#rheostat-app-container {
    --billy-orange: #F5A623; --billy-blue: #008080;
    --bg-light: #f9f9f9; --slate-200: #e2e8f0; --slate-500: #64748b; --slate-800: #1e293b;
    
    font-family: 'Segoe UI', system-ui, sans-serif !important;
    max-width: 800px !important;
    margin: 20px auto !important;
    background: #fff !important;
    border-radius: 12px !important;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05) !important;
    border-top: 4px solid var(--billy-blue) !important;
    overflow: hidden !important;
    display: flex !important;
    flex-direction: column !important;
    user-select: none !important;
    position: relative !important;
    line-height: 1.5 !important;
}

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

/* 強制保護 SVG 線條 */
#rheostat-app-container svg path,
#rheostat-app-container svg line,
#rheostat-app-container svg polyline {
    fill: none !important;
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
}

#rheostat-app-container .app-header { padding: 20px 25px !important; border-bottom: 1px solid var(--slate-200) !important; display: flex !important; flex-direction: column !important; align-items: center !important; gap: 15px !important; background: #fff !important; }
#rheostat-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; border: 1px solid transparent !important; display: inline-block !important; }
#rheostat-app-container .zh-text { font-size: 0.8em !important; font-weight: normal !important; }
#rheostat-app-container .status-running { background: #dcfce7 !important; color: #166534 !important; border-color: #bbf7d0 !important; }
#rheostat-app-container .status-open { background: #f1f5f9 !important; color: #475569 !important; border-color: #cbd5e1 !important; }
#rheostat-app-container .status-danger { background: #fee2e2 !important; color: #b91c1c !important; border-color: #fecaca !important; }

#rheostat-app-container .hud-display { width: 100% !important; padding: 15px !important; background: var(--bg-light) !important; border-radius: 8px !important; border: 1px solid var(--slate-200) !important; display: grid !important; grid-template-columns: repeat(3, 1fr) !important; gap: 10px !important; text-align: center !important; position: relative !important; }
#rheostat-app-container .hud-box { display: flex !important; flex-direction: column !important; justify-content: center !important; }
#rheostat-app-container .border-left { border-left: 1px solid var(--slate-200) !important; }
#rheostat-app-container .hud-label { font-size: 0.85rem !important; font-weight: bold !important; color: var(--slate-500) !important; margin-bottom: 5px !important; }
#rheostat-app-container .hud-label span { font-weight: normal !important; font-size: 0.75rem !important; }
#rheostat-app-container .hud-val { font-size: 1.8rem !important; font-family: monospace !important; font-weight: bold !important; line-height: 1.1 !important; }
#rheostat-app-container .text-orange { color: #d97706 !important; }
#rheostat-app-container .text-blue { color: #2563eb !important; }
#rheostat-app-container .text-rose { color: #e11d48 !important; }
#rheostat-app-container .text-red { color: #dc2626 !important; }

#rheostat-app-container .diagram-container { position: relative !important; width: 100% !important; background: #0f172a !important; border-bottom: 1px solid var(--slate-200) !important; padding: 20px !important; display: flex !important; align-items: center !important; justify-content: center !important; min-height: 350px !important; }
#rheostat-app-container .svg-canvas { width: 100% !important; height: auto !important; max-width: 600px !important; display: block !important; }
#rheostat-app-container .cursor-grab { cursor: grab !important; }
#rheostat-app-container .cursor-grabbing { cursor: grabbing !important; }

#rheostat-app-container .overlay { position: absolute !important; top: 0 !important; left: 0 !important; right: 0 !important; bottom: 0 !important; background: rgba(0,0,0,0.7) !important; z-index: 50 !important; display: flex !important; flex-direction: column !important; align-items: center !important; justify-content: center !important; backdrop-filter: blur(4px) !important; }
#rheostat-app-container .overlay-card { background: white !important; padding: 24px !important; border-radius: 12px !important; text-align: center !important; max-width: 320px !important; box-shadow: 0 10px 25px rgba(0,0,0,0.5) !important; }
#rheostat-app-container .overlay-icon { font-size: 2.5rem !important; margin-bottom: 10px !important; }
#rheostat-app-container .overlay-card h2 { font-size: 1.25rem !important; font-weight: bold !important; color: #dc2626 !important; margin-bottom: 8px !important; }
#rheostat-app-container .overlay-card h2 span { font-size: 0.9rem !important; font-weight: normal !important; }
#rheostat-app-container .overlay-card p { color: #475569 !important; font-size: 0.85rem !important; margin-bottom: 20px !important; line-height: 1.5 !important; }
#rheostat-app-container .btn-primary { background: #2563eb !important; color: white !important; font-weight: bold !important; padding: 10px 24px !important; border-radius: 8px !important; border: none !important; cursor: pointer !important; }

#rheostat-app-container .controls { padding: 25px !important; background: #fff !important; display: flex !important; flex-direction: column !important; align-items: center !important; }
#rheostat-app-container .controls-title { font-size: 0.875rem !important; font-weight: bold !important; color: var(--slate-500) !important; margin-bottom: 15px !important; }
#rheostat-app-container .controls-grid { display: grid !important; grid-template-columns: 1fr 1fr !important; gap: 20px !important; width: 100% !important; max-width: 600px !important; }
@media (max-width: 600px) { #rheostat-app-container .controls-grid { grid-template-columns: 1fr !important; } }

#rheostat-app-container .control-box { padding: 16px !important; border-radius: 8px !important; display: flex !important; flex-direction: column !important; align-items: center !important; }
#rheostat-app-container .box-red { background: #fef2f2 !important; border: 1px solid #fee2e2 !important; }
#rheostat-app-container .box-blue { background: #eff6ff !important; border: 1px solid #dbeafe !important; }
#rheostat-app-container .control-box label { font-size: 0.875rem !important; font-weight: bold !important; margin-bottom: 12px !important; display: flex !important; align-items: center !important; }
#rheostat-app-container .box-red label { color: #b91c1c !important; }
#rheostat-app-container .box-blue label { color: #1d4ed8 !important; }
#rheostat-app-container .dot { width: 12px !important; height: 12px !important; border-radius: 50% !important; margin-right: 8px !important; }
#rheostat-app-container .dot-red { background: #ef4444 !important; }
#rheostat-app-container .dot-blue { background: #3b82f6 !important; }

#rheostat-app-container .btn-group { display: flex !important; gap: 8px !important; }
#rheostat-app-container .btn-group button { padding: 8px 16px !important; border-radius: 6px !important; font-size: 0.875rem !important; font-weight: bold !important; background: white !important; color: var(--slate-500) !important; border: 1px solid var(--slate-200) !important; cursor: pointer !important; }
#rheostat-app-container .btn-group button:disabled { opacity: 0.5 !important; cursor: not-allowed !important; }
#rheostat-app-container .box-red .btn-group button.active { background: #ef4444 !important; color: white !important; border-color: #ef4444 !important; }
#rheostat-app-container .box-blue .btn-group button.active { background: #3b82f6 !important; color: white !important; border-color: #3b82f6 !important; }

#rheostat-app-container .hidden { display: none !important; }
@keyframes pulse-anim { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
#rheostat-app-container .animate-pulse { animation: pulse-anim 1.5s infinite !important; }