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

body {
    font-family: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: #0c0a09;
    background-color: #ffffff;
    padding: 20px;
}

h1 {
    font-size: 40px;
    font-weight: 300;
    margin-bottom: 40px;
    max-width: 480px;
}

.container {
    display: flex;
    flex-direction: row;
    max-width: 1200px;
    margin: 0 auto;
    gap: 40px;
    position: relative;
}

.left-panel {
    width: 480px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.model-viewer {
    flex: 1;
    position: relative;
    height: 600px;
    background-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
}

#model-video {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.component-menu {
    display: flex;
    flex-direction: column;
    width: 100%;
}

.component-item {
    display: flex;
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 0;
    cursor: pointer;
    border-bottom: 1px solid #f1f1f1;
}

.component-header {
    display: flex;
    align-items: center;
    width: 100%;
}

.component-number {
    font-family: 'Geist Mono', monospace;
    font-size: 16px;
    font-weight: 400;
    color: #999;
    width: 40px;
    opacity: 0.6;
}

.component-item.active .component-number {
    color: #e11d48;
    opacity: 1;
}

.component-item h3 {
    font-size: 16px;
    font-weight: 400;
    color: #777;
    margin-left: 5px;
}

.component-item.active h3 {
    color: #000;
    font-weight: 500;
}

.component-description {
    margin-top: 10px;
    font-size: 14px;
    line-height: 1.5;
    color: #555;
    width: 100%;
    padding-left: 45px;
    display: none;
}

.component-item.active .component-description {
    display: block;
}

@media (max-width: 1024px) {
    .container {
        flex-direction: column;
    }
    
    .left-panel {
        width: 100%;
    }
    
    .model-viewer {
        height: 400px;
    }
}