body {
    font-family: system-ui, -apple-system, sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: #121212;
    color: #eee;
}

#drop-zone {
    width: 80%;
    max-width: 600px;
    height: 300px;
    border: 3px dashed #444;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 50px 0;
    transition: border-color 0.3s;
    background: #1e1e1e;
    color: #eee;
}

#drop-zone.drag-over {
    border-color: #007bff;
    background: #252a33;
}

#app {
    width: 95%;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding-bottom: 50px;
}

.canvas-container, .graph-container {
    background: #222;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.5);
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    color: white;
}

canvas {
    width: 100%;
    max-height: 500px;
    border: 1px solid #444;
    background: #1a1a1a;
}

.graph-controls {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-bottom: 10px;
}

.unit-toggle {
    font-size: 14px;
    cursor: pointer;
    user-select: none;
}

.stats-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    padding: 20px;
    background: #2a2a2a;
    color: #eee;
    font-family: monospace;
    border-radius: 8px;
    margin-top: 20px;
    justify-content: space-between;
}

.stats-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
    min-width: 200px;
}

.stats-item {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    border-bottom: 1px solid #444;
    padding-bottom: 4px;
}

.stats-label {
    color: #aaa;
}

.stats-value {
    font-weight: bold;
    text-align: right;
}

button {
    padding: 10px 20px;
    cursor: pointer;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    font-weight: bold;
}

button:disabled {
    background: #444;
    color: #888;
    cursor: not-allowed;
}

select {
    padding: 10px;
    border-radius: 5px;
    background: #333;
    color: white;
    border: 1px solid #555;
}

.tooltip {
    position: fixed;
    padding: 8px 12px;
    background: rgba(0, 0, 0, 0.9);
    color: white;
    border-radius: 4px;
    font-size: 12px;
    pointer-events: none;
    display: none;
    z-index: 1000;
    border: 1px solid #555;
    white-space: pre-line;
    box-shadow: 0 2px 5px rgba(0,0,0,0.5);
}