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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 1200px;
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    font-weight: 600;
}

.header p {
    font-size: 1.1em;
    opacity: 0.95;
}

.viewer-container {
    position: relative;
    width: 100%;
    height: 600px;
    background: #f5f5f5;
}

model-viewer {
    width: 100%;
    height: 100%;
}

.controls {
    background: #f9f9f9;
    padding: 20px;
    border-top: 1px solid #eee;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

.control-group {
    display: flex;
    gap: 10px;
    align-items: center;
}

.control-group label {
    font-weight: 500;
    color: #333;
    font-size: 0.95em;
}

button {
    padding: 8px 16px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95em;
    font-weight: 500;
    transition: all 0.3s ease;
}

button:hover {
    background: #764ba2;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

button:active {
    transform: translateY(0);
}

.info-panel {
    background: white;
    padding: 20px;
    border-top: 1px solid #eee;
    color: #666;
    font-size: 0.95em;
    line-height: 1.6;
}

.info-panel strong {
    color: #333;
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 1.8em;
    }

    .viewer-container {
        height: 400px;
    }

    .controls {
        flex-direction: column;
        padding: 15px;
    }

    button {
        width: 100%;
    }
}

/* Loading animation */
.loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}