:root {
    --bg-color: #1e1e2e;
    --panel-bg: #252535;
    --text-color: #cdd6f4;
    --accent-color: #89b4fa;
    --accent-hover: #b4befe;
    --border-color: #313244;
    --font-family: 'Segoe UI', Inter, system-ui, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Toolbar */
.toolbar {
    height: 60px;
    background-color: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
}

.logo {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--accent-color);
}

.actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

.font-controls {
    display: flex;
    gap: 5px;
    margin-right: 10px;
    border-right: 1px solid var(--border-color);
    padding-right: 15px;
}

.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.btn.primary {
    background-color: var(--accent-color);
    color: var(--bg-color);
    font-weight: bold;
}

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

.btn.secondary {
    background-color: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
}

.btn.secondary:hover {
    background-color: rgba(137, 180, 250, 0.1);
}

/* Split Pane */
.split-pane {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
}

.panel:last-child {
    border-right: none;
}

/* Editor */
.editor-panel {
    background-color: var(--bg-color);
}

#markdownInput {
    width: 100%;
    height: 100%;
    background-color: transparent;
    border: none;
    color: var(--text-color);
    padding: 20px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 14px;
    line-height: 1.6;
    resize: none;
    outline: none;
}

/* Visualizer */
.visualizer-panel {
    background-color: var(--panel-bg);
    position: relative;
}

#markmap {
    width: 100%;
    height: 100%;
}