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

:root {
    --bg-primary: #1e1e2e;
    --bg-secondary: #181825;
    --bg-surface: #313244;
    --text-primary: #cdd6f4;
    --text-secondary: #a6adc8;
    --text-muted: #6c7086;
    --accent: #89b4fa;
    --accent-hover: #b4befe;
    --success: #a6e3a1;
    --error: #f38ba8;
    --warning: #f9e2af;
    --border: #45475a;
    --divider: #585b70;
}

html, body {
    height: 100%;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
}

header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

header h1 {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent);
}

header .subtitle {
    color: var(--text-muted);
    font-size: 13px;
}

header .header-right {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 12px;
}

header .credits {
    font-size: 12px;
    color: var(--text-muted);
}

header .credits a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

header .credits a:hover {
    color: var(--accent);
}

header .github-link {
    color: var(--text-secondary);
    font-size: 18px;
    display: flex;
    align-items: center;
    transition: color 0.2s;
}

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

header .status {
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 4px;
    background: var(--bg-surface);
}

header .status.ready {
    color: var(--success);
}

header .status.error {
    color: var(--error);
}

main {
    display: flex;
    height: calc(100% - 49px);
    min-height: 0; /* Important for flex children to shrink properly */
    overflow: hidden;
}

.pane {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 200px;
    min-height: 0; /* Important for flex children to shrink properly */
    overflow: hidden;
}

.pane-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.pane-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.type-display {
    font-size: 13px;
    color: var(--success);
    max-width: 60%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pane-header button {
    padding: 4px 12px;
    font-size: 12px;
    font-family: inherit;
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s;
}

.pane-header button:hover {
    background: var(--accent-hover);
}

.editor-container {
    flex: 1;
    overflow: hidden;
    position: relative;
    min-height: 0; /* Important for flex children to shrink properly */
}

.divider {
    width: 4px;
    background: var(--border);
    cursor: col-resize;
    transition: background 0.2s;
}

.divider:hover,
.divider.dragging {
    background: var(--accent);
}

/* CodeMirror overrides */
.CodeMirror {
    position: absolute !important;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    height: auto !important;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace !important;
    font-size: 14px;
    line-height: 1.5;
    background: var(--bg-primary) !important;
}

.CodeMirror-gutters {
    background: var(--bg-secondary) !important;
    border-right: 1px solid var(--border) !important;
}

.CodeMirror-linenumber {
    color: var(--text-muted) !important;
}

/* Output display */
#output-editor {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: auto;
    padding: 12px 16px;
    font-size: 14px;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
}

#output-editor .comment {
    color: #6272a4;
}

#output-editor .keyword {
    color: #ff79c6;
}

#output-editor .string {
    color: #f1fa8c;
}

#output-editor .number {
    color: #bd93f9;
}

#output-editor .function-name {
    color: #50fa7b;
}

#output-editor .type-annotation {
    color: #8be9fd;
    font-style: italic;
}

#output-editor .operator {
    color: #ff79c6;
}

#output-editor .punctuation {
    color: #f8f8f2;
}

#output-editor .identifier {
    color: #f8f8f2;
}

#output-editor .property {
    color: #66d9ef;
}

/* Error panel */
.error-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-top: 2px solid var(--error);
    max-height: 200px;
    display: none;
    flex-direction: column;
}

.error-panel.visible {
    display: flex;
}

.error-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 16px;
    background: rgba(243, 139, 168, 0.1);
    color: var(--error);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.error-header button {
    background: none;
    border: none;
    color: var(--error);
    font-size: 16px;
    cursor: pointer;
    padding: 0 4px;
}

.error-content {
    flex: 1;
    overflow: auto;
    padding: 12px 16px;
}

.error-item {
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}

.error-item:last-child {
    border-bottom: none;
}

.error-item .message {
    color: var(--error);
}

.error-item .location {
    color: var(--text-muted);
    font-size: 12px;
    margin-top: 4px;
}

/* Error underlines in input */
.error-underline {
    text-decoration: underline wavy var(--error);
    background: rgba(243, 139, 168, 0.15);
}

/* Loading state */
.loading #output-editor::after {
    content: 'Checking types...';
    color: var(--text-muted);
}

/* Empty state */
.empty-state {
    color: var(--text-muted);
    font-style: italic;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--bg-surface);
    border-radius: 5px;
}

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

/* Responsive */
@media (max-width: 768px) {
    main {
        flex-direction: column;
    }

    .divider {
        width: 100%;
        height: 4px;
        cursor: row-resize;
    }

    .pane {
        min-height: 200px;
    }
}