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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    overflow: hidden;
}

.container {
    width: 100vw;
    height: 100vh;
    position: relative;
}

.controls {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.9);
    padding: 10px 15px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.control-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 6px;
    background: #007bff;
    color: white;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn:hover {
    background: #0056b3;
    transform: scale(1.05);
}

.control-btn:active {
    transform: scale(0.95);
}

#resetView {
    font-size: 12px;
    width: auto;
    padding: 0 12px;
}

#zoomLevel {
    font-weight: 600;
    color: #333;
    min-width: 50px;
    text-align: center;
}

.mindmap-container {
    width: 100%;
    height: 100%;
    overflow: hidden;
    cursor: grab;
    background: #fff;
    position: relative;
}

.mindmap-container.dragging {
    cursor: grabbing;
}

.mindmap-wrapper {
    width: 100%;
    height: 100%;
    transform-origin: center center;
    transition: transform 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

#mindmapSvg {
    max-width: none;
    max-height: none;
    width: auto;
    height: auto;
    display: block;
    pointer-events: none;
}

/* Instructions overlay */
.instructions {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 15px;
    border-radius: 8px;
    font-size: 14px;
    max-width: 300px;
    z-index: 1000;
}

.instructions h4 {
    margin-bottom: 8px;
    color: #ffd700;
}

.instructions ul {
    list-style: none;
    padding: 0;
}

.instructions li {
    margin: 4px 0;
    padding-left: 16px;
    position: relative;
}

.instructions li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: #ffd700;
}