*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #4CAF50;--primary-dark: #388E3C;--primary-light: #C8E6C9;--secondary-color: #2196F3;--background-dark: #1a1a2e;--background-darker: #16213e;--background-card: #0f3460;--text-primary: #ffffff;--text-secondary: #b0b0b0;--accent-color: #e94560;--success-color: #4CAF50;--warning-color: #FF9800;--border-radius: 12px;--transition-fast: .2s ease;--transition-normal: .3s ease;--shadow-soft: 0 4px 20px rgba(0, 0, 0, .3);--shadow-glow: 0 0 20px rgba(76, 175, 80, .3)}body{font-family:Segoe UI,Microsoft YaHei,sans-serif;background:linear-gradient(135deg,var(--background-dark) 0%,var(--background-darker) 100%);color:var(--text-primary);min-height:100vh;overflow-x:hidden}#app{display:flex;flex-direction:column;min-height:100vh}.header{display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;background:#0f3460cc;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.1);z-index:100}.logo{display:flex;align-items:center;gap:.75rem}.logo-icon{font-size:2rem;animation:bounce 2s infinite}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}.logo h1{font-size:1.5rem;font-weight:600;background:linear-gradient(90deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.header-info{font-size:.9rem;color:var(--text-secondary)}.main-content{flex:1;display:flex;justify-content:center;align-items:center;padding:2rem;position:relative;min-height:calc(100vh - 140px)}.upload-zone{width:100%;max-width:600px;padding:3rem;background:#0f346099;border:2px dashed rgba(76,175,80,.5);border-radius:var(--border-radius);text-align:center;transition:all var(--transition-normal);cursor:pointer}.upload-zone:hover,.upload-zone.drag-over{border-color:var(--primary-color);background:#4caf501a;transform:scale(1.02);box-shadow:var(--shadow-glow)}.upload-content{display:flex;flex-direction:column;align-items:center;gap:1rem}.upload-icon{width:80px;height:80px;color:var(--primary-color);animation:float 3s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.upload-icon svg{width:100%;height:100%}.upload-zone h2{font-size:1.5rem;font-weight:500}.upload-zone p{color:var(--text-secondary)}.btn-primary{padding:.75rem 2rem;background:linear-gradient(135deg,var(--primary-color),var(--primary-dark));border:none;border-radius:25px;color:#fff;font-size:1rem;font-weight:500;cursor:pointer;transition:all var(--transition-fast);margin-top:1rem}.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-glow)}.btn-primary:active{transform:translateY(0)}.supported-formats{font-size:.8rem;color:var(--text-secondary);margin-top:1rem}.viewer-container{width:100%;height:calc(100vh - 140px);position:absolute;top:0;left:0;border-radius:var(--border-radius);overflow:hidden;background:var(--background-darker);opacity:0;visibility:hidden;transition:opacity .3s ease,visibility .3s ease;pointer-events:none}.viewer-container.visible{opacity:1;visibility:visible;pointer-events:auto}#three-canvas{width:100%;height:100%;display:block;pointer-events:auto}.loading-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:#1a1a2ef2;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:1.5rem;z-index:50;transition:opacity var(--transition-normal)}.loading-overlay.hidden{opacity:0;pointer-events:none}.loading-spinner{width:60px;height:60px;border:4px solid rgba(76,175,80,.2);border-top-color:var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}#loading-text{font-size:1.1rem;color:var(--text-secondary)}.progress-bar{width:200px;height:6px;background:#ffffff1a;border-radius:3px;overflow:hidden}.progress-fill{height:100%;width:0%;background:linear-gradient(90deg,var(--primary-color),var(--secondary-color));border-radius:3px;transition:width var(--transition-fast)}.controls-panel{position:absolute;top:1rem;left:1rem;background:#0f3460e6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:var(--border-radius);padding:1rem;display:flex;flex-direction:column;gap:1rem;z-index:10;border:1px solid rgba(255,255,255,.1);pointer-events:auto}.control-group h3{font-size:.75rem;text-transform:uppercase;color:var(--text-secondary);margin-bottom:.5rem;letter-spacing:.5px}.control-btn{width:40px;height:40px;background:#ffffff1a;border:1px solid rgba(255,255,255,.2);border-radius:8px;color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast);display:inline-flex;justify-content:center;align-items:center;margin-right:.5rem}.control-btn:last-child{margin-right:0}.control-btn:hover,.control-btn.active{background:var(--primary-color);border-color:var(--primary-color)}.control-btn svg{width:20px;height:20px}.select-input{width:100%;padding:.5rem;background:#ffffff1a;border:1px solid rgba(255,255,255,.2);border-radius:8px;color:var(--text-primary);font-size:.9rem;cursor:pointer;transition:all var(--transition-fast)}.select-input:hover{border-color:var(--primary-color)}.select-input:focus{outline:none;border-color:var(--primary-color)}.info-panel{position:absolute;top:1rem;right:1rem;background:#0f3460e6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:var(--border-radius);padding:1rem;min-width:200px;z-index:10;border:1px solid rgba(255,255,255,.1);pointer-events:auto}.info-panel h3{font-size:.9rem;margin-bottom:.75rem;padding-bottom:.5rem;border-bottom:1px solid rgba(255,255,255,.1)}.info-item{display:flex;justify-content:space-between;margin-bottom:.5rem;font-size:.85rem}.info-label{color:var(--text-secondary)}.upload-new-btn{position:absolute;bottom:1rem;right:1rem;width:50px;height:50px;background:linear-gradient(135deg,var(--primary-color),var(--primary-dark));border:none;border-radius:50%;color:#fff;cursor:pointer;transition:all var(--transition-fast);display:flex;justify-content:center;align-items:center;z-index:10;box-shadow:var(--shadow-soft);pointer-events:auto}.upload-new-btn:hover{transform:scale(1.1);box-shadow:var(--shadow-glow)}.upload-new-btn svg{width:24px;height:24px}.footer{padding:1rem 2rem;text-align:center;background:#0f346080;border-top:1px solid rgba(255,255,255,.1);font-size:.85rem;color:var(--text-secondary)}.hidden{display:none!important}@media (max-width: 768px){.header{flex-direction:column;gap:.5rem;padding:1rem}.logo h1{font-size:1.2rem}.upload-zone{padding:2rem 1rem}.upload-zone h2{font-size:1.2rem}.controls-panel{top:.5rem;left:.5rem;padding:.75rem}.info-panel{top:auto;bottom:4rem;right:.5rem;min-width:150px}.viewer-container{height:calc(100vh - 160px)}}.fade-in{animation:fadeIn .5s ease forwards}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.scale-in{animation:scaleIn .3s ease forwards}@keyframes scaleIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}