/* CSS Variables for theming */
:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #6b7280;
    --secondary-hover: #4b5563;
    --background-color: #f3f4f6;
    --surface-color: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: 0.2s ease;
}

/* Reset and base styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    color: white;
    padding: 2rem;
    text-align: center;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.header .subtitle {
    opacity: 0.9;
    font-size: 1rem;
}

/* Main content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding: 2rem;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
    flex: 1;
}

/* Control panel */
.controls-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-section {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

.control-section h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

/* Icon grid */
.icon-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    gap: 0.75rem;
}

.icon-option {
    width: 50px;
    height: 50px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--surface-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    padding: 8px;
}

.icon-option:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.icon-option.selected {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.1);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.icon-option svg {
    width: 100%;
    height: 100%;
}

/* Control labels */
.control-label {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.control-label:last-child {
    margin-bottom: 0;
}

.control-label span:first-child {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.control-label select,
.control-label input[type="color"] {
    width: 100%;
    padding: 0.625rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    background: var(--surface-color);
    cursor: pointer;
    transition: border-color var(--transition);
}

.control-label select:hover,
.control-label input[type="color"]:hover {
    border-color: var(--primary-color);
}

.control-label select:focus,
.control-label input[type="color"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.control-label input[type="color"] {
    height: 44px;
    padding: 4px;
}

/* Range inputs */
.control-label input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    appearance: none;
    cursor: pointer;
}

.control-label input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition);
}

.control-label input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.control-label input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
}

.range-value {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: right;
    min-width: 50px;
}

/* Checkbox label */
.checkbox-label {
    flex-direction: row !important;
    align-items: center;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.checkbox-label span {
    margin-left: 0.5rem;
}

/* Preview panel */
.preview-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.preview-section {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

.preview-section h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.preview-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    background: linear-gradient(45deg, #e5e7eb 25%, transparent 25%),
                linear-gradient(-45deg, #e5e7eb 25%, transparent 25%),
                linear-gradient(45deg, transparent 75%, #e5e7eb 75%),
                linear-gradient(-45deg, transparent 75%, #e5e7eb 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
    background-color: #f9fafb;
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: background-color var(--transition);
}

.preview-container.dark-mode {
    background-color: #1f2937;
    background-image: linear-gradient(45deg, #374151 25%, transparent 25%),
                      linear-gradient(-45deg, #374151 25%, transparent 25%),
                      linear-gradient(45deg, transparent 75%, #374151 75%),
                      linear-gradient(-45deg, transparent 75%, #374151 75%);
}

.preview-background {
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-controls {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
}

/* Output section */
.output-section {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

.output-section h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.output-actions {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.code-output {
    background: #1f2937;
    border-radius: var(--radius-md);
    padding: 1rem;
    overflow-x: auto;
    max-height: 300px;
    overflow-y: auto;
}

.code-output pre {
    margin: 0;
}

.code-output code {
    font-family: 'Fira Code', 'Monaco', 'Consolas', monospace;
    font-size: 0.8rem;
    color: #e5e7eb;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Buttons */
.btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

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

.btn-secondary:hover {
    background: var(--secondary-hover);
    transform: translateY(-1px);
}

/* Footer */
.footer {
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
    margin-top: auto;
}

.footer p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition);
}

.footer a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Toast notification */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #1f2937;
    color: white;
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Responsive design */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
        padding: 1.5rem;
    }

    .icon-grid {
        grid-template-columns: repeat(auto-fill, minmax(45px, 1fr));
    }
}

@media (max-width: 768px) {
    .header {
        padding: 1.5rem 1rem;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .main-content {
        padding: 1rem;
        gap: 1rem;
    }

    .control-section,
    .preview-section,
    .output-section {
        padding: 1rem;
    }

    .preview-container {
        min-height: 200px;
        padding: 1rem;
    }

    .output-actions {
        flex-direction: column;
    }

    .output-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .icon-grid {
        grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
        gap: 0.5rem;
    }

    .icon-option {
        width: 40px;
        height: 40px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.25rem;
    }

    .header .subtitle {
        font-size: 0.875rem;
    }

    .control-section h2,
    .preview-section h2,
    .output-section h2 {
        font-size: 1rem;
    }

    .preview-controls {
        flex-direction: column;
    }

    .preview-controls .btn {
        width: 100%;
    }
}

/* Animation for preview */
@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-8px) rotate(2deg); }
    75% { transform: translateY(8px) rotate(-2deg); }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-hover);
}