:root {
    /* Colors */
    --color-primary: #070707;
    --color-primary-hover: #2a2a2a;
    --color-success: #4CAF50;
    --color-success-hover: #45a049;
    --color-info: #2196F3;
    --color-error: #f44336;
    
    --color-bg-gradient-start: #e8d5e8;
    --color-bg-gradient-end: #d5e8e8;
    
    --color-surface: rgba(255, 255, 255, 0.9);
    --color-surface-solid: #ffffff;
    --color-border: #e0e0e0;
    
    --color-text-primary: #070707;
    --color-text-secondary: #666666;
    --color-text-inverse: #ffffff;
    
    /* Font */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-lg: 24px;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    
    /* Spacing */
    --radius-sm: 6px;
    --radius-md: 12px;
    
    /* Panel */
    --panel-width: 320px;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    background: linear-gradient(135deg, var(--color-bg-gradient-start) 0%, var(--color-bg-gradient-end) 100%);
    overflow: hidden;
    height: 100vh;
    color: var(--color-text-primary);
}

/* Canvas */
#canvas-container {
    width: 100%;
    height: 100vh;
    position: absolute;
    top: 0;
    left: 0;
    transition: left 0.3s ease;
}

#canvas-container.panel-open {
    left: var(--panel-width);
    width: calc(100% - var(--panel-width));
}

/* Left Panel */
.left-panel {
    position: fixed;
    top: 0;
    left: calc(-1 * var(--panel-width));
    width: var(--panel-width);
    height: 100vh;
    background: var(--color-primary);
    z-index: 20;
    transition: left 0.3s ease;
    display: flex;
    flex-direction: column;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.2);
}

.left-panel.open {
    left: 0;
}

.panel-header {
    padding: 24px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.panel-header h2 {
    font-family: var(--font-family);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-inverse);
    margin: 0;
}

.panel-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

/* Panel Toggle Button */
.panel-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 30;
    transition: left 0.3s ease;
}

.panel-toggle.panel-open {
    left: calc(var(--panel-width) + 20px);
}

.toggle-btn {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 12px 14px;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    width: 44px;
    height: 44px;
}

.toggle-btn:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
}

.toggle-btn.open {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
}

/* Joint Sliders */
.joint-group {
    margin-bottom: 20px;
}

.joint-group-title {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-inverse);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.joint-slider-item {
    margin-bottom: 16px;
    margin-left: 20px;
}

.joint-slider-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.joint-slider-label span {
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-inverse);
}

.joint-slider-label .joint-value {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
}

.joint-slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.2);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.joint-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-text-inverse);
    cursor: pointer;
    transition: all 0.2s ease;
}

.joint-slider::-webkit-slider-thumb:hover {
    background: var(--color-surface);
    transform: scale(1.2);
}

.joint-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-text-inverse);
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
}

.joint-slider::-moz-range-thumb:hover {
    background: var(--color-surface);
    transform: scale(1.2);
}

/* Connect Button (Top Left) */
.top-left {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 10;
}

.connect-btn {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 12px 24px;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: var(--radius-sm);
}

.connect-btn:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.connect-btn.connected {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.connect-btn.connected:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

/* Connection Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 100;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--color-surface-solid);
    padding: 40px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    min-width: 400px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.modal-title {
    font-family: var(--font-family);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: 30px;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: 8px;
}

.input-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--color-border);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-primary);
    border-radius: var(--radius-sm);
    background: var(--color-surface-solid);
}

.input-group input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.modal-buttons {
    display: flex;
    gap: 12px;
    margin-top: 30px;
}

.modal-btn {
    flex: 1;
    padding: 12px;
    border: 1px solid var(--color-border);
    background: var(--color-surface-solid);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-primary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

.modal-btn:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.modal-btn.primary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.modal-btn.primary:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

/* Telemetry Data (Top Right) */
.top-right {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 10;
    min-width: 200px;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
}

.telemetry-item {
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-primary);
    line-height: 1.2;
    margin-bottom: 4px;
    font-style: italic;
}

.no-data {
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-style: italic;
}

/* Loading Status (Bottom Left) */
.file-upload {
    position: absolute;
    bottom: 20px;
    left: 20px;
    z-index: 10;
    transition: left 0.3s ease;
}

.file-upload.panel-open {
    left: calc(var(--panel-width) + 20px);
}

.status-message {
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-normal);
    padding: 10px 15px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
}

.status-message.loading {
    border-color: var(--color-surface);
    color: var(--color-text-primary);
}

.status-message.success {
    border-color: var(--color-surface);
    color: var(--color-text-primary);
}

.status-message.error {
    border-color: var(--color-error);
    color: var(--color-error);
}

/* Scrollbar for panel */
.panel-content::-webkit-scrollbar {
    width: 6px;
}

.panel-content::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
}

.panel-content::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

.panel-content::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Scrollbar */
.top-right::-webkit-scrollbar {
    width: 4px;
}

.top-right::-webkit-scrollbar-track {
    background: transparent;
}

.top-right::-webkit-scrollbar-thumb {
    background: rgba(7, 7, 7, 0.3);
    border-radius: 2px;
}