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

body {
    font-family: system-ui, -apple-system, sans-serif;
    background: #1e1e1e;
    color: #d4d4d4;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

body.resizing-horizontal,
body.resizing-vertical {
    user-select: none;
}

/* Toolbar */
.toolbar {
    padding: 8px 16px;
    background: #2d2d2d;
    border-bottom: 1px solid #404040;
    display: flex;
    gap: 12px;
    align-items: center;
    flex-shrink: 0;
}

.logo {
    font-size: 16px;
    font-weight: 700;
    color: #e0e0e0;
    margin-right: auto;
    white-space: nowrap;
}

.toolbar select,
.toolbar button {
    font-size: 13px;
    padding: 5px 12px;
    border-radius: 4px;
    border: 1px solid #555;
    background: #3c3c3c;
    color: #d4d4d4;
    cursor: pointer;
}

.toolbar select:hover,
.toolbar button:hover {
    background: #4a4a4a;
}

.toolbar button {
    background: #0e639c;
    border-color: #0e639c;
    color: #fff;
    font-weight: 600;
}

.toolbar button:hover {
    background: #1177bb;
}

.toolbar button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Main layout */
.main {
    flex: 1;
    display: flex;
    overflow: hidden;
    min-height: 0;
}

/* Editor pane (left) */
.editor-pane {
    flex: 0 0 55%;
    display: flex;
    flex-direction: column;
    min-width: 220px;
    min-height: 0;
    overflow: hidden;
}

.editor-section {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.editor-label {
    padding: 4px 12px;
    background: #252525;
    font-size: 11px;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid #333;
    flex-shrink: 0;
}

/* Output pane (right) */
.output-pane {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-width: 220px;
    min-height: 0;
}

.output-label {
    padding: 4px 12px;
    background: #252525;
    font-size: 11px;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid #333;
    flex-shrink: 0;
}

#output {
    flex: 1;
    padding: 12px;
    font-family: 'Fira Code', 'Cascadia Code', 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
    overflow: auto;
    background: #1e1e1e;
    color: #d4d4d4;
    min-height: 0;
}

#output.error {
    color: #f48771;
}

#output.loading {
    color: #888;
    font-style: italic;
}

/* Divider styling */
.panel-divider {
    background: #3a3a3a;
    flex-shrink: 0;
    position: relative;
}

.panel-divider:hover {
    background: #5e5e5e;
}

.panel-divider:active,
body.resizing-horizontal .panel-divider-vertical,
body.resizing-vertical .panel-divider-horizontal {
    background: #7a7a7a;
}

.panel-divider-horizontal {
    height: 6px;
    cursor: row-resize;
}

.panel-divider-horizontal::before,
.panel-divider-vertical::before {
    content: '';
    position: absolute;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.28);
}

.panel-divider-horizontal::before {
    height: 1px;
    left: 24px;
    right: 24px;
    top: 2px;
}

.panel-divider-horizontal::after,
.panel-divider-vertical::after {
    content: '';
    position: absolute;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.28);
}

.panel-divider-horizontal::after {
    height: 1px;
    left: 24px;
    right: 24px;
    top: 3px;
}

.panel-divider-vertical {
    width: 6px;
    cursor: col-resize;
}

.panel-divider-vertical::before {
    width: 1px;
    top: 18px;
    bottom: 18px;
    left: 2px;
}

.panel-divider-vertical::after {
    width: 1px;
    top: 18px;
    bottom: 18px;
    right: 2px;
}

.panel-divider-horizontal,
.panel-divider-vertical {
    touch-action: none;
}

body.resizing-horizontal {
    cursor: col-resize;
}

body.resizing-vertical {
    cursor: row-resize;
}

/* CodeMirror 6 editor containers */
.editor-container,
.driver-container {
    flex: 1;
    overflow: hidden;
    min-height: 0;
}

/* Make the CM6 editor fill its container and use our font stack */
.editor-container .cm-editor,
.driver-container  .cm-editor {
    height: 100%;
    font-family: 'Fira Code', 'Cascadia Code', 'Consolas', 'Monaco', monospace;
    font-size: 13px;
}

.editor-container .cm-scroller,
.driver-container  .cm-scroller {
    overflow: auto;
    line-height: 1.5;
}