.upgrade-path {
    position: relative;
    padding: 30px 0;
}
.version-step {
    position: relative;
    padding: 25px;
    margin-bottom: 30px;
    border-radius: 8px;
    background: white;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border-left: 5px solid #2196f3;
}
.version-badge {
    position: absolute;
    top: -28px;
    left: -15px;
    background: #2196f3;
    color: white;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}
.breaking-change {
    border-left-color: #f44336;
    background: #ffebee;
}
.breaking-change .version-badge {
    background: #f44336;
}
.deprecation-notice {
    background: #fff3e0;
    border-left: 4px solid #ff9800;
    padding: 15px;
    margin: 20px 0;
    border-radius: 4px;
}
.migration-tool {
    background: #e8f5e9;
    border: 1px solid #4CAF50;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
}
.compatibility-table {
    margin: 25px 0;
}
.compatibility-table th {
    background: #f5f5f5;
}
.timeline-container {
    position: relative;
    padding-left: 50px;
    margin: 30px 0;
}
.timeline-line {
    position: absolute;
    left: 25px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #2196f3;
}
.timeline-item {
    position: relative;
    margin-bottom: 30px;
}
.timeline-dot {
    position: absolute;
    left: -33px;
    top: 0;
    width: 16px;
    height: 16px;
    background: #2196f3;
    border-radius: 50%;
    border: 3px solid white;
}
.checklist-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 15px;
}
.checklist-icon {
    margin-right: 10px;
    color: #4CAF50;
    font-size: 1.2em;
}
.version-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 25px 0;
}
.comparison-card {
    padding: 20px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    position: relative;
}
.danger-zone {
    border-color: #f44336;
    background: #ffebee;
}
.warning-zone {
    border-color: #ff9800;
    background: #fff3e0;
}
.safe-zone {
    border-color: #4CAF50;
    background: #e8f5e9;
}