/* CSS Reset & Variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette base on modern dark themes */
    --bg-main: #121212;
    --bg-pane: #1e1e1e;
    --bg-hover: #2d2d2d;
    --bg-status: #007acc;
    --bg-status-dark: #005f9e;
    
    --text-primary: #e1e1e1;
    --text-secondary: #9cdcfe;
    --text-muted: #858585;
    
    --border-color: #333333;
    --divider-color: #444444;

    --error-color: #f48771;
    --warning-color: #cca700;
    --success-color: #89d185;
    
    --accent: #0e639c;
    --accent-hover: #1177bb;

    --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'Fira Code', 'Consolas', 'Courier New', monospace;
    
    --transition-fast: 0.15s ease;
    --transition-medium: 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

body {
    font-family: var(--font-ui);
    background-color: var(--bg-main);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: background-color var(--transition-medium), color var(--transition-medium);
}

/* Light Mode Overrides */
body.light-mode {
    --bg-main: #f5f5f5;
    --bg-pane: #ffffff;
    --bg-hover: #e5e5e5;
    
    --text-primary: #333333;
    --text-muted: #666666;
    
    --border-color: #cccccc;
    --divider-color: #bbbbbb;

    --error-color: #d13438;
}

body.light-mode .pane-header {
    background-color: #f8f8f8;
}

/* Buttons */
.btn {
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    outline: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.primary-btn {
    background-color: var(--accent);
    color: #fff;
}
.primary-btn:hover:not(:disabled) {
    background-color: var(--accent-hover);
}

.outline-btn {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.outline-btn:hover:not(:disabled) {
    background-color: var(--bg-hover);
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    padding: 4px;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}
.icon-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

/* Main Split View */
.editor-container {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

.pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-pane);
    min-width: 0;
}

.pane-header {
    height: 35px;
    background-color: #1e1e1e;
    color: var(--text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    display: flex;
    align-items: center;
    padding: 0 16px;
    border-bottom: 1px solid var(--border-color);
}

.pane-content {
    flex: 1;
    display: flex;
    padding: 10px;
    position: relative;
}

.editor-wrapper {
    position: relative;
    flex: 1;
    display: flex;
    overflow: hidden;
}

.highlights-backdrop, .transparent-textarea, #output-textarea {
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
    margin: 0;
    border: none;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    white-space: pre;
    overflow: auto;
}

#output-textarea {
    position: relative; /* Output pane uses flex */
    top: auto; left: auto; right: auto; bottom: auto;
    flex: 1;
    background: transparent;
    color: var(--text-primary);
    resize: none;
    outline: none;
}

.transparent-textarea {
    color: var(--text-primary);
    background-color: transparent;
    z-index: 2;
    caret-color: var(--text-primary);
    resize: none;
    outline: none;
}

.highlights-backdrop {
    z-index: 1;
    color: transparent; /* Text is invisible, only background is visible */
    pointer-events: none; /* Let clicks pass through */
    background-color: transparent;
}

.highlights-backdrop mark.conflict-error {
    background-color: rgba(244, 135, 113, 0.3);
    color: transparent;
    border-bottom: 2px dashed var(--error-color);
    padding: 0;
    border-radius: 2px;
}

body.light-mode .highlights-backdrop mark.conflict-error {
    background-color: rgba(209, 52, 56, 0.2); 
}

textarea::placeholder {
    color: #555;
    font-style: italic;
}

textarea[readonly] {
    color: var(--success-color);
}

.pane-divider {
    width: 6px;
    background-color: var(--bg-main);
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    cursor: col-resize;
    z-index: 10;
    transition: background-color var(--transition-fast);
}

.pane-divider:hover {
    background-color: var(--accent);
}

/* Problems Panel Removed */

/* Status Bar */
.status-bar {
    height: 22px;
    background-color: var(--bg-status);
    color: #fff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    padding: 0 8px;
    flex-shrink: 0;
    z-index: 30;
    position: relative;
}

.status-left, .status-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.status-item {
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    height: 22px;
    padding: 0 6px;
    transition: background-color var(--transition-fast);
}

button.status-item {
    background: none;
    border: none;
    color: inherit;
    font-family: inherit;
    font-size: inherit;
}

.status-item:hover {
    background-color: rgba(255,255,255,0.12);
}

.status-text {
    cursor: default;
}
.status-text:hover {
    background-color: transparent;
}

/* Shortcut Tooltip Hover Menu */
.shortcut-menu-container {
    position: relative;
    display: flex;
    align-items: center;
}

.shortcut-tooltip {
    position: absolute;
    bottom: 100%;
    right: 0;
    margin-bottom: 8px; /* Gap above the status bar */
    background-color: #252526;
    border: 1px solid #454545;
    border-radius: 4px;
    padding: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    width: max-content;
    display: flex;
    flex-direction: column;
    gap: 6px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(4px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
    z-index: 100;
}

body.light-mode .shortcut-tooltip {
    background-color: #f3f3f3;
    border-color: #cccccc;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.shortcut-menu-container:hover .shortcut-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.shortcut-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    color: var(--text-primary);
}

.kbd {
    background-color: #333333;
    border: 1px solid #444444;
    border-radius: 3px;
    padding: 2px 6px;
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-secondary);
}

body.light-mode .kbd {
    background-color: #e5e5e5;
    border-color: #cccccc;
}

/* Dynamic State Colors */
.has-errors {
    color: #ffcccc !important;
}

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

.loading-svg {
    animation: spin 1s linear infinite;
}

@keyframes flashButton {
    0% { background-color: rgba(255, 255, 255, 0.4); transform: scale(0.95); }
    100% { background-color: transparent; transform: scale(1); }
}

.active-flash {
    animation: flashButton 0.2s ease-out !important;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #424242;
    border: 2px solid var(--bg-pane);
    border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
    background: #4f4f4f;
}
::-webkit-scrollbar-corner {
    background: transparent;
}

/* Responsive adjustments for PiP / Small windows */
@media (max-width: 768px), (max-height: 500px) {
    .editor-container {
        flex-direction: column;
    }
    .pane {
        min-height: 60px; /* Ensure panes never completely collapse */
        width: 100%;
    }
    .pane-header {
        height: 28px;
        font-size: 11px;
    }
    .pane-content {
        padding: 4px;
    }
    .highlights-backdrop, .transparent-textarea, #output-textarea {
        top: 4px;
        left: 8px; /* give a bit of leading space */
        right: 4px;
        bottom: 4px;
    }
    .pane-divider {
        width: 100%;
        height: 6px;
        border-left: none;
        border-right: none;
        border-top: 1px solid var(--border-color);
        border-bottom: 1px solid var(--border-color);
        cursor: row-resize;
    }
    .btn-text {
        display: none;
    }
    .status-item {
        padding: 0 4px;
    }
    .status-right {
        gap: 6px;
    }
    #status-message {
        max-width: 180px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    .status-item svg {
        margin-right: 0 !important;
    }
    .status-item input[type="checkbox"] {
        margin-right: 0 !important;
    }
}

@media (max-width: 480px) {
    #status-message {
        display: none;
    }
    .status-right {
        gap: 4px;
    }
}