/* CSS Variables for theming */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --background-color: #f8fafc;
    --panel-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.2s ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

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

/* Header */
.header {
    background: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo svg {
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

/* Main content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
    flex: 1;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
}

/* Panel sections */
.controls-panel, .preview-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.panel-section {
    background: var(--panel-bg);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.panel-section h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

/* Preset grid */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    gap: 0.75rem;
}

.preset-item {
    aspect-ratio: 1;
    background: var(--background-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    transition: var(--transition);
}

.preset-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.preset-item.active {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.preset-item svg {
    width: 100%;
    height: 100%;
    max-width: 40px;
    max-height: 40px;
}

/* Import controls */
.import-controls {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.code-input-container {
    margin-top: 1rem;
}

.code-input-container.hidden {
    display: none;
}

.code-input-container textarea {
    width: 100%;
    height: 120px;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.85rem;
    resize: vertical;
    margin-bottom: 0.75rem;
}

.code-input-container textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Controls group */
.controls-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.control-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-item label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Range control */
.range-control {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.range-control input[type="range"] {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--border-color);
    border-radius: 3px;
    cursor: pointer;
}

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

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

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

.range-value {
    min-width: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    text-align: right;
}

/* Color control */
.color-control {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.color-control input[type="color"] {
    width: 40px;
    height: 40px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    padding: 2px;
}

.color-control input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-control input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 4px;
}

.color-text {
    width: 90px;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: monospace;
    font-size: 0.85rem;
    text-transform: uppercase;
}

.color-text:focus {
    outline: none;
    border-color: var(--primary-color);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary-color);
}

/* Preview section */
.preview-section {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.preview-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    background: repeating-conic-gradient(#e5e5e5 0% 25%, #fff 0% 50%) 50% / 20px 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.preview-background {
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.svg-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.svg-wrapper svg {
    max-width: 100%;
    max-height: 100%;
}

.preview-info {
    margin-top: 0.75rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Export controls */
.export-controls {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.code-preview {
    background: #1e293b;
    border-radius: var(--radius-md);
    padding: 1rem;
    max-height: 200px;
    overflow: auto;
}

.code-preview pre {
    margin: 0;
}

.code-preview code {
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.8rem;
    color: #e2e8f0;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

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

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

.btn-secondary {
    background: var(--background-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

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

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

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: 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: var(--text-primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    opacity: 0;
    transition: all 0.3s ease;
}

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

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

    .preset-grid {
        grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    }
}

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

    .logo h1 {
        font-size: 1.25rem;
    }

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

    .panel-section {
        padding: 1rem;
    }

    .import-controls, .export-controls {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .color-control {
        flex-direction: row;
    }

    .preview-container {
        min-height: 250px;
    }
}

@media (max-width: 480px) {
    .logo {
        flex-direction: column;
        gap: 0.5rem;
    }

    .logo h1 {
        font-size: 1.1rem;
    }

    .tagline {
        font-size: 0.8rem;
    }

    .range-control {
        flex-wrap: wrap;
    }

    .range-value {
        width: 100%;
        text-align: left;
        margin-top: 0.25rem;
    }
}

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

::-webkit-scrollbar-track {
    background: var(--background-color);
}

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

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