/* CSS Filter Generator - Styles */

/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-hover: #5558e3;
    --primary-light: #e0e7ff;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --background: #f8fafc;
    --surface: #ffffff;
    --surface-hover: #f1f5f9;
    --border: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 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: 8px;
    --radius-lg: 12px;
    --transition: 0.2s ease;
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

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

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

/* Header */
.header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem;
    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: 0.95rem;
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem;
    width: 100%;
    display: grid;
    gap: 1.5rem;
}

@media (min-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto auto auto;
    }

    .preview-section {
        grid-column: 1;
        grid-row: 1 / 3;
    }

    .controls-section {
        grid-column: 2;
        grid-row: 1 / 3;
    }

    .presets-section {
        grid-column: 1;
        grid-row: 3;
    }

    .custom-chains-section {
        grid-column: 2;
        grid-row: 3;
    }

    .output-section {
        grid-column: 1 / -1;
        grid-row: 4;
    }
}

/* Section Styles */
section {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
}

section h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Preview Section */
.preview-container {
    padding: 1.25rem;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}

.preview-actions {
    display: flex;
    gap: 0.5rem;
}

.preview-wrapper {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.preview-image-container {
    background: linear-gradient(45deg, #e5e5e5 25%, transparent 25%),
                linear-gradient(-45deg, #e5e5e5 25%, transparent 25%),
                linear-gradient(45deg, transparent 75%, #e5e5e5 75%),
                linear-gradient(-45deg, transparent 75%, #e5e5e5 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    background-color: #f5f5f5;
    border-radius: var(--radius);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

#previewImage {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
    display: block;
    transition: filter var(--transition);
}

.comparison-toggle {
    display: flex;
    justify-content: center;
}

/* Controls Section */
.controls-section {
    display: flex;
    flex-direction: column;
    max-height: 600px;
}

.controls-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
}

.controls-actions {
    display: flex;
    gap: 0.5rem;
}

.filter-controls {
    padding: 1.25rem;
    overflow-y: auto;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

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

.filter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.filter-header label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

.filter-value {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary-color);
    background: var(--primary-light);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    min-width: 60px;
    text-align: center;
}

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

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: transform var(--transition), box-shadow var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

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

/* Drop Shadow Control */
.drop-shadow-control .filter-header {
    margin-bottom: 0.5rem;
}

.drop-shadow-inputs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
    opacity: 0.5;
    pointer-events: none;
    transition: opacity var(--transition);
}

.drop-shadow-inputs.enabled {
    opacity: 1;
    pointer-events: auto;
}

.shadow-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.shadow-input-group label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.shadow-input-group input[type="number"] {
    width: 100%;
    padding: 0.4rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.85rem;
    text-align: center;
}

.shadow-input-group input[type="color"] {
    width: 100%;
    height: 32px;
    padding: 2px;
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
}

.shadow-input-group span {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: center;
}

/* Presets Section */
.presets-header {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
}

.presets-grid {
    padding: 1.25rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 0.75rem;
    max-height: 300px;
    overflow-y: auto;
}

.preset-btn {
    padding: 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}

.preset-btn:hover {
    background: var(--surface-hover);
    border-color: var(--primary-color);
}

.preset-btn .preset-preview {
    width: 100%;
    height: 50px;
    background: linear-gradient(135deg, #6366f1, #ec4899, #f59e0b);
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.preset-btn .preset-name {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* Custom Chains Section */
.chains-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
}

.chains-list {
    padding: 1.25rem;
    max-height: 250px;
    overflow-y: auto;
}

.no-chains {
    color: var(--text-muted);
    text-align: center;
    padding: 2rem;
    font-size: 0.9rem;
}

.chain-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--surface-hover);
    border-radius: var(--radius);
    margin-bottom: 0.5rem;
}

.chain-item:last-child {
    margin-bottom: 0;
}

.chain-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    flex: 1;
    min-width: 0;
}

.chain-name {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.chain-preview {
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chain-actions {
    display: flex;
    gap: 0.5rem;
}

/* Output Section */
.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
}

.code-output {
    padding: 1.25rem;
    background: #1e293b;
    max-height: 200px;
    overflow: auto;
}

.code-output pre {
    margin: 0;
}

.code-output code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    color: #e2e8f0;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    white-space: nowrap;
}

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

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

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

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

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

.btn-ghost:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.btn-danger {
    background: transparent;
    color: var(--danger-color);
}

.btn-danger:hover {
    background: #fef2f2;
}

.btn-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
}

/* Toggle */
.toggle-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
}

.toggle-label.small {
    font-size: 0.85rem;
}

.toggle-label input[type="checkbox"] {
    width: 40px;
    height: 22px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--border);
    border-radius: 11px;
    position: relative;
    cursor: pointer;
    transition: background var(--transition);
}

.toggle-label.small input[type="checkbox"] {
    width: 36px;
    height: 20px;
}

.toggle-label input[type="checkbox"]::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    background: white;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: transform var(--transition);
    box-shadow: var(--shadow-sm);
}

.toggle-label.small input[type="checkbox"]::before {
    width: 16px;
    height: 16px;
}

.toggle-label input[type="checkbox"]:checked {
    background: var(--primary-color);
}

.toggle-label input[type="checkbox"]:checked::before {
    transform: translateX(18px);
}

.toggle-label.small input[type="checkbox"]:checked::before {
    transform: translateX(16px);
}

.toggle-text {
    color: var(--text-secondary);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    position: relative;
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    transform: scale(0.95);
    transition: transform var(--transition);
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 1.25rem;
}

.modal-body label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.modal-body input[type="text"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.modal-body input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1.25rem;
    border-top: 1px solid var(--border);
}

/* Toast */
.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);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1001;
}

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

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

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

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

.footer a:hover {
    text-decoration: underline;
}

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

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

    .main-content {
        padding: 1rem;
    }

    .preview-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .preview-actions {
        width: 100%;
    }

    .preview-actions .btn {
        flex: 1;
        justify-content: center;
    }

    .controls-section {
        max-height: none;
    }

    .drop-shadow-inputs {
        grid-template-columns: repeat(2, 1fr);
    }

    .chains-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .chains-header .btn {
        width: 100%;
        justify-content: center;
    }

    .chain-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .chain-actions {
        width: 100%;
    }

    .chain-actions .btn {
        flex: 1;
        justify-content: center;
    }

    .output-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

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

@media (max-width: 480px) {
    .presets-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

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

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

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