#kepler-app-container {
    --billy-orange: #F5A623; 
    --billy-blue: #008080; 
    --bg-light: #f9f9f9; 
    --slate-200: #e2e8f0;
    --slate-500: #64748b;
    --slate-800: #1e293b;
    
    font-family: 'Segoe UI', 'Microsoft JhengHei', sans-serif !important;
    background: var(--bg-light) !important; 
    border-radius: 12px !important; 
    margin: 20px auto !important; 
    max-width: 800px !important;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05) !important; 
    border-top: 4px solid var(--billy-blue) !important; 
    overflow: hidden !important;
    color: #333 !important;
    line-height: 1.6 !important;
    display: block !important;
}

#kepler-app-container * { 
    box-sizing: border-box !important; 
    margin: 0 !important; 
    padding: 0 !important; 
}

#kepler-app-container .kepler-header {
    padding: 20px 25px !important;
    border-bottom: 1px solid var(--slate-200) !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    background: #fff !important;
    gap: 15px !important;
}

#kepler-app-container .status-badge {
    padding: 6px 24px !important;
    border-radius: 9999px !important;
    font-size: 0.85rem !important;
    font-weight: 700 !important;
    text-align: center !important;
    transition: all 0.3s ease !important;
    display: inline-block !important;
}
#kepler-app-container .status-running { background: #fee2e2 !important; color: #b91c1c !important; border: 1px solid #fecaca !important; animation: kepler-pulse 2s infinite !important; }
#kepler-app-container .status-paused { background: #e2e8f0 !important; color: #475569 !important; border: 1px solid #cbd5e1 !important; }

#kepler-app-container .hud-display {
    text-align: center !important;
    width: 100% !important;
    padding: 15px !important;
    background: var(--bg-light) !important;
    border-radius: 8px !important;
    border: 1px solid var(--slate-200) !important;
    position: relative !important;
}
#kepler-app-container .hud-display::before {
    content: '' !important;
    position: absolute !important;
    top: 0 !important; left: 0 !important; right: 0 !important; height: 4px !important;
    background: linear-gradient(90deg, var(--billy-blue), var(--billy-orange)) !important;
    border-radius: 8px 8px 0 0 !important;
}
#kepler-app-container .hud-title { font-size: 0.85rem !important; font-weight: bold !important; color: var(--slate-500) !important; text-transform: uppercase !important; margin-bottom: 5px !important; }
#kepler-app-container .hud-val { font-size: 1.2rem !important; font-weight: bold !important; color: var(--slate-800) !important; }

#kepler-app-container .law-selectors {
    display: grid !important;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)) !important;
    gap: 10px !important;
    width: 100% !important;
    margin-top: 10px !important;
}
#kepler-app-container .btn-law {
    padding: 10px 15px !important;
    border-radius: 8px !important;
    border: 2px solid var(--slate-200) !important;
    background: white !important;
    color: var(--slate-800) !important;
    font-weight: bold !important;
    cursor: pointer !important;
    transition: all 0.2s !important;
    text-align: center !important;
    font-size: 0.9rem !important;
}
#kepler-app-container .btn-law:hover { background: #f1f5f9 !important; }
#kepler-app-container .btn-law.active { border-color: var(--billy-blue) !important; background: var(--billy-blue) !important; color: white !important; }

#kepler-app-container .diagram-container {
    position: relative !important;
    width: 100% !important;
    background: #0f172a !important;
    border-bottom: 1px solid var(--slate-200) !important;
    aspect-ratio: 3/2 !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    overflow: hidden !important;
}
#kepler-app-container canvas { max-width: 100% !important; height: auto !important; display: block !important; }

#kepler-app-container .zoom-controls { position: absolute !important; bottom: 20px !important; right: 20px !important; display: flex !important; flex-direction: column !important; gap: 8px !important; }
#kepler-app-container .btn-zoom {
    background: rgba(255, 255, 255, 0.85) !important;
    border: 1px solid #cbd5e1 !important;
    width: 40px !important; height: 40px !important;
    border-radius: 8px !important;
    font-size: 1.5rem !important; font-weight: bold !important;
    cursor: pointer !important;
    display: flex !important; justify-content: center !important; align-items: center !important;
    color: #333 !important;
}
#kepler-app-container .btn-zoom:hover { background: white !important; transform: scale(1.05) !important; }

#kepler-app-container .controls {
    padding: 20px !important;
    display: flex !important;
    justify-content: center !important;
    gap: 20px !important;
    background: #fff !important;
    border-bottom: 1px solid var(--slate-200) !important;
}
#kepler-app-container .btn-control {
    background: white !important;
    border: 2px solid var(--billy-blue) !important;
    color: var(--billy-blue) !important;
    padding: 10px 20px !important;
    border-radius: 8px !important;
    font-weight: bold !important;
    cursor: pointer !important;
    display: flex !important;
    align-items: center !important;
    gap: 8px !important;
    font-size: 1rem !important;
}
#kepler-app-container .btn-control:hover { background: #f0f8f8 !important; }

#kepler-app-container .sliders-wrapper { padding: 25px !important; background: #fff !important; display: flex !important; flex-direction: column !important; gap: 20px !important; }
#kepler-app-container .slider-group { display: flex !important; flex-direction: column !important; gap: 10px !important; }
#kepler-app-container .slider-header { display: flex !important; justify-content: space-between !important; align-items: center !important; font-weight: bold !important; font-size: 0.9rem !important; margin-bottom: 5px !important; }
#kepler-app-container .val-badge { background: var(--bg-light) !important; border: 1px solid var(--slate-200) !important; padding: 2px 6px !important; border-radius: 4px !important; font-family: monospace !important; }

#kepler-app-container input[type=range] { -webkit-appearance: none !important; width: 100% !important; background: transparent !important; margin: 10px 0 !important; }
#kepler-app-container input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none !important; height: 20px !important; width: 20px !important; border-radius: 50% !important;
    background: var(--billy-blue) !important; cursor: pointer !important; margin-top: -7px !important; 
    border: 2px solid white !important; box-shadow: 0 2px 4px rgba(0,0,0,0.3) !important;
}
#kepler-app-container input[type=range]::-webkit-slider-runnable-track { width: 100% !important; height: 6px !important; background: var(--slate-200) !important; border-radius: 3px !important; }

#kepler-app-container .planet-btn {
    padding: 6px 14px !important; font-size: 0.85rem !important; border-radius: 9999px !important; border: 1px solid var(--slate-200) !important;
    background: #f8fafc !important; color: var(--slate-500) !important; cursor: pointer !important; transition: all 0.2s !important;
}
#kepler-app-container .planet-btn.active { background: #f0fdfa !important; border-color: #14b8a6 !important; color: #0f766e !important; font-weight: bold !important; }
#kepler-app-container .dt-btn {
    padding: 10px !important; font-size: 0.9rem !important; border-radius: 6px !important; border: 1px solid var(--slate-200) !important;
    background: #f8fafc !important; cursor: pointer !important; flex: 1 !important; text-align: center !important; transition: all 0.2s !important;
}
#kepler-app-container .dt-btn.active { background: #0d9488 !important; color: white !important; border-color: #0d9488 !important; font-weight: bold !important; }
#kepler-app-container .btn-row { display: flex !important; gap: 10px !important; flex-wrap: wrap !important; }

@keyframes kepler-pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.7; } }
#kepler-app-container .no-select { user-select: none !important; -webkit-user-select: none !important; }