:root{--bg-primary: #0a0a0f;--bg-secondary: #12121a;--bg-tertiary: #1a1a28;--bg-card: #16162280;--bg-card-hover: #1e1e3060;--bg-card-active: #252540;--text-primary: #f0f0f5;--text-secondary: #9898b0;--text-muted: #606078;--accent-primary: #e74c3c;--accent-secondary: #f39c12;--accent-glow: rgba(231, 76, 60, .3);--border-default: rgba(255, 255, 255, .06);--border-active: rgba(231, 76, 60, .5);--border-hover: rgba(255, 255, 255, .12);--glass-bg: rgba(18, 18, 26, .85);--glass-blur: 20px;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.4, 0, .2, 1);--shadow-card: 0 4px 24px rgba(0, 0, 0, .3);--shadow-glow: 0 0 30px var(--accent-glow);--font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-display: "Outfit", "Inter", sans-serif}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-body);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;overflow-x:hidden}#app{display:flex;flex-direction:column;min-height:100vh}.header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-md) var(--space-xl);background:var(--glass-bg);-webkit-backdrop-filter:blur(var(--glass-blur));backdrop-filter:blur(var(--glass-blur));border-bottom:1px solid var(--border-default);position:sticky;top:0;z-index:100}.header-brand{display:flex;align-items:center;gap:var(--space-md)}.header-icon{font-size:1.8rem;filter:drop-shadow(0 0 8px rgba(231,76,60,.5))}.header-title{font-family:var(--font-display);font-size:1.5rem;font-weight:700;letter-spacing:-.02em}.header-accent{background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.header-tagline{color:var(--text-secondary);font-size:.875rem;font-weight:400}.main-layout{display:flex;flex:1;overflow:hidden}.options-panel{width:400px;min-width:400px;background:var(--bg-secondary);border-right:1px solid var(--border-default);overflow-y:auto;padding:var(--space-lg);display:flex;flex-direction:column;gap:var(--space-lg);scrollbar-width:thin;scrollbar-color:var(--bg-tertiary) transparent}.options-panel::-webkit-scrollbar{width:6px}.options-panel::-webkit-scrollbar-track{background:transparent}.options-panel::-webkit-scrollbar-thumb{background:var(--bg-tertiary);border-radius:3px}.option-group{display:flex;flex-direction:column;gap:var(--space-md)}.option-title{font-family:var(--font-display);font-size:.95rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.08em;display:flex;align-items:center;gap:var(--space-sm)}.option-icon{font-size:1.1rem}.option-cards{display:flex;flex-direction:column;gap:var(--space-sm)}.option-card{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md);background:var(--bg-card);border:1px solid var(--border-default);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-normal);position:relative;overflow:hidden;font-family:var(--font-body);color:var(--text-primary);text-align:left;font-size:1rem}.option-card:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(135deg,rgba(231,76,60,.08),transparent);opacity:0;transition:opacity var(--transition-normal)}.option-card:hover{border-color:var(--border-hover);background:var(--bg-card-hover);transform:translate(4px)}.option-card:hover:before{opacity:1}.option-card.active{border-color:var(--border-active);background:var(--bg-card-active);box-shadow:var(--shadow-glow)}.option-card.active:before{opacity:1}.option-card.active:after{content:"✓";position:absolute;top:8px;right:10px;font-size:.75rem;color:var(--accent-primary);font-weight:700;background:#e74c3c26;width:20px;height:20px;border-radius:50%;display:flex;align-items:center;justify-content:center}.option-card-icon{font-size:1.5rem;width:40px;text-align:center;flex-shrink:0}.option-card-info{display:flex;flex-direction:column;gap:2px;flex:1;min-width:0}.option-card-name{font-weight:600;font-size:.9rem}.option-card-desc{font-size:.75rem;color:var(--text-secondary)}.option-card-price{font-weight:700;font-size:.85rem;color:var(--accent-secondary);flex-shrink:0}.surround-grid{display:grid!important;grid-template-columns:repeat(2,1fr);gap:var(--space-sm)}.surround-card{flex-direction:column;align-items:center;text-align:center;padding:var(--space-md);gap:var(--space-sm)}.surround-swatch{width:48px;height:48px;border-radius:50%;border:3px solid rgba(255,255,255,.1);transition:all var(--transition-normal);box-shadow:0 4px 12px #0000004d}.surround-card:hover .surround-swatch{transform:scale(1.1);border-color:#fff3}.surround-card.active .surround-swatch{border-color:var(--accent-primary);box-shadow:0 0 20px #e74c3c4d}.price-summary{margin-top:auto;padding-top:var(--space-lg);border-top:1px solid var(--border-default)}.price-breakdown{display:flex;flex-direction:column;gap:var(--space-sm);margin-bottom:var(--space-lg)}.price-line{display:flex;justify-content:space-between;align-items:center;font-size:.85rem;color:var(--text-secondary)}.price-divider{height:1px;background:var(--border-default);margin:var(--space-xs) 0}.price-total{font-size:1.1rem!important;font-weight:700!important;color:var(--text-primary)!important}.price-total span:last-child{font-size:1.3rem;background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.cta-button{width:100%;padding:var(--space-md) var(--space-lg);background:linear-gradient(135deg,var(--accent-primary),#c0392b);color:#fff;border:none;border-radius:var(--radius-md);font-family:var(--font-display);font-size:1rem;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:var(--space-sm);transition:all var(--transition-normal);position:relative;overflow:hidden}.cta-button:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(135deg,transparent,rgba(255,255,255,.1));opacity:0;transition:opacity var(--transition-normal)}.cta-button:hover{transform:translateY(-2px);box-shadow:0 8px 32px #e74c3c66}.cta-button:hover:before{opacity:1}.cta-button:active{transform:translateY(0)}.cta-icon{font-size:1.2rem}.viewport-container{flex:1;display:flex;flex-direction:column;position:relative;background:var(--bg-primary);background-image:radial-gradient(circle at 50% 30%,rgba(231,76,60,.03) 0%,transparent 60%),radial-gradient(circle at 30% 70%,rgba(243,156,18,.02) 0%,transparent 50%)}.viewport-3d{flex:1;position:relative;overflow:hidden}.viewport-3d canvas{display:block;width:100%!important;height:100%!important}.viewport-controls{display:flex;justify-content:center;padding:var(--space-sm) var(--space-md);background:var(--glass-bg);-webkit-backdrop-filter:blur(var(--glass-blur));backdrop-filter:blur(var(--glass-blur));border-top:1px solid var(--border-default)}.viewport-hint{font-size:.75rem;color:var(--text-muted);letter-spacing:.02em}@media(max-width:900px){.main-layout{flex-direction:column-reverse}.options-panel{width:100%;min-width:100%;max-height:50vh;border-right:none;border-top:1px solid var(--border-default)}.viewport-container{height:50vh}.header-tagline{display:none}}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.option-group{animation:fadeIn .4s ease-out backwards}.option-group:nth-child(1){animation-delay:.1s}.option-group:nth-child(2){animation-delay:.2s}.option-group:nth-child(3){animation-delay:.3s}@keyframes pulse{0%,to{box-shadow:0 0 0 0 var(--accent-glow)}50%{box-shadow:0 0 20px 4px var(--accent-glow)}}.cta-button{animation:pulse 3s ease-in-out infinite}