rem 1.75rem;
    border-radius: var(--dng-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
    margin-top: 0.5rem;
}

.dng-button:hover {
    background: var(--dng-primary-dark);
    transform: translateY(-1px);
}

.dng-button:active {
    transform: translateY(0);
}

.dng-button-secondary {
    background: white;
    color: var(--dng-primary);
    border: 1px solid var(--dng-primary);
}

.dng-button-secondary:hover {
    background: var(--dng-primary-light);
}

/* Results */
.dng-results {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--dng-border);
    display: none;
}

.dng-results h3 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--dng-primary);
}

.dng-names-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.dng-name-item {
    background: var(--dng-bg);
    border: 1px solid var(--dng-border);
    border-radius: var(--dng-radius);
    padding: 1rem;
    text-align: center;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
}

.dng-name-item:hover {
    background: var(--dng-primary-light);
    border-color: var(--dng-primary);
    transform: translateY(-2px);
}

.dng-name-item.copied {
    background: var(--dng-primary);
    color: white;
    border-color: var(--dng-primary);
}

.dng-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1.5rem;
}

.dng-actions .dng-button {
    width: auto;
    margin: 0;
}

/* Loading Spinner */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.dng-spinner {
    display: none;
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
    margin-left: 0.5rem;
}

/* Error Message */
.dng-error {
    display: none;
    align-items: center;
    gap: 1rem;
    background: #fef2f2;
    color: var(--dng-error);
    padding: 1rem;
    border-radius: var(--dng-radius);
    margin-top: 1.5rem;
    border-left: 4px solid var(--dng-error);
}

.dng-error-icon {
    font-size: 1.5rem;
}

.dng-error-message {
    flex: 1;
}

/* Responsive Design */
@media (max-width: 768px) {
    .dng-form-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .dng-actions {
        flex-direction: column;
    }
    
    .dng-actions .dng-button {
        width: 100%;
    }
}