/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --success-color: #22c55e;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;

    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --border-color: #334155;
    --border-light: #475569;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Reset & Base */
*, *::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, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    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(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
}

.header-content {
    max-width: 1800px;
    margin: 0 auto;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

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

.tagline {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 280px 1fr 320px;
    flex: 1;
    overflow: hidden;
}

/* Control Panel */
.controls-panel {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 1.25rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.control-section {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 1rem;
}

.control-section h2 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.control-group {
    margin-bottom: 1rem;
}

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

.control-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.375rem;
}

/* Input Styles */
input[type="text"],
input[type="number"] {
    width: 100%;
    padding: 0.5rem 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="text"]:focus,
input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

input[type="text"]::placeholder {
    color: var(--text-muted);
}

.input-with-btn {
    display: flex;
    gap: 0.5rem;
}

.input-with-btn input {
    flex: 1;
}

.btn-small {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 1.25rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

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

/* Range Input */
.range-with-value {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

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

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

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

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

.value-input {
    width: 60px !important;
    text-align: center;
    flex-shrink: 0;
}

/* Color Palette */
.area-colors {
    margin-bottom: 1rem;
}

.area-colors label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.375rem;
}

.color-palette {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.color-btn {
    width: 28px;
    height: 28px;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.color-btn:hover {
    transform: scale(1.1);
}

.color-btn.active {
    border-color: white;
    box-shadow: 0 0 0 2px var(--bg-primary);
}

/* Help Text */
.help-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

/* Areas List */
.areas-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 200px;
    overflow-y: auto;
}

.area-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
}

.area-color-indicator {
    width: 12px;
    height: 12px;
    border-radius: 2px;
    flex-shrink: 0;
}

.area-name {
    flex: 1;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-primary);
}

.area-position {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.area-delete-btn {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.area-delete-btn:hover {
    color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.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-sm);
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn:active {
    transform: scale(0.98);
}

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

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

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

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

.btn-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--border-light);
}

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

/* Grid Workspace */
.grid-workspace {
    display: flex;
    flex-direction: column;
    padding: 1.25rem;
    background: var(--bg-primary);
    overflow: hidden;
}

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

.workspace-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

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

/* Grid Container */
.grid-container {
    flex: 1;
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    min-height: 400px;
}

.grid-preview {
    position: absolute;
    inset: 20px;
    display: grid;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 19px,
        rgba(255, 255, 255, 0.03) 19px,
        rgba(255, 255, 255, 0.03) 20px
    ),
    repeating-linear-gradient(
        90deg,
        transparent,
        transparent 19px,
        rgba(255, 255, 255, 0.03) 19px,
        rgba(255, 255, 255, 0.03) 20px
    );
}

.grid-preview.hide-lines {
    background: none;
}

/* Grid Cells */
.grid-cell {
    position: relative;
    border: 1px dashed var(--border-color);
    transition: background-color var(--transition-fast);
    cursor: crosshair;
    min-height: 40px;
}

.grid-cell:hover {
    background: rgba(99, 102, 241, 0.1);
}

.grid-cell.selecting {
    background: rgba(99, 102, 241, 0.2);
}

.grid-cell.has-area {
    cursor: pointer;
}

.grid-cell .cell-label {
    position: absolute;
    top: 4px;
    left: 4px;
    font-size: 0.625rem;
    color: var(--text-muted);
    font-family: monospace;
}

/* Named Areas */
.named-area {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    color: white;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    cursor: move;
    transition: opacity var(--transition-fast);
    z-index: 10;
}

.named-area:hover {
    opacity: 0.9;
}

/* Selection Overlay */
.selection-overlay {
    position: absolute;
    pointer-events: none;
    background: rgba(99, 102, 241, 0.3);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-sm);
    z-index: 20;
    display: none;
}

.selection-overlay.active {
    display: block;
}

/* Code Panel */
.code-panel {
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

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

.code-header h2 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.code-output {
    flex: 1;
    margin: 0;
    padding: 1rem 1.25rem;
    background: var(--bg-primary);
    overflow: auto;
    font-family: 'SF Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.code-output code {
    display: block;
    white-space: pre-wrap;
    word-break: break-word;
}

/* Syntax Highlighting */
.code-output .property {
    color: #7dd3fc;
}

.code-output .value {
    color: #fde68a;
}

.code-output .selector {
    color: #c4b5fd;
}

.code-output .comment {
    color: var(--text-muted);
}

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

.footer p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

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

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

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

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

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

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

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

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.btn-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-body {
    flex: 1;
    padding: 1.25rem;
    overflow-y: auto;
}

.export-options {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
}

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

.export-code {
    margin: 0;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    font-family: 'SF Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--text-primary);
    max-height: 300px;
    overflow: auto;
}

.export-code code {
    display: block;
    white-space: pre-wrap;
    word-break: break-word;
}

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

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 200;
    opacity: 0;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
}

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

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--danger-color);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 260px 1fr;
    }

    .code-panel {
        position: fixed;
        right: 0;
        top: 0;
        bottom: 0;
        width: 320px;
        transform: translateX(100%);
        transition: transform var(--transition-normal);
        z-index: 50;
    }

    .code-panel.active {
        transform: translateX(0);
    }
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .controls-panel {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        width: 280px;
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
        z-index: 50;
    }

    .controls-panel.active {
        transform: translateX(0);
    }

    .header {
        padding: 0.75rem 1rem;
    }

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

    .grid-workspace {
        padding: 1rem;
    }
}

@media (max-width: 600px) {
    .header-content {
        text-align: center;
    }

    .logo-section {
        justify-content: center;
    }

    .grid-container {
        min-height: 300px;
    }

    .modal-content {
        width: 95%;
        max-height: 90vh;
    }

    .footer p {
        font-size: 0.8125rem;
    }
}

/* Mobile menu toggle button - added via JS */
.mobile-menu-toggle {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    width: 56px;
    height: 56px;
    background: var(--primary-color);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    z-index: 40;
    display: none;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.mobile-menu-toggle:hover {
    background: var(--primary-hover);
}

.mobile-menu-toggle:active {
    transform: scale(0.95);
}

@media (max-width: 900px) {
    .mobile-menu-toggle {
        display: flex;
    }
}

/* Overlay for mobile panels */
.panel-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 45;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.panel-overlay.active {
    opacity: 1;
    visibility: visible;
}

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

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

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

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