:root {
    --bg: #fcfcfc;
    --text: #333;
    --border: #ddd;
    --accent: #eee;
    --top-bar: #fff;
    --font-main: 'Segoe UI', system-ui, sans-serif;
    --font-code: 'Courier New', Courier, monospace;
}

body, html {
    margin: 0; padding: 0; height: 100%;
    font-family: var(--font-main);
    background: var(--bg); color: var(--text);
    overflow: hidden; display: flex; flex-direction: column;
}

.top-bar {
    display: flex; justify-content: space-between; align-items: center;
    padding: 10px 15px; background: var(--top-bar);
    border-bottom: 1px solid var(--border); z-index: 100;
}

.nav-tabs { display: flex; gap: 10px; }
.nav-btn {
    padding: 8px 16px; border: 1px solid var(--border);
    background: #fff; border-radius: 4px; cursor: pointer;
    font-family: var(--font-main); font-weight: bold; color: #555;
}
.nav-btn.active { background: #e0e0e0; color: #000; }

.file-controls { display: flex; gap: 8px; align-items: center; }
.icon-btn {
    background: none; border: 1px solid var(--border); padding: 6px 10px;
    cursor: pointer; border-radius: 4px; font-size: 14px;
    display: flex; align-items: center; justify-content: center; gap: 5px;
    transition: all 0.2s ease;
}
.icon-btn svg { width: 18px; height: 18px; fill: currentColor; }
.icon-btn:hover { background: var(--accent); }

/* Color inversion for active Code mode */
.icon-btn.active-invert { background: var(--text); color: var(--bg); border-color: var(--text); }

.file-dropdown {
    position: absolute; top: 50px; left: 0; width: 100%;
    background: #fff; border-bottom: 1px solid var(--border);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05); transform: translateY(-100%);
    transition: transform 0.3s ease; z-index: 90; max-height: 40vh; overflow-y: auto;
}
.file-dropdown.open { transform: translateY(0); }
.file-list { list-style: none; margin: 0; padding: 0; }
.file-list li {
    padding: 12px 20px; border-bottom: 1px solid #f0f0f0;
    cursor: pointer; display: flex; justify-content: space-between; align-items: center;
}
.file-list li:hover { background: var(--accent); }
.file-title { font-weight: bold; font-size: 14px; }
.file-right-panel { display: flex; align-items: center; gap: 12px; }
.file-date { font-size: 12px; color: #888; }
.list-delete-btn { background: none; border: none; font-size: 12px; color: #aaa; cursor: pointer; padding: 0; }
.list-delete-btn:hover { color: #d9534f; }

.view-container {
    flex-grow: 1; position: relative; display: none; height: 100%;
}
.view-container.active { display: flex; flex-direction: column; }

.editor-wrapper {
    position: relative; flex-grow: 1; display: flex; overflow: hidden;
    background: #fff;
}

.line-numbers {
    width: 40px; background: #f9f9f9; border-right: 1px solid var(--border);
    text-align: right; padding: 20px 5px 20px 0; font-family: var(--font-code);
    font-size: 14px; line-height: 1.6; color: #999; overflow: hidden;
    user-select: none; display: none;
}

.code-overlay, .editor-textarea {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    padding: 20px; box-sizing: border-box; font-size: 16px; line-height: 1.6;
    margin: 0; border: none; outline: none; overflow-y: auto;
}

.code-overlay {
    z-index: 1; pointer-events: none; font-family: var(--font-code);
    white-space: pre-wrap; word-wrap: break-word; color: transparent;
    display: none;
}

.editor-textarea {
    z-index: 2; background: transparent; color: var(--text);
    font-family: var(--font-main); resize: none;
}

.editor-wrapper.code-mode .line-numbers { display: block; }
.editor-wrapper.code-mode .editor-textarea {
    left: 45px; width: calc(100% - 45px); font-family: var(--font-code);
    color: transparent; caret-color: #000;
}
.editor-wrapper.code-mode .code-overlay {
    display: block; left: 45px; width: calc(100% - 45px); color: #333;
}

.stats-bar {
    text-align: right; padding: 5px 20px; font-size: 11px; color: #999;
    background: #fff; border-top: 1px solid var(--border);
}

.board-viewport {
    width: 100%; height: 100%; overflow: auto; position: relative;
    background: #f0f0f0; 
}

.board-canvas {
    width: 3000px; height: 3000px; position: absolute;
    background-image: radial-gradient(#ccc 1px, transparent 1px);
    background-size: 20px 20px;
    top: 0; left: 0;
}

.board-tools {
    position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%);
    display: flex; gap: 10px; background: white; padding: 10px;
    border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); z-index: 50;
}

.draggable {
    position: absolute; background: white; border: 1px solid var(--border);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1); border-radius: 4px;
    display: flex; flex-direction: column; z-index: 10;
}

.drag-handle {
    height: 25px; background: rgba(0,0,0,0.05); cursor: move;
    display: flex; justify-content: space-between; align-items: center;
    padding: 0 5px; touch-action: none; border-bottom: 1px solid rgba(0,0,0,0.05); position: relative;
}

.close-btn { background: none; border: none; font-size: 14px; cursor: pointer; color: #666; padding: 0 5px; }

/* Note Specifics */
.note-body {
    border: none; outline: none; padding: 10px; resize: both;
    min-width: 150px; min-height: 150px; font-family: var(--font-main); font-size: 14px;
}
.palette-btn { width: 14px; height: 14px; border-radius: 50%; cursor: pointer; border: 1px solid rgba(0,0,0,0.3); padding: 0; margin-left: 5px; }
.color-dropdown {
    display: none; position: absolute; top: 100%; left: 0; background: white;
    border: 1px solid var(--border); border-radius: 4px; padding: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1); z-index: 20; gap: 5px; flex-direction: row;
}
.color-dropdown.show { display: flex; }
.dot { width: 14px; height: 14px; border-radius: 50%; cursor: pointer; border: 1px solid rgba(0,0,0,0.1); }

/* Table Specifics */
.table-widget { resize: both; overflow: auto; min-width: 150px; min-height: 100px; display: flex; flex-direction: column;}
.board-table { border-collapse: collapse; margin: 0; width: 100%; flex-grow: 1; } 
.board-table td {
    border: 1px solid #ccc; padding: 2px;
    min-width: 10px; height: auto; outline: none; font-size: 14px;
}
.table-controls { display: flex; gap: 5px; justify-content: center; padding: 4px; background: #fafafa; border-top: 1px solid #eee; }
.table-controls button { font-size: 11px; padding: 2px 6px; cursor: pointer; border: 1px solid #ccc; background: white; border-radius: 2px; }

/* Sketch & Image Widgets */
.sketch-widget { resize: both; overflow: hidden; min-width: 150px; min-height: 150px; width: 150px; height: 150px; background: #fff;}
.sketch-widget canvas { flex-grow: 1; width: 100%; height: 100%; display: block; touch-action: none; cursor: crosshair;}

.image-widget { 
    resize: both; overflow: hidden; min-width: 50px; min-height: 50px; 
    background: transparent; border: none !important; box-shadow: none !important; 
}
.image-widget img { 
    width: 100%; height: 100%; object-fit: contain; display: block; 
    cursor: move; user-select: none; -webkit-user-drag: none; 
}
.img-close-btn { 
    position: absolute; top: 0; right: 0; background: rgba(255,255,255,0.7); 
    border: none; font-size: 14px; cursor: pointer; color: #333; 
    padding: 2px 6px; border-bottom-left-radius: 4px; z-index: 5;
}
.img-close-btn:hover { background: rgba(255,255,255,1); color: #d9534f; }