/* Global Styles */
:root {
    --bg-primary: #1e1e1e;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3d3d3d;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent: #4a9eff;
    --accent-hover: #6db3ff;
    --border: #404040;
    --success: #4caf50;
    --cell-bg: #252525;
    --subpixel-off: #333333;
    --subpixel-on: #ffffff;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

/* Layout */
#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Menu Bar */
.menu-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0 0.5rem;
    height: 32px;
    flex-shrink: 0;
    position: relative;
    z-index: 100;
}

.menu-bar-left {
    display: flex;
    align-items: center;
}

.menu-bar-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.github-link {
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    transition: color 0.15s ease;
}

.github-link:hover {
    color: var(--accent);
}

.menu-item {
    position: relative;
}

.menu-trigger {
    background: none;
    border: none;
    color: var(--text-primary);
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
    cursor: pointer;
    border-radius: 4px;
}

.menu-trigger:hover,
.menu-item.open .menu-trigger {
    background-color: var(--bg-tertiary);
}

.menu-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    min-width: 220px;
    padding: 0.25rem 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    z-index: 101;
}

.menu-item.open .menu-dropdown {
    display: block;
}

.menu-dropdown button {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0.375rem 1rem;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    text-align: left;
}

.menu-dropdown button:hover {
    background-color: var(--accent);
    color: white;
}

.menu-dropdown hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 0.25rem 0;
}

.menu-shortcut {
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin-left: 2rem;
}

.menu-dropdown button:hover .menu-shortcut {
    color: rgba(255,255,255,0.7);
}

/* Toolbar Strip */
.toolbar-strip {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0.375rem 0.75rem;
    flex-shrink: 0;
    flex-wrap: wrap;
}

.toolbar-tools {
    display: flex;
    gap: 0.25rem;
    flex-wrap: wrap;
}


/* Tool Buttons */
.tool-btn {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.5rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8125rem;
    transition: all 0.15s;
    white-space: nowrap;
}

.tool-btn:hover {
    background-color: #454545;
}

.tool-btn.active {
    background-color: var(--accent);
    border-color: var(--accent);
}

.tool-btn .icon {
    font-size: 0.875rem;
}

/* Color Picker */
.color-row {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.color-row label {
    font-size: 0.8125rem;
}

.color-row input[type="color"] {
    width: 32px;
    height: 24px;
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    padding: 0;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Sidebar Colors */
.sidebar-colors {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.color-row.color-inactive input[type="color"] {
    opacity: 0.3;
    pointer-events: none;
}

.color-row.color-inactive label:first-child {
    color: var(--text-secondary);
    opacity: 0.5;
}

/* Main Area */
main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Context Panel */
.context-panel {
    width: 200px;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border);
    padding: 0.75rem;
    overflow-y: auto;
    flex-shrink: 0;
}

.context-panel section + section {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

.context-panel h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    letter-spacing: 0.5px;
}

/* Character Palette */
.char-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin-bottom: 0.5rem;
}

.tab-btn {
    padding: 0.25rem 0.5rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.75rem;
}

.tab-btn.active {
    background-color: var(--accent);
    color: white;
}

.char-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 2px;
    max-height: 400px;
    overflow-y: auto;
}

.char-grid button {
    aspect-ratio: 1 / 2;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: 'Noto Sans Symbols 2', 'Segoe UI Symbol', monospace;
    font-size: 1rem;
    cursor: pointer;
    border-radius: 2px;
    padding: 0;
    overflow: hidden;
}

.char-grid button img {
    width: 100%;
    height: 100%;
    display: block;
    image-rendering: pixelated;
}

.char-grid button:hover {
    background-color: #454545;
}

.char-grid button.selected {
    background-color: var(--accent);
    border-color: var(--accent);
}

/* Box line style buttons */
.box-style-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.box-style-btn,
.box-fill-btn {
    padding: 0.375rem 0.75rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
    text-align: left;
    transition: all 0.15s;
}

.box-style-btn:hover,
.box-fill-btn:hover {
    background-color: #454545;
}

.box-style-btn.active,
.box-fill-btn.active {
    background-color: var(--accent);
    border-color: var(--accent);
}

/* Render Toggle */
.render-toggle {
    display: flex;
    gap: 0.25rem;
}

.render-mode-btn {
    flex: 1;
    padding: 0.375rem 0.5rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8125rem;
    transition: all 0.15s;
}

.render-mode-btn:hover {
    background-color: #454545;
}

.render-mode-btn.active {
    background-color: var(--accent);
    border-color: var(--accent);
}

/* Editor Area */
.editor-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    overflow: hidden;
}

.canvas-container {
    flex: 1;
    overflow: auto;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1rem;
    min-height: 200px;
}

/* Canvas Grid */
.canvas {
    position: relative;
    background-color: var(--bg-secondary);
    user-select: none;
}

.cell {
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background-color: var(--cell-bg);
    width: 16px;
    height: 32px;
    position: absolute;
    cursor: crosshair;
    border: 1px solid var(--border);
    box-sizing: content-box;
    contain: layout style paint;
}

.cell img {
    width: 100%;
    height: 100%;
    display: block;
}

/* Subpixel overlay for selection/paste preview highlighting */
.subpixel-overlay {
    position: absolute;
    width: 50%;
    height: 33.333%;
    pointer-events: none;
    z-index: 1;
}

.cell-char {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: 'Cascadia Code', 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 24px;
    pointer-events: none;
    opacity: 0.3;
    color: var(--accent);
}

/* Selection styles */
.cell.selected {
    outline: 2px solid var(--accent);
    outline-offset: -2px;
}

.subpixel-overlay.subpixel-selected {
    outline: 1px solid var(--accent);
    outline-offset: -1px;
}

.subpixel-overlay.paste-preview-subpixel {
    outline: 1px dashed var(--success);
    outline-offset: -1px;
}

.cell.paste-preview {
    outline: 2px dashed var(--success);
    outline-offset: -2px;
    opacity: 0.7;
}

/* Box tool preview */
.cell.box-preview {
    outline: 2px solid #ff9800;
    outline-offset: -2px;
}

/* Text cursor */
.cell.text-cursor {
    outline: 2px solid #ffcc00;
    outline-offset: -2px;
    animation: text-cursor-blink 1s step-end infinite;
}

@keyframes text-cursor-blink {
    0%, 100% { outline-color: #ffcc00; }
    50% { outline-color: transparent; }
}

/* Dialog */
dialog {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    padding: 1.5rem;
    max-width: 400px;
}

dialog::backdrop {
    background-color: rgba(0, 0, 0, 0.6);
}

dialog h3 {
    margin-bottom: 1rem;
}

.form-row {
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-row label {
    min-width: 100px;
}

.form-row input[type="number"],
.form-row input[type="range"] {
    flex: 1;
}

.form-row input[type="number"],
.form-row input[type="text"] {
    padding: 0.5rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: 4px;
}

.form-row input[type="text"] {
    flex: 1;
}

.radio-group {
    display: flex;
    gap: 1rem;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    min-width: auto;
    cursor: pointer;
}

.dialog-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 1rem;
}

.dialog-buttons button {
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
}

.dialog-buttons button[type="submit"] {
    background-color: var(--accent);
    border: none;
    color: white;
}

.dialog-buttons button[type="button"] {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .tool-btn span:not(.icon) {
        display: none;
    }
    .tool-btn {
        padding: 0.25rem;
    }
    .context-panel {
        width: 160px;
    }
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: #505050;
}